一、引言鞍钢自1961年试制成功冷轧汽车薄板以来,冷轧汽车板的质量逐年有所提高,特别是1964、1965两年之中质量有了较大幅度的提高。在这以前,汽车板在长春汽车厂冲制时废品率高达10%(指六大难冲零件综合冲废率)。到1964年降至5%,而到1965年则已降至2.5%,而且在六大难冲零件中除前围、门里板两零件 I. INTRODUCTION Since the successful trial of Ansteel cold rolled sheet since 1961, the quality of cold rolled sheet has been increased year by year, especially in the two years between 1964 and 1965, the quality has been greatly improved. Prior to this, the car plate in Changchun Automobile Factory punched when the rejection rate as high as 10% (refers to the six major hard-to-punch parts punching rate). To 5% in 1964, but dropped to 2.5% in 1965. In addition to the front six parts, the two parts