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CB型液压齿轮泵的壳体与齿轮外径配合的内孔严重磨损后,无论采取什么方法恢复内孔尺寸,都要进行精搪内孔φ55~(+0.03)毫米的工艺.在精搪时,怎样选择加工定位的工艺基准,是确保修复加工精度的重要环节. 按一般原则,修理时应尽量采用原制造厂的加工定位基准,但对于目前生产的CB型齿轮泵却无法这样做.这是由于制造厂在泵壳内孔加工后,即破坏了加工基准.例如: 1、天津机械厂加工泵壳内孔时,采用壳体端面长轴方向的二个定位销孔(图1)做为定位基准.加工完φ55~(+0.03)内孔后将定位销孔攻丝改成M10螺孔,用于安装泵盖
CB type hydraulic gear pump housing and the gear with the outer diameter of the bore after a serious wear and tear, no matter what method to restore the bore size, to be fine enamelled bore φ55 ~ (+0.03) mm process. , How to choose the process base for positioning is to ensure that an important part of the repair accuracy.According to the general principle, when repairing should try to use the original factory processing positioning benchmark, but for the current production of CB gear pump can not do so. For example: 1, Tianjin Machinery Factory processing pump housing bore, the use of shell end face of the long axis direction of the two positioning pin hole (Figure 1) to do For the positioning of the base. After processing φ55 ~ (+0.03) after the hole will be dowel pin tapping into M10 screw holes for the installation of pump cover