JPH03129503A - Numerical controller having y axis pitch error correcting function - Google Patents

Abstract

PURPOSE:To improve the positioning accuracy of Y axis control by previously converting pitch error data based upon pitch error data measured on a Y axis and inputted into angular data based upon control relation between the turning angle and position of a turret and correcting the pitch error of a rotation axis. CONSTITUTION:A Y axis command value is read out from a program memory at first and then the read value is divided into a turrent turning angle and an X axis correcting value by an X axis/turrent turning axis converting part 2. Data previously inputted to a Y axis pitch error correcting data input part 5 as a Y axis pitch error are converted into a turret turning axis correcting angle and stored in a turret rotation correcting angle storing part 7 and a turret turning angle command part 8 inputs the turrent turning angle from the conversion part 2 and the turret rotation correcting angle from the storage part 7 and operates a turret rotation command and a turret rotation correcting angle based upon the input data to output a command to a turrent turning axis servo control part 11. Thus, the positioning accuracy of Y axis control can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention is based on the YI glaze composition by combining two glazes: the turret rotation axis and the X axis.
The present invention relates to a numerical control (hereinafter referred to as NG) device having a function of correcting a Y-axis pitch error caused by Iilh control.

(Prior art) Methods for implementing Y@ control in NG lathes include those that move the main spindle in the YMb direction, those that attach an attachment to the tool rest and move the tool in the Y-axis direction, the C-axis,
Examples include a 3@h combination of X glaze and turret rotation axis, and a 211ilh combination of turret rotation axis and x glaze. FIG. 3 is a perspective view showing an example of a tool post that can control the Y axis by combining the two glazes of the turret rotation axis and the X axis.The turret 20 rotates around the turret rotation axis 23, and the Y! l! [11 The tool unit 21 is the unit rotation axis 2
The rotary tool of the Y-powered tool unit 21 rotates around 2.
A tool 24 is attached to 25. FIG. 4 is a diagram showing an example of the internal structure of the turret shown in FIG. 3, including a fixed gear 31 that does not move even when the turret I/foot 0 turns, and an intermediate gear whose rotation center is fixed to the turret 20. 32, a unit gear 33 that rotates together with the Y-axis tool unit 21, and a servo motor 34 for rotating the turret. Fifth
The figure shows how the turret 20 is rotated by the servo motor 34 to position the Y glaze. By rotating the turret 20 by the servo motor 34 for turret rotation, the intermediate gear 32 and unit gear 33, whose centers are fixed, rotate around the fixed gear 31. At this time, by the action of the intermediate gear 32 rotating around the fixed gear 31, the Y-axis tool unit 21 is positioned while maintaining parallel to the X-axis direction.

(Problem to be solved by the invention) As mentioned above, since Y@ control is realized by combining the two axes of the turret rotation axis and the X-axis, there is no actual linear axis that is driven as the Y-axis for Y-axis movement. , the rotation angle of the turret is more aligned with the Y-axis. Figure 6 shows the situation, Y'F+h tool unit 21 digit 1p
This shows that the angle changes depending on the tool post positioning angles a, b, c, d, e, and f.

Note that 41 in the figure indicates a turret reference angle.

Therefore, direct vA11 as Y glaze! II that corrects directly in the Yolk direction even if a pitch error correction value on Ih is given
Since there is no J axis, there is a drawback that pitch error correction of Yit cannot be performed.

The present invention was made in view of the above-mentioned circumstances, and an object of the present invention is to correct the Y-axis pitch error that occurs when positioning Y'l++b by combining the two axes of the turret rotation axis and the X-axis. The purpose of the present invention is to provide an NC device that can perform the following functions.

(Means for Solving the Problems) According to the present invention, as the turret rotates, the rotary tool attached to the turret remains parallel to
It has a tool rest structured to move in the I11 direction, and by controlling the angle using the rotation of the turret as the rotation axis, the Y! The present invention relates to an NC device that indirectly controls the position on the turret, and the above object of the present invention is to use pitch error data measured and input on the Y@ to control the rotation angle and position of the turret. Y! is converted into angle data in advance based on the control relationship, and when controlling the turning angle, the pitch error of the rotation axis is corrected using the angle data. This is achieved by performing a pitch error correction of lNl.

(Function) The center of rotation of the Ylith tool unit is fixed on the circumference of the turret, and Y-axis positioning errors occur due to excessive or insufficient rotation of the turret, and the cause is the pitch error of the gear that rotates the turret. Based on this, the present invention indirectly corrects the Y-axis pitch error by correcting the pitch error of the 1-knot turning axis of the beam. In the present invention, the Y-axis pitch error data is converted into the rotation angle of the turret in response to the Y-axis direction movement command value to the NC device, converted into angle data in advance, and set in the internal memory. Since error correction is performed based on , Y@pitch error correction is possible even in Y iqb by two-axis synthesis. Therefore, positioning accuracy during Y-axis control can be improved.

