JPH07314053A - Flanging machine for pipe - Google Patents

Abstract

PURPOSE:To facilitate warm flanging even for a hard metallic pipe by changing the position of an extruding member from horizontal direction to vertical direction by means of a cylinder mechanism in accordance with the progress of a flanging operation. CONSTITUTION:A pipe 2 to be machined is fitted to a prescribed die 3 by a chuck mechanism and fixed horizontally in a working body 30 of a flanging machine. A heater mechanism is made close to or away from the end of a pipe 2 by the rotation and horizontal transfer of the mechanism so as to heat the inside surface of the end of the pipe 2. A pressurizing member 10 is rotated while it is abutted on the inside surface of the end of the pipe 2. With the use of a cylinder mechanism 11, the position of the pressurizing member 10 is changed from horizontal direction to vertical direction in accordance with the progress of a flanging working, and a flanging part is thereby formed at the end of the pipe 2 by plastic deformation. Thus, a residual stress is hardly increased at the flanging part, and corrosion caused by the increased of magnetic permeability is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for forming a durable flange portion on a thick pipe end portion by warm plastic deformation, and is also capable of expanding the pipe end portion. Regarding processing equipment.

[0002]

2. Description of the Related Art For conventional piping construction, a threaded joining method, a mechanical joint joining method, a butt welding joining method,
There are flange welding and stub end welding methods. When these joining methods are used for stainless steel pipes, there is a risk of leakage accidents or corrosion from welded parts, joint joints and threaded parts, and welding is performed at the work site, resulting in poor work efficiency and safe work. There is also a problem above. For this reason, we tried to achieve quality improvement and stability by factory processing with the aim of improving the efficiency of on-site work and labor and labor saving by subjecting the end of the pipe to flange processing at the factory and joining it with a loose flange. Has been.

As an existing bridging device, a device for forming a bridging portion by plastically deforming an end portion of a pipe is known, but, for example, an adjusting gap corresponding to various wall thicknesses of a pipe to be processed is provided. Due to structural defects such as not being applied, there still remains a problem that the applicability to pipes having different wall thicknesses and dimensions is generally low. Therefore, in order to overcome such problems and deficiencies, Japanese Patent Application Laid-Open No.
No. 5,158,837 is proposed.

[0004]

[Problems to be Solved by the Invention] Japanese Patent Laid-Open No. 55-1588
The device disclosed in Japanese Patent Publication No. 37 has high applicability to pipes to be processed having different sizes because the mounting position of the pressure bar can be adjusted. However, with this processing device,
Generally, since the pipe end is plastically deformed without heating, it is difficult to form a hard metal pipe such as a stainless steel pipe having a large wall thickness by flange forming. If the stainless steel pipe is flanged, residual stress and processing hardness increase at the flanged portion, and corrosion due to the increase in magnetic property, that is, magnetic permeability is likely to occur.

Further, the device disclosed in Japanese Patent Laid-Open No. 55-158837 is a single-function device that is only large in size as a whole, but is only capable of forming a flange on the end of the pipe. It is desirable that the factory premises cannot be expanded easily as the price of land rises as it is now, and that large equipment that cannot be easily moved is uneconomical if it has a single function, and if possible, it has multiple functions.

The present invention has been proposed in order to improve the above-mentioned problems associated with the conventional bridging apparatus, and the pipe end is preheated and then plastically deformed to corrode a thick pipe. It is an object of the present invention to provide a bridging processing device capable of forming a bridging portion that is difficult to perform. Another object of the present invention is to provide a bridging device which is capable of expanding a pipe end portion by using substantially the same member.

[0007]

In order to achieve the above-mentioned object, as shown in FIG. 1, a collar forming apparatus 1 according to the present invention is configured such that a pipe 2 to be processed is fitted into a predetermined mold 3 and is horizontally arranged. It has a chuck mechanism 4 (see FIG. 3) for fixing, and a heater mechanism 5 (see FIG. 2) for heating the inner surface of the pipe end by approaching or separating from the pipe end by rotation and horizontal movement. Mold 3
Is generally composed of an upper mold half 3a and a lower mold half 3b as shown in FIG.
It is preferable that the a is moved up and down to be opened, and four temperature sensors 26 are attached to the periphery of the mold at equal intervals. The heater mechanism 5 is a gas burner 7 that normally injects a flame toward the inner surface of the pipe end, and a heat shield plate 8 is attached to the rear of the burner so as not to thermally damage the inside of the processing apparatus 1.

