JP2005186161A - Pipe holding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe holding device which improves yield of piping material, automates the pipe holding work and also can perform a tool change in a short period of time. <P>SOLUTION: The pipe holding device is provided with an inner diameter collet 8 and an outer diameter collet 7 to sandwich the end of a pipe, and pushing means 25, 75, and 76 which narrow the space between the inner diameter collet 8 and the outer diameter collet 7 by pressing the collet 8 and the collet 7 respectively. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a pipe material gripping device, and more particularly to a pipe material gripping device for gripping an end pipe of a pipe when a long steel pipe (pipe) is plastically processed into a tapered steel pipe in a heated atmosphere.

FIG. 15 shows a pipe material gripping device for gripping an end pipe of a pipe when a conventional long steel pipe (pipe) is plastically processed into a tapered steel pipe in a heated atmosphere.
The pipe material gripping devices 50A and 50B are arranged at the respective spindle tips of the tension side rotation mechanism base T1 and the drive side rotation mechanism base T2 (hereinafter simply referred to as “rotation mechanism base T”), and drive the motor M and the like. The pipe material W, which is a workpiece, is fitted into the mandrel 54 rotated by the means, the pin 51 is inserted into the pin insertion hole drilled at the tip of the mandrel 54, and the pin 51 falls off during rotation. The pipe material W is gripped by fixing a pin drop prevention ring 52 for preventing the pin 52 by a fixing means such as a bolt 53.

The gripped pipe material W drives both rotation mechanism bases T1 and T2 in the same direction by a synchronous drive control mechanism (not shown), applies tension to the pipe material W by the tension side rotation mechanism base T1, and drives the drive side. The rotating mechanism base T2 shifts to the left side of the example (see FIG. 15A) while braking.
The pipe material W is heated to several hundred degrees Celsius by the heater h in the heating device H, drawn by a drawing roller R provided in a known drawing device S, and a tapered steel pipe is manufactured (for example, patent document). 1).

However, the pipe material gripping devices 50A and 50B need to be manually performed by an operator when the pipe material W is attached to the rotation mechanism base T, and particularly when the pipe material gripping devices 50A and 50B are attached to the tension side rotation mechanism base T1. In addition to poor yield and long cycle time due to manual installation, the pipe material W has a different diameter and cannot be heated. There is a problem that it takes a long time to change the set-up time when machining the material.
JP 2002-192225 A

  In view of the problems of the conventional pipe material gripping device, the present invention provides a pipe material gripping device capable of automating the pipe gripping operation, improving the yield of the pipe material, and performing setup change in a short time. The purpose is to do.

  In order to achieve the above object, the pipe material gripping apparatus of the present invention includes an inner diameter gripping body that clamps a pipe end of a pipe and an outer diameter gripping body, and presses the inner diameter gripping body and the outer diameter gripping body, respectively. A pressing means for narrowing the interval between the inner diameter gripping body and the outer diameter gripping body is provided.

  In this case, the pressing means can be configured to press the inner diameter gripping body and the outer diameter gripping body individually.

  Further, in this case, the pressing means can be configured such that one of the inner diameter gripping body and the outer diameter gripping body is pressed and the other is followed and pressed.

  In this case, a detection mechanism for detecting the entrance of the pipe can be provided, and the pressing means can be operated by an application signal of the detection mechanism.

  Further, in this case, the pressing means can have a divided structure that can be contacted and separated by a joining member having a relay push rod.

  In this case, the inner diameter gripping body and / or the outer diameter gripping body can also be configured by being divided in the circumferential direction.

  Further, in this case, the inner diameter gripping body and the outer diameter gripping body can be bottomed cylindrical collets, and an elastic member can be interposed between the bottoms of the fitted collets.

  In the pipe material gripping device of the second invention, a pressure receiving member sliding with a fixed cap is juxtaposed inside a cylindrical collet whose outer peripheral surfaces on both sides in the axial direction are contact surfaces to the inner surface of the pipe material. A collet return ring for pulling back the moved collet is provided on the pressure receiving member, and a pressing means for sliding the pressure receiving member and the collet return ring is provided.

