{"id":53737,"date":"2026-05-06T20:00:00","date_gmt":"2026-05-06T12:00:00","guid":{"rendered":"https:\/\/zetarmold.com\/?p=53737"},"modified":"2026-05-06T12:00:54","modified_gmt":"2026-05-06T04:00:54","slug":"%e3%82%a2%e3%83%b3%e3%83%80%e3%83%bc%e3%82%ab%e3%83%83%e3%83%88%e8%a8%ad%e8%a8%88%e5%b0%84%e5%87%ba%e6%88%90%e5%bd%a2","status":"publish","type":"post","link":"https:\/\/zetarmold.com\/ja\/%e3%82%a2%e3%83%b3%e3%83%80%e3%83%bc%e3%82%ab%e3%83%83%e3%83%88%e8%a8%ad%e8%a8%88%e5%b0%84%e5%87%ba%e6%88%90%e5%bd%a2\/","title":{"rendered":"\u5c04\u51fa\u6210\u5f62\u306b\u304a\u3051\u308b\u30a2\u30f3\u30c0\u30fc\u30ab\u30c3\u30c8\u8a2d\u8a08\u306e\u89e3\u6c7a\u7b56"},"content":{"rendered":"<div class=\"callout-key\" style=\"background:#f0f7ff; border-left:4px solid #2563eb; padding:1em 1.2em; border-radius:6px; margin:1.5em 0;\">\n<strong>\u8981\u70b9<\/strong><\/p>\n<ul>\n<li>Side actions, unscrews, lifters, and collapsible cores handle undercuts<\/li>\n<li>Undercut depth-to-diameter ratio determines which method works best<\/li>\n<li>Collapsible cores handle deeper undercuts than side actions<\/li>\n<li>Side pullers increase tooling cost by 15\u201320% per undercut feature<\/li>\n<li>DFM review before tooling prevents expensive design revisions<\/li>\n<\/ul>\n<\/div>\n<div class=\"claim claim-true\" style=\"background-color: #eff7ef; border-color: #eff7ef; color: #5a8a5a;\">\n<p><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20\" height=\"20\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"#16a34a\" stroke-width=\"2\"><path d=\"M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z\"\/><\/svg><b>&#8220;Side actions handle undercuts up to 6 mm deep effectively and cost less than unscrewing mechanisms.&#8221;<\/b><span class=\"claim-true-or-false\">\u771f<\/span><\/p>\n<p class=\"claim-explanation\"><a href=\"https:\/\/zetarmold.com\/ja\/%e3%82%b5%e3%82%a4%e3%83%89%e3%82%a2%e3%82%af%e3%82%b7%e3%83%a7%e3%83%b3%e3%83%aa%e3%83%95%e3%82%bf%e3%83%bc%e3%81%a8%e6%8a%98%e3%82%8a%e3%81%9f%e3%81%9f%e3%81%bf%e5%bc%8f%e3%82%b3%e3%82%a2\/\">undercuts<\/a><sup id=\"fnref1:1\"><a href=\"#fn:1\" class=\"footnote-ref\">1<\/a><\/sup> use angle pins or side cores that pull perpendicular to mold opening direction. They are suitable for shallow external undercuts on part surfaces where mold design provides perpendicular access. Deeper than 6 mm causes pin deflection or insufficient ejection force.<\/p>\n<\/div>\n<div class=\"claim claim-false\" style=\"background-color: #f7e8e8; border-color: #f7e8e8; color: #8a4a4a;\">\n<p><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20\" height=\"20\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"#dc2626\" stroke-width=\"2\"><line x1=\"18\" y1=\"6\" x2=\"6\" y2=\"18\"\/><line x1=\"6\" y1=\"6\" x2=\"18\" y2=\"18\"\/><\/svg><b>&#8220;Unscrewing mechanisms are always required for threaded features.&#8221;<\/b><span class=\"claim-true-or-false\">\u507d<\/span><\/p>\n<p class=\"claim-explanation\">In reality, external threads on small parts with shallow thread depth can sometimes be stripped during ejection without unscrewing. However, most threaded features including internal threads, long threads, and bottle caps require unscrewing mechanisms because threaded cores trap parts during normal ejection.<\/p>\n<\/div>\n<p>Understanding undercut mechanisms is essential for anyone involved in <a href=\"https:\/\/zetarmold.com\/ja\/injection-molding-complete-guide\/\">\u5c04\u51fa\u6210\u5f62<\/a>\u2014these design choices directly affect tooling cost, cycle time, and part quality. Each undercut type\u2014side action, unscrewing, collapsible core, and lifter\u2014addresses specific undercut geometries in <a href=\"https:\/\/zetarmold.com\/ja\/injection-mold-complete-guide\/\">\u5c04\u51fa\u6210\u5f62\u91d1\u578b<\/a> design and depth requirements. Selecting the right mechanism during the design phase prevents expensive tooling revisions and ensures reliable production throughout the product lifecycle. The following sections detail each mechanism type with specific design guidelines and cost implications.