As shown in FIGS. 4 and 5, the brim processing apparatus 1 further includes a pressing member 10 that rotates while contacting the inner surface of the pipe end, and a pressing member 10 according to the progress of the brim processing operation. And a cylinder mechanism 11 for changing the position from substantially horizontal to right angle. It is preferable that the cylinder mechanism 11 generally uses two hydraulic cylinders as one set and supports the pressing member 10 from both sides to rotate the pressing member 10. Pressing member 10
The shape of may be an ordinary cylindrical shape or a truncated cone shape.

As can be easily considered from FIG. 6, the bridging device 1 has a pressing member 1 which is maintained in a substantially horizontal state when expanding the pipe end portion by plastic deformation.
It is necessary to have another moving mechanism for changing the position of 0 to the outside with respect to the center of rotation according to the progress of the expanding work. Although not shown, a known rack-pinion mechanism, hydraulic cylinder, worm gear, etc. may be used as this moving mechanism.

The drive mechanism 12 for rotating and reciprocating the cylinder mechanism 11 including the pressing member 10 preferably has a structure as illustrated in FIG. Drive mechanism 12 shown in FIG.
Then, the support base 14 reciprocates along the guide bar 15 by the expansion and contraction operation of the hydraulic cylinders 13, 13, and
The mounting rotor 16 rotatably installed on the motor 4 is rotated by a motor (not shown) via a sprocket 17.

[0011]

In the bridging device 1 of the present invention, when the brim portion 18 (FIG. 5) is formed at the end of the pipe 2, the pipe end is preheated to about 200 to 250 ° C. by the heater mechanism 5. Then, since the pressing member 10 is brought into contact with the inner surface of the pipe end portion and is rotated while changing its position, a hard metal pipe having a large wall thickness can be relatively easily subjected to the bridging process, and the bridging part 18 has almost no processing hardness. Does not increase. The heater mechanism 5 is
By the rotation and horizontal movement, it can be compactly stored inside the device 1, and the heat shield plate 8 is attached to the rear side so that the inside of the device 1 is not thermally damaged.

As is apparent from FIG. 5, a gap 9 is formed between the lower peripheral surface of the flange portion 18 to be formed and the tip surface of the mold 3.
By having the above, the residual stress hardly increases in the flange portion 18, and corrosion due to the increase in magnetic property, that is, magnetic permeability does not occur. Due to this gap 9, it is impossible to perform accurate bridging unless the thickness of the pipe 2 to be processed is about 2 mm or more.

Further, in the bridging device 1, when the pipe end is expanded as shown in FIG. 6, the heater mechanism 5 heats the pipe end in advance, and the cylinder mechanism 11
With the pressing member 10 kept stationary in a substantially horizontal state, the pressing member 10 is rotated by contacting the inner surface of the end portion 19 of the pipe 41 to be processed. In the processing device 1, the pressing member 10 is relocated outward with respect to the center of rotation in accordance with the progress of the expanding work.

[0014]

EXAMPLES Next, the present invention will be explained based on examples.
As shown in FIG. 1, the brim processing apparatus 1 according to the present invention has a substantially rectangular parallelepiped shape as a whole, and a chuck mechanism 4 (in which a pipe 2 to be processed is fitted in a predetermined die 3 and fixed horizontally at a front portion thereof). (See FIG. 3). Four temperature sensors 26 are attached around the die 3 at equal intervals. Chuck mechanism 4
3, has upper and lower frames 20 and 21 of a semi-cylindrical shape to which the mold 3 is attached.
And the lower half mold 3b is fixed to the lower frame 21. Upper frame 2
0, that is, the upper mold 3a can move up and down along the guide pins 22 and 22. When the hydraulic cylinders 6 and 6 installed parallel to the guide pins 22 are contracted, the upper die 3a can be moved upward and the die 3 can be opened.

As is apparent from FIG. 1, the heater mechanism 5 is rotatably attached between the chuck mechanism 4 and the drive mechanism 12 inside the processing apparatus 1. Heater mechanism 5
Indicates a chuck mechanism 4 when rotating around the shaft 23 and horizontally moving along the guide pins 24, 24 from a substantially horizontal rest position (solid line in FIG. 2) to an operating position (dashed line in FIG. 2). There is no contact with the drive mechanism 12. The movement of the heater mechanism 5 is controlled by four temperature sensors 26 mounted around the mold 3, and the temperature sensors are controlled by the two temperature sensors 26 depending on the pipe material.
When the temperature of 00 to 250 ° C. is sensed, the gas supply to the heater mechanism 5 is stopped and the heater mechanism is moved to the rest position.

