{"id":588,"date":"2026-07-07T10:04:30","date_gmt":"2026-07-07T10:04:30","guid":{"rendered":"https:\/\/energystoragecabinetfactory.com\/?p=588"},"modified":"2026-07-07T10:04:33","modified_gmt":"2026-07-07T10:04:33","slug":"avoid-thin-sheet-deformation-cnc-milling","status":"publish","type":"post","link":"https:\/\/energystoragecabinetfactory.com\/zh\/avoid-thin-sheet-deformation-cnc-milling\/","title":{"rendered":"How to Avoid Thin Sheet Deformation in Secondary CNC Milling | 2026 DFM Guide"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"588\" class=\"elementor elementor-588\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-41153aef e-flex e-con-boxed e-con e-parent\" data-id=\"41153aef\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-55fd1e6f e-con-full e-flex e-con e-child\" data-id=\"55fd1e6f\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;,&quot;position&quot;:&quot;absolute&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-46f7b2f1 elementor-absolute elementor-widget elementor-widget-theme-site-logo elementor-widget-image\" data-id=\"46f7b2f1\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_position&quot;:&quot;absolute&quot;}\" data-widget_type=\"theme-site-logo.default\">\n\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/energystoragecabinetfactory.com\/zh\">\n\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"2560\" height=\"444\" src=\"https:\/\/energystoragecabinetfactory.com\/wp-content\/uploads\/2026\/04\/logo-scaled-144x25.png\" class=\"attachment-full size-full wp-image-47\" alt=\"\" srcset=\"https:\/\/energystoragecabinetfactory.com\/wp-content\/uploads\/2026\/04\/logo-scaled.png 2560w, https:\/\/energystoragecabinetfactory.com\/wp-content\/uploads\/2026\/04\/logo-scaled-300x52.png 300w, https:\/\/energystoragecabinetfactory.com\/wp-content\/uploads\/2026\/04\/logo-scaled-1024x178.png 1024w, https:\/\/energystoragecabinetfactory.com\/wp-content\/uploads\/2026\/04\/logo-scaled-768x133.png 768w, https:\/\/energystoragecabinetfactory.com\/wp-content\/uploads\/2026\/04\/logo-scaled-1536x266.png 1536w, https:\/\/energystoragecabinetfactory.com\/wp-content\/uploads\/2026\/04\/logo-scaled-2048x355.png 2048w, https:\/\/energystoragecabinetfactory.com\/wp-content\/uploads\/2026\/04\/logo-scaled-18x3.png 18w, https:\/\/energystoragecabinetfactory.com\/wp-content\/uploads\/2026\/04\/logo-scaled-144x25.png 144w\" sizes=\"(max-width: 2560px) 100vw, 2560px\" \/>\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-99d066b elementor-absolute elementor-widget elementor-widget-button\" data-id=\"99d066b\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_position&quot;:&quot;absolute&quot;}\" data-widget_type=\"button.default\">\n\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"#\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">\u83b7\u53d6\u62a5\u4ef7<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-61e16e9 elementor-widget__width-initial elementor-absolute elementor-nav-menu--dropdown-tablet elementor-nav-menu__text-align-aside elementor-nav-menu--toggle elementor-nav-menu--burger elementor-widget elementor-widget-nav-menu\" data-id=\"61e16e9\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_position&quot;:&quot;absolute&quot;,&quot;layout&quot;:&quot;horizontal&quot;,&quot;submenu_icon&quot;:{&quot;value&quot;:&quot;&lt;svg aria-hidden=\\&quot;true\\&quot; 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Alloy End Cap | OEM Fabrication<\/a><\/li>\n\t<li class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-501\"><a href=\"https:\/\/energystoragecabinetfactory.com\/zh\/automotive-interior-stamped-metal-components\/\" class=\"elementor-sub-item menu-link\" tabindex=\"-1\">automotive interior stamped metal components<\/a><\/li>\n\t<li class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-604\"><a href=\"https:\/\/energystoragecabinetfactory.com\/zh\/cnc-sheet-metal-packaging-machine-frame-enclosure\/\" class=\"elementor-sub-item menu-link\" tabindex=\"-1\">Custom CNC Sheet Metal Frame &#038; Enclosure for Packaging Machine<\/a><\/li>\n<\/ul>\n<\/li>\n<\/ul>\t\t\t<\/nav>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-648a4f82 e-flex e-con-boxed e-con e-parent\" data-id=\"648a4f82\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-78df0337 e-flex e-con-boxed e-con e-parent\" data-id=\"78df0337\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-3cd5c8ea e-con-full e-flex e-con e-child\" data-id=\"3cd5c8ea\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-631d31f elementor-widget elementor-widget-heading\" data-id=\"631d31f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">How to Avoid Thin Sheet Deformation in Secondary CNC Milling<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1d807138 elementor-widget elementor-widget-text-editor\" data-id=\"1d807138\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<div><p>Thin sheet metal parts (0.5mm-6mm) are widely used in BESS battery cabinets, inverter enclosures and industrial control shell components. Most OEM manufacturers and sheet metal fabricators run into a common problem: <strong>uncontrollable workpiece deformation during secondary CNC milling<\/strong>.