  According to the pipe material gripping apparatus of the present invention, the pipe material can be automatically gripped, and since there is no human intervention, the pipe material can be gripped while performing the heating operation, and the pipe material is gripped with a high material yield. An apparatus can be provided.

  In addition, since an elastic member is provided between the inner diameter gripping body and the outer diameter gripping body and sequentially pressed, the pipe material can be pressed evenly from inside and outside to exert a large gripping force.

  Furthermore, when the pressing member has a three-divided structure that can be contacted and separated by a joint member having a relay push rod, it is possible to easily and speedily change the setup when processing pipes having different material diameters.

  Furthermore, when the inner diameter gripping body and / or the outer diameter gripping body is divided and configured in the circumferential direction, when the gripping claw is consumed due to wear or the like, only the consumed portion can be replaced.

  Further, according to the second invention, it is possible to improve the yield of the pipe material and to provide a pipe material gripping device at a low cost.

  Embodiments of a pipe material gripping device of the present invention will be described below with reference to the drawings.

1 to 4 show a first embodiment of a pipe material gripping device of the present invention.
This pipe material gripping device 1 is a fixing means such as a bolt B at the tip of a main shaft 5A (see FIG. 1) of a tension side rotating mechanism base T1 of a tapered steel pipe manufacturing apparatus that plastically processes a long steel pipe into a tapered steel pipe in a heated atmosphere. In the bottomed cylindrical casing 2, an outer diameter collet 7 (an outer diameter gripping body as defined in claim 1) and an inner diameter collet 8 (referred to in claim 1). The inner diameter gripping body.) Is provided, and is connected to the tip of the pressing means 25 such as a hydraulic cylinder. By pressing the outer diameter collet 7 and the inner diameter collet 8, a force for clamping the pipe material W from both the inner circumference and the outer circumference is obtained. It consists of the main components of the pressing member 26 to transmit.

  Although the casing 2 is shown in FIG. 1 as being divided into two parts, it may of course be composed of one piece. The inner peripheral surface of the front lid 3 and the outer peripheral surface of the cap 4 are formed at an angle equal to the inclined surfaces of the outer diameter collet 7 and the inner diameter collet 8, and the space between the collets 7 and 8 is narrowed by the pressing force of the pressing means 25. W is configured to be firmly held.

The elastic member 9 made of a wave spring or the like and the spacer 10 are positioned between the inner bottom surface 7a of the outer diameter collet 7 and the outer bottom surface 8a of the inner diameter collet 8, and the pressing force from the pressing means 25 is sequentially applied to both the collets 7, 8. The other of the third aspect of the present invention is configured to follow and be pressed (sequentially pressed).
By deploying the elastic member 9, the inner and outer diameter collets are pressed evenly even if there is a variation in the thickness of the pipe material W to be gripped and variations in the inner and outer diameter dimensions (manufacturing errors). Power can be output.
In addition, it is not restricted to the wave spring of a present Example, As shown in FIG. 7, it may consist of the hydraulic cylinder Cy and hydraulic accumulator Ac which were connected with the pipe line.

Further, as shown in FIG. 8, a bent portion M is formed at the bottom of the bottomed cylindrical outer diameter collet 7 and / or the inner diameter collet 8, or a bottomed cylindrical outer diameter collet as shown in FIG. 7 and / or the flexible part J may be formed in the body part of the inner diameter collet 8.
R shown in FIG. 8 represents a collet return ring, and F shown in FIG. 9 represents a collet return flange.

  The pressing member 26 has its distance regulated by the distance collar 12a and is connected to the pressure receiving member 11 by a fixing means such as a bolt, a pressing member 26b fixed to the tip of the pressing means 25, and both pressing members 26a and 26b are joined and inserted at the time of the setup change, and are composed of a joint member 26c that allows the pressing members 26a and 26b to be brought into contact with and separated from each other by being pulled out.