<\/p>\n<div class=\"claim claim-true\" style=\"background-color: #eff7ef; border-color: #eff7ef; color: #5a8a5a;\">\n<p><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20\" height=\"20\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"#16a34a\" stroke-width=\"2\"><path d=\"M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z\"\/><\/svg><b>&#8220;<a href=\"https:\/\/zetarmold.com\/ja\/%e3%82%b5%e3%82%a4%e3%83%89%e3%82%a2%e3%82%af%e3%82%b7%e3%83%a7%e3%83%b3%e3%83%aa%e3%83%95%e3%82%bf%e3%83%bc%e3%81%a8%e6%8a%98%e3%82%8a%e3%81%9f%e3%81%9f%e3%81%bf%e5%bc%8f%e3%82%b3%e3%82%a2\/\">collapsible cores<\/a><sup id=\"fnref1:2\"><a href=\"#fn:2\" class=\"footnote-ref\">2<\/a><\/sup> handle deeper internal undercuts than side actions or lifters.&#8221;<\/b><span class=\"claim-true-or-false\">\u771f<\/span><\/p>\n<p class=\"claim-explanation\">Collapsible cores use segmented core sections that collapse inward during ejection. They handle internal undercuts up to 20 mm deep and are preferred for complex internal geometries like internal snap-fits where side access is blocked by part geometry.<\/p>\n<\/div>\n<div class=\"claim claim-false\" style=\"background-color: #f7e8e8; border-color: #f7e8e8; color: #8a4a4a;\">\n<p><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20\" height=\"20\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"#dc2626\" stroke-width=\"2\"><line x1=\"18\" y1=\"6\" x2=\"6\" y2=\"18\"\/><line x1=\"6\" y1=\"6\" x2=\"18\" y2=\"18\"\/><\/svg><b>&#8220;Adding more undercuts to a part always increases cost linearly.&#8221;<\/b><span class=\"claim-true-or-false\">\u507d<\/span><\/p>\n<p class=\"claim-explanation\">In reality, multiple undercuts increase tooling complexity multiplicatively. Two simple undercuts cost approximately 50% more than one undercut. Three or more undercuts require multiple mold actions, increasing tooling cost by 100-200% compared to undercut-free designs.<\/p>\n<\/div>\n<figure style=\"text-align:center;margin:2em 0;\">\n<img fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"457\" src=\"https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/04\/c7266e1f-ae85-42e7-a213-ef8cfc54f57f-800x457-1.jpg\" class=\"wp-image-53244\" alt=\"\u5c04\u51fa\u6210\u5f62\u306b\u304a\u3051\u308b\u30a2\u30f3\u30c0\u30fc\u30ab\u30c3\u30c8\u306e\u4f8b\" style=\"max-width:100%;height:auto;\" srcset=\"https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/04\/c7266e1f-ae85-42e7-a213-ef8cfc54f57f-800x457-1.jpg 800w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/04\/c7266e1f-ae85-42e7-a213-ef8cfc54f57f-800x457-1-300x171.jpg 300w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/04\/c7266e1f-ae85-42e7-a213-ef8cfc54f57f-800x457-1-768x439.jpg 768w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/04\/c7266e1f-ae85-42e7-a213-ef8cfc54f57f-800x457-1-18x10.jpg 18w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/04\/c7266e1f-ae85-42e7-a213-ef8cfc54f57f-800x457-1-600x343.jpg 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption style=\"font-size:0.78em; color:#888; font-style:italic; margin-top:4px; text-align:center;\">Undercut examples<\/figcaption><\/figure>\n<h2>What Are Undercuts in Injection Molding?<\/h2>\n<p>Undercuts are features that prevent part ejection from mold. They include side holes, threads, bosses, snap-fits, and external ribs oriented perpendicular to mold opening direction. Every undercut requires a specialized ejection mechanism in mold design.<\/p>\n<p>Injection mold designers classify undercut severity into three tiers based on depth-to-diameter ratio. Tier 1 undercuts (ratio below 0.25) use simple side pullers or angle pins and add minimal cost. Tier 2 undercuts (ratio 0.25 to 0.5) require lifters or collapsible cores with moderate cost impact. Tier 3 undercuts (ratio above 0.5) demand unscrewing mechanisms or multi-stage ejection systems that significantly increase tooling complexity and mold base size. Proper classification during the design phase prevents costly tooling modifications later.<\/p>\n<p>Each undercut type interacts with the overall mold architecture differently. Side actions require additional space in the mold base for angle pin guides and return springs. Unscrewing mechanisms need room for rack-and-pinion assemblies or hydraulic drive units. Collapsible cores demand precise tolerance control in the core segments to prevent flash during injection. These architectural constraints mean that undercut selection affects not just the ejection system but the entire mold layout and machine tonnage requirements.<\/p>\n<h3>Undercut Severity Classification<\/h3>\n<p>Design engineers must evaluate undercut requirements alongside part function, assembly method, and target production volume to make informed trade-off decisions before finalizing the mold design approach for any project.