JPS63248585A - Pulse laser machine - Google Patents

Abstract

PURPOSE:To output a double pulse and to effect intermittent piercing with high quality by providing 1st and 2nd pulse oscillators and opening and closing the switch of a laser output setter with the output of the respective oscillator as the product. CONSTITUTION:The 1st pulse oscillator 3 inputs the signals of a frequency setter 1 and duty setter 2 and outputs the pulse signal conforming to the set value thereof. The 2nd pulse oscillator 18 is connected to the output side of the 1st pulse oscillator 3, inputting the signals of a frequency setter 32 and duty setter 33 in the frequencies higher than the 1st pulse oscillator 3 for the period of pulse ON with the 1st pulse oscillator 3 effecting the pulse output and outputting the pulse signal conformed to the set value thereof. And, the outputs of the 1st and 2nd pulse oscillators take a product from an AND circuit 19 to open and close the switch 5 connected to a laser output setter 4 with the output 29 thereof. The pulse frequency and duty can be set under the optimum conditions for cutting a work 16 at the intermittent piercing pulse cutting time with the double pulse coming in for the period of the signal outputted from the 1st pulse oscillator 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to improvement of processing performance in laser cutting, particularly intermittent hole drilling.

[Conventional technology]

FIG. 8 is a block diagram showing a conventional pulsed laser machining device, in which a frequency setting device (1) and a duty setting switch (5) are fully opened and closed. As a result, the power supply (6) connected to the switch 9 (5) is connected to the electrode (8) of the laser oscillator (7).
A) and (8B) generate a discharge to cause laser oscillation between the total reflection mirror (9) and the partial transmission mirror αq, and the laser beam α
Output from the partially transparent mirror as η.

Here, FIG. 2(a) shows the intensity of continuous output laser light when the duty is 100%, and (to) shows the intensity of t<pV laser light.

Next, the S wave selection mirror 4 shown in FIG. 8 is a total reflection mirror (9
) and the partially transmitting mirror QG, and polarizes the laser beam αυ into linearly polarized light.

This linearly polarized laser beam (6) is polarized by a retarder 0 into a circularly polarized laser beam α4. The circularly polarized laser beam a4 is condensed by a lens Ql19, reaches a focal position (171), and cuts the workpiece αe.

[Problem that the invention seeks to solve]

Conventional pulsed laser machining equipment can only oscillate at a certain frequency as described above, so the hole part is machined with continuous output, which has a large thermal effect, and also affects the machining quality, such as dross adhering and poor cut surface roughness. There was a problem that the value was low.

This invention was made to solve the above problems, and when cutting the workpiece t and the intermittent drilling,
The objective is to obtain a pulsed laser processing device that can perform high-quality hole drilling with little thermal influence.

[Means for solving problems]

The pulse laser processing apparatus according to the present invention is configured to open and close the switch of the first setting device.

and a pulse signal matching the duty setting value is output.

[Embodiments of the invention]

When the signals of the frequency setter (1) and duty setter (2) are input, the resistor (R1), AR2), capacitor (C
) oscillates at the duty and frequency determined by

Then, when the input ■ becomes IH' as shown in Figure 4 ←),
As shown in Figure 4), the period of 'CAN' (21J and '
OFF #% QN # period (c) and ' OFF
It is determined by the period of ', and if 1ON'A period 621) is TI, and the period of '0 and 1 is T2, then each is expressed by the following formula.

Frequency F=1/(TI+T2) 1~10
100 to 1000 is mainly used
It oscillates at Hz and outputs Q.

Further, the duty opens and closes the switch (5) connected to the laser output setting device (4) when the cutting process of the workpiece (6) is at its highest output. Here, Fig. 2 (Q), ((
By inserting a double pulse during the period of the signal output in (3) into 1), the pulse frequency and duty can be set to the optimal machining conditions for cutting the workpiece a0 during intermittent drilling and 0η pulse cutting. It can be pulsed.

Triangular wave generator @ at the frequency determined by the constant signal (b)
A pulse signal is output by a comparator that compares the signal outputted by the duty setting signal with the duty setting signal.

Here, an example of the configuration of the triangular wave generator (2) is shown in FIG.

The output of the frequency setter (c) is input from the terminal (to) to the voltage-frequency converter (to), and the pulse output is input to the counter (to).
Converter @
Reset.

Figure 6 (Q) is used as the duty setting signal (c) from @ζ.
), it outputs a double pulse.

〔Effect of the invention〕

Since the configuration is configured to open and close the switch of the laser output setting device, it is possible to output double pulses, making it possible to perform intermittent drilling of the workpiece, and also to improve the quality of the intermittent drilling of the workpiece. It can be carried out. In addition, by setting the output pulses to be intermittent, the surface roughness of the cut surface is very good, a glossy cut surface can be obtained, and the finishing material after processing is good and high quality processing can be performed. There is an effect.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a pulse laser processing apparatus according to an embodiment of the present invention, FIG. 2 is a waveform diagram of the present invention and related figures, FIG. 7 is a block diagram of a triangular wave generator according to the present invention, and FIG. The reason is the configuration diagram showing the pulse laser processing equipment of the Congregation Song Dynasty, No. 9.
The figure is an explanatory diagram of laser processing operation. (5) is a laser output setting device, (5) is a switch, (old device is a second device, (to) is a comparator. In the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] By applying a high voltage from a power source between a pair of electrodes, a discharge is generated, and this discharge causes laser oscillation between the total reflection mirror and the partial transmission mirror, and a laser beam is output from the partial transmission mirror. A first pulse oscillator that outputs a pulse signal according to a set value of frequency and duty in a laser processing device that guides the laser light to a processing position and focuses the laser light with a lens to laser-process a workpiece. and a second pulse that outputs a higher frequency than this first pulse oscillator, and outputs a pulse signal according to the set values of the frequency and duty while the first pulse oscillator is outputting the pulse signal. A pulse generator comprising a transmitter, and outputting pulsed laser light by opening and closing a switch connected to a laser output setting device according to the product of the outputs of the first pulse transmitter and the second pulse transmitter. Laser processing equipment.