KR20010028044A - manufacturing apparature of metal bellows-pipe - Google Patents

Abstract

PURPOSE: A producing device for a metal bellows pipe is provided to have elasticity and restoring force with creases and to massively produce the metal bellows pipe using dies. CONSTITUTION: A metal bellows producing device comprises a die base; plural operating cylinders moving forward or backward by hydraulic pressure; a pair of first die blocks (312,314) interlocking with the operating cylinders; a pair of second die blocks (322,324) interlocking with the operating cylinders and sliding on the first die blocks while supporting the outer circumference of a pipe material (900); a fluid feeding unit feeding fluid to the pipe material; a water pressure guide unit expanding the pipe material with fluid; and a movement controller controlling the operating cylinders to form creases and separating the dies from the creases portion. The movement controller contains plural solenoid valves transmitting hydraulic pressure to the operating cylinders; and a control unit outputting a control signal to move one of dies backward after forming the creases portion. Therefore, the metal bellows pipe has many creases without damage.

Description

Manufacturing apparature of metal bellows-pipe

The present invention relates to an apparatus for manufacturing a metal bellows pipe, and in particular, by forming a corrugated shape in a redundant curved structure to improve the functions such as elasticity and restorability, and also to manufacture a metal bellows pipe that enables mass production with a mold. It is about.

Generally, metal bellows pipe is used for precision equipment requiring high vacuum, elasticity, stability and vibration absorption in various fields such as aerospace, semiconductor manufacturing, nuclear power facilities, etc. It has been used for the purpose of preventing foreign matter penetration and cushioning and absorption against vibration shock.

Conventional metal bellows tubes are classified into U type and welded type according to their manufacturing method.

Among them, the welding type has a process of manufacturing each corrugation of the corrugated portion by welding to the outer circumferential surface of the cylindrical pipe to be welded. The U-type bellows tube is manufactured by mold for mass production, and the structure of the cylindrical bellows tube is the corrugated portion. And flanges, and the peaks and valleys of the corrugations have a "U" shape.

On the other hand, the metal bellows tube has a large difference in the absorption and buffering rate of shock and vibration according to the shape of the corrugation, and the absorption and buffering rate of the shock and vibration are increased when the corrugation has a curved shape. As the shape of the mountain increases, the elastic force and the restoring force are increased, and also the structural characteristics show a great difference in elasticity and the resilience according to the change of the height and the thickness of the mountain.

For this reason, the metal bellows pipe is U-type welded bellows tube having the advantages of forming due to its structural characteristics of forming the wrinkles of the pleats into the curved structure and then welding them integrally to the outer surface of the cylindrical tube. It has better resilience and elasticity than Bellows tube.

According to the "bulging processing apparatus" of Japanese Patent Application Publication No. 44-24746, which is an example of a U type that is manufactured in a mold, one type of inflating the bead part using internal pressure and generating axial compression using a metal mold is used. Forming a good bellows portion in a step is disclosed.

In addition, according to Japanese Patent Laid-Open Publication No. 59-133021, "Method and Apparatus for Manufacturing Wrinkle Tube", two core rods having an elastic body inserted therein are inserted into the tube, and one core rod deforms the elastic body toward the other core rod. Pressurized, a portion of the tube is retracted to form an inflation angle, and the expanded portion is shaped to conform to the bending mold to form a corrugated tube.

An example of a conventional apparatus for manufacturing a metal bellows tube manufactured by a mold is disclosed in Korean Patent Publication No. 92-3510, "Method and Apparatus for Manufacturing a Bellows Tube," and as shown in FIG. ) Is fixed to the base 15, the movable core 1 is supported on the base 15, is moved in the axial direction of the core by the core drive cylinder 7, the workpiece tube 16 is fitted .

The fixed guide 11 is fixed to the base 15 at the central position of the movable core 1 to guide and support the movable core 1 and the tube 16, and to deflect the tube 16 and the movable core 1. prevent.

