JPH07171799A - Pipe machining method and device therefor - Google Patents

Abstract

PURPOSE:To enable the positive and sharp machining of a pipe without the formation of burrs and the like by providing the inside of the pipe with a nozzle body for jetting jet outward from the inside in the case of cutting the pipe with water jet. CONSTITUTION:At the time of performing lateral cutting (17) to a metal pipe 1 of circular cross section, the pipe 1 is horizontally set on a catcher tank opened at the upper face, and both end parts of the pipe 1 are supported in the cantilever state by a supporting device and a clamper. While rotating the pipe 1 around an axis by a driver, high pressure water and polishing material fed through a high pressure water feed passage 13 and a polishing material feed passage 14 are jetted at ultra-high speed radially outward from a nozzle head to form abrasive water jet 3. With this water jet 3, the cutting of the pipe 1 is started from the inner surface side, and the whole periphery of the pipe 1 is cut transversely in association with the rotation of the pipe 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The disclosed technology belongs to the field of processing technology for cutting a metal round pipe or square pipe with a jet of high-pressure water.

[0002]

2. Description of the Related Art As is well known, pipes are used in various applications, whether they are round or square, and are used not only for fluid transportation but also for structural members such as construction and machinery. At times, it is also used as a means of transmitting information.

[0003] The unit length of such a pipe is standardly determined due to manufacturing conditions, transportation restrictions, etc., and in reality, the length of the pipe is set to a predetermined length at the time of assembly at the installation site. Processing such as cutting or cutting is performed.

In general, cutting and cutting with a burner, an arc, etc. are generally used for cutting and cutting in the field. However, since these means use considerable heat such as flame, There is a danger that there is a risk of fire, etc., and in some cases there is an explosion, etc. There is a disadvantage that it is not general, there is also a demerit that heat deterioration of the base material etc. There is also a demerit. There is a problem that the surface roughness is rough and burrs, burrs, etc. are generated, so that fine precision cannot be obtained well. Therefore, it is difficult for structures and the like to perform welding and joining in the subsequent stage. .

[0005]

In order to cope with this, recently, a high-pressure water is used to make a small-diameter jet at a super-high speed to a predetermined work, and the kinetic energy thereof is used for cutting, cutting and peeling. A so-called water jet for making holes is devised as shown in, for example, Japanese Utility Model Laid-Open No. 63-50700, and various improvements have been made and put into practical use. Not only those made of wood and wood, but recently, so-called abrasive water jets in which fine-grained abrasives such as garnet sand are mixed in high-pressure water have also been put into practical use, and the above is also applicable to metal works. Processing such as cutting, cutting, peeling, and drilling is possible, and it is becoming possible to process workpieces with complicated shapes.

However, in a water jet including such an abrasive water jet, since the jet ejected from the nozzle has an ultrahigh speed and high energy, the jet after the working action on the work is performed. Since energy may affect other supporting devices and instruments, there is a usage mode in which the nozzle is normally exposed to a shock absorbing catcher tank and a work is interposed therebetween.

When a water jet is used for cutting or cutting the above-mentioned pipe, if the jet is jetted from the outside of the pipe by interposing the pipe between the nozzle and the catcher tank, the jetted high pressure The jet of water penetrates the thick part of the pipe and reaches the thick part on the opposite side, and the jet also expands slightly, so processing such as cutting outside the design is also performed on the thick part after penetration. The inconvenience of giving it occurs.

In addition, in the conventional general type of abrasive water jet, the high pressure water nozzle and the jet nozzle in front of and behind the mixing chamber of the nozzle head are concentrically arranged on a straight line, which is considerably large. The size of the pipe is small, and therefore, there is a negative point that the jet cannot be jetted from the inside to the outside of the pipe due to the competition.

[0009]

OBJECT OF THE INVENTION The object of the invention of this application is to solve the problems of processing such as cutting with a water jet of round or square pipes based on the above-mentioned prior art,
While making full use of the inherent advantages of water jet, ensure that the pipe with an inner diameter that is as small as possible is set as designed without forming burrs or burrs.
Moreover, it is intended to provide an excellent pipe processing method and device, which are capable of being sharply processed, and which are useful in the field of application of processing technology in the metal product manufacturing industry.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the structure of the invention of this application, which has the above-mentioned claims as its gist according to the above-mentioned object, has a rectangular cross section or
When cutting or cutting a circular pipe with a water jet, the pipe is laid horizontally on a catcher tank facing the nozzle head and supported by a predetermined supporting device. The nozzle head is inserted and supported in a cantilever manner from the end of the mixing chamber, and the nozzle is placed in a posture in which it is directed from the inside to the outside at the processing site, and high pressure water of a predetermined pressure is sent to the mixing chamber of the nozzle head. In addition to supplying, abrasives such as garnet sand are sucked and fed by negative pressure in the mixing chamber, agitated and mixed, and jetted at ultra-high speed from the nozzle, directing the thick part of the pipe from the inside to the outside. The jet that processed the pipe by cutting and cutting by cutting and cutting it in the specified energy in the catcher tank Absorbed, burrs and burrs do not occur in the processed part on the outside of the processed pipe, revealing an accurate and smooth processing state and facilitating welding etc. in the subsequent stage, and thus water When processing with a jet, rotate the pipe outside the nozzle head in a predetermined manner so that the nozzle head is always directed toward the downward catcher tank side, or to rotate the nozzle head in reverse, use a swivel joint or the like. The technical means was adopted so that the abrasive material was fed to the high-pressure water, and the pipe having a considerably small inner diameter could be cut or cut as designed.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following will describe one embodiment of the invention of this application with reference to the drawings.

