{"id":17209,"date":"2024-03-18T17:37:13","date_gmt":"2024-03-18T09:37:13","guid":{"rendered":"https:\/\/firstmold.com\/?post_type=case-study&#038;p=17209"},"modified":"2026-03-30T15:00:48","modified_gmt":"2026-03-30T07:00:48","slug":"electric-scooter-wheel-hub-production-by-insert-molding-process","status":"publish","type":"case-study","link":"https:\/\/firstmold.com\/ar\/case-study\/electric-scooter-wheel-hub-production-by-insert-molding-process\/","title":{"rendered":"\u0625\u0646\u062a\u0627\u062c \u0645\u062d\u0648\u0631 \u0639\u062c\u0644\u0629 \u0627\u0644\u062f\u0631\u0627\u062c\u0629 \u0627\u0644\u0628\u062e\u0627\u0631\u064a\u0629 \u0627\u0644\u0643\u0647\u0631\u0628\u0627\u0626\u064a\u0629 \u0639\u0646 \u0637\u0631\u064a\u0642 \u0639\u0645\u0644\u064a\u0629 \u0627\u0644\u0635\u0628 \u0628\u0627\u0644\u0642\u0627\u0644\u0628"},"content":{"rendered":"<p>The rear electric scooter wheel hub has three key functions. Firstly, it serves as a structural load-bearing component. Secondly, it must be manufactured with precision dimensions, including an insert molded component, so that other components, like the electric scooter hub motor, can fit into it. Thirdly, it adds to the aesthetics of the scooter, just like automobile rims. The following considerations are necessary to achieve these goals.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><em>\u0627\u062e\u062a\u064a\u0627\u0631 \u0627\u0644\u0645\u0648\u0627\u062f:<\/em><\/strong> Due to the load-bearing requirement, high-strength engineering plastic like polyamide (PA6\/PA66) reinforced with fiberglass (GF) for stiffness is usually the preferred material. It has good wear and heat resistance, too.<\/li>\n\n\n\n<li><strong><em>Design optimization:<\/em><\/strong> This is necessary to prevent common defects like sink marks and warpage in electric scooter wheel hub manufacturing by maintaining consistent thickness. Ribs can also be added to increase strength without increasing thickness.<\/li>\n\n\n\n<li><strong><em>Mold design optimization:<\/em><\/strong> The electric scooter wheel hubmold design must optimize gate location, material flow path, and cooling channels to prevent defects. It should also have a provision for insert molding for steel or aluminum bearing housing.<\/li>\n\n\n\n<li><strong><em>Injection molding optimization:<\/em><\/strong> The injection molding of electric scooter wheel hub must optimize the molding parameters like melt temperature, mold temperature, injection speed, and holding time, depending on the material in use, to prevent degradation.<\/li>\n\n\n\n<li><strong><em>Structural integrity analysis:<\/em><\/strong> Finite Element Analysis (FEA) and Computer-Aided Engineering (CAE) are used to optimize hub support. The goal is to ensure the wheel can withstand repeated loads and impact.<\/li>\n\n\n\n<li><strong><em>Surface treatment and environmental adaptability:<\/em><\/strong> The surface treatment applied to the electric scooter wheel hub adds to its aesthetics. In addition to making the surface more appealing, the surface treatment should help the material to resist environmental elements like UV rays, temperature changes, and humidity for long-term stability.<\/li>\n\n\n\n<li><strong><em>Quality assurance:<\/em><\/strong> Electric scooter wheel hub production must implement a strict quality control process, from online inspection to process control and final product testing, to ensure the wheel hub meets design specifications and performance requirements.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-client-requirements\">\u0645\u062a\u0637\u0644\u0628\u0627\u062a \u0627\u0644\u0639\u0645\u064a\u0644<\/h2>\n\n\n\n<p>A well-known electric scooter manufacturer in China and a long-time friend of First Mold\u2019s General Manager, James Li, approached our facility for comprehensive plastic mold making and insert molding services for electric scooter wheel hub manufacturing.