JPH05127729A - Cnc controller - Google Patents

Abstract

PURPOSE:To provide the CNC controller which is equipped with an additional function for displaying dimensional error in machining size and easily evaluates CP control with high precision. CONSTITUTION:This CNC controller for orthogonall XY control which machines a plane shape by combining straight lines and arcs is equipped with a means 8 which calculates a machine position by adding feedback pulses (FB pulse) read in at each sampling period to an initial value at starting time, means 10, 11, 12, and 13 which calculate the dimensional error in machine position based upon a target track along the direction of the normal of the target track from (a) and (b), and the machine position when the target track is a straight line expressed by y=ax+b or (r), arc center coordinates, and the machine position when the target track is the arc having a radius (r), and means 14 and 15 which displays the target track and the track of the dimensional error on an enlarged scale based upon the target track.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is equipped with a trajectory accuracy evaluation function, and can perform on-the-machine measurement easily.
The present invention relates to an NC control device.

[0002]

2. Description of the Related Art In a conventional CNC controller for continuous ring control (hereinafter referred to as CP control), the accuracy of a cut sample cut as CP control evaluation is measured by a three-dimensional measuring instrument or the circumference of a circle. Alternatively, the circularity is measured by rotating the outer circumference while measuring. In many cases, users did not have the above measuring instruments, and it was difficult to perform accurate evaluation.

[0003]

In such a conventional method, the CP control evaluation could not be easily and highly accurately evaluated.

The present invention solves such a problem, and a feedback pulse (hereinafter referred to as F
(It is referred to as B pulse). By adding the function of evaluating the locus accuracy, the CP control can be evaluated easily and accurately.
An object is to provide a C control device.

[0005]

In order to achieve the above object, the CNC control device of the present invention comprises means for adding a feedback pulse to be read at each sampling cycle to an initial value at the start, and calculating a machine position. The target locus is y =
When the straight line is ax + b, a, b and the machine position are used. When the target trajectory is an arc having a radius r, r, the center coordinates of the arc, and the dimensional error of the machine position with respect to the target trajectory from the machine position to the target trajectory passing through the machine position. It is provided with a means for calculating along the direction of the normal line and a means for displaying the locus of the above-mentioned dimensional error on a scale enlarged based on the target locus and the target locus.

[0006]

The accuracy of the CP control is displayed in an easy-to-understand manner by the target locus and the dimensional error locus.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a CNC controller according to the present invention. In FIG. 1, 1 is a CNC controller, 2 is a laser machine, 20 is an XY table, 3
Is an X-axis motor, 4 is a Y-axis motor, and 5 is an FB pulse. First, according to the command output from the CNC control device 1, the X-axis motor 3 and the Y-axis motor 4 are driven while feeding back the FB pulse output from each motor, and the XY table 20 is moved to be processed by the laser machine 2. To do.

FIG. 2 is a flow chart showing a trajectory accuracy evaluation function added to the CNC controller 1. In FIG. 2, in step 8, the FB pulse is added to the previous machine position to calculate the current machine position (xn, yn). In step 9, it is determined whether the locus that is currently cut is a circular arc or a straight line, and if it is a straight line, the inclination a and the initial value b of the straight line are read in step 10. Next, in step 11, a, b, (x
Compute the trajectory error using (n, yn). If it is an arc in step 9, in step 12 the radius r and the center point (x
0, y0) is read. Next, in step 13, r, (x
0, y0), (xn, yn) is used to calculate the trajectory error. Next, in step 14, the target trajectory is displayed on the screen, and in step 15, the trajectory error is magnified n times in the tangential direction with the target trajectory as a reference and displayed. In step 16, it is judged whether it is the end of the locus, and if it is in the middle, the process returns to step 8 to continue the repeated calculation and display, and the display is completed at the end of the locus.

Next, the formula for calculating the error between the actual locus 6 and the target locus 7 will be described with reference to FIGS. (I) In the case of a straight line, the error ln in (a) is ln = (xn-yn / a + b / a) * sin (tan ^-1 a) (ii) In the case of a circular arc, the error ln in (b) is ln = r - represented by ^{((xn + x0) 2 +} (yn-y0) 2) 1/2.

Next, referring to FIG. 4, a method for displaying the actual locus 6 on the screen in an easy-to-see manner will be described. The distance ln from the target locus 7 to the actual locus 6 is extended n times in the normal direction with respect to the target locus to magnify the error and display it 17 to make the accuracy of CP control easy to understand.

[0012]

As is apparent from the above description, the CNC control device of the present invention can easily perform CP control evaluation with high accuracy by adding the function of evaluating the trajectory accuracy from the FB pulse.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a CNC control device of the present invention.

FIG. 2 is a flow chart of trajectory accuracy evaluation in the embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a calculation formula of trajectory accuracy in the embodiment of the present invention.

FIG. 4 is an explanatory diagram of trajectory accuracy display in the embodiment of the present invention.

[Explanation of symbols]

 1 CNC control device 2 Laser machine 3 X-axis motor 4 Y-axis motor 5 FB pulse (feedback pulse) 6 Actual locus 7 Target locus

Claims (1)

[Claims] 1. A means for calculating a machine position by adding a feedback pulse read at every sampling cycle to an initial value at the start, and when the target locus is a straight line of y = ax + b, from a, b and the machine position, When the target locus is an arc having a radius r, a means for calculating the dimensional error of the machine position relative to the target locus from r, the arc center coordinates, and the machine position along the direction of the normal line of the target locus passing through the machine position; And a means for displaying the locus of the dimensional error on an enlarged scale with the target locus as a reference.