JPH03155484A - Automatic tool diameter correcting method for laser beam machine - Google Patents

Abstract

PURPOSE:To perform machining with high accuracy by inputting automatically a value obtained by overriding the tool diameter by reference conditions every time machining conditions are changed. CONSTITUTION:The detector side measures a groove width of a cut groove cut by the reference machining conditions based on a measuring command from the NC device side on a plate to be product-machined and obtains the reference correction quantity of the beam diameter from this and stores it in a memory on the NC device side. An NC control part of the NC device side reads optional machining conditions from a program statement and compares this with the reference machining conditions at an arithmetic processing part to obtain the correction quantity for the reference machining conditions. Meanwhile, the reference correction quantity stored in the memory is taken out and the value obtained by overriding the above-mentioned correction quantity on this reference correction quantity is transferred to the NC control part. Thus, the beam diameter corresponding to the optional machining conditions is corrected automatically.

Description

Detailed Description of the Invention [Object of the Invention] (Industrial Application Field) The present invention relates to an automatic tool diameter correction method for a laser processing machine.

(Prior art) The conventional method for setting tool diameter compensation is to include the following in the NC program statement:
This is done by setting which direction to offset the cutting path to the left or right, and then selecting a correction amount, which is set in advance in the setting parameters in accordance with the machining conditions, by number.

When setting the correction amount in the setting parameter in advance,
In the case of a carbon dioxide laser, the laser beam diameter, which corresponds to the tool diameter, cannot be directly measured due to invisible light. It was necessary to calculate and input the measured values. In addition, the tool diameter (beam diameter) changes depending on the machining conditions such as plate thickness, material, laser output, pulse duty ratio, and speed.
If the material or processing conditions changed, it was necessary to perform a test cut again, measure the dimensions, and re-enter the data.

(Problem to be Solved by the Invention) Generally, it is difficult for an operator to judge which part of the NC program statement the correction value of a certain part of the machined shape corresponds to, and The operation was complicated because settings had to be made on a screen other than the NC program statement. Furthermore, since the laser beam is not necessarily a perfect circle, the amount of correction in the X and Y directions may not be the same, and in this case, the amount of correction largely depends on the operator's intuition and experience.

This invention was created by focusing on these points, and the cutting width of a plate cut under certain basic conditions is determined by n1, and processing conditions such as output, pulse duty ratio, and speed are determined based on that value. This enables a laser processing machine that automatically inputs a value obtained by overriding the tool diameter based on the standard conditions each time the machining conditions change, allowing high-precision machining without the operator having to worry about tool diameter correction. The object is to provide an automatic tool correction method.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention cuts a plate material to be processed into a product in advance under standard processing conditions, and calculates the width of the beam from the cutting groove width. Determine the diameter, store the standard correction amount in memory based on this, and in the case of arbitrary machining conditions, compare it with the standard machining conditions and override the correction amount to the standard correction amount to correspond to the machining conditions. The beam diameter is automatically corrected.

(Function) With this configuration, the beam diameter corresponding to the reference processing conditions is actually measured in advance, and the reference correction amount of the beam trajectory calculated based on this is stored in the memory. Therefore, in the case of arbitrary machining conditions, by comparing with the standard machining conditions, determining the amount of correction for the standard machining conditions, and overriding this with the standard correction amount stored in the memory, The amount of correction for the beam diameter (tool diameter) is automatically determined.

(Example) Next, an example of the present invention will be described based on the drawings. FIG. 1 is a block diagram of an apparatus implementing the method of the invention. As shown, it is composed of a detection device side and an NC device side. The detection device side includes an optical detection device such as a CCD camera, an image processing section, a detection device control section, a cutting width measurement processing section, and the like. This detection device side detects in advance the l-
The groove width of a cutting groove cut under standard processing conditions based on a constant command is measured, a standard correction amount for the beam diameter is calculated from this, and this is stored in the memory on the NC device side.

The NC device side consists of an NC control section, an arithmetic processing section, a memory, etc. The NC control unit reads arbitrary machining conditions from the program statement, compares them with the standard machining conditions in the arithmetic processing unit, calculates the amount of correction for the standard machining conditions, and retrieves the standard correction amount stored in the memory and uses this standard. A value obtained by overriding the correction amount is transferred to the NC control section.

In this way, beam diameter correction corresponding to arbitrary processing conditions is automatically performed.

FIG. 2 is a flowchart showing an example of a method for measuring the reference correction amount. That is, step 1 (hereinafter abbreviated as S) starts measurement, step SL places the plate material to be processed into the laser processing machine, and step S3 sets the automatic tool correction program mode on the operation panel. select.

In S4, taking into account that the laser beam is not a perfect circle due to the standard processing conditions, cutting is performed in the X and Y directions, respectively, and S5
Then, the groove width of the cutting groove was determined by IIP+ using a CCD camera, and S6
Then, the average value of the groove widths in the X and Y directions is calculated, and in S7, the standard correction amount is determined from the average value of the groove widths, and this is stored in the correction amount variable of the NC device, and the process ends in S8. do.

FIG. 3 is a flowchart showing the execution of the Canadian program. That is, processing starts at Sl, and at Sl,
It is determined whether or not automatic tool correction is to be performed, and if automatic tool correction is to be performed, the process proceeds to S3; if not, the process proceeds to S7 and ends without executing the following program.

In S3, read the machining conditions from the NC program statement, and in S4
Then, the standard addition conditions stored in memory in advance and S3
Compare the machining conditions read in and calculate the amount of correction. In S5, the correction amount calculated in S3 is overridden by the reference correction amount for the reference machining conditions stored in the memory in advance.

In S6, it is checked whether machining for which automatic tool correction is to be performed has been completed, and if there is machining for which automatic tool correction is to be performed, steps S3 to S86 are repeated.

When the machining is completed in S6, the process advances to S7.

In this way, when the material and thickness of the plate material do not change, processing can be automatically proceeded by overriding the standard correction amount with the correction amount of the processing conditions under various processing conditions. Furthermore, if the material and thickness of the plate material are corrected in the same way as the processing conditions, only one standard correction amount is sufficient.

[Effects of the Invention] As can be understood from the above description, since the present invention has the configuration described in the claims, there is no need for field workers to change the NC program, tool correction amount setting screen, etc. This eliminates the need for intuition and experience as required in the past, and therefore, laser cutting can be performed quickly and with high precision.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an apparatus implementing the method of the present invention;
Figure 2 is a flowchart of the method for measuring the reference correction amount;
The figure is a flowchart when the Canadian program is executed.

Claims (1)

[Claims] The plate material to be processed into a product is cut in advance according to standard processing conditions, the beam diameter is determined from the width of the cutting groove, the standard correction amount is stored in memory based on this, and in the case of arbitrary processing conditions, the standard processing conditions are An automatic tool diameter correction method for a laser processing machine, characterized in that the beam diameter is automatically corrected in accordance with processing conditions by comparing the correction amount with the reference correction amount.