{"id":3143,"date":"2026-06-24T07:52:08","date_gmt":"2026-06-24T07:52:08","guid":{"rendered":"https:\/\/koreben.com\/?p=3143"},"modified":"2026-06-24T07:52:08","modified_gmt":"2026-06-24T07:52:08","slug":"corner-radius-design-guidelines-injection-molding","status":"publish","type":"post","link":"https:\/\/koreben.com\/zh\/corner-radius-design-guidelines-injection-molding\/","title":{"rendered":"Sharp Corners Create Problems: Why Radii Matter in Injection Molded Parts"},"content":{"rendered":"<p class=\"wp-block-paragraph\">One of the most common comments during a DFM review is:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">&#8220;Can we add a radius here?&#8221;<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">To many product designers, corner radii appear to be minor details.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">After all, a sharp corner seems simpler to design and often looks cleaner in CAD.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">However, sharp corners rarely benefit injection molded parts.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In fact, they frequently create problems in:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Material flow<\/li>\n\n\n\n<li>Part strength<\/li>\n\n\n\n<li>Cooling behavior<\/li>\n\n\n\n<li>Dimensional stability<\/li>\n\n\n\n<li>Mold manufacturing<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">For mold engineers, corner radii are not cosmetic features.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">They are critical design elements that directly influence molding performance and product reliability.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading has-text-align-center\">Engineering Problem<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Sharp corners often contribute to a wide range of manufacturing and performance issues.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">Structural Problems<\/h5>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Stress concentration<\/li>\n\n\n\n<li>Crack initiation<\/li>\n\n\n\n<li>Reduced fatigue life<\/li>\n\n\n\n<li>Lower impact resistance<\/li>\n<\/ul>\n\n\n\n<h5 class=\"wp-block-heading\">Molding Problems<\/h5>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Flow hesitation<\/li>\n\n\n\n<li>Weld line formation<\/li>\n\n\n\n<li>Localized shrinkage<\/li>\n\n\n\n<li>Warpage<\/li>\n<\/ul>\n\n\n\n<h5 class=\"wp-block-heading\">Tooling Challenges<\/h5>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Difficult machining<\/li>\n\n\n\n<li>Increased EDM requirements<\/li>\n\n\n\n<li>Tool wear<\/li>\n\n\n\n<li>Longer mold build times<\/li>\n<\/ul>\n\n\n\n<h5 class=\"wp-block-heading\">Quality Issues<\/h5>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Cosmetic defects<\/li>\n\n\n\n<li>Dimensional variation<\/li>\n\n\n\n<li>Surface blemishes<\/li>\n\n\n\n<li>Reduced consistency between production lots<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Many of these problems originate from a single cause:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The corner geometry changes how material behaves during molding.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading has-text-align-center\">Root Cause: Sharp Corners Create Hidden Thick Sections<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">One of the most misunderstood aspects of corner design is wall thickness.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Many designers assume that maintaining a constant wall thickness automatically eliminates molding problems.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Unfortunately, sharp corners often create hidden material accumulation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Consider a 3 mm wall with a sharp internal corner.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">While the nominal wall thickness remains 3 mm, the material path through the corner becomes significantly thicker.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This results in:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Slower cooling<\/li>\n\n\n\n<li>Increased shrinkage<\/li>\n\n\n\n<li>Internal stress<\/li>\n\n\n\n<li>Sink risk<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The problem becomes even more severe when external radii are added without adjusting the internal corner geometry.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In these situations, wall thickness may effectively double in the corner region.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">What appears to be a simple corner often becomes a localized thick section.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading has-text-align-center\">Engineering Reference Data<\/h4>\n\n\n\n<h5 class=\"wp-block-heading\">Recommended Corner Radius Guidelines<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\">A widely accepted design guideline is:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Feature<\/th><th>Recommended Value<\/th><\/tr><\/thead><tbody><tr><td>Minimum Internal Radius<\/td><td>0.5 \u00d7 Wall Thickness<\/td><\/tr><tr><td>Preferred Internal Radius<\/td><td>0.75 \u00d7 Wall Thickness<\/td><\/tr><tr><td>Optimal Internal Radius<\/td><td>1.0 \u00d7 Wall Thickness<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Example:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For a 2.5 mm nominal wall:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Radius Type<\/th><th>Value<\/th><\/tr><\/thead><tbody><tr><td>Minimum Internal Radius<\/td><td>1.25 mm<\/td><\/tr><tr><td>Preferred Internal Radius<\/td><td>1.9 mm<\/td><\/tr><tr><td>Optimal Internal Radius<\/td><td>2.5 mm<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Larger radii generally improve flow and reduce stress concentration.