JP5810415B2 - Heat treatment jig and heat treatment method for pipe material - Google Patents

Description

  The present invention relates to a heat treatment jig for connecting ends of pipe members when heat-treating a plurality of pipe materials, and a method of heat-treating a plurality of pipe materials using the heat treatment jig.

Conventionally, for example, the following Patent Documents 1 and 2 are known as methods for connecting and heat-treating a plurality of pipe materials.
In Patent Document 1, in continuous quenching in which pipe materials are sequentially abutted and transferred while being quenched by induction heating, a heat treatment jig is inserted into the inner periphery of the abutting portion of the pipe material, and the pipe material before and after the heat treatment jig is inserted. A continuous quenching method has been proposed in which a heat treatment jig is removed after connecting and transporting, and after heat-quenching. According to this method, it is possible to easily manufacture a quenched pipe material that is not bent or deformed.

  In Patent Document 2, in a continuous heat treatment apparatus in which a pipe material is connected and transferred by a heat treatment jig and induction heated, means for attaching the heat treatment jig to the tip of the pipe material before the heat treatment, and a pipe connected by the heat treatment jig There has been proposed a continuous heat treatment apparatus including means for induction heating while transferring a material, means for removing a heat treatment jig after heat treatment, and means for circulating the removed heat treatment jig. As a heat treatment jig, a hollow tube with an insertion part that is in watertight contact with the inner circumference of the pipe material on both sides and a circumferential groove for gripping the heat treatment jig and detecting the position in the middle part is used. doing. According to this continuous heat treatment apparatus, the heat treatment jig can be easily removed.

JP 2003-129128 A JP 2006-233303 A

  However, in the conventional heat treatment jig, the cooling liquid sometimes enters the inside of each pipe material from between the insertion portion of the heat treatment jig and the end portion of the pipe material during cooling after induction heating. When the coolant enters the inside of the pipe material, the temperature in each part of the pipe material varies during the rapid cooling, so that the heat treatment quality deteriorates.

  On the other hand, if the insertion of the heat treatment jig is sufficiently watertight between the insertion parts on both sides of the heat treatment jig and the end of each pipe material to prevent the intrusion of the coolant, the insertion part of the heat treatment jig is inserted into and removed from the end of each pipe material. When working, the workability was reduced, such as increased resistance. For this reason, there is a problem that it is impossible to achieve both the heat treatment quality and the improvement of workability.

  Therefore, the present invention can improve the workability of connecting and disconnecting each pipe material while preventing the coolant from entering the inside of each pipe material, and thereby heat treatment treatment that can achieve both heat treatment quality and workability improvement. An object of the present invention is to provide a pipe material heat treatment method capable of improving workability while ensuring heat treatment quality.

The heat treatment jig of the present invention that achieves the above object is a heat treatment jig for connecting ends of pipe materials when cooling a pipe material by induction heating while moving a plurality of pipe materials in the axial direction. There is a shaft portion extending in one axial direction, provided on one side of the shaft portion, and can be inserted into the first end of one pipe member, and provided on the other side of the shaft portion. A second insertion portion that can be inserted into the second end of the other pipe material, and a water stop wall disposed on the inner peripheral surface of each pipe material on the outer periphery of the first and second insertion portions, And a partition chamber partitioned on both sides in the axial direction by water walls.

In this heat treatment jig, it is preferable that a plurality of water blocking walls are provided apart from each other in the axial direction, and the partition chamber is continuously formed in an endless manner in the circumferential direction between adjacent water blocking walls. .
It is preferable that an isolation portion is provided between the first insertion portion and the second insertion portion of the shaft portion to be disposed between the end portions of each pipe material and to isolate the inside of each pipe material . It is preferable that the center of gravity is located closer to the first insertion portion on the upstream side in the moving direction of the pipe material than the isolation portion.

  The heat treatment method for a plurality of pipe members of the present invention that achieves the above object has insertion portions that can be inserted into end portions of the pipe material on both sides in the axial direction, and is disposed on the inner peripheral surface of the pipe member in each of the insertion portions. A heat treatment jig provided with a water stop wall and a partition chamber partitioned on both sides in the axial direction by the water stop wall, and a first end of one pipe member and a second end of the other pipe member In the state in which the insertion portion is inserted and both pipes are abutted and connected to each other, induction heating is performed and cooling is performed with the coolant.

