Positioning jig and method for manufacturing member

Abstract

To ensure proper centering of cylindrical members with varying diameters. [Solution] The positioning jig is configured to hold a cylindrical member so that its central axis coincides with a first reference line, and comprises first and second clamping parts and four contact parts, two of which are provided on each clamping part. Each clamping part is located on both sides of the first reference line and can approach the first reference line at the same speed along a second reference line perpendicular to the first reference line. Each contact part has a contact surface that contacts the cylindrical part of the cylindrical member. When each clamping part approaches the first reference line, the shortest distance to the first reference line on each contact surface coincides with the shortest distance on the other contact surfaces.

Description

Technical Field

[0001] The present disclosure relates to a positioning jig and a method for manufacturing a member using the positioning jig.

Background Art

[0002] As described in Patent Document 1, in order to join the ends of two steel pipes, a jig for holding these steel pipes in a state where their central axes are aligned is known.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the jig of Patent Document 1, the central axes of the two steel pipes are made to coincide by simply approaching or separating an arm plate and a press arm provided with two roller shafts respectively. Therefore, it is difficult to align the center of a steel pipe with a non-uniform diameter using the jig of Patent Document 1. Note that centering means holding a cylindrical member in a state where its central axis is arranged at a predetermined position.

[0005] In one aspect of the present disclosure, it is desirable to perform good centering of a cylindrical member with a non-uniform diameter.

Means for Solving the Problems

[0006] One aspect of the present disclosure is a positioning jig configured to hold a cylindrical member having a cylindrical portion which is a portion that extends straight along a central axis and has a circular cross-section perpendicular to the central axis, comprising first and second clamping portions and four contact portions. The first and second clamping portions are located on either side of a first reference line which is a virtual straight line, and can move toward and away from the first reference line by moving along a second reference line which is a virtual straight line perpendicular to the first reference line. Each of the four contact portions is a portion having a contact surface that contacts the cylindrical portion of the cylindrical member, and two contact portions are provided on each of the first and second clamping portions. The positioning jig is configured to hold the cylindrical member such that the central axis coincides with the first reference line. In each of the first and second clamping portions, the contact surfaces of two contact portions are located on either side of a reference plane which is a virtual plane containing the first and second reference lines. When the first and second clamping parts approach the first reference line, the speed at which the first clamping part moves along the second reference line is the same as the speed at which the second clamping part moves along the second reference line. When the first and second clamping parts approach the first reference line, the position and shape of each contact surface are adjusted so that the shortest distance to the first reference line on each contact surface matches the shortest distance on the other contact surfaces.

[0007] According to the above configuration, when the first and second clamping portions are brought closer to the first reference line, the shortest distance from each contact surface to the first reference line gradually decreases while maintaining the same length. Therefore, after placing a cylindrical member between the first and second clamping portions, when each clamping portion is brought closer to the first reference line, each contact surface can displace the cylindrical member so that the central axis of the cylindrical portion coincides with the first reference line, regardless of the diameter of the cross-sectional area of ​​the cylindrical portion of the cylindrical member. Therefore, centering of a cylindrical member having a cylindrical portion with an irregular diameter can be achieved effectively.

[0008] In one aspect of this disclosure, the contact surfaces of the two contact portions provided in each of the first and second clamping portions may be arranged symmetrically with respect to a reference plane. With the above configuration, when the first and second clamping portions are brought closer to the first reference line, it becomes possible to gradually decrease the shortest distance from each contact surface to the first reference line while maintaining the same length.

[0009] In one aspect of the present disclosure, each contact portion may have a rotating body configured to rotate about an axis parallel to a first reference line. The rotating body of each contact portion may have a cylindrical portion extending along the axis, and a contact surface may be formed on the outer circumferential surface of the portion.

[0010] With the above configuration, friction between the contact surface and the cylindrical part can be suppressed as the rotating body rotates, thus enabling good centering. In one aspect of the present disclosure, each contact portion may have two rotating bodies arranged such that their axes are aligned in a straight line.

