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铰接转向装载机后车架是整机的承载骨架，加工时主要考虑三组孔系：连接前后车架的铰接座孔（铰接孔），连接转向液压缸的后支座孔（转向孔），连接副车架支承架的支承架孔（连接孔）。孔系间的精度要求见图１，其中要求转向孔组对铰接孔组的平行度０．１ｍｍ，铰接孔组对连接?
The rear frame of the articulated steering loader is the bearing skeleton of the whole machine. Three main holes are to be considered when machining: a hinge hole (hinge hole) connecting the front and rear frames, a rear bearing hole (steering hole) connecting the steering hydraulic cylinder, Support frame hole (connection hole) to connect the subframe support frame. Hole between the accuracy requirements shown in Figure 1, which requires the steering hole group of the hinge hole group of parallelism 0.1mm, hinge hole group to connect?