JPH02299787A - Laser beam machine - Google Patents

Abstract

PURPOSE:To automatically and accurately carry out follow-up at high speed by calculating the deviation based on a reference signal from a reference dimension setting means and a detection signal from a machining dimension detection means by a deviation calculation means and controlling a driving means based on a deviation signal from deviation calculation means. CONSTITUTION:Width dimensions of an iron plate 2 slit-cut are detected by a vision sensor 5 and this detected value is compared with a preset reference value. The deviation is calculated and it is discriminated whether or not the deviation is within a tolerance and when it is expected to deviate from the allowance, a motor 4 to move a laser beam machining head 3 is controlled based on the deviation and the laser beam machining head 3 is corrected and moved as the quantity of correction by the deviation amount. By this method, the quality of a product can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a laser processing apparatus for processing a steel plate or the like into a predetermined shape using a laser beam.

(Prior Art) One of the techniques for cutting iron plates is a cutting technique called slit cutting. This slit cutting involves cutting a thin rolled iron plate into a predetermined width by mounting a coiled hoop material rolled once on an uncoiler, feeding out the hoop material, and cutting the hoop material into a predetermined width. The hoop material is cut by rotating a rotary cutter.

However, in the above-mentioned cutting method, since shearing is performed using a cutter tool, burrs called "burrs" occur on the cut surface of the hoop material due to wear and damage of the cutter tool. These "bori" pose a quality problem, and the removal of these "bori" has become one of the challenges in cutting technology, as higher quality products are desired.

One possible method for solving this problem is to use a laser beam instead of a cutting tool. That is, the hoop material is cut by thermal energy in a non-contact manner using a laser beam with high energy density. Cutting with this laser beam is non-contact cutting, so there is no occurrence of "burrs" and cutting can be performed at high speed.

(Problems to be Solved by the Invention) In the above-mentioned slit cutting using a laser beam, the width dimensional accuracy of the hoop material cut into slits having a constant width has a great influence on the product quality in the slit cutting.

However, this width adjustment was done by focusing a laser beam emitted from a laser oscillator and adjusting the laser processing head that irradiates the hoop material to the cutting width, so if the width changes, the cutting line The machine had to be stopped and the laser processing head had to be moved manually.

Therefore, this resulted in a decrease in line operation rate and hindered productivity improvement.

Therefore, an object of the present invention is to provide a laser processing apparatus that can automatically follow changes in processing dimensions during laser processing at high speed and accurately.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention comprises a drive means for moving a laser processing head, a reference dimension setting means for setting the processing dimensions of a workpiece. , a machining dimension detection means for detecting the machining dimension of the workpiece after machining, and a deviation for calculating the deviation based on the reference signal from the reference dimension setting means and the detection signal from the machining dimension detection means. A laser processing apparatus is provided that includes a calculation means and a drive control means for controlling the drive means based on a deviation signal from the deviation calculation means.

(Function) The laser processing device configured in this manner detects the dimensions of the workpiece after processing, compares the detected dimensions with an arbitrarily set reference dimension, and calculates the deviation.
A driving means for driving the laser processing head is controlled based on the calculated deviation, and the laser processing head is moved by the deviation amount.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

In this embodiment, slit cutting using a laser beam, which is a type of laser processing, will be explained so as to correspond to the conventional technology.

As shown in FIG. 1, this embodiment houses a condensing lens 1 that condenses laser light emitted from a laser oscillator (not shown), and uses the condensed laser beam B to collect the workpiece. A laser processing head 3 that cuts a steel plate 2, a motor 4 that moves this laser processing head 3 via a feed screw F, and a width dimension of the steel plate 2 cut into slits by a laser beam B from the laser processing head 3 is detected. a signal conversion circuit 6 that converts the video signal from the vision sensor 5 into a signal corresponding to the width dimension, a base width dimension setting circuit 7 that sets the width dimension to be processed, and the product. The output signal from the signal conversion circuit 6 is compared with the setting signal from the semi-width dimension setting circuit 7, and the deviation is calculated. A deviation calculation circuit 9 outputs a corresponding deviation signal, and the deviation signal output from the deviation calculation circuit 9 is compared with the setting range signal from the allowable deviation range setter 8, and the deviation signal is added to the setting range signal by a predetermined amount. a discrimination circuit 10 that uses the deviation signal as a correction amount for the laser processing head 3 if the deviation signal approaches the laser processing head 3; and a motor control circuit 11 that controls the motor 4 that moves the laser processing head 3 based on the output signal from the discrimination circuit 10. Furthermore, the signal conversion circuit 6. Reference width dimension setting circuit 7. Allowable deviation range setter 8. The deviation calculation circuit 9 and the discrimination circuit 10 are housed in the vision controller 12.

According to this embodiment configured in this way, the width dimension of the slit-cut iron plate 2 is detected by the vision sensor 5, and the detected value is compared with a preset Jul value to calculate the deviation. , determines whether the deviation is within the allowable range, and if it is likely to deviate from the allowable range, based on the deviation, the motor 4 that moves the rad 3 to laser processing is set to ff1l.
1, and the laser processing head 3 is moved for correction by the deviation as a correction amount.

In this example, the cutting deviation range was set using the allowable deviation range setter 8 to provide a margin for the machining width dimension. However, in the case of highly accurate control based on the machining width dimension, The motor 4 for moving the laser processing head 3 is operated without using the setting device 8, using the deviation between the output signal from the signal conversion circuit 6 and the setting signal from the reference width dimension setting circuit 7 as a compensation amount for the laser processing head 3. It may also be output to the motor control circuit 11 for control. Also, depending on the processing width dimension, slits may be cut into multiple (three or more) pieces, but even in this case, the number of slits corresponds to the number of slits cut into 1 piece. (2 locations)), set the width dimension cut by each laser processing head, compare it with the corresponding detected value (width dimension after processing), and calculate the deviation. However, it goes without saying that the present invention can be applied by controlling the motors that move each laser processing head according to the deviation. Furthermore, the present invention is applicable to the workpiece not only made of iron plates but also non-ferrous metals and non-metallic materials.

[Effects of the Invention] As described above, according to the present invention, the processed dimensions after processing are compared with the reference dimensions set larger, and the deviation is calculated.
Since the laser processing head can be moved to cancel out the deviation as necessary, it is possible to automatically follow changes in processing dimensions during laser processing at high speed and accurately, improving product quality. can be achieved.

[Brief explanation of the drawing]

FIGS. 1 and 2 show an embodiment of the present invention! E
The essential configuration diagram is a graph showing a discrimination method in the discrimination circuit shown in FIG. 2... Iron plate, 3... Laser processing head. 4...Motor, 5...Vision sensor. 6...Signal conversion circuit. 7... Reference width dimension setting circuit 1 9... Deviation calculation circuit, 10... Discrimination circuit. 11...Motor control circuit diagram 1

Claims (1)

[Scope of Claims] In a laser processing device that processes a workpiece into a predetermined shape by focusing a laser beam emitted from a laser oscillator by a laser processing head and irradiating it onto a workpiece, a drive for moving the laser processing head. means, a reference dimension setting means for setting a machining dimension of the workpiece, a machining dimension detection means for detecting a machining dimension of the workpiece after machining, a reference signal from the reference dimension setting means, and a reference signal from the reference dimension setting means; It is characterized by comprising a deviation calculation means for calculating the deviation based on a detection signal from the processing dimension detection means, and a drive control means for controlling the drive means based on the deviation signal from the deviation calculation means. Laser processing equipment.