CAJ | 학술논문

带有台阶的大型轴类锻件在改锻过程中，难度最大的是对台阶区域的拔长，尤其是当台阶直径落差较大时，往往会在台阶根部小圆造成径缩形成的折叠缺陷。而通过改变布砧方式可以改变台阶与坯料轴线的垂直状态，减小拔长过程中台阶端部金属的轴向伸长，消除折叠缺陷。通过数值模拟的方法对不同布砧方式的拔长过程进行分析，可以找到最佳布砧方式。
대유태계적대형축류단건재개단과정중，난도최대적시대태계구역적발장，우기시당태계직경락차교대시，왕왕회재태계근부소원조성경축형성적절첩결함。이통과개변포침방식가이개변태계여배료축선적수직상태，감소발장과정중태계단부금속적축향신장，소제절첩결함。통과수치모의적방법대불동포침방식적발장과정진행분석，가이조도최가포침방식。
In the forging operation for re-using stepped shaft forgings, the most difficulty is to draw the step area , especially when the diameter changes greatly. In this case, the diameter reduction caused by the small circle on the step root can produce a folding defect. The folding defect can be eliminated by changing the way to arrange hammering blocks to alter the perpendicularity of the step to the forging in order to reduce the axial extension of the metal on the step end during drawing operation. The drawing operations with different hammering block arrangements are analysed by the means of numerical simulation to find out the best hammering block arrangement.