摘要
粉末冶金零件烧结后往往面要切削加工 ,以达到压制时无法成形的设计特征或窄小的尺寸公差。可是 ,随着高性能材料出现 ,鉴于这些材料烧结后表观硬度与强度高 ,采用生坯切削加工可减低切削加工费用与增强竞争性 ,因此 ,是一种很有吸引力的生产工艺。现在 ,采用新润滑系统可使零件在烧结前进行切削加工 ,这些新润滑系统和常用润滑剂相比 ,都是一些能大大增高零件生坯强度的聚合物润滑剂。在切削加工时 ,较高的生坯强度可减低生坯开裂和 /或棱边剥落的危险这篇论文对由新聚合物润滑系统或常用EBS蜡润滑剂压制的烧结硬化材料FLC - 4 6 0 8的脱模特性与生坯特性进行了比较。这种比较是用实验室与生产规模压机压制成形的密度为 6 7~ 7 1g/cm3 的横向断裂试样和油泵齿轮进行的。还报告了油泵齿轮烧结后的性能和零件间性能的均一性。
P/M parts are often machined after sintering to meet tight dimensional tolerances or accommodate design features that cannot be formed during compaction. However, with the advent of high performance materials that exhibit high apparent hardness and strength after sintering, green machining becomes a very attractive process to reduce machining costs and promote competitiveness. Machining parts prior to sintering is now possible by using new lubricating systems containing polymeric lubricants that significantly enhance the strength of green parts as compared to conventional lubricants. The higher green strength reduces the risk of initiating green cracks and/or edge chipping during machining. This study compares green and ejection characteristics of FLC-4608 sinter hardening materials pressed with either a new polymeric lubricating system or a conventional EBS wax lubricant. This comparison was carried out on TR specimens and oil pump gears pressed from 6.7 to 7.1 g/cm 3 on laboratory and production scale presses. Sintered properties of the oil pump gears and part to part consistency are also reported.
出处
《粉末冶金技术》
CAS
CSCD
北大核心
2003年第5期270-277,共8页
Powder Metallurgy Technology