The movable guide operation cylinder 13 is fixed on the base 15 in the vicinity of the fixed core 2, and the movable guide 12 attached to the fixed core fixes and clamps the fixed core 2 so that the fixed core ( Prevents warpage in 2).

The punch 4 having a larger inner diameter than the outer diameter of the tube 16 is supported by the punch holder 4a so as to be movable along the tube 16.

The rods 17a and 17b guided by the shaft guides 14a and 14b are helically coupled to the punch holder 4a and the punch drive cylinder 8a so that the punch 4 can be moved along the pipe 16. 8b is driven in parallel with the movable core 1.

A chuck holder 5a is disposed between the punch 4 and the movable guide 12, and the chuck holder is moved along the pipe 16 by the chuck moving cylinder 10.

The front stopper 19 for the chuck holder is disposed adjacent to the punch holder 4a.

The chuck holder 5a supports the chuck 5 and the chuck inner block 5 'assembled therein, and the gap 6 between the chuck 5 and the chuck inner block 5' can be adjusted to the required width. have.

The chuck 5 and the chuck inner block 5 ′ may be moved toward or away from the tube 16 by a chuck operating cylinder 9 secured to the chuck holder 5a.

The conventional bellows tube of such a structure can be restrained to a minimum by reducing the thickness of the tube when manufacturing a mold, and thus has a function of preventing damage to the elastic body. Since the edge portion of the mold is likely to be severely damaged due to a bump between the curved acid and the peak of the wrinkle part, not only the defect rate of the component is high but also manufacturing difficulties.

Therefore, the existing bellows tube of the U type is limited in the shape of the corrugated portion is not used where a lot of durability, elasticity and high vacuum is required, a welded bellows tube having a structural characteristic of the corrugated portion is employed.

However, the welded bellows pipe has a manufacturing cost that is significantly increased compared to the bellows pipe manufactured by the mold due to a disadvantage in the manufacturing process of welding the corrugations of the corrugated portion to the cylindrical pipe to be processed one by one. There was a problem that is greatly reduced.

The present invention has been made in view of the above-mentioned problems, and an object thereof is to provide a manufacturing apparatus of a metal bellows pipe, which has a structural advantage of a welded mold, thereby enabling mass production.

1 is a cross-sectional view showing a mold apparatus of a conventional metal bellows tube,

2 is a configuration diagram schematically showing the operating principle of the apparatus for manufacturing a metal bellows pipe according to the present invention;

3 is a perspective view showing an embodiment of an apparatus for producing a metal bellows tube of the present invention;

4 is a front view of FIG. 3;

5 is an enlarged partial cross-sectional view showing the main portion of FIG.

6 is a rear view of FIG. 5;

7 is an exploded perspective view showing a mold of the present invention,

8 is an exploded perspective view showing the hydraulic guide portion of the present invention,

9 is a use state diagram of the present invention,

10 is a perspective view showing a metal bellows tube manufactured by the apparatus of the present invention.

Explanation of symbols on the main parts of the drawings

100: mold base 200: operation cylinder

250: hydraulic control unit

312,314: 1st mold block

322,324: 2nd mold block

400: fluid supply part 410: water tank

420: hydraulic pressure supply cylinder 430: hydraulic pressure adjustment unit

440: hydraulic pipe 450: fluid supply pipe

500: hydraulic pressure guide portion 510: solenoid valve

520 control unit 900 processed pipe

The apparatus for manufacturing a metal bellows tube of the present invention for achieving the above object is a plurality of the base and the front and rear and the left and right of the mold base, respectively, and selectively move forward / backward as the hydraulic pressure is supplied. With working cylinder,

A first mold block coupled to interlock according to the forward / backward operation of the operation cylinder to move forward / backward;

A set of second mold blocks slidably coupled to the first mold block and interlocked according to the forward / backward movement of the operation cylinder and movable left and right and supporting the outer circumferential surface of the pipe to be processed on the inner side;

A hydraulic pipe connected to an end of the pipe to be transported with a constant pressure of fluid acting from inside to outside on a portion of the pipe to be supported by the second mold block;

A hydraulic guide portion for guiding fluid supplied from the hydraulic pipe onto a portion of the pipe to be expanded to expand an outer surface of the pipe;

The internal pressure of the hydraulic pipe is transmitted to control the operation of each working cylinder so that a part of the processed pipe whose outer surface is deformed is formed in a duplicate curved corrugation shape, and the mold is detachable from the curved corrugation. And motion control means for controlling the reverse motion.

