Apparatus and method for eliminating dimensional error of processed workpieces by feedback-adjusting working condition

摘要

A feedback compensating apparatus (28, 32, 120, 122) for adjusting the working condition of a working machine (10, 110) of a working system adapted to process working portions of successive workpieces under control of a machine controller (22, 114), which determines the working condition from an extraneous signal. The apparatus is used with the controller and a measuring device for measuring the dimensions of the processed working portions of the workpieces, and includes a device (28, 32, 120, 122) for obtaining dimensional data based on outputs of the measuring device (14, 18, 112, 116) during and/or after a working operation of the machine on each workpiece. The dimensional data include a dimensional error (R) of the processed working portions, and a variable (T, D) indicative of a tendency of change in the dimensional error. The apparatus further includes a device (28, 32, 120, 122) for determining the extraneous signal based on the dimensional data, and applying the signal to the machine controller (22, 114) to adjust the working condition of the machine. Also disclosed is a method of processing workpieces using the apparatus.