JP2009233709A - Extrusion bending apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an extrusion bending apparatus enabling a pipe material to be extruded and bent into a complicated shape and a weld part to be reduced. <P>SOLUTION: In the extrusion bend processing apparatus 1, a straight hole 3 and a bent hole 4 are formed at an outer frame 5, the latter of which is provided with a mandrel 6, and the pipe material 2 is inserted into the straight hole 3 and bent by extruding it into the bent hole 4 by an extrusion device 7. The mandrel 6 is formed of a plurality of division parts 16 from its top end to its rear end, and a flexible wire 18 is connected with the division part 16 at the leading end. The flexible wire 18 is inserted into a rear division part 16 and extended to the division part 16 at the rear most end, the mandrel 6 comprising these division parts 16 is located at the bent hole 4, and its leading end is located at the predetermined position of the bent hole 4. Respective division parts 16 are tightly connected to form the mandrel 6 by applying copressed force to each division part 16 at the flexible wire 18. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an extrusion bending apparatus for extrusion bending a pipe material.

  As shown in FIGS. 10 and 11, the extrusion bending apparatus 30 includes an outer frame 31 having a straight hole portion 3 that accommodates the pipe material 2 and a bent hole portion 4 that is formed by being connected to the straight hole portion 3. A mandrel 32 provided in the bent hole portion 4 and fitted in the tube material 2 and an extrusion device 7 for extruding the tube material 2 in the straight hole portion 3 to the bent hole portion 4 are configured.

  According to this extrusion bending apparatus 30, even a pipe having an outer diameter of several hundred mm used in a nuclear power plant or the like can be reliably bent.

JP 2002-113524 A

  By the way, piping used in nuclear power plants and the like is required to reduce the number of welds as much as possible for the purpose of eliminating weld inspection during operation. However, in the above-described extrusion bending apparatus 30, the mandrel 32 is formed in a hook shape along the bending hole portion 4, and the mandrel 32 must be pulled out from the tube material 2 after bending the tube material 2. Only a substantially J-shaped pipe 35 in which a bent pipe part 34 is formed on one end side of the straight pipe part 33 as shown in (a) can be manufactured. For example, the bent pipe part 34 as shown in FIG. There was a problem that the substantially L-shaped pipe 36 in which the straight pipe portions 33 were formed at both ends could not be manufactured. For this reason, after manufacturing the J-shaped pipe 35, a straight pipe has to be attached to the bent pipe part 34 of the pipe 35 by welding, and there is a problem that the number of welds cannot be reduced.

  Then, the objective of this invention is providing the extrusion bending apparatus which can solve the said subject, can extrude-bend a pipe material to a complicated shape, and can reduce a welding part.

  In order to solve the above-mentioned problems, the present invention forms a straight hole portion that accommodates a pipe material to be bent and a bending hole portion that bends the pipe material by being connected to the straight hole portion in the outer frame. In order to prevent deformation of the pipe material bent into the hole, a mandrel that is fitted into the pipe and bent along the bent hole is provided, and the pipe is inserted into the straight hole of the outer frame, and the pipe is extruded. In an extrusion bending apparatus that extrudes and bends into a bending hole with an apparatus, the mandrel is formed of a plurality of divided parts from the front end to the rear end, and a flexible wire is connected to the divided part at the front end and the flexible The wire is inserted through the rear split part and extended to the rearmost split part, and the mandrel consisting of these split parts is positioned in the bending hole, and the tip is placed at a predetermined position of the bending hole. It is location, and is obtained by the mandrel in close connecting each divided part by applying a compressive force to the divided parts in the flexible wire.

  When connecting the cord to each of the divided parts and pulling out the mandrel from the bent pipe, it is better to pull out the mandrel while disassembling the mandrel by pulling the cord so that it is pulled in order from the divided parts on the base end side. .

  The split part may be formed with a fitting part that detachably engages with an adjacent split part and restricts movement of the adjacent part in the twisting direction.

  The fitting portion includes a male fitting portion formed on one of two adjacent divided parts, and a female fitting portion formed on the other divided part and fitted to the male fitting portion, The male fitting portion may be formed with a blade portion extending in the radial direction.

  According to the present invention, the pipe material can be extruded and bent into a complicated shape, and the number of welds can be reduced.

  Preferred embodiments of the present invention will be described with reference to the accompanying drawings.

  As shown in FIGS. 1 and 2, the extrusion bending apparatus 1 includes a first straight hole portion 3 that houses a pipe material 2 to be bent, and a bending that is connected to the first straight hole portion 3 to bend the pipe material 2. Deformation of the outer frame 5 having the hole portion 4 and the second straight hole portion 27 that is connected to the bending hole portion 4 to process the pipe 2 in a straight line, and the tube material 2 that is provided in the bending hole portion 4 and is bent. In order to prevent this, a mandrel 6 fitted into the tube material 2 and an extrusion device 7 for pushing the tube material 2 in the first straight hole portion 3 into the bending hole portion 4 are configured.

