JP4160571B2 - Long material gas pressure welding machine - Google Patents

Description

  The present invention relates to a long material gas pressure welding machine that clamps and butts a plurality of long materials (for example, two rails) and presses them while heating in this state.

  Conventionally, there has been proposed a long material gas pressure welding machine that clamps two rails and abuts the ends, and heats the ends with a gas burner to increase the load to press the two rails. (See Patent Document 1).

  As shown in FIG. 12, the long material gas pressure welding machine 100 in the above publication clamps a support frame 102 to which a pressurizing cylinder 101 is attached and one rail R1 that is in pressure contact (hereinafter, this rail is referred to as a fixed rail R1). The fixed frame 106 that receives the butt load and the other rail R2 to be pressed (hereinafter referred to as the moving rail R2) are clamped and the pressurizing cylinder 101 fixed to the casing of the long material gas pressure welding machine 100 A cylinder head is connected, and a moving frame 103 that moves forward and backward in accordance with the cylinder head is provided.

  Then, a plurality of guide shafts 107 are spanned between the support frame 102 and the fixed frame 106, and when the moving frame 103 is inserted into the guide shafts and the pressurizing cylinder 101 is driven, The moving frame is moved by being guided.

  In addition, a burner case 105 that supports a gas burner that is a heating source of the joining portion is installed between the fixed frame 106 and the moving frame 103 by a detachable method that covers the three guide shafts 107 from above.

  The fixed frame 106 and the moving frame 103 are formed in substantially the same structure, and include clamping cylinders 108 and 104 for clamping the fixed rail R1 and the moving rail R2, respectively.

  FIG. 13 is a front view of the fixed frame 106. The rail housing portion 112 formed at the substantially center, the chuck 113 fixed to the main body of the fixed frame 106, and the chuck fixed to the cylinder head of the clamping cylinder 108 are shown. The fixed rail R1 accommodated in the rail accommodating portion 112 is sandwiched between the chuck 113 and the chuck 111 by the force of the clamping cylinder 108, and is clamped.

In this way, the ends of the fixed rail R1 clamped to the fixed frame 106 and the rail R2 clamped to the moving frame 103 are butted together, and the butted portion is heated by a gas burner (not shown) in the burner case 105. A weight is applied to the moving frame 103 in the direction of the fixed frame 106 by the pressurizing cylinder 101 to press the fixed rail R1 and the moving rail R2.
JP 05-237669 A

  However, although the rail has twists, bends, dimensional variations, etc., the conventional chuck does not have a function corresponding to these characteristics, so it cannot be clamped sufficiently or the rail may be damaged. At the same time, there is a problem that the clamping force acts as a rotational force of the rail and the rails R1 and R2 are displaced at the pressure contact portion, which causes a problem of reducing the work efficiency of the pressure welding work.

  This will be described with reference to FIGS. Since the main purpose of the rail pressure contact is to suppress the reduction of sound when the train passes through the rail joint, the pressure contact ends of both the rails R1 and R2 are strictly aligned to perform the pressure contact.

  However, as described above, for example, when there is a twist (see FIG. 14), the conventional chuck structure cannot cope with this twist, and as shown in FIG. 15 (a), a gap S corresponding to the twist amount is generated. End up.

  Therefore, the clamping force acts on the moving rail R2 as a point load, and the moving rail R2 may be damaged or may not be sufficiently clamped.

  Further, as shown in FIG. 15B, the straight line L1 connecting the action points of the chuck 113 and the chuck 111 is deviated from the action line L2 of the clamping force, so that the clamping force acts as the rotational force ω of the moving rail R2. For this reason, the inconvenience that the position of the press contact end shifts occurs.

  In the past, in order to prevent such inconvenience, a shim K is packed in the gap S so that a uniform load acts on the rail. However, such work requires trial and error and experience, and pressure welding. The work efficiency of work will be reduced.

  Accordingly, an object of the present invention is to provide a long material gas pressure welding machine capable of efficiently performing high quality pressure welding without generating a gap even when the rail is slightly twisted. To do.

  In order to solve the above-described problem, the invention according to claim 1 is configured to clamp each long material by bringing a chuck into contact with both side portions in the vicinity of one end of each of the plurality of long materials, and end of each long material. In a long material gas pressure welding machine that presses a plurality of long materials by butting the parts and applying pressure while heating, the chuck that clamps one of the long materials is a pad that contacts both sides of the long material And a chuck body that supports the pad portion in a swingable manner so that the pad portion can swing in accordance with the twist of the long material.

