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1.江西理工大学 机电工程学院,赣州 341000
2.赣南科技学院 智能制造与材料工程学院,赣州 341000
3.河南科技大学 机电工程学院,洛阳 471003
4.江西悦安新材料股份有限公司,赣州 341500
5.江苏精研科技股份有限公司,常州 213023
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。
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。
网络出版日期:2024-09-30,
收稿日期:2024-06-03,
移动端阅览
刘祚时, 明澳阳, 任继华, 等. 烧结温度对MIM小模数齿轮精度的影响[J/OL]. 机械传动, 2024,1-7.
LIU Zuoshi,MING Aoyang,REN Jihua,et al.Effect of sintering temperature on the accuracy of MIM small-module gears[J].Journal of Mechanical Transmission,XXXX,XX(XX):1-7.
目的
2
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1 330~1 360 ℃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
2
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,采用JE 20齿轮测量中心、Image J软件、洛氏硬度计分别测量了烧结后齿轮的精度、孔隙率、硬度。
结果
2
结果表明,在110 MPa注射压力下,烧结温度在1 330~1 350 ℃,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1 350 ℃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1 350 ℃时,齿轮的综合性能最佳,孔隙率为1.5%,密度为7.56 g/cm
3
,硬度为39.5 HRC,收缩率为14.1%,精度等级最高,达到了GB/T 2363—1990标准的7级精度。
Objective
2
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 1 330-1 360 ℃. 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
2
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
2
The results show that under 110 MPa injection pressure
in the sintering temperature range of 1 330-1 350 ℃
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 1 350 ℃
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 1 350 ℃
the gear has the best comprehensive performance
with a porosity of 1.5%
a density of 7.56 g/cm
3
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 standards.
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 moldingDimensional accuracySintering temperatureShrinkage ratePorosityDensityHardness
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