{"id":919,"date":"2025-06-20T11:27:19","date_gmt":"2025-06-20T03:27:19","guid":{"rendered":"https:\/\/reliablecncmachining.com\/?p=919"},"modified":"2025-06-20T11:27:19","modified_gmt":"2025-06-20T03:27:19","slug":"tapping-process-techniques-for-cnc-machining-of-automotive-parts","status":"publish","type":"post","link":"https:\/\/reliablecncmachining.com\/fr\/tapping-process-techniques-for-cnc-machining-of-automotive-parts\/","title":{"rendered":"Tapping process techniques for CNC machining of automotive parts"},"content":{"rendered":"<p>The tapping process of automotive parts in <a href=\"https:\/\/reliablecncmachining.com\/fr\/\" data-internallinksmanager029f6b8e52c=\"1\" title=\"Chez Reliable CNC Machining, votre succ\u00e8s est notre priorit\u00e9. Avec une \u00e9quipe r\u00e9active 24h\/24 et 7j\/7, nous garantissons une r\u00e9ponse dans les 4 heures \u00e0 toute demande\u2026\">CNC machining<\/a> needs to be comprehensively optimized from aspects such as tool selection, parameter setting, cooling and lubrication, process control and quality inspection. The following are the key techniques and implementation points:<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_73 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Basculer la table des mati\u00e8res\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/reliablecncmachining.com\/fr\/tapping-process-techniques-for-cnc-machining-of-automotive-parts\/#First_tool_selection_and_pretreatment\" title=\"First, tool selection and pretreatment\">First, tool selection and pretreatment<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/reliablecncmachining.com\/fr\/tapping-process-techniques-for-cnc-machining-of-automotive-parts\/#Second_cooling_lubrication_and_chip_removal_control\" title=\"Second, cooling lubrication and chip removal control\">Second, cooling lubrication and chip removal control<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/reliablecncmachining.com\/fr\/tapping-process-techniques-for-cnc-machining-of-automotive-parts\/#Third_quality_inspection_and_problem_handling\" title=\"Third, quality inspection and problem handling\">Third, quality inspection and problem handling<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/reliablecncmachining.com\/fr\/tapping-process-techniques-for-cnc-machining-of-automotive-parts\/#Fourth_verification_of_typical_cases\" title=\"Fourth, verification of typical cases\">Fourth, verification of typical cases<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"First_tool_selection_and_pretreatment\"><\/span>First, tool selection and pretreatment<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Tool material matching<\/p>\n<p>Select tool coatings for different materials:<\/p>\n<p>High-strength steel (such as 42CrMo) requires TiAlN-coated taps to enhance wear resistance and heat resistance (up to 800\u2103).<\/p>\n<p>Aluminum alloy is recommended to use uncoated high-speed steel taps to prevent aluminum shavings from adhering. Combined with a helical groove design (groove Angle 30\u00b0-45\u00b0), the chip removal efficiency can be improved.<\/p>\n<p>The thread tolerance grade should match the workpiece: for instance, when a 6H grade tap is selected for an M8\u00d71.25 thread, the hole diameter should be controlled within \u03a67.737-7.775mm.<\/p>\n<p>Tool pre-adjustment and inspection<\/p>\n<p>Before tapping, the tap runout needs to be calibrated. The end face runout should be \u22640.01mm and the axial runout \u22640.02mm.<\/p>\n<p>Check the integrity of the tap\u2019s cutting edge. The width of the cutting edge band should be uniform (for example, the width of the M10 tap\u2019s cutting edge band is 0.15-0.2mm) to avoid local wear causing random threading.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Second_cooling_lubrication_and_chip_removal_control\"><\/span>Second, cooling lubrication and chip removal control<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Selection of cooling method<\/p>\n<p>Micro Lubrication (MQL) : Suitable for aluminum alloy tapping, with an oil mist flow rate of 50-100 mL \/h, reducing adhered chips.<\/p>\n<p>Internal cooling tapping: For stainless steel\/titanium alloy, oil mist internal cooling (pressure 0.5-0.8MPa) is adopted. The coolant is sprayed out from the center hole of the tap and directly hits the cutting area.<\/p>\n<p>Intermittent cooling: When tapping to 2\/3 of the depth, pause the cooling for 0.5 seconds to utilize the thermal expansion and contraction effect to reduce the cutting force.<\/p>\n<p>Chip removal path optimization<\/p>\n<p>The helix Angle of the helical groove tap needs to match the material:<\/p>\n<p>For brittle materials such as cast iron, use a small helix Angle (15\u00b0-25\u00b0) to prevent chip blockage.<\/p>\n<p>Large helix angles (35\u00b0-45\u00b0) are used for steel parts to enhance chip removal capacity.<\/p>\n<p>When tapping blind holes, reserve a 0.5-1mm tool withdrawal groove at the bottom of the hole to prevent chip accumulation.