[0011] According to the above configuration, the cylindrical member can be held in a more stable state. One aspect of the present disclosure provides a method for manufacturing a member comprising a cylindrical member having a cylindrical portion which extends straight along a central axis and has a circular cross-section perpendicular to the central axis. The method for manufacturing the member comprises holding the cylindrical member with the positioning jig described above so that the central axis coincides with a first reference line, and applying a predetermined manufacturing process to the cylindrical member held by the positioning jig.

[0012] According to the above configuration, in the manufacturing process of a component comprising a cylindrical member having a cylindrical portion with an irregular diameter, the centering of the cylindrical member can be achieved effectively. [Brief explanation of the drawing]

[0013] [Figure 1] This is a front view of a positioning jig of the first embodiment that holds a cylindrical member. [Figure 2] This is a top view of a positioning jig of the first embodiment that holds a cylindrical member. [Figure 3] This is a top view of the first and second clamping portions of the positioning jig of the first embodiment used for centering. [Figure 4] This is a top view of the first and second clamping portions of the positioning jig of the second embodiment used for centering. [Modes for carrying out the invention]

[0014] Hereinafter, exemplary embodiments of the present disclosure will be described with reference to the drawings. [1. First Embodiment] [(1) Overview] The positioning jig 1 of the first embodiment, as an example, is used to center a sizing converter 3 mounted on a vehicle (see Figures 1 and 2). The sizing converter 3 is a cylindrical member having a cylindrical portion 30 with a central axis 3A, and centering means holding the sizing converter 3 so that the central axis 3A coincides with a first reference line VL1, which is a virtual line at a predetermined position (see Figure 3). Of course, the positioning jig 1 may also be used to center cylindrical members other than the sizing converter 3, for example, exhaust purification devices other than the sizing converter 3, on-board components other than exhaust purification devices, or components not mounted on a vehicle.

[0015] [(2) Sizing Converter] The sizing converter 3 is a component that forms the flow path for exhaust gas from the engine, and a catalyst 33 for purifying exhaust gas is arranged inside it (see Figure 1). Of course, exhaust purification components other than the catalyst 33 may also be arranged in the sizing converter 3. The sizing converter 3 comprises the cylindrical portion 30 described above and the first and second tapered portions 31 and 32.

[0016] The cylindrical portion 30 is a cylindrical part that extends straight along the central axis 3A, and the catalyst 33 is arranged inside it. The cross-section of the cylindrical portion 30 perpendicular to the central axis 3A is circular, and the central axis 3A passes through the center of this cross-section. Furthermore, the diameter of this cross-section is constant.

[0017] The first and second tapered portions 31, 32 are portions provided at both ends of the cylindrical portion 30, and each has first and second openings 31A, 32A located at both ends of the sizing converter 3. The first opening 31A is an exhaust inlet, and the second opening 32A is an exhaust outlet. Also, the first and second tapered portions 31, 32 each have a smaller cross-sectional diameter as they go towards the first and second openings 31A, 32A.

[0018] Further, the sizing converter 3 has the size of the cross-sectional diameter orthogonal to the central axis 3A in the cylindrical portion 30 determined according to the size of the catalyst 33. For this reason, compared with a conventional converter in which the size of the cross-sectional diameter was uniformly determined, the tolerance of the cross-sectional diameter in the cylindrical portion 30 of the sizing converter 3 is large.

[0019] [(3) Positioning jig] The positioning jig 1 includes a main body portion 10, a movable mechanism 11, first and second arms 12, 13, first and second clamping portions 2A, and first and second holding portions 14, 15 (see FIGS. 1 and 2). The main body portion 10 is located in front of the first reference line VL1 and is a portion extending along the first reference line VL1 (see FIGS.

[0020] <Main body portion> 1 and 2). As an example, the first reference line VL1 extends in the vertical direction, but is not limited to this, and may be inclined with respect to the vertical direction or may extend in the horizontal direction.

[0021] <Movable mechanism> The movable mechanism 11 is supported by the main body portion 10 and is located between the first reference line VL1 and the main body portion 10 (see FIGS. 1 and

[0022] <First and second arms>[[ID=)) The first and second arms 12 and 13 are positioned at both ends of the movable mechanism 11 in the direction of the second reference line VL2, and are plate-shaped parts that protrude from the movable mechanism 11 toward the first reference line VL1 (see Figures 1 and 2).