Reference numeral 20 denotes a pipe material detection mechanism, and a detection member 21 that abuts when an end pipe of the pipe material W enters, and the detection member 21 is normally biased to the outside (right side in FIG. 1) of the pipe material gripping device 1. It comprises an urging means 24 made of a spring and the like, and a push rod 22 for limit switch that is disposed through the rotational axis of the pipe material gripping device 1.
The limit switch push rod 22 is divided into three push rods 22a and 22b built in the pressing member 26 and a relay push rod 22c built in the joint member 26c.
This is because the pipe material gripping device 1 and the inside of the main shaft 5A (the main shaft 5A, the pressing means 25, and the pressing member 26b) are separated from each other at the time of a setup change described later.
Reference numeral 13 denotes a shaft that is fixed to the center of the bottom surface of the casing 2 and that fixes the cap 4 with a fixing means such as a nut. The shaft 13 has a hole slightly larger than the outer diameter of the push rod 22 to allow the push rod 22 to be inserted. As shown in the figure, there is no problem even if it is an integral structure in addition to being screwed to the center of the bottom surface of the casing 2 as shown in the figure.
6 is a stopper that regulates the entry limit of the pipe material W.

In the above configuration, the roller R of the drawing device S shown in FIG. 15A is expanded, the pipe material gripping device 1 is inserted into the drawing device S, and is kept waiting in the vicinity of the heating device H.
Next, the tip of the pipe material W (molding start side end) was passed between the inner peripheral surface of the upper lid 3 and the outer peripheral surface of the cap 4 through the heating device H and passed through the pipe material gripping device 1 (see FIG. 1). It is made to enter between the collets of the outer diameter collet 7 and the inner diameter collet 8.

The pipe end (tip) of the pipe material W comes into contact with the detection member 21 of the pipe material detection mechanism 20 and further advances to overcome the urging force of the urging means 24 so that the push rod 22 is moved inside the pipe material gripping device 1. Proceed to.
When the push rod 22 advances by a predetermined amount, the limit switch 4 (not shown) is operated, and the pressing means 25 is operated in response to the application signal.

  By the operation of the pressing means 25, the pressing member 26 advances to the right in FIG. 1, and the pressure receiving member 11 connected with its distance regulated by the distance collar 12a also shifts to the right.

  Next, as the pressure receiving member 11 moves in the right direction, the outer diameter collet 7 in contact with the pressure receiving member 11 is pressed, the tip of the outer diameter collet 7 also advances in the right direction, and the inner bottom surface 7a of the outer diameter collet 7 The tip of the inner diameter collet 8 also advances in the right direction through the elastic member 9 and the spacer 10 arranged between the outer bottom surfaces 8a of the inner diameter collet 8. The positional relationship between the outer diameter collet 7 and the inner diameter collet 8 before operation is such that the tip of the inner diameter collet 8 protrudes from the outer diameter collet 7 by the pushing action of the elastic member 9.

  Progress is stopped when the tip of the inner diameter collet 8 comes into contact with the cap 4, but the outer diameter collet 7 is continuously pressed and advanced rightward so that the tip of the outer diameter collet 7 is brought into contact with the inner peripheral surface of the upper lid 3. The space between the collets 7 and 8 is narrowed by the wedge action, and the pipe material W is firmly held.

After that, when the pipe material gripping device 1 that grips the pipe end is withdrawn from the drawing device S, the drawing roller is provided in the drawing device S while applying tension to the pipe material W and rotating the drive as in the conventional example. Drawing is performed with R, and a tapered steel pipe is completed.
At this time, since the pipe material gripping device 1 according to the present invention does not require a manual operation for gripping the pipe material W, the pipe material W is operated by operating the heater h when the pipe material W passes the heating device H at the time of attachment. When the tip of the pipe material W passes through the heating device H, that is, is gripped in the drawing device S, the unformed length (cut-off length) of the end of the pipe material W Can be greatly improved as compared with the prior art, and the yield can be improved.

  Next, after the processing is completed, the pressing force of the pressing means 25 is released, and the pipe material W sandwiched between the outer diameter collet 7 and the inner diameter collet 8 is removed.

  At the end of processing, the pressing means 25 is moved to the left side of the figure by an appropriate application signal, and the head of the pull-back rod 12c, which is connected to the pressure receiving member 11 with the distance defined by the distance collar 12b, is an annular shape of the inner diameter collet 8. It is engaged with the inner bottom surface b and pulled back to shift to the left side.

