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LF21防锈铝合金制品的粗大晶粒是生产中经常遇到的问题,粗大晶粒会使半制品深冲、弯曲、成型时表面粗糙或出现裂纹。因此目前国内公认LF21晶粒度大于2级不能作深拉深成型制品。我厂在洗衣机内桶整体拉深中有一批晶粒度大于4级的LF21板料,按正常材料工艺拉深几乎100％破裂。我们经过分析研究在Y28-450A双动液压拉延机上进行多次工艺试验,调整工艺参数,把压边力降低为正常拉深时的1/3,而拉深力比正常拉深增加2/3。同时加大拉深间隙,改
LF21 rust-proof aluminum alloy coarse grains are often encountered in the production of the problem, the coarse grains will make deep drawing semi-finished products, bending, forming rough surface or cracks. Therefore, currently recognized LF21 grain size greater than 2 can not be deep drawing deep-shaped products. I plant in the washing machine inner barrel deep drawing in a number of grain size greater than 4 LF21 sheet material, according to the normal material process drawing almost 100% rupture. After analysis and research, we carried out several process tests on the Y28-450A double-action hydraulic drawing machine to adjust the process parameters, reducing the blank holder force to 1/3 when drawing normally, and drawing the drawing force by 2 / 3. At the same time to deepen the gap, change