KR20110139368A - Apparatus for expending pipe with mandrel - Google Patents

Abstract

PURPOSE: A device for expanding pipe equipping mandrel is provided to reduce manufacturing costs by securing quality stability and productivity increasing. CONSTITUTION: A device for expanding pipe equipping mandrel comprises a base member(100), a transfer member(200), a press member(300), a heater member(400), a placing member(350), a fixing member(500) and a mandrel member(600). A rail installs to the upper of the base member to transfer a steel pipe. The mobile tool is formed in back side of the base member. The mobile tool includes a cylinder rod in which the length is varied. The steel pipe is passed through the cylinder rod. The press member comprises a press plate and a touch panel. The touch panel is touched with the back side of the steel pipe while closing a fixed part of the mobile hole. The heater member is located in the base member anterior. The placing member is located in the heater member anterior. The fixing member is formed in the base member.

Description

Apparatus for Expending Pipe With Mandrel}

The present invention relates to a steel pipe expansion apparatus having a mandrel, in order to expand the steel pipe, first preheating the steel pipe at a high frequency, extrapolating the preheated steel pipe to the mandrel and pressurizing the steel pipe by a press to have a mandrel to expand the steel pipe. It relates to a steel pipe expansion device.

Steel pipes (PIPE) have various uses and detailed specifications, which make them convenient to use, and their demand is increasing with the development of the industry.They are easy to process, low in price, good workability and high strength, There are many economic advantages, such as durability and corrosion resistance, which can be improved through secondary processing.

Generally, the method of manufacturing steel pipes can be divided into seamless steel pipes (unbounded steel pipes, SEAMLESS STEEL PIPE) and jointed steel pipes (WELDED PIPE) with seams. The welded steel pipe is composed of electric resistance welded steel pipe, gas welded steel pipe and arc welded steel pipe, and arc welded steel pipe is composed of UOE press steel pipe, spiral steel pipe, roll bending steel pipe and continuous formed steel pipe.

Metalless steel pipe refers to a steel pipe made of a predetermined outer diameter and thickness by heating a billet, etc. by drilling a hole in the center with a perforator and making it into a hollow material, and then rolling it or drawing it with a drawing machine. And a press method for extruding the already punched material by a press.

The single welded steel pipe is manufactured by heating the SKELP roughly or cut to a predetermined width to a high temperature of about 1400 ° C., and then molding the tube into a tubular shape in a continuous single fold and simultaneously compressing it with a roll.

Welded steel pipe is manufactured by forming a rough steel or skelp into a tubing roll at room temperature and then welding the welded joint. ELECTRIC RESISTANCE WELDED (ERW), gas welded steel pipe, arc welded steel pipe (SUBMERGED ARC) WELDED, SAW), etc. UOE press steel pipe is formed by bending U-shape in U-shape after bending its entire length at room temperature. Roll bending steel pipe is formed by welding wide joint steel into curved surface using 3 ~ 4 rolls and welded joint. Spiral steel pipe welds joint while spirally winding wide steel.

Scaffolding steel pipes are indispensable for special pipes such as high pressure, high temperature, low temperature, and corrosion resistance, which cannot be used as welded steel pipes, and for structural structures and heat exchangers. Various industrial machinery, chemical plants, nuclear power, aircraft, automobiles, shipbuilding, refrigerated condensers Its field of use is very wide, such as boilers, and precision scaffolding steel pipes are used for instrumentation pipes, pneumatic cylinders, semiconductor equipment piping, measuring instruments and ship piping.

Most non-wood steel pipes produced at present are small and medium sized, and large diameter steel pipes of 18 inches or more are used in welded steel pipes, and there are limitations in field applications. In addition, huge facility investment is required to produce large diameter woodless steel pipe, and the existing production method has technical limitations.

The present invention has been made in order to solve the above problems, while maintaining a stable quality to expand the diameter of the steel pipe to a large diameter of 18 inches or more, with a mandrel to minimize the cost of expanding the steel pipe and maximize productivity To provide a steel pipe expansion device.

