JPS6010306A - Numerical controller - Google Patents

Abstract

PURPOSE:To improve the working efficiency by connecting a laser length measuring machine to a numerical controller (NC) such as numerical control machine tool and having only to input a total moving distance of a machine to the NC so as to form automatically a pitch error correcting data. CONSTITUTION:A length measuring machine 10 such as a laser length measuring machine is set so as to measure a moving amount of a moving part of a machine tool or the like whose pitch error of a feeding screw is desired to be corrected and connected to an interface circuit 7. The total moving amount of one axis for the machine tool or the like desired for pitch error correction is inputted from a manual input device 6. The difference between a measured value from the machine 10 and each correcting point is obtained and a correcting amount is calculated and stored in a nonvolatile memory 5 at each correcting point. When the NC is moved according to the NC processing program, the correction data stored in the memory 5 is read and corrected, and a position command is outputted in response to the position command from this program.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application and Prior Art The present invention relates to a numerical control device that can automatically create pitch error correction data for a feed screw in a mechanical system driven by the numerical control device.

Numerical control equipment (hereinafter N) is used in numerically controlled machine tools, etc.
The motor is driven based on the command from g (referred to as C),
The feed screw rotates and moves the movable part of the machine tool to the commanded position, but the feed screw is not ideally accurate (there is some variation. Therefore, in order to accurately position the It is necessary to correct the variation in the feed screw.

Therefore, in the past, the movable part was first moved to the point to be corrected, the distance it moved was measured with a laser length measuring device, etc., the value was compared with the command value from the NC, and the difference, that is, the error, was corrected. It is input as data to the NC and stored. A large number of such correction points are provided for each axis (for example, 2 points per axis).
56 points), the above-mentioned processing was performed on all correction points, and the correction data was stored in NG.

OBJECTS OF THE INVENTION An object of the present invention is to provide a numerical control device that can automatically create and store the above correction data.

Structure of the Invention As shown in the block diagram of the invention shown in FIG. A correction interval calculation means RPM that calculates a correction point interval from the total movement amount, and a correction point movement command means that issues a movement command to move a movable part of the machine or a movable part such as a tool to each correction point based on the correction point interval. RRM, distance measurement data input means LMM for inputting measurement data at each correction point from a measuring device that measures the amount of movement of the movable part, a movement command value obtained from the correction point movement command means, and the distance. It has a correction amount calculation means RCT that calculates a correction amount based on the measurement data obtained from the measurement data input means, and correction amount storage means R, MM that stores the correction amount calculated from the correction amount calculation means. This is a numerically controlled device that can automatically obtain feed screw pitch error correction data for each axis.

Embodiment FIG. 2 is a block diagram of an embodiment of the present invention, and 1 is NG.
2 is a central processing unit, 3 is a ROM in which a control program for controlling the entire NG system is stored, 4 is a RAM used for arithmetic processing, etc., and 5 is a stroke length of the machine tool, that is, the total travel distance. A W-proof memory that stores correction data at all correction points, 6 a manual input device for inputting the stroke length of a machine tool, etc., 7 connected to a measuring device 10 for measuring length such as a laser length measuring device 8 is an interface circuit for connecting the servo circuit. Note that 9 is a bus.

Next, the operation of this embodiment will be explained together with the process shown in FIG.

First, a length measuring device 10 such as a laser sub-length device is set so as to be able to measure the amount of movement of a movable part of a machine tool or the like in which the pitch error of a feed screw is to be corrected, and is connected to the interface circuit 7. Next, from the manual input device H6, the total movement amount of one axis of the machine tool, etc. for which pitch error correction is to be performed,
That is, when the total stroke (1) is input and processing is started, CPLJ 2 first divides the total stroke set above by the number of correction points, and if the number of correction points is 256, then the above The total stroke is divided by 256 to calculate the correction interval (Jl/256) (step 82). Next, move to the correction start point automatically or manually! (Step S3), wait for a certain period of time until the i-machine is stationary and ready for measurement (Step S4), and then read data, that is, distance, from the measuring device 10 via the interface circuit 7 (Step Ss). Then, the correction amount is calculated by calculating the difference between the measured value from the measuring device 10 and the command position, that is, the correction start point since it is the first in this case (step S6).
Next, the correction amount thus obtained is stored in the nonvolatile memory 5 for each correction point (step 87). Next, it is determined whether the correction amounts for all correction points have been calculated, that is, in the above example, whether the correction amounts for 256 correction points have been calculated (step S8), and if the correction amount has not been calculated, it is determined at one correction interval. (i/256) Move (step S9), and perform the processing from step S4 again.

Then, when the correction amount is calculated for all correction points,
Similar processing is performed for the next axis, and pitch error correction data will be obtained in the non-volatile memory 5 for all axes. Then, when the NC moves according to the NG Niprogram, the correction data stored in the nonvolatile memory 5 is read and corrected in response to a position command from the NC Niprogram, and a position command is output. become.

Effects of the Invention As described above, the present invention allows pitch error correction data to be generated by simply connecting a length measuring device such as a laser length measuring device to NO and inputting the total moving distance of the machine to N and C. Since it can be created automatically, there is no need for the troublesome processing required in the past, which improves work efficiency.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the present invention, FIG. 2 is a hardware block diagram of an embodiment of the present invention, and FIG. 3 is an operational flow of the embodiment of the present invention. Patent Applicant Fasu Ri JP-A-60-103tlG (3)

Claims (1)

[Claims] For each axis in a machine controlled by a numerical control device,
total movement amount input means for inputting the total movement amount of the axis; correction interval calculation means for calculating the correction point interval from the total movement amount; and movement for moving the movable part of the machine to each correction point based on the correction point interval. correction point movement command means for issuing a command; distance measurement data input means for inputting measurement data at each correction point from a measuring device for measuring the amount of movement of the movable part; and movement obtained from the correction point movement command means. The correction amount calculating means calculates the correction amount based on the command value and the measurement data obtained from the measurement data input means, and the correction amount storage means stores the correction amount calculated from the correction D'tR mountain means. A numerical control device characterized by: