The Development of Free Machining Sintered Metal Including Non-metal Additives

Research Project

Project/Area Number	60550089
Research Category	Grant-in-Aid for General Scientific Research (C)
Allocation Type	Single-year Grants
Research Field	機械工作
Research Institution	Nagoya University
Principal Investigator	YAMAGUCHI Katsumi Nagoya University, School of Engineering, 工学部, 教授 (40023056)
Project Period (FY)	1985 – 1986
Project Status	Completed (Fiscal Year 1986)
Budget Amount *help	¥2,000,000 (Direct Cost: ¥2,000,000) Fiscal Year 1986: ¥1,000,000 (Direct Cost: ¥1,000,000) Fiscal Year 1985: ¥1,000,000 (Direct Cost: ¥1,000,000)
Keywords	Sintered Material / Machinability / Non-metal Additive / Cutting / 工具寿命
Research Abstract	Mixtures of stainless steel powders and non-metal additives are sintered and the sintered materials are cut. Then, the progress of tool wear during cutting is examined, and the most effective additives for prolonging tool life are found. Next, in order to clarify the reason why tool wear decreases with the addition of non-metal materials, the relief face after cutting is examined with an Electron Probe Microanalyzer. The conclusions obtained in the experiment are as follows: (1) The most effective additive is boron nitride. (2) By the addition of a 1% boron nitride to stainless steel, tool life has been incresed by an about factor of a hundred. (3) By the addition of a boron nitride and glass mixture to the stainless steel, tool life is prolonged still more. (4) Additive in the sintered metal acts as a lubricant on the relief face.