According to an aspect of the present invention, there is provided a steel pipe expansion device, comprising: a base member having a rail mounted on an upper side thereof to transfer steel pipes; A moving unit formed at a rear side of the base member, the cylinder rod having a variable length, and a steel pipe passing through the base member; A press member formed of a press plate on which the moving means is interlocked with the cylinder rod and formed with a moving hole through which the steel pipe passes, and a contact plate closing a predetermined portion of the moving hole and contacting the rear side of the steel pipe; A heater member positioned at the front side of the base member and configured to have a circular tube shape to radiate high frequency; A mounting member located at the front side of the heater member; A fixing member formed on the base member, the fixing member being installed to the rear of the moving unit and having a grip portion capable of moving; One side is fixed to the fixing member, the other side is mounted to the mounting member, it is formed to be inclined from one side to the other side and the diameter of the other side is composed of a mandrel member larger than the inner diameter of the steel pipe, the steel pipe is transported along the rail to move The grip member passes through the press member and contacts the press member, and the grip part is moved upward when the steel pipe passes such that one side of the mandrel is inserted.

And, the mandrel member is formed in a cylindrical shape is connected to the inlet and the end of the inlet is fixed to the fixing member, the inclined portion formed to be inclined to the other side and the end of the inclined portion is made of an image holding portion, than the diameter of the inlet The diameter of the holding portion is large, the diameter of the holding portion is characterized in that larger than the inner diameter of the pie portion.

And, the holding portion is characterized in that consisting of a shape holding portion for maintaining the shape in which the steel pipe is expanded, and an extension holding portion extending connected to the shape holding portion rear side.

The moving means may include a moving pipe passing through a steel pipe, a cylinder housing mounted on the moving plate, and a cylinder rod having a variable length in the cylinder housing, wherein the moving means is continuously formed in plurality. It is done.

And, the press member is made of a contact plate interlocked with the cylinder rod and formed with a moving hole so that the steel pipe passes, and the pair of one side is moved up, the other side is moved downward to close the portion of the moving hole, When the contact plate is closed to close a part of the moving hole, the steel pipe is not moved, and the introduction part is passed.

And, the fixing member is characterized in that it consists of a guide portion formed in pairs on the rear of the moving means, and the grip portion to move along the guide portion in the '' 'shape.

And, the grip portion is characterized in that the engaging groove is formed on both sides of the inner circumference.

In addition, the introduction portion is formed with a locking hole at the end, characterized in that it further comprises a locking hole corresponding to the width of the locking groove and inserted into the locking hole to protrude to both sides.

As described above, by expanding the non-wood steel pipe to large diameter, preemptive quality stability, productivity improvement, technology, etc. to reduce the production cost by 50% and secure price competitiveness to achieve cost reduction.

In addition, it is possible to stably supply large-diameter cascading steel pipes used in special sites such as nuclear power plants, and the delivery time of steel pipes can be greatly reduced.

1 is a perspective view showing a steel pipe expansion device having a mandrel according to the present invention.
2 is another perspective view showing a steel pipe expansion device having a mandrel according to the present invention.
3 is a side view showing a steel pipe expansion device having a mandrel according to the present invention.
4 is a perspective view showing a press member according to the present invention.
5 is a perspective view showing a heater member according to the present invention.
6 is a perspective view showing a fixing member according to the present invention.
7 is a sectional view showing a grip portion according to the present invention.
8 is a sectional view showing a mandrel member according to the present invention.

Hereinafter, a steel pipe expansion device having a mandrel will be described with reference to the accompanying drawings.

1 is a perspective view showing a steel pipe expansion device with a mandrel according to the invention, Figure 2 is another perspective view showing a steel pipe expansion device with a mandrel according to the invention, Figure 3 is a mandrel according to the invention 4 is a perspective view showing a press member according to the present invention, FIG. 5 is a perspective view showing a heater member according to the present invention, and FIG. 6 is a fixing member according to the present invention. 7 is a sectional view showing a grip portion according to the present invention, and FIG. 8 is a sectional view showing a mandrel member according to the present invention.

