Generation Mechanism of Work Hardened Surface Layer in Metal Cutting

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  • HIKIJI Rikio
    Department of Mechanical Engineering, Kagoshima National College of Technology
  • KONDO Eiji
    Faculty of Engineering, Kagoshima University
  • KAWAGOISHI Norio
    Faculty of Engineering, Kagoshima University
  • ARAI Minoru
    Faculty of Education and Human Sciences, Yokohama National University

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  • Generation Mechanism of Work Hardened Surface Layer in Metal Cutting (Study of Mechanical Factors Acting on Depth of Work Hardened Surface Layer Using Calculation Model)
  • (Study of Mechanical Factors Acting on Depth of Work Hardened Surface Layer Using Calculation Model)

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Description

Finish machining used to be carried out in grinding, but it is being replaced by cutting with very small undeformed chip thickness. In ultra precision process, the effects of the cutting conditions and the complicated factors on the machined surface integrity are the serious problems. In this research, work hardened surface layer was dealt with as an evaluation of the machined surface integrity and the effect of the mechanical factors on work hardening was investigated experimentally in orthogonal cutting. As a result, it was found that work hardened surface layer was affected not only by the shear angle varied under the cutting conditions and the thrust force of cutting resistance, but also by the thrust force acting point, the coefficient of the thrust force and the compressive stress equivalent to the bulk hardness. Furthermore, these mechanical factors acting on the depth of the work hardened surface layer were investigated with the calculation model.

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