JP2009154166A - Tube working method and its apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tube working method and an apparatus therefor, in which, even when using a plurality of kinds of clamps, a tube does not need to be reset in the other clamp, and a driving source for the other clamp does not need to be newly prepared. <P>SOLUTION: A second clamp 20 is moved inwardly in the radial direction of a tube 1 so as to clamp a part of a first to-be-worked part 1a from the outside in the radial direction, by making a second punch 40, which moves in the axial direction of a tube 1, to butt against the second clamp 20, which is provided on a first clamp 10 movably in the radial direction of the tube 1. Thereby, after the first to-be-worked part 1a is formed while clamping the tube 1 with the first clamp 10, a second to-be-worked part 1b is formed without setting the tube 1 in another clamp. In this a case, since the second clamp 20 is driven by the moving force of the second punch 40, a driving source exclusively used for the second clamp 20 does not need to be newly prepared. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a metal pipe processing method and apparatus for forming a pipe connection base on, for example, a pipe metal pipe.

  Conventionally, as a base of various pipes for circulating fluids such as gas and liquid, a reduced diameter part or an enlarged part of a predetermined shape is formed on the peripheral surface of the metal pipe by reducing or expanding a part of the metal pipe. What was made to form is known (for example, refer patent documents 1 and 2).

The metal pipes that serve as the base include cutting, rolling with a rotating roll, welding or brazing of the processed base parts, etc. As a processing method that is advantageous for shortening the processing time, a metal pipe is used. There is known a processing method in which a diameter is partially reduced or expanded by pressing in the axial direction with a punch.
JP 2000-291866 A JP 11-197769 A

  By the way, in the above-described processing method using the punch, when a part of the reduced diameter part is expanded after the diameter of the pipe is reduced, a clamp that holds the pipe when the diameter is reduced and a pipe that is held when the diameter is increased are clamped. Therefore, the pipe needs to be replaced with another clamp for expanding the diameter from the clamp for reducing the diameter, and there is a problem that the number of clamping processes increases and productivity is lowered.

  Therefore, as shown in FIG. 6 (a), a part of the pipe 1 is clamped from the outside in the radial direction by the first clamp 2, and the other part of the pipe 1 is moved by the first punch 3 that moves in the axial direction of the pipe 1. The first processed portion 1a is formed by reducing the diameter of the first processed portion 1a, and a part of the first processed portion 1a is sandwiched from the radially outer side by the second clamp 4 as shown in FIG. If the other part of the first processed part 1a is expanded by the second punch 5 moving in the axial direction to form the second processed part 1b, the clamp can be replaced when the diameter is expanded. It is not necessary and can be processed efficiently.

  However, there are many cases where there is only one clamping drive source consisting of a hydraulic system or the like in one processing apparatus. In order to drive the first and second clamps 2 and 4 independently, There has been a problem that the equipment cost has been increased because the processing apparatus having two drive sources has to be modified or replaced.

  The present invention has been made in view of the above problems, and the object of the present invention is to eliminate the need to replace the pipe with another clamp even when a plurality of types of clamps are used, and to provide a drive source for other clamps. It is an object of the present invention to provide a metal pipe processing method and apparatus that do not need to be newly provided.

  In order to achieve the above object, according to the present invention, a part of the pipe is clamped from the outside in the radial direction by the first clamp, and the other part of the pipe is reduced or expanded by the first punch that moves in the axial direction of the pipe. After forming the first processed portion by making a diameter, the first processed portion is clamped from the radially outer side by the second clamp, and the first processed by the second punch that moves in the axial direction of the pipe In the metal pipe processing method in which the second processed portion is formed by reducing or expanding the diameter of at least another part of the portion, the second clamp is provided on the first clamp so as to be movable in the radial direction of the pipe. A second punch that moves in the axial direction of the pipe is brought into contact with the clamp and the second clamp is moved inward in the radial direction of the pipe, whereby the first processed portion of the pipe is clamped by the second clamp. I am doing so.

  Further, in order to achieve the above object, the present invention achieves the above-described object by reducing the diameter of the other part of the pipe by moving the first clamp that clamps a part of the pipe from the outside in the radial direction and the axial direction of the pipe. A first punch that forms a first processed portion, a second clamp that clamps a part of the first processed portion from the outside in the radial direction, and a first processing by moving in the axial direction of the pipe In a metal pipe processing apparatus comprising a second punch for forming a second processed part by reducing or expanding at least a part of the other part of the part, the second clamp is piped to the first clamp And a first abutting portion on which the second punch abuts on the second clamp, and the second punch has a shaft on the first abutting portion of the second clamp. Second to move the second clamp radially inward by abutting in the direction The contact portion is provided.

  In the present invention, the second clamp that moves in the axial direction of the pipe contacts the second clamp that is movably provided on the first clamp, so that the second clamp moves radially inward. Since the first processed portion is clamped, the second processed portion can be formed without changing the pipe to another clamp after the pipe is clamped by the first clamp to form the first processed portion. It becomes possible. In this case, since the second clamp is driven by the moving force of the second punch, it is not necessary to newly provide a dedicated drive source for driving the second clamp.

