1　问题的提出　　我厂装载机后车架镗加工是在卧式镗床T612上完成的，在加工过程中存在如下问题：① 需要刮削的四个端面间距尺寸（609）过大（图1），刀杆伸出量过长；② 刮削端面尺寸（Φ 145）较大，由于刀头切削部分伸出较长且受刀杆刚度影响，刮削端面时切削力较大，产生 1 Problem I plant boring machine rear frame boring machine is completed in the horizontal boring machine T612 in the processing of the following problems: ① Need to shave the four end spacing (609) is too large (Figure 1) (2) the scraping end face size (Φ 145) is larger, as the cutting part of the cutter head protrudes longer and is affected by the rigidity of the cutter bar, the cutting force is larger when the scraping end face is generated