  As the inner diameter collet 8 moves to the left side, the outer diameter collet 7 is also moved to the left side through the spacer 10 and the elastic member 9 disposed between the inner bottom surface 7a of the outer diameter collet 7 and the outer bottom surface 8a of the inner diameter collet 8. The tips of both collets 7 and 8 are separated from the inner peripheral surface of the front lid 3 and the outer peripheral surface of the cap 4, and the end pipe of the pipe material W is released.

  Next, a procedure for setting up the pipe material gripping apparatus 1 when processing pipe materials W having different diameters will be described.

  The pipe material gripping device 1 is replaced by removing the fixing means B such as a bolt that connects the casing 2 and the main shaft 5A, and sliding the joint member 26c that joins the pressing members 26a and 26b together with the relay push rod 22c. Thus, the outer diameter collet 7, the inner diameter collet 8 and the like provided in the casing 2 and the pressing member 26a are integrally removed (see FIG. 3).

k is an abacus ball-shaped space, so that even if the relay push rod 22c is displaced at the time of setup change, it is possible to prevent the joint member 26c from being pulled out, and the relay push rod 22c and push rod 22a, Even if there is a slight misalignment or misalignment between 22b and the rod, transmission between the rods is ensured.
Reference numeral 27 denotes a passage for taking in and out the joint member 26c, and 28 denotes a lid in which a stopper member 29 for preventing the joint member 26c from falling off is formed on the inner surface (see FIG. 1).

As a modification of the positional relationship between the outer diameter collet 7 and the inner diameter collet 8, as shown in FIG. 4, the elastic member 9 and the spacer 10 are positioned between the outer bottom surface 7 b of the outer diameter collet 7 and the inner bottom surface 8 b of the inner diameter collet 8. Alternatively, as shown in FIG. 10, it may be positioned between the outer bottom surface 7 b of the outer diameter collet 7 and the pressure receiving member 11.
The outer diameter collet 7 shown in FIGS. 4 (a) and 4 (b) is used in place of the pull-back rod 12c of the first embodiment in which the clamping force between the collets 7 and 8 is released by pulling back the pressing means 25 shown in FIG. The outer diameter collet 7 is pulled back by a connecting bar 30 having a long hole 31 into which a pin P provided on the outer peripheral surface of the pin P is slidably fitted. Subsequently, the spacer 10 and the elastic member 9 receive the pulling force. The collet 8 also returns to the initial state.

Next, the pipe material gripping device 40 shown in FIG. 5 will be described.
This is because the load applied to the drive-side rotation mechanism base T2 is about 5 tons compared to the load applied to the tension-side rotation mechanism base T1 of about 20 tons, and the clamping force as much as that of the pipe material gripping device 1 described above is obtained. In view of unnecessary points, the structure is simpler than the pipe material gripping device 1, and the shaft 35 is arranged on the main shaft 5B so as to be the same axis as the rotation shaft of the main shaft 5B by fixing means B such as a bolt. The bottom plate 31 is attached. A cap 37 having an inclined surface whose side surface corresponds to the inclination of the inner peripheral surface of the front collet portion 33a of the collet 33 is fixed to the distal end side of the shaft 35, and the rear side collet portion 33b of the collet 33 on the proximal end side. A pressure receiving member 36 having an inclined surface corresponding to the inclination of the inner peripheral surface is slidably provided. The tip of the rod 38 protruding from the pressing member 26 a is in contact with the pressure receiving member 36.

  As shown in FIGS. 5 and 6A, the collet 33 has a cylindrical structure in which the circumferential direction is divided by the slits S (in the example shown in the figure, three divisions), and there are two outer peripheral portions on both sides except for the central portion of the cylindrical body. The pipe material W is a contact portion to the inner surface, and the inner peripheral side of these contact portions is an inclined surface corresponding to the inclined surfaces of the pressure receiving member 36 and the cap 37. As shown in FIG. 6 (b), the collet return ring 34 has protrusions 34 a and 34 a formed on the outer periphery, and the protrusion 34 a is disposed in the slit S of the collet 33 and is positioned between the pressure receiving member 36 and the cap 37. And connected to the rod 38. (See FIG. 5).