(Example) Examples of the present invention will be described in detail below based on the drawings.

FIG. 1 is a block diagram showing an example of the NC device of the present invention. This NC device reads the program memory 1 and sets the Yirl111 position read from the program memory 1 to
It has an X@/turret rotation axis conversion unit 2 that divides into two components: @ll correction amount and turret rotation angle. The X@ drive system receives the pitch error correction data storage section 3 of Xll1th, the amount of X-axis correction due to turret rotation, and the X! The X-axis correction distance command section 4 outputs a command to the X-axis servo control section 9 based on pitch error correction data of 11Ill, and the X-axis motor 10 is driven by the X-axis servo control section 9. In addition, the Y-axis drive system is used to manually input pitch error correction data for Y-glaze. 1III pitch error correction data input section 5; a Y-axis pitch error correction data conversion section 6 that converts Y-glaze pitch error correction data into angle data in advance;
A turret rotation correction angle storage section 7 that stores the converted data as a correction angle, a turret rotation angle command from the X-axis/turret rotation axis conversion section 2, and a turret rotation correction angle from the turret rotation correction angle storage section 7. The turret rotation angle command unit 8 outputs a command to the turret rotation axis servo control unit 11, and the turret rotation axis motor 12 is driven by the turret rotation axis servo control unit 11.

In such a configuration, first, the Y-axis command value is read from the program memory 1, and the X-axis/turret rotation axis conversion unit 2 divides it into the turret rotation angle and the xIith correction amount. X!
The 11111 correction amount is further subjected to X-axis pitch error correction in the X-axis correction distance command section 4, and the X-axis correction distance command section 4 outputs a command to the X-axis servo control section 9. On the other hand, the turret rotation angle is determined by the X-axis/turret rotation axis conversion unit 2, and the data is converted into a correction angle of the turret rotation axis by the Y-axis pitch error correction data input unit 5, which is input in advance as a Y-glaze pitch error. The correction angle storage section 7 stores the correction angle, and the turret rotation angle command section 8 calculates the turret rotation command and the turret rotation correction angle, and issues the command to the turret rotation axis servo control section 11 .

FIG. 2 is a flowchart showing the operation procedure of the NC device of the present invention.

First, the Y-axis command is entered into the Y-axis control mode (Step St), and the manually input Y-axis command is divided into the components of the X @ distance and turret rotation axis (Step S2).
! The X-axis pitch error is corrected for a distance of 1Ill (step S3), and the Y-axis pitch error is corrected for the turret rotation axis (step S4).
ILH processing is performed (step S5^, 55B). After that, it is determined whether or not to turn off the Y-axis control mode (step S6).
If the Y-axis control is to be continued, the above operations are repeated from step S1, and if the Y-axis control is to be ended, the process is completed after positioning at Y.0 (step S7).

(Effects of the Invention) According to the NC device of the present invention as described above, it is possible to correct the pitch error of the Y-axis even in Y-axis control using 2@joining commands, and it is possible to improve the positioning accuracy during Y@control. .

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of the NC device of the present invention, FIG. 2 is a flowchart showing an example of its operation, and FIG. 3 is 2IIiIl! A side view showing an example of a tool rest capable of Y-axis control by synthesis, and FIGS. 4 to 6 are diagrams showing examples of its operation. 1...Program memory, 2...X-axis/turret rotation axis conversion section, 3...X@pitch error correction data storage section, 4...X-axis correction distance command section, 5...Y-axis Pitch error correction data input section, 6... Y-axis pitch error correction data conversion section, 7... Turret rotation correction angle storage section, 8.
...Turret rotation angle command section, 9...X-axis servo control section, lO...x! T! Il! Motor, 11... Turret rotation axis servo control unit, 12... Turret rotation axis motor, 20... Turret, 21... Y glaze tool unit, 24... Tool. Figure 2

Claims (1)

[Claims] 1. As the turret rotates, a rotary tool mounted on the turret has a tool rest configured to move in the Y-axis direction while maintaining parallel to the X-axis, and the angle is controlled using the rotation of the turret as the axis of rotation. In a numerical control device that indirectly controls the position of the rotary tool on the Y-axis, pitch error data measured and input on the Y-axis is used to control the rotation angle and position of the turret. The pitch error of the Y-axis is corrected by converting it into angle data in advance based on the control relationship, and correcting the pitch error of the rotation axis using the angle data when controlling the turning angle. A numerical control device with Y-axis pitch error correction.