  As a result, even if there is a twist or the like in the long material, the pad portion swings in response to the twist, so that the pad portion can be in contact with the side portion of the long material and effectively clamped. High-quality pressure welding can be performed efficiently.

  According to a second aspect of the present invention, the pad portion and the chuck body have arc surfaces having the same shape, and the arc surface of the pad portion slides in contact with the arc surface of the chuck body, and in the sliding direction. An engaging portion is provided on the pad portion along the chuck body, and an engaged portion that is loosely fitted to the engaging portion is provided on the chuck body, so that the pad portion and the chuck body are swingably engaged. And

  Since the pad part comes into contact with the chuck body and swings, the clamping force is uniformly transmitted to the pad part, so that the long material can be clamped with a uniform force and twisted into the long material. Even if there is, high-quality pressure welding can be performed efficiently.

The invention according to claim 3, the hardness of the engaged portion of at least the chuck body, characterized in that it is set to hardness by Redirecting a hearing hardness of the engaging portion of the pad portion.

  As a result, even when the chuck main body and the pad portion are engaged with each other, it is difficult for the engagement mechanism to generate warpage, and the reliability is improved.

  According to a fourth aspect of the present invention, there is provided a lubricant supply unit that supplies a lubricant that lubricates the arc surface of the pad portion and the chuck body and lubricates the engagement surface of the engaging portion and the engaged portion. It is characterized by that.

  This makes it possible to supply lubricant to the sliding surface, prevent galling and seizure, etc., and even if the long material is slightly twisted, the pad portion can be swung smoothly, so high-quality pressure welding is efficient. Will be able to do it.

  According to the present invention, the chuck that clamps one long material can swing freely so that the pad portion that abuts on both sides of the long material and the pad portion can swing according to the twist of the long material. Since it has a chuck body that supports the pad part, even if the long material is slightly twisted, there is no gap between the pad part and the side of the long material, which is effective High-quality pressure welding can be performed efficiently.

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side view of a long material gas pressure welding machine 1 according to the present invention. In addition, although a rail is used as an example of the long material in this embodiment, it will be added in advance that it may be used for joining other members.
The long material gas pressure welding machine 1 has an open end (end portion on the non-pressure welding side) of the moving rail R2 mounted thereon, the horizontal inclination of the moving rail R2 (linearity with the fixed rail R1), height, The small return device 5 that performs each adjustment of rotation, the fixed rail R1 and the moving rail R2 are clamped, and the pressure welding machine 6 that presses the moving rail R2 in the direction of the fixed rail R1 and press-contacts it, and the open end of the fixed rail R1 (non- The end portion on the pressure contact side) is mounted, and the fixed side end portion supporting device 7 for adjusting the height of the fixed rail R1 is a main component, and the small return device 5 and the pressure welding device 6 are laid on the pressure welding machine moving rail 8 It is designed to move up.

  FIG. 2 is a side view of the pressure welding machine 6, and FIG. 3 is a top view thereof. The pressure welding machine 6 includes a pressurizing cylinder 11, a support frame 12, a moving frame 13, an end grinding unit 14, a burner unit 15, a fixed frame 16, and a vertical adjustment unit 17, and includes a support frame 12 and a fixed frame 16. The movable frame 13, the end surface grinding portion 14, and the burner portion 15 are inserted into the upper and lower guide shafts 18 spanned between them so as to be movable along the guide shaft 18.

  The fixed frame 16 is fixed to the pressure welding machine casing 20 and clamps the vicinity of one end (near the pressure contact end) of the fixed rail R1. FIG. 4 is a front view of the fixed frame 16, in which the guide shaft 18 is fixed in the vicinity of the upper and lower four ends of the fixed frame main body 22, and a fixed rail receiving hole 23 for receiving the fixed rail R1 is formed in the approximate center. .

Fixed chuck holes 24 (24a, 24b) are formed horizontally on the left and right sides of the fixed rail receiving hole 23, and fixed chucks 25 (25a, 25b) are inserted into the fixed chuck holes 24, respectively.
The end surface of the fixed side chuck 25 is disposed so as to form a vertical surface, and a serrated surface is formed on the operating surface thereof so as to prevent the fixed rail R1 from slipping.

  The fixed side chuck 25 is connected to a fixed side cylinder head 27 (27a, 27b) of a fixed rail clamp cylinder 26 (26a, 26b) fixed to the fixed frame main body 22. The fixed side chuck 25 advances and retreats with the advance and retreat of 27.

  The left and right fixed rail clamping cylinders 26 are provided to operate independently. When clamping the fixed rail R1, for example, the right fixed rail clamping cylinder 26a in FIG. 4 is operated first. Then, the fixed chuck 25a connected to the fixed chuck 25a is stopped so that the working surface is at a predetermined position.

  When stopping the fixed rail clamp cylinder 26a, the flow path is sealed so that the flow of working fluid such as hydraulic oil does not occur. Therefore, when the fixed rail clamp cylinder 26a is stopped, the position of the fixed chuck 25a does not change even when an external force is applied.

Note that the working surface of the fixed side chuck 25a is a predetermined position at a position on the right side of the center of the fixed rail receiving hole 23 by a half of the thickness t of the leg column portion 28 of the fixed rail R1. When the contact is made, the preset center position of the press contact and the center position of the fixed rail R1 coincide with each other.
Of course, it can set suitably according to the thickness of the leg part 28 in the fixed rail R1 to press-contact.

  Next, the left fixed rail clamping cylinder 26b is operated to bring the fixed chuck 25b connected thereto into contact with the fixed rail R1. Since the right fixed rail clamping cylinder 26a is stopped, the contact force is a clamping force by the left and right fixed chucks 25a and 25b. As a result, the fixed rail R1 is clamped.

  As shown in FIG. 5, the moving frame 13 has a moving frame main body 31, a guide hole 32 through which the guide shaft 18 is inserted is formed in the vicinity of the upper and lower four ends thereof, and the moving rail R <b> 2 is accommodated in the approximate center. Rail receiving holes 33 are formed.

Moving side chuck holes 34 (34a, 34b) are formed horizontally on the left and right of the moving rail accommodation hole 33, and the moving side chucks 35 (35a, 35b) are inserted into the respective moving side chuck holes 34.
Similar to the fixed side chuck 25, the working surface of the moving side chuck 35 is provided with a serration so that it is difficult to slip when clamped.

  The moving side chuck 35 is connected to a moving side cylinder head 37 (37a, 37b) of a moving rail clamp cylinder 36 (36a, 36b) fixed to the moving frame main body 31, so that the moving side cylinder head is connected. The moving side chuck 35 advances and retreats as 37 advances and retreats.

  FIG. 10 is an exploded perspective view of the moving side chuck 35. The chuck main body 38 connected to the moving side cylinder head 37, the chuck rocking body 39 loosely contacting and contacting the chuck main body 38, and the chuck rocking body 39 are screwed. The chuck rocking body 39 and the pad 40 constitute a pad portion.

The side surface of the chuck main body 38 on the moving rail R2 side is formed as an arc surface (main body side oscillating surface) 42 having a predetermined radius of curvature, and an arcuate engaged portion is formed at a substantially central portion in the longitudinal direction. A recess 43 is formed.
In addition, a lubricant supply portion 41 is formed in the longitudinal direction of the arc surface 42 so as to be grooved and supply the lubricant to each sliding surface.

  A side surface on the chuck body 38 side of the chuck rocking body 39 is formed as an arcuate surface (oscillating body side rocking surface) 44 so as to be slidable in contact with the body-side rocking surface 42 of the chuck body 38. The convex part 45 which makes the circular arc-shaped engaging part loosely fitted in the concave part 43 of 38 is formed. Further, the other side surface of the chuck rocking body 39 is formed into a flat surface, and a plurality of female screw holes 48 are formed.

  In addition, although the recessed part 43 was provided in the chuck | zipper main body 38 and the convex part 45 was provided in the chuck rocking body 39, conversely, the convex part 45 may be provided in the chuck main body 38 and the recessed part 43 may be provided in the chuck rocking body 39. Needless to say.

  However, as shown in an enlarged view in FIG. 10, the shape of the concave portion 43 or the convex portion 45 is formed so that its cross-sectional shape is a trapezoidal shape. It is preferable that there is no configuration. This is to prevent natural separation while engaging the chuck body 38 and the chuck rocking body 39 with the concave portion 43 and the convex portion 45.