Hereinafter, with reference to the accompanying drawings will be described in detail an embodiment of the apparatus for producing a metal bellows tube according to the present invention.

Figure 2 is a schematic representation of the operating principle of the apparatus for manufacturing a metal bellows pipe of the present invention, the operation of the first and second mold blocks (312,314, 322,324) before and after the operation cylinder 210 and the operation cylinder (210) The left and right operation cylinder 220 is shown to be operated sequentially by the operation, the arrow indicates the movement progress direction, the number indicates the operation sequence.

3 to 9, the apparatus for manufacturing a metal bellows tube according to an embodiment of the present invention may include a mold base 100 having a water tank 410 embedded therein, and a front, back and left sides of the mold base 100. First and second mold blocks 312 and 314 and 322 and 324 which are mounted on the right side, the operation cylinder 200 and the forward / backward operation by the operation of the operation cylinder 200 are gripped by the pipe 900 to be processed, and the pipe to be processed. A fluid supply unit 400 for supplying a constant pressure fluid into the interior of the 900, a hydraulic guide unit 500 for inducing the fluid onto a portion of the pipe 900 to expand the outer surface of the portion; In accordance with the movement of the 1.2 mold blocks (312,314) (322,324), it is roughly divided into motion control means for controlling the operation of the 1.2 mold blocks (312,314, 322,324) so as to form a corrugation on the outer circumferential surface of the workpiece pipe (900). .

Mold base 100 is composed of a lower body 110 and the upper body 120, the water tank 410 is built in the interior of the lower body 110 in the form of a box, the upper body 120 is the lower body A pair of front and rear mold plates 125 spaced apart from each other so as to face each other on the upper side of the 110 is provided.

The operation cylinder 200 is operated by hydraulic pressure, and is installed on the outer surfaces of the front and rear mold plates 125, respectively, and the forward and backward operation cylinders which impart the forward and backward movement force of the first mold blocks 312 and 314 ( 210 and the first and second mold blocks 312 and 314, respectively, may be divided into left and right operation cylinders 220 that provide left and right movement force to the second mold blocks 322 and 324.

The front and rear operation cylinders 210 and the left and right operation cylinders 220 are provided with respective hydraulic pressure adjusting units 250 so as to operate with a constant hydraulic pressure, respectively.

1.2 mold blocks (312,314) (322,324) are each formed in a set to be opposed to each other, wherein the first mold blocks (312, 314) are installed on the upper side of the mold base 100 to be reversed, The two mold blocks 322 and 324 are installed on the inner surfaces of the first mold blocks 312 and 314 so as to be movable in left and right directions.

In addition, the first mold blocks 312 and 314 are axially coupled to the fixed shaft 150 installed in the uniaxial direction between the mold plates 125 and supported to slide forward and backward, and the second mold blocks 322 and 324 are supported by the first mold blocks. It is supported by the guide rails 315 formed on the 312 and 314 so as to be slidably moved in the left and right directions.

A set of molds are installed on the inner surfaces of the first mold blocks 312 and 314 and the second mold blocks 322 and 324, respectively, and the inner edge of each mold is formed in a tapered shape corresponding to the pleat shape. have.

The operation control means includes a plurality of solenoid valves 510 for selectively supplying hydraulic pressure to each of the operation cylinders 200, and selectively supplying power to the respective solenoid valves 510 to operate the respective operation cylinders 200. The control unit 520 for controlling the operation of the) is included.

