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| T2紫铜微传动件精密体积成形研究 |
| Precision Micro Massive Forming of T2 Copper Micro Transmission Parts |
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| DOI：10.3969/j.issn.1674-6457.2022.08.001 |
| 中文关键词: T2紫铜 微传动件 体积微成形 高温模锻 |
| 英文关键词: T2 copper micro transmission parts micro massive forming high temperature forging |
| 基金项目:国家自然科学基金(51705333) |
| Author Name | Affiliation | | WANG Bei | Shenzhen Key Laboratory of High Performance Nontraditional Manufacturing, College of Mechatronics and Control Engineering, Shenzhen University, Guangdong Shenzhen 518060, China | | YAN Chao | Shenzhen Key Laboratory of High Performance Nontraditional Manufacturing, College of Mechatronics and Control Engineering, Shenzhen University, Guangdong Shenzhen 518060, China | | RAN Jia-qi | Shenzhen Key Laboratory of High Performance Nontraditional Manufacturing, College of Mechatronics and Control Engineering, Shenzhen University, Guangdong Shenzhen 518060, China | | GONG Feng | Shenzhen Key Laboratory of High Performance Nontraditional Manufacturing, College of Mechatronics and Control Engineering, Shenzhen University, Guangdong Shenzhen 518060, China |
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| 中文摘要: |
| 目的 研究微传动件的体积成形过程，以制备出尺寸精度更高、力学性能更优的微传动件。方法 通过单向压缩试验，研究晶粒尺寸、加载速度、成形温度对T2紫铜力学性能的影响规律。通过微模锻试验，研究不同退火态试样对微齿轮填充性能的影响，以及成形温度对微齿轮尺寸精度和力学性能的影响。利用光学显微镜、超景深显微镜、扫描电子显微镜对材料组织、模具质量和成形结果进行表征。结果 随着退火温度的升高，T2紫铜的晶粒尺寸逐渐增大，维氏硬度逐渐降低。在微齿轮填充过程中存在明显的填充尺寸效应，600 ℃退火态试样填充效果最好。高温模锻获得的微齿轮齿顶圆平均直径为2 800.9 μm，与理论值2 800 μm仅相差+0.9 μm，而常温模锻获得的微齿轮齿顶圆平均直径为2 761.2 μm，与理论值2 800 μm相差−38.8 μm。与常温模锻成形的微齿轮相比，高温模锻成形的微齿轮尺寸精度得到了极大提高，但硬度出现了不同程度的降低。结论 随着晶粒尺寸的增大、加载速度的降低和成形温度的升高，T2紫铜的流动应力逐渐降低。600 ℃退火态试样填充性能最好，高温模锻可以成形出尺寸精度更高的微传动件，但其力学性能有所降低。最后，成功装配出可以平稳传动的微传动装置。 |
| 英文摘要: |
| The work aims to study the micro massive forming, so as to prepare micro transmission parts with higher dimensional accuracy and better mechanical properties. Through the unidirectional compression tests, the effect of grain size, loading speed, and forming temperature on the mechanical properties of T2 copper was studied. Through the forging test, the effect of different annealing samples on the filling performance of micro gears was studied. Then, the effect of forming temperature on the dimensional accuracy and mechanical properties of micro gears was also investigated. The material structure, mold quality and forming result were characterized by optical microscope, super depth of field microscope and scanning electron microscope. With the increase of annealing temperature, the grain size of T2 copper increased gradually, and the Vickers hardness decreased gradually. There was obvious filling size effect in the micro gear filling process, and the annealing sample at 600 ℃ had the best filling effect. The average diameter of micro gear tip circle obtained by high temperature forging was 2 800.9 μm, which was only +0.9 μm different from the theoretical value of 2 800 μm, while the average diameter of micro gear tip circle obtained by room temperature forging was 2 761.2 μm, which was −38.8 μm different from the theoretical value of 2 800 μm. Compared with the micro gears formed by forging at room temperature, the dimensional accuracy of the micro gears formed by forging at high temperature was greatly improved, but the hardness was reduced to different degrees. As the grain size increases, the loading speed decreases and the deformation temperature increases, the flow stress of T2 copper decreases to varying degrees. The filling performance of annealing samples at 600 ℃ is the best, and high temperature forging can form micro transmission parts with higher dimensional accuracy, but lower mechanical properties. Finally, the micro transmission devices which can drive smoothly are successfully assembled. |
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