摘要
【目的】为提高小模数齿轮的精度,以420不锈钢粉末为原料,采用金属粉末注射成形(Metal powder Injection Molding,MIM)工艺,在1330~1360℃的烧结温度下制备小模数齿轮;以微观形貌最佳的注射坯为前提条件,研究烧结温度对小模数齿轮精度的影响。【方法】采用MLA650F场发射扫描电子显微镜观察齿轮注射坯的微观形貌,分别采用JE 20齿轮测量中心、Image J软件、洛氏硬度计测量了烧结后齿轮的精度、孔隙率、硬度。【结果】结果表明,在110 MPa注射压力下,当烧结温度从1330℃升高至1350℃时,齿轮表面的孔隙率降低48.28%,密度提升5%,硬度提升8.22%,收缩率持续增大,精度逐渐提高;当温度超过1350℃后,孔隙率降低20%,密度降低0.26%,硬度降低0.51%,收缩率缓慢提高,齿轮精度逐渐下降;烧结温度为1350℃时,齿轮的综合性能最佳,孔隙率为1.5%,密度为7.56 g/cm3,硬度为39.5 HRC,收缩率为14.1%,精度等级最高,达到了标准GB/T 2363-1990的7级精度。
[Objective]In order to improve the accuracy of small-module gears,small-module gears are prepared by using 420 stainless steel powder as raw material and metal powder injection molding(MIM)process at a sintering temperature of 1330-1360℃.The injection blank with the best micro-morphology was taken as a prerequisite to study the effect of sintering temperature on the accuracy of small-module gears.[Methods]MLA650F field emission scanning electron microscope was used to observe the microscopic morphology of the gear injection blanks;JE 20 gear measuring center,Image J software,and Rockwell hardness tester were used to measure the accuracy,porosity,and hardness of the sintered gears,respectively.[Results]The results show that under 110 MPa injection pressure,when the sintering temperature is increased from 1330℃to 1350℃,the porosity of the gear surface decreases by 48.28%,the density increases by 5%,the hardness increases by 8.22%,the shrinkage continues to increase,and the accuracy is gradually improved;when the temperature is more than 1350℃,the porosity decreases by 20%,the density decreases by 0.26%,the hardness decreases by 0.51%,the shrinkage rate increases slowly,and the accuracy of the gear gradually decreases;when the sintering temperature is 1350℃,the gear has the best comprehensive performance,with a porosity of 1.5%,a density of 7.56 g/cm3,a hardness of 39.5 HRC,a shrinkage rate of 14.1%,and the highest accuracy level of grade 7 in the GB/T 2363—1990 testing standard.
作者
刘祚时
明澳阳
任继华
王笑一
钟志丞
朱敏峰
朱卫东
LIU Zuoshi;MING Aoyang;REN Jihua;WANG Xiaoyi;ZHONG Zhicheng;ZHU Minfeng;ZHU Weidong(School of Mechanical and Electrical Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China;School of Intelligent Manufacturing and Materials Engineering,Gannan University of Science and Technology,Ganzhou 341000,China;School of Mechatronics Engineering,Henan University of Science and Technology,Luoyang 471003,China;Jiangxi Yuean Advanced Materials Co.,Ltd.,Ganzhou 341500,China;Jiangsu Gian Technology Co.,Ltd.,Changzhou 213023,China)
出处
《机械传动》
2025年第9期136-142,共7页
Journal of Mechanical Transmission
基金
国家自然科学基金项目(52375047)。
关键词
金属粉末注射成形
尺寸精度
烧结温度
收缩率
孔隙率
密度
硬度
Metal powder injection molding
Dimensional accuracy
Sintering temperature
Shrinkage rate
Porosity
Density
Hardness
作者简介
刘祚时,男,1976年生,江西吉安人,硕士,教授,主要研究方向为智能机器人技术,liuzuoshi@163.com;通信作者:任继华,男,1976年生,江西于都人,博士,高级工程师,主要研究方向为齿轮,proffrence@163.com。