<\/p>\n\n\n\n<p>During the round table discussion to review the product blueprint and requirements, the client said, \u201cFirst Mold is one of the mold manufacturers in China that we greatly respect, because of how they have assisted many manufacturers in bringing complex ideas to life. And we are confident this project will not be an exception.\u201d<\/p>\n\n\n\n<p>In response, the company\u2019s Deputy General Manager, Ray Liu, said, \u201cFirst Mold has been privileged to have some of the smartest engineers in the country. Leveraging advanced technologies, there is no limit to what our team can achieve\u201d.<\/p>\n\n\n\n<p>&nbsp;The electric scooter wheel hub manufacturer wanted a production tooling that could handle PA6+30%GF. The surface of the electric scooter wheel hub mold should be polished enough to give a standard smooth surface to the molded part. The required tolerance for automated assembly was \u00b10.1mm. Also, the client wanted the mold to be optimized to prevent common defects.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-challenges-and-solutions\">\u0627\u0644\u062a\u062d\u062f\u064a\u0627\u062a \u0648\u0627\u0644\u062d\u0644\u0648\u0644<\/h2>\n\n\n\n<p>The electric scooter wheel hub manufacturer pointed out key critical concerns based on their previous experiences. This includes the shifting of the steel insert during material injection, inconsistent part tolerance that makes automated assembly difficult, and low production yield (\u226490%).<\/p>\n\n\n\n<p>Reacting to the concerns, Li said, \u201cEvery tool that leaves our facility passes through rigorous quality control screening to ensure they meet, and in most cases exceed, the customer\u2019s expectations.\u201d<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-insert-shifting-and-coaxiality-deviation\">Insert Shifting and Coaxiality Deviation<\/h3>\n\n\n\n<p>The central steel sleeve is the core of power transmission in electric scooters. During injection molding, the high-pressure molten plastic flow can impact the metal insert, causing shifting, tilting, and coaxiality deviation. If the deviation exceeds 0.05mm, the entire hub is scrapped and cannot be matched with the motor shaft.<\/p>\n\n\n\n<p>Most factories lack precision insert positioning tooling, leading to a high rate of steel sleeve shifting during mass production. Some of the possible outcomes from steel insert shifting include motor assembly jamming and abnormal noise.<\/p>\n\n\n\n<p>The best way to solve this problem is during the mold design. The team of First Mold engineers solved this problem using precision-machined pins in the electric scooter wheel hub mold to hold the steel sleeve in place. The outer surface of the steel sleeve was also modified to improve mechanical adhesion.<\/p>\n\n\n\n<p>To further prevent the shifting of the steel sleeve, the team optimized the injection speed and pressure to minimize the impact force of the molten resin on the insert. The gate location was optimized, too. The gate was positioned in such a way that the molten resin gently fills around the insert rather than pushing it.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-shrinkage-and-deformation-control-of-pa6-30-gf\">Shrinkage and Deformation Control of PA6 + 30% GF<\/h3>\n\n\n\n<p>Frequent issues reported with PA6+30GF include glass fiber blooming, shrinkage, and warpage. These problems lead to poor appearance and dimensional inconsistency. Consequently, the manufactured part will fail to pass high-end brand audits.<\/p>\n\n\n\n<p>Some of the defects reported with PA6 are due to its high water absorption. Insufficient drying before molding can lead to bubbles and cracking. However, the shrinkage rate fluctuates significantly after reinforcement with 30% glass fiber.