JPH033799A - Water jetting device equipped with pressure reduction device of high pressure water - Google Patents

Abstract

PURPOSE:To prevent the fatigue failure and sealing function reduction in a pressure rising process by providing an orifice maintaining the original pressure of a high pressure water in a pressure rising state fed from a pressure increasing unit and an ON/OFF value in a high pressure water feeding process and composing it so as to reduce to the required water pressure of a torch. CONSTITUTION:In the case of the cutting, etc., with the injection of a water jet 11 by the nozzle of a torch 10 being to reduce to a specific pressure the pressure of the high pressure water that the cutting, etc. for a work and the water jet 11 of a nozzle feed by the required conditions for the work and the water jet 11 of the nozzle, the pressure is reduced to the specific pressure by the combination of the contraction by the ON/OFF control of the ON/OFF valve 14 provided on the way of the pressure rising piping connected to a torch 10 from a pressure increasing unit 3 and a fixed orifice 13. Consequently the original pressure fed from the pressure increasing unit 3 of the base part side in a pressure rising circuit is maintained always constantly and the fatigue failure and sealing function reduction of a high pressure part are prevented.

Description

[Detailed Description of the Invention] <Industrial Application Field> The disclosed technology converts water such as tap water into predetermined high-pressure water and sprays it as a water jet from a small-diameter nozzle onto a predetermined workpiece to accurately cut it as designed. It belongs to the technical field of reducing the pressure of high-pressure water.

<Summary of the gist> The invention of this application raises the pressure of tap water etc. from a water supply unit such as a pump connected to a tap water source etc. to a predetermined high pressure state using a pressure increasing unit such as a hydraulic cylinder and supplies the accumulator etc. This invention relates to a water jet processing apparatus equipped with a high-pressure water pressure reducing device that reduces the pressure of water to a high-pressure water that is adapted to the usage condition of the water supply in the process of feeding the water under pressure to the torch of the nozzle unit through the high-pressure parts of the water jet. , while maintaining the original pressure of the boosted high-pressure water from the pressure booster unit that feeds the torch of the nozzle unit, the pressure is reduced to the torch's required water pressure in the process up to the torch using a combination of orifices and on-off valves, etc. This invention relates to a water jet processing device equipped with a high-pressure water decompression device.

<Prior art> As is well known, many industrial products have processed surfaces such as cutting or cutting surfaces, and therefore, in the manufacturing process of these industrial products, there are cases where cutting or machining of such surfaces is essential. There are many.

In many cases, processing of such a cut surface or cut surface uses physical means such as machining using a machine tool such as milling, gas cutting, plasma cutting, etc.
There is a risk that thermal changes may occur in the cut surface or the material in the vicinity of the cut surface by such means, resulting in deterioration of the quality of the product.

In addition, the fusing nozzle and the workpiece are tightly interlocked, which makes it difficult to clean the nozzle, and the nozzle may become clogged or worn.

In addition, for example, wire cutters and contour machines do not require preparation of holes prior to cutting, but the accuracy must be high, which makes the work extremely cumbersome.

In addition, these cutting means and cutting means have the disadvantage that the type of workpiece is limited and the degree of freedom in mounting the workpiece is limited.

In order to deal with this problem, recently, water such as tap water has been made into high-pressure water that has been pressurized from several to several hundred atmospheres to several thousand atmospheres, and the high-pressure water is injected from a small diameter nozzle. So-called water jets have come into use for cutting and cutting workpieces, and are safe and sanitary with a small amount of water, without wear or clogging, and allow for greater freedom in handling workpieces, reducing deterioration and odor. With the birth of new materials, it has become increasingly important due to the advantage that it does not produce water, and recently it has even become possible to create high-pressure water jets of up to 10,000 atmospheres.

It is even becoming possible to mix abrasive materials such as fine metal powder into the high-pressure water ejected from the nozzle to cut or cut highly hard metals, ores, and the like.

Therefore, when using the water jet, which has such many advantages, the usage conditions of the nozzle unit for the workpiece, that is, the pressure increase state of the high-pressure water at the required pressure, must be adjusted to ensure optimal cutting. Cutting capacity and the like are related to pressure, flow rate, and feed rate, and are appropriately selected depending on the target workpiece and cutting conditions.