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h5 class=\"wp-block-heading\">External Radius Guidelines<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\">To maintain a relatively constant wall section:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">External Radius = Internal Radius + Wall Thickness<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">Example:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Parameter<\/th><th>Value<\/th><\/tr><\/thead><tbody><tr><td>Wall Thickness<\/td><td>2.5 mm<\/td><\/tr><tr><td>Internal Radius<\/td><td>1.5 mm<\/td><\/tr><tr><td>External Radius<\/td><td>4.0 mm<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">This approach helps prevent material buildup in the corner.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h5 class=\"wp-block-heading\">Stress Reduction Benefits<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\">Studies across plastics and structural engineering consistently show that increasing corner radius significantly reduces stress concentration.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Typical trends:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Radius Increase<\/th><th>Stress Reduction<\/th><\/tr><\/thead><tbody><tr><td>Sharp Corner \u2192 0.5T Radius<\/td><td>Significant<\/td><\/tr><tr><td>0.5T \u2192 0.75T Radius<\/td><td>Moderate<\/td><\/tr><tr><td>0.75T \u2192 1.0T Radius<\/td><td>Additional Improvement<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">In impact-loaded components, corner radii often improve performance more effectively than simply increasing wall thickness.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h5 class=\"wp-block-heading\">Machining Considerations<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\">Corner geometry directly affects mold manufacturing.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Corner Type<\/th><th>Tooling Impact<\/th><\/tr><\/thead><tbody><tr><td>Sharp Internal Corner<\/td><td>Often requires EDM<\/td><\/tr><tr><td>Small Radius<\/td><td>May require small cutters<\/td><\/tr><tr><td>Generous Radius<\/td><td>Easily CNC machined<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Larger radii generally allow:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Larger cutting tools<\/li>\n\n\n\n<li>Faster machining<\/li>\n\n\n\n<li>Better surface finish<\/li>\n\n\n\n<li>Lower tooling cost<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">From a mold manufacturing perspective, generous radii are almost always preferred.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading has-text-align-center\">Why Sharp Corners Increase Stress<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Whenever a load passes through a sharp corner, stress tends to concentrate at the corner apex.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This creates a localized weak point.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For molded parts subjected to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Impact loading<\/li>\n\n\n\n<li>Vibration<\/li>\n\n\n\n<li>Repeated assembly<\/li>\n\n\n\n<li>Thermal cycling<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">sharp corners often become the first location where cracks initiate.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Adding a radius distributes the load over a larger area and reduces peak stress.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In many applications, increasing corner radius provides more benefit than increasing wall thickness.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading has-text-align-center\">Mold Engineering Perspective<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">When reviewing a part design, mold engineers rarely ask:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">&#8220;Does this corner look good?&#8221;<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">Instead, we ask:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Will material flow through this area smoothly?<\/li>\n\n\n\n<li>Will the corner cool uniformly?<\/li>\n\n\n\n<li>Will stress concentrate here?<\/li>\n\n\n\n<li>Can the mold be machined efficiently?<\/li>\n\n\n\n<li>Will the corner affect long-term durability?<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A radius solves multiple problems simultaneously.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It improves:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Material flow<\/li>\n\n\n\n<li>Cooling consistency<\/li>\n\n\n\n<li>Structural strength<\/li>\n\n\n\n<li>Mold manufacturability<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Few design changes offer as many benefits with such a small impact on part geometry.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For this reason, radii are one of the first features reviewed during DFM analysis.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading has-text-align-center\">Common Corner Design Mistakes<\/h4>\n\n\n\n<h6 class=\"wp-block-heading\">Mistake #1: Sharp Internal Corners<\/h6>\n\n\n\n<p class=\"wp-block-paragraph\">Creates stress concentration and machining difficulties.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h6 class=\"wp-block-heading\">Mistake #2: Large External Radius Only<\/h6>\n\n\n\n<p class=\"wp-block-paragraph\">Can create excessive wall thickness in the corner.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h6 class=\"wp-block-heading\">Mistake #3: Different Radii on Adjacent Features<\/h6>\n\n\n\n<p class=\"wp-block-paragraph\">May create inconsistent flow and shrinkage.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h6 class=\"wp-block-heading\">Mistake #4: Ignoring Corner Geometry in Structural Areas<\/h6>\n\n\n\n<p class=\"wp-block-paragraph\">Corners near bosses, ribs, snap fits, and mounting points often experience the highest stresses.