JP2011121084A - Tubular material jointer and tubular material joining method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tubular material jointer and a tubular material joining method by which the joining force in a joined part is secured. <P>SOLUTION: This jointer is provided with: an inner punch 21 having a diameter-reduced part 24 which is formed by reducing the diameter of one end of the side, which is inserted into the inner periphery of a first member 11; a hollow part 26 which penetrates the inner punch 21 in the axial direction; a wedge-shaped projecting part 25 which is projected on the outer peripheral face of the diameter-reduced part 24; and a core material 28 in which the hollow part 26 is slid freely movably forward and backward in the axial direction and which expands the diameter of the diameter-reduced part 24 when sliding it on the side of the diameter-reduced part 24. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention belongs to the technical field of a pipe material joining device and a pipe material joining method.

  As this type of technology, the technology described in Patent Document 1 below is disclosed. In this publication, one end of a metal pipe is inserted into the mounting hole of the metal flange, and the metal pipe is radially expanded from the inner diameter side by the core inserted into the metal pipe, so that the metal flange and the metal It joins a pipe made of steel. Moreover, what provided the convex part in the lower part of the core is disclosed.

JP-A-11-138224

In the above prior art, since the metal flange and the diameter-enlarged portion of the metal pipe are in contact with each other, there is a possibility that a sufficient joining force cannot be ensured. Further, a convex portion is provided at the lower portion of the core, and the diameter of the open end portion of the metal pipe is increased at the flat portion on the side surface of the convex portion. For this reason, the metal flange and the metal pipe are in contact with each other at the enlarged diameter portion, so that the metal pipe is easily detached.
The present invention has been made paying attention to the above-mentioned problems, and an object thereof is to provide a pipe material joining device and a pipe material joining method capable of ensuring the joining force of the joining portion.

  In order to achieve the above object, in the first invention, an inner punch having a reduced diameter portion formed by reducing the diameter of one end of the first member inserted into the inner periphery, and the inner punch penetrates in the axial direction. Hollow portion, wedge-shaped convex portion projecting on the outer peripheral surface of the reduced diameter portion, and sliding the hollow portion so as to advance and retreat in the axial direction, and expanding the reduced diameter portion when sliding toward the reduced diameter portion side. And a core material to be made.

  In the second invention, the liquid tank pipe provided integrally with the capacitor is formed from the first member and the second member, and the first member is inserted into the inner periphery of the second member. On the other hand, the first member and the second member are joined by expanding a part of the first member into a wedge shape.

  Therefore, in this invention, it becomes possible to ensure the retention strength of a junction part.

1 is an overall view of a heat exchanger of Example 1. FIG. 1 is a cross-sectional view of a liquid tank of Example 1. FIG. It is a figure which shows the inner punch of the pipe material connector of Example 1. FIG. It is a figure which shows the core material of the pipe material connector of Example 1. FIG. It is a figure which shows the inner punch guide of the pipe material junction device of Example 1. FIG. It is a figure which shows the temporary assembly method of the 1st member of Example 1, and a 2nd member. It is a figure which shows the temporary assembly method of the 1st member of Example 1, and a closure member. It is a figure explaining the processing method of the inner punch of Example 1. FIG. It is a figure which shows the inner punch of the pipe material junction device of Example 2. FIG. It is a figure which shows the inner punch of the pipe material junction device of Example 3. FIG. It is a figure which shows the inner punch of the pipe material connector of another Example. It is a figure which shows the inner punch of the pipe material connector of another Example. It is a figure which shows the state which inserted the pipe material junction device in the inner periphery of the 1st member of another Example. It is a figure which shows the state which inserted the pipe material junction device in the inner periphery of the 1st member of another Example.

[Example 1]
〔overall structure〕
First, the overall configuration will be described.
FIG. 1 is an overall view of the heat exchanger 1. The heat exchanger 1 is disposed adjacent to each other along the tank 3 and a pair of tanks 2 and 3 disposed at a predetermined interval on the left and right sides, a condenser 4 disposed between the pair of tanks 2 and 3. A long liquid tank 5 is provided.