[0023] <First and second holding parts> The first and second holding parts 14 and 15 are provided on the main body 10 and hold the first and second tapered parts 31 and 32 of the sizing converter 3, respectively, in order to fix the position of the sizing converter 3 (see Figures 1 and 2).

[0024] As an example, the first retaining portion 14 is positioned perpendicular to the first reference line VL1 and is configured as a flat plate-shaped portion extending from the main body portion 10 toward the first reference line VL1. The end face of the first retaining portion 14 on the side of the first reference line VL1 is provided with a semicircular retaining surface 14A that abuts against the edge of the first opening 31A of the first tapered portion 31.

[0025] Furthermore, the second retaining portion 15 is a portion that protrudes from the main body portion 10 toward the first reference line VL1, and a lid portion 15A, which is a lid-like portion that closes the second opening 32A of the second tapered portion 32, is provided at the end toward the first reference line VL1.

[0026] [(4) First and second clamping parts] The first and second clamping portions 2A and 2B are located at the ends of the first and second arms 12 and 13 on the side of the first reference line VL1, respectively (see Figures 1 and 2). As the movable mechanism 11 moves the first and second arms 12 and 13, the first and second clamping portions 2A and 2B move closer to and further away from the first reference line VL1 along the direction of the second reference line VL2. These clamping portions 2A and 2B have the same configuration.

[0027] Each clamping portion 2A, 2B is a flat plate-shaped portion that extends in a direction perpendicular to the direction of the first reference line VL1, and has first and second main surfaces 20, 21 that overlap in the direction of the first reference line VL1 (in other words, the thickness direction). When viewed in the direction of the first reference line VL1, each clamping portion 2A, 2B is located on both sides of the first reference line VL1 and is bent in a V-shape so as to protrude on the opposite side of the first reference line VL1. In other words, the first and second clamping portions 2A, 2B are aligned in a direction that intersects the first reference line VL1, and the first reference line VL1 is sandwiched between them.

[0028] More specifically, when viewed in the direction of the first reference line VL1, each clamping portion 2A, 2B extends so as to intersect with the reference plane VP, and both ends of each clamping portion 2A, 2B in the direction of extension are located on either side of the reference plane VP. The reference plane VP is a virtual plane that includes the first and second reference lines VL1 and VL2. The reference plane VP passes through the center of the extension direction of each clamping portion 2A, 2B, and each portion of each clamping portion 2A, 2B divided by the reference plane VP is symmetrical with respect to the reference plane VP. Also, as an example, each clamping portion 2A, 2B is positioned at the same location in the direction of the first reference line VL1. However, this is not limited to this, and the positions of each clamping portion 2A, 2B in the direction of the first reference line VL1 may be different.

[0029] <Rotating body> Each clamping section 2A, 2B has four rotating bodies 23, which are cylindrical parts extending straight along an axis 23A parallel to the first reference line VL1 (see Figures 1 and 2). The cross-section of these rotating bodies 23 perpendicular to the axis 23A is circular, and the axis 23A passes through the center of the cross-section. Each rotating body 23 is rotatable about the axis 23A. Furthermore, these rotating bodies 23 and their outer circumferential surfaces 24 are the same shape and size, and the diameter of the cross-section perpendicular to the first reference line VL1 on the outer circumferential surface 24 of each rotating body 23 is constant. In addition, the outer circumferential surface 24 of the rotating body 23 protrudes toward the first reference line VL1 side than the end faces of each clamping section 2A, 2B, and is configured as a contact surface that abuts against the cylindrical section 30 during centering.

[0030] When viewed in the direction of the first reference line VL1, two rotating bodies 23 are positioned near both ends of each clamping section 2A and 2B in the extension direction. In other words, each clamping section 2A and 2B has two rotating bodies 23 on both sides of the reference plane VP. At both ends of each clamping section 2A and 2B, the two rotating bodies 23 are located on the side of the first main surface 20 and the side of the second main surface 21, and are positioned so that their axes 21A are aligned in a straight line.

