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Non-destructive Detection of a Sintered Tool Material by Impact Repetition

Research Project

Project/Area Number 60550084
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 機械工作
Research InstitutionTokyo Institute of Technology, Dept. of Mech. Engg. Science

Principal Investigator

SHIRAKASHI Takahiro  Prof. of Tokyo Institute of Technology, 工学部, 教授 (50016440)

Co-Investigator(Kenkyū-buntansha) IHARA Tohru  Research Associate of Tokyo Institute of Technology, 工学部, 助手 (80134831)
OBIKAWA Toshiyuki  Research Associate of Tokyo Institute of Technology, 工学部, 助手 (70134830)
USUI Eiji  Prof. of Tokyo Institute of Technology, 工学部, 教授 (20016299)
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: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1985: ¥1,500,000 (Direct Cost: ¥1,500,000)
KeywordsSintered tool material / Tool failure / Impact deterioration / Ultra-sound wave / 非破壊試験
Research Abstract

In order to predict tool failure, the fracture characteristics of tool material and their behaviors with impact repetition are required. In recent years, many kinds of sintered tool materials come on the stage because of their excellent characteristics, such as high hardness under high temperature and low frictinal coefficient. The fracture characteristics and their change with impact repetition are required for the prediction of tool failure, but an extreme lot of specimen should be prepared bacause of the scatter of their fracture stresses. The object of the project is a development of non-destructive detection method of fracture stress and its change ---deterioration--- with impact repetition. The results from the project are as follows:
1. In order to study the deterioration mechanism of a sintered tool material, the impact testing machine is specially designed, by the machine the fracture and deterioration test may be possible under wide temperature and impact duration range. 2. The mechanism of deterioration is considered as the generation of small crack with random direction around hard particles. 3. A change of a characteristics of ultra-sound wave propagation with impact repetion in sintered tool material is next discussed. An attenuation of wave propagation, especially that of shear wave, is greatly affected by the deterioration level, while a change of velocity of the propagation is not seen in both of lateral and ghear waves. 4. A scatter of fracture stress, which is the defference of the structure in the material, may also be detected by the characteristics of the wave propagation.

Report

(1 results)
  • 1986 Final Research Report Summary
  • Research Products

    (5 results)

All Other

All Publications (5 results)

  • [Publications] 白樫高洋,井原透,臼井英治: 精密工学会誌.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] 白樫高洋,井原透,臼井英治: 精密工学会誌.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] T.Shirakashi,E.Usui: Proc,of 3rd International Metal Cutting Conference. (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Takahiro Shirakashi, Tohru Ihara, Eiji Usui: "Analytical Prediction of Chipping Occurrence of Carbide Tool in Interrupted Turning Operation with Temperature Rise ( Part 1 )" Journal of Precision Engineering.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Takahiro Shirakashi, Tohru Ihara, Eiji Usui: "Analytical Prediction of Chipping Occurrence of Carbide Tool in Interrupted Turning Operation with Temperature Rise (Part 2)" Journal of Precision Engineering.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary

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Published: 1987-03-31   Modified: 2016-04-21  

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