Sintokogio, Ltd.

Toshiya Tsuji

Yuji Kobayashi

A processing method according to one aspect incudes preparing a metal workpiece having a hole that opens to a surface thereof, filling the hole with processing media, and applying an external force to the processing media to apply a compressive residual stress to an inner surface of the hole.

Processing method and processing apparatus for workpiece

A surface treatment method includes: preparing a metal laminated article; and blasting a surface of the metal laminated article using shot media, the shot media include first shot media of first granularity with a grit shape and second shot media of second granularity with a grit shape, and the first granularity is greater than the second granularity.

Surface treatment method

The cost for shot-peening is intended to be reduced. The method for shot-peening of the present invention comprises a first step for processing a work by shot-peening by projecting shots onto the work, and a second step for processing the work by shot-peening by projecting the shots onto the work at a speed for projecting the shots that is slower than the speed in the first step, wherein the second step uses the same shot-peening machine and same shots that have been used in the first step. By this method, an intended distribution of compressive residual stresses is obtained by the processes in the first and second steps and the surface roughness of the work is decreased by the process in the second step wherein the shots are projected at the speed that is slower than that in the first step. Further, no removal or supply of the shots and no re-setting of the conditions for the process that are related to the removal and supply of the shots are required. Multiple shot-peening machines do not need to be installed. Thus the cost for shot-peening is reduced.

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Toyokawa, Japan

Toshiya Tsuji