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h6 class=\"wp-block-heading\">Mistake #5: Designing for CAD Appearance Instead of Manufacturing<\/h6>\n\n\n\n<p class=\"wp-block-paragraph\">Sharp corners often look clean on-screen but create unnecessary manufacturing challenges.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading has-text-align-center\">DFM Quick Review Checklist: Corner Design<\/h4>\n\n\n\n<h5 class=\"wp-block-heading\">1. Corner Geometry<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\">\u25a1 Have sharp internal corners been eliminated?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u25a1 Is the internal radius at least 0.5 \u00d7 wall thickness?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u25a1 Is the preferred radius 0.75 \u00d7 wall thickness or greater?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u25a1 Is wall thickness maintained through the corner?<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h5 class=\"wp-block-heading\">2. Flow and Cooling<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\">\u25a1 Can material flow smoothly through the corner?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u25a1 Is material accumulation minimized?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u25a1 Has shrinkage behavior been evaluated?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u25a1 Have localized thick sections been eliminated?<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h5 class=\"wp-block-heading\">3. Structural Integrity<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\">\u25a1 Are stress concentrations minimized?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u25a1 Will the corner experience impact loading?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u25a1 Is fatigue resistance important?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u25a1 Have crack initiation risks been evaluated?<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h5 class=\"wp-block-heading\">4. Mold Manufacturability<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\">\u25a1 Can the corner be machined with standard cutters?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u25a1 Is EDM required?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u25a1 Can larger tooling improve efficiency?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u25a1 Has mold maintenance been considered?<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h5 class=\"wp-block-heading\">5. Production Reliability<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\">\u25a1 Will the corner affect dimensional stability?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u25a1 Has warpage risk been evaluated?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u25a1 Are cosmetic defects likely?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u25a1 Is long-term durability sufficient?<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading has-text-align-center\">Final Thoughts<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Sharp corners may appear simple in CAD.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In manufacturing, they rarely are.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A properly designed radius can improve:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Material flow<\/li>\n\n\n\n<li>Cooling performance<\/li>\n\n\n\n<li>Structural strength<\/li>\n\n\n\n<li>Tooling efficiency<\/li>\n\n\n\n<li>Product durability<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">while reducing stress concentration, shrinkage issues, and machining complexity.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For injection molded parts, corner radii are not merely finishing details.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">They are one of the most effective design tools available for improving manufacturability and performance.<\/p>","protected":false},"excerpt":{"rendered":"<p>One of the most common comments during a DFM review is: &#8220;Can we add a radius here?&#8221; To many product designers, corner radii appear to be minor details. After all, a sharp corner seems simpler to design and often looks cleaner in CAD. However, sharp corners rarely benefit injection molded parts. In fact, they frequently create problems in: For mold engineers, corner radii are not cosmetic features. They are critical design elements that directly influence molding performance and product reliability. Engineering Problem Sharp corners often contribute to a wide range of manufacturing and performance issues. Structural Problems Molding Problems Tooling Challenges Quality Issues Many of these problems originate from a single cause: The corner geometry changes how material behaves during molding. Root Cause: Sharp Corners Create Hidden Thick Sections One of the most misunderstood aspects of corner design is wall thickness. Many designers assume that maintaining a constant wall thickness automatically eliminates molding problems. Unfortunately, sharp corners often create hidden material accumulation. Consider a 3 mm wall with a sharp internal corner. While the nominal wall thickness remains 3 mm, the material path through the corner becomes significantly thicker. This results in: The problem becomes even more severe when external radii are added without adjusting the internal corner geometry. In these situations, wall thickness may effectively double in the corner region. What appears to be a simple corner often becomes a localized thick section. Engineering Reference Data Recommended Corner Radius Guidelines A widely accepted design guideline is: Feature Recommended Value Minimum Internal Radius 