  Reference numeral 32 denotes a material contact for restricting the entry of the pipe material W into the end pipe.

In the above configuration, in an initial state in which the pipe material W is not gripped, the pressure receiving member 36 is on the main shaft 5B side, and the distance from the cap 37 is large, so that the outer diameter of the collet 33 is also small.
In this state, the drive-side rotation mechanism base T2 is caused to travel so that the pipe material W enters the material contact 32 and stops at that position.
Thereafter, tension is applied to the pipe material W by the tension side rotation mechanism base T1.
When the pipe material W comes to this approach position, the pressure receiving member 36 is moved to the cap 37 side via the pressing member 26 and the rod 38 by receiving the application signal and moving the pressing means 25 to the left side in the figure. When the collet 33 receives a wedge action from the pressure receiving member 36 and the cap 37, its outer diameter increases.

Thereby, the pipe material W is fixed so that the collet 33 bites into the pipe material W from the inside.
Further, when the pipe material W is applied with a tension toward the left side of the figure, the collet 33 is further expanded by receiving the wedge action from the cap 37 and can firmly fix the pipe material W.

Next, when releasing the fixation of the pipe material W, the pressure receiving member 36 and the collet return ring 34 are moved to the right side by moving the pressing means 25 to the right side in the figure.
As a result, the pressing member 36 is displaced with respect to the rear side collet portion 33b, and the outer diameter of the rear side collet portion 33b itself becomes smaller due to the diameter reducing action of the rear side collet portion 33b, and the fixing of the pipe material W is released. After the protrusion 34a of the collet return ring 34 abuts the end of the slit S, when the collet return ring 34 further moves to the right side, the front collet portion 33a is pulled out from between the pipe material W and the cap 37, so that the pipe material W is released. .

Next, the pipe material gripping device 70 shown in FIGS. 11 to 14 will be described.
This pipe material gripping device 70 is configured to press the outer diameter gripping body 73 and the inner diameter gripping body 74 by individual pressing means 75 and 76. As in the first embodiment, it is attached to the tip end (not shown) of the tension side rotation mechanism base T1 with a load of about 20 tons by a fixing means such as a bolt and grips the pipe. Gripping body 73 and inner diameter gripping body 74, pressing means 75 and 76 for pressing the respective gripping bodies, outer diameter holder 71 for regulating outer diameter gripping body 73 from the outside, and inner diameter holder 72 for regulating inner diameter gripping body 74 from the inside. And consists of the main components.

The outer diameter gripping body 73 includes a claw 73 a on the inner surface of the tip, a tip outer surface 73 b is formed as an inclined surface, and a joint 77 connected to the tip of the pressing member 75, and a plurality of erected from the joint 77. The connecting column 79a and a pedestal 80 connected to the tip of the connecting column 79a are disposed so as to be able to advance and retreat in the axial direction, and move relative to the pedestal 80 in the direction perpendicular to the axial direction of the pipe material (radial direction). Installed as possible. A spring case 80b for providing a spring 80a for biasing the outer diameter gripping body 73 toward the head inclined surface 71a side of the outer diameter holder 71 disposed outside is disposed at the tip of the base 80.
Further, the outer diameter gripping body 73 can be an integral product having a bottomed cylindrical shape and having a notch portion in the axial direction as in the first embodiment, and can be divided into a plurality of parts in the circumferential direction. In this embodiment, as shown in FIG. 12, an example is shown in which it is divided into six in the circumferential direction. In the outer diameter holder 71, a hole 71c is drilled at a position located between the adjacent outer diameter gripping bodies 73 in order to remove the fixing bolts of the claws 74a when replacing the claws 74a of the inner diameter gripping body 74 described later, The claw 74a of the inner diameter gripping body 74 can be exchanged. During operation, the pin 83 is fitted into the hole 71c so as to protrude slightly from the inner surface, which is the inclined surface of the outer diameter holder 71, so that the rotation of the outer diameter gripping body 73 in the circumferential direction is restricted. The pin 83 is fixed from the end face side of the outer diameter holder 71 by fixing means such as a bolt.

