公开(公告)号：US4078195A

公开(公告)日：1978-03-07

申请号：US648640

申请日：1976-01-13

Applicant: Richard A. Mathias ,  Lyle C. Adams ,  Edward N. Miller

Inventor： Richard A. Mathias ,  Lyle C. Adams ,  Edward N. Miller

IPC: G05B19/416 ,  G05B13/00

CPC classification number: G05B19/4163

Abstract: Prior art adaptive control systems for numerically-controlled milling machines are first discussed in which N/C instructions and adaptive control system data are obtained and stored in a storage medium utilizing a software routine which takes into consideration parameters of the milling process and parameters of a specific milling machine. The instructions and data command, for sequential steps in the milling process, such items as spindle position, feedrate and reference milling forces and are supplied to an N/C unit and to the adaptive control system at the milling machine to automatically control the milling process. The adaptive control system includes a milling force sensor and functions to override the commanded feedrate on comparison of the actual milling forces during the process with the reference milling forces. An improvement is then discussed which modifies the adaptive control system data so that the data can be used on any milling machine having an N/C unit capable of responding to the N/C storage medium in which the N/C instructions and adaptive control system data are stored. A set of universal adaptive control variables are included in the adaptive control data. The adaptive control system at the milling machine is modified to respond to these universal adaptive control variables and further to internally store machine constants for the specific milling machine with which the adaptive control system is utilized. The improved adaptive control system then recomputes the adaptive control data including reference milling forces in accordance with the universal adaptive control variables and the machine constants and utilizes the recomputed adaptive control system data to override where necessary the commanded feedrate. In addition, provision is made in the improved adaptive control system for further modifying the adaptive control system data by operator-entered manual process control inputs. Applications of such improved adaptive control systems to numerically-controlled machine tools other than milling machines are also discussed.

公开(公告)号：US3974431A

公开(公告)日：1976-08-10

申请号：US511284

申请日：1974-10-02

Applicant: Lyle C. Adams

Inventor： Lyle C. Adams

IPC: G05B19/416 ,  G05B13/00

CPC classification number: G05B19/4163

Abstract: A circuit for controlling the application of an error compensation circuit in a feedback control system which in turn automatically controls the feedrate of a machine tool apparatus such as a milling machine. Sensors positioned adjacent the spindle of the apparatus measure the amount of force on the spindle under load conditions, and provide an electrical signal output. The electrical signal includes an error component, substantially caused by the revolving mechanial components of the apparatus, such as the spindle, being out of true. If the electrical signal provided by the sensors does not exceed a pre-established threshold voltage, a low-pass compensation filter is applied in the feedback control system, removing the error component but introducing a time constant into the electrical signal and hence a delay in feedback control. If the pre-established threshold voltage is exceeded, however, certain portions of the low-pass filter are bypassed, eliminating the time constant delay and providing a quick feedback control response to large and potentially harmful magnitudes of spindle load.

Abstract translation: 用于控制在反馈控制系统中应用误差补偿电路的电路，反馈控制系统又自动控制诸如铣床的机床装置的进给速度。 位于设备主轴附近的传感器在负载条件下测量主轴上的力的大小，并提供电信号输出。 电信号包括基本上由诸如主轴的装置的旋转机械部件引起的误差分量，这是错误的。 如果由传感器提供的电信号不超过预先建立的阈值电压，则在反馈控制系统中应用低通补偿滤波器，去除误差分量，但是将时间常数引入到电信号中，因此延迟 反馈控制。 如果超过了预先建立的阈值电压，低通滤波器的某些部分被旁路，消除了时间常数延迟，并且提供了对主轴负载的较大和潜在有害大小的快速反馈控制响应。