0.5 \u00d7 Wall Thickness Preferred Internal Radius 0.75 \u00d7 Wall Thickness Optimal Internal Radius 1.0 \u00d7 Wall Thickness Example: For a 2.5 mm nominal wall: Radius Type Value Minimum Internal Radius 1.25 mm Preferred Internal Radius 1.9 mm Optimal Internal Radius 2.5 mm Larger radii generally improve flow and reduce stress concentration. External Radius Guidelines To maintain a relatively constant wall section: External Radius = Internal Radius + Wall Thickness Example: Parameter Value Wall Thickness 2.5 mm Internal Radius 1.5 mm External Radius 4.0 mm This approach helps prevent material buildup in the corner. Stress Reduction Benefits Studies across plastics and structural engineering consistently show that increasing corner radius significantly reduces stress concentration. Typical trends: Radius Increase Stress Reduction Sharp Corner \u2192 0.5T Radius Significant 0.5T \u2192 0.75T Radius Moderate 0.75T \u2192 1.0T Radius Additional Improvement In impact-loaded components, corner radii often improve performance more effectively than simply increasing wall thickness. Machining Considerations Corner geometry directly affects mold manufacturing. Corner Type Tooling Impact Sharp Internal Corner Often requires EDM Small Radius May require small cutters Generous Radius Easily CNC machined Larger radii generally allow: From a mold manufacturing perspective, generous radii are almost always preferred. Why Sharp Corners Increase Stress Whenever a load passes through a sharp corner, stress tends to concentrate at the corner apex. This creates a localized weak point. For molded parts subjected to: sharp corners often become the first location where cracks initiate. Adding a radius distributes the load over a larger area and reduces peak stress. In many applications, increasing corner radius provides more benefit than increasing wall thickness. Mold Engineering Perspective When reviewing a part design, mold engineers rarely ask: &#8220;Does this corner look good?&#8221; Instead, we ask: A radius solves multiple problems simultaneously. It improves: Few design changes offer as many benefits with such a small impact on part geometry. For this reason, radii are one of the first features reviewed during DFM analysis. Common Corner Design Mistakes Mistake #1: Sharp Internal Corners Creates stress concentration and machining difficulties. Mistake #2: Large External Radius Only Can create excessive wall thickness in the corner. Mistake #3: Different Radii on Adjacent Features May create inconsistent flow and shrinkage. Mistake #4: Ignoring Corner Geometry in Structural Areas Corners near bosses, ribs, snap fits, and mounting points often experience the highest stresses. Mistake #5: Designing for CAD Appearance Instead of Manufacturing Sharp corners often look clean on-screen but create unnecessary manufacturing challenges. DFM Quick Review Checklist: Corner Design 1. Corner Geometry \u25a1 Have sharp internal corners been eliminated? \u25a1 Is the internal radius at least 0.5 \u00d7 wall thickness? \u25a1 Is the preferred radius 0.75 \u00d7 wall thickness or greater? \u25a1 Is wall thickness maintained through the corner? 2. Flow and Cooling \u25a1 Can material flow smoothly through the corner? \u25a1 Is material accumulation minimized? \u25a1 Has shrinkage behavior been evaluated? \u25a1 Have localized thick sections been eliminated? 3. Structural Integrity \u25a1 Are stress concentrations minimized? \u25a1 Will the corner experience impact loading? \u25a1 Is fatigue resistance important? \u25a1 Have crack initiation risks been evaluated? 4. Mold Manufacturability \u25a1 Can the corner be machined with standard cutters? \u25a1 Is EDM required? \u25a1 Can larger tooling improve efficiency? \u25a1 Has mold maintenance been considered? 5. Production Reliability \u25a1 Will the corner affect dimensional stability? \u25a1 Has warpage risk been evaluated? \u25a1 Are cosmetic defects likely? \u25a1 Is long-term durability sufficient? Final Thoughts Sharp corners may appear simple in CAD. In manufacturing, they rarely are. A properly designed radius can improve: while reducing stress concentration, shrinkage issues, and machining complexity. For injection molded parts, corner radii are not merely finishing details. They are one of the most effective design tools available for improving manufacturability and performance.<\/p>","protected":false},"author":1,"featured_media":3144,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[21,23,14],"tags":[67,22,24,25,26,27,44,31,29],"class_list":["post-3143","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-advanced-molding","category-engineering-npd","category-precision-tooling","tag-corner-radius","tag-dfm","tag-injection-molding","tag-manufacturing-engineering","tag-mold-design","tag-plastic-part-design","tag-product-development","tag-production-tooling","tag-tooling-engineering"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/koreben.com\/zh\/wp-json\/wp\/v2\/posts\/3143","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/koreben.com\/zh\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/koreben.com\/zh\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/koreben.com\/zh\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/koreben.com\/zh\/wp-json\/wp\/v2\/comments?post=3143"}],"version-history":[{"count":0,"href":"https:\/\/koreben.com\/zh\/wp-json\/wp\/v2\/posts\/3143\/revisions"}],"wp:attachment":[{"href":"https:\/\/koreben.com\/zh\/wp-json\/wp\/v2\/media?parent=3143"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/koreben.com\/zh\/wp-json\/wp\/v2\/categories?post=3143"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/koreben.com\/zh\/wp-json\/wp\/v2\/tags?post=3143"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}