  The tank 2 is provided with an input connector 6 through which vaporized high-temperature refrigerant flows, and an output connector 7 through which low-temperature refrigerant liquefied in the condenser 4 and the liquid tank 5 flows out. The tank 3 is provided with holding members 8, 9, and 10 for holding the liquid tank. Of these, the holding members 8 and 9 communicate the inside of the tank 3 with the inside of the liquid tank 5. The refrigerant flowing in from the input connector 6 flows in the order of tank 2 → capacitor 4 → tank 3 → capacitor 4 → tank 2 → capacitor 4 → tank 3 → liquid tank 5 → tank 3 → capacitor 4 → tank 2 and output connector 7 Spill from.

[Configuration of liquid tank]
FIG. 2 is a cross-sectional view of the liquid tank 5. The liquid tank 5 includes a main body 13 composed of a substantially cylindrical first member 11 and a substantially cylindrical second member 12 connected to each other, and a substantially dish-shaped closing member that closes both ends of the opening of the main body 13. 14 and 15 and a filter 16 accommodated in the main body 13.

  The inner diameter of the second member 12 is formed to be slightly larger than the outer diameter of the first member 11, and is integrally formed by inserting one end of the first member 11 into one end of the second member 12.

  The outer peripheral side surface of the first member is fixed to the tank 3 via the holding member 10, and the outer peripheral side surface of the second member 12 is fixed to the tank 3 via the holding member 8 and the holding member 9. A filter 16 is fixed inside the second member 12 and between the holding member 8 and the holding member 9 in the axial direction.

  The closing member 14 is formed in a disc-like bottom portion 14a and an annular protrusion standing from the outer periphery of the bottom portion 14a, and is inserted into the inner periphery of the opening end portion 11a of the first member 11 so as to be fitted. A portion 14b is formed.

  The closing member 15 is formed in a disc-like bottom portion 15a and an annular protrusion standing from the outer periphery of the bottom portion 15a, and can be inserted into the inner periphery of the opening end portion 12a of the second member 12 so as to be fitted. A portion 15b is formed.

  The refrigerant flowing from the tank 3 into the liquid tank 5 is filtered by the filter 16 and returns to the tank 3 again. A gaseous refrigerant is stored in the upper part of the liquid tank 5, and a liquid refrigerant is stored in the lower part, and only the liquid refrigerant returns to the tank 3. That is, the liquid tank 5 has a reservoir function and a gas-liquid separation function.

[Configuration of pipe jointer]
Each component of the heat exchanger 1 is made of aluminum or an alloy mainly made of aluminum or stainless steel. Further, at least one of the contact portions where the respective members contact each other is formed of a brazing sheet, or a brazing material to which a flux is applied or pasted in advance is formed. The components of the heat exchanger 1 are temporarily assembled together and then fired in a furnace to be brazed.

  The liquid tank 5 needs to temporarily assemble the first member 11 and the second member 12, the first member 11 and the closing member 14, and the second member 12 and the closing member 15 together. Below, the pipe material connector 20 used when temporarily assembling the 1st member 11, the 2nd member 12, and the closure members 14 and 15 is demonstrated.

  FIGS. 3A and 3B are diagrams showing the inner punch 21 of the pipe joint 20, FIG. 3A is an axial side view of the inner punch 21, and FIG. 3B is a radial side view of the inner punch 21. The entire inner punch 21 is formed in a substantially cylindrical shape. The inner punch 21 includes an insertion portion 22 inserted into the tube, a large diameter portion 23 formed on one end side of the insertion portion 22 with a larger diameter than the insertion portion 22, and a circumferential direction on the other end side of the insertion portion 22. It has a reduced diameter portion 24 divided into eight.

