JP2016078099A - Method for manufacturing flange joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a flange joint by which a load on a projection of a punch, which is used when forming a recess in the flange joint is reduced.SOLUTION: A method for manufacturing a flange joint by press working of a plate material 1 by use of a die 3 and a punch 7 includes: a process in which one face 1a of the plate material 1 is supported by the die 3, and a punch 7, which has an endless projection 6 in a circumferential direction, is pressed onto the other face 1b of the plate material 1 thereby forming a recess 8; and a process in which a through hole is provided in the plate material 1 on an inner side with respect to the recess 8 thereby forming a salient on the plate material 1. A pressing surface 6a of a tip part of the projection 6 is so formed as to be separated from the die 3 as approaching an outer side from an inner side.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a method for manufacturing a flange joint.

  Conventionally, as a metal flange joint that is welded and fixed to the end of a pipe, as shown in FIG. 8, a concentric annular convex portion 103 and an annular shape with respect to a through hole 102 drilled in the center portion of the flange joint 101. The concave portion 104 is formed in order from the peripheral portion of the through hole 102 toward the outer side, and the end portion of the pipe 106 is fitted into the through hole 102 so that the end portion of the pipe 106 and the annular convex portion 103 are arranged on the entire circumference. By performing fillet welding with the welding torch 110 and fixing it, the heat capacity of the end of the pipe 106 and the heat capacity of the annular projection 103 are made equal, and the pipe 106 and the flange joint 101 are securely fixed by welding. Is known (see Patent Document 1).

  Further, as shown in FIG. 9, with one surface 111a of a metal plate 111 supported by a die 112, the other surface 111b is pressed with a punch 113 having an annular protrusion 113a having a trapezoidal cross section. A plate member 111 having an annular recess 115 is known (see Patent Document 2).

JP 2007-107624 A JP 2008-229710 A

  However, in the conventional method for forming the annular recess 115 shown in FIG. 9, the pressing surface 113 b of the tip of the annular protrusion 113 a in the punch 113 is formed in parallel with the other surface 111 b of the plate material 111. When the pressure is pressed, the inner side of the annular protrusion 113a receives an internal pressure from a material that does not escape, and a thrust load is generated to try to tilt the annular protrusion 113a outward. For this reason, stress concentrates on the root portion of the annular protrusion 113a, and the annular protrusion 113a may be damaged as indicated by E in FIG.

  Accordingly, an object of the present invention is to provide a method for manufacturing a flange joint in which the above problems are solved.

In order to solve the above problems, the present invention relates to a flange joint manufacturing method for manufacturing a flange joint by pressing a plate material using a die and a punch.
A step of supporting one surface of the plate member with the die, and pressing a punch having a projection having an endless circumferential direction on the other surface of the plate member to form a recess;
On the inner side of the concave portion, the plate material has a step of forming a through hole and forming a convex portion on the plate material,
The pressing surface of the tip of the projection is formed so as to be separated from the die as it goes from the inside to the outside.

In the process of forming the recess,
You may make it at least one part of the other surface located inside the recessed part in the said board | plate material and at least one part of the surface located inside the said protrusion in the said punch not mutually contact.

In the process of forming the recess,
The entire other surface of the plate material positioned inside the recess and the entire surface of the punch positioned inside the protrusion may not contact each other.

In the process of forming the recess,
An outer peripheral portion on the other surface located inside the concave portion in the plate material and an outer peripheral portion on a surface located on the inner side from the protrusion in the punch are in contact,
A surface on the inner side of the outer peripheral portion on the other surface of the plate member and a surface on the inner side of the outer peripheral portion of the punch may not contact each other.

  According to the present invention, one surface of the plate material is supported by a die, and a punch having a protrusion having an endless circumferential shape is formed on the other surface of the plate material to form a recess, and the pressing surface of the protrusion is By forming the projections so as to be separated from the die toward the outside from the die, a thrust load is generated that causes the projections to fall inward when the projections are pressed against the plate material. The action which tries to cancel the thrust load which arises arises, and the damage of the base part of a processus | protrusion can be suppressed.

The top view of the board | plate material for demonstrating the manufacturing method of the flange joint which concerns on Example 1 of this invention. Sectional drawing of FIG. It is a figure for demonstrating the recessed part formation process which concerns on Example 1 of this invention, and sectional drawing before press work. Sectional drawing of the state which pressed the punch against the board | plate material from the state of FIG. The figure which abbreviate | omitted the cross section line in the partial expanded cross section of the protrusion part of the punch in FIG. Sectional drawing for demonstrating the recessed part formation process which concerns on Example 2 of this invention. Sectional drawing for demonstrating the recessed part formation process which concerns on Example 3 of this invention. Sectional drawing explaining the welding method of the edge part of a pipe and metal flange joints in a prior art. Sectional drawing for demonstrating the formation method of the annular recessed part in a prior art. Sectional drawing for demonstrating the problem of a prior art.

  The best mode of the present invention will be described based on an embodiment shown in the drawings.

[Example 1]
1 to 5 show a first embodiment of the present invention.