The high-pressure water circuit of [Waterjet] ~ will be briefly explained with reference to FIG. 7. Tap water (not shown) is supplied from a tap water source (not shown) by a pump unit 2 to a hydraulic unit 5 attached thereto to have a smoothing function, and is connected to a hydraulic cylinder etc. The pressure is supplied to the pressure increasing units 3 through the check valves 4, 4, and each pressure increasing unit 3 is controlled by the hydraulic control mechanism 5 (not shown).
The pressure of the specified high-pressure water is increased by switching the
The water is fed under pressure from the accumulator 7 to a torch 10 of a nozzle unit installed opposite to a predetermined workpiece 9, and a water jet 11 is ejected from the nozzle of the torch 10 to cut the workpiece 9 into a predetermined shape.

<Problem to be Solved by the Invention> Therefore, the higher the pressure of the water jet 11 ejected from the torch 10, the more the cutting ability for the workpiece 9 increases proportionally. Air pressure is increasingly being designed to be higher, for example, from the conventional several thousand kilometers to around 10,000 atmospheres.

High-pressure parts such as the swivel joins 1 to 6, the accumulator 7, the on-off valve 8, and the high-pressure piping are always supplied with such high-pressure water, and as described above, the water jet 11 to the workpiece 9 High-pressure parts There were disadvantages such as fatigue failure in the system over time, resulting in leaks and reduced durability.

Of course, the high pressure control mechanism 5 of the pressure boosting units 3 and 3 also performs pressure control, but it is said that frequent drastic changes in pressure in the high pressure parts cannot prevent such fatigue failure and seal failure. There was a negative point.

In addition, when reducing the pressure to the required high pressure depending on the conditions of use of the nozzle 10, the pressure is accumulated in the accumulator 7, and when the water is released and the pressure is increased, waiting time and rise time are required to accumulate the pressure, which reduces drive efficiency. This had the disadvantage of lowering productivity and hindering productivity.

However, as mentioned above, when cutting the workpiece 9 via the water jets 1 to 11, it is necessary to supply high-pressure water at the optimal pressure J depending on the usage conditions. Furthermore, there was an unavoidable negative point in that it was necessary to frequently increase or decrease the pressure of high-pressure water by installing a pressure increase unit 3.3 or the like.

<Object of the Invention> The object of the invention of this application is to prevent fatigue failure of the high-pressure circuit and deterioration of the sealing function in the pressurization process of the high-pressure water used for cutting the work by jetting from the nozzle of the water jets 1 to 1 based on the above-mentioned prior art. It is possible to take this problem as a technical issue to be solved, to make effective use of the various advantages of cutting workpieces with a water jet without reducing any of them, and to make it possible to effectively utilize the various advantages of cutting workpieces with a water jet without reducing any of them. The high-pressure water required by the torch of the nozzle unit I can be produced as required while maintaining the high pressure, and it is also possible to prevent fatigue failure of high-pressure parts and deterioration of sealing function during the pressure increase process. In this way, it is an object of the present invention to provide a water jet processing device equipped with an excellent pressure reduction device for high-pressure water, which is useful for processing technology applications in various manufacturing industries.

<Means/effects for solving the problem> 1) In accordance with the IL purpose, the structure of the invention of this application, which is summarized in the above-mentioned claims, is to solve the above-mentioned problem by providing a pump etc. connected to a tap water source. The water supply unit feeds tap water to a pressure increase unit such as a hydraulic cylinder, and the pressure increase unit continuously and smoothly supplies predetermined high-pressure water to the torch of the nozzle unit by a hydraulic control mechanism etc. The high-pressure water at a predetermined high pressure is ejected from the torch to the workpiece as a water jet to cut the workpiece in a predetermined manner, and,
When the pressure of high-pressure water supplied by the torch nozzle needs to be reduced to a predetermined pressure due to the requirements for the workpiece or the nozzle's water jet, it is necessary to reduce the pressure of the high-pressure water to a specified pressure by cutting the water jet from the torch nozzle. The on-off valve is controlled on and off by a combination of the provided on-off valve and a variable orifice, or a fixed orifice, and the pressure is reduced to a predetermined pressure by the orifice.
The source pressure from the pressure booster unit on the base side of the pump is always maintained constant to prevent fatigue failure or deterioration of sealing function of high-pressure parts such as accumulators, swivel joints, on-off valves, and high-pressure piping. This was achieved by taking technical measures to

<Example> Next, an example of the invention of this application will be described below with reference to FIGS. 1 to 6.