The controller 520 outputs a control signal for temporarily backing the first mold block 314 on the other side after the wrinkles of the pipe 900 are formed.

The solenoid valve 510 is operated by an electrical signal to selectively open and close the hydraulic supply flow path of the operation cylinder 200.

The hydraulic guide part 500 has a discharge hole 442 formed at the end of the hydraulic pipe 440 so that water is discharged to the outside, and the plurality of packings 700 are fitted to the outer peripheral surface of the end of the hydraulic pipe 440. Is made of.

The packings 700 include first and second packings 710 and 720 which are in surface contact with the mold 330 of the second mold block 322 and the mold 340 of the second mold block 324, and the packing thereof. The third packing 730 and the fourth packing 740 and the packing for maintaining the gap at the end of the hydraulic pipe 440 is installed between the (710, 720) having a hole 732 to match the discharge hole 442 It consists of a fixing ring 750 for fixing.

The fluid supply unit 400 receives water from the water tank 410 embedded in the lower body 110 of the mold base 100 and water from the water tank 410 so as to have water pressure above a predetermined pressure by hydraulic force. Hydraulic pressure supply cylinder 420 to compress, the hydraulic pressure adjusting unit 430 for adjusting the pressure of the water compressed in the hydraulic pressure supply cylinder 420 to a predetermined constant pressure, and the hydraulic pressure compressed from the hydraulic pressure adjusting unit 430 It is to include a fluid supply pipe 450 that is a hollow (hollow) pipe for transferring to the inside of the).

In addition, in order to control the movement of the 1.2 mold blocks 312 and 314 and 322 and 324, a sensor unit 610 made up of each sensor is installed on one side of the mold base 100, and the sensor of the sensor unit 610 is provided. The sensing unit 620 is installed on one side of the first and second mold blocks 312 and 314 and 322 and 324 which are moved correspondingly.

For example, the sensor unit 610 may employ a set of limit switches, which is the position of the sensing unit 620 installed in the 1.2 mold blocks 312, 314, 322, 324 when the 1.2 mold blocks 312, 314, 322, 324 are moved. When the contact with the sensor unit 610 is changed, it is to control the movement of the 1.2 mold blocks (312,314) (322,324) by blocking the hydraulic pressure supplied to the operation cylinder (200).

Reference numeral "270" denotes a drive motor 270 that provides a driving force for supplying hydraulic pressure to each operation cylinder 200, the driving force of the drive motor 270 drives a hydraulic pump (not shown). To supply the required hydraulic pressure to the operation cylinder (200).

The operation of the present invention having such a configuration is as follows.

The process for forming the workpiece pipe 900 into a bellows tube with continuous corrugation is performed sequentially. First, the molds 330 and 340 are coupled to the inner edges of the second mold blocks 322 and 324. In the process of fixing the 900 to the inner surfaces of the molds 330 and 340 installed in the 1.2 mold blocks 312 and 314 and 322 and 324, when the user turns on the control unit 520, an electrical signal is transmitted from the control unit 520 to the solenoid valve ( 510, the solenoid valves 510 are opened and closed, so that each operation cylinder 200 and the hydraulic pressure supply cylinder 420 are sequentially operated to move the 1.2 mold blocks 312,314 (322,324) before, after, and It will move left and right.

At this time, when hydraulic pressure is supplied to the forward and backward operation cylinders 210 installed on the outer surfaces of the first and second mold plates 125, the hydraulic force of the forward and backward operation cylinders 210 is applied to the first mold blocks 312 and 314. The first mold blocks 312 and 314 are slid to the outer circumferential surface of the fixed shaft 150 to be moved toward the mold plate 125 on the other side by acting as a force to move from left to right in the drawing.

Thereafter, when power is applied to the solenoid valve 510 which determines the operation of the left and right operation cylinders 220, the second mold blocks 322 and 324 slide on the guide rails 315 of the first mold blocks 312 and 314. And move to the center.