[0031] More specifically, base portions 22 are provided at both ends of each clamping portion 2A, 2B, protruding from the first main surface 20 and the second main surface 21, and a rotating body 23 is positioned at the tip of the base portion 22. As an example, the outer circumferential surfaces 24 of each rotating body 23 provided on the first main surface 20 of each clamping portion 2A, 2B are in the same position in the direction of the first reference line VL1, and the outer circumferential surfaces 24 of each rotating body 23 provided on the second main surface 21 of each clamping portion 2A, 2B are also in the same position in the same direction.

[0032] As an example, the outer circumferential surfaces 24 of the two rotating bodies 23 provided on the first main surfaces 20 of each clamping portion 2A, 2B are arranged symmetrically with respect to the reference plane VP. Similarly, the outer circumferential surfaces 24 of the two rotating bodies 23 provided on the second main surfaces 21 of each clamping portion 2A, 2B are also arranged symmetrically with respect to the reference plane VP.

[0033] However, this is not limited to this, and for example, the position of the outer peripheral surface 24 of each rotating body 23 provided on the first and second main surfaces 20 and 21 of each clamping portion 2A and 2B can be determined as appropriate. Also, the number of rotating bodies 23 provided at both ends of each clamping portion 2A and 2B in the extension direction can be determined as appropriate. Specifically, for example, one rotating body 23 may be provided on one main surface at both ends of each clamping portion 2A and 2B. In other words, each clamping portion 2A and 2B may be provided with two rotating bodies 23. Also, for example, three or more rotating bodies 23 may be provided at both ends of each clamping portion 2A and 2B.

[0034] [(5) Behavior of each clamping part during centering] When centering is performed, the movable mechanism 11 uses an actuator to move the first and second clamping parts 2A and 2B along the second reference line VL2 at the same speed, bringing each clamping part 2A and 2B closer to the first reference line VL1 (see Figure 3). Note that the movable mechanism 11 is not limited to an actuator; for example, the pressing force applied by the operator may be used as a power source to bring the first clamping part 2A and the second clamping part 2B closer together in the same manner.

[0035] Here, the outer circumferential surfaces 24 of the four rotating bodies 23 in each clamping section 2A, 2B are the same shape and size, and the outer circumferential surfaces 24 of the two rotating bodies 23 arranged on the respective main surfaces 20, 21 of each clamping section 2A, 2B are symmetrical with respect to the reference plane VP.

[0036] Therefore, as each clamping portion 2A, 2B approaches the first reference line VL1, the shortest distance from the outer circumferential surface 24 of each rotating body 23 of each clamping portion 2A, 2B to the first reference line VL1 coincides with the shortest distance from the outer circumferential surface 24 of the other rotating body 23. Then, as each clamping portion 2A, 2B approaches the first reference line VL1, the shortest distance from the outer circumferential surface 24 of each rotating body 23 gradually decreases.

[0037] [(6) Method for manufacturing exhaust components] The positioning jig 1 is used in a method for manufacturing an exhaust component having a sizing converter 3. Specifically, the manufacturing method comprises a first step of centering the sizing converter 3 and a second step of applying a predetermined manufacturing process to the sizing converter 3.

[0038] <1st process> In the first step, the sizing converter 3 is centered using the positioning jig 1 (see Figures 3A and 3B).

[0039] Specifically, first, the movable mechanism 11 separates the first and second clamping portions 2A and 2B, creating a space between the four rotating bodies 23 of the first clamping portion 2A and the four rotating bodies 23 of the second clamping portion 2B for positioning the cylindrical portion 30 of the sizing converter 3.

[0040] The sizing converter 3 is then placed in the space. At this time, the lid portion 15A of the second holding portion 15 of the sizing converter 3 closes the second opening 32A of the second tapered portion 32, thereby holding the sizing converter 3 with the second holding portion 15. In addition, the holding surface 14A of the first holding portion 14 comes into contact with the edge surrounding the first opening 31A of the first tapered portion 31 of the sizing converter 3, thereby holding the sizing converter 3 with the first holding portion 14. At this stage, the central axis 3A of the sizing converter 3 and the first reference line VL1 do not coincide.