<\/p>\n\n\n\n<p>In this electric scooter wheel hub project, the hub&#8217;s complex reinforcing ribs and grid structures, as well as uneven wall thickness, also cause inconsistent cooling shrinkage. This makes the part highly prone to warpage and deformation, which affects rim roundness and assembly accuracy.<\/p>\n\n\n\n<p>First Mold overcame these challenges through a combination of processes that include process parameter optimization and mold design improvements. This includes drying the PA6 + 30% GF at a temperature range of 80\u00b0C to 90\u00b0C (176\u00b0F &#8211; 194\u00b0F) for 4-6 hours before injection molding. The goal is to achieve a moisture content of 0.1%-0.2%.<\/p>\n\n\n\n<p>Additionally, the mold temperature was increased to the upper limit of the material\u2019s specification. The team also made the following mold design improvements:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Optimizing gating to facilitate flow and lower shear<\/li>\n\n\n\n<li>Proper venting, especially in areas where weld lines occur, to facilitate the removal of trapped air<\/li>\n\n\n\n<li>Utilizing thick and short runners and gates to prevent excessive shear on the material<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-insufficient-structural-strength\">Insufficient structural strength<\/h3>\n\n\n\n<p>The grid reinforcing ribs, toothed structures, and mounting holes in this electric scooter wheel hub project feature a deep-cavity, thin-walled, and dense rib design. During injection molding, this can easily lead to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Short shots (insufficient filling)<\/li>\n\n\n\n<li>Insufficient weld line strength, making stress areas prone to fracture<\/li>\n\n\n\n<li>Glass fiber blooming (fiber exposure), which affects appearance and weather resistance<\/li>\n<\/ul>\n\n\n\n<p>Weld lines are prone to fracture, creating safety hazards under bumpy road conditions and leading to customer returns and recalls. First Mold eliminated weld lines through thoughtful mold design and adjusting process parameters.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-stringent-tolerance-requirements-0-1mm\">Stringent Tolerance Requirements (\u00b10.1mm)<\/h3>\n\n\n\n<p>As the core transmission component, the electric scooter motor hub requires tight tolerances of \u00b10.1mm for coaxiality, mounting hole positions, and rim dimensions\u2014far higher than those of ordinary injection-molded parts. This poses a significant test for mold precision, injection molding processes, and inspection capabilities.<\/p>\n\n\n\n<p>Large dimensional fluctuations make it impossible to meet the \u00b10.1mm precision requirement, limiting use to only low-end manual assembly. Dimensional fluctuations can make it hard for the electric scooter hub motor components to fit seamlessly, resulting in part rejection.<\/p>\n\n\n\n<p>The team of First Mold engineers achieved the desired tolerance through design for manufacturability and by leveraging advanced hardware and software technologies. The mold design included uniform cooling channels and accounted for the specific shrinkage rate of PA6 + 30% GF. These interventions, combined with optimized processing conditions, helped the team to achieve a consistent \u00b10.1mm tolerance.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-balancing-efficiency-and-stability-in-single-cavity-mass-production-molds\">Balancing Efficiency and Stability in Single-Cavity Mass Production Molds<\/h3>\n\n\n\n<p>Single-cavity molds inherently have low efficiency. The situation was worsened by the hub\u2019s complex structure, which makes debugging extremely difficult. Some of the major challenges that industry peers face include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Frequent production shutdowns for mold adjustments<\/li>\n\n\n\n<li>Low yield and uncontrolled costs<\/li>\n\n\n\n<li>Inability to meet large-scale, stable supply demands<\/li>\n<\/ul>\n\n\n\n<p>These challenges usually stem from insufficient experience in single-cavity mold debugging. When the mass production yield is below 90%, it leads to delayed delivery and situations where costs will far exceed the budget. The team achieved a production yield above 95% by optimizing the cooling system, optimal gate design, and precise parameter tuning.