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1.绪言过去,已进行了许多有关提高深冲用超低碳钢板 r 值的研究。其中,近年来从经济性的薄板生产工艺的观点出发,正在大力开展在铁素体区(a 区)热轧,提高钢板深冲性的研究。热轧时,由于轧辊与钢板之间的摩擦一般都较大(μ=0.2～0.4),所以,会产生钢板表面的剪切变形和板厚方向的变形不均匀性,因此,在钢板厚向
1. INTRODUCTION In the past, many studies have been conducted to improve the r-value of ultra-low carbon steel for deep drawing. Among them, in recent years, from the viewpoint of economical sheet production process, hot rolling in the ferrite zone (a zone) is being vigorously carried out to improve the deep drawability of the steel sheet. In the hot rolling, since the friction between the roll and the steel plate is generally large (μ = 0.2 to 0.4), shear deformation of the steel sheet surface and non-uniform deformation in the thickness direction occur. Therefore, in the steel plate thickness direction