| 摘要 |
PURPOSE:To improve dent proofing property of a metallic plate and improve quality of coating face by work hardening one face of a metallic plate using a pair of press dies consisting of a die having a work projection on the face and a die having flat face of specified coarseness. CONSTITUTION:Indentation is formed only on the back of a metallic plate using a pair of press dies consisting of a die having a work projection on the face and a die having a flat face of surface coarseness of 1-10mu, and work hardening is caused. By this way, oil applied on the metallic plate for lubrication or rust proofing can escape from small gaps formed by surface coarseness. Thus, generation of high oil pressure due to confinement of the oil is prevented, and formation of concavities on the surface of the metallic plate can be checked. |
