硬質被膜処理を施した温・熱間鍛造工具の塑性変形抵抗に及ぼす熱負荷の影響

概要

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The effect of thermal loads including frictional heat due to sliding velocity and the friction shear factor on the deformation resistance of forging tools with a hard coating film was investigated using the finite element method. Temperature distribution in the tool was calculated by thermal analyses, taking into consideration frictional heat generated by frictional sliding. Plastic deformation of the tool was evaluated according to the distribution of flow stresses obtained from the temperature distribution. This evaluation was carried out with the friction shear factor, m, varied from 0 to 0.9 and the tool velocity, Vt, from 500mm/s to 1000 mm/s. In the case of m=0.20, the maximum temperature with Vt =1000mm/s was 32℃ higher than that with Vt = 500mm/s at the contact time of 0.08s. The maximum equivalent strain with Vt =1000mm/s was approximately 18% higher than that with Vt = 500mm/s. In the case of Vt = 1000mm/s, the maximum equivalent strain with m=0 was approximately 29% higher than that with m=0.40 (m_h = m/4 =0.10) at the contact time of 0.08s. The increase of the friction shear factor and the sliding velocity caused the plastic deformation of the forging tool.
2004-01-30