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一、问题的提出图1所示是精车长圆柱形薄壁工件外圆时,常用的液性塑料定心夹具,关于液性塑料夹具的工作原理是众所周知的,然而,有两个直接涉及到加工精度的问题通常很易被机制工艺人员所忽视。 1.夹紧变形对图1所示状态工件外圆加工尺寸的影响设液性塑料无压力时夹具套筒外壁与工件孔壁之间存在径向间隙△_0,如图2所示。当液性塑料达到工作压力P时,若夹具套筒不受工件孔壁约束自由扩张,其直径将产生扩张量△_m。实际上,由于工件孔壁之限
First, the problem raised Figure 1 is fine cylinder long cylindrical thin-walled workpiece cylindrical, commonly used liquid plastic centering fixture, the working principle of the liquid plastic fixture is well known, however, there are two directly involved To the accuracy of the problem is usually very easy to be ignored by the mechanism of the craft staff. 1. Clamping deformation of the state shown in Figure 1, the outer cylindrical workpiece processing size Set the liquid plastic pressure-free clamp sleeve outer wall and the workpiece hole between the radial gap △ _0 exist, as shown in Figure 2. When the liquid plastic reaches the working pressure P, if the fixture sleeve is free to expand freely by the hole wall of the workpiece, its diameter will produce the expansion △ _m. In fact, due to the limit of the hole wall of the workpiece