  The outer frame 5 is formed of a block-shaped female mold formed so as to be split into two. Each dividing surface 8 of the outer frame 5 is formed with a groove 9 having a shape in which the first straight hole portion 3, the bent hole portion 4, and the second straight hole portion 27 are halved, and the outer frame 5 is divided. By doing so, the pipe material 2 in the bending hole 4 can be taken out. The first straight hole portion 3 is opened with one end facing the outside of the outer frame 5, and the other end is connected to the bending hole portion 4. The bent hole portion 4 has one end connected to the other end of the first straight hole portion 3 and the other end connected to one end of the second straight hole portion 27. The second straight hole portion 27 is connected at one end to the other end of the bending hole portion 4 and opened at the other end toward the outside of the outer frame 5.

  The extrusion device 7 is provided facing the opening 10 of the first straight hole portion 3, and the push-out arm 11 inserted into the first straight hole portion 3 and the push-out arm 11 are inserted into and removed from the first straight hole portion 3. And a drive unit (not shown) for driving in the direction of movement.

  As shown in FIGS. 1, 5, and 6, the mandrel 6 is disposed facing the opening 12 of the second straight hole portion 27, and is attached to and detached from a fixing system (not shown) such as a column outside the outer frame 5. It has a proximal end 13 that can be fixed. The mandrel 6 includes a straight portion 14 that extends linearly from the base end portion 13 and is accommodated in the second straight hole portion 27, and a bent portion 15 that is bent along the bent hole portion 4 from the tip of the straight portion 14. Have. Further, the mandrel 6 is configured by connecting a plurality of divided parts 16 from the front end to the base end (rear end).

  The divided parts 16 are formed in a shape obtained by dividing a rod body bent into a predetermined shape in accordance with the shape of the pipe to be formed into a plurality of parts in the longitudinal direction. Of the divided parts 16, the tip part 17 positioned at the tip is formed in a hemispherical shape on the tip side, and is formed on a substantially flat surface perpendicular to the central axis direction of the rod body on the base side. One end of the flexible wire 18 is connected to the center of the distal end part 17 on the proximal end side. Of the divided parts 16, the intermediate part 19 positioned between the tip part 17 and the base end part 13 is formed in a cylindrical shape so that the flexible wire 18 is inserted through the center. The intermediate part 19 is formed so that when the mandrel 6 is pulled out from the bent tube material 2, the intermediate part 19 is divided and pulled out one by one. Is done. The cord 20 may be anything that can withstand the heat during processing, and may be composed of, for example, a wire or a chain. The other end of the cable 20 may be provided with an identification unit (not shown) indicating the divided parts 16 to be connected. The identification unit may be a tag on which a number or the like is written, or may be formed by coloring the other end of the cable 20. In particular, the intermediate part 19 constituting the bent portion 15 is divided so that the angles θ between the divided surfaces 21 centering on the bent center O are equal.

  As shown in FIGS. 3, 4, and 5, each divided part 16 is fitted to the adjacent divided part 16 so as to be detachable and to restrict the movement of the adjacent divided part 16 in the twisting direction. A portion 22 is formed. The fitting portion 22 includes a male fitting portion 23 formed on one of two adjacent divided parts 16 and a female fitting portion 24 formed on the other divided part 16 and fitted to the male fitting portion 23. Consists of. The male fitting portion 23 is formed at the center of the split surface 21 of the split part 16 and protrudes in a cylindrical shape in the axial direction, and a blade portion formed by extending radially outward from the outer periphery of the core portion 25. 26. Two blade portions 26 are formed at intervals of 180 degrees in the circumferential direction so as to extend from the core portion 25 in the diameter direction. In particular, the blade portion 26 is formed along a radial direction centering on the bending center O of the mandrel 6 so that the fitting portion 22 can be easily engaged and disengaged.

  The female fitting portion 24 is formed in a concave shape corresponding to the core portion 25 and the blade portion 26, and the male fitting portion 23 is fitted therein.

  Further, the base end portion 13 is provided with a tightening device (not shown) for pulling the flexible wire 18.

  Next, the operation of this embodiment will be described.

  As shown in FIG. 1, when bending the pipe material 2, first, the divided parts 16 are connected to form a mandrel 6 having a predetermined shape, and then the mandrel 6 is placed in the bending hole 4 of the outer frame 5. The extrusion bending apparatus 1 is assembled by positioning the tip of the mandrel 6 at a predetermined position of the bending hole 4 and installing the outer frame 5 and the mandrel 6 at the predetermined position.