As shown in Figures 1 to 8 the present invention is a base member 100 is mounted on the rail 110 on the upper side to transfer the steel pipe 10, and formed on the rear side of the base member 100, the length is variable Moving means 200 having a cylinder rod 230 to be passed and the steel pipe 10 is passed, and the movement means 200 is linked to the cylinder rod 230 and the moving hole 312 through which the steel pipe 10 is passed. The press member 300 and the base member 100, which are formed of a contact plate 320 which is in contact with the rear side of the steel pipe 10 and closes a predetermined portion of the formed press plate 310 and the moving hole 312. A heater member 400 formed at the front side of the press member 300 and formed in a coil shape and emitting high frequency, and a mounting member 350 formed at the base member 100 and formed at the front of the heater member 400. ), And formed on the base member 100 and installed to the rear side of the moving means 200 Fixing member 500 having a movable grip 520, one side is fixed to the fixing member 500 and the other side is mounted to the mounting member 350, but is inclined from one side to the other side and the diameter of the other side is a steel pipe ( It consists of a mandrel member 600 larger than the inner diameter of 10).

Accordingly, the steel pipe 10 is transferred along the rail 110 to pass through the moving means 200 and the press member 300 to be in contact with the press member 300. Here, when the steel pipe 10 passes so that the steel pipe 10 is extrapolated to one side of the mandrel member 600, the grip part 520 is moved upward.

Then, the moving means 200 is moved by the high frequency of the heater member 400 from the front side of the steel pipe 10 as the press member 300 moves forward.

The steel pipe 10 heated at a high frequency is expanded by the press member 300 on the other side of the mandrel member 600.

On the other hand, the material of the steel pipe 10 according to an embodiment of the present invention uses chromium molybdenum alloy. It is possible to use the chromium molybdenum alloy as a steel pipe 10 material can be used in high temperature, high pressure, low temperature environment, and good durability and corrosion resistance to transport high pressure liquid and gas. Conventional welded steel pipes have a phenomenon of corrosion or bursting due to pressure in high temperature, high pressure, low temperature, and corrosive environments.

Hereinafter, each configuration will be described in detail.

The base member 100 is made of a strong metal material in a long frame in the longitudinal direction is installed on the ground.

And, the upper surface is provided with a rail 110 for moving the steel pipe 10, the moving means 200 for sequentially pressing the steel pipe 10, the press member 300 in contact with the steel pipe 10, the mandrel This is to sequentially install the fixing member 500 for fixing the member 600.

Here, the rail 110 is provided with a plurality of rollers to move the steel pipe 10 by rotating the roller (112).

On the other hand, the power to rotate the roller 112, the movement means 200 and the various devices uses electricity and will not be described in detail.

The moving means 200 is formed on the upper surface of the base member 100 to move the press member 300 to the front.

Moving means 200 according to an embodiment of the present invention is formed in a position spaced a predetermined distance apart from the rear end of the base member 100 by the length of the steel pipe 10 so that the steel pipe 10 is supplied by the hydraulic cylinder The press member 300 is moved forward.

Preferably, the moving means 200 is a moving plate 210 formed with a hole to pass through the steel pipe 10, the cylinder housing 220 mounted to the moving plate 210, and the cylinder housing 220 In the interior is made of a cylinder rod 230 is variable in length.

Here, the moving plate 210 is made of a structure capable of receiving power in a plate shape, the hole is formed in the center so that the steel pipe 10 passes. In addition, the movable plate 210 is fixed to the base member 100.

In addition, the cylinder housing 220 is formed on the moving plate 210 to receive power to advance the cylinder rod 230 back and forth so that the press member 300 is interlocked.

In particular, the moving means 200 is preferably configured to be a plurality of consecutive. This is because the length of the cylinder rod 230 is limited, and because the diameter of the cylinder rod 230 is small, it is difficult to press the steel pipe 10 while supporting a heavy load.

The press member 300 is formed in a plate shape, is formed in the front side of the moving means 200 is in contact with the steel pipe (10). That is, coupled to the end of the cylinder rod 230 is interlocked with the variable length to move forward and backward.

The press member 300 according to the embodiment of the present invention is linked to the cylinder rod 230 and the press plate 310 formed with a moving hole 312 so that the steel pipe 10 passes in the same way as the moving plate 210. ) And a contact plate 320 formed in a pair at the edge of the moving hole 312 to close a part of the moving hole 312 according to the vertical movement of each other.

Accordingly, when the steel pipe 10 passes through the moving means 200 and the press plate 310 by the rail 110, the contact plate 320 completely opens the moving hole 312. Done. When the passage of the steel pipe 10 is completed, the contact plate 320 closes a part of the moving hole 312 so that the contact plate 320 and the steel pipe 10 come into contact with each other.

