| Fabrication of micro gear wheels by micropowder injection molding |
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| 作者单位： | Haiqing Yin，Xuanhui Qu，and Chengchang Jia School of Materials Science and Engineering，University of Science and Technology Beijing，Beijing 100083，China |
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| 基金项目： | 国家重点基础研究发展计划(973计划)，国家高技术研究发展计划(863计划)，Program of the Ministry of Education of China for Chang]iang Scholars and Innovative Research Team in Universities |
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| 摘 要： | The micropowder injection molding technology was investigated to fabricate the microsized gear wheels on a conventional injection molding machine. The feedstock comprised of carbonyl ferrum powder and a wax-based thermoplastic binder. Microinjection molding was fulfilled at about 423 K under 100 MPa. The heating system was applied to the die to improve the fluidity of the feedstock and subsequently the cooling system was used to enhance the strength of the green compacts after injection by decreasing the temperature of the die. The gear wheels were realized successfully with their addendum circle diameter ranging from 800 to 200 μm and with the center hole as small as 60 μm.
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| 关 键 词： | 微齿轮 微粉喷射造型法 热塑性粘结剂 加热系统 |
| 收稿时间： | 15 September 2007 |
Fabrication of micro gear wheels by micropowder injection molding |
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| Authors: | Haiqing Yin Xuanhui Qu Chengchang Jia |
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| Affiliation: | School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China |
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| Abstract: | The micropowder injection molding technology was investigated to fabricate the microsized gear wheels on a conventional injection molding machine. The feedstock comprised of carbonyl ferrum powder and a wax-based thermoplastic binder. Microinjection molding was fulfilled at about 423 K under 100 MPa. The heating system was applied to the die to improve the fluidity of the feedstock and subsequently the cooling system was used to enhance the strength of the green compacts after injection by decreasing the temperature of the die. The gear wheels were realized successfully with their addendum circle diameter ranging from 800 to 200 m and with the center hole as small as 60 μtm. |
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| Keywords: | micropowder injection molding gear wheel thermoplastic binder heating system |
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