<\/p>\n<p>Tooling cost varies significantly based on undercut complexity and production requirements. Simple external undercuts using side pullers cost $500\u2013$1,200 per feature and work reliably for shallow depths under 6 mm. Unscrewing mechanisms for threaded features cost $2,000\u2013$5,000 per cavity but enable geometries otherwise impossible to mold. Collapsible cores for complex internal undercuts cost $3,000\u2013$7,000 per cavity and handle geometries up to 20 mm deep that side actions cannot reach. Always compare tooling cost against production volume and part requirements to select the most cost-effective undercut solution.<\/p>\n<figure style=\"text-align:center;margin:2em 0;\">\n<img decoding=\"async\" width=\"800\" height=\"457\" src=\"https:\/\/zetarmold.com\/wp-content\/uploads\/2025\/12\/injection-mold-lifter-diagram.webp\" class=\"wp-image-51673\" alt=\"\u5c04\u51fa\u6210\u5f62\u7528\u30ea\u30d5\u30bf\u30fc\u56f3\" style=\"max-width:100%;height:auto;\" srcset=\"https:\/\/zetarmold.com\/wp-content\/uploads\/2025\/12\/injection-mold-lifter-diagram.webp 800w, https:\/\/zetarmold.com\/wp-content\/uploads\/2025\/12\/injection-mold-lifter-diagram-300x171.webp 300w, https:\/\/zetarmold.com\/wp-content\/uploads\/2025\/12\/injection-mold-lifter-diagram-768x439.webp 768w, https:\/\/zetarmold.com\/wp-content\/uploads\/2025\/12\/injection-mold-lifter-diagram-18x10.webp 18w, https:\/\/zetarmold.com\/wp-content\/uploads\/2025\/12\/injection-mold-lifter-diagram-600x343.webp 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption style=\"font-size:0.78em; color:#888; font-style:italic; margin-top:4px; text-align:center;\">Side lifter undercut<\/figcaption><\/figure>\n<p>In our 20+ years running injection molds at ZetarMold&#8217;s Shanghai facility, we see undercuts in approximately 35% of the 100+ mold sets we build each month. Threaded features (screw bosses, bottle threads) are the most common, followed by snap-fit details and side windows. Our 8 senior engineers\u2014with 10+ years of experience each\u2014review undercut feasibility as a mandatory step in every DFM review before cutting steel.<\/p>\n<p>Undercut complexity affects tooling cost. A part with two simple undercuts costs approximately 25-35% more to tool than an equivalent undercut-free design. Multiple undercuts or internal undercuts increase tooling cost by 50-80% and require complex mold actions like collapsible cores or unscrewing mechanisms.<\/p>\n<h2>When Should You Use Side Actions?<\/h2>\n<p>Side actions use angle pins or side cores that pull perpendicular to mold opening direction. They work best for shallow undercuts under 6 mm deep. Side pullers cost less than unscrewing mechanisms but have depth limitations.<\/p>\n<p>Use side actions when undercut depth is 3-6 mm and undercut feature is on exterior surface. Deeper than 6 mm causes pin deflection or insufficient ejection force. Side pullers work well for side holes, slots, and external undercuts with simple geometry.<\/p>\n<p>Side actions add approximately $500\u2013$1,200 per undercut to tooling cost depending on complexity. Multiple side actions on one cavity increase tooling cost multiplicatively. For high-volume production, this upfront cost pays back through reduced per-part ejection complexity.<\/p>\n<h2>How Does Unscrewing Design Work?<\/h2>\n<p>Unscrewing mechanisms rotate threaded features out of mold during ejection. They handle threaded holes, threaded bosses, and external threads up to 150 mm in diameter. Unscrewing cores drive via rack-and-pinion, hydraulic motor, or electric servo.<\/p>\n<p>Threaded features require unscrewing in most cases because threaded cores trap part during normal ejection. Common parts needing unscrewing include bottle caps, threaded closures, screw bosses, and cylindrical components with external threads. The thread pitch and length determine rotation requirements.<\/p>\n<p>Unscrewing adds significant tooling cost\u2014approximately $2,000\u2013$5,000 per cavity depending on thread complexity and drive mechanism. Unscrewing also increases cycle time by 2-4 seconds due to required rotation and retraction. Design parts with minimum thread length and avoid unscrewing if thread can be added during secondary operations.