  As shown in FIGS. 3 and 4, when connecting the divided parts 16, first, the flexible wires 18 connected to the tip parts 17 are inserted into the intermediate parts 19 in a predetermined order, and the cables of the respective intermediate parts 19 are connected. 20 is inserted through all the intermediate parts 19 on the base end side, and the fitting parts 22 of the adjacent divided parts 16 are fitted together. At this time, the core portion 25 of the fitting portion 22 aligns the centers of the adjacent divided parts 16, and the blade portion 26 aligns the positions in the circumferential direction. It can be surely made into a predetermined shape.

  Thereafter, as shown in FIG. 5, the flexible wire 18 is inserted into the proximal end portion 13 and the flexible wire 18 is pulled by a tightening device so that the distal end part 17 is pulled toward the proximal end portion 13 side. Thereby, a compressive force acts on each divided part 16, and each divided part 16 is closely connected to form a mandrel 6 having a predetermined shape.

  As shown in FIG. 2, when the mandrel 6 is positioned in the bending hole 4 of the outer frame 5, the outer frame 5 is divided into two parts to divide the bending hole part 4, and the divided bending hole part 4 is divided into the divided bending hole parts 4. The mandrel 6 is accommodated and the outer frame 5 is assembled.

  When the extrusion bending apparatus 1 is assembled in this way, as shown in FIG. 1, the preheated tube material 2 is accommodated in the first straight hole portion 3 of the outer frame 5, and the extruding device 7 uses the tube material. 2 is extruded into the bending hole 4 and bent. The tube material 2 is bent along the bending hole portion 4 and fitted into the mandrel 6, and is molded into a predetermined shape while being prevented from being deformed into a shape that does not follow the bending hole portion 4, such as being crushed. In addition, the tube material 2 that has passed through the bent hole portion 4 and reached the second straight hole portion 27 is formed into a straight line.

  Thereafter, the outer frame 5 is divided, the tube material 2 is taken out from the bent hole portion 4, and the mandrel 6 is taken out from the tube material 2. When taking out the mandrel 6 from the inside of the tube material 2, first, the base end portion 13 is removed from the rear-part split part 16 and the fastening device is removed from the flexible wire 18. Thereafter, as shown in FIG. 7, the cord 20 of the intermediate part 19 located at the rearmost end in the pipe material 2 is pulled and separated from the adjacent intermediate part 19 and pulled out of the pipe material 2. At this time, the flexible wire 18 functions as a shaft that guides the intermediate part 19, and prevents the intermediate part 19 from being caught by being rotated in the pipe member 2. Thereafter, the same operation is sequentially repeated to draw all the intermediate parts 19 out of the pipe material 2, and then the flexible wire 18 is drawn to pull out the tip part 17 to the outside of the pipe material 2. Since the mandrel 6 can be sequentially divided and pulled out, the mandrel 6 can be easily taken out from the tube material 2 even when the tube material 2 is bent into a shape other than the J shape, for example, an L shape, The tube material 2 can be extruded and bent into a complicated shape.

  In this way, the mandrel 6 is formed by a plurality of divided parts 16 from the front end to the rear end, and the flexible wire 18 is connected to the front end part 17 which is the front divided part 16 and the flexible wire 18 is connected to the rear divided part. 16 is extended to the split part 16 at the end, and the mandrel 6 composed of these split parts 16 is positioned in the bending hole 4, and the tip thereof is positioned at a predetermined position of the bending hole 4, and Since the compression force is applied to each divided part 16 by the flexible wire 18 and the divided parts 16 are closely connected to form the mandrel 6, the mandrel 6 can be easily divided into a plurality of divided parts by eliminating the compression force by the flexible wire 18. The mandrel 6 can be easily divided from the inside of the tube material 2 even if the tube material 2 is formed into a complicated shape such as an L shape. Can Nuku come, can be extruded bent tubing 2 into complex shapes. For this reason, it is possible to reduce the welded structure required at one end of the bent portion of the pipe material 2, and it is possible to manufacture an integrated pipe shape with a reduced welded structure.

  Further, when the cord 20 is connected to each of the divided parts 16 and the mandrel 6 is pulled out from the bent tube 2, the mandrel 6 is disassembled by pulling the cord 20 so as to be pulled in order from the divided part 16 on the proximal end side. Therefore, the mandrel 6 in the pipe 2 can be easily divided into a plurality of divided parts 16 and can be easily pulled out.

  The split part 16 is formed with a fitting portion 22 that detachably engages with the adjacent split part 16 and restricts movement of the adjacent split part 16 in the twisting direction. Thus, when the mandrel 6 is formed, it can be surely and easily formed into a predetermined shape.