In detail, the press plate 310 is interlocked with the cylinder rod 230 to advance the upper surface of the base member 100 to press the steel pipe 10. In addition, the press plate 310 is formed with a movement hole 312 larger than the diameter of the steel pipe 10 so that the steel pipe 10 passes.

In addition, the contact plate 320 has two upper plates 322 and two lower plates 324 move up and down along the guide, and the upper plate 322 and the lower plate 324 are recessed in a semicircular shape to correspond to each other. . In particular, when the upper plate 322, the lower plate 324 is moved up and down along the guide so that the groove corresponds to the diameter of the upper plate 322, lower plate than the steel pipe 10, and larger than the introduction portion of the mandrel member 600 .

This is to press the rear end of the steel pipe 10 by the contact plate 320, the introduction portion 610 is always passed through the press member 300 is fixed to the fixing member 500.

The heater member 400 is formed in a circular tube shape, is formed on the front side of the base member (100).

The heater member 400 includes a vertical frame 410 formed on both sides of the base member 100 and a high frequency heat treatment device 420 having a circular tube shape mounted between the vertical frames 410.

Then, the steel pipe 10 is passed into the high frequency heat treatment machine 420 to transfer the heat of 800 ° C or more.

The heater member 400 is heated before the steel pipe 10 is inserted into the mandrel member 600, which will be described later, to increase the elongation without changing the internal structure of the steel pipe 10 when expanding the steel pipe 10 This is to increase the productivity stably by reducing the circumferential direction and the longitudinal stress of the steel pipe 10 generated during expansion of the tube.

Mounting member 350 according to an embodiment of the present invention is located on the front side of the heater member 400 is mounted to the rear side of the mandrel member 600 to be described later.

The mounting member 350 includes a receiving part 352 on which the mandrel member 600 is mounted and a supporting part 354 having rollers on both sides of the receiving part 352.

Here, the receiving portion 352 simply mounts the rear lower surface of the mandrel member 600. This is because the mandrel member 600 has a long structure in the longitudinal direction, so that it is difficult to keep the front end portion by the fixing member 500 to be horizontal to the ground.

In addition, the support part 354 is in contact with the outer circumferential surface of the steel pipe 10 in which rollers are extended to both sides in order to move the steel pipe 10 extended in the mandrel member 600 in a straight direction.

Preferably, the mounting member is further provided with a transmission unit 370 is formed with a rail for moving the expanded steel pipe (10). This is a part for transferring the steel pipe 10 passing through the mandrel member 600 to another process, the rail is composed of a plurality of rollers.

The fixing member 500 is formed on the rear side of the moving means 200 to fix the introduction portion 610 of the mandrel member 600. As a result, the mandrel member 600 has a lower portion spaced apart from the base member 100 by a predetermined height.

The fixing member 500 according to the embodiment of the present invention is formed on the base member 100, and provided with a grip part 520 that is installed to the rear of the moving means 200 and is movable up and down, to the grip part 520. The mandrel member 600 introduces and grips the 610 of the introduction portion 610.

This, when the steel pipe 10 is supplied from the rear side of the base member 100, it is to interpolate the introduction of the mandrel member 600. However, the mandrel member 600 is gripped and fixed by the grip part 520, and the steel pipe 10 may not move forward due to interference with the grip part 520. In this case, when the grip part 520 moves upward and the steel pipe 10 passes completely, the grip part 520 moves downward again to grip the introduction part 610.

Preferably, the fixing member 500 is composed of a guide portion 510 formed in pairs on the rear side of the moving means 200 and a grip portion 520 moving along the guide portion 510 in a 'c' shape. .

In addition, a locking groove 616 is formed at both sides of the grip part 520.

Here, the locking groove 616 is to prevent the locking hole 614 of the mandrel member 600, which will be described later, to be caught and prevent the mandrel member 600 from moving downward and a detailed description thereof will be described later.

In addition, the grip part 520 moves along the guide part 510 so that the mandrel member 600 is positioned at the center.

Mandrel member 600 according to an embodiment of the present invention, one side is fixed to the fixing member 500, the other side is mounted to the mounting member 350, is formed to be inclined from one side to the other side and the diameter of the other side of the steel pipe ( Is larger than the inner diameter of 10).