Note that the same parts as in FIG. 6 will be explained using the same reference numerals.

In the embodiment shown in FIGS. 1 to 3, a water supply unit such as a pump connected to a tap water source is connected to the pressure booster unit 3, as in the conventional embodiment shown in FIG. The increased pressure passes through the high-pressure pipe 120, the accumulator 7, and the swivel joint 6, and then from a predetermined orifice 13 to the second on-off valve 1.
4' is connected to the torch 10 of the nozzle unit, and a water jet 11 of high pressure water is jetted from a nozzle 16 onto a workpiece (not shown).

In the invention of this application, a bypass high-pressure pipe 1 is connected from the end of the swivel joint 6 of the high-pressure pipe 12 to the fixed orifice 13 and the second on-off valve 14'.
2' are branched and connected, and a first on/off valve 14 is interposed in the middle.

Then, if the pressure of high-pressure water supplied from the pressure increase unit 3 to the torch 10 must be reduced to the pressure of the supplied high-pressure water depending on the cutting conditions for the torch 10 and the workpiece, a second As shown in the figure, by closing the first on-off valve 14, the high-pressure water passing through the swivel joints 1 to 6 passes through the fixed orifice 13 and passes through the second on-off valve 14'. + The water jet 111 is fed to the Heech 10 and is ejected from the nozzle 16 onto the workpiece.

Therefore, in this embodiment a'-3, the source pressure of the pressure increase unit 3 is maintained as it is, and the first on-off valve 1
4 and fixed orifice 13, the pressure is reduced to a predetermined value.

Then, in the second step, as shown in FIG. Piping 12 and bypass high pressure piping 12'
It is distributed to the workpiece as a water jet 11 from the nozzle 10 via the second on-off valve 14', and is then sprayed onto the workpiece as a water jet 11 through the first on-off valve 14 and the fixed orifice 1.
3, high-pressure water whose pressure has been reduced to the required pressure of the nozzle 10 is supplied to the accumulator 7 and the swivel joins 1 to 6 so that the original pressure of the pressure increase unit 3 is maintained.

Therefore, in this embodiment, the high pressure parts such as the accumulator 7 and the swivel joint 6 in the high pressure piping 12 from the pressure boosting units 1 to 3 are connected to the pressure boosting units 1 to 3. ~
The source pressure of the high-pressure state in step 3 is maintained, and high-pressure water at the high pressure required by the nozzle 10 is supplied, and the cutting that matches the design conditions is done optimally for the workpiece. .

Therefore, using multiple torches 10.10, or
When cutting workpieces under a plurality of conditions with one torch 10, for example, as shown in FIG.
12'... are branched and connected to each fixed orifice 13.
．． 13... and the first on-off valve 14゜14
(In this embodiment, three single-stage and multi-stage valves are installed), connected to the second on-off valve 14', and an electromagnetic on/off switching valve 15 is interposed in the middle of each valve to selectively switch off the workpiece. Supplying high pressure water reduced in pressure according to the cutting conditions of
The source pressure of the pressure increasing unit is maintained in the high pressure pipe 12 from the torch 1 as in the above embodiment.
Although the high-pressure water that has been depressurized according to the usage conditions of This prevents fatigue failure of the joints 1 to 6, etc. and the high pressure pipe 12, and leakage due to deterioration of sealing function. FIG. 6 shows another embodiment of multi-stage juxtaposition.

In the above two embodiments, by using the fixed orifice 13 as the orifice, the first on-off valve 14
In contrast, in the embodiment shown in FIG. 5, a variable orifice 13' is inserted as the orifice, and the orifice is adjusted in accordance with the opening and closing of the first on-off valve 14. The variable orifice 1
By controlling the 3' aperture from 1 to -,
Even if the required pressure of 10 changes, high-pressure water that is manually or automatically controlled can be supplied under optimal conditions.

It should be noted that the embodiments of the invention of this application are of course not limited to the above-mentioned embodiments. For example, the required high pressure conditions with the torch 10 for the first on-off valve combined with the fixed orifice can be determined using a dial gauge type. Various methods can be adopted, such as connecting with a fixed mechanism or, in the case of a variable orifice, connecting an automatic setting device to match the high pressure water required by the torch.