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Third_quality_inspection_and_problem_handling\"><\/span>Third, quality inspection and problem handling<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Thread detection method<\/p>\n<p>Pass and stop gauge inspection: If the pass gauge is fully passed and the stop gauge does not exceed two turns, it is considered qualified.<\/p>\n<p>Three-needle measurement: Measure the M value to verify the median diameter, with an allowable error of \u00b10.04mm.<\/p>\n<p>Microhardness testing: The surface hardness of the thread should be 10%-15% higher than that of the base material to ensure wear resistance.<\/p>\n<p>Common Problem Handling<\/p>\n<p>Thread misalignment<\/p>\n<p>Reasons: The main shaft is not synchronized with the Z-axis, and the tap is worn.<\/p>\n<p>Measures: Calibrate the synchronization accuracy of the machine tool and replace the worn taps.<\/p>\n<p>Tap breakage<\/p>\n<p>Reasons: Excessive cutting force and insufficient cooling.<\/p>\n<p>Measure: Reduce the rotational speed to 80% of the calculated value and switch to internal cooling taps instead.<\/p>\n<p>Poor surface roughness<\/p>\n<p>Reason: Rough bottom hole, insufficient coolant.<\/p>\n<p>Measures: Pre-process the bottom hole to Ra1.6\u03bcm and increase the coolant flow rate to 15L\/min.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Fourth_verification_of_typical_cases\"><\/span>Fourth, verification of typical cases<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Tapping of the M14 thread of a certain automotive engine block:<\/p>\n<p>The original process adopted ordinary taps with a rotational speed of 200r\/min, and the thread qualification rate was only 75%. After optimization:<\/p>\n<p>Switch to TiALN-coated helical groove taps;<\/p>\n<p>The rotational speed is reduced to 160r\/min, and the feed rate is 280mm\/min.<\/p>\n<p>Cooperate with the internal cooling oil mist (pressure 0.6MPa).<\/p>\n<p>Result: The qualified rate of threads has increased to 98%, and the processing time per piece has been shortened by 12%.<\/p>\n<p>Thread tapping of blind hole M10 in a certain transmission housing:<\/p>\n<p>The original process hole depth is 18mm, and the tap is prone to breakage. After optimization:<\/p>\n<p>Tap in two sections (the first section is 12mm deep and the second section is full depth);<\/p>\n<p>Add intermittent cooling (tapping for 1 second \u2192 pause for 0.3 seconds \u2192 continue).<\/p>\n<p>Result: The service life of taps increased from 15 pieces to 50 pieces, and the scrap rate decreased from 8% to 1.5%.<\/p>\n<p>Through the systematic application of the above process techniques, the efficiency, accuracy and tool life of tapping for automotive parts can be significantly improved, while the quality risks can be reduced. In actual production, dynamic adjustments need to be made based on the material properties, equipment capacity and processing batch.<\/p>","protected":false},"excerpt":{"rendered":"<p>Le processus de taraudage des pi\u00e8ces automobiles dans l'usinage CNC doit \u00eatre optimis\u00e9 de mani\u00e8re globale \u00e0 partir d'aspects tels que la s\u00e9lection des outils, le r\u00e9glage des param\u00e8tres, le refroidissement et la lubrification, le contr\u00f4le du processus et l'inspection de la qualit\u00e9. Voici les techniques cl\u00e9s et les points de mise en \u0153uvre: Premi\u00e8rement, la s\u00e9lection des outils et le pr\u00e9traitement Correspondance des mat\u00e9riaux d'outils S\u00e9lectionnez les rev\u00eatements d'outils pour diff\u00e9rents mat\u00e9riaux: Acier haute r\u00e9sistance [\u2026]<\/p>","protected":false},"author":1,"featured_media":719,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[84],"class_list":["post-919","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-cnc-machining-of-automotive-parts"],"acf":[],"_links":{"self":[{"href":"https:\/\/reliablecncmachining.com\/fr\/wp-json\/wp\/v2\/posts\/919","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/reliablecncmachining.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/reliablecncmachining.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/reliablecncmachining.com\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/reliablecncmachining.com\/fr\/wp-json\/wp\/v2\/comments?post=919"}],"version-history":[{"count":0,"href":"https:\/\/reliablecncmachining.com\/fr\/wp-json\/wp\/v2\/posts\/919\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/reliablecncmachining.com\/fr\/wp-json\/wp\/v2\/media\/719"}],"wp:attachment":[{"href":"https:\/\/reliablecncmachining.com\/fr\/wp-json\/wp\/v2\/media?parent=919"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/reliablecncmachining.com\/fr\/wp-json\/wp\/v2\/categories?post=919"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/reliablecncmachining.com\/fr\/wp-json\/wp\/v2\/tags?post=919"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}