Metal Bending Springback & Compensation Angle Calculator<\/title>\n <style>\n \/* Google Fonts *\/\n @import url('https:\/\/fonts.googleapis.com\/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');\n \n \/* ========== Scoped Calculator Styles ========== *\/\n #springback-calculator {\n font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;\n line-height: 1.5;\n box-sizing: border-box;\n padding: 32px 16px;\n background-color: #ffffff;\n }\n \n #springback-calculator *,\n #springback-calculator *::before,\n #springback-calculator *::after {\n box-sizing: border-box;\n margin: 0;\n padding: 0;\n }\n\n #springback-calculator .sb-container {\n max-width: 560px;\n margin: 0 auto;\n }\n\n #springback-calculator .sb-title {\n font-size: 1.5rem;\n font-weight: 700;\n color: #1f2937;\n margin-bottom: 24px;\n text-align: left;\n }\n\n #springback-calculator .sb-card {\n background-color: #ffffff;\n border-radius: 16px;\n padding: 24px;\n box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1), 0 2px 10px rgba(0, 0, 0, 0.06);\n }\n\n \/* Unit Toggle *\/\n #springback-calculator .sb-unit-toggle-wrapper {\n display: flex;\n justify-content: flex-end;\n margin-bottom: 24px;\n }\n\n #springback-calculator .sb-unit-toggle {\n display: flex;\n align-items: center;\n background-color: #f3f4f6;\n border-radius: 8px;\n padding: 4px;\n }\n\n #springback-calculator .sb-unit-btn {\n padding: 6px 12px;\n font-size: 14px;\n font-weight: 500;\n border: none;\n border-radius: 6px;\n cursor: pointer;\n transition: all 0.2s ease;\n background-color: transparent;\n color: #6b7280;\n }\n\n #springback-calculator .sb-unit-btn:hover {\n color: #374151;\n }\n\n #springback-calculator .sb-unit-btn.active {\n background-color: #3b82f6;\n color: #ffffff;\n }\n\n \/* Form Elements *\/\n #springback-calculator .sb-form-group {\n margin-bottom: 20px;\n }\n\n #springback-calculator .sb-label {\n display: block;\n font-size: 14px;\n font-weight: 500;\n color: #374151;\n margin-bottom: 8px;\n }\n\n #springback-calculator .sb-select {\n width: 100%;\n padding: 12px 16px;\n font-size: 14px;\n font-family: inherit;\n color: #1f2937;\n background-color: #ffffff;\n border: 1px solid #d1d5db;\n border-radius: 8px;\n cursor: pointer;\n transition: border-color 0.2s ease, box-shadow 0.2s ease;\n appearance: auto;\n }\n\n #springback-calculator .sb-select:focus {\n outline: none;\n border-color: #3b82f6;\n box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);\n }\n\n #springback-calculator .sb-input-wrapper {\n position: relative;\n }\n\n #springback-calculator .sb-input {\n width: 100%;\n padding: 12px 16px;\n padding-right: 40px;\n font-size: 14px;\n font-family: 'JetBrains Mono', monospace;\n color: #1f2937;\n background-color: #ffffff;\n border: 1px solid #d1d5db;\n border-radius: 8px;\n transition: border-color 0.2s ease, box-shadow 0.2s ease;\n -moz-appearance: textfield;\n }\n\n #springback-calculator .sb-input::-webkit-outer-spin-button,\n #springback-calculator .sb-input::-webkit-inner-spin-button {\n -webkit-appearance: none;\n margin: 0;\n }\n\n #springback-calculator .sb-input:focus {\n outline: none;\n border-color: #3b82f6;\n box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);\n }\n\n #springback-calculator .sb-input-unit {\n position: absolute;\n right: 16px;\n top: 50%;\n transform: translateY(-50%);\n font-size: 14px;\n color: #9ca3af;\n pointer-events: none;\n }\n\n #springback-calculator .sb-material-info {\n display: none;\n align-items: center;\n margin-top: 8px;\n font-size: 12px;\n color: #6b7280;\n }\n\n #springback-calculator .sb-material-info.visible {\n display: flex;\n }\n\n #springback-calculator .sb-material-dot {\n width: 8px;\n height: 8px;\n background-color: #22c55e;\n border-radius: 50%;\n margin-right: 8px;\n }\n\n #springback-calculator .sb-k-factor {\n font-family: 'JetBrains Mono', monospace;\n color: #3b82f6;\n font-weight: 500;\n margin-left: 4px;\n }\n\n \/* R\/T Ratio *\/\n #springback-calculator .sb-ratio-row {\n display: flex;\n align-items: center;\n justify-content: space-between;\n margin-top: 8px;\n font-size: 12px;\n }\n\n #springback-calculator .sb-ratio-text {\n color: #6b7280;\n }\n\n #springback-calculator .sb-ratio-value {\n font-family: 'JetBrains Mono', monospace;\n color: #3b82f6;\n font-weight: 500;\n }\n\n #springback-calculator .sb-ratio-warning {\n display: none;\n align-items: center;\n color: #f59e0b;\n font-weight: 500;\n }\n\n #springback-calculator .sb-ratio-warning.visible {\n display: flex;\n }\n\n #springback-calculator .sb-ratio-warning svg {\n width: 16px;\n height: 16px;\n margin-right: 4px;\n }\n\n \/* Quick Angle Buttons *\/\n #springback-calculator .sb-angle-buttons {\n display: flex;\n flex-wrap: wrap;\n gap: 8px;\n margin-top: 12px;\n }\n\n #springback-calculator .sb-angle-btn {\n padding: 4px 12px;\n font-size: 12px;\n font-weight: 500;\n color: #4b5563;\n background-color: #f3f4f6;\n border: none;\n border-radius: 6px;\n cursor: pointer;\n transition: all 0.2s ease;\n }\n\n #springback-calculator .sb-angle-btn:hover {\n background-color: #e5e7eb;\n }\n\n #springback-calculator .sb-angle-btn.active {\n background-color: #3b82f6;\n color: #ffffff;\n }\n\n \/* Calculate Button *\/\n #springback-calculator .sb-calc-btn-wrapper {\n display: flex;\n justify-content: center;\n margin-top: 24px;\n }\n\n #springback-calculator .sb-calc-btn {\n width: 33.333%;\n padding: 12px 24px;\n font-size: 14px;\n font-weight: 600;\n color: #ffffff;\n background-color: #3b82f6;\n border: none;\n border-radius: 8px;\n cursor: pointer;\n transition: all 0.2s ease;\n box-shadow: 0 4px 6px rgba(59, 130, 246, 0.25);\n }\n\n #springback-calculator .sb-calc-btn:hover {\n background-color: #2563eb;\n }\n\n #springback-calculator .sb-calc-btn:active {\n transform: scale(0.98);\n }\n\n \/* Results Section *\/\n #springback-calculator .sb-results {\n display: none;\n margin-top: 32px;\n padding-top: 24px;\n border-top: 1px solid #e5e7eb;\n }\n\n #springback-calculator .sb-results.visible {\n display: block;\n animation: sbFadeIn 0.3s ease-out;\n }\n\n @keyframes sbFadeIn {\n from {\n opacity: 0;\n transform: translateY(-10px);\n }\n to {\n opacity: 1;\n transform: translateY(0);\n }\n }\n\n \/* Warning Alert *\/\n #springback-calculator .sb-warning {\n display: none;\n margin-bottom: 16px;\n padding: 16px;\n background-color: #fffbeb;\n border: 1px solid #fde68a;\n border-radius: 12px;\n animation: sbPulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;\n }\n\n #springback-calculator .sb-warning.visible {\n display: block;\n }\n\n @keyframes sbPulse {\n 0%, 100% { opacity: 