Further, it is preferable to change the hardness of at least the convex portion 45 and the concave portion 43 so that the convex portion 45 and the concave portion 43 do not come into contact with each other when the chuck rocking body 39 swings with respect to the chuck body 38. , it is preferable from the viewpoint of maintenance hardness of the recess 43 of the chuck body 38 to a value greater than the hardness of the convex portion 45 of the chuck oscillator 39.

  Various methods for changing the hardness are conceivable as described above. For example, even if the same material is used, a difference in hardness is generated due to the difference in quenching. The main body 38 may be formed.

  The pad 40 has a substantially rectangular flat plate shape, and a non-slip 46 is formed on the operating surface (the surface opposite to the chuck rocking body 39), and the pad 40 is screwed to the chuck rocking body 39. A screw hole 47 including a screw head receiving hole for receiving the through hole and the screw head at the time is formed.

  The left and right moving rail clamping cylinders 36 are provided to operate independently. When clamping the moving rail R2, for example, the right moving rail clamping cylinder 36a in FIG. Then, the moving surface of the moving side chuck 35a connected thereto is stopped so that the acting surface of the pad 40 is in a predetermined position.

  When the moving rail clamp cylinder 36a is stopped, the flow path is sealed so that the flow of working fluid such as hydraulic oil does not occur.

The working surface of the moving side chuck 35a is a predetermined position when the moving rail R2 is in contact with the working surface at a position on the right side of the center of the moving rail receiving hole 33 by half the thickness t of the leg column portion 28 of the moving rail R2. When the contact is made, the preset center position of the press contact and the center position of the moving rail R2 coincide with each other.
Of course, it can set suitably according to the thickness of the leg part 28 in the moving rail R2 to press-contact.

  Next, the left moving rail clamp cylinder 36b is operated to bring the moving chuck 35b connected thereto into contact with the moving rail R2. Since the right moving rail clamping cylinder 36a is stopped, the contact force becomes the clamping force by the left and right moving side chucks 35a and 35b. Thereby, the moving rail R2 is clamped.

  As shown in FIG. 3, two pressurizing cylinders 11 are provided so as to sandwich the moving rail R <b> 2, and each pressurizing cylinder 11 is fixed to the press-contacting machine housing 20, and the pressurizing cylinder head 71 is moved to a moving frame via a joint block 72. 13. Accordingly, when the pressurizing cylinder 11 advances and retreats, the moving frame 13 advances and retreats while being guided by the guide shaft 18 with respect to the press contact machine housing 20.

  The end surface grinding part 14 is provided on the front surface of the moving frame 13 on the fixed frame 13 side. The end grinding portion 14 is provided with a not-shown punch bite member so as to be detachable, and the surplus due to press contact is removed by removing the surplus.

  The burner portion 15 heats the press-contact end portion of the rail to a temperature lower than the melting point of the rail when press-contacting.

  Moreover, as shown in FIG. 1 etc., the up-down adjustment part 17 is provided between the support frame 12 and the moving frame 13, and the moving side up-down adjusting part which adjusts the height position of the pressure contact end part side in the moving rail R2. 17a and a fixed side vertical adjustment portion 17b which is provided adjacent to the fixed frame 16 and adjusts the height position on the pressure contact end portion side of the fixed rail R1.

  These vertical adjustment portions 17 can be adjusted so that the bottom surface of the rail has a desired height by turning the adjustment handle.

  The small return device 5 supports the open end (end portion on the non-pressure contact side) of the moving rail R2, and performs each adjustment of the inclination, height, and rotation of the moving rail R2 in the horizontal plane. The height adjustment unit 55 and the rotation adjustment unit 58 are included. 6 is a side view of the small turning device 5, FIG. 7 is a configuration diagram of the linearity adjusting unit 51, FIG. 8 is a configuration diagram of the height adjusting unit 55, and FIG. 9 is a configuration diagram of the rotation adjusting unit 58.

  As shown in FIG. 7, the linearity adjustment unit 51 includes a pair of left and right partitions 52 provided so as to sandwich the moving rail R <b> 2, and a moving mechanism 53 that horizontally moves the partitions 52, and handles the moving mechanism 53. When the screen 54 is turned, the partition 52 moves, and accordingly, the moving rail R2 tilts in a horizontal plane so that the linearity with the fixed rail R1 is adjusted.

