粉末微注射成形制备钟表用启步齿轮的技术研究  

Study on Micro-powder Injection Molding(μPIM) Prepared by Clock Micro-gear

作　　者：骆接文[1] 陈强[1] 蔡一湘[1] 谭立新[1] 

机构地区：[1]广州有色金属研究院,广东广州510640

出　　处：《热加工工艺》2011年第19期189-191,195,共4页Hot Working Technology

摘　　要：采用粉末微注射成型(μPIM)技术制备微型齿轮。在模具方面,就模具的分型面、拔模斜度、浇注系统以及顶出系统等几个关键问题进行了优化设计;粘结剂方面,采用EVA制备PP-PE-Pw-EVA-Mw-Sa粘结剂体系,通过测试其TG-DSC曲线,发现此体系混炼的较好,组分与组分之间互溶性良好,熔化温度之间衔接良好,不会出现温度"断裂"的现象;在注射成型工艺方面,对注射成型压力、速率、温度、顶出速率等工艺参数进行了研究,制备了缺陷率低的毛坯;并根据粘结剂、粉末的特性制定了合适的脱脂烧结工艺,最终成功的制备了最小尺寸为315微米性能良好的微型齿轮,为μPIM技术在制备微型零部件领域提供了技术支持。Micro-powder injection molding（μPIM） was used to prepare micro-gear.The molds parting surface,draft angle,gating system and ejection system,and several other mold problems were discussed.the PP-PE-Pw-EVA-Mw-Sa binder system was used for μPIM by testing its TG-DSC curves.The results indicate that the system performs good mixing miscibility,the ＂break＂ phenomenon do not appear at fusion temperature;in the injection molding process,the pressures of injection molding,rate,temperature,ejection rate and other parameters were studied;according to the binder and powder characteristics,the debinding and sintering process was carried out,the performance of micro-gear with minimum size of 315 μm was successfully prepared,which can provide μPIM field in preparing micro-components technical support.

关 键 词：粉末微注射成型技术 齿轮 超微型零件制备 

分 类 号：TF804.3[冶金工程—有色金属冶金]