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-what-the-client-gained-with-first-mold-s-solutions\">\u0645\u0627 \u0627\u0644\u0630\u064a \u0627\u0643\u062a\u0633\u0628\u0647 \u0627\u0644\u0639\u0645\u064a\u0644 \u0645\u0646 \u062d\u0644\u0648\u0644 \u0634\u0631\u0643\u0629 \u0641\u064a\u0631\u0633\u062a \u0645\u0648\u0644\u062f\u0632<\/h2>\n\n\n\n<p>The electric scooter wheel hub blueprint featured a complex design; the manufacturer faced the risk of being forced to redesign their product if they couldn\u2019t find a mold maker that would create the right tool. Product redesign takes a lot of time, and can be costly too. By working with First Mold, the client was able to avoid that eventuality.<\/p>\n\n\n\n<p>\u201cWe had already formed our marketing around the design in the blueprint,\u201d said the client when they received their tooling with test samples. \u201cChanging the design midway would have been a serious dent on our brand image and create distrust among our customers\u201d.<\/p>\n\n\n\n<p>First Mold did not just accept the electric scooter wheel hub mold manufacturing project, but also made sure the client received the working tool well ahead of the deadline. The collaboration also gives the client access to expedited maintenance and replacement parts.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-faq\">\u0627\u0644\u0623\u0633\u0626\u0644\u0629 \u0627\u0644\u0634\u0627\u0626\u0639\u0629<\/h2>\n\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1774853398098\"><strong class=\"schema-faq-question\">How Do You Prevent The Steel Sleeve From Shifting In Insert Molding For Electric Scooter Motor Hub?<\/strong> <p class=\"schema-faq-answer\">At the design level, mold makers can prevent the shifting of steel sleeves in insert molding using spring-loaded pins, magnetic holders, mechanical traps, shutoff surfaces, mechanical retention features, and interference fit. The exact technique used will often depend on design limitations.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1774854070906\"><strong class=\"schema-faq-question\">How Can You Increase The Yield Rate In Single-Cavity Insert Molding?<\/strong> <p class=\"schema-faq-answer\">Optimizing the insert design to prevent drifts during injection of the resin, mold design improvements like optimizing gating position and proper venting, and proper process optimization are all critical to improving the yield rate in a single-cavity electric scooter motor hub insert mold.<\/p> <\/div> <\/div>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"600\" height=\"400\" src=\"https:\/\/firstmold.com\/wp-content\/uploads\/2024\/03\/Manufacturing-of-automotive-wheels-by-injection-molding-process-using-insert-mold.webp\" alt=\"\u062a\u0635\u0646\u064a\u0639 \u0639\u062c\u0644\u0627\u062a \u0627\u0644\u0633\u064a\u0627\u0631\u0627\u062a \u0639\u0646 \u0637\u0631\u064a\u0642 \u0639\u0645\u0644\u064a\u0629 \u0627\u0644\u0642\u0648\u0644\u0628\u0629 \u0628\u0627\u0644\u062d\u0642\u0646 \u0628\u0627\u0633\u062a\u062e\u062f\u0627\u0645 \u0642\u0627\u0644\u0628 \u0627\u0644\u0625\u062f\u062e\u0627\u0644\" class=\"wp-image-17221\" srcset=\"https:\/\/firstmold.com\/wp-content\/uploads\/2024\/03\/Manufacturing-of-automotive-wheels-by-injection-molding-process-using-insert-mold.webp 600w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/03\/Manufacturing-of-automotive-wheels-by-injection-molding-process-using-insert-mold-300x200.webp 