对于内孔较大的圆环类锻件,为减少内孔加工余量,均需进行马架扩孔。我厂产品中有几种薄壁套筒均在1吨自由锻锤上用马架扩孔的工序来锻制。过去,马架是整体焊接而成。使用时需人来回往砧块上套或卸,既繁重又烦锁,工人劳动强度很大。目前,采用一种简易活动马架(图1),大大减轻了工人劳动强度。现对简易活动马架结构介绍如下。 For the larger bore ring forgings, in order to reduce the machining allowance for the hole, are required for reaming rack. I plant products in several thin-walled sleeves in the 1-ton free forging hammer bar rack reaming process to forging. In the past, the racks were welded together. Need to use when going back and forth to the anvil sleeve or unloading, both cumbersome and annoying, workers labor intensity. At present, the use of a simple activity rack (Figure 1), greatly reducing the labor intensity of workers. Now simple rack structure described below.