Method and apparatus for adaptive programmed control of a turning machine tool

Claim 2

In a method for adaptive programmed control of a turning machine tool for removal of material from a workpiece by programmed processing sections during processing cycles, including the steps of rapidly feeding the tool until it comes into contact with a workpiece, work feeding the tool up to a maximum to the programmed contour until a magnitude depending upon the forming power and the material removing rate exceeds a lower threshold level, reducing the work feeding and movement of the tool in the direction of reduced feed-in for a period of time until the magnitude depending upon the forming power falls below an upper threshold level, and work feeding the tool repeatedly until the actual contour of the workpiece coincides with a programmed contour, the improvement comprising the steps of deriving the deviation Xu of the actual contour of the workpiece from the finished programmed contour during each of the processing cycles at the end of each programmed processing section; comparing the programmed contour of the workpiece in the nextsucceeding programmed processing section with the derived deviation Xu to provide a comparison result during each of the processing cycles at the end of each programmed processing section; and eliminating or utilizing the next-succeeding programmed processing section in accordance with the comparison result.

Claim 3

A method as claimed in claim 1, wherein the programmed processing section includes a programmed change Xe in the contour of the workpiece and wherein the next-succeeding programmed processing section is eliminated when the derived deviation Xu exceeds the programmed change Xe of the contour in the next-succeeding programmed processing section and when the derived deviation Xu is less than the programmed change Xe of the contour in the next-succeeding processing section only the difference between the programmed change Xe in the processing section and the derived deviation Xu is utilized to control the machine tool, and further comprising the step of altering the derived deviation Xu for the processing section following the next-succeeding processing section when the derived deviation Xu exceeds the programmed change Xe of the contour in the next-succeeding programmed processing section.

Claim 4

A method as claimed in claim 1, wherein all the programmed processing sections are fed in only during the first processing cycle and the section which starts the next cycle after the first is determined by the deviation of the programmed contour.

Claim 5

In apparatus for adaptive programmed control of a turning machine tool for removal of material from a workpiece by programmed processing sections during processing cycles, including feeding means for rapidly feeding the tool until it comes into contact with a workpiece, and work feeding means for work feeding the tool up to a maximum to the programmed contour until a magnitude depending upon the forming power and the material removing rate exceeds a lower threshold level and for reducing the work feeding and movement of the tool in the direction of reduced feed-in for a period of time until the magnitude depending upon the forming power falls below an upper threshold level, said work feeding means operating repeatedly until the actual contour of the workpiece coincides with a programmed contour, the improvement comprising deriving means for deriving the deviation Xu of the actual contour of the workpiece from the fiNished programmed contour during each of the processing cycles at the end of each programmed processing section; deviation memory means coupled to said deriving means for storing the derived deviation Xu; final value memory means for storing the programmed change Xe of the contour in the next-succeeding programmed processing section; comparing means connected to said deviation memory means and said final value memory means for comparing the programmed contour change Xe of the workpiece in the next-succeeding programmed processing section with the derived deviation Xu stored in said memory means to provide a comparison result during each of the processing cycles at the end of each programmed processing section; and circuit means coupled between said comparing means and said memory means for eliminating or utilizing the next-succeeding programmed processing section in accordance with the comparison result.

Claim 6

In apparatus for adaptive programmed control of a turning machine tool for removal of material from a workpiece by programmed processing sections during processing cycles, including feeding means for rapidly feeding the tool until it comes into contact with a workpiece, and work feeding means for work feeding the tool up to a maximum to the programmed contour until a magnitude depending upon the forming power and the material removing rate exceeds a lower threshold level and for reducing the work feeding and movement of the tool in the direction of reduced feed-in for a period of time until the magnitude depending upon the forming power falls below an upper threshold level, said work feeding means operating repeatedly until the actual contour of the workpiece coincides with a programmed contour, the improvement comprising deriving means for deriving the deviation Xu of the actual contour of the workpiece from the fiNished programmed contour during each of the processing cycles at the end of each programmed processing section; deviation memory means coupled to said deriving means for storing the derived deviation Xu; final value memory means for storing the programmed change Xe of the contour in the next-succeeding programmed processing section; comparing means connected to said deviation memory means and said final value memory means for comparing the programmed contour change Xe of the workpiece in the next-succeeding programmed processing section with the derived deviation Xu stored in said memory means to provide a comparison result during each of the processing cycles at the end of each programmed processing section; and circuit means coupled between said comparing means and said memory means for eliminating or utilizing the next-succeeding programmed processing section in accordance with the comparison result.