The inner diameter gripping body 74 includes a claw holder 74b at its tip and a claw 74a that can be brought into contact with and separated from the outer surface of the claw holder 74b. 78, a face plate 81 for projecting the connecting column 79b to the joint 78, and a slide 82 connected to the tip of the connecting column 79b projecting from the face plate 81 so as to be movable back and forth in the axial direction. At the same time, it is attached to the slide 82 so as to be movable in the direction perpendicular to the axial direction (radial direction). On the slide 82, a spring 82 a that presses the inner surface 74 c of the inner diameter gripping body 74 against a frustoconical inner diameter chuck guide 72 a disposed at the tip of the inner diameter holder 72 disposed inside the inner diameter gripping body 74 is pressed. A spring retainer 82b is provided.
In addition, the inner diameter gripping body 74 is also configured to be divided into a plurality of parts in the circumferential direction in addition to using an integral product having a bottomed cylindrical shape and having a notch portion in the axial direction as in the first embodiment. In this embodiment, as shown in FIG.

The inner diameter holder 72 extends from a disc-shaped bottom plate 72b and a central portion of the bottom plate, and a shaft portion into which a base 80 to which the outer diameter gripping body 73 is attached and a slide 82 to which the inner diameter gripping body 74 is attached is slidably fitted. 72c and the above-mentioned inner diameter chuck guide 72a attached to the tip of the shaft portion 72c by a fixing means such as a bolt. The bottom plate 72b and the shaft portion 72c do not need to be integrated, and the shaft portion 72c may be fixed to the center of the bottom plate 72b with a bolt or the like.
In the bottom plate 72b, holes for passing through the connecting columns 79a and 79b for connecting the joint 77 and the base 80 and the face plate 81 and the slide 82, respectively, are drilled according to the position of the connecting column 79.
Further, the bottom plate 72b is fixed to a connecting pipe 84 which is rotatably attached to the main shaft side via a bearing or the like by fixing means such as a bolt. The connecting pipe 84 is formed with a plurality of notches 84a provided in the circumferential direction, and the outer diameter holder 71 described above is attached to the outer periphery of the bottom plate 72b from the notches 84a by fixing means such as bolts. By removing the outer diameter holder 71 from the bottom plate 72b, it is possible to replace the outer diameter gripping body 73 whose claw portion is worn. The cutout portion 84a is always covered with a lid member 84b.

Next, the joints 77 and 78 that connect the outer diameter gripping body 73 and the inner diameter gripping body 74 will be described.
The joints 77 and 78 are divided when the setup is changed, and are connected by an outer diameter joint 85 and an inner diameter joint 86.
The joint 78 includes a front part 78a and a rear part 78b, and a T-shaped notch is formed in each of the front part 78a and the rear part 78b, so that the front part 78a and the rear part 78b are combined with each other to face each other. A notch 78c of the mold is formed, and the cylindrical material is cut out in the shape of an oval as shown in FIG. 14, and is connected by an inner diameter joint 86 having a groove 86a that fits into the H-shaped notch 78c. .
The joint 77 has a hollow shape that allows passage of the joint 78 therein, and includes a front portion 77a and a rear portion 77b. Like the joint 78, the front portion 77a and the rear portion 77b are respectively formed with T-shaped notches. An H-shaped notch 77c is formed in a portion facing the front portion 77a and the rear portion 77b, the notch portions 85b and 85b having the same shape as the hollow portion of the joint 77, and the H-shaped notch. They are connected by a pair of outer diameter joints 85-1 and 85-2 in which a groove 85 a that fits into the portion 77 c is formed.

  As shown in FIG. 13, the inner diameter joint 86 is held by a pair of outer diameter joints 85-1 and 85-2 and the fitting state is maintained. A flat cover 87 fixed to the connecting pipe 84 is disposed at the outer ends of the outer diameter joints 85-1 and 85-2, and the outer diameter joints 85-1 and 85-are rotated when the gripping device 70 is rotated. 2 and the joint 77 can be slid when the pressing means 75 is operated.