In addition, it goes without saying that the design can be changed freely, such as being applicable not only to pure water jets but also to abrasive jets in which abrasives and the like are mixed into high-pressure water.

<Effects of the Invention> As described above, according to the invention of this application, a hydraulic cylinder, etc. connected to a water supply unit for water flow, etc. is used in cutting or machining of a workpiece using a nozzle, abrasive jet, etc. that uses high-pressure water jetting. In the high-pressure water supply process, the torch is connected to the torch of the nozzle unit through high-pressure pipes extending from the pressure booster unit or high-pressure parts such as accumulators and swivel joints, and sprays high-pressure water onto the workpiece. High-pressure water that has been reduced to the high pressure required by the torch is supplied only in the vicinity of the torch, and the source pressure of the pressure booster unit is maintained in the high-pressure piping section beyond the pressure booster unit. Therefore, even if the usage conditions of the torch change, the pressure fluctuations in each of the high-pressure parts mentioned above will not change frequently over time, and therefore the high-pressure parts and high-pressure piping will not suffer from fatigue failure or seal failure. This has an excellent effect of preventing leakage caused by the leakage.

Furthermore, since there is no need to store or release high-pressure water in the accumulator, there is no need for start-up or waiting time required for pressure setting, resulting in improved operating efficiency and productivity.

Furthermore, when using multiple torches or a single torch for workpieces with multiple operating conditions, it is possible to set the pressure on the torch alone without changing the source pressure of the pressure intensifier unit, so there is no need to adjust the waiting time. This also brings about the effect of improving productivity.

Furthermore, since the durability is improved, the life of the plant and each unit is extended, and maintenance etc. are not required, leading to a reduction in running costs.

However, the advantages of cutting workpieces using water jets and abrasive jets can be utilized without any loss.

Since the original pressure of the pressure intensifier unit is maintained, the pressure intensifier unit can generate ultra-high pressure water such as several thousand kilograms of high pressure water or 10,000 atm, allowing it to cut continuous products with high hardness. It also has the effect of making it possible to process products using new materials and composite materials.

[Brief explanation of drawings]

1 to 5 are detailed explanatory diagrams of the invention of this application,
Figure 1 is a schematic circuit diagram of the main part of the principle aspect of the first embodiment;
．． Fig. 3 is a partial schematic diagram of the pressure reduction adjustment, Fig. 4 is a schematic diagram of the main part of another embodiment, Fig. 5.6 is a schematic diagram of the main part of another embodiment, and Fig. 7 is a diagram of the prior art. Based on Water Jets 1
It is a high-pressure water circuit diagram of the high-pressure water jet of ~. 2... Water supply unit 3... Pressure increase unit 10... Nozzle unit (torch) 11... Water Jets] ~ 7 13, 13'... Orifice 13... Fixed orifice 13'...・Variable orifice 14, 14'...on/off valve 8

Claims (3)

[Claims] (1) In a water jet processing apparatus equipped with a high-pressure water pressure reducing device that has a process of increasing the pressure of water from the water supply unit via a pressure increasing unit and sending it under pressure to the torch of the nozzle unit, the above A pressure reducing device for high pressure water, characterized in that an orifice and an on-off valve for maintaining the source pressure of high pressure water in a pressurized state from a pressure boosting unit are provided in the high pressure water supply process to reduce the pressure to the water pressure required by the torch. Water jet processing equipment equipped with (2) A water jet equipped with a high-pressure water reducing device according to claim 1, characterized in that a plurality of the reduced pressures are arranged in parallel to selectively feed the reduced-pressure high-pressure water to the torch. Processing equipment. (3) Claim 1, characterized in that the pressure reduction is performed by a combination of a variable orifice and an on-off valve.
A water jet processing device equipped with a high-pressure water depressurization device as described in 1. (4) A water jet processing apparatus equipped with a high-pressure water pressure reducing device according to claim 1, wherein the pressure reduction is performed by a combination of a fixed orifice and an on-off valve. (5) A water jet processing apparatus equipped with a high-pressure water decompression device according to claim 4, wherein a combination of the fixed orifice and the on-off valve is provided oppositely for each torch having a nozzle.