论文部分内容阅读
将坯料1加热到600～800℃放入凹模2内,随着凸模3的下降,坯料向下挤压(如图a)。由于凸模3的一端做成阶梯形,在挤压成型时,一端阶梯与大头交界部分形成时没有压实,坯料3沿反方向流动,在上部产生空隙部分a、b。与此同时,前端的部分材料和凸模3的加压面5相碰。当凸模3继续下降,在压面5的作用下,使坯料上端的一部分材料返回充满a、b部分;另一部分材料流到凸模和凹模的问隙槽4内,形成脊缝毛边6。工件在半密闭模具内加工完毕
The blank 1 is heated to 600 ~ 800 ℃ into the die 2, with the punch 3 is lowered, the blank down squeeze (Figure a). Since one end of the punch 3 is formed in a step shape, there is no compaction at the time when one end of the step and the bulk head are formed at the time of extrusion, and the blank 3 flows in the opposite direction to create void portions a and b in the upper portion. At the same time, part of the material of the front end collides with the pressing surface 5 of the punch 3. When the punch 3 continues to descend, under the action of the pressing surface 5, a part of the material at the upper end of the blank is returned to fill a and b portions; another part of the material flows into the clearance groove 4 of the punch and the die to form a ridge stitch 6 . The workpiece is processed in a semi-airtight mold