  The reduced diameter portion 24 is reduced in diameter by bending as it goes toward the tip. Further, since the reduced diameter portion 24 is divided in the circumferential direction, the diameter can be increased by being pressed from the inner peripheral side to the outer peripheral side. Further, since the reduced diameter portion 24 is bent, it has a restoring force, and when the pressing force stops working, the diameter of the reduced diameter portion 24 is reduced again by the restoring force of the reduced diameter portion 24 itself. A wedge-shaped convex portion 25 is formed in the circumferential direction at the outer peripheral tip of the reduced diameter portion 24. A through hole 26 is formed in the inner punch 21 in the axial direction, and the convex portion 25 side of the through hole 26 is formed so as to reduce in diameter toward the tip, and a small diameter portion is formed in the vicinity of the convex portion 25 in the axial direction. 27 is formed. The wedge-shaped convex part 25 has a substantially triangular shape with a so-called cross-section, and has a substantially V-shape that tapers following the outer diameter direction of the inner punch 21.

FIG. 4 is a view showing the core material 28 of the pipe material connector 20. The core material 28 is formed so as to reduce in diameter toward one end side, and one end portion of the core material 28 is formed to have a larger diameter than the small diameter portion 27 of the inner punch 21.
When the core material 28 slides through the through hole 26 of the inner punch 21 toward the reduced diameter portion 24, one end of the core material 28 is inserted into the small diameter portion 27 of the inner punch 21, and the reduced diameter portion 24 is moved from the inner peripheral side. Press toward the outer periphery to expand the diameter. When the core material 28 slides through the through hole 26 of the inner punch 21 to the opposite side to the reduced diameter portion 24, the core material 28 is pulled out from the small diameter portion 27, and the reduced diameter portion 24 is reduced in diameter again.

  5A and 5B are views showing the inner punch guide 29 of the pipe material connector 20, FIG. 5A is an axial side view of the inner punch guide 29, and FIG. 5B is a radial side view of the inner punch guide 29. FIG. The inner circumference of the inner punch guide 29 is larger than the outer diameter of the insertion portion 22 of the inner punch 21, and the outer circumference of the inner punch guide 29 is formed larger than the larger diameter portion 23 of the inner punch 21. . Also, the axial thickness of the inner punch guide 29 is such that when the inner punch 21 is inserted into the first member 11 as shown in FIG. It is formed so that the convex part 25 is located.

[Temporary assembly method for liquid tank]
FIG. 6 is a diagram showing a temporary assembly method of the first member 11 and the second member 12. First, as shown in FIG. 6A, the core material 28 is inserted into the through hole 26 of the inner punch 21, and the inner punch 21 is inserted into the inner periphery of the inner punch guide 29. At this time, the core member 28 is inserted up to the small diameter portion 27 of the inner punch 21.

  Next, as shown in FIG. 6B, the pipe material connector 20 set as shown in FIG. 6A is inserted from the other end side of the first member 11. At this time, the inner punch guide 29 is locked to the first member 11, the large-diameter portion 23 of the inner punch 21 is locked to the inner punch guide 29, and the convex portion 25 is the first member 11 and the second member 12. It will be located in the junction part.

  Next, as shown in FIG. 6C, the core material 28 is advanced, and the leading end portion of the core material 28 is inserted into the small diameter portion 27 of the inner punch 21. At this time, the core member 28 increases the diameter of the reduced diameter portion 24 of the inner punch 21, and the convex portion 25 at the tip of the reduced diameter portion 24 increases the diameter of a part of the inner periphery of the first member 11. A protrusion formed by bulging on the outer peripheral side of 11 is buried and joined on the inner peripheral side of the second member 12.

  FIG. 7 is a diagram showing a temporary assembly method of the first member 11 and the closing member 14. First, as shown in FIG. 7A, the core material 28 is inserted into the through hole 26 of the inner punch 21, and the inner punch 21 is inserted into the inner periphery of the inner punch guide 29. At this time, the core member 28 is inserted up to the small diameter portion 27 of the inner punch 21.

