Starting with rigid tools, designed for blanks with aconstant sheet thickness, the blankholder geometry hasbeen modified to the initial sheet thickness distributionof the TRB.

• 以对于厚度不变的钢板胚料而设计的刚性工具起始，按TRB开头的钢板厚度分布，修改了胚料支撑的几何形状。