Therefore, when the steel pipe 10 in contact with the press member 300 is moved by the moving means 200, the steel pipe 10 to the other side in the state in which the hollow inside is inserted into one side of the mandrel member 600. Will move. When the steel pipe 10 is moved by a certain distance, the other side of the mandrel member 600 approaches, and the expansion of the steel pipe 10 proceeds from the moment of contact with the other side of the mandrel member 600.

In addition, the mandrel member 600 may be made of a metal material, or may be made of an alloy made of chromium-nickel and pure iron, so that hardness may be improved. In general, the hardness of the mandrel member 600 is preferably maintained at about 350HB or more.

Preferably, the mandrel member 600 is connected to the cylindrical inlet 610 and the inlet 610, the inclined portion 620 is formed to be inclined to the other side, the end of the inclined portion 620 It is made of a holding portion 630, the diameter of the holding portion 630 is larger than the diameter of the introduction portion 610, the diameter of the holding portion 630 is preferably made larger than the inner diameter of the steel pipe (10). This is to minimize deformation of the steel pipe 10 due to rapid expansion.

The introduction portion 610 is formed to be long in the longitudinal direction end is fixed to the fixing member 500.

And, by limiting the inner diameter of the minimum steel pipe 10, when the steel pipe 10 is less than the diameter of the introduction portion 610 is supplied, the structure of the steel pipe 10 is changed to a sudden expansion pipe. Therefore, the introduction portion 610 is formed in a cylindrical shape, the steel pipe 10 is the first portion is inserted when moving forward.

Preferably, the end of the introduction portion 610 is formed with a locking hole 612 penetrating to the side, the locking hole 612 is inserted into the locking hole 612 to protrude to both sides. Here, the width of the locking hole 614 is manufactured to correspond to the width of the locking groove 616.

Therefore, when the locking hole 614 is mounted to the locking hole 612 and formed in the fixing member 500, the locking hole 614 is caught over the locking groove 616 of the grip part 522 so that the mandrel is closed. The member 600 is fixed at a predetermined position. On the contrary, when the catch 614 is removed, the end of the introduction part 610 is inclined toward the upper surface of the base member 100. That is, whether the mandrel member 600 is fixed to the fixing member 500 is determined depending on whether the locking hole 614 is mounted.

Thus, the steel pipe 10 is supplied from the rear side of the base member 100 to pass through the fixing member 500. That is, the engaging portion 614 is separated into the engaging hole 612 so that the introduction portion 610 is in contact with the base member 100. Then, when the steel pipe 10 is supplied by the rail from the rear side of the base member 100 and passes through the fixing member 500, the steel pipe 10 is forcibly inserted into the introduction part 610 in contact with the base member 100. . When the passage of the steel pipe 10 is completed, the introduction part 610 is lifted and the locking hole 614 is inserted into the locking hole 612 so that the locking hole 614 is a locking groove of the grip part 520. It is formed over the 616 to the horizontal mandrel member 600 and the base member 100.

The inclined portion 620 is formed at the end of the inlet portion so that the diameter is sequentially increased. That is, the cross section of the inclined portion 620 becomes larger inclined from the introduction portion to the other side, and is similar to the shape of cutting off the sharp end of Koggal.

Therefore, the steel pipe 10 is in contact with the same portion as the diameter of the inclined portion 620, the expansion of the steel pipe 10 is made by the pressing of the press member 300, the other side of the inclined portion 620 It is expanded to the maximum diameter.

The holding part 630 is formed on the other side of the inclined part 620 so that the diameter of the expanded steel pipe 10 is maintained.

The diameter of the holding part 630 is smaller than the maximum diameter of the other side of the inclined part 620. This is, when the steel pipe 10 is rapidly expanded, and then passes through the inclined portion 620 will be partially contracted. At this time, if the diameter of the shrinking steel pipe 10 is kept the same, cracks such as cracks may occur, so that the diameter of the holding part 630 is smaller than the maximum diameter of the other side of the inclined part 620.

Preferably, the holding part 630 is a shape holding part 632 for maintaining a shape in which the steel pipe 10 is expanded, and an extension holding part 634 connected to the rear side of the shape holding part 632. Characterized in that made.