  Next, as shown in FIG. 7B, the closing member 14 is opened to the opening end of the first member 11 in a state in which the tube material connector 20 set as shown in FIG. 7A is inserted into the opening of the closing member 14. Insert into part 11a.

Next, as shown in FIG. 7C, the core material 28 is advanced, and the tip end portion of the core material 28 is inserted into the small diameter portion 27 of the inner punch 21. At this time, the core material 28 expands the diameter-reduced portion 24 of the inner punch 21, and the convex portion 25 at the tip of the diameter-reduced portion 24 expands a part of the inner periphery of the insertion portion 14 b of the closing member 14. The first member 11 and the closing member 14 are joined.
The second member 12 and the closing member 15 are joined in the same manner as described above.

  In addition, between the 1st member 11 and the closure member 14, the closure member 14 is equivalent to the 1st member of this invention, and the 1st member 11 is equivalent to the 2nd member of this invention. In addition, between the second member 12 and the closing member 15, the closing member 15 corresponds to the first member of the present invention, and the second member corresponds to the second member of the present invention.

[Inner punch machining method]
FIG. 8 is a view for explaining a processing method of the inner punch 21. FIGS. 8A to 8D show an axial side view and a radial side view of each step. First, as shown in FIG. 8A, a hole is formed in a cylindrical member to form a through hole 26 and a small diameter portion 27.

Next, as shown in FIG. 8B, the outer periphery of the cylindrical member is machined by lathe machining. By this processing, the convex portion 25, the insertion portion 22 and the large diameter portion 23 are formed.
Next, as shown in FIG.8 (c), the edge part by the side of the convex part 25 is processed by a notch process (wire cut).
By this processing, the reduced diameter portion 24 is formed.
Next, as shown in FIG. 8D, after the reduced diameter portion 24 is reduced by bending, a quenching process is performed. The inner punch 21 is formed through these processes.

[Action]
At least one of the abutting joints of each member is formed of a brazing sheet, or a brazing material to which a flux is applied or pasted in advance is formed. Therefore, when the first member 11, the second member 12, and the closing members 14 and 15 are temporarily assembled, if the members are press-fit, the brazing material may be peeled off.

  Therefore, the outer diameter of the member (for example, the first member 11) disposed on the inner side is made smaller than the inner diameter of the member (for example, the second member 12) disposed on the outer side at the time of coupling, and the member disposed on the inner side is the outer side. It is conceivable that both members are joined by inserting into a member disposed in the middle and expanding the diameter of the member disposed inside. Thereby, both members can be joined without the brazing material peeling off. However, in normal diameter expansion joining, there is a possibility that the two members are in contact with each other and a sufficient joining force cannot be obtained.

  Therefore, in the first embodiment, the inner punch 21 having a reduced diameter portion 24 formed by reducing the diameter of one end inserted into the inner periphery of the first member 11, and the hollow portion 26 penetrating the inner punch 21 in the axial direction. The wedge-shaped convex part 25 protruding on the outer peripheral surface of the reduced diameter part 24 and the hollow part 26 are slidably movable in the axial direction, and when the reduced diameter part 24 is slid to the reduced diameter part 24 side, the reduced diameter part 24 is And a core material 28 for expanding the diameter.

  Therefore, since a part of the joint portion between the first member 11 and the second member 12 is enlarged by the convex portion 25, the joining force between the first member 11 and the second member 12 can be ensured. Similarly, the joining force between the first member 11 and the closing member 14 and the second member 12 and the closing member 15 can be secured. Moreover, peeling of the brazing material can be suppressed. Further, since the reduced diameter portion 24 is formed by reducing the diameter of one end of the inner punch 21, it is easy to insert the inner punch 21 into the first member and workability can be improved.

  Further, in Example 1, when the core material 28 slides on the opposite side to the reduced diameter portion 24, the enlarged reduced diameter portion 24 is reduced in diameter. Therefore, it is easy to remove the inner punch 21 from the first member 11 and the closing members 14 and 15 and workability can be improved.