<\/p>\n<figure style=\"text-align:center;margin:2em 0;\">\n<img decoding=\"async\" width=\"800\" height=\"457\" src=\"https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/04\/injection-molding-machine-diag-800x457-1.jpg\" class=\"wp-image-53260\" alt=\"Injection molding machine diagram\" style=\"max-width:100%;height:auto;\" srcset=\"https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/04\/injection-molding-machine-diag-800x457-1.jpg 800w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/04\/injection-molding-machine-diag-800x457-1-300x171.jpg 300w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/04\/injection-molding-machine-diag-800x457-1-768x439.jpg 768w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/04\/injection-molding-machine-diag-800x457-1-18x10.jpg 18w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/04\/injection-molding-machine-diag-800x457-1-600x343.jpg 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption style=\"font-size:0.78em; color:#888; font-style:italic; margin-top:4px; text-align:center;\">Mold ejection diagram<\/figcaption><\/figure>\n<h2>What Are Collapsible Cores and When Are They Used?<\/h2>\n<p>Collapsible cores use segmented core sections that collapse inward during ejection. They handle internal undercuts up to 20 mm deep and are preferred for complex internal geometries like internal snap-fits, internal ribs, and complex internal undercut features.<\/p>\n<p>Collapsible cores cost more than side actions but handle deeper internal undercuts that side pullers cannot reach. The core segments retract into a guide pillar during ejection, creating clearance for undercut features to pass through. Collapsible cores reset when mold closes, driven by springs or hydraulic actuators.<\/p>\n<p>Use collapsible cores for internal undercuts 6-20 mm deep where part geometry prevents side access. They increase tooling cost by $3,000\u2013$7,000 per cavity but enable geometries that otherwise would require assembly of multiple parts.<\/p>\n<h2>How Do Lifters Handle External Undercuts?<\/h2>\n<p>Lifters are angled pins that push parts out from undercut features during ejection. They work best for external undercuts like side holes, slots, and external ribs that are shallow and accessible from parting line. Lifters typically use 5-15 degree draft angle to push parts clear of undercut features.<\/p>\n<p>Lifters cost less than collapsible cores for simple external undercuts. However, lifter travel must accommodate undercut depth. If undercut exceeds lifter travel, part remains trapped in mold. Design undercut features with lifter-friendly geometry\u2014straight sidewalls, no reverse drafts, and adequate clearance for lifter movement.<\/p>\n<p>Use lifters for external undercuts under 8 mm deep on part exterior surfaces where mold design provides access. Lifters add $800\u2013$1,500 per feature to tooling cost but offer reliable ejection for simple undercut geometries.<\/p>\n<h2>How Do You Choose the Right Undercut Solution?<\/h2>\n<p>Select undercut mechanism based on undercut depth, location (internal\/external), and production volume. Simple external undercuts under 6 mm deep work well with lifters. Deeper external undercuts or threaded features require unscrewing. Internal undercuts over 6 mm deep need collapsible cores.<\/p>\n<figure style=\"text-align:center;margin:2em 0;\">\n<img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"457\" src=\"https:\/\/zetarmold.com\/wp-content\/uploads\/2025\/11\/blue-plastic-injection-mold-parts.webp\" class=\"wp-image-51622\" alt=\"\u306d\u3058\u5c71\u3092\u6301\u3064\u5c04\u51fa\u6210\u5f62\u90e8\u54c1\" style=\"max-width:100%;height:auto;\" srcset=\"https:\/\/zetarmold.com\/wp-content\/uploads\/2025\/11\/blue-plastic-injection-mold-parts.webp 800w, https:\/\/zetarmold.com\/wp-content\/uploads\/2025\/11\/blue-plastic-injection-mold-parts-300x171.webp 300w, https:\/\/zetarmold.com\/wp-content\/uploads\/2025\/11\/blue-plastic-injection-mold-parts-768x439.webp 768w, https:\/\/zetarmold.com\/wp-content\/uploads\/2025\/11\/blue-plastic-injection-mold-parts-18x10.webp 18w, https:\/\/zetarmold.com\/wp-content\/uploads\/2025\/11\/blue-plastic-injection-mold-parts-600x343.webp 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption style=\"font-size:0.78em; color:#888; font-style:italic; margin-top:4px; text-align:center;\">Threaded features<\/figcaption><\/figure>\n<p>Depth-to-diameter ratio is the primary design guide. Undercuts shallower than 25% of feature diameter resolve with side actions. Undercuts deeper than 50% of feature diameter require unscrewing or collapsible cores. Multiple undercuts multiply tooling complexity.