  The pressing means 75 and 76 for moving the joint 77 connected to the outer diameter gripping body 73 and the joint 78 connected to the inner diameter gripping body 74 in the axial direction are pressing devices (not shown) disposed at the tip of the main shaft by a rotary joint or the like. The configuration is not particularly limited, and may be hydraulic or electric.

In the above configuration, the roller R of the drawing device S shown in FIG. 15A is expanded, the pipe material gripping device 70 is inserted into the drawing device S, and is kept waiting in the vicinity of the heating device H.
Next, after the rear end (pipe forming end side end) of the pipe material W is gripped using any of the pipe material gripping devices 1, 40, 70 provided on the driving side rotation mechanism base T2, the front end (pipe forming) The heating device H is passed from the start side end), and the drive side rotation mechanism base T2 is advanced toward the pipe material gripping device 70 (see FIG. 11).
At this time, a servo motor is used to advance the drive-side rotation mechanism base T2 that holds the pipe, and the distance traveled is determined by a pulse generator or the like, and a phototube such as a phototube that detects the pipe end position is detected by the pipe material W receiving device. By deploying a position detector, processing the pipe end position signal, pipe length signal, and travel distance signal with a controller such as a sequencer, and driving the servo motor with the controller output signal to advance the pipe material W The tip of the pipe can be advanced to an appropriate position between the gripping bodies of the outer diameter gripping body 73 and the inner diameter gripping body 74 disposed at the tip of the pipe material gripping device 70.

  When the pipe material W enters a proper position between the gripping bodies of the outer diameter gripping body 73 and the inner diameter gripping body 74, the outer diameter gripping body 73 is operated by operating the pressing means 75, 76 in the direction of the arrow (see FIG. 11). As in the first embodiment, the inner diameter gripping body 74 is narrowed by the wedge action and firmly holds the pipe material W.

After that, when the pipe material gripping device 70 that grips the pipe end is withdrawn from the drawing processing device S, the drawing roller provided in the drawing processing device S is applied with tension to the pipe material W and rotated as in the conventional example. Drawing is performed with R, and a tapered steel pipe is completed.
At this time, since the pipe material gripping device 70 according to the present invention does not require a manual operation for gripping the pipe material W, the pipe material W is operated by operating the heater h when the pipe material W passes the heating device H at the time of attachment. When the tip of the pipe material W passes through the heating device H, that is, is gripped in the drawing device S, the unformed length (cut-off length) of the end of the pipe material W Is the same as that of the first embodiment in that it can be greatly improved as compared with the prior art and the yield can be improved.

  Next, a procedure for changing the setup of the pipe material gripping apparatus 70 when processing pipe materials W having different diameters will be described.

In order to replace the pipe material gripping device 70, the cover 87 is removed from the connecting pipe 84, the outer diameter joint 85 is slid and removed from the notch 77c of the joint 77, and then the inner diameter joint 86 is removed from the notch of the joint 78. The joint 77a and the joint 77b and the joint 78a and the joint 78b are separated by being slid and removed from the joint 78c.
As a result, the outer diameter gripping body 73 and the inner diameter gripping body 74 can be removed for each outer diameter holder 71 and replaced with a pipe material gripping device provided with a different diameter gripping body.

In the case of the pipe material gripping device 1 of the first embodiment, the pipe material gripping device of the drive side rotation mechanism base T2 can be used in combination with the conventional pipe material gripping device 50B shown in FIG. In the pipe material gripping device 40 (see FIG. 5) of the embodiment, the pipe material gripping device 40 is inserted into the pipe material W and can enter the heating device H while the pipe end of the pipe material W is gripped. it can.
Therefore, when the pipe material gripping device 1 of the first embodiment and the pipe material gripping device 40 of the second embodiment are used in combination, it is very effective for shortening the unformed length at both ends of the pipe material W. is there.

  In the pipe material gripping device 40 of the second embodiment, the wedge inclined surface between the front collet portion 33a and the cap 37 is steep (about 10 ° from the horizontal line), and the space between the rear collet portion 33b and the pressure receiving member 36 is increased. If the wedge inclined surface has a gentle slope (about 5 ° from the horizontal line), it is effective for equalizing the pipe gripping force by the collets 33a and 33b in a state where tension is applied to the pipe material W.