  Metal plate material (hereinafter referred to as plate material) 1 formed in a strip shape, which is a workpiece, is sequentially sent to a single pressing machine (not shown) provided with a plurality of molds, and flange joints are formed by progressive pressing. 2 is manufactured. FIG. 1 is a top view of a plate 1 for explaining each step of press working, and FIG. 2 is a cross-sectional view of FIG. The plate 1 is sequentially fed from the left side in FIG. 1 to the right side (X direction), and press working is performed in the order of each step.

  First, as shown in FIG. 3, one surface 1 a of the plate material 1 is supported by the upper surface 3 a of the die 3. As the plate 1, any material and plate thickness can be used, but in this embodiment, mild steel or stainless steel having a plate thickness of 6 to 9 mm was used.

  Next, as shown in FIGS. 1 and 2, in part A, pilot holes 5 are formed at predetermined positions in the longitudinal direction of the plate 1 at predetermined positions in the plate 1.

  Next, after sequentially feeding the plate material 1 to the right side, the punch 7 having the projection 6 having an oval shape with an endless circumferential direction shown in FIG. 3 is shown in FIG. 1, FIG. 2, and FIG. Thus, the other surface 1b of the board | plate material 1 is pressed, and the recessed part formation process which forms the oval-shaped recessed part 8 whose circumferential direction is endless is performed. In the present embodiment, the protrusion 6 and the recess 8 are formed in an annular oval shape as shown in FIG. 1 in plan view, but have a shape corresponding to the peripheral shape of a through hole 11 described later, and It can be formed in any shape as long as the circumferential direction is formed in an endless shape (closed loop shape) consisting of straight lines and curved surfaces, ie, a perfect circle, ellipse, etc., polygon, It can be formed in any shape such as an irregular shape.

  As shown in FIG. 3, the punch 7 has a flat punch surface 9 and an annular protrusion 6 that surrounds the punch surface 9 and has an endless circumferential direction. A punch surface 9 is formed on the surface. As shown in FIG. 5, the protrusion 6 is formed in a substantially trapezoidal shape whose diameter decreases from the base portion 7 a of the punch 7 toward the die 3 side (front portion side), as shown in FIG. 5.

  The pressing surface 6a formed at the tip portion of the protrusion 6 is formed as an inclined surface that is inclined so as to be separated from the die 3 (the height from the base portion 7a is reduced) as it goes from the inside to the outside. Further, the inner surface 6b of the protrusion 6 is inclined outward as it goes to the die 3 side, and the outer surface 6c is inclined inward as it goes to the die 3 side.

  The inclination angle θ of the pressing surface 6 a with respect to the horizontal plane (punch surface 9) is arbitrarily set depending on the material of the plate material 1, the shape and depth of the recess 8, and is set to 1 to 2 ° in this embodiment. The pressing surface 6a may be formed so as to be separated from the die 3 as it goes from the inside to the outside, and may be formed in a curved shape such as an arc other than the tapered shape as shown in the figure.

  As shown in FIG. 4, the punch surface 9 comes into contact with the other surface 1 b of the plate 1 when a predetermined recess 8 is formed.

  Next, after the plate material 1 in which the annular recess 8 is formed is sequentially fed to the right side, the plate material 1 is sandwiched between upper and lower dies not shown in FIG. A distortion correction process for correcting the distortion is performed. This step may not be performed depending on the material of the plate material, the shape and depth of the recesses, and the degree of processing distortion.

  Next, after the plate material 1 whose processing distortion has been corrected is sequentially fed to the right side, as shown in FIG. 1 and FIG. 2, in the portion D, a concave portion is formed inside the annular concave portion 8 using a punch and a die (not shown). A through-hole 11 is drilled at a predetermined interval with respect to 8. As shown in FIG. 1 and FIG. 2, a plurality of small holes 13 are formed at predetermined locations and the outer shape is removed by the punch and die (not shown) and the flange joint 2 is obtained. (Flange forming process). Note that well-known punches and dies (not shown) for forming the through holes 11 and the like can be used.

  By forming the through-hole 11 inside the recess 8, as shown in FIGS. 1 and 2, the through-hole 11 is located inside the recess 8, that is, between the recess 8 and the through-hole 11. An annular convex portion 15 having an endless circumferential direction is formed over the entire circumference of the peripheral portion.

  The through hole 11 is a hole for fitting a pipe end portion, and the small hole 13 is a hole for inserting a bolt or the like when the flange joint 2 is fastened to a member to be fastened. It is.

  As described above, when the pressing surface 6a is formed on the inclined surface that is separated from the die 3 from the inside toward the outside, when the protrusion 6 is pressed against the other surface 1b of the plate member 1, the protrusion 6 Since a thrust load that falls inward is generated, the action of trying to counteract the thrust load that tries to tilt the protrusion outward as described in the problem of the conventional protrusion forming method occurs. Can be prevented from being damaged. Thereby, the processing load concerning the punch 7 can be reduced.

[Example 2]
FIG. 6 shows a second embodiment of the present invention.

