Influence of Constraint on Material on Shearing Characteristics : 2nd Report, Influence of Pre-Punching(Machine Elements, Design and Manufacturing)

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  • せん断加工特性に及ぼす材料拘束の影響 : 第2報,予加工の影響(機械要素,潤滑,設計,生産加工,生産システムなど)
  • せん断加工特性に及ぼす材料拘束の影響(第2報)予加工の影響
  • センダン カコウ トクセイ ニ オヨボス ザイリョウ コウソク ノ エイキョウ ダイ2ホウ ヨ カコウ ノ エイキョウ

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Abstract

In shearing, the crack occurrence may be controlled by elevating a hydrostatic pressure of a material near tool cutting edges. In the progressive die forming, shearing phenomena is affected by pre-punching station. Then the influence of pre-punching on shearing characteristics was investigated by the experiments and FEM analysis. The results of this study clarified the followings. With increasing of diameter of pre-punched hole, die side crack earlier occurs and punch side crack later occurs. This tendency agrees with the magnitude of hydrostatic pressure at punch and die cutting edges. Change of hydrostatic pressure mainly depends on decreased rigidity of pre-punched hole material to be sheared. It was also ascertained that the counter punch mainly affects the punch side crack occurrence.

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