In Example 1, the convex portion 25 is provided on the side surface of the end portion of the reduced diameter portion 24. Therefore, for example, when the inner punch 21 is inserted into a shallow member such as the closing members 14 and 15, the convex portion 25 can be inserted into the member, and the member can be enlarged by the convex portion 25. .
In Example 1, the reduced diameter portion 24 was quenched. Therefore, the strength of the reduced diameter portion 24 can be increased.

  In the first embodiment, the liquid tank 5 is provided integrally with the capacitor 4, and the pipe of the liquid tank is formed from the first member 11 and the second member 12. Therefore, the length of the liquid tank 5 can be adjusted according to the size of the capacitor 4.

  In Example 1, the reduced diameter portion 24 is divided into a plurality of portions in the circumferential direction. Therefore, the diameter-reduced portion 24 can be expanded smoothly. Further, since the convex portion 25 provided with the reduced diameter portion 24 is also divided in the circumferential direction, the brazing material can flow between the convex portions 25 divided at the time of brazing, and the bonding force after brazing can be increased. it can.

〔effect〕
The effects of Example 1 are listed below.

(1) With the second member 12 inserted into the outer periphery of the first member 11, the first member 11 and the second member 12 are expanded by enlarging a part of the first member 11 with respect to the second member 12. In the pipe material connector 20 to be joined, an inner punch 21 having a reduced diameter portion 24 formed by reducing the diameter of one end inserted into the inner periphery of the first member 11, and a hollow penetrating the inner punch 21 in the axial direction. The portion 26, the wedge-shaped convex portion 25 projecting on the outer peripheral surface of the reduced diameter portion 24, and the hollow portion 26 are slidably movable in the axial direction, and the reduced diameter portion is slid toward the reduced diameter portion 24 side. And a core member 28 that expands the diameter of 24.
Therefore, since a part of the joint portion between the first member 11 and the second member 12 is enlarged by the convex portion 25, the joining force between the first member 11 and the second member 12 can be ensured. Similarly, the bonding force between the first member 11 and the closing member 14 and the second member 12 and the closing member 15 can be secured. Moreover, peeling of the brazing material can be suppressed. Further, since the reduced diameter portion 24 is formed by reducing one end portion of the inner punch 21, the inner punch 21 can be easily inserted into the first member 11 and the closing members 14, 15 and workability can be improved.

(2) When the core material 28 slides to the opposite side of the reduced diameter portion 24, the enlarged reduced diameter portion 24 is reduced in diameter.
Therefore, it is easy to remove the inner punch 21 from the first member 11 and workability can be improved.

(3) The convex portion 25 is provided on the side surface of the end portion of the reduced diameter portion 24.
Therefore, when the inner punch 21 is inserted into a member having a shallow depth, the convex portion 25 can be inserted into the member, and the member can be enlarged by the convex portion 25.

(4) The reduced diameter portion 24 was quenched.
Therefore, the strength of the reduced diameter portion 24 can be increased, and the member can be easily enlarged.

(5) The pipe of the liquid tank 5 provided integrally with the capacitor 4 is formed from the first member 11 and the second member 12, and the second member 12 is inserted into the outer periphery of the first member 11. On the other hand, the first member 11 and the second member 12 are joined by expanding a part of the first member 11 into a wedge shape.
Therefore, since a part of the joint portion between the first member 11 and the second member 12 is enlarged by the convex portion 25, the joining force between the first member 11 and the second member 12 can be ensured. Similarly, the bonding force between the first member 11 and the closing member 14 and the second member 12 and the closing member 15 can be secured. Moreover, peeling of the brazing material can be suppressed. The length of the liquid tank 5 can be adjusted according to the size of the capacitor 4.

[Example 2]
Next, the pipe material connector 20 of Example 2 will be described. The same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted. In the pipe material connector 20 of the first embodiment, the convex portions 25 of the inner punch 21 are provided in a row. However, the pipe material connector 20 of the second embodiment is adjacent to the convex portion 25 of the inner punch 21 and is parallel to the second convex portion. The second embodiment is different from the first embodiment in that a plurality of portions 32 are provided in parallel.

