パルス状CO_2レーザビーム照射による脆性工具の耐熱衝撃性評価 : 超硬工具における熱き裂発生状況

概要

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As a basis for establishing a method to evaluate the thermal shock resistance of brittle tools, we irradiated CO_2 pulse laser beam on a cemented carbide tool to apply pure thermal shock and examined the states of thermal crack. The experiments were carried out on the condition of no melt on the beam irradiation surface. The crack appears at the beginning of the beam irradiation off time. Similarly in intermittent cutting, the crack is perpendicular to the cutting edge for the laser beam irradiation near the edge. The analyses of the temperature rise and thermal stress on the beam irradiation surface and in its neighborh∞ud have demonstrated that no tensile stress appears on the surface; in the region below the surface, the stress field is widely formed where the three principal stresses are tensile; the primary principal stress is always tensile and becomes maximum immediately after the beam irradiation.
一般社団法人日本機械学会の論文
1999-12-25