  As shown in FIG. 8, the height adjustment unit 55 includes a roller 56 and a jack mechanism 57 that moves the roller 56 up and down. The height of the moving rail R2 riding on the roller 56 can be adjusted by changing the height of the roller 56 by a jack operation.

  As shown in FIG. 1, the rotation adjusting unit 58 includes a rail restricting member 59 and a jack mechanism 60. The rail regulating member 59 is a U-shaped member opened downward, and its end 61 (61a, 61b) is rotatably connected to the jack mechanism 60. Further, on the inner side of the rail regulating member 59, a bottom roller pair 62 on which the bottom surface of the moving rail R2 is placed, and a side roller pair 63 provided so as to be in contact with the side surface of the moving rail R2 are provided.

  For example, when the moving rail R2 is rotated counterclockwise (counterclockwise in FIG. 9), the jack mechanism 60 is operated to raise the right end 61a of the rail restricting member 59. As a result, the rail restricting member 59 rotates counterclockwise about the left end 61b, and the axis formed by the bottom roller pair 62 also rotates relative to the horizontal line. Since the moving rail R2 is placed on the bottom roller pair 62, the moving rail R2 also rotates following the rotation of the bottom roller pair 62.

  As shown in FIG. 1, the fixed-side end support device 7 includes a roller 65 and a jack mechanism 66, and places the bottom surface of the open end of the fixed rail R <b> 1 on the roller 65 to operate the jack mechanism 66. Thus, the height of the open end is adjusted.

  The rail pressure welding procedure in the long material gas pressure welding machine 1 having such a configuration will be described. First, a rail is placed on the fixed-side end support device 7 and the fixed-side vertical adjustment portion 17b by a crane or the like, and this is defined as a fixed rail R1. Similarly, a rail is mounted on the small return device 5 and the moving side vertical adjustment portion 17a, and this is referred to as a moving rail R2.

  Then, the moving side vertical adjustment unit 17a and the fixed side vertical adjustment unit 17b are adjusted to match the end surfaces of the fixed side rail R1 and the moving side rail R2.

  At this time, one fixed side chuck 25a (25b) in the fixed frame 16 is advanced and retracted to a predetermined position and stopped, and the vicinity of the joint end portion of the fixed side rail R1 is brought into contact with the fixed side chuck 25a (25b). Similarly, one moving side chuck 35a (35b) in the moving frame 13 is moved forward and backward to a predetermined position and stopped, and the moving side chuck 35a (35b) is brought into contact with the vicinity of the joint end of the moving rail R2.

  When the moving rail R2 is brought into contact with the moving side chuck 35a (35b), the chuck rocking body 39 of the moving side chuck 35a (35b) is swung so that the pad 40 comes into contact with the side of the moving rail R2. .

In this state, the fixed-side end support device 7 and the height adjustment unit 55 of the small turning device 5 are used to adjust the level of the fixed rail R1 and the moving rail R2, and the linearity adjusting unit 51 of the small turning device 5 is adjusted. The horizontal plane inclination is adjusted so that the moving rail R2 is positioned on the extension line of the fixed rail R1.
Furthermore, the moving rail R2 is rotated according to the twist of the moving rail R2 by the rotation adjusting unit 58 of the small turning device 5.
Thus, the alignment of the joining end of the fixed rail R1 and the moving rail R2 is completed.

  Note that the end face to be in pressure contact is not necessarily a flat surface, and does not necessarily form an orthogonal surface with respect to the length direction of the rail. Furthermore, the end face may be rusted. In such a case, it is preferable to adjust the alignment after the rail is supported by a temporary clamp mechanism (not shown) and the end face is adjusted by a grinder or the like.

  When the alignment of the end surface positions of the fixed rail R1 and the movable rail R2 is completed, the other fixed side chuck 25b (25a) of the fixed frame 16 is advanced and retracted to contact the fixed rail R1 to clamp the fixed rail R1. At the same time, the other moving side chuck 35b (35a) of the moving frame 13 is moved forward and backward to contact the moving rail R2 to clamp the moving rail R2.

  When the moving side chuck 35b (35a) contacts the moving rail R2, the chuck swinging body 39 of the moving side chuck 35b (35a) swings, and the pad 40 comes into contact with the side portion of the moving rail R2. .

