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在高精度箱体主轴孔的镗削中,镗模的导向支承采用液体动压轴承。它具有间隙小、回转精度高、耐磨性好等优点,能显著改善箱体主轴孔的加工质量,特别适宜于高精度箱体主轴孔的镗削。镗模结构图1是CG6125车床箱体主轴孔的加工图。镗模安装在专用镗床工作台上,工件以已加工的M、N面定位,安装在镗模的基准板上(如图2所示),使工件上待加工孔与镗模板上的孔同轴。镗杆则安装在镗模板上的前后镗套内,这样可大大提高机床-夹具-刀具-工件间的刚性。镗杆与机床主轴采用精密活动接头联接(如图3所示),以减小机床误差对工件精度的影响。整套镗模的结构较简单,由定位基准板、调整块、镗模板及镗杆组成。定位基准板的M、N面,必须根据床身安装主轴箱的技术要求来制造,并要有一定的精度储备量,这样加工的工件就具有较好的互换性。
In the boring of the spindle hole of the high precision box, the guide bearing of the boring mold adopts the hydrodynamic bearing. It has a small gap, high precision rotation, good wear resistance, etc., can significantly improve the processing quality of the spindle hole in the box, especially suitable for high-precision box spindle bore boring. Boring structure Figure 1 is a CG6125 lathe box spindle hole machining. Boring mold installed in a special boring machine table, the workpiece has been processed M, N surface positioning, mounted on the base plate of the boring mold (Figure 2), so that the hole to be processed on the workpiece with the hole on the boring template with axis. Boring bar is installed in the front and rear boring bored on the template, this can greatly enhance the machine - fixture - tool - the rigidity between the workpiece. The boring bar and the spindle of the machine tool are connected by a precision movable joint (as shown in FIG. 3), so as to reduce the influence of the machine error on the workpiece precision. The whole set of boring mold structure is relatively simple, by the positioning reference plate, adjusting block, boring template and boring bar composition. Positioning of the M, N plane, must be based on the bed to install the technical requirements of the spindle box to create and have a certain amount of precision reserves, so that the workpiece is processed with better interchangeability.