<\/p>\n<p>Tooling cost escalation follows undercut complexity closely. Each additional undercut mechanism multiplies tooling complexity rather than adding linearly. A single internal undercut with collapsible core costs $3,000-$7,000 per cavity, while adding a second internal undercut on the same part increases total mechanism cost by 60-80%. Plan undercut features during product design phase to minimize total mechanism count and reduce overall tooling investment.<\/p>\n<p>\u751f\u7523\u6570\u91cf\u306f\u30b3\u30b9\u30c8\u6b63\u5f53\u6027\u306b\u5f71\u97ff\u3057\u307e\u3059\u3002\u5c11\u91cf\u751f\u7523\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\uff0850,000\u500b\u672a\u6e80\uff09\u3067\u306f\u3001\u8907\u96d1\u306a\u30a2\u30f3\u30c0\u30fc\u30ab\u30c3\u30c8\u6a5f\u69cb\u3092\u907f\u3051\u308b\u3079\u304d\u3067\u3059\u3002\u5927\u91cf\u751f\u7523\uff08500,000\u500b\u4ee5\u4e0a\uff09\u3067\u306f\u3001\u30b5\u30a4\u30af\u30eb\u6642\u9593\u3092\u77ed\u7e2e\u3057\u305f\u308a\u7d44\u307f\u7acb\u3066\u5de5\u7a0b\u3092\u6392\u9664\u3057\u305f\u308a\u3059\u308b\u30a2\u30f3\u30b9\u30af\u30ea\u30e5\u30fc\u3084\u30b3\u30e9\u30d7\u30b7\u30d6\u30eb\u30b3\u30a2\u306e\u305f\u3081\u306e\u5148\u884c\u91d1\u578b\u30b3\u30b9\u30c8\u304c\u6b63\u5f53\u5316\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u30b3\u30b9\u30c8\u4fbf\u76ca\u5206\u6790\u306f\u3001\u521d\u671f\u306e\u91d1\u578b\u6295\u8cc7\u3068\u751f\u7523\u91cf\u3092\u6bd4\u8f03\u3059\u308b\u3053\u3068\u3067\u6a5f\u69cb\u9078\u629e\u3092\u5c0e\u304d\u307e\u3059\u3002\u5e74\u959350\u4e07\u30b7\u30e7\u30c3\u30c8\u3067\u751f\u7523\u3055\u308c\u308b\u90e8\u54c1\u306b$3,000\u306e\u53ce\u7e2e\u30b3\u30a2\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u4e8c\u6b21\u52a0\u5de5\u3068\u6bd4\u8f03\u3057\u3066\u30b5\u30a4\u30af\u30eb\u3042\u305f\u308a\u7d042\u79d2\u77ed\u7e2e\u3055\u308c\u3001\u521d\u5e74\u5ea6\u3067\u91d1\u578b\u6295\u8cc7\u3092\u56de\u53ce\u3067\u304d\u307e\u3059\u3002\u5f53\u793e\u306e\u30a8\u30f3\u30b8\u30cb\u30a2\u30ea\u30f3\u30b0\u30c1\u30fc\u30e0\u306f\u3001 <a href=\"https:\/\/zetarmold.com\/ja\/%e3%82%a2%e3%83%b3%e3%83%80%e3%83%bc%e3%82%ab%e3%83%83%e3%83%88%e8%a8%ad%e8%a8%88%e3%81%a8%e3%81%af%e5%b0%84%e5%87%ba%e6%88%90%e5%bd%a2%e3%81%ab%e3%81%8a%e3%81%84%e3%81%a6%e4%bd%95%e3%81%a7%e3%81%99\/\">DFM review<\/a><sup id=\"fnref1:3\"><a href=\"#fn:3\" class=\"footnote-ref\">3<\/a><\/sup> 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3067\u5272\u3063\u305f\u5024\u3067\u3059\u30020.25\u672a\u6e80\u306e\u6bd4\u7387\u3067\u306f\u901a\u5e38\u30b5\u30a4\u30c9\u30a2\u30af\u30b7\u30e7\u30f3\u304c\u4f7f\u7528\u53ef\u80fd\u3067\u3059\u30020.25\u301c0.5\u306e\u6bd4\u7387\u3067\u306f\u3001\u5f62\u72b6\u3068\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\u306b\u5fdc\u3058\u3066\u30ea\u30d5\u30bf\u30fc\u307e\u305f\u306f\u53ce\u7e2e\u30b3\u30a2\u3092\u4f7f\u7528\u3057\u307e\u3059\u30020.5\u3092\u8d85\u3048\u308b\u6bd4\u7387\u3067\u306f\u3001\u306d\u3058\u5207\u308a\u6a5f\u69cb\u307e\u305f\u306f\u4ee3\u66ff\u306e\u53d6\u308a\u51fa\u3057\u65b9\u6cd5\u304c\u5fc5\u8981\u3067\u3059\u3002\u53d6\u308a\u51fa\u3057\u3092\u7c21\u7d20\u5316\u3057\u91d1\u578b\u30b3\u30b9\u30c8\u3092\u524a\u6e1b\u3059\u308b\u305f\u3081\u3001\u30a2\u30f3\u30c0\u30fc\u30ab\u30c3\u30c8\u5f62\u72b6\u306f\u76f4\u5f84\u306b\u5bfe\u3057\u3066\u53ef\u80fd\u306a\u9650\u308a\u6d45\u304f\u4fdd\u3061\u307e\u3059\u3002\u3053\u306e\u6bd4\u7387\u306f\u3001\u88fd\u54c1\u958b\u767a\u304a\u3088\u3073\u91d1\u578b\u8a2d\u8a08\u6bb5\u968e\u306b\u304a\u3044\u3066\u9069\u5207\u306a\u30a2\u30f3\u30c0\u30fc\u30ab\u30c3\u30c8\u53d6\u308a\u51fa\u3057\u6a5f\u69cb\u3092\u9078\u629e\u3059\u308b\u305f\u3081\u306e\u4e3b\u8981\u306a\u8a2d\u8a08\u6307\u91dd\u3068\u306a\u308a\u307e\u3059\u3002\u30a8\u30f3\u30b8\u30cb\u30a2\u306f\u3053\u306e\u6bd4\u7387\u3092\u4f7f\u7528\u3057\u3066\u3001\u8a73\u7d30\u306aDFM\u5206\u6790\u306e\u524d\u306b\u9069\u5207\u306a\u30a2\u30f3\u30c0\u30fc\u30ab\u30c3\u30c8\u89e3\u6c7a\u7b56\u3092\u8fc5\u901f\u306b\u6c7a\u5b9a\u3057\u307e\u3059\u3002<\/p>\n<p><strong>\u7c21\u6613\u30eb\u30fc\u30eb:<\/strong> \u30a8\u30b8\u30a7\u30af\u30b7\u30e7\u30f3\u6a5f\u69cb\u3092\u9078\u629e\u3059\u308b\u524d\u306b\u3001\u5e38\u306b\u30a2\u30f3\u30c0\u30fc\u30ab\u30c3\u30c8\u306e\u6df1\u3055\u5bfe\u76f4\u5f84\u6bd4\u3092\u8a08\u7b97\u3057\u3066\u304f\u3060\u3055\u3044\u30020.25\u672a\u6e80\u306e\u6bd4\u7387\u306f\u30b5\u30a4\u30c9\u30a2\u30af\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