PURPOSE: To change a correction value according to the variation in displacements and to smoothly correct displacement by storing correction data by measuring the displacement of a structure by the movement of a moving body, detecting the movement of the moving body by an NC control device and outputting correction data.
CONSTITUTION: The displacement of a cross beam 16 is measured by moving a cutting tool base 17 by abutting the dial indicator fitted to the tip of a cutting tool rod 18 to the straight edge fixed on a table 12 and the correction data based on the measurement result are stored by inputting to a correction control device 5. When the cutting tool base 17 starts its movement by the command of an NC control device and the correction point stored in the correction control device 5 is detected by a position detector, the correction data of a memory is called, the feeding direction is discriminated, the data of the succeeding correction point are read, the current moving body position is calculated from the correction point detecting the position by feeding speed and a clock signal and in case of exceeding the min. unit calculating an interpolation correction value the pressure fed to hydraulic cylinders 31, 33 is adjusted by outputting the result and controlling a proportional electromagnetic type control valve 2. The power corresponding to the pressure is then generated and the deflection of the cross beam 16 and the torsion of a column 15 are corrected.
OCHIAI AKIRA
FUJII AKIO
| JPS4956274A | 1974-05-31 | |||
| JPS51138286A | 1976-11-29 | |||
| JPS62162478A | 1987-07-18 | |||
| JPS5415148A | 1979-02-03 |