我厂在用图1所示结构的反挤压凹模进行反挤压成形生产轴承套圈的过程中,往往因下料重量散差较大以及坯料间温差较大,造成镦粗后的料饼直径(d’)较d散差较大,给反挤压成形工艺带来诸多困难,以致造成反挤压工件废品。为此我们对图1所示反挤压 I plant in Figure 1 shows the structure of the anti-extrusion die for reverse extrusion process of the production of bearing rings, often due to the greater the weight of the material weight and the greater the difference between the billet, resulting in upsetting material The diameter of cake (d ’) is larger than that of d, which brings many difficulties to the anti-extrusion forming process, resulting in the anti-extrusion workpiece scrap. To this end we reverse the extrusion shown in Figure 1