3057\u307e\u3059\u30020.25\uff5e0.5\u306e\u6bd4\u7387\u306f\u30ea\u30d5\u30bf\u30fc\u307e\u305f\u306f\u30b3\u30e9\u30d7\u30b7\u30d6\u30eb\u30b3\u30a2\u3092\u4f7f\u7528\u3057\u307e\u3059\u30020.5\u3092\u8d85\u3048\u308b\u6bd4\u7387\u306f\u30a2\u30f3\u30b9\u30af\u30ea\u30e5\u30fc\u3092\u5fc5\u8981\u3068\u3057\u307e\u3059\u3002\u9ad8\u984d\u306a\u91d1\u578b\u4fee\u6b63\u3092\u907f\u3051\u308b\u305f\u3081\u3001\u91d1\u578b\u88fd\u4f5c\u524d\u306bDFM\u30ec\u30d3\u30e5\u30fc\u3092\u4f9d\u983c\u3057\u3001\u30a2\u30f3\u30c0\u30fc\u30ab\u30c3\u30c8\u8a2d\u8a08\u306e\u524d\u63d0\u6761\u4ef6\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<figure style=\"text-align:center;margin:2em 0;\">\n<img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"457\" src=\"https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/04\/injection-molding-process-flow-800x457-1.jpg\" class=\"wp-image-53261\" alt=\"Injection molding process flow\" style=\"max-width:100%;height:auto;\" srcset=\"https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/04\/injection-molding-process-flow-800x457-1.jpg 800w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/04\/injection-molding-process-flow-800x457-1-300x171.jpg 300w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/04\/injection-molding-process-flow-800x457-1-768x439.jpg 768w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/04\/injection-molding-process-flow-800x457-1-18x10.jpg 18w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/04\/injection-molding-process-flow-800x457-1-600x343.jpg 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption style=\"font-size:0.78em; color:#888; font-style:italic; margin-top:4px; text-align:center;\">\u91d1\u578b\u8a2d\u8a08\u30d7\u30ed\u30bb\u30b9<\/figcaption><\/figure>\n<h2>Factory Insight<\/h2>\n<p>ZetarMold\u3067\u306f\u3001\u4e0a\u6d77\u5de5\u5834\u306b45\u53f0\u306e\u5c04\u51fa\u6210\u5f62\u6a5f\uff0890T\uff5e1850T\uff09\u3092\u7a3c\u50cd\u3055\u305b\u3066\u3044\u307e\u3059\u30022005\u5e74\u304b\u3089\u306e20\u5e74\u4ee5\u4e0a\u306b\u308f\u305f\u308a\u30018\u540d\u306e\u30b7\u30cb\u30a2\u30a8\u30f3\u30b8\u30cb\u30a2\u304c\u30016 mm\u306e\u5916\u90e8\u30b9\u30ca\u30c3\u30d7\u30d5\u30a3\u30c3\u30c8\u7528\u306e\u5358\u7d14\u306a\u30ea\u30d5\u30bf\u30fc\u304b\u3089150 mm\u306e\u306d\u3058\u5c71\u30ad\u30e3\u30c3\u30d7\u7528\u306e\u591a\u8ef8\u30a2\u30f3\u30b9\u30af\u30ea\u30e5\u30fc\u6a5f\u69cb\u307e\u3067\u3001\u3042\u3089\u3086\u308b\u8907\u96d1\u3055\u306e\u30ec\u30d9\u30eb\u3067\u30a2\u30f3\u30c0\u30fc\u30ab\u30c3\u30c8\u30bd\u30ea\u30e5\u30fc\u30b7\u30e7\u30f3\u3092\u5099\u3048\u305f\u91d1\u578b\u3092\u8a2d\u8a08\u3057\u3066\u304d\u307e\u3057\u305f\u3002\u52a0\u5de5\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306b400\u4ee5\u4e0a\u306e\u6750\u6599\u3092\u4fdd\u6709\u3057\u3001120\u540d\u4ee5\u4e0a\u306e\u751f\u7523\u30b9\u30bf\u30c3\u30d5\uff0870\uff05\u304c10\u5e74\u4ee5\u4e0a\u306e\u7d4c\u9a13\uff09\u3092\u64c1\u3059\u308b\u5f53\u793e\u306f\u3001\u90e8\u54c1\u5f62\u72b6\u3068\u751f\u7523\u6570\u91cf\u3092\u8a55\u4fa1\u3057\u3001\u6700\u3082\u8cbb\u7528\u5bfe\u52b9\u679c\u306e\u9ad8\u3044\u30a2\u30f3\u30c0\u30fc\u30ab\u30c3\u30c8\u30bd\u30ea\u30e5\u30fc\u30b7\u30e7\u30f3\u3092\u63a8\u5968\u3057\u307e\u3059\u3002\u5f53\u793e\u306e\u91d1\u578b\u5de5\u5834\u3067\u306f\u6708\u306b100\u30bb\u30c3\u30c8\u4ee5\u4e0a\u306e\u91d1\u578b\u3092\u751f\u7523\u3057\u3066\u304a\u308a\u3001\u751f\u7523\u898f\u6a21\u306b\u304a\u3051\u308b\u30a2\u30f3\u30c0\u30fc\u30ab\u30c3\u30c8\u306e\u4fe1\u983c\u6027\u306b\u95a2\u3059\u308b\u6df1\u3044\u5b9f\u52d9\u7d4c\u9a13\u3092\u6709\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p><strong>\u30a2\u30f3\u30c0\u30fc\u30ab\u30c3\u30c8\u8a2d\u8a08\u306b\u3064\u3044\u3066\u8a71\u3057\u5408\u3044\u307e\u3057\u3087\u3046\u304b\uff1f<\/strong> 3D CAD\u30d5\u30a1\u30a4\u30eb\u3092\u5f53\u793e\u306e\u30a8\u30f3\u30b8\u30cb\u30a2\u30ea\u30f3\u30b0\u30c1\u30fc\u30e0\u306b\u9001\u4fe1\u3057\u3001\u7121\u6599\u306eDFM\u30ec\u30d3\u30e5\u30fc\u3092\u53d7\u3051\u3066\u304f\u3060\u3055\u3044\u3002\u30a2\u30f3\u30c0\u30fc\u30ab\u30c3\u30c8\u30ea\u30b9\u30af\u3092\u7279\u5b9a\u3057\u3001\u9069\u5207\u306a\u53d6\u308a\u51fa\u3057\u6a5f\u69cb\u3092\u63a8\u5968\u3057\u300124\u6642\u9593\u4ee5\u5185\u306b\u8a73\u7d30\u306a\u91d1\u578b\u898b\u7a4d\u3082\u308a\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002ZetarMold\u306b\u4eca\u3059\u3050\u304a\u554f\u3044\u5408\u308f\u305b\u304f\u3060\u3055\u3044\u3002<\/p>\n<hr