  In the pipe material gripping device 70 (see FIGS. 11 to 14) of the third embodiment, when the collet is divided and configured, the collet claw portion consumed due to wear or the like can be easily replaced.

  As mentioned above, although the pipe material holding | gripping apparatus of this invention was demonstrated based on several Example, this invention is not limited to the structure described in the said Example, The structure described in each Example is combined suitably. The configuration can be changed as appropriate without departing from the spirit of the invention.

  Since the pipe material gripping device of the present invention has a characteristic that it can automatically and easily grip a pipe material, it can be used for a device that plastically processes a long steel pipe into a tapered steel pipe. For example, it can also be used for a use as a chucking device of a device for bending a pipe material.

It is a front view of the partial cross section of the pipe material holding | gripping apparatus of this invention. It is XX sectional drawing in FIG. FIG. 2 is a YY cross-sectional view with a part cut away in FIG. 1. Another example of attachment of a collet is shown, (a) is a partial cross-sectional front view, and (b) is a ZZ arrow view of FIG. It is a front view of the partial cross section of another Example of the pipe material holding | gripping apparatus of this invention. (A) is a perspective view which shows the external appearance of the collet of 2nd invention, (b) is a figure which shows a collet return ring, and is a VV arrow line view of FIG. It is a partial cross section figure which shows another Example of an elastic member. It is a front view of the partial cross section which shows another Example of an elastic member. It is a front view of the partial cross section which shows another Example of an elastic member. It is a partial cross section figure which shows the modification of arrangement | positioning of an elastic member and a spacer. It is a front view of the partial cross section of another Example of the pipe material holding | gripping apparatus of this invention. It is a side view of another Example of the pipe material holding | gripping apparatus of this invention. (A) is X1-X1 sectional drawing in FIG. 11, (b) is Y1-Y1 sectional drawing of Fig.13 (a). It is a perspective view which shows the external appearance of an outer diameter coupling and an inner diameter coupling. (A) is an overall view of a tapered steel pipe manufacturing apparatus equipped with a pipe material gripping device, and (b) is a partial cross-sectional front view of a conventional pipe material gripping device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pipe material gripping device 5A Main shaft 5B Main shaft 7 Outer diameter collet 8 Inner diameter collet 9 Elastic member 20 Detection mechanism 25 Pressing means 26 Pressing member 40 Pipe material gripping device 70 Pipe material gripping device

Claims (8)

  A pressing means that includes an inner diameter gripping body and an outer diameter gripping body that sandwich the pipe end of the pipe, and presses the inner diameter gripping body and the outer diameter gripping body to reduce the interval between the inner diameter gripping body and the outer diameter gripping body. A pipe material gripping device comprising the pipe material gripping device.   2. The pipe material gripping device according to claim 1, wherein the pressing means is configured to press the inner diameter gripping body and the outer diameter gripping body individually.   2. The pipe material gripping device according to claim 1, wherein the pressing means is configured such that when one of the inner diameter gripping body and the outer diameter gripping body is pressed, the other is followed and pressed.   4. A pipe material gripping device according to claim 1, further comprising a detection mechanism for detecting the entry of a pipe, wherein the pressing means is operated by an application signal of the detection mechanism.   5. The pipe material gripping device according to claim 1, wherein the pressing means has a split structure that can be contacted and separated by a joining member having a relay push rod or an inner diameter joint and an outer diameter joint.   6. A pipe material gripping device according to claim 1, wherein the inner diameter gripping body and / or the outer diameter gripping body is divided in the circumferential direction.   The inner diameter gripping body and the outer diameter gripping body are cylindrical collets with bottoms, and an elastic member is interposed between the bottoms of both collets fitted to each other. Or the pipe material holding apparatus of 6.   A pressure receiving member that slides with a fixed cap is placed inside a cylindrical collet whose outer peripheral surfaces on both axial sides are contact surfaces to the inner surface of the pipe material, and the collet return ring that pulls back the moved collet is disposed on the pressure receiving member. And a pressing means for sliding the pressure receiving member and the collet return ring.

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