延性金属板のせん断加工機構(第1報)

アルミニウムにおける材質および工具面摩擦の影響

抄録

The aim of this research is to apprehend comprehensively the phenomena encountered in the shearing process which hitherto have been treated individually by many researchers. In addition, this research intends to contribute to give reasonable basis for the selection of the optimum working conditions.
Working conditions which may effect on the mode of deformation of the sheared specimen are the mechanical properties of the specimen and such restraining conditions as friction of the tool surfaces, supporting condition of the specimen and tool clearance provided that the shape of the tool and the specimen are unaltered.
The first report deals with the effect of the mechanical properties of material and lubricants on the quality of the sheared surface and shows that the process of forming the smooth portion in the sheared surface and subsequent initiation of the fracture crack is essentially influenced by the hydrostatic pressure prevalent in the material near the cutting edge.
The effect of the mechanical properties of material on the quality of the sheared surface is uniquely specified by taking work-hardening index n as a parameter.
A qualitative interpretation on the effect of each working condition on the shearing resistance is given in a consistent manner.