{"id":2925,"date":"2026-04-20T03:25:36","date_gmt":"2026-04-20T03:25:36","guid":{"rendered":"https:\/\/www.advantage.co.th\/?p=2925"},"modified":"2026-04-20T03:26:34","modified_gmt":"2026-04-20T03:26:34","slug":"reducing-scrap-and-ng-in-automotive-spare-parts-manufacturing-a-quality-driven-approach","status":"publish","type":"post","link":"https:\/\/www.advantage.co.th\/en\/reducing-scrap-and-ng-in-automotive-spare-parts-manufacturing-a-quality-driven-approach\/","title":{"rendered":"Understanding Scrap and NG in Automotive Manufacturing"},"content":{"rendered":"\n<p>In automotive spare parts manufacturing\u2014whether producing <strong>engine components, wiring harnesses, plastic parts, or machined parts<\/strong>\u2014scrap and NG are critical indicators of process health.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">\u2699\ufe0f Major Processes Where Scrap and NG Occur<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83d\udfe0 1. Incoming Material Inspection (IQC)<\/h2>\n\n\n\n<p><strong>Common Issues:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Dimensional variation in raw materials<\/li>\n\n\n\n<li>Surface defects (rust, contamination)<\/li>\n\n\n\n<li>Incorrect material grade<\/li>\n<\/ul>\n\n\n\n<p><strong>Impact:<\/strong><br>Poor incoming quality leads to <strong>defect multiplication across the production line<\/strong>.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83d\udd34 2. Machining Processes (CNC, Turning, Milling)<\/h2>\n\n\n\n<p><strong>Typical NG\/Scrap:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Out-of-tolerance dimensions<\/li>\n\n\n\n<li>Poor surface finish<\/li>\n\n\n\n<li>Tool marks or chatter<\/li>\n<\/ul>\n\n\n\n<p><strong>Root Causes:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Tool wear or breakage<\/li>\n\n\n\n<li>Improper machine calibration<\/li>\n\n\n\n<li>Incorrect cutting parameters<\/li>\n<\/ul>\n\n\n\n<p>\ud83d\udc49 This is one of the <strong>highest scrap-generating areas<\/strong> in metal component manufacturing.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83d\udd34 3. Casting and Forging<\/h2>\n\n\n\n<p><strong>Common Defects:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Porosity and blowholes<\/li>\n\n\n\n<li>Cracks or incomplete filling<\/li>\n\n\n\n<li>Shrinkage defects<\/li>\n<\/ul>\n\n\n\n<p><strong>Root Causes:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Improper mold design<\/li>\n\n\n\n<li>Temperature variation<\/li>\n\n\n\n<li>Material inconsistency<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83d\udd34 4. Injection Molding (Plastic Components)<\/h2>\n\n\n\n<p><strong>Common NG:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Warpage<\/li>\n\n\n\n<li>Sink marks<\/li>\n\n\n\n<li>Short shots<\/li>\n<\/ul>\n\n\n\n<p><strong>Root Causes:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Incorrect mold temperature<\/li>\n\n\n\n<li>Poor cooling design<\/li>\n\n\n\n<li>Material flow imbalance<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83d\udd34 5. Heat Treatment<\/h2>\n\n\n\n<p><strong>Typical Issues:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Hardness variation<\/li>\n\n\n\n<li>Distortion<\/li>\n\n\n\n<li>Cracks<\/li>\n<\/ul>\n\n\n\n<p><strong>Root Causes:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Improper heating\/cooling cycles<\/li>\n\n\n\n<li>Furnace inconsistency<\/li>\n\n\n\n<li>Incorrect loading pattern<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83d\udd34 6. Surface Treatment &amp; Coating<\/h2>\n\n\n\n<p><strong>Common NG:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Poor adhesion<\/li>\n\n\n\n<li>Uneven coating thickness<\/li>\n\n\n\n<li>Corrosion spots<\/li>\n<\/ul>\n\n\n\n<p><strong>Root Causes:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Inadequate surface cleaning<\/li>\n\n\n\n<li>Chemical imbalance<\/li>\n\n\n\n<li>Process contamination<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83d\udd34 7. Assembly Line<\/h2>\n\n\n\n<p><strong>Frequent Defects:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Missing or wrong parts<\/li>\n\n\n\n<li>Improper torque application<\/li>\n\n\n\n<li>Misalignment<\/li>\n<\/ul>\n\n\n\n<p><strong>Root Causes:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Human error<\/li>\n\n\n\n<li>Lack of poka-yoke systems<\/li>\n\n\n\n<li>Inadequate work instructions<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83d\udfe3 8. Testing &amp; Final Inspection<\/h2>\n\n\n\n<p><strong>Issues:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Functional failures<\/li>\n\n\n\n<li>Leakage in components<\/li>\n\n\n\n<li>Electrical faults (for electronic parts)<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">\ud83d\udcca Key Causes of Scrap and NG<\/h1>\n\n\n\n<p>Across all processes, major contributing factors include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Lack of process control and monitoring<\/li>\n\n\n\n<li>Inadequate training and skill gaps<\/li>\n\n\n\n<li>Poor maintenance of machines<\/li>\n\n\n\n<li>Weak supplier quality management<\/li>\n\n\n\n<li>Ineffective use of quality tools<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n","protected":false},"excerpt":{"rendered":"<p>In automotive spare parts manufacturing\u2014whether producing engine components, wiring harnesses, plastic parts, or machined parts\u2014scrap and NG are critical indicators of process health. \u2699\ufe0f Major Processes Where Scrap and NG Occur \ud83d\udfe0 1. Incoming Material Inspection (IQC) Common Issues: Impact:Poor incoming quality leads to defect multiplication across the production line. \ud83d\udd34 2. Machining Processes (CNC, [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":2473,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[15,26],"tags":[227,82,228,287,85,79,83,288],"class_list":["post-2925","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-boi-scrap","category-knowledge","tag-environmental-compliance-needed","tag-led-lighting","tag-machine-breakdown","tag-machining-processes-cnc","tag-material-and-workmanship","tag-technical-and-performance-validation","tag-third-party-inspection-service","tag-turning"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Understanding Scrap and NG in Automotive Manufacturing - Advantage<\/title>\n<meta name=\"description\" content=\"In automotive spare parts manufacturing, scrap and NG are not just production issues\u2014they are strategic quality indicators. 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