JPS62256005A - Nc device - Google Patents

Abstract

PURPOSE:To obtain a mechanical locus as instructed by an NC data, by forecasting an error generated by the on-line simulation of the locus of a machining tool, and inputting the locus on which is applied the error correction, to a servo driving system. CONSTITUTION:An NC data analyzer 2 analyzes an NC data 1, and divides a theoretical locus (a) on which the machining tool should move. A mechanical locus simulator 6 finds a simulation locus (b) corresponding to the actual locus of the machine including the errors of a mechanical system and a servo system, by performing a simulation. The obtained simulation locus (b) is compared with the theoretical locus (a) instructed by the NC data by a locus error divider 7, then a locus error (c) is divided. The divided locus error (c) is converted to a correction quantity (d) by a correction quantity calculator 8, and a correction quantity adder 9 adds the correction quantity (d) on the theoretical locus (a) instructed by the NC data. In this way, an execution locus (e) on which the errors of the mechanical system, and the servo system, are compensated, is outputted from the correction quantity adder 9.

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to an NC device for a machine tool.

<Prior art> As shown in Fig. 2, NC data 1 is analyzed by an NC data analyzer 2, and after determining the NC trajectory, a pulse distributor 3 distributes pulses to each axis and sends commands to the servo of each axis. The signal was passed to an amplifier 4 to drive a servo motor 5 to control the movement of the machine tool.

<Problems to be Solved by the Invention> According to the above-mentioned prior art, the NC locus passed to the pulse distributor 3 is the exact locus commanded by NC data, so the machine tool distributes pulses on that locus. When the machine tool is moved, there is a problem in that the tool of the machine tool moves away from the trajectory commanded by the NC data due to the characteristics of the machine tool, servo characteristics, etc., resulting in an error. In other words, in the conventional technology, control was performed without considering deviations due to machining or servo characteristics.

SUMMARY OF THE INVENTION In view of the above-mentioned prior art, it is an object of the present invention to provide an NC device that can perform highly accurate machining.

<Means for solving the problems> The configuration of the present invention achieves the above object by simulating the theoretical trajectory determined by analyzing NC data, including errors in the mechanical system and servo system. , an 8i machine trajectory simulator that calculates a simulation trajectory that corresponds to the actual trajectory of a machine tool, a trajectory error calculator that calculates the trajectory error between the theoretical trajectory and the simulation trajectory, and calculates the optimal correction amount to compensate for the trajectory error. It is characterized by being equipped with a correction amount calculator that calculates the amount of correction, and a correction amount adder that adds the calculated correction amount to the theoretical trajectory to obtain an execution trajectory and sends this execution trajectory to the servo system of the work 81 castle. do.

<Operation> In order to solve this problem, the present invention calculates the trajectory of the machine 8i online, predicts the error that will occur, and sends the trajectory corrected for the error to the servo drive system. By entering, the result is NC
Be able to obtain the machine trajectory commanded by data.

Practical example Embodiments of the present invention will be described in detail below with reference to FIG.

As shown in the figure, the NG data analyzer 2
ri! M-fold and determine the theoretical locus a along which the machine tool should move. The machine trajectory simulator 6 calculates 8! based on the determined theoretical trajectory a, including the errors of the tiiWt system and the servo system. A simulation trajectory corresponding to the actual trajectory of the machine is obtained through simulation.

The obtained simulation trajectory S is compared with a theoretical trajectory a commanded by NC data by a trajectory error calculator 7, and a trajectory error C is determined. The cut-out trajectory error C is converted into a correction amount d by the correction amount calculator 8.

The correction amount adder 9 adds the correction amount d to the theoretical locus a commanded by the NC data. Therefore, from the correction amount adder 9,
An execution trajectory e that compensates for errors in the mechanical system and servo system should be output. This execution trajectory e is pulse distributed to each axis by a pulse distributor 3, and a servo motor 5 is driven by a servo amplifier 4 for each axis. Thus, the actual trajectory of the tool of the machine tool matches the theoretical trajectory a commanded by NC data 1,
Accurate processing is possible.

<Effects of the Invention> As specifically explained above in conjunction with the embodiments, according to the present invention, errors in the 81M system and servo system are compensated for, so highly accurate NC processing can be performed.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional technique. In the drawing, 1 is NC data, 2 is NC data analysis group, 3 is a pulse distributor, 4 is a servo amplifier, 5 is a servo motor,
6 is a machine trajectory simulator, 7 is a trajectory error calculator,
8 is a correction amount calculator, and 9 is a correction amount adder.

Claims (1)

[Claims] A machine trajectory simulator that calculates a simulation trajectory corresponding to the actual trajectory of a machine tool by simulating a theoretical trajectory determined by analyzing NC data, including errors in the mechanical system and servo system. , a trajectory error calculator that calculates the trajectory error between the theoretical trajectory and the simulation trajectory, a correction amount calculator that calculates the optimal correction amount to compensate for the trajectory error, and a correction amount calculator that adds the calculated correction amount to the theoretical trajectory. An NC device characterized by comprising a correction amount adder for determining an execution trajectory and sending this execution trajectory to a servo system of a machine tool.