The illustrated embodiment is a mode in which a round metal pipe 1 is transversely cut at a set length by an abrasive water jet processing device 2. In this embodiment, the processing device 2 is fixed. The pipe 1 is made to rotate and the pipe 1 is processed while rotating. As shown in FIG. 1, the processing device 2 is placed in the pipe 1 (the installation direction of the processing device 2 is the pipe 1).
(Not necessarily in the direction of the axial center), and the jet energy is set so that the jet 3 cuts the thick portion of the pipe 1 as much as possible.

Thus, as shown in FIG. 4, the nozzle head 9 of the processing device 2 for the abrasive water jet set in the pipe 1 faces downward as in the case of cutting by the ordinary abrasive water jet. The pool type catcher tank 4 filled with a predetermined energy absorbing material such as a metal ball is provided with a predetermined supporting device 5 for the pipe 1, and one end portion of the pipe 1 is provided. A clamper 7 having a cantilever type support on one side and a drive device 6 such as a motor with a predetermined speed reducer on the other side.
Is adapted to be able to apply a predetermined rotation by clamping the pipe 1 with an appropriate reaction force.

Further, on the side of the supporting device 5 of the pipe 1, a supplying and supporting device 8 for supplying abrasive material such as high pressure water and garnet sand to the processing device 2 for the abrasive water jet.
Are connected to support the processing device 2 in the pipe 1 in a cantilever manner, and the nozzle head 9 thereof is extended and supported by a predetermined length.

As shown in FIG. 3, the nozzle head 9 includes a shank 10 of the nozzle 1, a head block 11 screwed to the shank 10, and the head block 11.
A high pressure water supply passage 13 communicating with the supply device 8 in the shank 10.
And a feed passage 14 for a predetermined powdery abrasive such as garnet sand are provided in a substantially parallel state and connected to the head block 11.

A water nozzle 16 for forming a high-pressure water jet, a mixing chamber 15 for mixing an abrasive, and a nozzle body 1 are provided in the head block 11.
2nd class is decorated.

In the ordinary abrasive water jet processing apparatus 2, the passage of high pressure water is provided substantially parallel to the jetting direction of the jet 3.
The feature of the invention of this application is that the directions are substantially orthogonal to each other (they may be set at 45 ° and 60 ° for welding groove processing, etc.).

Since the passage of the high-pressure water is curved and faces the water nozzle, a flow path may be rectified by inserting a filter or a grid in this portion.

Therefore, in the processing apparatus of the invention of this application, firstly, the flight distance of the jet 3 ejected from the nozzle body 12 is different from that of an abrasive water jet or the like used for ordinary cutting, etc. The kinetic energy is small because the distance is so short that the thick portion is cut from the inside to the outside, and secondly, the abrasion resistant treatment layer 16 is interposed. Thirdly, the durability is extremely good because the abrasive material feeding passage 14 faces the mixing chamber 15 from the tangential direction.

In the processing apparatus 2 having the above-described structure, as shown in FIG. 4, when the pipe 1 having a predetermined circular cross section is cut laterally 17, the pipe 1 is placed on the catcher tank 4 as described above. At this time, it is set sideways, supported by a supporting device 5 and a clamper 7 in a cantilever manner, rotated by a drive device 6 in a predetermined manner, and high pressure water and an abrasive material are fed to the nozzle head 9.

Incidentally, in the initial rising state, the abrasive material is fed by a predetermined amount by air transportation as in the conventional method,
After rising, the abrasive is supplied through the negative pressure suction force of the jet of high pressure water.

Then, the motor 6 is started and the clamper 7
When the pipe 1 is rotated at a predetermined speed via the
The abrasive water jet 3 is ejected from the nozzle body 12 at a predetermined ultra high speed and collides with the inner surface of the pipe 1, and the kinetic energy thereof starts a predetermined cutting,
The cutting portion is rotated by the rotation of the pipe 1 by the motor 6 and the cutting depth is gradually increased with each cycle, and finally, the skin is overlapped and the transverse cutting is performed.