  According to the present invention, after the pipe is clamped by the first clamp and the first processed portion is formed, the second processed portion can be formed without changing the pipe to another clamp. Pipes can be processed. In addition, since it is not necessary to newly provide a dedicated drive source for driving the second clamp, the existing processing apparatus can be used without modifying or replacing the processing apparatus, and the equipment cost is increased. There is an advantage that there is no.

  1 to 5 show an embodiment of the present invention. FIG. 1 is a perspective view of a main part of a pipe processing apparatus, FIG. 2 is an exploded perspective view of first and second clamps, and FIG. 3 is a pipe processing. FIG. 4 is a side view showing a process example of the pipe, and FIG. 5 is a side view showing another process example of the pipe.

  The pipe processing apparatus includes two first clamps 10 that sandwich a part of the pipe 1 from the radially outer side, four second clamps 20 that sandwich another part of the pipe 1 from the radially outer side, The first punch 30 for reducing the diameter of a part of the pipe 1 and the second punch 40 for expanding the diameter of a part of the reduced diameter part of the pipe 1 are provided. It is for manufacturing a base.

  Each first clamp 10 is made of a block-shaped member that faces the pipe 1 in the radial direction, and a semicircular clamp section 11 that sandwiches the pipe 1 is provided on the surface facing the pipe 1. . A plurality of engagement grooves 12 for movably engaging the second clamp 20 are provided on one end surface of the first clamp 10, and each engagement groove 12 extends radially outward of the pipe 1 from the clamp portion 11. It is formed to extend. Further, a cover plate 13 that covers a part of the engaging groove 12 is attached to one end surface of the first clamp 10, and each cover plate 13 has a semicircular opening 14 centered on the clamp portion 11. Each is provided.

  Each of the second clamps 20 is formed of a block-like member arranged in the circumferential direction of the pipe 1, and a curved clamp portion 21 that sandwiches the pipe 1 is provided on a surface facing the pipe 1. In this case, tapered surfaces 22 and 23 are provided on the one end side and the other end side in the axial direction of the clamp portion 21 so as to expand toward the radially outer side of the pipe 1. A first abutting portion 24 with which the second punch 40 abuts in the axial direction is provided on one end side of the second clamp 20, and the first abutting portion 24 is inclined with respect to the axial direction of the pipe 1. It consists of an inclined surface. Further, an engagement portion 25 that is slidably engaged with the engagement groove 12 of the first clamp 10 is provided on the other end side of the second clamp 20, and the engagement portion 25 is provided on the second clamp 20. It is formed to extend longer toward the radially outer side of the pipe 1 than from one end side. In this case, a spring 26 that urges the second clamp 20 outward in the radial direction of the pipe 1 is provided between the engagement portion 25 and the engagement groove 12. The spring 26 is disposed in a notch 25a provided in the engaging portion 25, and is engaged with one end of the engaging portion 12a provided in the engaging groove 12 and the notch 25a. Instead of the notch 25a, a groove that can accommodate the spring 26 may be provided.

  The first punch 30 is provided with a punch portion 31 extending in a cylindrical shape in the axial direction of the pipe 1 on one end side, and the punch portion 31 has a predetermined inner diameter smaller than the outer diameter of the pipe 1 before processing, A tapered surface 32 is provided on the inner peripheral surface of the tip portion so as to expand outward in the radial direction.

  The second punch 40 is provided with a punch portion 41 extending in a cylindrical shape in the axial direction of the pipe 1 on one end side, and the inner peripheral surface of the tip portion of the punch portion 41 has an inner diameter of the punch portion 31 of the first punch 30. A tapered surface 42 is provided so as to expand radially outward so as to be larger than the inner diameter. In addition, a second contact portion 43 that contacts the first contact portion 24 of each second clamp 20 is provided at one end of the second punch 40, and the second contact portion 43 is a punch portion. It is formed in a cylindrical shape protruding from the tip of 41. In this case, the inner peripheral surface of the distal end portion of the second contact portion 43 is formed in a tapered shape that spreads outward in the radial direction.