300w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/03\/Manufacturing-of-automotive-wheels-by-injection-molding-process-using-insert-mold-18x12.webp 18w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><figcaption class=\"wp-element-caption\">\u062a\u0635\u0646\u064a\u0639 \u0639\u062c\u0644\u0627\u062a \u0627\u0644\u0633\u064a\u0627\u0631\u0627\u062a \u0639\u0646 \u0637\u0631\u064a\u0642 \u0639\u0645\u0644\u064a\u0629 \u0627\u0644\u0642\u0648\u0644\u0628\u0629 \u0628\u0627\u0644\u062d\u0642\u0646 \u0628\u0627\u0633\u062a\u062e\u062f\u0627\u0645 \u0642\u0627\u0644\u0628 \u0627\u0644\u0625\u062f\u062e\u0627\u0644<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img decoding=\"async\" width=\"800\" height=\"533\" src=\"https:\/\/firstmold.com\/wp-content\/uploads\/2024\/03\/Workers-are-registering-the-number-of-completed-injection-molded-wheels-and-preparing-to-pack-boxes.webp\" alt=\"\u064a\u0633\u062c\u0644 \u0627\u0644\u0639\u0645\u0627\u0644 \u0639\u062f\u062f \u0627\u0644\u0639\u062c\u0644\u0627\u062a \u0627\u0644\u0645\u0635\u0628\u0648\u0628\u0629 \u0628\u0627\u0644\u062d\u0642\u0646 \u0627\u0644\u0645\u0643\u062a\u0645\u0644\u0629 \u0648\u064a\u0633\u062a\u0639\u062f\u0648\u0646 \u0644\u062a\u0639\u0628\u0626\u0629 \u0627\u0644\u0635\u0646\u0627\u062f\u064a\u0642\" class=\"wp-image-17220\" srcset=\"https:\/\/firstmold.com\/wp-content\/uploads\/2024\/03\/Workers-are-registering-the-number-of-completed-injection-molded-wheels-and-preparing-to-pack-boxes.webp 800w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/03\/Workers-are-registering-the-number-of-completed-injection-molded-wheels-and-preparing-to-pack-boxes-300x200.webp 300w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/03\/Workers-are-registering-the-number-of-completed-injection-molded-wheels-and-preparing-to-pack-boxes-768x512.webp 768w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/03\/Workers-are-registering-the-number-of-completed-injection-molded-wheels-and-preparing-to-pack-boxes-18x12.webp 18w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption class=\"wp-element-caption\">\u064a\u0633\u062c\u0644 \u0627\u0644\u0639\u0645\u0627\u0644 \u0639\u062f\u062f \u0627\u0644\u0639\u062c\u0644\u0627\u062a \u0627\u0644\u0645\u0635\u0628\u0648\u0628\u0629 \u0628\u0627\u0644\u062d\u0642\u0646 \u0627\u0644\u0645\u0643\u062a\u0645\u0644\u0629 \u0648\u064a\u0633\u062a\u0639\u062f\u0648\u0646 \u0644\u062a\u0639\u0628\u0626\u0629 \u0627\u0644\u0635\u0646\u0627\u062f\u064a\u0642<\/figcaption><\/figure>","protected":false},"excerpt":{"rendered":"<p>\u0627\u0633\u062a\u0643\u0634\u0641 \u062f\u0631\u0627\u0633\u0629 \u0627\u0644\u062d\u0627\u0644\u0629 \u0627\u0644\u062e\u0627\u0635\u0629 \u0628\u0646\u0627 \u0639\u0646 \u0625\u0646\u062a\u0627\u062c \u0645\u062d\u0648\u0631 \u0639\u062c\u0644\u0629 \u0627\u0644\u062f\u0631\u0627\u062c\u0629 \u0627\u0644\u0628\u062e\u0627\u0631\u064a\u0629 \u0628\u0627\u0633\u062a\u062e\u062f\u0627\u0645 \u0642\u0648\u0644\u0628\u0629 \u0627\u0644\u0625\u062f\u062e\u0627\u0644 \u0627\u0644\u0645\u062a\u0642\u062f\u0645\u0629. \u0627\u0643\u062a\u0634\u0641 \u0643\u064a\u0641 \u0646\u062d\u0642\u0642 \u062f\u0642\u0629 \u0641\u0627\u0626\u0642\u0629.<\/p>","protected":false},"author":2,"featured_media":17219,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"case-study-category":[66],"case-study-tag":[78],"class_list":["post-17209","case-study","type-case-study","status-publish","has-post-thumbnail","hentry","case-study-category-injection-molding-cases","case-study-tag-tools-and-equipment"],"acf":{"photo_gallery":{"case_study_gallery":[[{"id":17219,"title":"scooter wheel hub by insert injection molding service","caption":"scooter wheel hub by insert injection molding 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