The molds of the second mold blocks 322 and 324 moved to the center side are in close contact with the outer circumferential surface of the pipe 900 to be gripped to fix the pipe 900 to be processed.

On the other hand, the connection of the workpiece pipe 900 and the hydraulic pipe 440 is fixed by inserting a portion of the inside of the workpiece pipe 900 before the end of the workpiece pipe 900 is fixed to the second mold blocks (322,324). It would be desirable to bind.

The process of expanding and forming the corrugation by providing water pressure on a portion of the workpiece pipe 900 fixed to the molds 330 and 340 is provided with hydraulic pressure to the hydraulic pressure supply cylinder 420 according to the operation of the solenoid valve 510. The water discharged from the water tank 410 by hydraulic pressure is compressed to a predetermined pressure or more and discharged to the fluid supply pipe 450.

At this time, before the water compressed by the fluid supply pipe 450 is delivered, the water pressure adjusting unit 430 adjusts the water pressure to a predetermined pressure and supplies the water pressure to the water pressure pipe 440.

Water to which the water pressure is transmitted from the hydraulic pipe 440 is discharged to the outside through the discharge hole 442 of the hydraulic pipe 440 and the hole 732 of the third packing 730 to expand the force to the pipe 900 to be processed. It will work.

Subsequently, when the pipe 900 is partially inflated to the outside, the first mold blocks 312 and 314 on both sides move toward the mold plate 125 on the right side of the drawing to press the expansion part in the axial direction. do.

The expanded portion to which the axial pressing force is transmitted is deformed into a corrugation shape corresponding to the shape of the tapered inner edge as the distance between the pair of first mold blocks 312 and 314 decreases, so that the pipe 90 is to be processed. One wrinkle is formed on the outside of the.

Meanwhile, a process of returning the molds 330 and 340 to an initial position is required in order to form the wrinkles again after one wrinkle is formed. In this case, the other side is prevented from hitting the wrinkles when the molds 330 and 340 are returned to their original positions. Temporary reverse operation of the first mold block 314 is generated.

The process of detaching from the outer circumferential surface of the pipe 900 to be processed has a process in which the second mold blocks 322 and 324 are moved left and right, and the first mold blocks 312 and 314 are moved forward to return to their original positions.

At this time, since the shape of the wrinkles of the pipe 900 to be overlapped and bent, the distance between the corrugation pitch of the first mold block 314 on the other side before the second mold blocks 322 and 324 are moved left and right. You must reverse temporarily for a shorter distance.

In the process of temporarily reversing the first mold block 314 of the other side, when the hydraulic pressure is temporarily lowered inside the front and back operation cylinders 210 supporting the first mold blocks 312 and 314, The force transmitted from the first mold block 312 acts as an inertial force, thereby temporarily reversing.

As a method of temporarily lowering the oil pressure of the forward and backward operation cylinders 210 supporting the first mold block 314 on the other side, the control unit 520 outputs a control signal for temporarily energizing the solenoid valve 510. The return flow path of the forward and backward operation cylinder 210 may be temporarily opened, or the hydraulic pressure supplied to the operation cylinder 200 may be temporarily blocked.

Thereafter, one side of the first mold block 312 is moved forward to grasp the outer circumferential surface of the pipe 900 to be processed, and then the first mold block 314 of the other side is separated from the pleats, and then the first mold of the one side. It is moved to the side of the block 312 to hold the outer peripheral surface of the pipe 900 to be returned to the initial position.

When the above process is repeatedly performed, a bellows pipe having a continuous corrugation is formed, and as shown in FIG. 10, flange portions 14 are formed at both sides, and outside the connection portion of the flange portion 14. On the side surface, a pleat portion 12 is formed in which the peaks 12a and the valleys 12b of appropriate heights are continuously formed, and the side portions connecting the peaks 12a and the valleys 12b of the pleats 12. A bent portion 12c that is bent a plurality of times is formed.