This is because the shape maintaining part 632 is to prevent a sudden contraction, as described above, the extension holding part 634 is to guide the long length of the steel pipe 10 to move in a straight direction.

As described above, it is a basic technical idea to heat the steel pipe by using a heat treatment device generating a high frequency, insert the heated steel pipe into the mandrel member, and expand the pipe. This is merely an example, and has a general knowledge in the art. Those skilled in the art will understand that various modifications and equivalent embodiments are possible from this, and the true technical protection scope of the present invention should be defined only in the appended claims.

10: steel pipe 100: base member
110: rail 200: moving means
230: cylinder rod 300: press member
310: press plate 320: contact plate
400: heater member 350: mounting member
500: fixing member 520: grip portion
600: mandrel member

Claims (8)

In the steel pipe (10) expansion device,
A base member 100 on which a rail 110 is mounted to transfer the steel pipe 10;
A moving means (200) formed at a rear side of the base member (100), having a cylinder rod (230) of variable length, and through which a steel pipe (10) passes;
The moving means 200 is interlocked with the cylinder rod 230 and the press plate 310 is formed with a moving hole 312 through which the steel pipe 10 passes, and a certain portion of the moving hole 312 is closed and the steel pipe ( A press member 300 formed of a contact plate 320 in contact with a rear side of the 10;
A heater member 400 positioned at the front side of the base member 100 and configured to radiate high frequency;
A mounting member 350 positioned at the front side of the heater member 400;
A fixing member 500 formed on the base member 100 and installed at a rear side of the moving means 200 and having a grip part 520 capable of moving;
One side is fixed to the fixing member 500, the other side is mounted to the mounting member 350, is formed inclined from one side to the other side and the diameter of the other side is composed of a mandrel member 600 larger than the inner diameter of the steel pipe (10) Became,
The steel pipe 10 is transported along the rail 110 to pass through the moving means 200 and the press member 300 to be in contact with the press member 300, so that the steel pipe 10 is inserted into one side of the mandrel. When passing, the grip part 520 is a steel pipe expansion device having a mandrel, characterized in that moved to the upper side.
The method of claim 1,
The mandrel member 600,
An introduction part 610 fixed to the fixing member 500 in a cylindrical shape;
An inclined portion 620 connected to an end of the introduction portion and formed to be inclined toward the other side;
Is connected to the end of the inclined portion 620 and the holding portion 630;
The diameter of the holding portion 630 is larger than the diameter of the introduction portion, the diameter of the holding portion 630 is larger than the inner diameter of the steel pipe, the pipe apparatus with a mandrel.
The method of claim 2,
The holding unit 630,
Steel pipe 10 with a mandrel characterized in that it consists of a shape holding part 632 for maintaining the shape in which the steel pipe 10 is expanded, and an extension holding part 634 extending to the rear side of the shape holding part 632. Device.
The method of claim 1,
The moving means 200,
A moving plate 210 having a hole formed therethrough so that the steel pipe 10 passes, a cylinder housing 220 mounted to the moving plate 210, and a cylinder rod 230 having a variable length in the cylinder housing 220. ),
Steel pipe expansion device having a mandrel, characterized in that the movement means 200 is formed in succession.
The method of claim 2,
The press member 300,
The press plate 310 interlocked with the cylinder rod 230 and the moving hole 312 is formed to pass through the steel pipe 10, and is formed in a pair, one side of which is moved upward and the other side of which is moved downward. Made of a closing contact plate 320,
When the contact plate 320 is closed to close a part of the moving hole (312), the steel pipe (10) is not moved, the introduction pipe is characterized in that the steel pipe expansion device provided with a mandrel. The method of claim 2,
The fixing member 500 is
Steel pipe expansion device having a mandrel, characterized in that consisting of a guide portion 510 formed in pairs on the rear side of the moving means 200 and a grip portion 520 moving along the guide portion 510 in a 'c' shape. . The method of claim 6,
The grip part 520 is,
Steel pipe expansion device having a mandrel, characterized in that the engaging groove 616 is formed on both sides of the inner circumference. The method of claim 7, wherein
The introduction unit 610,
The hook hole 612 is formed at the end, and the mandrel characterized in that the hook hole 614 is further provided corresponding to the width of the locking groove 616 is inserted into the locking hole 612 and protrudes to both sides Steel pipe expansion device.

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