Research on Effect of Powder Particle Size on Quality Performance of MIM Small Module Gears

Zhong Zhicheng; Pan Chunrong; Lin Ling; Ren Jihua

doi:10.16578/j.issn.1004.2539.2023.12.021

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Research on Effect of Powder Particle Size on Quality Performance of MIM Small Module Gears

Development·Application | 更新时间：2023-12-21

- Research on Effect of Powder Particle Size on Quality Performance of MIM Small Module Gears
- Journal of Mechanical Transmission Vol. 47, Issue 12, Pages: 146-152(2023)
- 作者机构：
  
  1.江西理工大学机电工程学院，江西赣州 341000
  2.赣南科技学院智能制造与汽车工程学院，江西赣州 341000
  3.江苏精研科技股份有限公司，江苏常州 213023
- 作者简介：
- 基金信息：
- DOI：10.16578/j.issn.1004.2539.2023.12.021
  CLC：
- Published：15 December 2023，
  
  Received：04 May 2023，
  
  Revised：19 July 2023，
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钟志丞,潘春荣,林玲等.粉末粒径对MIM小模数齿轮质量性能的影响研究[J].机械传动,2023,47(12):146-152.

Zhong Zhicheng,Pan Chunrong,Lin Ling,et al.Research on Effect of Powder Particle Size on Quality Performance of MIM Small Module Gears[J].Journal of Mechanical Transmission,2023,47(12):146-152.
钟志丞,潘春荣,林玲等.粉末粒径对MIM小模数齿轮质量性能的影响研究[J].机械传动,2023,47(12):146-152. DOI： 10.16578/j.issn.1004.2539.2023.12.021.

Zhong Zhicheng,Pan Chunrong,Lin Ling,et al.Research on Effect of Powder Particle Size on Quality Performance of MIM Small Module Gears[J].Journal of Mechanical Transmission,2023,47(12):146-152. DOI： 10.16578/j.issn.1004.2539.2023.12.021.

摘要

采用金属粉末注射成形（Metal powder Injection Molding，MIM）工艺研制小模数齿轮，为改善齿轮烧结件的质量性能，采用不同粒径的粉末进行制备；采用熔体流速测定仪、孔隙率测定软件、2.5次元影像测量仪和显微维氏硬度计等分析齿轮的烧结性能，研究了粉末粒径对齿轮表面质量、孔隙率和收缩率的影响机制。结果表明，5.0 μm粉末制备的齿轮，粉末流动性能差，烧结后粉末浓度分布不均匀，表面存在黑线，并且尺寸收缩不均匀，影响尺寸精度；9.0 μm粉末制备的齿轮，烧结颈形成能力差，扩散机制进程滞缓，导致烧结后孔隙率高，孔隙尺寸大；采用7.0 μm粉末制备齿轮时，齿轮的质量性能最好，齿轮不存在表面缺陷，孔隙率降至2.9 %，维氏硬度值达到355，收缩率均匀性高，尺寸精度高，所检项目精度等级在GB 2363—1990标准下均高于7级。

Abstract

When using the process of metal powder injection molding (MIM) to prepare small module gears

in order to improve the quality and performance of the sintered parts of the gear

powder with different particle sizes is prepared. The sintering performance of the gear is analyzed by the melt flow meter

the porosity measurement software

the 2.5-dimensional image measuring instrument and the micro-Vickers hardness tester. The influence mechanism of particle sizes on the surface quality

porosity and shrinkage of gears is studied. The results show that due to the poor powder flow performance of the gear made of 5.0 μm powder

the powder concentration distribution is not uniform after sintering

there are black lines on the surface

and the dimensional shrinkage is not uniform

which affect the dimensional accuracy. Due to the poor sintering neck formation ability and slow diffusion process of the gear made of 9.0 μm powder

the porosity after sintering is high and the pore size is large. When the 7.0 μm powder is used to prepare the gear

the quality performance of the gear is the best. The gear has no surface defects

the porosity is reduced to 2.9%

the Vickers hardness value reaches 355

the shrinkage uniformity is high

the dimensional accuracy is high

and the accuracy of thetested items are better than class 7 according to the national standard GB 2363—1990.

关键词

金属粉末注射成形粉末粒径表面质量孔隙率收缩率

Keywords

Metal powder injection molding（MIM）Powder particle sizeSurface qualityPorosityShrinkage

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