style=\"margin:2em 0;border:none;border-top:1px solid #e0e0e0;\" \/>\n<ol class=\"footnotes\">\n<li id=\"fn:1\">\n<p><strong>\u30a2\u30f3\u30c0\u30fc\u30ab\u30c3\u30c8\uff1a<\/strong> \u5c04\u51fa\u6210\u5f62\u306b\u304a\u3051\u308b\u30a2\u30f3\u30c0\u30fc\u30ab\u30c3\u30c8\u3068\u306f\u3001\u30b5\u30a4\u30c9\u7a74\u3001\u306d\u3058\u3001\u30b9\u30ca\u30c3\u30d7\u30d5\u30a3\u30c3\u30c8\u3001\u91d1\u578b\u958b\u304d\u65b9\u5411\u306b\u5bfe\u3057\u3066\u5782\u76f4\u65b9\u5411\u306e\u5916\u90e8\u30ea\u30d6\u306a\u3069\u3001\u91d1\u578b\u304b\u3089\u306e\u76f4\u7dda\u7684\u306a\u53d6\u308a\u51fa\u3057\u3092\u59a8\u3052\u308b\u90e8\u54c1\u5f62\u72b6\u3067\u3059\u3002 <a href=\"#fnref1:1\" class=\"footnote-backref\">\u21a9<\/a><\/p>\n<\/li>\n<li id=\"fn:2\">\n<p><strong>\u30b3\u30e9\u30d7\u30b7\u30d6\u30eb\u30b3\u30a2\uff1a<\/strong> \u53ce\u7e2e\u30b3\u30a2\u306f\u3001\u3070\u306d\u307e\u305f\u306f\u6cb9\u5727\u30a2\u30af\u30c1\u30e5\u30a8\u30fc\u30bf\u306b\u3088\u3063\u3066\u99c6\u52d5\u3055\u308c\u3001\u53d6\u308a\u51fa\u3057\u6642\u306b\u5185\u5074\u306b\u53ce\u7e2e\u3057\u3066\u6df1\u305520mm\u307e\u3067\u306e\u5185\u90e8\u30a2\u30f3\u30c0\u30fc\u30ab\u30c3\u30c8\u5f62\u72b6\u3092\u30af\u30ea\u30a2\u3059\u308b\u3001\u5206\u5272\u3055\u308c\u305f\u91d1\u578b\u30b3\u30a2\u3067\u3059\u3002 <a href=\"#fnref1:2\" class=\"footnote-backref\">\u21a9<\/a><\/p>\n<\/li>\n<li id=\"fn:3\">\n<p><strong>DFM review:<\/strong> DFM\u30ec\u30d3\u30e5\u30fc\uff08\u88fd\u9020\u9069\u5408\u6027\u8a2d\u8a08\u30ec\u30d3\u30e5\u30fc\uff09\u306f\u3001\u91d1\u578b\u6295\u8cc7\u524d\u306b\u90e8\u54c1\u5f62\u72b6\u306e\u751f\u7523\u53ef\u80fd\u6027\u3092\u8a55\u4fa1\u3057\u3001\u30a2\u30f3\u30c0\u30fc\u30ab\u30c3\u30c8\u5f62\u72b6\u3092\u7279\u5b9a\u3057\u3001\u91d1\u578b\u30b3\u30b9\u30c8\u3092\u6700\u9069\u5316\u3059\u308b\u305f\u3081\u306e\u8a2d\u8a08\u4ee3\u66ff\u6848\u3092\u63a8\u5968\u3057\u307e\u3059\u3002 <a href=\"#fnref1:3\" class=\"footnote-backref\">\u21a9<\/a><\/p>\n<\/li>\n<\/ol>\n<p><script type=\"application\/ld+json\">{\n    \"@context\": \"https:\\\/\\\/schema.org\",\n    \"@type\": \"FAQPage\",\n    \"mainEntity\": [\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What is an undercut in injection molding?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"An undercut is any feature on an injection-molded part that prevents straight ejection from the mold cavity. Common undercut features include side holes, threads, snap-fits, and internal ribs oriented perpendicular to the mold-opening direction. Undercuts require special mold mechanisms such as side actions, lifters, or collapsible cores to release the part without damage.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What is the difference between a lifter and a side action?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"A side action (slide) moves in a straight horizontal direction to release external undercuts along the parting line. A lifter rotates outward at an angle during ejection to clear internal undercuts. Side actions handle larger undercut areas and are more reliable for high-volume production, while lifters save tooling cost on smaller internal features but leave visible witness marks.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"When should I use a collapsible core instead of a lifter?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Collapsible cores are preferred when the part has continuous internal undercuts such as internal threads, grooves, or retaining rings that wrap around 360 degrees. Lifters work for localized internal features. The depth-to-diameter ratio determines the choice: ratios below 0.5 suit lifters, while ratios above 1.0 require collapsible cores or unscrewing mechanisms.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Can undercuts be designed out of a part?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Many undercuts can be eliminated through design changes. Common strategies include adding draft angles to side walls, using through-holes instead of blind holes, replacing snap-fits with adhesive bonds or screws, and splitting parts into two halves. Eliminating undercuts reduces tooling cost by 15 to 40 percent and improves mold reliability.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"How much does an undercut add to mold cost?