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要求在一次装夹中加工如图1所示的卧铣伸臂上A、B、C、D、E、F六面是十分困难的,从该图可以看出:四周都是斜面,在斜面上均没有孔,工件定位面Q为铸件毛坯面,在Q面上仅有两只φ100孔可以让夹紧螺栓通过。如果在Q面上采用三点定位,由于工件刚性和装夹稳定性等原因,极易产生夹压变形。为了提高装夹稳定性,通常是将三点定位变成四点(如图2)定位,其中一点改为可调螺钉,但是可调螺钉及夹紧变形都不好控制,象这样长的工件,加工完后因夹压变形而产生的扭曲变形至少都在0.2～0.3范围内。
It is very difficult to process the six sides of A, B, C, D, E and F on the horizontal milling arm as shown in Fig. 1 in one clamping. It can be seen from the figure that the four sides are all inclined surfaces, No holes on the workpiece positioning surface Q casting blank surface, in the Q surface, only two φ100 holes allow clamping bolts through. If the Q surface with three-point positioning, due to the rigidity of the workpiece and clamping stability and other reasons, easily produce crimping deformation. In order to improve the stability of the fixture, usually three-point positioning into four (Figure 2) positioning, one point to adjust the screw, but the adjustable screw and clamping deformation are not good control, such as long workpieces , After processing due to crimping deformation distortion generated at least in the range of 0.2 to 0.3.