<\/p><\/div><div><div>Even if you control forming tolerance perfectly with standard CNC press brake production, improper clamping and milling parameters will make thin sheet parts exceed \u00b10.3mm tolerance, leading to batch scrap and failed equipment assembly. This defect is one of the most controversial sheet metal issues discussed on <a title=\"\" href=\"https:\/\/link.wtturl.cn\/?target=https%3A%2F%2Fwww.reddit.com%2FR%2Ffabrication%2F&amp;scene=im&amp;aid=497858&amp;lang=zh\" target=\"_blank\" rel=\"noopener\">Reddit r<\/a> among design engineers and CNC machinists.<\/div><\/div><div><div>Most importantly, long cabinet panels that finish CNC bending processing are the most likely to deform during secondary milling. After solving <a href=\"https:\/\/energystoragecabinetfactory.com\/zh\/cnc-press-brake-springback-solution-for-long-cabinet-panels\/\"><strong>CNC press brake springback solution for long cabinet panels<\/strong><\/a> in bending stage, eliminating milling deformation becomes the second key step for qualified finished cabinet enclosures.<\/div><\/div><div><h2>Why Thin Sheet Metal Deforms During Secondary CNC Milling<\/h2><\/div><div><div>Different from solid block machining, thin sheet metal features poor structural rigidity and large residual forming stress. We conclude four core causes for this common defect based on new energy cabinet mass production data:<\/div><\/div><div><ol><li>Residual bending internal stress retained after CNC press brake forming<\/li><li>Uneven surface clamping pressure from ordinary flat machine fixtures<\/li><li>Excessive single-side cutting feed and unreasonable tool path programming<\/li><li>Improper material selection for galvanized and aluminum thin cabinet panels<img decoding=\"async\" class=\"alignnone wp-image-494 size-full\" src=\"https:\/\/energystoragecabinetfactory.com\/wp-content\/uploads\/2026\/06\/\u5916\u8d38\u7f51\u7ad9\u670d\u52a1\u5668\u8d2d\u4e70\u6307\u5357-10-scaled.png\" alt=\"\" width=\"2560\" height=\"1384\" srcset=\"https:\/\/energystoragecabinetfactory.com\/wp-content\/uploads\/2026\/06\/\u5916\u8d38\u7f51\u7ad9\u670d\u52a1\u5668\u8d2d\u4e70\u6307\u5357-10-scaled.png 2560w, https:\/\/energystoragecabinetfactory.com\/wp-content\/uploads\/2026\/06\/\u5916\u8d38\u7f51\u7ad9\u670d\u52a1\u5668\u8d2d\u4e70\u6307\u5357-10-300x162.png 300w, https:\/\/energystoragecabinetfactory.com\/wp-content\/uploads\/2026\/06\/\u5916\u8d38\u7f51\u7ad9\u670d\u52a1\u5668\u8d2d\u4e70\u6307\u5357-10-1024x554.png 1024w, https:\/\/energystoragecabinetfactory.com\/wp-content\/uploads\/2026\/06\/\u5916\u8d38\u7f51\u7ad9\u670d\u52a1\u5668\u8d2d\u4e70\u6307\u5357-10-768x415.png 768w, https:\/\/energystoragecabinetfactory.com\/wp-content\/uploads\/2026\/06\/\u5916\u8d38\u7f51\u7ad9\u670d\u52a1\u5668\u8d2d\u4e70\u6307\u5357-10-1536x831.png 1536w, https:\/\/energystoragecabinetfactory.com\/wp-content\/uploads\/2026\/06\/\u5916\u8d38\u7f51\u7ad9\u670d\u52a1\u5668\u8d2d\u4e70\u6307\u5357-10-2048x1107.png 2048w, https:\/\/energystoragecabinetfactory.com\/wp-content\/uploads\/2026\/06\/\u5916\u8d38\u7f51\u7ad9\u670d\u52a1\u5668\u8d2d\u4e70\u6307\u5357-10-18x10.png 18w\" sizes=\"(max-width: 2560px) 100vw, 2560px\" \/><\/li><\/ol><\/div><div><h2>5 Practical Solutions to Prevent CNC Milling Thin Sheet Deformation<\/h2><\/div><div><div>We adopt all field-verified methods that conform to<a title=\"\" href=\"https:\/\/link.wtturl.cn\/?target=https%3A%2F%2Fwww.manufacturingtoday.com%2F&amp;scene=im&amp;aid=497858&amp;lang=zh\" target=\"_blank\" rel=\"noopener\">Manufacturing Today industry processing<\/a>, fully compatible with pre-bent long cabinet shell parts:<\/div><\/div><div><h3>1. Custom Vacuum Support Fixtures (Most Effective)<\/h3><\/div><div><div>Abandon traditional side clamping fixtures for thin plates. Use full-surface vacuum adsorption jigs to evenly disperse clamping pressure. This method will not squeeze deformed edges on long bent cabinet panels, and keeps the original bending angle stable.