  According to the present invention, a plurality of pipe materials can be connected by inserting and butting the first and second insertion portions of the heat treatment jig into the end portions of the pipe materials, and heat treatment can be performed in this state. At that time, since the first and second insertion portions are provided with water blocking walls arranged on the inner peripheral surface of each pipe material, a large amount of coolant enters the inside of the pipe material when contacting with the coolant. Can be prevented.

  Further, even if the coolant enters between the inner peripheral surface of the pipe material and the water stop wall, the coolant can be vaporized by the water stop wall and the pipe material in a high temperature state and discharged from the end portion. In addition, since the partition chamber is provided that is partitioned on both sides in the axial direction by the water blocking wall, excess cooling liquid enters between the inner peripheral surface and the water blocking wall, and between the inner peripheral surface and the water blocking wall. Even if it is not possible to evaporate, the coolant can be accommodated in the partition chamber and vaporized in this partition chamber.

  Therefore, it is possible to prevent the coolant from entering the inside of the pipe material and unevenly cooling each pipe material. Moreover, even if a clearance is provided between the inner peripheral surface of the pipe material and the water stop wall, the coolant can be prevented from entering the inside of the pipe material. It is possible to loosely fit to the inner peripheral surface of the pipe, and it is possible to improve workability of connecting and detaching each pipe member. Therefore, according to the present invention, it is possible to achieve both heat treatment quality and improved workability.

It is the schematic of the heat processing apparatus which heat-processes a some pipe material using the heat processing jig | tool of embodiment of this invention. It is a side view which shows the heat processing jig | tool in embodiment of this invention. It is a side view which shows the modification of the heat processing jig | tool in embodiment of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[Heat treatment equipment]
As shown in FIG. 1, the heat treatment apparatus 10 is an apparatus for connecting a plurality of pipe materials W by a heat treatment jig 20 and heat-treating them while moving them in the longitudinal direction. A heating section 13 that induction-heats the pipe material W by the heating coil 12, a cooling section 15 that cools the heated pipe material W by injecting a coolant from the annular jacket 14, and a pipe material W. And a discharge portion 16 for sequentially discharging and discharging.
The introduction part 11, the heating part 13, the cooling part 15 and the discharge part 16 are arranged along the axis of the heat treatment line, and each pipe material W is preset along the axis of the heat treatment line by a moving means (not shown). It moves at speed.

[Pipe material]
The plurality of pipe materials W to be heat-treated are made of a material such as steel that can be heated by induction, and the inner peripheral shape and the outer peripheral shape are preferably continuous in a constant shape in the axial direction. An elliptical shape, a polygonal shape, an irregular shape, or the like may be used, but here, an example of a pipe member having a circular cross section will be described.

[Heat treatment jig]
As shown in FIG. 2, the heat treatment jig 20 has a shaft portion extending in one axial direction, and a first insertion inserted into the first end portion W1 of the upstream pipe material W on both sides of the shaft portion. Part 21 and a second insertion part 22 inserted into the second end W2 of the pipe material W on the downstream side, between the first insertion part 21 and the second insertion part 22 of the shaft part , A separating portion 23 is provided between the end portions W1, W2 of both pipe materials W.
The first and second insertion portions 21 and 22 and the isolation portion 23 are integrally formed, and the central portion opens at the distal end of the first insertion portion 21 and the distal end of the second insertion portion 22 and penetrates in the axial direction. A through-hole 24 is provided.

  The material of the heat treatment jig 20 may be the same material as the pipe material W or a different material, but it is preferable to use a material that can be induction-heated such as a steel material. Since the heat treatment jig 20 itself can be heated when the pipe material W is induction-heated if it is a material that can be induction-heated, the coolant that has entered between the inner peripheral surface of the pipe material W is vaporized as described later. This makes it easy to prevent the coolant from entering the pipe material W.

  On the outer circumferences of the first and second insertion portions 21 and 22, there are water stop walls 25 that protrude in a ring shape from the shaft portion and are arranged on the inner peripheral surface of each pipe material W, and both axial sides are provided by the water stop walls 25. And partitioned compartments 26, respectively. Here, a plurality of water blocking walls 25 are provided apart from each other in the axial direction, and a partition chamber 26 is continuously formed between the adjacent water blocking walls 25 in an endless manner in the circumferential direction. Since each of the first and second insertion portions 21 and 22 is provided with three or more water blocking walls 25, the first and second insertion portions 21 and 22 have a plurality of partition chambers 26, respectively. .