[0041] Subsequently, the movable mechanism 11 moves the first and second clamping parts 2A and 2B along the second reference line VL2 at the same speed, bringing them closer to the first reference line VL1. As a result, the outer circumferential surfaces 24 of the four rotating bodies 23 of each clamping part 2A and 2B come into contact with the cylindrical part 30 of the sizing converter 3 from both sides, clamping the cylindrical part 30. At this time, the sizing converter 3 can be displaced so that the central axis 3A of the cylindrical part 30 coincides with the first reference line VL1, and as a result, centering is achieved.

[0042] Of course, as mentioned above, the positioning jig 1 can also center cylindrical members other than the sizing converter 3, and in the centering process, centering may be performed on such cylindrical members in the same manner.

[0043] <Second process> In the second step, the sizing converter 3 is centered using the positioning jig 1 and then subjected to a predetermined manufacturing process. In this embodiment, as an example, welding W is performed to the end of the exhaust pipe 4 at the opening of the first holding part 14 (see Figure 1). However, this is not limited to this, and in the second step, members other than the exhaust pipe 4 may be welded to the sizing converter 3, or manufacturing processes other than welding may be performed on the sizing converter 3.

[0044] [2. Second Embodiment] [(1) Overview] The positioning jig 1 of the second embodiment is different from the first embodiment in the configuration of the first and second clamping portions 5A and 5B (see FIG. 4). Hereinafter, the differences between the positioning jig 1 of the second embodiment and the first embodiment will be described.

[0045] [(2) First and Second Clamping Portions] The first and second clamping portions 5A and 5B of the second embodiment approach and separate from the first reference line VL1 by the movable mechanism 11, similar to the first embodiment (see FIG. 4). Also, similar to the first embodiment, the first clamping portion 5A and the second clamping portion 5B have the same configuration.

[0046] Each clamping portion 5A, 5B is a flat plate-like portion that extends in a direction orthogonal to the direction of the first reference line VL1 and extends in the longitudinal direction orthogonal to the reference plane VP. Each clamping portion 5A, 5B has a V-shaped end face 50, an opposite end face 51, and first and second lateral end faces 52, 53.

[0047] <V-shaped End Face> The V-shaped end face 50 is an end face facing the first reference line VL1 and is notch-cut in a V shape (see FIG. 4). Specifically, the V-shaped end face 50 has first and second inclined faces 50A, 50B that are V-shaped when viewed in the direction of the first reference line VL1, and first and second outer faces 50C, 50D.

[0048] <First and Second Inclined Faces> The first and second inclined faces 50A, 50B have the same shape and the same size, and each extends straight so as to be inclined with respect to the longitudinal direction from the center in the longitudinal direction of the V-shaped end face 50, in other words, from the position where the V-shaped end face 50 intersects the reference plane VP (see FIG,. 4). Each inclined face 50A, 50B inclines toward the opposite end face 51 as it goes toward the center. Although details will be described later, each inclined face 50A, 50B is configured as a contact face that contacts the cylindrical portion 30 of the sizing converter 3 during centering.

[0049] Furthermore, the first and second inclined surfaces 50A and 50B extend in a planar manner parallel to the first reference line VL1. In other words, the shape of the cross-section perpendicular to the first reference line VL1 on each inclined surface 50A and 50B is constant. Also, as an example, the first and second inclined surfaces 50A and 50B of each clamping section 5A and 5B are arranged symmetrically with respect to the reference plane VP. Also, as an example, the first and second inclined surfaces 50A and 50B of each clamping section 5A and 5B have the same shape and size, and are in the same position in the direction of the first reference line VL1.

[0050] However, this is not the only option; for example, the positions of the inclined surfaces 50A and 50B of each clamping portion 5A and 5B can be determined as appropriate. Specifically, for example, the inclined surfaces 50A and 50B of each clamping portion 5A and 5B may be spaced apart.

[0051] <First and second outer surfaces> The first outer surface 50C is located between the first inclined surface 50A and the first lateral end surface 52, and the second outer surface 50D is located between the second inclined surface 50B and the second lateral end surface 53.

[0052] <Other end faces> The opposite end face 51 is located on the opposite side of the V-shaped end face 50 and extends straight in the longitudinal direction (see Figure 4).

[0053] Furthermore, the first and second lateral end faces 52 and 53 are located at both ends in the longitudinal direction of each clamping portion 5A and 5B, respectively, and extend straight in the direction of the second reference line VL2. The first and second lateral end faces 52 and 53 connect each end of the V-shaped end face 50 to each end of the opposite end face 51, respectively.

