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D_(12)A液压仿形机床(大连机床厂制造)仿形原理如图1所示。仿形阀与刀架刚性固定在一起,而阀柱可以相对于阀体做微量移动,刀架又与活塞杆连接在一起。油泵来的压力油P进入油缸的前腔和后腔,而后腔又用凸轮作用,改变仿形阀的可变间隙δ(与油池相通),因此后腔压力P_2小于前腔压力P_1;但由于前腔工作面积小于后腔工作面积,即:F_前<_F后,因此刀架处于平衡位置时,P_1·F_前=P_2·F_后。当加工工件时,由于增加径向阻力P_3,这时就有新的平衡状态,P_3+P_1·F_前=P_2·F_后。很明显,以上两种状态下的P_1P_2其各自的值是不同的。
D_ (12) A profiling machine (Dalian Machine Tool Works manufacturing) profiling principle shown in Figure 1. The profile valve and the tool holder are rigidly fixed together, while the spool can make a small amount of movement relative to the valve body, which is in turn connected to the piston rod. The pressure oil P from the oil pump enters into the front cavity and the back cavity of the cylinder, and then the cam also acts as a cam to change the variable gap δ (which is communicated with the oil pool) of the profiling valve. Therefore, the back cavity pressure P_2 is smaller than the front cavity pressure P_1; Because the work area of the front cavity is smaller than the work area of the back cavity, namely: after F_ front <_F, therefore, when the tool rest is in the equilibrium position, P_1 · F_front = P_2 · F_after. When the workpiece is machined, there is a new equilibrium due to the increased radial resistance P_3, P_3 + P_1 · F_front = P_2 · F_after. Obviously, the above two states of P_1P_2 their respective values are different.