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常规铣切时,主切削运动与进给运动往往一同进行,即刀具切削工件时,同时进行着进给运动。若刀具尖端半径为R,进给量为f, 则被加工表面粗糙度理论值为:H=f~2/8R。但当进给量稍有变化,表面粗糙度值也将发生变化,如变化量为△f时,则表面粗糙度理论值的变化量就为:△H=(f/4R)△f。因此,当因工件驱动系统的电机发生振动或工件进给而引起振动时,都会使实际被加工表面粗糙度比理论值增加许多。为了适应超精密加工的需要,国外研制了停动铣切工件的机床设备(图1)。从而保证了被加工表面的刀痕均匀一致,且因刀具切削时工件停动,所以不会发生振动,使被实际加工表面粗糙度十分接近理论值。
In conventional milling, the main cutting movement and feed movement are often carried out together, that is, the cutting tool when the workpiece, while the feed movement. If the tool tip radius R, the feed rate f, then the theory of the surface roughness is processed: H = f ~ 2 / 8R. However, when the feed rate slightly changes, the surface roughness value will also change, such as the amount of change △ f, then the theoretical value of the surface roughness changes as: △ H = (f / 4R) △ f. Therefore, when the vibration is caused by the motor of the workpiece driving system or the workpiece is fed, the surface roughness actually processed will increase a lot more than the theoretical value. In order to meet the needs of ultra-precision machining, developed a milling machine stop milling parts (Figure 1). So as to ensure that the surface to be machined knives uniform, and because the workpiece cutting tool cutting, so there will be no vibration, so that the actual processing of the surface roughness is very close to the theoretical value.