New Machinability Enhancers for Improved Drilling of PM Steels
Machining operations are often necessary as a post-processing step for PM components to achieve a particular geometry,surface finish and/or close tolerance prescribed by its design.As to PM components,the presence of porosity,combined with effect of heterogeneous microstructure,often result in reduced lifetime of the deployed cutting tools,increasing the processing cost.To improve the machinability,additives like manganese sulfides(MnS)are commonly admixed to the powder.However,MnS present adverse effects such as mechanical properties deterioration,rusting formation,corrosion susceptibility and furnace damage.Therefore,it is of great interest to develop new additives to compliment MnS in PM steels.In this study,new machining additives including three oxides MO1,MO2 and MO3 as well as one halide MH have been incorporated to the powder by admixing in different ratios up to 0.3 wt.%,but smaller than the amount of MnS added(0.5 mass%).Machinability is assessed by drilling tests in both dry and wet conditions(with coolant).The responses evaluated include drilling thrust force,tool wear,chips morphology,drilled hole diameter,surface finish and burr size in the case of open hole.
Machinability Machining enhancers Sintered steels Drilling
Yang Jing Calero Jose Antonio
AMES-Sintered Metallic Components,08620,Barcelona,Spain
国际会议
北京
英文
481-488
2018-09-16（万方平台首次上网日期，不代表论文的发表时间）