The outer peripheral shape of each water blocking wall 25 is a similar shape or an approximate shape of the inner peripheral surface of each pipe material W, and is a size that can be loosely fitted to the inner peripheral surface of the pipe material W. It is preferable that a clearance is provided between the water blocking wall 25 and the inner peripheral surface of the pipe material W so that the first and second insertion portions 21 and 22 can be easily inserted into and removed from the pipe material W.
Here, the cross-sectional shapes of the plurality of water blocking walls 25 are made substantially the same so that the pipe material W can be stably attached to the inner peripheral surface.

  The thickness in the axial direction of each water blocking wall 25 is preferably thin, and the number of water blocking walls 25 and partition chambers 26 provided in the first and second insertion portions 21 and 22 can be appropriately increased. It should be noted that the water blocking wall 25 arranged on the innermost side of each pipe member W, that is, the water blocking wall 25 on the most distal end side of the first and second insertion portions 21 and 22 has an axial thickness other than that. It is formed thicker than the wall 25. As a result, when the coolant entering between the insertion portions 21 and 22 and the inner peripheral surface of the pipe member W is vaporized, the flow resistance to the inner side of the pipe member W is increased, and the end of each pipe member is increased. It is easy to discharge from the part to the outside.

  The water blocking wall 25 on the most distal end side of the second insertion portion 22 is formed in a tapered shape that becomes smaller toward the distal end side. With this shape, the second insertion portion 22 can be easily inserted into and removed from the second end portion of each pipe material W. In particular, when the pipe material W is removed from the second insertion portion 22 by the discharge portion 16, the second insertion portion 22 is removed. Can be prevented from being inadvertently detached from the first end portion W1.

The separating part 23 is disposed between the peripheral edge of the first end part W1 and the peripheral edges of the second end parts W1 and W2 of the connected pipe members W, thereby substantially closing the end opening of each pipe member W. Thus, the insides of both pipe materials W are isolated from each other. The outer peripheral shape of the separating portion 23 should not protrude outward from the outer peripheral surfaces of both pipe materials W, and is preferably a shape substantially corresponding to the outer peripheral shape of the pipe material W. On the outer periphery, a groove 27 is formed for the purpose of facilitating grasping of the isolation portion 23 when sandwiched between both pipe materials W.
The thickness of the isolation part 23 in the axial direction is set to the same thickness as the water blocking wall 25 because the center of gravity of the heat treatment jig 20 can be easily adjusted.

In this heat treatment jig 20, the axial length of the first insertion portion 21 and the axial length of the second insertion portion 22 are preferably shortened within a range where each pipe material W can be stably mounted. As the length is shorter, the influence of the heat treatment jig 20 on the temperature distribution in the vicinity of the end portion of each pipe material W when induction heating is performed by the heating unit 13 can be reduced.
Further, in the heat treatment jig 20, the axial length of the first insertion portion 21 is formed longer than the axial length of the second insertion portion 22, and the diameter of the through hole 24 on the distal end side of the second insertion portion 22 is further increased. By increasing the size, the center of gravity G of the heat treatment jig 20 is positioned closer to the first insertion portion 21 than the isolation portion 23. Although not particularly limited, if the position of the center of gravity G is set to a position separated from the separating portion 23 toward the first insertion portion 21, the first insertion portion 21 can be stably attached to the first portion of the pipe material W. It can be held at the end W1.

[Heat treatment method]
In order to heat-treat a plurality of pipe materials W using the heat treatment apparatus 10, the following is performed.
First, a heat treatment jig as described above is prepared in advance. And as shown in FIG. 1, in the introduction part 11, it arrange | positions in the state which inserted the 1st insertion part of the heat processing jig | tool 20 in the 1st end part W1 used as the movement direction front side of the pipe material W supplied. The heat treatment jig 20 is attached to the pipe material W.

  The pipe material W is arranged on the axis of the heat treatment line and pushed out with the first end W1 in front, whereby the second insertion portion 22 is inserted into the second end W2 of the pipe material W adjacent to the downstream side. . Thereby, the 1st end part of the upstream pipe material W introduced by the introduction part 11 and the 2nd end part W2 of the downstream pipe material W are faced | matched and connected.