  The fitting portion 22 includes a male fitting portion 23 formed on one of two adjacent divided parts 16 and a female fitting portion 24 formed on the other divided part 16 and fitted to the male fitting portion 23. Since the blade portion 26 extending in the radial direction is formed in the male fitting portion 23, movement of the adjacent divided parts 16 in the twist direction can be easily restricted with a simple structure.

  In addition, although the fitting part 22 shall consist of the male fitting part 23 formed in one of the two adjacent divided parts 16, and the female fitting part 24 formed in the other divided part 16, However, the present invention is not limited to this, and both the male fitting portion 23 and the female fitting portion 24 may be formed so as to mesh with each other on the facing divided surface 21.

  Moreover, although the intermediate part 19 which comprises the bending part 15 shall be divided | segmented so that the angle (theta) between the division surfaces 21 centering on the bending center O may become equal, the intermediate part 19 is easily made from the pipe material 2. When pulling out, the angle θ between the divided surfaces 21 may not be equal.

  Furthermore, although the extrusion bending apparatus 1 which manufactures L-shaped piping was described, this invention is not limited to this. You may manufacture piping which has a some bending part from which a bending radius and a bending direction differ. For example, as shown in FIG. 8, a pipe 41 having a bending pipe portion 40 bent three-dimensionally, specifically, a first bending portion 42 bent around a horizontal axis and a first bending portion bent around a vertical axis. The piping 41 provided with the bending pipe part 40 which has the 2 bending part 43 may be manufactured. In this case, as shown in FIGS. 9A and 9B, the bending hole portion 45 of the extrusion bending apparatus 44 is formed along the shapes of the first bending portion 42 and the second bending portion 43 shown in FIG. The bent portion 47 of the mandrel 46 is preferably bent along the bent hole portion 45.

It is a sectional side view of the extrusion bending apparatus which shows suitable embodiment of this invention. It is a top view of FIG. It is a perspective view in the state where a split part is connected and a mandrel is assembled. It is a perspective view in the state where a split part is connected and a mandrel is assembled. It is a side view of the state which pulled the flexible wire and has connected the divided parts closely. It is a principal part perspective view of a mandrel. It is a perspective view in the state where the divided parts are divided from the mandrel. It is a perspective view of the other example of piping which can be manufactured with the extrusion bending apparatus which concerns on this invention. (A) is a side view of the bending apparatus which manufactures piping of FIG. 8, (b) is a top view of (a). It is a sectional side view of the conventional extrusion bending apparatus. It is a top view of FIG. It is a side view of piping manufactured with an extrusion bending apparatus, (a) shows what can be manufactured with the conventional extrusion bending apparatus, (b) shows what can be manufactured with the extrusion bending apparatus which concerns on this invention. .

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Extrusion bending apparatus 2 Tubing material 3 1st straight hole part (straight hole part)
4 Bending hole 5 Outer frame 6 Mandrel 7 Extruder 16 Split part 17 Tip part (Split part)
18 flexible wire 20 rope 22 fitting part 23 male fitting part 24 female fitting part 26 blade part

Claims (4)

  The outer frame is formed with a straight hole part that accommodates the pipe material to be bent and a bent hole part that is connected to the straight hole part to bend the pipe material and prevents deformation of the pipe material that is bent into the bent hole part. A mandrel that fits into the pipe material and bends along the bending hole is provided, the pipe is inserted into the straight hole of the outer frame, and the pipe is extruded into the bending hole by an extrusion device. In the extrusion bending apparatus, the mandrel is formed of a plurality of divided parts from the front end to the rear end, a flexible wire is connected to the front divided part, and the flexible wire is inserted through the rear divided part to be the last The mandrel made of these divided parts is positioned in the bending hole, the tip thereof is positioned at a predetermined position of the bending hole, and the flexible wall is extended. Extrusion bending device, characterized in that the mandrel in close connecting each divided part by applying a compressive force to the divided parts at ya.   When connecting a cord to each of the divided parts and pulling out the mandrel from the bent pipe, the cord is pulled out in order from the divided part on the base end side, and the mandrel is pulled out while disassembling. Item 2. An extrusion bending apparatus according to Item 1.   The extrusion bending apparatus according to claim 1 or 2, wherein the divided part is formed with a fitting part that is detachably fitted to an adjacent divided part and restricts movement of the adjacent part in a twisting direction.   The fitting portion includes a male fitting portion formed on one of two adjacent divided parts, and a female fitting portion formed on the other divided part and fitted to the male fitting portion, The extrusion bending apparatus according to claim 3, wherein the male fitting portion is formed with a blade portion extending in a radial direction.

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