1; }\n 50% { opacity: 0.7; }\n }\n\n #springback-calculator .sb-warning-content {\n display: flex;\n align-items: flex-start;\n }\n\n #springback-calculator .sb-warning-icon {\n width: 20px;\n height: 20px;\n color: #f59e0b;\n margin-right: 12px;\n flex-shrink: 0;\n margin-top: 2px;\n }\n\n #springback-calculator .sb-warning-title {\n font-size: 14px;\n font-weight: 600;\n color: #b45309;\n margin-bottom: 4px;\n }\n\n #springback-calculator .sb-warning-text {\n font-size: 14px;\n color: #d97706;\n }\n\n \/* Result Cards *\/\n #springback-calculator .sb-result-cards {\n display: flex;\n flex-direction: column;\n gap: 16px;\n }\n\n #springback-calculator .sb-result-card {\n padding: 16px;\n border-radius: 12px;\n }\n\n #springback-calculator .sb-result-card.blue {\n background-color: #eff6ff;\n border: 1px solid #dbeafe;\n }\n\n #springback-calculator .sb-result-card.green {\n background-color: #f0fdf4;\n border: 1px solid #dcfce7;\n }\n\n #springback-calculator .sb-result-card-content {\n display: flex;\n align-items: center;\n justify-content: space-between;\n }\n\n #springback-calculator .sb-result-label {\n font-size: 14px;\n color: #6b7280;\n margin-bottom: 4px;\n }\n\n #springback-calculator .sb-result-value {\n font-size: 1.5rem;\n font-weight: 700;\n font-family: 'JetBrains Mono', monospace;\n }\n\n #springback-calculator .sb-result-card.blue .sb-result-value {\n color: #1f2937;\n }\n\n #springback-calculator .sb-result-card.green .sb-result-value {\n color: #16a34a;\n }\n\n #springback-calculator .sb-result-icon {\n width: 48px;\n height: 48px;\n border-radius: 12px;\n display: flex;\n align-items: center;\n justify-content: center;\n }\n\n #springback-calculator .sb-result-card.blue .sb-result-icon {\n background-color: #dbeafe;\n }\n\n #springback-calculator .sb-result-card.green .sb-result-icon {\n background-color: #dcfce7;\n }\n\n #springback-calculator .sb-result-icon svg {\n width: 24px;\n height: 24px;\n }\n\n #springback-calculator .sb-result-card.blue .sb-result-icon svg {\n color: #3b82f6;\n }\n\n #springback-calculator .sb-result-card.green .sb-result-icon svg {\n color: #22c55e;\n }\n\n #springback-calculator .sb-result-formula {\n font-size: 12px;\n font-family: 'JetBrains Mono', monospace;\n color: #9ca3af;\n margin-top: 8px;\n }\n\n \/* Additional Info Grid *\/\n #springback-calculator .sb-info-grid {\n display: grid;\n grid-template-columns: 1fr 1fr;\n gap: 16px;\n margin-top: 16px;\n }\n\n #springback-calculator .sb-info-card {\n padding: 16px;\n background-color: #f9fafb;\n border: 1px solid #f3f4f6;\n border-radius: 12px;\n }\n\n #springback-calculator .sb-info-label {\n font-size: 12px;\n color: #6b7280;\n margin-bottom: 4px;\n }\n\n #springback-calculator .sb-info-value {\n font-size: 1.125rem;\n font-weight: 600;\n font-family: 'JetBrains Mono', monospace;\n color: #1f2937;\n }\n\n #springback-calculator .sb-info-unit {\n font-size: 14px;\n color: #9ca3af;\n font-weight: 400;\n }\n\n \/* Responsive *\/\n @media (max-width: 480px) {\n #springback-calculator .sb-card {\n padding: 16px;\n }\n\n #springback-calculator .sb-calc-btn {\n width: 50%;\n }\n\n #springback-calculator .sb-info-grid {\n grid-template-columns: 1fr;\n }\n }\n <\/style>\n<\/head>\n<body>\n \n <div id=\"springback-calculator\">\n <div class=\"sb-container\">\n \n <h2 class=\"sb-title\">Calculator<\/h2>\n \n \n <div class=\"sb-card\">\n \n <div class=\"sb-unit-toggle-wrapper\">\n <div class=\"sb-unit-toggle\">\n <button type=\"button\" id=\"sb-metricBtn\" class=\"sb-unit-btn active\" onclick=\"sbSetUnit('metric')\">\n Metric (mm)\n <\/button>\n <button type=\"button\" id=\"sb-imperialBtn\" class=\"sb-unit-btn\" onclick=\"sbSetUnit('imperial')\">\n Imperial (in)\n <\/button>\n <\/div>\n <\/div>\n\n \n <div class=\"sb-form\">\n \n <div class=\"sb-form-group\">\n <label class=\"sb-label\">Material Type<\/label>\n <select id=\"sb-material\" class=\"sb-select\" onchange=\"sbUpdateMaterialInfo()\">\n <option value=\"\" disabled selected>Select material type<\/option>\n <option value=\"mild_steel\">Mild Steel (AISI 1010-1025)<\/option>\n <option value=\"stainless_steel\">Stainless Steel (304\/316)<\/option>\n <option value=\"aluminum\">Aluminum (6061-T6)<\/option>\n <option value=\"copper\">Copper (C11000)<\/option>\n <option value=\"brass\">Brass (C26000)<\/option>\n <\/select>\n <div id=\"sb-materialInfo\" class=\"sb-material-info\">\n <span class=\"sb-material-dot\"><\/span>\n K-factor: <span id=\"sb-kFactorDisplay\" class=\"sb-k-factor\">—<\/span>\n <\/div>\n <\/div>\n\n \n <div class=\"sb-form-group\">\n <label class=\"sb-label\">Material Thickness (<span id=\"sb-thicknessUnit\">mm<\/span>)<\/label>\n <div class=\"sb-input-wrapper\">\n <input type=\"number\" id=\"sb-thickness\" class=\"sb-input\" min=\"0.1\" step=\"0.1\" placeholder=\"Enter thickness\">\n <span class=\"sb-input-unit\" id=\"sb-thicknessUnitLabel\">mm<\/span>\n <\/div>\n <\/div>\n\n \n <div class=\"sb-form-group\">\n <label class=\"sb-label\">Internal Bend Radius (<span id=\"sb-radiusUnit\">mm<\/span>)<\/label>\n <div class=\"sb-input-wrapper\">\n <input type=\"number\" id=\"sb-radius\" class=\"sb-input\" min=\"0.1\" step=\"0.1\" placeholder=\"Enter bend radius\">\n <span class=\"sb-input-unit\" id=\"sb-radiusUnitLabel\">mm<\/span>\n <\/div>\n <div class=\"sb-ratio-row\">\n <span class=\"sb-ratio-text\">R\/T Ratio: <span id=\"sb-rtRatio\" class=\"sb-ratio-value\">—<\/span><\/span>\n <span id=\"sb-rtWarning\" class=\"sb-ratio-warning\">\n <svg fill=\"currentColor\" viewBox=\"0 0 20 20\">\n <path fill-rule=\"evenodd\" d=\"M8.257 3.099c.765-1.36 2.722-1.36 3.486 0l5.58 9.92c.75 1.334-.213 2.98-1.742 2.98H4.42c-1.53 0-2.493-1.646-1.743-2.98l5.58-9.92zM11 13a1 1 0 11-2 0 1 1 0 012 0zm-1-8a1 1 0 00-1 1v3a1 1 0 002 0V6a1 1 0 00-1-1z\" clip-rule=\"evenodd\"\/>\n <\/svg>\n High R\/T\n <\/span>\n <\/div>\n <\/div>\n\n \n <div class=\"sb-form-group\">\n <label class=\"sb-label\">Desired Final Angle (\u00b0)<\/label>\n <div class=\"sb-input-wrapper\">\n <input type=\"number\" id=\"sb-finalAngle\" class=\"sb-input\" min=\"1\" max=\"180\" step=\"0.5\" placeholder=\"Enter desired angle\">\n <span class=\"sb-input-unit\">\u00b0<\/span>\n <\/div>\n <div class=\"sb-angle-buttons\">\n <button type=\"button\" class=\"sb-angle-btn\" onclick=\"sbSetAngle(30)\">30\u00b0<\/button>\n <button type=\"button\" class=\"sb-angle-btn\" onclick=\"sbSetAngle(45)\">45\u00b0<\/button>\n <button type=\"button\" class=\"sb-angle-btn\" onclick=\"sbSetAngle(60)\">60\u00b0<\/button>\n <button type=\"button\" class=\"sb-angle-btn\" onclick=\"sbSetAngle(90)\">90\u00b0<\/button>\n <button type=\"button\" class=\"sb-angle-btn\" onclick=\"sbSetAngle(120)\">120\u00b0<\/button>\n <button type=\"button\" class=\"sb-angle-btn\" onclick=\"sbSetAngle(135)\">135\u00b0<\/button>\n <\/div>\n <\/div>\n\n \n <div class=\"sb-calc-btn-wrapper\">\n <button type=\"button\" class=\"sb-calc-btn\" onclick=\"sbCalculate()\">Calculate<\/button>\n <\/div>\n <\/div>\n\n \n <div id=\"sb-resultsSection\" class=\"sb-results\">\n \n <div id=\"sb-warningAlert\" class=\"sb-warning\">\n <div class=\"sb-warning-content\">\n <svg class=\"sb-warning-icon\" fill=\"currentColor\" viewBox=\"0 0 20 20\">\n <path fill-rule=\"evenodd\" d=\"M8.257 3.099c.765-1.36 2.722-1.36 3.486 0l5.58 9.92c.75 1.334-.213 2.98-1.742 2.98H4.42c-1.53 0-2.493-1.646-1.743-2.98l5.58-9.92zM11 13a1 1 0 11-2 0 1 1 0 012 0zm-1-8a1 1 0 00-1 1v3a1 1 0 002 0V6a1 1 0 00-1-1z\" clip-rule=\"evenodd\"\/>\n <\/svg>\n <div>\n <div class=\"sb-warning-title\">High Springback Risk Detected<\/div>\n <div class=\"sb-warning-text\" id=\"sb-warningText\">\n R\/T ratio exceeds 6. Consider using a smaller bend radius or thicker material.\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n\n \n <div class=\"sb-result-cards\">\n \n <div class=\"sb-result-card blue\">\n <div class=\"sb-result-card-content\">\n <div>\n <div class=\"sb-result-label\">Estimated Springback Angle<\/div>\n <div class=\"sb-result-value\"><span id=\"sb-springbackAngle\">0.00<\/span>\u00b0<\/div>\n <\/div>\n <div class=\"sb-result-icon\">\n <svg fill=\"none\" stroke=\"currentColor\" viewBox=\"0 0 24 24\">\n <path stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M4 4v5h.582m15.356 2A8.001 8.001 0 004.582 9m0 0H9m11 11v-5h-.581m0 0a8.003 8.003 0 01-15.357-2m15.357 2H15\"\/>\n <\/svg>\n <\/div>\n <\/div>\n <div class=\"sb-result-formula\">\u0394\u03b8 = \u03b8 \u00d7 (1 – K)<\/div>\n <\/div>\n\n \n <div class=\"sb-result-card green\">\n <div class=\"sb-result-card-content\">\n <div>\n <div class=\"sb-result-label\">Required Punch Angle (Compensated)<\/div>\n <div class=\"sb-result-value\"><span id=\"sb-compensatedAngle\">0.00<\/span>\u00b0<\/div>\n <\/div>\n <div class=\"sb-result-icon\">\n <svg fill=\"none\" stroke=\"currentColor\" viewBox=\"0 0 24 24\">\n <path stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M9 12l2 2 4-4m6 2a9 9 0 11-18 0 9 9 0 0118 0z\"\/>\n <\/svg>\n <\/div>\n <\/div>\n <div class=\"sb-result-formula\">Over-bend to this angle for accurate final result<\/div>\n <\/div>\n <\/div>\n\n \n <div class=\"sb-info-grid\">\n <div class=\"sb-info-card\">\n <div class=\"sb-info-label\">Springback Factor (K)<\/div>\n <div class=\"sb-info-value\" id=\"sb-springbackFactor\">0.000<\/div>\n <\/div>\n <div class=\"sb-info-card\">\n <div class=\"sb-info-label\">Bend Allowance<\/div>\n <div class=\"sb-info-value\">\n <span id=\"sb-bendAllowance\">0.00<\/span>\n <span class=\"sb-info-unit\" id=\"sb-baUnit\">mm<\/span>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n\n <script>\n \/\/ Springback Calculator - Namespaced to avoid conflicts\n (function() {\n 'use strict';\n\n \/\/ Material properties with K-factors\n const sbMaterials = {\n mild_steel: { name: 'Mild Steel', kFactor: 0.33, springbackCoeff: 0.03 },\n stainless_steel: { name: 'Stainless Steel', kFactor: 0.45, springbackCoeff: 0.05 },\n aluminum: { name: 'Aluminum', kFactor: 0.38, springbackCoeff: 0.04 },\n copper: { name: 'Copper', kFactor: 0.35, springbackCoeff: 0.025 },\n brass: { name: 'Brass', kFactor: 0.37, springbackCoeff: 0.035 }\n };\n\n \/\/ Current unit system\n let sbCurrentUnit = 'metric';\n const sbMmToInch = 0.0393701;\n const sbInchToMm = 25.4;\n\n \/\/ Update R\/T ratio display\n function sbUpdateRtRatio() {\n const thickness = parseFloat(document.getElementById('sb-thickness').value) || 0;\n const radius = parseFloat(document.getElementById('sb-radius').value) || 0;\n \n let thicknessMm = thickness;\n let radiusMm = radius;\n if (sbCurrentUnit === 'imperial') {\n thicknessMm = thickness * sbInchToMm;\n radiusMm = radius * sbInchToMm;\n }\n \n const rtRatioEl = document.getElementById('sb-rtRatio');\n const rtWarningEl = document.getElementById('sb-rtWarning');\n \n if (thicknessMm > 0 && radiusMm > 0) {\n const rtRatio = radiusMm \/ thicknessMm;\n rtRatioEl.textContent = rtRatio.toFixed(2);\n \n if (rtRatio > 4) {\n rtWarningEl.classList.add('visible');\n } else {\n rtWarningEl.classList.remove('visible');\n }\n } else {\n rtRatioEl.textContent = '--';\n rtWarningEl.classList.remove('visible');\n }\n }\n\n \/\/ Set unit system\n window.sbSetUnit = function(unit) {\n const metricBtn = document.getElementById('sb-metricBtn');\n const imperialBtn = document.getElementById('sb-imperialBtn');\n const thicknessInput = document.getElementById('sb-thickness');\n const radiusInput = document.getElementById('sb-radius');\n \n let thickness = parseFloat(thicknessInput.value) || 0;\n let radius = parseFloat(radiusInput.value) || 0;\n \n if (sbCurrentUnit === 'metric' && unit === 'imperial') {\n if (thickness > 0) thickness = (thickness * sbMmToInch).toFixed(3);\n if (radius > 0) radius = (radius * sbMmToInch).toFixed(3);\n } else if (sbCurrentUnit === 'imperial' && unit === 'metric') {\n if (thickness > 0) thickness = (thickness * sbInchToMm).toFixed(2);\n if (radius > 0) radius = (radius * sbInchToMm).toFixed(2);\n }\n \n sbCurrentUnit = unit;\n \n if (unit === 'metric') {\n metricBtn.classList.add('active');\n imperialBtn.classList.remove('active');\n document.getElementById('sb-thicknessUnit').textContent = 'mm';\n document.getElementById('sb-thicknessUnitLabel').textContent = 'mm';\n document.getElementById('sb-radiusUnit').textContent = 'mm';\n document.getElementById('sb-radiusUnitLabel').textContent = 'mm';\n document.getElementById('sb-baUnit').textContent = 'mm';\n } else {\n imperialBtn.classList.add('active');\n metricBtn.classList.remove('active');\n document.getElementById('sb-thicknessUnit').textContent = 'in';\n document.getElementById('sb-thicknessUnitLabel').textContent = 'in';\n document.getElementById('sb-radiusUnit').textContent = 'in';\n document.getElementById('sb-radiusUnitLabel').textContent = 'in';\n document.getElementById('sb-baUnit').textContent = 'in';\n }\n \n if (thickness > 0) thicknessInput.value = thickness;\n if (radius > 0) radiusInput.value = radius;\n \n sbUpdateRtRatio();\n };\n\n \/\/ Update material info display\n window.sbUpdateMaterialInfo = function() {\n const materialSelect = document.getElementById('sb-material');\n const materialInfo = document.getElementById('sb-materialInfo');\n const kFactorDisplay = document.getElementById('sb-kFactorDisplay');\n \n if (materialSelect.value && sbMaterials[materialSelect.value]) {\n const material = sbMaterials[materialSelect.value];\n kFactorDisplay.textContent = material.kFactor.toFixed(2);\n materialInfo.classList.add('visible');\n } else {\n materialInfo.classList.remove('visible');\n }\n };\n\n \/\/ Set quick angle\n window.sbSetAngle = function(angle) {\n document.getElementById('sb-finalAngle').value = angle;\n \n const buttons = document.querySelectorAll('#springback-calculator .sb-angle-btn');\n buttons.forEach(btn => {\n if (btn.textContent.trim() === angle + '\u00b0') {\n btn.classList.add('active');\n } else {\n btn.classList.remove('active');\n }\n });\n };\n\n \/\/ Main calculation function\n window.sbCalculate = function() {\n const materialKey = document.getElementById('sb-material').value;\n const thickness = parseFloat(document.getElementById('sb-thickness').value) || 0;\n const radius = parseFloat(document.getElementById('sb-radius').value) || 0;\n const finalAngle = parseFloat(document.getElementById('sb-finalAngle').value) || 0;\n \n \/\/ Validate material selection\n if (!materialKey || !sbMaterials[materialKey]) {\n alert('Please select a material type.');\n return;\n }\n \n const material = sbMaterials[materialKey];\n \n \/\/ Convert to mm for calculations\n let thicknessMm = thickness;\n let radiusMm = radius;\n if (sbCurrentUnit === 'imperial') {\n thicknessMm = thickness * sbInchToMm;\n radiusMm = radius * sbInchToMm;\n }\n \n \/\/ Validate inputs\n if (thicknessMm <= 0 || radiusMm <= 0 || finalAngle <= 0) {\n alert('Please enter valid values for all fields.');\n return;\n }\n \n \/\/ Calculate R\/T ratio\n const rtRatio = radiusMm \/ thicknessMm;\n document.getElementById('sb-rtRatio').textContent = rtRatio.toFixed(2);\n \n \/\/ Check for high R\/T warning\n const rtWarningEl = document.getElementById('sb-rtWarning');\n const warningAlertEl = document.getElementById('sb-warningAlert');\n \n if (rtRatio > 6) {\n rtWarningEl.classList.add('visible');\n warningAlertEl.classList.add('visible');\n document.getElementById('sb-warningText').textContent = \n 'R\/T ratio of ' + rtRatio.toFixed(1) + ' exceeds recommended maximum of 6. Consider using a smaller bend radius or thicker material for more predictable results.';\n } else if (rtRatio > 4) {\n rtWarningEl.classList.add('visible');\n warningAlertEl.classList.remove('visible');\n } else {\n rtWarningEl.classList.remove('visible');\n warningAlertEl.classList.remove('visible');\n }\n \n \/\/ Calculate springback factor K\n const K = 1 - (material.springbackCoeff * rtRatio);\n const clampedK = Math.max(0.8, Math.min(K, 0.99));\n \n \/\/ Calculate springback angle: \u0394\u03b8 = \u03b8 \u00d7 (1 - K)\n const springbackAngle = finalAngle * (1 - clampedK);\n \n \/\/ Calculate compensated (punch) angle\n const compensatedAngle = finalAngle - springbackAngle;\n \n \/\/ Calculate bend allowance: BA = \u03c0 \u00d7 (R + K \u00d7 T) \u00d7 \u03b8 \/ 180\n const neutralAxisRadius = radiusMm + (material.kFactor * thicknessMm);\n let bendAllowance = (Math.PI * neutralAxisRadius * finalAngle) \/ 180;\n \n if (sbCurrentUnit === 'imperial') {\n bendAllowance = bendAllowance * sbMmToInch;\n }\n \n \/\/ Update results display\n document.getElementById('sb-springbackAngle').textContent = springbackAngle.toFixed(2);\n document.getElementById('sb-compensatedAngle').textContent = compensatedAngle.toFixed(2);\n document.getElementById('sb-springbackFactor').textContent = clampedK.toFixed(3);\n document.getElementById('sb-bendAllowance').textContent = bendAllowance.toFixed(2);\n \n \/\/ Show results section\n document.getElementById('sb-resultsSection').classList.add('visible');\n \n \/\/ Scroll to results\n document.getElementById('sb-resultsSection').scrollIntoView({ behavior: 'smooth', block: 'nearest' });\n };\n\n \/\/ Add input event listeners\n document.getElementById('sb-thickness').addEventListener('input', sbUpdateRtRatio);\n document.getElementById('sb-radius').addEventListener('input', sbUpdateRtRatio);\n })();\n <\/script>\n<\/body>\n<\/html>\n\n","protected":false},"excerpt":{"rendered":"<p>The Metal Bending Springback Calculator is an essential engineering tool designed to accurately predict the springback angle that occurs after metal bending. During the bending…<\/p>","protected":false},"author":2,"featured_media":24337,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"pmpro_default_level":"","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[8413],"tags":[8424,287,8481,8482],"class_list":["post-24336","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-unit-and-industry-standard-conversion","tag-metal-bending","tag-press-brake","tag-sheet-forming","tag-springback-calculator","pmpro-has-access"],"acf":[],"jetpack_featured_media_url":"https:\/\/www.mechstream.com\/wp-content\/uploads\/2026\/02\/Metal-Bending-Springback-Calculator.png","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.mechstream.com\/es\/wp-json\/wp\/v2\/posts\/24336","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.mechstream.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.mechstream.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.mechstream.com\/es\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.mechstream.com\/es\/wp-json\/wp\/v2\/comments?post=24336"}],"version-history":[{"count":0,"href":"https:\/\/www.mechstream.com\/es\/wp-json\/wp\/v2\/posts\/24336\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.mechstream.com\/es\/wp-json\/wp\/v2\/media\/24337"}],"wp:attachment":[{"href":"https:\/\/www.mechstream.com\/es\/wp-json\/wp\/v2\/media?parent=24336"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.mechstream.com\/es\/wp-json\/wp\/v2\/categories?post=24336"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.mechstream.com\/es\/wp-json\/wp\/v2\/tags?post=24336"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}

{"id":24336,"date":"2026-02-13T01:22:20","date_gmt":"2026-02-13T01:22:20","guid":{"rendered":"https:\/\/www.mechstream.com\/?p=24336"},"modified":"2026-02-13T01:27:58","modified_gmt":"2026-02-13T01:27:58","slug":"metal-bending-springback-calculator","status":"publish","type":"post","link":"https:\/\/www.mechstream.com\/es\/metal-bending-springback-calculator\/","title":{"rendered":"Metal Bending\u00a0Springback Calculator"},"content":{"rendered":"\n