  Accordingly, as shown in FIG. 11, even if the moving rail R1 is twisted, the moving rail R1 can be clamped with a uniform force, and can be clamped with a sufficient force, and the moving rail R1. Can be prevented from being scratched. Further, since the clamping force does not act as the rotational force of the moving rail R1, it is possible to prevent the positional deviation between the fixed rail R1 and the moving rail R2 at the press contact point.

  When the positioning and clamping of the fixed rail and the moving rail are completed in this way, the pressure contact portion is heated to the vicinity of the melting point by the burner unit 15 and the pressurizing cylinder 11 is operated to add the moving rail R2 to the fixed rail R1 side. Press. As a result, fusion occurs at the pressure contact surface and bonding is performed.

In consideration of ensuring that the press contact is generated on the entire end face, pressurization is performed until an extra space is appropriately generated in the press contact portion. Of course, such surplus is not necessary as a function of the rail, and is therefore removed by the end surface grinding section 14 after the press contact is completed.
Thereafter, in order to alleviate the uneven distribution of stress due to the pressure welding process or the like, a heat treatment is performed and cooled, and a series of pressure welding work is completed.

It is a side view of the long material gas pressure welding machine concerning the present invention. It is a side view of a pressure welding machine. It is a top view of a pressure welding machine. It is a front view of a fixed frame. It is a front view of a moving frame. It is a side view of a small return device. It is a front view of the linearity adjustment part in a small turning apparatus. It is a front view of the height adjustment part in a small turn device. It is a front view of the rotation adjustment part in a small turn device. It is a disassembled perspective view of a movement side chuck | zipper. It is a figure which shows a mode when the twisted rail is clamped. It is a top view of the pressure welding machine applied to description of a prior art. It is a front view of the fixed clamp in the pressure welding machine of FIG. It is a figure which shows the joining state of the twisted rail applied to description of a subject. It is a figure explaining the problem at the time of clamping the rail of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Long material gas pressure welding machine 5 Small return device 6 Pressure welding machine 7 Fixed side edge part support apparatus 8 Pressure welding machine moving rail 11 Pressurization cylinder 12 Support frame 13 Moving frame 16 Fixed frame 22 Fixed frame main body 23 Fixed rail accommodation hole 24 ( 24a, 24b) Fixed side chuck hole 25 (25a, 25b) Fixed side chuck 26 (26a, 26b) Fixed rail clamping cylinder 27 (27a, 27b) Fixed side cylinder head 31 Moving frame main body 33 Moving rail receiving hole 34 (34a) 34b) Moving side chuck hole 35 (35a, 35b) Moving side chuck 36 (36a, 36b) Moving rail clamp cylinder 37 (37a, 37b) Moving side cylinder head 38 Chuck body 39 Chuck rocking body 40 Pad 41 Lubricant supply Part 42 Body-side rocking surface 43 Recess 44 Arc surface (oscillator-side oscillatory surface)
45 Convex part 51 Linearity adjustment part 55 Height adjustment part 58 Rotation adjustment part 71 Cylinder head for pressurization

Claims (4)

A plurality of long materials are clamped by pressing the chucks against both sides in the vicinity of one end of each of the long materials, and the ends of the long materials are butt-matched and heated while being pressurized. In the long material gas pressure welding machine that presses the scale material,
A chuck that clamps one long material has a pad portion that contacts both side portions of the long material;
A long material gas pressure welding machine comprising: a chuck body that supports a pad portion so as to be swingable so that the pad portion can swing according to twisting of the long material.   The pad portion and the chuck body have an arc surface of the same shape, the arc surface of the pad portion slides in contact with the arc surface of the chuck body, and the engaging portion is disposed on the pad portion along the sliding direction. 2. The long material according to claim 1, wherein the chuck body is provided with an engaged portion that is loosely fitted to the engaging portion, and the pad portion and the chuck body are slidably engaged with each other. Gas pressure welding machine. At least the hardness of the engaged portion of the chuck body, the long material gas welding machine according to claim 2, wherein it is set to hardness by Redirecting a hearing hardness of the engaging portion of the pad portion.   The lubricant supply part which supplies the lubricant which lubricates the circular arc surface of a pad part and a chuck | zipper main body, and lubricates the engagement surface of an engaging part and a to-be-engaged part is provided, or characterized by the above-mentioned. 3. The long material gas pressure welding machine according to 3.

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