  9A and 9B are views showing the inner punch 21 of the pipe material connector 20. FIG. 9A is a side view of the inner punch 21 in the axial direction, and FIG. 9B is a side view of the inner punch in the radial direction. As shown in FIG. 9, the second convex portion 32 is formed in parallel to the convex portion 25 on the side surface of the distal end portion of the reduced diameter portion. .

[Action]
In the pipe material connector 20 of Example 2, it arrange | positions orthogonally to a longitudinal direction with respect to the axial center of the inner punch 21, and forms the 2nd convex part 32 in parallel with the convex part 25 on the front-end | tip part side surface of a reduced diameter part. did. Therefore, the bonding force between the first member 11 and the second member 12 can be increased. Similarly, the bonding force between the first member 11 and the closing member 14 and the second member 12 and the closing member 15 can be increased.
In the second embodiment, an example in which the convex portion 25 and the second convex portion 32 are formed is shown, but a convex portion may be further formed in parallel with the second convex portion 32.

〔effect〕
The effect of Example 2 will be described below.

(6) Since the second convex portion 32 is formed in parallel with the convex portion 25 on the side surface of the distal end portion of the reduced diameter portion with respect to the axis of the inner punch 21, the first member 11. The bonding force between the second member 12 and the second member 12 can be increased. Similarly, the bonding force between the first member 11 and the closing member 14 and the second member 12 and the closing member 15 can be increased.

[Example 3]
Next, the pipe material connector 20 of Example 3 will be described. The same components as those in the first and second embodiments are denoted by the same reference numerals and the description thereof is omitted. Although the pipe material connector 20 of Examples 1 and 2 provided the convex part 25 of the inner punch 21 in the circumferential direction, the pipe material connector 20 of Example 3 provided the convex part 25 of the inner punch 21 in the longitudinal direction (axial direction). This is different from the first and second embodiments in that it is provided in FIG.

  10A and 10B are views showing the inner punch 21 of the pipe material connector 20. FIG. 10A is a side view of the inner punch 21 in the axial direction, and FIG. 10B is a side view of the inner punch in the radial direction. As shown in FIG. 10, a wedge-shaped convex portion 25 is formed long in the longitudinal direction of the inner punch 21 at the outer peripheral tip of the reduced diameter portion 24.

[Action]
In the pipe material connector 20 of Example 3, the convex part 25 was provided long in the longitudinal direction of the inner punch 21 at the outer peripheral tip of the reduced diameter part 24. Therefore, since the first member 11 is partially enlarged in the circumferential direction by the convex portion 25, the brazing material can flow between the convex portions 25 at the time of brazing, and the joining force after brazing can be increased. it can.

〔effect〕
The effect of Example 3 will be described below.

(7) The convex portion 25 of the inner punch 21 is arranged long in the longitudinal direction of the inner punch 21.
Therefore, since the first member 11 is partially enlarged in the circumferential direction by the convex portion 25, the brazing material can flow between the convex portions 25 at the time of brazing, and the joining force after brazing can be increased. it can.

[Other Examples]
As mentioned above, although the pipe material connector 20 of this invention was demonstrated based on the Example, the concrete structure of this invention is not limited to an Example, unless it deviates from the summary of the invention which concerns on each claim of a claim Design changes and additions are allowed.

11A and 11B are views showing the inner punch 21 of the pipe material connector 20. FIG. 11A is a side view in the axial direction of the inner punch 21, and FIG. 11B is a side view in the radial direction of the inner punch.
In the first to third embodiments, the reduced diameter portion 24 is divided into eight. However, as shown in FIG. 11, this reduced diameter portion 24 may be divided into four or the reduced diameter portion. The number of divisions of 24 is not particularly limited.

