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我处一台ＷＹ６０Ａ挖掘机因使用频繁，又缺少应有的保养，造成动臂下销孔严重偏磨。经测量，轴套销孔最大偏磨量达到 １．７ ｍｍ（如图 １）。 通常的修复方案是委托外加工，利用镗床镗孔、镶套。鉴于动臂工件又长又重，动臂上、下销孔轴线平行度和动臂下销孔的轴线对动臂纵?
Because of the frequent use of the WY60A excavator and lack of proper maintenance, the bottom pin hole of the boom was seriously worn out. After measurement, the maximum eccentric wear of the shaft pin hole reached 1.7 mm (Figure 1). The usual repair program is to commission external processing and use boring machines for boring and inserting. In view of the fact that the boom workpiece is long and heavy, the axis parallelism of the upper and lower pin holes of the boom and the axis of the lower pin hole of the boom correspond to the longitudinal axis of the boom.