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Each undercut mechanism adds tooling cost. A single lifter adds 5 to 15 percent to mold cost. A side action adds 10 to 25 percent. Collapsible cores and unscrewing mechanisms can add 25 to 50 percent. The exact cost depends on undercut size, depth, production volume, and required precision.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What is the maximum undercut depth for injection molding?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Maximum undercut depth depends on the mechanism used. Lifters handle internal undercuts up to approximately 6 mm deep. Side actions handle external undercuts up to 50 mm or more. Collapsible cores manage internal undercuts up to 20 mm deep. The depth-to-diameter ratio is the key metric: ratios below 0.5 are easy, 0.5 to 1.0 are moderate, and above 1.0 require special mechanisms.\"\n            }\n        }\n    ]\n}<\/script><\/p>","protected":false},"excerpt":{"rendered":"<p>\u30ad\u30fc\u30dd\u30a4\u30f3\u30c8\n\u30b5\u30a4\u30c9\u30a2\u30af\u30b7\u30e7\u30f3\u3001\u30a2\u30f3\u30b9\u30af\u30ea\u30e5\u30fc\u6a5f\u69cb\u3001\u30ea\u30d5\u30bf\u30fc\u3001\u53ce\u7e2e\u30b3\u30a2\u306f\u30a2\u30f3\u30c0\u30fc\u30ab\u30c3\u30c8\u3092\u51e6\u7406\u3059\u308b\n\u30a2\u30f3\u30c0\u30fc\u30ab\u30c3\u30c8\u306e\u6df1\u3055\u3068\u76f4\u5f84\u306e\u6bd4\u7387\u304c\u6700\u9069\u306a\u65b9\u6cd5\u3092\u6c7a\u5b9a\u3059\u308b\n\u53ce\u7e2e\u30b3\u30a2\u306f\u30b5\u30a4\u30c9\u30a2\u30af\u30b7\u30e7\u30f3\u3088\u308a\u6df1\u3044\u30a2\u30f3\u30c0\u30fc\u30ab\u30c3\u30c8\u306b\u5bfe\u5fdc\u53ef\u80fd\n\u30b5\u30a4\u30c9\u30d7\u30fc\u30e9\u30fc\u306f\u30a2\u30f3\u30c0\u30fc\u30ab\u30c3\u30c8\u7279\u5fb4\u3054\u3068\u306b\u91d1\u578b\u30b3\u30b9\u30c8\u309215\u301c20\uff05\u5897\u52a0\u3055\u305b\u308b\n\u91d1\u578b\u88fd\u4f5c\u524d\u306eDFM\u30ec\u30d3\u30e5\u30fc\u304c\u9ad8\u984d\u306a\u8a2d\u8a08\u5909\u66f4\u3092\u9632\u6b62\n\u300c\u30b5\u30a4\u30c9\u30a2\u30af\u30b7\u30e7\u30f3\u306f\u6df1\u30556mm\u307e\u3067\u306e\u30a2\u30f3\u30c0\u30fc\u30ab\u30c3\u30c8\u3092\u52b9\u679c\u7684\u306b\u51e6\u7406\u3057\u3001\u30a2\u30f3\u30b9\u30af\u30ea\u30e5\u30fc\u6a5f\u69cb\u3088\u308a\u30b3\u30b9\u30c8\u304c\u4f4e\u3044\u300d\n\u771f\u306e\u30a2\u30f3\u30c0\u30fc\u30ab\u30c3\u30c81\u306f\u89d2\u5ea6\u30d4\u30f3\u307e\u305f\u306f\u91d1\u578b\u958b\u9589\u65b9\u5411\u306b\u5782\u76f4\u306b\u5f15\u304d\u629c\u304f\u30b5\u30a4\u30c9\u30b3\u30a2\u3092\u4f7f\u7528\u3059\u308b\u3002\u91d1\u578b\u8a2d\u8a08\u304c\u5782\u76f4\u30a2\u30af\u30bb\u30b9\u3092\u63d0\u4f9b\u3059\u308b\u90e8\u54c1\u8868\u9762\u306e\u6d45\u3044\u5916\u90e8\u30a2\u30f3\u30c0\u30fc\u30ab\u30c3\u30c8\u306b\u9069\u3059\u308b\u30026mm\u3092\u8d85\u3048\u308b\u6df1\u3055\u3067\u306f\u30d4\u30f3\u306e\u305f\u308f\u307f\u3084\u5c04\u51fa\u529b\u4e0d\u8db3\u3092\u5f15\u304d\u8d77\u3053\u3059\u3002\n\u300c\u306d\u3058\u7279\u5fb4\u306b\u306f\u5e38\u306b\u30a2\u30f3\u30b9\u30af\u30ea\u30e5\u30fc\u6a5f\u69cb\u304c\u5fc5\u8981\u3067\u3042\u308b\u300d\n\u8aa4\u308a [\u2026]<\/p>","protected":false},"author":1,"featured_media":51673,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_seopress_robots_primary_cat":"","_seopress_titles_title":"Injection Molding Undercut Design: Complete Guide","_seopress_titles_desc":"Compare undercut design solutions: side actions, lifters, collapsible cores, and unscrewing mechanisms. Depth-to-diameter ratio guide for mold designers.","_seopress_robots_index":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[73],"tags":[150,89,190],"meta_box":{"post-to-quiz_to":[]},"_links":{"self":[{"href":"https:\/\/zetarmold.com\/ja\/wp-json\/wp\/v2\/posts\/53737"}],"collection":[{"href":"https:\/\/zetarmold.com\/ja\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/zetarmold.com\/ja\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/zetarmold.com\/ja\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/zetarmold.com\/ja\/wp-json\/wp\/v2\/comments?post=53737"}],"version-history":[{"count":0,"href":"https:\/\/zetarmold.com\/ja\/wp-json\/wp\/v2\/posts\/53737\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/zetarmold.com\/ja\/wp-json\/wp\/v2\/media\/51673"}],"wp:attachment":[{"href":"https:\/\/zetarmold.com\/ja\/wp-json\/wp\/v2\/media?parent=53737"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/zetarmold.com\/ja\/wp-json\/wp\/v2\/categories?post=53737"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/zetarmold.com\/ja\/wp-json\/wp\/v2\/tags?post=53737"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}