JP2000305613A - Machine tool correcting method for three-dimensional laser beam machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable high-accuracy working even when the attitude of a machine tool is changed by calculating correction values corresponding to respective attitudes, registering these values in an NC device and automatically correcting the machine tool by calling the correction value corresponding to a change when the attitude of the machine tool is changed in the case of working. SOLUTION: The upper surface of a casing is placed parallel with an X-Y coordinate plane on the working machine (S1). A rectangular hole A is worked in an attitude 1 (S2) and the central coordinate of the rectangular hole A is defined as (X, Y)-(X0, Y0). A rectangular hole B is worked in a next attitude 2 (S3) and the central coordinate of the rectangular hole B is defined as (X, Y)-(X0+α, Y0). After working, dimensions ΔX and ΔY are measured (S4). Therefore, the correction value of the attitude 3 corresponding to the attitude 1 is ΔX-α in X direction and ΔY in Y direction (S5). This correction value is registered in the NC device as a correction value corresponding to the attitude 3 (S6). When the attitude 1 is changed to the attitude 3, it is corrected on the basis of the registered correction value (S7).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for correcting a tool of a three-dimensional laser processing machine when performing a three-dimensional laser processing by a laser processing machine having a tool having a plurality of degrees of freedom.

[0002]

2. Description of the Related Art Referring to FIGS. 7, 8 and 9, a machining head 1 which is a tool having three degrees of freedom of X, Y, and Z straight lines and two axes of rotation, which is more common than conventional ones, is provided. In the three-dimensional laser beam machine 3, when performing three-dimensional machining under the control of the NC device 5, the C-axis and the A-axis are rotated, and the posture of the machining head 1 is taken in the normal direction of the machining surface of the workpiece W. The three-dimensional machining program at this time is created by teaching using a teaching box 7 as shown in FIG. 8 or by an automatic programming device 9 as shown in FIG.

[0003]

However, in such a conventional technique, the machining accuracy when performing three-dimensional machining with a program created by teaching is determined by the accuracy of teaching, and the three-dimensional machining by teaching is performed. Then, the required accuracy is generally rough.

On the other hand, when machining is performed using a program created by the automatic programming device 9, the relative relationship between machining positions is clear. Therefore, when processing the housing W shown in FIG. 10, the X, Y, Z
When processing is performed by setting each surface of the housing W to be parallel to the axis, the processing accuracy is obvious by measuring the dimensions of X1 and X2.

[0005] Here, when the attitude of the processing head 1 is changed from the attitude to the attitude without changing the X, Y, and Z coordinates, there is a problem of the misalignment of the laser light core. In the case shown in FIG. 10, X1 and X2 should have the same value in the program, but when actually processed parts are measured, X1 and X2 are different.

The cause of this error is that the laser beam shifts due to the movement of the optical parts when the posture changes.

SUMMARY OF THE INVENTION An object of the present invention is to pay attention to the prior art described above, and realizes high-precision machining by preventing the laser beam from being displaced even when the posture of the tool changes. To provide a tool correction method for a three-dimensional laser beam machine.

[0008]

According to a first aspect of the present invention, there is provided a tool correcting method for a three-dimensional laser beam machine having a plurality of degrees of freedom with respect to a linear axis and a rotary axis. In the tool correction method for a three-dimensional laser beam machine, a deviation when the posture changes from an arbitrarily determined basic posture of the tool is measured, and a correction value for each posture is calculated from the measured value and registered in the NC device. It should be noted that, when the attitude of the tool changes during machining, a correction value corresponding to the change is called up and the correction is automatically performed.

Therefore, when the posture of the tool is changed from a predetermined basic posture, a correction value for the changed posture is obtained from the deviation of the position where the laser beam is actually irradiated, and registered in the NC device. When the attitude of the tool changes in actual machining, the NC apparatus calls up a correction value for the changed attitude and automatically corrects it.

According to a second aspect of the present invention, there is provided a tool correcting method for a three-dimensional laser processing machine according to the first aspect, wherein the three-dimensional laser processing is performed on a rectangular or cubic casing. If this is the case, the housing is set so that each surface of the housing is parallel to the coordinate plane of the three linear axes, and the other 11 postures with respect to the arbitrarily defined one basic posture of the tool are set. Is registered in the NC device.

Therefore, when each surface of the rectangular parallelepiped or the cube is set so as to be parallel to the coordinate plane, there are 12 possible postures of the tool for irradiating each surface with a laser beam at a right angle. One of these is adopted as a basic posture, errors in the other 11 postures are measured and registered in the NC device, and a correction value for the posture of the tool is automatically called upon actual machining. Make corrections.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings.

Referring to FIG. 3, there are four postures of the machining head 1 as a tool for machining the housing W, C = 0 °, 90 °, 180 °, 270 ° A = 0 ° with respect to the upper surface. , C = 0 ° and A = 90 ° for one side,
C = 180 °, A = −90 °, 4 sides
There are 8 positions on the side, so there are 12 positions in total.

Therefore, the position (1) shown in FIG. 3 is adopted as a reference, and the position shifts of the other 11 positions of the laser beam are measured.
This value is registered in the NC device 5 as a correction value, and the posture (1)
In the other 11 postures, the X, Y, and Z coordinates are corrected based on this data so as to eliminate the deviation of the laser beam.

That is, the correction in the processing of the upper surface WU of the housing W will be specifically described with reference to FIGS.

When the process is started (step SS), first, the upper surface WU of the housing W is placed parallel to the XY coordinate plane of the processing machine (step S1). The square hole A is machined in the posture (1) (step S2).