Even if the jet 3 jetted out penetrates the cut surface, the nozzle head 9 is still in the lower catcher tank 4
Jet 3 that penetrated because of its fixed attitude to
Is absorbed by the impact absorbing material of the catcher tank 4.

In this way, the cutting process of the pipe 1 is completed.

Then, for the pipe after the cutting process, a new set is replaced or the pipe after the cutting is restarted for a predetermined cutting in other parts through axial movement.

Needless to say, the embodiment of the invention of this application is not limited to the above-mentioned embodiment, and the above-mentioned embodiment is a processing mode of transverse cutting of the pipe 1 at right angles to the axial direction, but it is along the axial direction. It goes without saying that cutting and cutting can be performed.

In the above embodiment, the nozzle head of the processing apparatus is rotated so that the nozzle head faces the catcher tank and the pipe side is rotated. On the contrary, the nozzle head of the processing apparatus is fixed by fixing the pipe side. May be rotated, but in such an embodiment it may be slightly mechanically complicated because a swivel joint or the like for the shank is used.

It goes without saying that the object of application is not limited to round pipes, but can be applied to square pipes.

Since the pipe which has been subjected to the predetermined cutting and cutting in this manner uses an abrasive water jet, the cutting surface is smooth and burrs, burrs and the like are produced as compared with the general mechanical processing. Does not occur, and the workability is extremely improved for welding, assembly, etc. in the subsequent stage.

It goes without saying that the pipe can be effectively applied not only to a metal pipe, but also to a ceramic pipe, a synthetic resin pipe, a glass pipe, a wooden pipe, or a paper pipe. is there.

For pipes made of these materials such as paper, wood, and synthetic resin, not only the abrasive water jet but also cutting such as ordinary water jet can be adopted. is there.

[0032]

As described above, according to the invention of this application, when performing a process such as transverse cutting or cutting on a synthetic resin or metal round pipe or a square pipe by a water jet, the inner diameter of a set size or more Compared with the mode in which the nozzle head faces the inside of the pipe in a cantilever manner and jets the jet from the inside to the outside by ejecting the jet from the outside, it penetrates the thick part closer to one side. The jet does not collide with the thick part on the opposite side, and the processed part such as the cut surface is not disturbed, and not only can it be processed smoothly as designed, burrs, burrs etc. on the outer surface of the pipe Therefore, it is possible to easily perform the welding, assembling and the like in the subsequent stage, and the precision of the final product can be kept excellent as designed, which is an excellent effect.

Further, since the jet of jetting jet is carried out from the inside to the outside, not only the machining portion can be machined, but also the energy of the jetted jet does not become excessive, and the catcher does not become excessive. There is an advantage that it can be immediately absorbed in a tank or the like, which leads to suppression of scattering and noise generation in the surroundings.

[Brief description of drawings]

FIG. 1 is a schematic partial cross-sectional vertical side view of an embodiment of the invention of this application.

FIG. 2 is a partial cross-sectional view of FIG.

FIG. 3 is a cross-sectional view of a processing device.

FIG. 4 is an overall schematic partial sectional side view of a processed state of a pipe.

[Explanation of symbols]

 1 Pipe 3 Water Jet 17 Cut Surface 4 Catcher Tank 6 Rotating Device 12 Nozzle Main Body 16 Water Nozzle 2 Processing Device 5 Pipe Supporting Device 8 Water Jet Nozzle Head Supporting Device

Claims (7)

[Claims] 1. A method for cutting and cutting a pipe with a water jet, wherein high pressure water is fed into the pipe along the axial direction, and a jet is jetted from the inside to the outside at a processing portion. A method for processing a pipe, which is characterized in that 2. The method of processing a pipe according to claim 1, wherein the water jet is an abrasive water jet. 3. The method of processing a pipe according to claim 1, wherein the water jet is performed by fixing the jetting direction toward the lower catcher tank. 4. The method for processing a pipe according to claim 3, wherein the pipe is rotated. 5. A pipe processing device in which a pipe is provided laterally between a catcher tank and a water jet nozzle facing the catcher tank, and a pipe supporting device is provided side by side with the catcher tank. A processing device for a pipe, characterized in that a support device for the water jet nozzle head facing the above is attached. 6. A pipe processing apparatus in which a pipe is provided laterally between a catcher tank and a water jet nozzle facing the catcher tank, and a support device for the pipe is provided side by side with the catcher tank. A processing device for a pipe, characterized in that a supporting device for the water jet nozzle head facing the above is attached, and further a rotating device is attached to the pipe. 7. The pipe processing apparatus according to claim 5, wherein the water jet nozzle head is an abrasive water jet nozzle head.