  Then, the connection state is maintained by applying a driving force and moving the upstream pipe member W toward the downstream pipe member W by a moving means (not shown). In the heat treatment apparatus 10, the driving force is applied by the moving means and the connected state is maintained until the discharge unit 16 is reached via the heating unit 13 and the cooling unit 15.

Next, in the heating unit 13, each pipe material W is induction-heated in a short time to a desired temperature by the heating coil 12 while moving in the axial direction. After heating, a predetermined process is moved to maintain a high temperature for a predetermined time, and then the cooling unit 15 is passed.
In the cooling unit 15, the coolant is injected from the annular jacket 14 at a high pressure. Here, the coolant is sprayed obliquely toward the upstream side. As a result, the pipe material W is quenched and heat treatment such as quenching is performed. Thereafter, each pipe material W reaches the discharge part 16.

In the discharge unit 16, the downstream pipe material W is moved away from the upstream pipe material W. Accordingly, the second insertion portion 22 of the heat treatment jig 20 is extracted from the second end portion of the pipe material W on the downstream side. The heat treatment jig 20 is held in a state where the first insertion portion 21 is accommodated in the first end W1 on the upstream side.
Then, the pipe material W is detached from the axis of the heat treatment line, the heat treatment jig 20 is extracted from the first end W1 of the pipe material W, and the pipe material W after the heat treatment is discharged. On the other hand, the extracted heat treatment jig 20 is moved again to the introduction portion 11 and mounted again on the first end portion W1 of the pipe material W before the heat treatment.
By repeating such a process sequentially and sequentially on the plurality of pipe materials W, heat treatment of the plurality of pipe materials W is performed.

[Function and effect]
According to the heat treatment method using the heat treatment jig 20 as described above, the first and second insertion portions 21 and 22 of the heat treatment jig 20 are inserted into the end portions W1 and W2 of the pipe materials W and are brought into contact with each other. In this state, a plurality of pipe materials W can be connected and heat treatment can be performed in this state. At that time, since the first and second insertion portions 21 and 22 are provided with the water blocking walls 25 arranged on the inner peripheral surface of each pipe material W, when the coolant is brought into contact with each other, A large amount of coolant can be prevented from entering.

  Further, even if the coolant enters between the inner peripheral surface of the pipe material W and the water stop wall 25, the coolant is vaporized by the water stop wall 25 and the pipe material W in a high temperature state, and the end portions W1 and W2 Can be discharged. In addition, since the partition chamber 26 is provided that is partitioned on both sides in the axial direction by the water blocking wall 25, excessive cooling liquid enters between the inner peripheral surface and the water blocking wall 25 and the inner peripheral surface and the water blocking wall 25. Even if it cannot vaporize between the two, the cooling liquid can be accommodated in the partition chamber 26 and vaporized in the partition chamber 26.

  Therefore, it is possible to prevent the coolant from entering the inside of the pipe material W and cooling the pipe materials W unevenly. Further, even if a clearance is provided between the inner peripheral surface of the pipe material W and the water blocking wall 25, it is possible to prevent the coolant from entering the pipe material W. Accordingly, the water blocking walls 25 of the first and second insertion portions 21 and 22 can be loosely fitted to the inner peripheral surface of the pipe material W, and workability of connecting and detaching each pipe material W can be improved. Therefore, it is possible to achieve both heat treatment quality and workability improvement.

  According to this heat treatment jig, the partition chamber 26 is continuously formed endlessly in the circumferential direction. Therefore, the plurality of water blocking walls 25 can be completely isolated in each insertion portion, and the cooling liquid that cannot enter and evaporate from the ends W1, W2 of the pipe material W between the water blocking wall 25 and the inner peripheral surface is divided into the partition chambers. 26 can be reliably accommodated and evaporated. In particular, since a plurality of partition chambers 26 are formed, even if liquid coolant enters the inside of the pipe member W beyond a part of the partition chambers 26, it is accommodated in the partition chambers in multiple stages. Can be vaporized. Therefore, it is possible to reliably prevent the coolant from being directly introduced into the pipe material W from the gap between the inner peripheral surface and the water blocking wall 25.