In addition, the bellows tube 12 and the bent portion 12c of the bellows tube 10 are preferably manufactured in a form similar to the conventional weld type described above in order to alleviate the fatigue of repetitive stretching movements.

Therefore, the metal bellows tube 10 completed through the above process has a mass productivity of mold making while maintaining the shape of an existing welded mold having structural advantages.

The present invention described above is not limited to the above-described embodiments, but may be modified as many as possible without departing from the spirit and concept of the present invention.

As described above, the apparatus for manufacturing a metal bellows tube of the present invention is to form a corrugated shape in a redundant curved structure to improve functions such as elasticity and restorability, and to make a mass production with a mold. Has the following effects:

First, since it maintains the structural advantages of the conventional welded type, it has the effect that the elasticity, resilience, etc. function is significantly improved than the conventional bellows tube of the U type manufactured.

Secondly, since it is possible to manufacture a mold, it has an advantage in mass production.

Third, since the contact generated during the separation process of the wrinkle portion and the mold is prevented, it is possible to prevent the failure factor due to the contact of the pipe to be processed.

Fourth, the bending is formed on the wrinkled surface between the acid and the bone, so it is strong in repetitive motion and fatigue load, and the fatigue load is dispersed before reaching the peak of the acid to prevent acid deformation, thereby improving the durability of the product. Have

Claims (4)

A plurality of operation cylinders 200 which are mounted on the mold base 100 and on the mold base 100 at the front, the rear, and the left and the right, respectively, and selectively move forward / backward as hydraulic pressure is supplied; A set of first mold blocks 312 and 314 coupled to interlock according to the forward / backward operation of the operation cylinder 200 to move forward / backward; It is coupled to the first mold blocks 312 and 314 so as to be slidable and interlocked according to the forward / backward operation of the operation cylinder 200 to move left and right and support the outer circumferential surface of the pipe 90 to be processed on the inner side. A set of second mold blocks (322, 324), A fluid supply unit 400 for supplying a fluid having a constant pressure acting from the inside to the outside on a part of the workpiece pipe 900 supported by the second mold blocks 322 and 324; A hydraulic guide part 500 for guiding the fluid supplied from the fluid supply part 400 onto a part of the workpiece pipe 900 to expand an outer surface of the workpiece pipe 900; The internal pressure of the hydraulic pipe 440 is transmitted to control the operation of each operation cylinder 200 so that a part of the pipe 900 whose outer surface is deformed is formed in a redundant curved corrugation shape. An apparatus for manufacturing a metal bellows pipe, characterized in that it comprises motion control means for controlling the forward and backward motion so as to be detachable from the curved corrugation. The method of claim 1, wherein the operation control means and a plurality of solenoid valves 510 for selectively supplying and operating the hydraulic pressure to the respective operation cylinder 200, Selectively applying power to the respective solenoid valves 510 to control the operation of each operation cylinder 200 and after the corrugation of the workpiece pipe 900 is formed, one of the first mold blocks 312 and 314 is removed. And a control unit (520) for outputting a control signal for temporarily reversing operation. The metal bellows pipe of claim 1, further comprising an oil pressure adjusting unit (250) which is opened and closed only when the oil pressure is higher than a set pressure so that a constant oil pressure is supplied into the operation cylinders (200). Manufacturing equipment. According to any one of claims 1 to 3, The fluid supply unit 400 is a water tank 410 embedded in the mold base 100, A water pressure supply cylinder 420 for receiving water from the water tank 410 and compressing the water to have a water pressure above a predetermined pressure; A hydraulic pressure adjusting unit 430 for adjusting the pressure of the water compressed by the hydraulic pressure supply cylinder 420 to a predetermined constant pressure; The metal bellows pipe, characterized in that it comprises a fluid supply pipe 450 for transferring the compressed water pressure from the pressure adjusting section 430 into the hydraulic pipe 440 connected to the workpiece pipe 900 Manufacturing equipment.