12A and 12B are views showing the inner punch 21 of the pipe material connector 20, FIG. 12A is a side view of the inner punch 21 in the axial direction, and FIG. 12B is a side view of the inner punch in the radial direction.
In the first to third embodiments, the entire inner punch 21 is formed in a substantially cylindrical shape. However, as shown in FIG. 12, the reduced diameter portion 24 and the insertion portion 22 may be formed in a substantially prismatic diameter. In addition, the cross section may be formed in an elliptical shape. Thereby, a square tube material and an elliptical square material can be joined.

FIG. 13 is a view showing a state in which the pipe material connector 20 is inserted into the inner periphery of the first member 11 in order to join the first member 11 and the second member 12.
In the first to third embodiments, the guide for guiding the first member 11 and the second member 12 is not provided. However, as shown in FIG. 13, a pipe guide 30 for guiding the first member 11 and the second member 12 is provided. You may make it provide.

  The pipe guide 30 has a through hole in the axial direction, and this through hole is formed so that the second member 12 can be inserted into the inner peripheral surface. When joining the first member 11 and the second member 12, the pipe guide 30 is disposed at the joint portion between the first member 11 and the second member 12, and the diameter-reduced portion 24 of the inner punch 21 is expanded. The pipe guide 30 can suppress deformation of the outer periphery of the second member 12.

FIG. 14 is a view showing a state in which the pipe material connector 20 is inserted into the inner periphery of the first member 11 in order to join the first member 11 and the second member 12.
Further, as shown in FIG. 14, a relief groove 31 may be formed in the pipe guide 30. When the first member 11 and the second member 12 are joined by pipe expansion, a relief portion of the member can be provided, the pipe expansion load can be reduced, and a joining force can be ensured.

4 Capacitor 5 Liquid tank 11 First member 12 Second member 14 Closure member (first member)
15 Closure member (first member)
20 Pipe material connector 21 Inner punch 24 Reduced diameter portion 25 Convex portion 32 Second convex portion

Claims (7)

In the state which inserted the 2nd member in the outer periphery of the 1st member, the pipe material connector which joins the 1st member and the 2nd member by expanding a part of the 1st member to the 2nd member In
An inner punch having a reduced diameter portion formed by reducing the diameter of one end of the first member inserted into the inner circumference;
A hollow portion passing through the inner punch in the axial direction;
The reduced diameter portion is divided in the circumferential direction,
A wedge-shaped convex portion protruding from the outer peripheral surface of the reduced diameter portion;
A core member that slides in the hollow portion so as to freely advance and retract in the axial direction, and expands the reduced diameter portion when sliding toward the reduced diameter portion side; and
The reduced diameter portion increases in diameter when pressed from the inner peripheral side to the outer peripheral side of the first member,
The reduced diameter portion is provided with a diameter reduction by its own restoring force unless it is pressed from the inner peripheral side to the outer peripheral side of the first member. In the pipe material connector according to claim 1,
When the core material slides to the opposite side of the reduced diameter portion, the enlarged diameter reduced portion is reduced in diameter. In the pipe material connector according to claim 1 or 2,
A tube material connector, wherein the convex portion is provided on an end side surface of the reduced diameter portion. In the pipe material junction device according to any one of claims 1 to 3,
The convex portion is provided on a side end side surface that is disposed perpendicular to the longitudinal direction with respect to the axial center of the inner punch and is inserted into the inner periphery of the first member of the reduced diameter portion, and the convex portion A tube material connector comprising a plurality of convex portions adjacent to the tube member. In the pipe material junction device according to any one of claims 1 to 3,
The tube material connector, wherein the convex portion is arranged long in the longitudinal direction of the inner punch. In the pipe material junction device according to any one of claims 1 to 5,
A pipe jointer characterized by quenching the reduced diameter portion. A liquid tank pipe provided integrally with the capacitor is formed from a first member and a second member,
With the outer periphery of the first member inserted into the second member, the first member and the second member are expanded by enlarging a part of the first member into a wedge shape with respect to the second member. Tube material joining method to join.

Images