  This heat treatment jig is disposed between the first insertion portion 21 and the second insertion portion 22 between the end portions W1 and W2 of both pipe materials W, and isolates the inside of both pipe materials W from each other. Therefore, the steam that has been vaporized and discharged from the inner peripheral surface of one pipe material W and the water blocking wall 25 is vaporized and discharged into the other pipe material W by the isolation part 23. You can prevent intrusion.

According to this heat treatment jig, since the center of gravity G is located closer to the first insertion portion 21 than the isolation portion 23, the first insertion portion 21 is inserted into the first end W1 of the pipe material W and the second insertion portion 22 is inserted. Is disposed in a state protruding from the first end W1, the heat treatment jig 20 can be easily held stably on the pipe material W. Therefore, the connection work of the plurality of pipe materials W can be easily performed.
In addition, when the connection of each pipe material W is sequentially released after the heat treatment, even if each pipe material W is detached from the second insertion portion 22, it is stably disposed on the other pipe material W by the first insertion portion 21. Therefore, it is difficult for the heat treatment jig 20 to fall, and the pipe material W can be easily detached.
Therefore, it is possible to improve the workability of the connecting work and the detaching work of the pipe material W when the multiple pipe materials W are sequentially heat treated.

In addition, the said embodiment can be suitably changed within the scope of the present invention.
In the said embodiment, although one form of the heat processing jig | tool 20 was shown, the shape of the heat processing jig | tool 20 can be changed suitably. For example, as shown in FIG. 3, the number of water blocking walls 25 of the first insertion portion 21 and the number of water blocking walls 25 of the second insertion portion 22 may be made different.
In the above, the center of gravity G of the heat treatment jig 20 is positioned closer to the first insertion part 21 than the isolation part 23 by making the first insertion part 21 longer than the second insertion part 22. , 22 may have the same length, and the center of gravity position may be adjusted, for example, by varying the thickness of the central axis portion.
In the above description, the example in which the plurality of water blocking walls 25 are provided and the partition chamber 26 that is endlessly continuous in the circumferential direction is formed between the water blocking walls 25 has been described. However, the water blocking wall 25 is formed to have a thick axial width. It is also possible to configure the partition chamber 26 of each insertion portion 21, 22 with a bottomed hole, a groove or the like.

W pipe material W1 first end portion W2 second end portion G center of gravity 10 heat treatment apparatus 11 introduction portion 12 heating coil 13 heating portion 14 jacket 15 cooling portion 16 discharge portion 20 heat treatment jig 21 first insertion portion 22 second insertion portion 23 Isolation part 24 Through hole 25 Water blocking wall 26 Partition chamber 27 Groove

Claims (5)

It is a heat treatment jig for connecting ends of pipe materials when cooling with a cooling liquid by induction heating while moving a plurality of pipe materials in the axial direction ,
A shaft portion extending in one axial direction, and a first insertion portion can be inserted into the first end portion of one is provided on the side one of the pipe of the shaft portion, the other pipe member provided on the other side of the shaft portion A second insertion part insertable into the second end of
The outer periphery of each of the first and second insertion portions is provided with a water stop wall disposed on the inner peripheral surface of each pipe member, and a partition chamber partitioned on both sides in the axial direction by the water stop wall, respectively. Heat treatment jig.   2. The heat treatment according to claim 1, wherein a plurality of the water blocking walls are provided apart from each other in the axial direction, and the partition chamber is continuously formed in an endless manner in the circumferential direction between the adjacent water blocking walls. jig. Between the first insertion portion and the second insertion portion of the shaft portion, an isolation portion is provided that is disposed between end portions of the pipe materials and isolates the insides of the pipe materials . The heat treatment jig according to claim 1 or 2. 4. The heat treatment jig according to claim 3 , wherein the center of gravity is located closer to the first insertion portion on the upstream side in the movement direction of the pipe material than the isolation portion. An insertion portion that can be inserted into an end portion of the pipe material is provided on both sides in the axial direction, a water blocking wall disposed on the inner peripheral surface of the pipe material in each of the insertion portions, and both sides in the axial direction by the water blocking wall. a compartment partitioned, the heat treatment jig having a prepared,
The insertion portion is inserted into the first end portion of one pipe material and the second end portion of the other pipe material. A cooling method for cooling pipe material.

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