[0054] [(3) Behavior of each clamping part during centering] When centering is performed, the movable mechanism 11 moves the first and second clamping portions 5A and 5B along the second reference line VL2 at the same speed using an actuator, in the same manner as in the first embodiment, bringing each clamping portion 5A and 5B closer to the first reference line VL1 (see Figure 4).

[0055] Here, the first and second inclined surfaces 50A and 50B of each clamping portion 5A and 5B are the same shape and size, and the first and second inclined surfaces 50A and 50B of each clamping portion 5A and 5B are symmetrical with respect to the reference plane VP.

[0056] Therefore, as each clamping portion 5A, 5B approaches the first reference line VL1, the shortest distance to the first reference line VL1 on each inclined surface 50A, 50B of each clamping portion 5A, 5B coincides with the shortest distance of the other inclined surfaces 50A, 50B. Then, as each clamping portion 5A, 5B approaches the first reference line VL1, the shortest distance of each inclined surface 50A, 50B gradually decreases.

[0057] [3. Effects] (1) According to the above embodiment, when each clamping portion is brought closer to the first reference line VL1, the shortest distance from the outer peripheral surface 24 of each rotating body 23, or each inclined surface 50A, 50B (hereinafter referred to as the contact surface) to the first reference line VL1 gradually decreases while maintaining the same length. For this reason, after positioning the cylindrical portion 30 of the sizing converter 3 between the first and second clamping portions, when each clamping portion is brought closer to the first reference line VL1, each contact surface first comes into contact with the cylindrical portion 30. Then, each contact surface can displace the sizing converter 3 so that the central axis 3A of the cylindrical portion 30 coincides with the first reference line VL1, regardless of the diameter of the cross-section of the cylindrical portion 30. For this reason, centering of the sizing converter 3 having a cylindrical portion 30 with an irregular diameter can be performed well.

[0058] Furthermore, centering is achieved by the contact surfaces contacting the cylindrical portion 30, rather than the first and second tapered portions 31 and 32 of the sizing converter 3. Therefore, even if each tapered portion 31 and 32 is eccentric with respect to the central axis 3A, good centering can be achieved.

[0059] (2) Furthermore, the contact surfaces of each clamping portion are arranged to be symmetrical. Therefore, when each clamping portion is brought close to the first reference line VL1, it is possible to gradually decrease the shortest distance from each contact surface to the first reference line VL1 while maintaining the same length.

[0060] (3) Furthermore, during centering, when displacing the sizing converter 3 to align the central axis 3A of the cylindrical portion 30 with the first reference line VL1, the sizing converter 3 may rotate. In contrast, according to the first embodiment, since the outer circumferential surface 24 of the rotating body 23 is configured as a contact surface with the cylindrical portion 30, the contact surface (in other words, the outer circumferential surface 24) in contact with the cylindrical portion 30 can rotate in response to the rotation of the sizing converter 3 that occurs during centering. As a result, friction between the contact surface and the cylindrical portion 30 can be suppressed, and centering can be performed well.

[0061] (4) Furthermore, according to the first embodiment, two rotating bodies 23 are provided at both ends of each clamping portion 2A, 2B in the extension direction, such that their axes 233A are aligned in a straight line. This allows the sizing converter 3 to be held in a more stable state.

[0062] [4. Other Embodiments] (1) In the first embodiment, the outer circumferential surface 24 of each cylindrical rotating body 23 provided in each clamping portion 2A, 2B is configured as a contact surface with the cylindrical portion 30 of the sizing converter 3. In the second embodiment, the planar inclined surfaces 50A, 50B in each clamping portion 5A, 5B are configured as contact surfaces with the cylindrical portion 30 of the sizing converter 3.

[0063] However, at least one contact surface can be provided on each side of the reference surface VP in each clamping portion. The multiple contact surfaces of each clamping portion are arranged in a direction that intersects the reference surface VP, sandwiching the reference surface VP between them. The position, shape, and number of each contact surface can be appropriately adjusted within a range that satisfies the condition that, as each clamping portion approaches the first reference line VL1, the shortest distance from each contact surface to the first reference line VL1 coincides with the shortest distance from the other contact surfaces.

