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
骆接文， 陈 强， 蔡一湘， 谭立新
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作者单位：(广州有色金属研究院， 广东 广州 510640)
中文关键字：粉末微注射成型技术； 齿轮； 超微型零件制备
英文关键字：micro-powder injection molding; micro-gear; preparing micro-components
中文摘要：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。
英文摘要：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.