The heater mechanism 5 is appropriately piped from a gas cylinder (not shown) installed outside the apparatus, and a gas burner 7 for injecting a flame toward the inner surface of the pipe end is provided at the tip thereof.
Is installed, and a circular heat shield plate 8 is attached to the rear of the burner so as not to thermally damage the inside of the processing apparatus 1. Although not shown, an annular heat shield plate is separately attached to the inner end surface of the mold 3.

A work body 30 (see FIG. 4) in which the pressing member 10 and the cylinder mechanism 11 are installed is attached to the drive mechanism 12. The drive mechanism 12 has a rectangular support base 14 as illustrated in FIG. 1, and the support base is the hydraulic cylinder 1.
It is possible to move back and forth by the expansion and contraction operations of 3, 13. The support base 14 can be moved along the guide bar 15 arranged on one side until the sleeve 31 contacts the stopper 32, and the mounting rotor 16 is rotatably installed on the support base 14. The mounting rotor 16 is rotated by a motor (not shown) via a sprocket 17, and is spline-coupled with the sprocket. The rear projection 34 of the work body 30 may be fitted to the tip 33 of the mounting rotor 16 and bolted or welded.

The work main body 30 of the collar processing device 1 is
As shown in FIGS. 4 and 5, the pressing member 10 that rotates while contacting the inner surface of the pipe end portion, and the cylinder mechanism 11 that changes the position of the pressing member 10 from substantially horizontal to a right angle according to the progress of the flange forming work. Consists of. The horizontally elongated block 35 having the truncated cone-shaped pressing member 10 formed at the center has a connecting shaft 36 passing through a curved through hole 38 provided in a side wall of a U-shaped flat support frame 37, and is substantially connected via the connecting shaft. The position can be changed within the range of 90 degrees. On the other hand, the cylinder mechanism 11
Generally, two hydraulic cylinders are used as one set, and each hydraulic cylinder has a rear end portion 39 axially mounted above the side wall of the support frame 37,
Moreover, the lower end thereof is connected to the connecting shaft 36.

As shown in FIG. 6, the bridging device 1 is capable of expanding the pipe end. When performing the expanding process, the mold is replaced and the mold 4 for the expanding process is used.
0, the cylinder mechanism 11 is stopped, and the pressing member 1 is attached.
It is necessary to keep 0 almost horizontal. Although not shown, the support frame 37 and the rear protrusion 34
Are connected to each other so as to be displaceable with each other, and a rack-pinion mechanism or a separate hydraulic cylinder is installed between the two so that the support frame 37 can move in the vertical direction in the drawing. As a result, the pressing member 10 is repositioned outward with respect to its rotation center in accordance with the progress of the expanding work, while the contact peripheral surface with the pipe 41 is maintained in a substantially horizontal state. The expansion pipe 41 as shown in FIG. 6 can be easily manufactured.

In the flange forming device 1, when forming the flange forming part 18 (FIG. 5) at the end of the pipe 2 to be processed, first the upper mold 3a of the half mold is lifted to move the pipe 2 to the lower mold 3b. Insert into the inside and extend the hydraulic cylinders 6 and 6 to operate the upper mold 3a.
Is moved downward to close the die 3 and fix the pipe end horizontally. Then, the heater mechanism 5 is moved to a substantially horizontal rest position (see FIG. 2).
From the solid line) to the operating position (dashed line in FIG. 2),
Further, the gas burner 7 is moved horizontally along the guide pins 24, 24 to position the gas burner 7 at the center of the end portion of the pipe 2. The gas burner 7 injects a flame toward the inner surface of the pipe end to preheat the pipe end to a predetermined temperature. For example, when the temperature sensor 26 detects that the temperature has risen to 250 ° C. in the stainless steel pipe, the gas supply to the heater mechanism 5 is stopped by the feedback from the temperature sensor, and the heater mechanism 5 is returned to the almost horizontal rest position.

Next, the support frame 37 is moved forward by the drive mechanism 12 to bring the peripheral surface of the pressing member 10 into contact with the inner peripheral surface of the pipe 41. In this state, the support frame 37 is rotated by the drive mechanism 12, and the pressing member 1 is rotated in accordance with the progress of the collar processing.
The position of 0 is changed while contacting the inner surface of the end of the pipe. When the pressing member 10 is repositioned by about 90 degrees to the position shown by the solid line in FIG. 5, the brim processing is completed. There is a gap 9 of about 5 mm between the lower peripheral surface of the formed brim portion 18 and the front end surface of the mold 3, the residual stress hardly increases in the brim portion 18, and the magnetic property, that is, the magnetic permeability is also increased. Does not rise. When the bridging work is completed, the support frame 37 is moved backward and the mold 3 is opened to take out the bridging pipe 42.

