用低熔点合金固定冲头常因浇注方法不当,导致冲压过程中冲头活动而啃模,甚至冲头被拔出等现象。这不仅降低了冲模使用寿命,而且会使冲模因多次浇注在预热中不慎造成冲模退火。我们认为采用一般的浇注方法,所以存在上述问题主要有以下原因。 1.由于浇注间隙较小,合金的流动性差,在间隙内合金不 With low melting point alloy often fixed due to improper casting method, resulting in stamping punch activities and eating mode, and even the punch was pulled out and so on. This not only reduces the service life of the die, but also causes the die to inadvertently cause the die to anneal due to the multiple casting in the preheating. We believe that the general method of casting, so the existence of the above problems are mainly for the following reasons. 1. Due to the smaller pouring gap, poor fluidity of the alloy, the alloy in the gap is not