JPH0263694A - Assist gas supply device - Google Patents

Abstract

PURPOSE:To secure prescribed assist gas pressure and to execute cutting of a high quality by increasing pressure of dry air supplied from a dry air unit and supplying it. CONSTITUTION:Air which is supplied from a dry air unit is supplied from an IN side, and supplied to a first pressure increasing chamber 18 and a second pressure increasing chamber 16. On the other hand, air passes through a governor 21 and a changeover valve 20 and supplied to a first driving chamber 15, as well. Air which is supplied to a first driving chamber 15 and a first pressure increasing chamber 18 works on a piston 19 and brings air of a second pressure increasing chamber 16 to pressure increase. As a result, the piston 19 moves to the left and supplies increased pressure air to an OUT side from a check valve 14. When the piston 19 comes to the stroke end, the piston 19 switches the changeover valve 20, and a first driving chamber 15 and a second driving chamber 17 are switched to exhaust and supply, respectively. Subsequently, the piston 19 is inverted, air of the pressure increasing chamber 18 is brought to pressure increase by pressure of the pressure increasing chamber 16 and the driving chamber 17, and increased pressure air is exhausted from the check valve 14. By repeating the foregoing, air of high pressure is supplied continuously from the IN side to the OUT side.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application] The present invention relates to an assist gas supply device used in laser processing.

[Conventional technology]

In recent years, dry air has been increasingly used as an assist gas in laser processing machines because it can reduce running costs. In addition, in aluminum processing, O! Compared to using gas, using dry air provides a higher quality cut surface and amount of dross deposited, so its applications are expanding.

FIG. 4 is a configuration diagram of a conventional assist gas supply device.
In the figure, (1) is a compressor that supplies air;
(2) is a dry air unit that removes moisture from the air supplied from the compressor (1), (3) is a solenoid valve that switches the air supply from pigeon to air, (4) is a pressure gauge, and (5) is a processing head ( Piping that supplies dry air to 6), (7)
is a processing lens that focuses the laser beam, and the processing head (
6) It is stored inside. (8) is a nozzle that supplies dry air, which is an assist gas, onto the workpiece αQ.

Next, the operation will be explained. Compressor (1) C. In the case of a laser processing machine, an oil-free type is used to prevent oil from adhering to the lower surface of the processing lens (7). This is because if the laser beam is irradiated with oil attached to the lower surface of the processing lens (7), the laser beam will burn the oil and the life of the processing lens will be significantly shortened or it will be damaged.

Due to the structure of the compressor (1), the air supplied from the oil-free type compressor (1) has a pressure of about 81 or less for boat fishing. This air ha,
Next, it is supplied to a dry air unit (2) to remove moisture. Moisture in the air is removed by the compressor (1)
Similar to oil, it has a negative effect on the processed lens (7), so a dry air unit (2) is always required. The air supplied from the compressor (1) is applied to the workpiece (tooth) where the laser beam is focused by the processing lens (7).
The processing gas flow (9) is supplied to the top, but the pressure at this time is approximately 5 Wcd due to pressure loss in each device and piping loss.
It becomes.

For example, when cutting aluminum using dry air as an assist gas, the pressure of the dry air usually needs to be 7 to 8 degrees, and machining cannot be performed as it is. Therefore, in order to obtain a predetermined pressure, high-pressure compressed air may be used as an air supply source.

[Problem to be solved by the invention]

Since the conventional assist gas supply device is configured as described above, when dry air is used as the assist gas, a predetermined pressure necessary for processing may not be obtained.

For this reason, there were problems such as not being able to obtain good processing quality or making it impossible to cut. Further, in order to obtain a predetermined pressure, high-pressure compressed air may be used as an air supply source, but in this case, there is a drawback that running costs are extremely high.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an assist gas supply device that can obtain a predetermined assist gas pressure.

[Means to solve the problem]

The assist gas supply device according to the present invention includes a dry air unit that removes moisture from the air, a pressure intensifier that increases the pressure of the dry air sent out from the dry air unit, and a valve that controls the supply of the increased pressure dry air. It is prepared.

[For production]

In Jin's invention, a dry air unit removes moisture from the air to form dry air, and the pressure of this dry air is increased by a pressure intensifier and sent out.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, since the symbols (1) to αQ are the same as those of the conventional device, their explanation will be omitted.

(B) is a pressure intensifier, which is disposed between the dry air unit (2) and the processing head (6). , (2) is a tank, which is attached to the rear of the pressure intensifier (6). FIG. 2 is a sectional view showing the structure of the pressure intensifier (b), which will be described in detail below.

The air supplied from the dry air unit (2) is IN
It is supplied from the side to the first pressure intensification chamber (to) and the second pressure intensification chamber aG, which are connected by a check valve (2).

On the other hand, air is also supplied to the first drive chamber (to) via the governor (2) and the switching valve. Then, the air supplied to the first drive chamber (to) and the first pressure intensification chamber (to) acts on the piston (2) to increase the pressure of the air in the second pressure intensification chamber α6. Next, the piston α moves to the left in the figure to supply increased pressure air from the check valve α◆ to the OUT side. Then, when the piston Q reaches the stroke end, the piston α switches the switching valve. As a result, the first driving chamber (to) is switched to the exhaust state and the second driving chamber to the supply state. Then, the piston α is reversed, and the pressure of the second pressure intensification chamber (to) and the second drive chamber αη is used to increase the air pressure in the third pressure intensification chamber (to), and the pressure increase air is supplied from the check valve α4. Discharge.

By repeating the above steps, air with a higher pressure than the IN side is continuously supplied to the OUT side. Here, IN side pressure and OU
The relationship between T-side pressure is shown in FIG.

According to this pressure intensifier (b), as is clear from the figure, 2
It is possible to secure twice the pressure.

The pressure intensifier I described above is an air-driven pressure intensifying valve, and simply uses a piston operation to increase the pressure.

For this reason, a pulsating flow may be generated in the processing gas flow (9), which may cause cutting lines on the laser cut surface, so a tank (2) is installed downstream of the pressure intensifier σp. This prevents pulsating flow.

The size of this tank (b) differs depending on the company that consumes dry air for laser processing, but it is usually 201 or more.

〔Effect of the invention〕

As described above, according to the present invention, since the pressure of the dry air supplied from the dry air unit is increased and supplied, the available assist gas pressure can be secured.
It enables high-quality cutting and also has the effect of significantly reducing the amount of wetting.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram showing an assist gas supply device according to an embodiment of the present invention, Fig. 2 is a front sectional view of a pressure intensifier according to the invention, and Fig. 8 is a pressure characteristic diagram of the pressure intensifier according to the invention.
FIG. 4 is a configuration diagram showing a conventional assist gas supply device. In the figure, (1) is a compressor, (2) is a dry air unit, (8) is an electromagnetic piece, and 0υ is a pressure intensifier. In addition, in the figures, the same reference numerals indicate the same parts.

Claims (1)

[Claims] A dry air unit that removes moisture from air supplied from an air supply source and sends it out as dry air, a pressure intensifier that increases the pressure of the dry air sent out from the dry air unit and sends it out, and a dry air sent out from the pressure intensifier. An assist gas supply device consisting of a valve that controls the supply of gas.