Drilling of Hardened Sintered Steel (2nd report)

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  • 焼入れ焼結鋼の穴加工 (第2報)
  • ヤキイレ ショウケツ コウ ノ アナカコウ ダイ2ホウ ヒサクザイ カタサ ガ アナカコウセイ オヨビ ドリル セッソン ニ オヨボス エイキョウ
  • —Effect of Work Hardness on Drilling Property and Drill Fracture—
  • ―被削材硬さが穴加工性及びドリル折損に及ぼす影響―

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Abstract

This report aims to find the influence of work materials on drill breakage when machining hardened sintered steels, and to clarify the mechanisms of the drill breakage. The work materials having different hardness obtained by the different heat treatment were prepared, and drilling, and turning tests were carried out. The main results obtained are as follows : Fracture of the drill occurs when drilling materials of high hardness. During drilling the high hardness sintered steels, cutting temperature becomes high, and so that thermal expansion caused a high friction between the drill and surface of the hole drilled. In the effect the drill breaks down, when the friction force exceeds the drill's twisting strength. However, in drilling the low hardness sintered steels, the cutting temperature becomes low, and the thermal expansion is also small, furthermore yield strength of their steels is small, so that the friction force does not become large, and consequently the drill does not break down.

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