[0022]

According to the bridging apparatus of the present invention, when the bridging portion is formed at the end of the pipe to be processed, the pipe end is accurately set to about 200 to 250 ° C. in advance by the heater mechanism.
Even if a hard metal pipe such as a thick stainless steel pipe having a thickness of about 2 mm or more is plastically deformed by being heated to, the brim can be easily worked in a warm state, and the working hardness of the brim is hardly increased. In this bridging device, there is a gap between the lower peripheral surface of the bridging portion to be formed and the tip surface of the die, and the residual stress hardly increases in the bridging portion, and the magnetic property, that is, the magnetic permeability. Does not cause corrosion.

The heater mechanism used in the present invention can be compactly housed inside the apparatus by its rotation and horizontal movement and can be automatically operated, so that it is possible to proceed with the machining work quickly without relying on human hands for heating. it can. A heat shield plate is attached to the rear of the heater mechanism so that the inside of the processing apparatus is not thermally damaged and the durability of the processing apparatus is not adversely affected.

Further, in the bridging device of the present invention,
When the pipe end portion is subjected to the expanding process, the cylinder mechanism may be kept stationary to keep the pressing member substantially horizontal, and the pressing member may be brought into contact with the inner surface of the end portion of the pipe to be rotated. In the processing apparatus of the present invention, if expansion processing is performed in addition to the flange processing of the pipe, another moving mechanism that changes the position of the pressing member outward with respect to the rotation center according to the progress of the work is required. And just

The processing apparatus of the present invention has both functions of pipe bridging and expanding. If the device of the present invention is laid in a processing plant, it is economical because it has multiple functions even if the factory site cannot be easily expanded due to the rise in land price,
Moreover, it is even more advantageous because the processing work can be carried out efficiently.

[Brief description of drawings]

FIG. 1 is a horizontal cross-sectional view schematically showing the entire brim processing apparatus according to the present invention.

FIG. 2 is a partial side view showing only a heater mechanism used in the present invention.

FIG. 3 is a cross-sectional view of the flange forming device of the present invention cut along the line AA in FIG.

FIG. 4 is a partial side cross-sectional view showing a start state of the flange end processing of the pipe end surface by the device of the present invention.

FIG. 5 is a side sectional view similar to FIG. 4, showing a finished state of the flange end processing of the pipe end surface.

FIG. 6 is a partial side cross-sectional view showing the end state of the expansion processing of the pipe end surface by the device of the present invention.

[Explanation of symbols]

 1 Flanging processing device 2 Pipe to be processed 3 Mold 4 Chuck mechanism 5 Heater mechanism 8 Heat shield plate 10 Pressing member 11 Cylinder mechanism 12 Drive mechanism 18 Flanging part

Claims (4)

[Claims] 1. A device for forming a flange portion on a pipe end by plastic deformation, which comprises a chuck mechanism for fitting a pipe to be processed into a predetermined die and horizontally fixing the pipe, and a pipe end by rotation and horizontal movement. Heater mechanism for heating the inner surface of the pipe end by approaching or separating the inner end of the pipe, a pressing member that rotates while contacting the inner surface of the pipe end, and a pressing member positioned from approximately horizontal to a right angle depending on the progress of the brim work. A brim processing device comprising a cylinder mechanism for changing the cylinder mechanism and a drive mechanism for rotating and reciprocating the cylinder mechanism including the pressing member. 2. When the pipe end is expanded by plastic deformation, the cylinder mechanism is stopped to maintain the pressing member in a substantially horizontal state, and the pressing member contacts the inner surface of the end of the pipe to be processed. The apparatus according to claim 1, further comprising another moving mechanism that rotates while contacting with each other, and that changes the position of the pressing member outward with respect to the center of rotation of the pressing member according to the progress of the expanding work. 3. A temperature sensor is attached to the periphery of a mold consisting of an upper mold half and a lower half mold, and when the temperature sensor senses a temperature of 200 to 250 ° C. according to the pipe material, gas to the heater mechanism is detected. The apparatus of claim 1, wherein the supply is stopped and the heater mechanism is moved to the rest position. 4. When a pipe to be processed having a thickness of about 2 mm or more is subjected to a warm bridging process, a gap is provided between the lower peripheral surface of the bridging portion to be formed and the tip surface of the die, A method of forming a pipe, in which residual stress hardly increases in the flange portion and magnetic property, that is, magnetic permeability does not increase.