The Metal Bending Springback Calculator<\/strong> is an essential engineering tool designed to accurately predict the springback angle that occurs after metal bending. During the bending process, materials such as mild steel, stainless steel, and aluminum tend to elastically recover once the forming force is removed, resulting in deviations from the intended angle. A professional Metal Bending Springback Calculator helps engineers, fabricators, and press brake operators estimate compensation values based on material properties, thickness, bending radius, and elastic modulus. By calculating springback in advance, manufacturers can improve bending accuracy, reduce trial-and-error adjustments, minimize material waste, and ensure consistent production quality. This tool is especially valuable in sheet metal fabrication, CNC press brake operations, and precision forming applications where dimensional control is critical.<\/p>\n\n\n\n\n\n\n \n \n \n Metal Bending Springback & Compensation Angle Calculator<\/title>\n <style>\n \/* Google Fonts *\/\n @import url('https:\/\/fonts.googleapis.com\/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');\n \n \/* ========== Scoped Calculator Styles ========== *\/\n #springback-calculator {\n font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;\n line-height: 1.5;\n box-sizing: border-box;\n padding: 32px 16px;\n background-color: #ffffff;\n }\n \n #springback-calculator *,\n #springback-calculator *::before,\n #springback-calculator *::after {\n box-sizing: border-box;\n margin: 0;\n padding: 0;\n }\n\n #springback-calculator .sb-container {\n max-width: 560px;\n margin: 0 auto;\n }\n\n #springback-calculator .sb-title {\n font-size: 1.5rem;\n font-weight: 700;\n color: #1f2937;\n margin-bottom: 24px;\n text-align: left;\n }\n\n #springback-calculator .sb-card {\n background-color: #ffffff;\n border-radius: 16px;\n padding: 24px;\n box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1), 0 2px 10px rgba(0, 0, 0, 0.06);\n }\n\n \/* Unit Toggle *\/\n #springback-calculator .sb-unit-toggle-wrapper {\n display: flex;\n justify-content: flex-end;\n margin-bottom: 24px;\n }\n\n #springback-calculator .sb-unit-toggle {\n display: flex;\n align-items: center;\n background-color: #f3f4f6;\n border-radius: 8px;\n padding: 4px;\n }\n\n #springback-calculator .sb-unit-btn {\n padding: 6px 12px;\n font-size: 14px;\n font-weight: 500;\n border: none;\n border-radius: 6px;\n cursor: pointer;\n transition: all 0.2s ease;\n background-color: transparent;\n color: #6b7280;\n }\n\n #springback-calculator .sb-unit-btn:hover {\n color: #374151;\n }\n\n #springback-calculator .sb-unit-btn.active {\n background-color: #3b82f6;\n color: #ffffff;\n }\n\n \/* Form Elements *\/\n #springback-calculator .sb-form-group {\n margin-bottom: 20px;\n }\n\n #springback-calculator .sb-label {\n display: block;\n font-size: 14px;\n font-weight: 500;\n color: #374151;\n margin-bottom: 8px;\n }\n\n #springback-calculator .sb-select {\n width: 100%;\n padding: 12px 16px;\n font-size: 14px;\n font-family: inherit;\n color: #1f2937;\n background-color: #ffffff;\n border: 1px solid #d1d5db;\n border-radius: 8px;\n cursor: pointer;\n transition: border-color 0.2s ease, box-shadow 0.2s ease;\n appearance: auto;\n }\n\n #springback-calculator .sb-select:focus {\n outline: none;\n border-color: #3b82f6;\n box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);\n }\n\n #springback-calculator .sb-input-wrapper {\n position: relative;\n }\n\n #springback-calculator .sb-input {\n width: 100%;\n padding: 12px 16px;\n padding-right: 40px;\n font-size: 14px;\n font-family: 'JetBrains Mono', monospace;\n color: #1f2937;\n background-color: #ffffff;\n border: 1px solid #d1d5db;\n border-radius: 8px;\n transition: border-color 0.2s ease, box-shadow 0.2s ease;\n -moz-appearance: textfield;\n }\n\n #springback-calculator .sb-input::-webkit-outer-spin-button,\n #springback-calculator .sb-input::-webkit-inner-spin-button {\n -webkit-appearance: none;\n margin: 0;\n }\n\n #springback-calculator .sb-input:focus {\n outline: none;\n border-color: #3b82f6;\n box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);\n }\n\n #springback-calculator .sb-input-unit {\n position: absolute;\n right: 16px;\n top: 50%;\n transform: translateY(-50%);\n font-size: 14px;\n color: #9ca3af;\n pointer-events: none;\n }\n\n #springback-calculator .sb-material-info {\n display: none;\n align-items: center;\n margin-top: 8px;\n font-size: 12px;\n color: #6b7280;\n }\n\n #springback-calculator .sb-material-info.visible {\n display: flex;\n }\n\n #springback-calculator .sb-material-dot {\n width: 8px;\n height: 8px;\n background-color: #22c55e;\n border-radius: 50%;\n margin-right: 8px;\n }\n\n #springback-calculator .sb-k-factor {\n font-family: 'JetBrains Mono', monospace;\n color: #3b82f6;\n font-weight: 500;\n margin-left: 4px;\n }\n\n \/* R\/T Ratio *\/\n #springback-calculator .sb-ratio-row {\n display: flex;\n align-items: center;\n justify-content: space-between;\n margin-top: 8px;\n font-size: 12px;\n }\n\n #springback-calculator .sb-ratio-text {\n color: #6b7280;\n }\n\n #springback-calculator .sb-ratio-value {\n font-family: 'JetBrains Mono', monospace;\n color: #3b82f6;\n font-weight: 500;\n }\n\n #springback-calculator .sb-ratio-warning {\n display: none;\n align-items: center;\n color: #f59e0b;\n font-weight: 500;\n }\n\n #springback-calculator .sb-ratio-warning.visible {\n display: flex;\n }\n\n #springback-calculator .sb-ratio-warning svg {\n width: 16px;\n height: 16px;\n margin-right: 4px;\n }\n\n \/* Quick Angle Buttons *\/\n #springback-calculator .sb-angle-buttons {\n display: flex;\n flex-wrap: wrap;\n gap: 8px;\n margin-top: 12px;\n }\n\n #springback-calculator .sb-angle-btn {\n padding: 4px 12px;\n font-size: 12px;\n font-weight: 500;\n color: #4b5563;\n background-color: #f3f4f6;\n border: none;\n border-radius: 6px;\n cursor: pointer;\n transition: all 0.2s ease;\n }\n\n #springback-calculator .sb-angle-btn:hover {\n background-color: #e5e7eb;\n }\n\n #springback-calculator .sb-angle-btn.active {\n background-color: #3b82f6;\n color: #ffffff;\n }\n\n \/* Calculate Button *\/\n #springback-calculator .sb-calc-btn-wrapper {\n display: flex;\n justify-content: center;\n margin-top: 24px;\n }\n\n #springback-calculator .sb-calc-btn {\n width: 33.333%;\n padding: 12px 24px;\n font-size: 14px;\n font-weight: 600;\n color: #ffffff;\n background-color: #3b82f6;\n border: none;\n border-radius: 8px;\n cursor: pointer;\n transition: all 0.2s ease;\n box-shadow: 0 4px 6px rgba(59, 130, 246, 0.25);\n }\n\n #springback-calculator .sb-calc-btn:hover {\n background-color: #2563eb;\n }\n\n #springback-calculator .sb-calc-btn:active {\n transform: scale(0.98);\n }\n\n \/* Results Section *\/\n #springback-calculator .sb-results {\n display: none;\n margin-top: 