  Next, a method for processing the pipe 1 using the pipe processing apparatus configured as described above will be described. First, as shown in FIG. 3 (a), a part of the pipe 1 is clamped by the first clamp 10 from the outside in the radial direction, and the pipe 1 is pivoted while moving the first punch 30 to the first clamp 10 side. Pressurize in the direction. As a result, the pipe 1 is press-fitted into the punch portion 31 having an inner diameter smaller than the outer diameter thereof, and the first processed portion 1a having a reduced diameter so as to have the same outer diameter as the punch portion 31 is formed. At this time, since each second clamp 20 is positioned on the radially outer side of the pipe 1 by the spring 26, the movement of the punch portion 31 of the first punch 30 is not hindered by the second clamp 20. Next, when the first punch 30 is extracted from the pipe 1 and the second punch 40 is moved to the first clamp 10 side as shown in FIG. The contact portion 43 comes into contact with the first contact portion 24 of each second clamp 20, and each second clamp 20 is pressed by the axial pressing of the second punch 40 and the inclination of the first contact portion 24. It moves to the inside in the radial direction of the pipe 1. As a result, as shown in FIG. 3 (c), a part of the first processed portion 1a of the pipe 1 is sandwiched between the second clamps 20, and the punch portion of the second punch 40 is attached to the tip of the pipe 1. The inner end of 41 abuts in the axial direction. At that time, the pipe 1 is pressurized in the axial direction by the second punch 40, and the other part of the first processed portion 1 a is in the tapered surfaces 22 and 42 of the second clamp 20 and the second punch 40. A second processed portion 1b is formed which is intruded and expanded in diameter so that the outer diameter is larger than that of the first processed portion 1a. Thus, as shown in FIG. 4, a pipe base having tapered first and second processed portions 1 a and 1 b at two axial positions of the pipe 1 is formed.

  As described above, according to the present embodiment, the first clamp 10 moves in the axial direction of the pipe 1 to the first abutting portion 24 of the second clamp 20 provided to be movable in the radial direction of the pipe 1. By bringing the second contact portion 43 of the second punch 40 to contact into contact with each other, the second clamp 20 is moved inward in the radial direction, and a part of the first processed portion 1a is sandwiched from outside in the radial direction. Since the second processed portion 1b is formed by the second punch 40, the pipe 1 is clamped by the first clamp 10 to form the first processed portion 1a, and then the pipe 1 is clamped by another clamp. The second processed portion 1b can be formed without changing to, and the pipe 1 can be processed efficiently. In this case, since the second clamp 20 is driven by the moving force of the second punch 40, there is no need to newly provide a dedicated drive source for driving the second clamp 20, and the machining apparatus is modified. Existing processing equipment can be used without replacement.

  Each second clamp 20 is urged radially outward of the pipe 1 by the spring 26 and moved to a position where it does not interfere with the first punch 30, and the first contact portion 24 of the second clamp 20. When the second abutting portion 43 of the second punch 40 comes into contact with the second punch 40, the second clamp 20 is moved radially inward of the pipe 1 by being guided by the inclination of the first abutting portion 24. Therefore, the second clamp 20 can be reliably interlocked only with the operation of the second punch 40. This eliminates the need for any clamping work on the clamp side and is extremely advantageous for improving productivity.

  In the above embodiment, the second processed portion 1b is formed at a predetermined distance from the tip of the pipe 1. However, as shown in FIG. You may make it form the 2nd process part 1c. Moreover, in the said embodiment, although what formed the taper-shaped 2nd process part 1b was shown, as shown in FIG.5 (b), the diameter expanded so that a corner | angular part might become curvilinear. Two processed portions 1d may be formed.

The principal part perspective view of the pipe processing apparatus which shows one Embodiment of this invention. Exploded perspective view of first and second clamps Side cross-sectional view showing the pipe machining process Side view showing an example of pipe processing Side view showing another processing example of pipe Side cross-sectional view showing the conventional pipe machining process

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Pipe, 1a ... 1st process part, 1b, 1c, 1d ... 2nd process part, 10 ... 1st clamp, 20 ... 2nd clamp, 24 ... 1st contact part, 26 ... Spring 30 ... 1st punch, 40 ... 2nd punch, 43 ... 2nd contact part.

Claims (3)

A part of the pipe is sandwiched from the outside in the radial direction by the first clamp, and the first processed part is formed by reducing or expanding the other part of the pipe by the first punch that moves in the axial direction of the pipe. Thereafter, a part of the first processed part is sandwiched from the outside in the radial direction by the second clamp, and at least another part of the first processed part is reduced in diameter by the second punch that moves in the axial direction of the pipe. In the metal pipe processing method for expanding the diameter to form the second processed portion,
A second punch that moves in the axial direction of the pipe is brought into contact with a second clamp that is provided in the first clamp so as to be movable in the radial direction of the pipe, so that the second clamp is brought into the radial inner side of the pipe. A metal pipe processing method, characterized in that the first processed portion of the pipe is clamped by the second clamp by being moved. A first clamp that clamps a part of the pipe from the outside in the radial direction, and a first processed part that forms the first processed part by reducing or expanding the other part of the pipe by moving in the axial direction of the pipe. A punch, a second clamp that clamps a part of the first processed part from the outside in the radial direction, and a diameter or diameter expansion of at least another part of the first processed part by moving in the axial direction of the pipe In a metal pipe processing apparatus comprising a second punch for forming a second processed portion,
The second clamp is provided on the first clamp so as to be movable in the radial direction of the pipe, and a first abutting portion on which the second punch abuts on the second clamp is provided,
The second punch is provided with a second contact portion that axially contacts the first contact portion of the second clamp and moves the second clamp radially inward. Pipe processing equipment. The metal pipe processing apparatus according to claim 2, further comprising a spring that urges the second clamp outward in the radial direction of the pipe and moves the second clamp to a position where the second clamp does not interfere with the first punch.

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