含字符按键的双色塑件的注塑模设计  

Special glue feeding design of injection mold based on two⁃color keys

作　　者：赵利平[1] 侯贤州 秦瑞亮 叶卫文 彭新华 ZHAO Liping;HOU Xianzhou;QIN Ruiliang;YE Weiwen;PENG Xinhua(College of Mechanical and Electrical Engineering of Guangdong University of Science and Technology,Dongguan 523000,China;Maoxin hardware(Shenzhen)Co,Ltd,Shenzhen 518106,China)

机构地区：[1]广东科技学院机电工程学院,广东东莞523000 [2]茂新五金(深圳)有限公司,广东深圳518106

出　　处：《中国塑料》2023年第3期98-102,共5页China Plastics

基　　金：东莞市科技特派员项目(20221800500722);2022东莞市工程技术研究中心专项《现代模具设计与制造工程技术研究中心》。

摘　　要：根据双色按键塑件材质的结构特点及生产要求,设计了一套双色注塑模具。通过一次注射为塑件主体聚碳酸酯(PC)材质,针对塑件结构上设置的多处薄壁状骨位填充困难及注射压力过大的问题,模具采用细水口多点进胶的方式解决;二次注射为塑件外观面热塑性弹性体(TPE)软胶材质,优化设计的3点细水口通过滑块抽芯机构转后模垂直翻转搭底进胶的方式配合排气槽、排气针和排气镶件结构,解决外观表面无法进胶和TPE材质易困气产生流痕、气纹和结合线的问题;特殊的后模浮板结构解决了产品上字母R/e/o/a及中间环形圈封闭的孤岛进胶问题。经过实际生产验证,一次注射时完整的填充注射压力减少了16%,二次注射时未出现流痕、气纹和结合线不良,产品成型质量良好,模具设计达到实际生产的要求。A two⁃color injection mold was designed according to the structural characteristics and production requirements of the two⁃color key plastic parts.The main body of the plastic part was made of a PC material through one⁃step injec⁃tion.In view of the difficulty in the filling of many thin⁃walled bone positions set on the plastic part structure as well as the problem of excessive injection pressure,a method of fine nozzle multi⁃point glue injection was adaptable for this mold to address these problems.The secondary injection was conducted using TPE soft glue on the appearance surface of the plastic part.A slider core⁃pulling mechanism was employed for the optimized design of the three⁃point fine nozzle to turn the back mold vertically to flip and overlap the bottom to inject glue.This operation was cooperated with the exhaust slot,exhaust needle and exhaust insert structure to solve the problems of the inability to inject glue on the appearance sur⁃face and the TPE material being prone to trap air,which led to flow marks,air lines,and bonding lines.The special floating plate structure of the rear mold solved the problem of the isolated island glue feeding of the letter R/e/o/a on the product and the closed middle annular ring.Through actual production verification,the complete filling injection pressure was reduced by 16%during the first injection,and there were no flow marks,air lines and poor bonding lines found dur⁃ing the second injection.The molding quality of products was satisfactory,and the mold design could meet the require⁃ment of practical production.

关 键 词：双色按键 细水口 浮板结构 排气槽 排气针 排气镶件 

分 类 号：TQ320.662[化学工程—合成树脂塑料工业]