基于柔性送料的高频旋锻数值模拟

Numerical simulation on high frequency rotary forging based on flexible feeding

在高频旋锻过程中,由于送料机构的持续进给,在锻模闭合时其喇叭口会阻挡工件的送入,导致出现材料逆送料方向流动并呈现逆流量大于顺流量的现象,这种现象使得进给力和锻打力增加,从而导致锻模寿命降低和成形质量下降。针对该问题,以烧结态铜管旋锻过程为研究对象,提出了基于柔性送料方式的高频旋锻方法,并采用有限元方法研究了送料方式及柔性送料弹性系数对旋锻成形工艺的影响。结果表明:柔性送料方式不但能够解决材料逆流带来的问题,提高管件的成形质量和成形效率,还能够降低进给力与成形力,提高锻模寿命;对于柔性送料的高频旋锻成形,在一定范围内,随着弹簧弹性系数的增加,管件纵向厚度分布变化不大,周向厚度分布趋于均匀。

In the process of high-frequency rotary forging,due to the continuous feeding of feeding mechanism,the bell mouth of forging die will block the feeding of workpiece when the forging die is closed,resulting in the phenomenon that the material flows against the feeding direction and the counter flow is greater than the forward flow,which makes the feeding force and forging force increase and leads to the reduction of forging die life and forming quality.Therefore,for the rotary forging process of sintered copper tube,a high-frequency rotary forging method based on the flexible feeding mode was proposed,and the influences of feeding method and elastic coefficient of flexible feeding on the rotary forging process were studied by the finite element method.The results show that the flexible feeding mode can not only solve the problems caused by the counter flow of materials,and improve the forming quality and forming efficiency of pipe fittings,but also reduce the feeding force and forming force,and improve the life of forging die.Thus,within a certain range,for the high-frequency rotary forging of flexible feeding,with the increasing of spring elastic coefficient,the longitudinal thickness distribution of pipe fittings does not change much,and the circumferential thickness distribution tends to be uniform.