我厂550mm轧机及400mm×3轧机，因压下量大，轧件经常在箱形孔内打滑咬入困难，有时头部温降过大，产生断辊事故。为了改善咬人条件，开始采用孔槽底部焊痕的办法增大咬人角，结果造成合金钢轧材质量下降。后改用手工剔槽，效果也不佳。最近利用我厂报废的50车床，在刀架上加一 I plant 550mm mill and 400mm × 3 mill, due to the large amount of rolling, rolling often bite box hole bite difficult, and sometimes head temperature drop is too large, resulting in broken roller accident. In order to improve the bite conditions, began to use the bottom of the hole weld way to increase the bite angle, the result of the quality of the alloy steel rolled. After switching to manual tick slot, the effect is not good. I recently scrapped the use of 50 lathes, plus one on the knife holder