<\/div><\/div><div><h3>2. Stress Relief Before Secondary Machining<\/h3><\/div><div><div>Place bent sheet metal workpieces statically for 12-24 hours to release bending residual stress before CNC milling. This simple operation greatly reduces post-milling warping, especially for SS304 and 5052 aluminum enclosure panels.<\/div><\/div><div><h3>3. Optimize CNC Milling Tool Path Parameters<\/h3><\/div><div><div>Adopt small cutting depth and multi-pass light feed milling:<\/div><\/div><div><ul><li>Reduce single cutting depth below 0.2mm for sheet under 3mm<\/li><li>Use climb milling instead of conventional milling to reduce workpiece pulling force<\/li><li>Avoid one-time full grooving on cabinet mounting boss areas<\/li><\/ul><\/div><div><h3>4. Add Local Reinforcement Structure (DFM Design Optimization)<\/h3><\/div><div><div>For key milling positions on thin cabinet shells, add small reinforcement ribs at the design stage. Enhanced local rigidity can almost eliminate milling deformation without increasing too much raw material cost.<\/div><\/div><div><h3>5. Separate Milling Process for Large Cabinet Assemblies<\/h3><\/div><div><div>For ultra-long BESS cabinet components that are prone to bending springback, split large workpieces into small modular units for independent CNC secondary milling, then complete overall assembly.<\/div><\/div><div><h2>Should You Use Secondary CNC Milling on Cabinet Sheet Metal?<\/h2><\/div><div><div>From the perspective of production cost and yield: <strong>secondary CNC milling is not necessary for most ordinary mounting holes<\/strong>.<\/div><\/div><div><div>We recommend replacing milled threaded holes with press-fit studs and clinch nuts for non-critical installation positions. Only retain precision CNC milling for load-bearing mating surfaces. This optimization can cut 70% secondary processing cost and completely avoid thin plate deformation risks.<\/div><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-117f91b7 e-con-full e-flex e-con e-child\" data-id=\"117f91b7\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-43abf3c3 elementor-widget elementor-widget-text-editor\" data-id=\"43abf3c3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<div data-page-id=\"GrZsdSrwFo8aLtxQbnuc0oqln6f\" data-lark-html-role=\"root\" data-docx-has-block-data=\"false\"><div class=\"ace-line ace-line old-record-id-Ujr2fgp8Id9gqUcfQJIc263hnGb\"><div class=\"ace-line ace-line old-record-id-Ujr2fgp8Id9gqUcfQJIc263hnGb\"><div><h2 style=\"text-align: center;\">FAQ\u00a0<\/h2><\/div><div><h3>Q1: What is the main reason for thin sheet metal CNC milling deformation?<\/h3><\/div><div><div>Low workpiece rigidity + residual stress from previous CNC bending process; unreasonable fixture clamping is the top external factor.<\/div><\/div><div><h3>Q2: Can bending springback affect subsequent CNC milling precision?<\/h3><\/div><div><div>Yes. Uncontrolled long panel bending springback will cause uneven milling datum plane, further enlarging finished product tolerance deviation.<\/div><\/div><div><h3>Q3: What material is least likely to deform during thin sheet CNC milling?<\/h3><\/div><div><div>Low-carbon cold rolled steel performs best; high-hardness stainless steel thin sheet has the highest deformation risk in secondary machining.<\/div><\/div><div><h3>Q4: Is vacuum fixture a must for precision thin sheet cabinet parts?<\/h3><\/div><div><div>For IP54\/IP65 grade energy storage enclosures, vacuum auxiliary fixtures are the most cost-effective configuration to guarantee batch dimensional consistency.<\/div><\/div><div><h2 style=\"text-align: center;\">Final Words<\/h2><\/div><div><div>Thin sheet deformation in secondary CNC milling is a linked process problem closely related to early CNC press brake bending quality. Whole-process CNC parameter matching is the core of high-yield BESS cabinet sheet metal production.<\/div><\/div><div><div>Send your cabinet CAD drawings to our engineering team, we provide free full-process DFM optimization report including bending compensation and anti-deformation milling scheme within 24 hours.<\/div><\/div><\/div><div class=\"ace-line ace-line old-record-id-Ujr2fgp8Id9gqUcfQJIc263hnGb\">\u00a0<\/div><div class=\"ace-line ace-line old-record-id-Ujr2fgp8Id9gqUcfQJIc263hnGb\"><strong>wendy@energystoragecabinetfactory.com<\/strong><\/div><div class=\"ace-line ace-line old-record-id-Ujr2fgp8Id9gqUcfQJIc263hnGb\"><strong>Tel: +86 157 6867 8219<\/strong><\/div><\/div><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-6c025d70 e-flex e-con-boxed e-con e-parent\" data-id=\"6c025d70\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div 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