公开(公告)号：US3827333A

公开(公告)日：1974-08-06

申请号：US37510873

申请日：1973-06-29

Applicant: INGERSOLL MILLING MACHINE CO

Inventor： HURD J

IPC: B23Q11/00 ,  G05B19/404 ,  B23C1/02 ,  B23B39/08 ,  B23C9/00

CPC classification number: B23Q11/0028 ,  G05B19/404 ,  G05B2219/37357 ,  G05B2219/45129 ,  G05B2219/45145 ,  G05B2219/49169 ,  Y02P90/265 ,  Y10T408/08 ,  Y10T408/175 ,  Y10T409/306888

Abstract: In a machine tool having a headstock vertically movable along a Y axis and a spindle horizontally extensible from the headstock along a Z axis, the sag or droop of the extremity of the spindle as a cantilever member will change as the spindle position along the Z axis is changed. A compensating system is here disclosed which senses the Z axis position of the spindle to create a signal varying as a predetermined function of that position to represent the amount of sag for a given weight load on the spindle. That signal is injected into the servo positioning loop for the Y axis to make the positioned height of the headstock correspondingly greater than that designated by a Y axis command, such that the cutter on the spindle extremity ends up at the commanded and desired Y axis position. This substantially eliminates workpiece errors otherwise arising because of spindle drooping under gravity, especially when the sensed spindle is extended by a relatively great amount from its supporting headstock. The sensing and signal producing device is physically adjustable to enable matching of the predetermined function to observed amounts of sag for different weight loads. A plurality of such devices may be pre-adjusted for different weight loads and then selectively switched into the system when each load is actually placed on the spindle.

Abstract translation: 在具有可沿着Y轴可垂直移动的主轴箱和从主轴架沿着Z轴水平延伸的主轴的机床中，作为悬臂构件的主轴的末端的垂度或下垂将随着沿着Z轴的主轴位置而改变 改变了 这里公开了一种补偿系统，其感测主轴的Z轴位置以产生作为该位置的预定功能而变化的信号，以表示对于主轴上的给定重量负载的下垂量。 该信号被注入到用于Y轴的伺服定位回路中，以使主轴箱的定位高度相应地大于由Y轴指令指定的高度，使得主轴端部上的切割器在指令和期望的Y轴位置处结束 。 这实质上消除了由于在重力下主轴下垂而引起的工件误差，特别是当感测到的主轴从其支撑头架延伸相对较大的量时。 感测和信号产生装置在物理上是可调节的，以使得能够将预定功能与不同重量负载的下垂的观察量匹配。 可以针对不同的重量负载预先调整多个这样的装置，然后当每个负载实际上放置在主轴上时选择性地切换到系统中。