At this time, the center coordinates of the square hole A are (X, Y)
= (X0, Y0). Next, the square hole B is machined in the posture (3) (step S3). At this time, the center coordinates of the square hole B are (X, Y) = (X0 + α, Y0).

After processing, the dimensions ΔX and ΔY are measured (step S4). From now on, posture (3) with respect to posture (1)
Are ΔX−α in the X direction and ΔY in the Y direction (step S5). Here, for example, when α = 50, the correction value in the X direction is ΔX−50.

The obtained correction value is registered in the NC unit 5 as a correction value for the posture (3) (step S6). Thereafter, when the attitude changes from the attitude (1) to the attitude (3), the positions in the X and Y directions are corrected based on the correction values registered in the NC device 5 (step S7, see FIG. 6), and the correction is performed. The process ends (step SE).

Next, with reference to FIG. 2 and FIGS. 5 and 6, the correction in the processing of the side surface will be described.

When the process is started (step SS), first, each surface of the housing W is made parallel to each coordinate plane of the processing machine (step S8), and the square hole A is processed in the posture (1) in FIG. Step S9). At this time, the X coordinate of the center of the square hole A is X = X0, and the Z coordinate of the upper surface is Z = Z0. Next, the square hole C is machined in the posture (5) (step S10).

At this time, the center coordinates of the square hole C are (X, Z)
= (X0, Z0 + β). After processing, dimensions ΔX, ΔZ
Is measured (step S11). From now on, posture (1)
Is (Δ) in the X direction and ΔZ−β in the Z direction (step S12). Here, for example, when β = 50, the Z-direction correction value is ΔZ−50.

The obtained correction value is registered in the NC unit 5 as a correction value for the posture (5) (step S13). Thereafter, when the attitude changes from the attitude (1) to the attitude (5), the positions in the X and Z directions are corrected based on the correction values registered in the NC device 5 (step S14, see FIG. 6), and the correction is performed. The process ends (step SE).

From the above results, the shift of the processing position due to the change in the attitude of the processing head 1 is registered in the NC device 5 as a correction value for the basic attitude, and is registered when the attitude of the processing head 1 changes. Since the correction is automatically performed using the correction value, even if the attitude of the processing head 1 changes, the processing can be performed with high precision without shifting the processing position.

It should be noted that the present invention is not limited to the above-described embodiment of the present invention, but by making appropriate changes,
It can be implemented in other aspects. That is, in the above-described embodiment, a rectangular parallelepiped or a cube in which each plane is orthogonal to each other has been mainly described, but the present invention can be similarly applied to a case where each plane intersects at a different angle. In this case, the number of changes with respect to the basic posture differs depending on the number of surfaces constituting the housing.

In the above-described embodiment of the present invention, the processing head 1 having three linear axes and two rotary axes of freedom.
However, the degree of freedom is not limited to this.

[0027]

As described above, in the tool correcting method for a three-dimensional laser beam machine according to the first aspect of the present invention, when the posture of the tool changes from a predetermined basic posture, the laser beam is actually irradiated. A correction value for the changed posture is obtained from the positional deviation and registered in the NC device, and when the posture of the tool changes in actual machining, the NC device calls the correction value for the changed posture. Since the correction is automatically performed, high-precision machining can be performed even if the posture of the tool changes.

In the tool correcting method for a three-dimensional laser beam machine according to the second aspect of the present invention, when each surface of a rectangular parallelepiped or a cube is set so as to be parallel to a coordinate plane, a laser beam is irradiated at right angles to each plane. There are 12 possible postures of the tool. One of these is adopted as a basic posture, errors in the other 11 postures are measured and registered in the NC device, and a correction value for the posture of the tool is automatically called upon actual machining. Since the correction is performed, high-precision machining can be performed even if the posture of the tool changes.

[Brief description of the drawings]

FIG. 1 is a flowchart illustrating an example of a tool correction method for a three-dimensional laser beam machine according to the present invention.

FIG. 2 is a flowchart showing another example of the tool correction method for the three-dimensional laser beam machine according to the present invention.

FIG. 3 is an explanatory view showing a possible attitude of a processing head with respect to a rectangular parallelepiped or cubic casing;

FIG. 4 is an explanatory diagram showing an example of correction value measurement.

FIG. 5 is an explanatory diagram illustrating another example of correction value measurement.

FIG. 6 is an explanatory diagram showing correction in processing.

FIG. 7 is a perspective view showing a processing head that is more common than the conventional one.

FIG. 8 is an explanatory diagram of three-dimensional teaching.

FIG. 9 is an explanatory diagram showing three-dimensional processing by an automatic program.

FIG. 10 is an explanatory diagram illustrating an example of three-dimensional processing.

[Description of Signs] 1 Processing head (tool) 3 Laser processing machine 5 NC device W Housing

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Claims (2)

[Claims] In a tool correction method for a three-dimensional laser beam machine having a plurality of degrees of freedom tools with respect to a linear axis and a rotation axis, a displacement of the tool when an attitude changes from an arbitrarily determined basic attitude is measured. Then, a correction value for each posture is calculated from the measured values and registered in the NC device, and when the posture of the tool changes during machining, a correction value corresponding to the change is called to automatically perform the correction. A tool correction method for a three-dimensional laser beam machine. 2. When the three-dimensional laser processing is performed on a rectangular parallelepiped or cubic casing, the casing is set so that each surface of the casing is parallel to a coordinate plane of three straight axes. 2. The tool correction method for a three-dimensional laser processing machine according to claim 1, wherein correction values for another 11 postures with respect to one arbitrarily determined basic posture of the tool are registered in an NC device.