Selective Densification of Powder Metal Components-A Review and Scope for New Product Development
The process of Selective Densification(SD)of Powder Metal(PM)transmission and engine components has been successful in displacing conventional highly loaded wrought and cast machined parts.This is now an established resource and energy efficient manufacturing technology.Roll densified sprockets continue to be produced in high volumes for the automotive market.They are well proven in the field,with tens of millions of parts shipped over the past 15 years,with an exceptional service record.Other energy and cost effective processes such as sinter brazing and local infiltration of PM carriers are also well established,offering improved properties compared to traditional methods.This review will cover historical aspects of advanced densification processes,some of the materials and properties developed,and will discuss trends for the future.The timing is now right for PM to offer better solutions in both the traditional transmission gear market as well as for new Electric Drivetrains.Coupled with high core densities and appropriate heat treatments,Selectively Densified PM gears with~10%lighter weight can displace highly loaded wrought machined transmission gears in certain applications.The potential noise dampening characteristics(NVH)of PM gears offer added refinement for gear designers.This is especially of interest for low noise Electric Vehicles(EVs).Another opportunity to improve the load bearing performance of PM is by forming a fully dense integral bearing layer on a PM surface,for example on transmission clutch and piston plate thrust faces.These thrust faces are highly loaded against needle roller bearings and must survive high contact stresses,without pitting or spalling.This application further increases the scope of PM in new markets,offering customers improved cost performance metrics and lower energy consumption.
Selective Densification High Density High Temperature Sintering Vacuum Carburizing Product Development Lean Alloy Transmission Gears Electric Vehicles NVH
Shivanath Rohith
Stackpole International 2430 Royal Windsor Drive Mississauga,ON L5J 1K7,Canada
国际会议
北京
英文
1983-1992
2018-09-16（万方平台首次上网日期，不代表论文的发表时间）