JPS6057952B2 - Laser processing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved laser processing apparatus.

Conventionally, there has been one shown in FIG. 1 as an example of this type of device.

In the figure, 1 is a laser beam generating device, that is, a laser oscillator, and 2 is a laser beam generated by the laser oscillator 1. The direction of the laser beam 2 is changed by a reflector 3, and the beam is focused by a lens 4 to strike a workpiece 5. Performs processing such as cutting and welding.

Further, the workpiece 5 is placed on the table 7, and the motor 6
By moving the table 7, linear machining and the like are performed. 8 is an amplifier circuit for driving the motor 6; 9
is a ramp circuit that suppresses table acceleration.

Next, the operation of this conventional device will be explained.

When performing laser processing, first, the table 7 starts moving in response to a movement start signal, and at the same time, the laser beam 2 is output from the laser oscillator 1. Here, the moving speed of the table 7 needs to be gradually raised and lowered as shown in FIG. 2, depending on the weight and strength of the table 7, the magnitude of the torque of the motor 6, etc. The lamp circuit 9 generates this signal.
On the other hand, a constant laser beam is output as shown in FIG. 2a. Generally, for example in laser cutting,
When the machining speed is slow, the machining area is heated, so the cutting area tends to become wider.

That is, in the conventional laser processing apparatus, the heat input becomes relatively large during acceleration and deceleration such as starting and stopping the movement of the table 7, and as shown in FIG. 3, when performing laser cutting, The cutting width 10 becomes wider,
It also had drawbacks such as partial melting. This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and provides a device that can increase the precision of laser processing by controlling the output of laser light as a function of processing speed during processing. is intended to provide.

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

In FIG. 4, 11 is a speed detector, and the laser beam 2
This is a tacho generator installed coaxially with the table driving motor 6 in order to detect the relative moving speed (processing speed) of the workpiece 5 and the workpiece 5.

12 is a control device that compares the actual moving speed of the workpiece 5 detected by the tacho generator 11 with the moving speed setting signal of the table 7, and controls the control device while the actual moving speed is lower than the setting signal. , the laser output is controlled to be lower than the laser output setting signal according to the amount of the difference.

Next, the operation will be explained.

First, when the table starts moving at the signal to start moving, the fifth
As shown in Figure b, the tacho generator 11 outputs an output proportional to the moving speed. Along with this, the control device 12
Then, the output of the tacho generator 11 is compared with a preset moving speed, and while the detected moving speed is lower than the set signal, the laser output is made lower than the laser output set value. Also, conversely, whether the detection speed is equal to the setting signal or not,
Or when it is large, it is controlled to output the set laser output. In other words, the laser exit is as shown in Figure 5a.
It will be controlled as shown in. When performing laser processing with such a configuration, the output of the laser beam is controlled to decrease as the actual movement speed decreases, so even when the movement speed slows down during acceleration and deceleration of table movement, the workpiece can be 5 is not heated excessively, and the laser processing width can be made constant.

That is, the cutting width 10 shown in FIG. 3 makes it possible to always cut the workpiece 5 to a constant processing width, like the cutting width 10 shown in FIG. 6. In addition, although cutting was shown in the above embodiment, any laser processing such as welding, hardening, scriping, etc. may be used.

Furthermore, the laser output when the table movement speed is zero does not necessarily have to be zero depending on the object to be processed. Further, although Table 7 has been explained with reference to an example of one-dimensional movement, the same effect can be obtained even in the case of two-dimensional, three-dimensional, or more dimensional movement by controlling based on the synthesized velocity vector amount.

Furthermore, in the case of simultaneous movement in two or more dimensions, exactly the same "effect" can be obtained in the case of acceleration/deceleration at a corner portion of machining.

Further, the moving speed may be detected by any device other than the tacho generator as long as it can detect the moving speed of the table. As described above, according to the present invention, since the laser output is controlled according to the processing speed, the laser processing width can be kept constant, which has the effect of greatly improving processing accuracy, finish, etc.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a conventional laser processing device, Fig. 2 is a diagram showing the relationship between laser output and moving speed of the conventional device, and Fig. 3 is a plan view of an example of a workpiece processed by the conventional device. , FIG. 4 is a block diagram of an embodiment of the laser processing device according to the present invention, FIG. 5 is a diagram showing the relationship between the laser output and the moving speed of the device according to the present invention, and FIG. FIG. 2 is a plan view of an example of a workpiece. 1... Loser oscillator, 2... Loser light, 3
...Reflector, 4...Luns, 5...Workpiece, 6...Motor, 7...Table, 8
...Amplifier circuit, 9...Lamp circuit, 10
...... Cutting width, 11... Speed detection device,
12...Control device.

Claims (1)

[Claims] 1 A laser beam generator that outputs a laser beam based on a laser output setting signal, a moving device that moves a workpiece relative to the laser beam based on a moving speed setting signal, and a relative position of the laser beam and the workpiece. a relative speed detector that detects relative speed based on a signal; and a control that controls laser light output in proportion to the relative signal speed while the relative speed signal detected by the relative speed detector is lower than the moving speed setting signal. A laser processing device characterized by being equipped with a device.