32px;\n padding-top: 24px;\n border-top: 1px solid #e5e7eb;\n }\n\n #springback-calculator .sb-results.visible {\n display: block;\n animation: sbFadeIn 0.3s ease-out;\n }\n\n @keyframes sbFadeIn {\n from {\n opacity: 0;\n transform: translateY(-10px);\n }\n to {\n opacity: 1;\n transform: translateY(0);\n }\n }\n\n \/* Warning Alert *\/\n #springback-calculator .sb-warning {\n display: none;\n margin-bottom: 16px;\n padding: 16px;\n background-color: #fffbeb;\n border: 1px solid #fde68a;\n border-radius: 12px;\n animation: sbPulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;\n }\n\n #springback-calculator .sb-warning.visible {\n display: block;\n }\n\n @keyframes sbPulse {\n 0%, 100% { opacity: 1; }\n 50% { opacity: 0.7; }\n }\n\n #springback-calculator .sb-warning-content {\n display: flex;\n align-items: flex-start;\n }\n\n #springback-calculator .sb-warning-icon {\n width: 20px;\n height: 20px;\n color: #f59e0b;\n margin-right: 12px;\n flex-shrink: 0;\n margin-top: 2px;\n }\n\n #springback-calculator .sb-warning-title {\n font-size: 14px;\n font-weight: 600;\n color: #b45309;\n margin-bottom: 4px;\n }\n\n #springback-calculator .sb-warning-text {\n font-size: 14px;\n color: #d97706;\n }\n\n \/* Result Cards *\/\n #springback-calculator .sb-result-cards {\n display: flex;\n flex-direction: column;\n gap: 16px;\n }\n\n #springback-calculator .sb-result-card {\n padding: 16px;\n border-radius: 12px;\n }\n\n #springback-calculator .sb-result-card.blue {\n background-color: #eff6ff;\n border: 1px solid #dbeafe;\n }\n\n #springback-calculator .sb-result-card.green {\n background-color: #f0fdf4;\n border: 1px solid #dcfce7;\n }\n\n #springback-calculator .sb-result-card-content {\n display: flex;\n align-items: center;\n justify-content: space-between;\n }\n\n #springback-calculator .sb-result-label {\n font-size: 14px;\n color: #6b7280;\n margin-bottom: 4px;\n }\n\n #springback-calculator .sb-result-value {\n font-size: 1.5rem;\n font-weight: 700;\n font-family: 'JetBrains Mono', monospace;\n }\n\n #springback-calculator .sb-result-card.blue .sb-result-value {\n color: #1f2937;\n }\n\n #springback-calculator .sb-result-card.green .sb-result-value {\n color: #16a34a;\n }\n\n #springback-calculator .sb-result-icon {\n width: 48px;\n height: 48px;\n border-radius: 12px;\n display: flex;\n align-items: center;\n justify-content: center;\n }\n\n #springback-calculator .sb-result-card.blue .sb-result-icon {\n background-color: #dbeafe;\n }\n\n #springback-calculator .sb-result-card.green .sb-result-icon {\n background-color: #dcfce7;\n }\n\n #springback-calculator .sb-result-icon svg {\n width: 24px;\n height: 24px;\n }\n\n #springback-calculator .sb-result-card.blue .sb-result-icon svg {\n color: #3b82f6;\n }\n\n #springback-calculator .sb-result-card.green .sb-result-icon svg {\n color: #22c55e;\n }\n\n #springback-calculator .sb-result-formula {\n font-size: 12px;\n font-family: 'JetBrains Mono', monospace;\n color: #9ca3af;\n margin-top: 8px;\n }\n\n \/* Additional Info Grid *\/\n #springback-calculator .sb-info-grid {\n display: grid;\n grid-template-columns: 1fr 1fr;\n gap: 16px;\n margin-top: 16px;\n }\n\n #springback-calculator .sb-info-card {\n padding: 16px;\n background-color: #f9fafb;\n border: 1px solid #f3f4f6;\n border-radius: 12px;\n }\n\n #springback-calculator .sb-info-label {\n font-size: 12px;\n color: #6b7280;\n margin-bottom: 4px;\n }\n\n #springback-calculator .sb-info-value {\n font-size: 1.125rem;\n font-weight: 600;\n font-family: 'JetBrains Mono', monospace;\n color: #1f2937;\n }\n\n #springback-calculator .sb-info-unit {\n font-size: 14px;\n color: #9ca3af;\n font-weight: 400;\n }\n\n \/* Responsive *\/\n @media (max-width: 480px) {\n #springback-calculator .sb-card {\n padding: 16px;\n }\n\n #springback-calculator .sb-calc-btn {\n width: 50%;\n }\n\n #springback-calculator .sb-info-grid {\n grid-template-columns: 1fr;\n }\n }\n <\/style>\n<\/head>\n<body>\n \n <div id=\"springback-calculator\">\n <div class=\"sb-container\">\n \n <h2 class=\"sb-title\">Calculator<\/h2>\n \n \n <div class=\"sb-card\">\n \n <div class=\"sb-unit-toggle-wrapper\">\n <div class=\"sb-unit-toggle\">\n <button type=\"button\" id=\"sb-metricBtn\" class=\"sb-unit-btn active\" onclick=\"sbSetUnit('metric')\">\n Metric (mm)\n <\/button>\n <button type=\"button\" id=\"sb-imperialBtn\" class=\"sb-unit-btn\" onclick=\"sbSetUnit('imperial')\">\n Imperial (in)\n <\/button>\n <\/div>\n <\/div>\n\n \n <div class=\"sb-form\">\n \n <div class=\"sb-form-group\">\n <label class=\"sb-label\">Material Type<\/label>\n <select id=\"sb-material\" class=\"sb-select\" onchange=\"sbUpdateMaterialInfo()\">\n <option value=\"\" disabled selected>Select material type<\/option>\n <option value=\"mild_steel\">Mild Steel (AISI 1010-1025)<\/option>\n <option value=\"stainless_steel\">Stainless Steel (304\/316)<\/option>\n <option value=\"aluminum\">Aluminum (6061-T6)<\/option>\n <option value=\"copper\">Copper (C11000)<\/option>\n <option value=\"brass\">Brass (C26000)<\/option>\n <\/select>\n <div id=\"sb-materialInfo\" class=\"sb-material-info\">\n <span class=\"sb-material-dot\"><\/span>\n K-factor: <span id=\"sb-kFactorDisplay\" class=\"sb-k-factor\">—<\/span>\n <\/div>\n <\/div>\n\n \n <div class=\"sb-form-group\">\n <label class=\"sb-label\">Material Thickness (<span id=\"sb-thicknessUnit\">mm<\/span>)<\/label>\n <div class=\"sb-input-wrapper\">\n <input type=\"number\" id=\"sb-thickness\" class=\"sb-input\" min=\"0.1\" step=\"0.1\" placeholder=\"Enter thickness\">\n <span class=\"sb-input-unit\" id=\"sb-thicknessUnitLabel\">mm<\/span>\n <\/div>\n <\/div>\n\n \n <div class=\"sb-form-group\">\n <label class=\"sb-label\">Internal Bend Radius (<span id=\"sb-radiusUnit\">mm<\/span>)<\/label>\n <div class=\"sb-input-wrapper\">\n <input type=\"number\" id=\"sb-radius\" class=\"sb-input\" min=\"0.1\" step=\"0.1\" placeholder=\"Enter bend radius\">\n <span class=\"sb-input-unit\" id=\"sb-radiusUnitLabel\">mm<\/span>\n <\/div>\n <div class=\"sb-ratio-row\">\n <span class=\"sb-ratio-text\">R\/T Ratio: <span id=\"sb-rtRatio\" class=\"sb-ratio-value\">—<\/span><\/span>\n <span id=\"sb-rtWarning\" class=\"sb-ratio-warning\">\n <svg fill=\"currentColor\" viewBox=\"0 0 20 20\">\n <path fill-rule=\"evenodd\" d=\"M8.257 3.099c.765-1.36 2.722-1.36 3.486 0l5.58 9.92c.75 1.334-.213 2.98-1.742 2.98H4.42c-1.53 0-2.493-1.646-1.743-2.98l5.58-9.92zM11 13a1 1 0 11-2 0 1 1 0 012 0zm-1-8a1 1 0 00-1 1v3a1 1 0 002 0V6a1 1 0 00-1-1z\" clip-rule=\"evenodd\"\/>\n <\/svg>\n High R\/T\n <\/span>\n <\/div>\n <\/div>\n\n \n <div class=\"sb-form-group\">\n <label class=\"sb-label\">Desired Final Angle (\u00b0)<\/label>\n <div class=\"sb-input-wrapper\">\n <input type=\"number\" id=\"sb-finalAngle\" class=\"sb-input\" min=\"1\" max=\"180\" step=\"0.5\" placeholder=\"Enter desired angle\">\n <span class=\"sb-input-unit\">\u00b0<\/span>\n <\/div>\n <div class=\"sb-angle-buttons\">\n <button type=\"button\" class=\"sb-angle-btn\" onclick=\"sbSetAngle(30)\">30\u00b0<\/button>\n <button type=\"button\" class=\"sb-angle-btn\" onclick=\"sbSetAngle(45)\">45\u00b0<\/button>\n <button type=\"button\" class=\"sb-angle-btn\" onclick=\"sbSetAngle(60)\">60\u00b0<\/button>\n <button type=\"button\" class=\"sb-angle-btn\" onclick=\"sbSetAngle(90)\">90\u00b0<\/button>\n <button type=\"button\" class=\"sb-angle-btn\" onclick=\"sbSetAngle(120)\">120\u00b0<\/button>\n <button type=\"button\" class=\"sb-angle-btn\" onclick=\"sbSetAngle(135)\">135\u00b0<\/button>\n <\/div>\n <\/div>\n\n \n <div class=\"sb-calc-btn-wrapper\">\n <button type=\"button\" class=\"sb-calc-btn\" onclick=\"sbCalculate()\">Calculate<\/button>\n <\/div>\n <\/div>\n\n \n <div id=\"sb-resultsSection\" class=\"sb-results\">\n \n <div id=\"sb-warningAlert\" class=\"sb-warning\">\n <div class=\"sb-warning-content\">\n <svg class=\"sb-warning-icon\" fill=\"currentColor\" viewBox=\"0 0 20 20\">\n <path fill-rule=\"evenodd\" d=\"M8.257 3.099c.765-1.36 2.722-1.36 3.486 0l5.58 9.92c.75 1.334-.213 2.98-1.742 2.98H4.42c-1.53 0-2.493-1.646-1.743-2.98l5.58-9.92zM11 13a1 1 0 11-2 0 1 1 0 012 0zm-1-8a1 1 0 00-1 1v3a1 1 0 002 0V6a1 1 0 00-1-1z\" clip-rule=\"evenodd\"\/>\n <\/svg>\n <div>\n <div class=\"sb-warning-title\">High Springback Risk Detected<\/div>\n <div class=\"sb-warning-text\" id=\"sb-warningText\">\n R\/T ratio exceeds 6. Consider using a smaller bend radius or thicker material.\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n\n \n <div class=\"sb-result-cards\">\n \n <div class=\"sb-result-card blue\">\n <div class=\"sb-result-card-content\">\n <div>\n <div class=\"sb-result-label\">Estimated Springback Angle<\/div>\n <div class=\"sb-result-value\"><span id=\"sb-springbackAngle\">0.00<\/span>\u00b0<\/div>\n <\/div>\n <div class=\"sb-result-icon\">\n <svg fill=\"none\" stroke=\"currentColor\" viewBox=\"0 0 24 24\">\n <path stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M4 4v5h.582m15.356 2A8.001 8.001 0 004.582 9m0 0H9m11 11v-5h-.581m0 0a8.003 8.003 0 01-15.357-2m15.357 2H15\"\/>\n <\/svg>\n <\/div>\n <\/div>\n <div class=\"sb-result-formula\">\u0394\u03b8 = \u03b8 \u00d7 (1 – K)<\/div>\n <\/div>\n\n \n <div class=\"sb-result-card green\">\n <div class=\"sb-result-card-content\">\n <div>\n <div class=\"sb-result-label\">Required Punch Angle (Compensated)<\/div>\n <div class=\"sb-result-value\"><span id=\"sb-compensatedAngle\">0.00<\/span>\u00b0<\/div>\n <\/div>\n <div class=\"sb-result-icon\">\n <svg fill=\"none\" stroke=\"currentColor\" viewBox=\"0 0 24 24\">\n <path stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M9 12l2 2 4-4m6 2a9 9 0 11-18 0 9 9 0 0118 0z\"\/>\n <\/svg>\n <\/div>\n <\/div>\n <div class=\"sb-result-formula\">Over-bend to this angle for accurate final result<\/div>\n <\/div>\n <\/div>\n\n \n <div class=\"sb-info-grid\">\n <div class=\"sb-info-card\">\n <div class=\"sb-info-label\">Springback Factor (K)<\/div>\n <div class=\"sb-info-value\" id=\"sb-springbackFactor\">0.000<\/div>\n <\/div>\n <div class=\"sb-info-card\">\n <div class=\"sb-info-label\">Bend Allowance<\/div>\n <div class=\"sb-info-value\">\n <span id=\"sb-bendAllowance\">0.00<\/span>\n <span class=\"sb-info-unit\" id=\"sb-baUnit\">mm<\/span>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n\n <script>\n \/\/ Springback Calculator - Namespaced to avoid conflicts\n (function() {\n 'use strict';\n\n \/\/ Material properties with K-factors\n const sbMaterials = {\n mild_steel: { name: 'Mild Steel', kFactor: 0.33, springbackCoeff: 0.03 },\n stainless_steel: { name: 'Stainless Steel', kFactor: 0.45, springbackCoeff: 0.05 },\n aluminum: { name: 'Aluminum', kFactor: 0.38, springbackCoeff: 0.04 },\n copper: { name: 'Copper', kFactor: 0.35, springbackCoeff: 0.025 },\n brass: { name: 'Brass', kFactor: 0.37, springbackCoeff: 0.035 }\n };\n\n \/\/ Current unit system\n let sbCurrentUnit = 'metric';\n const sbMmToInch = 0.0393701;\n const sbInchToMm = 25.4;\n\n \/\/ Update R\/T ratio display\n function sbUpdateRtRatio() {\n const thickness = parseFloat(document.getElementById('sb-thickness').value) || 0;\n const radius = parseFloat(document.getElementById('sb-radius').value) || 0;\n \n let thicknessMm = thickness;\n let radiusMm = radius;\n if (sbCurrentUnit === 'imperial') {\n thicknessMm = thickness * sbInchToMm;\n radiusMm = radius * sbInchToMm;\n }\n \n const rtRatioEl = document.getElementById('sb-rtRatio');\n const rtWarningEl = document.getElementById('sb-rtWarning');\n \n if (thicknessMm > 0 && radiusMm > 0) {\n const rtRatio = radiusMm \/ thicknessMm;\n rtRatioEl.textContent = rtRatio.toFixed(2);\n \n if (rtRatio > 4) {\n rtWarningEl.classList.add('visible');\n } else {\n rtWarningEl.classList.remove('visible');\n }\n } else {\n rtRatioEl.textContent = '--';\n rtWarningEl.classList.remove('visible');\n }\n }\n\n \/\/ Set unit system\n window.sbSetUnit = function(unit) {\n const metricBtn = document.getElementById('sb-metricBtn');\n const imperialBtn = document.getElementById('sb-imperialBtn');\n const thicknessInput = document.getElementById('sb-thickness');\n const radiusInput = document.getElementById('sb-radius');\n \n let thickness = parseFloat(thicknessInput.value) || 0;\n let radius = parseFloat(radiusInput.value) || 0;\n \n if (sbCurrentUnit === 'metric' && unit === 'imperial') {\n if (thickness > 0) thickness = (thickness * sbMmToInch).toFixed(3);\n if (radius > 0) radius = (radius * sbMmToInch).toFixed(3);\n } else if (sbCurrentUnit === 'imperial' && unit === 'metric') {\n if (thickness > 0) thickness = (thickness * sbInchToMm).toFixed(2);\n if (radius > 0) radius = (radius * sbInchToMm).toFixed(2);\n }\n \n sbCurrentUnit = unit;\n \n if (unit === 'metric') {\n metricBtn.classList.add('active');\n imperialBtn.classList.remove('active');\n document.getElementById('sb-thicknessUnit').textContent = 'mm';\n document.getElementById('sb-thicknessUnitLabel').textContent = 'mm';\n document.getElementById('sb-radiusUnit').textContent = 'mm';\n document.getElementById('sb-radiusUnitLabel').textContent = 'mm';\n document.getElementById('sb-baUnit').textContent = 'mm';\n } else {\n imperialBtn.classList.add('active');\n metricBtn.classList.remove('active');\n document.getElementById('sb-thicknessUnit').textContent = 'in';\n document.getElementById('sb-thicknessUnitLabel').textContent = 'in';\n document.getElementById('sb-radiusUnit').textContent = 'in';\n document.getElementById('sb-radiusUnitLabel').textContent = 'in';\n document.getElementById('sb-baUnit').textContent = 'in';\n }\n \n if (thickness > 0) thicknessInput.value = thickness;\n if (radius > 0) radiusInput.value = radius;\n \n sbUpdateRtRatio();\n };\n\n \/\/ Update material info display\n window.sbUpdateMaterialInfo = function() {\n const materialSelect = document.getElementById('sb-material');\n const materialInfo = document.getElementById('sb-materialInfo');\n const kFactorDisplay = document.getElementById('sb-kFactorDisplay');\n \n if (materialSelect.value && sbMaterials[materialSelect.value]) {\n const material = sbMaterials[materialSelect.value];\n kFactorDisplay.textContent = material.kFactor.toFixed(2);\n materialInfo.classList.add('visible');\n } else {\n materialInfo.classList.remove('visible');\n }\n };\n\n \/\/ Set quick angle\n window.sbSetAngle = function(angle) {\n document.getElementById('sb-finalAngle').value = angle;\n \n const buttons = document.querySelectorAll('#springback-calculator .sb-angle-btn');\n buttons.forEach(btn => {\n if (btn.textContent.trim() === angle + '\u00b0') {\n btn.classList.add('active');\n } else {\n btn.classList.remove('active');\n }\n });\n };\n\n \/\/ Main calculation function\n window.sbCalculate = function() {\n const materialKey = document.getElementById('sb-material').value;\n const thickness = parseFloat(document.getElementById('sb-thickness').value) || 0;\n const radius = parseFloat(document.getElementById('sb-radius').value) || 0;\n const finalAngle = parseFloat(document.getElementById('sb-finalAngle').value) || 0;\n \n \/\/ Validate material selection\n if (!materialKey || !sbMaterials[materialKey]) {\n alert('Please select a material type.');\n return;\n }\n \n const material = sbMaterials[materialKey];\n \n \/\/ Convert to mm for calculations\n let thicknessMm = thickness;\n let radiusMm = radius;\n if (sbCurrentUnit === 'imperial') {\n thicknessMm = thickness * sbInchToMm;\n radiusMm = radius * sbInchToMm;\n }\n \n \/\/ Validate inputs\n if (thicknessMm <= 0 || radiusMm <= 0 || finalAngle <= 0) {\n alert('Please enter valid values for all fields.');\n return;\n }\n \n \/\/ Calculate R\/T ratio\n const rtRatio = radiusMm \/ thicknessMm;\n document.getElementById('sb-rtRatio').textContent = rtRatio.toFixed(2);\n \n \/\/ Check for high R\/T warning\n const rtWarningEl = document.getElementById('sb-rtWarning');\n const warningAlertEl = document.getElementById('sb-warningAlert');\n \n if (rtRatio > 6) {\n rtWarningEl.classList.add('visible');\n warningAlertEl.classList.add('visible');\n document.getElementById('sb-warningText').textContent = \n 'R\/T ratio of ' + rtRatio.toFixed(1) + ' exceeds recommended maximum of 6. Consider using a smaller bend radius or thicker material for more predictable results.';\n } else if (rtRatio > 4) {\n rtWarningEl.classList.add('visible');\n warningAlertEl.classList.remove('visible');\n } else {\n rtWarningEl.classList.remove('visible');\n warningAlertEl.classList.remove('visible');\n }\n \n \/\/ Calculate springback factor K\n const K = 1 - (material.springbackCoeff * rtRatio);\n const clampedK = Math.max(0.8, Math.min(K, 0.99));\n \n \/\/ Calculate springback angle: \u0394\u03b8 = \u03b8 \u00d7 (1 - K)\n const springbackAngle = finalAngle * (1 - clampedK);\n \n \/\/ Calculate compensated (punch) angle\n const compensatedAngle = finalAngle - springbackAngle;\n \n \/\/ Calculate bend allowance: BA = \u03c0 \u00d7 (R + K \u00d7 T) \u00d7 \u03b8 \/ 180\n const neutralAxisRadius = radiusMm + (material.kFactor * thicknessMm);\n let bendAllowance = (Math.PI * neutralAxisRadius * finalAngle) \/ 180;\n \n if (sbCurrentUnit === 'imperial') {\n bendAllowance = bendAllowance * sbMmToInch;\n }\n \n \/\/ Update results display\n document.getElementById('sb-springbackAngle').textContent = springbackAngle.toFixed(2);\n document.getElementById('sb-compensatedAngle').textContent = compensatedAngle.toFixed(2);\n document.getElementById('sb-springbackFactor').textContent = clampedK.toFixed(3);\n document.getElementById('sb-bendAllowance').textContent = bendAllowance.toFixed(2);\n \n \/\/ Show results section\n document.getElementById('sb-resultsSection').classList.add('visible');\n \n \/\/ Scroll to results\n document.getElementById('sb-resultsSection').scrollIntoView({ behavior: 'smooth', block: 'nearest' });\n };\n\n \/\/ Add input event listeners\n document.getElementById('sb-thickness').addEventListener('input', sbUpdateRtRatio);\n document.getElementById('sb-radius').addEventListener('input', sbUpdateRtRatio);\n })();\n <\/script>\n<\/body>\n<\/html>\n\n","protected":false},"excerpt":{"rendered":"<p>The Metal Bending Springback Calculator is an essential engineering tool designed to accurately predict the springback angle that occurs after metal bending. During the bending…<\/p>","protected":false},"author":2,"featured_media":24337,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"pmpro_default_level":"","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[8413],"tags":[8424,287,8481,8482],"class_list":["post-24336","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-unit-and-industry-standard-conversion","tag-metal-bending","tag-press-brake","tag-sheet-forming","tag-springback-calculator","pmpro-has-access"],"acf":[],"jetpack_featured_media_url":"https:\/\/www.mechstream.com\/wp-content\/uploads\/2026\/02\/Metal-Bending-Springback-Calculator.png","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.mechstream.com\/es\/wp-json\/wp\/v2\/posts\/24336","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.mechstream.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.mechstream.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.mechstream.com\/es\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.mechstream.com\/es\/wp-json\/wp\/v2\/comments?post=24336"}],"version-history":[{"count":0,"href":"https:\/\/www.mechstream.com\/es\/wp-json\/wp\/v2\/posts\/24336\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.mechstream.com\/es\/wp-json\/wp\/v2\/media\/24337"}],"wp:attachment":[{"href":"https:\/\/www.mechstream.com\/es\/wp-json\/wp\/v2\/media?parent=24336"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.mechstream.com\/es\/wp-json\/wp\/v2\/categories?post=24336"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.mechstream.com\/es\/wp-json\/wp\/v2\/tags?post=24336"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}