活动铅笔的塑料三开花夹头及模具结构  

Plastic Three Blossom Collet and Mold Structure of Mechanical Pencil

作　　者：洪跃 钱海平 吴瑛戟 Hong Yue;Qian Haiping;Wu Yingji(Shanghai M&G Stationery Inc.,Shanghai,201406;Shanghai Pen Technology Services Co.,LTD.Shanghai,201615)

机构地区：[1]上海晨光文具股份有限公司,上海201406 [2]上海制笔技术服务有限公司,上海201615

出　　处：《中国制笔》2021年第1期24-27,共4页China Writing Instruments

摘　　要：活动铅笔的夹头通常是塑料二开花夹头和金属三开花夹头,塑料二开花夹头易造成夹偏铅芯,金属三开花夹头加工工艺复杂,生产周期长,效率产能低,制造成本高。文章介绍了塑料三开花夹头研发的关键技术,对所用的聚甲醛材料进行了改性,提升了材料性能;模具结构上也进行了创新,将流道潜伏式浇口运用在哈夫模的结构中,并指出了模具设计中需要把握的技术关键点。塑料三开花夹头与二开花夹头相比夹铅芯力显著提高,并成功克服了二开花夹头容易夹偏铅芯的缺陷,应用前景看好。The mechanical pencil collet is usually a plastic two blossom collet and a metal three blossom collet.The two blossom collet is prone to lead deviation,and the metal three blossom collet has complex processing technology,long production cycle,low efficiency and productivity,and high manufacturing cost.This paper introduces the key technology of the research and development of the plastic three blossom collet.The POM material used is modified to improve the material performance.The structure of the mold is also innovated.The runner latent gate is used in the structure of the half mold,and the key technical points in the mold design are pointed out.Compared with the two blossom collet,the clamping force of the three blossom collet is significantly improved,and the defect that the two blossom collet is easy to clamp the lead offset is successfully overcome.The application prospect is good.

关 键 词：活动铅笔 夹头 模具 

分 类 号：TG7[金属学及工艺—刀具与模具]