[0064] Specifically, for example, in the first embodiment, instead of the outer peripheral surface 24 of the rotating body 23 of each clamping portion 2A, 2B, a non-rotating arc-shaped contact surface may be provided, having the same shape as the portion of the outer peripheral surface 24 that protrudes toward the first reference line VL1 side from the end face of each clamping portion, and positioned at the same location as that portion. Also, for example, in the second embodiment, the inclined surfaces 50A, 50B of each clamping portion 5A, 5B may have an arc shape that bulges toward the first reference line VL1 side.

[0065] (2) Multiple functions of one component in the above embodiment may be realized by multiple components, or one function of one component may be realized by multiple components. Also, multiple functions of multiple components may be realized by one component, or one function realized by multiple components may be realized by one component. Furthermore, some of the configurations of the above embodiment may be omitted. Also, at least some of the configurations of the above embodiment may be added to or replaced with the configurations of other above embodiments.

[0066] [5. Correspondence between wordings] In the first embodiment, the portions near both ends in the extension direction of each clamping portion 2A, 2B correspond to an example of a contact portion. Similarly, in the second embodiment, the portions near each inclined surface 50A, 50B of each clamping portion 5A, 5B correspond to an example of a contact portion. [Explanation of symbols]

[0067] 1...Positioning jig, 10...Main body, 11...Movable mechanism, 12,13...First and second arms, 14,15...First and second holding parts, 2A,2B...First and second clamping parts, 20,21...First and second main surfaces, 22...Base, 23...Rotating body, 23A...Axis, 24...Outer surface, VL1,VL2...First and second reference lines, VP...Reference surface, W...Weld, 3...Sizing converter, 3A...Central axis, 30...Cylindrical part, 31,32...First and second tapered parts, 33...Catalyst, 4...Exhaust pipe, 5A,5B...First and second clamping parts, 50...V-shaped end face, 50A...First inclined surface, 50B...Second inclined surface.

Claims

1. A positioning jig configured to hold a cylindrical member having a cylindrical portion which is a portion that extends straight along a central axis and has a circular cross-section perpendicular to the central axis, The first and second clamping parts are located on both sides of a first reference line, which is a virtual straight line, and move along a second reference line, which is a virtual straight line perpendicular to the first reference line, thereby enabling them to approach and move away from the first reference line. The tubular member comprises four contact portions, each of which has two contact surfaces that abut against the cylindrical portion, and which are provided in pairs on each of the first and second clamping portions. The positioning jig is configured to hold the cylindrical member so that the central axis and the first reference line coincide. In each of the first and second clamping portions, the contact surfaces of the two contact portions are located on both sides of a reference plane which is a virtual plane including the first and second reference lines. As the first and second clamping portions approach the first reference line, the moving speed of the first clamping portion along the second reference line and the moving speed of the second clamping portion along the second reference line are the same. When the first and second clamping portions approach the first reference line, the position and shape of each contact surface are adjusted so that the shortest distance from each contact surface to the first reference line coincides with the shortest distance from the other contact surface. Positioning jig.

2. A positioning jig according to claim 1, In each of the first and second clamping portions, the contact surfaces of the two contact portions are arranged symmetrically with respect to the reference plane. Positioning jig.

3. A positioning jig according to claim 1 or claim 2, Each of the aforementioned contact portions has a rotating body configured to rotate about an axis parallel to the first reference line, Each of the rotating parts of the contact portion has a cylindrical portion extending along the axis, and the contact surface is formed on the outer circumferential surface of the portion. Positioning jig.

4. A positioning jig according to claim 3, Each of the aforementioned contact portions has two of the rotating bodies arranged such that their axes are aligned in a straight line. Positioning jig.

5. A method for manufacturing a member comprising a cylindrical member having a cylindrical portion which is a portion that extends straight along a central axis and has a circular cross-section perpendicular to the central axis, The positioning jig described in claim 1 or claim 2 holds the cylindrical member so that the central axis and the first reference line coincide, The cylindrical member held by the positioning jig is subjected to a predetermined manufacturing process, A method for manufacturing a component that includes the above.

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