Development of Methods of ToolSurface Treatment for Preventing Brittle Fracture of Composite Tool Materials

Research Project

Project/Area Number	59850022
Research Category	Grant-in-Aid for Developmental Scientific Research
Allocation Type	Single-year Grants
Research Field	機械工作
Research Institution	Tokyo University of Agriculture and Technology
Principal Investigator	TAKEYAMA Hidehiko 東京農工大学, 工, 教授 (80111631)
Project Period (FY)	1984 – 1985
Project Status	Completed (Fiscal Year 1985)
Budget Amount *help	¥6,800,000 (Direct Cost: ¥6,800,000) Fiscal Year 1985: ¥1,000,000 (Direct Cost: ¥1,000,000) Fiscal Year 1984: ¥5,800,000 (Direct Cost: ¥5,800,000)
Keywords	Adhesion / adhesive fracture / surface treatment / adhesion testing machine / anti-adhesive substance / Nイオン注入
Research Abstract	1. Fundamental study on adhesion on tool face and adhesive fracture of tool (1) Mechanism of initial adhesion: The initial anchor of adhesion on sintered carbide tool has been proved to be built up at the binder (Co) phase through EPMA. (2) Assessment of various finishes of tool surface: When finishing carbide tool with a grinding wheel of alumina grain, metal adhesion and adhesive fracture are suppressed by the aid of anti-adhesive substances contained in the grinding wheel which are embedded at the binder phase. 2. Prototyping of vacuum, high-temperature testing machine and its evaluation An adhesion testing machine, in which two materials adhere each other at <10゛(-5)> torr vacuum and up to 1000゜C and the adhesive force or strength can be quantitatively measured, has been prototyped. The adhesive tendency tested by the testing machine well correlates with the results obtained by actual cutting test, this indicating successful prototyping. 3. Development of tool-surface treatment during tool manufacture Based upon the knowledges obtained above, TiN coated tips, N ion-injected tips, TiN coated plus N ion-injected tips, etc. were prototyped by the cooperative researcher(Toshiba Tungaloy Co. Ltd.). Subjecting those tips to the testings with the prototyped testing machine, intermittent cutting and roughness measurements of machined surfaces, TiN coated tips and TiN coated plus N ion-injected tips have been proved excellent. Especially, the latter is considered highly effective in view of practical tool manufacture and utilization because of freedom of coat flaking.