  In the first embodiment, when the concave portion 8 is formed, the entire punch surface 9 positioned inside the annular protrusion 6 is brought into contact with the other surface 1b of the plate member 1. When the recess 8 is formed, the entire surface 19 positioned on the inner side of the annular protrusion 6 is not brought into contact with the entire other surface 1d on the inner side of the recess 8 in the plate member 1. If this surface 19 is a shape which does not contact | abut the other surface 1b of the board | plate material 1 when forming the recessed part 8, it can be formed in arbitrary shapes, such as a plane.

  Since other structures are the same as those of the first embodiment, description thereof is omitted.

  Also in the second embodiment, the same actions and effects as those of the first embodiment can be exhibited.

  In the second embodiment, when the annular recess 8 is formed, the surface 19 located on the inner side of the annular protrusion 6 does not contact the other surface 1d on the inner side of the recess 8 in the plate material 1. As a result, a gap 20 is formed between the other surface 1b of the plate 1 and the surface 19 located on the inner side of the annular protrusion 6, and the surplus due to the formation of the recess 8 also plastically flows into this gap 20. Thus, the surface 1d on the inner side of the concave portion 8 constituting the convex portion 15 can be made to protrude from the general surface 1c that is the other surface outside the concave portion 8 in the plate 1 (higher by H shown in FIG. 6). .

  Thereby, when the flange joint 2 and the end portion of the pipe are fixed by welding, the adjustment of the heat capacity of the convex portion with respect to the heat capacity of the pipe end portion is facilitated, and the weldability of the flange joint 2 is improved compared to that of the first embodiment. Can be improved.

  Further, the surplus when the projection 6 is pressed against the other surface 1b of the plate member 1 can also plastically flow into the gap 20, reducing the internal pressure received from the material against the projection 6 and tilting the projection 6 outward. The thrust load to be reduced can be reduced as compared with the prior art, the damage to the root portion of the protrusion 6 can be suppressed, and the processing load applied to the punch 7 can be reduced.

[Example 3]
FIG. 7 shows a third embodiment of the present invention.

  In the second embodiment, when the recess 8 is formed, the entire surface 19 located on the inner side of the annular protrusion 6 is not in contact with the entire other surface 1d on the inner side of the recess 8 in the plate 1. However, at least a part of the surface located on the inner side of the annular protrusion 6 may not contact with at least a part of the other surface 1d on the inner side of the recess 8 in the plate member 1.

  For example, as shown in FIG. 7, the outer peripheral portion 21 on the surface located on the inner side of the annular protrusion 6 is brought into contact with the outer peripheral portion 1 e on the surface located on the inner side of the concave portion 8 in the plate member 1. The surface 22 positioned on the inner side of the outer peripheral portion 21 may not be in contact with the surface 1 f positioned on the inner side of the outer peripheral portion 1 e of the plate 1.

  In addition, it is preferable to set the outer peripheral part 1e of the board | plate material 1 to be the same or large as the part in which the convex part 15 formed in the flange formation process which is a subsequent process is located. Further, the surface 22 positioned on the inner side of the outer peripheral portion 21 of the projection 6 may be a flat surface or the like as long as it does not come into contact with the surface 1f positioned on the inner side of the outer peripheral portion 1e of the plate 1 when the concave portion 8 is formed. It can be formed in any shape.

  Since other structures are the same as those of the first embodiment, description thereof is omitted.

  Also in the third embodiment, the same actions and effects as those of the first embodiment can be exhibited.

  In the third embodiment, the outer peripheral portion 21 on the surface located on the inner side of the annular protrusion 6 is further in contact with the outer peripheral portion 1e on the surface located on the inner side of the concave portion 8 in the plate member 1. The processing accuracy of the convex portion 15 can be improved as compared with the second embodiment.

  Further, the surface 22 located on the inner side of the outer peripheral portion 21 of the protrusion 6 is not brought into contact with the surface 1f located on the inner side of the outer peripheral portion 1e of the plate member 1 so that the surface 22 on the inner side of the outer peripheral portion 21 of the protrusion 6 is obtained. A gap 23 is formed between the outer peripheral portion 1e and the surface 1f on the inner side of the outer peripheral portion 1e, and the surplus when the projection 6 is pressed against the other surface 1b of the plate member 1 can also plastically flow into the gap 23 The internal pressure that the projection 6 receives from the material is reduced, and the thrust load that tries to tilt the projection 6 outward is reduced as compared to the prior art, so that damage to the root portion of the projection 6 is suppressed and the processing load on the punch 7 is reduced. can do.

[Other Examples]
In the above embodiment, one through hole is formed in the flange joint, but a plurality of through holes may be formed. In that case, a concave portion and a convex portion are formed in the peripheral portion of each through hole.

  In the said Example, although the flange joint was formed by progressive press using one press apparatus, you may make it manufacture each process using a different press apparatus.

DESCRIPTION OF SYMBOLS 1 Board | plate material 1d The other surface located inside the recessed part in a board | plate material 1e The outer peripheral part in the other surface located inside the recessed part in a board | plate material 1f The surface inside the outer peripheral part in the other surface of a board | plate material 2 Flange joint 3 Die 6 Protrusion 6a Press surface 7 Punch 8 Recess 11 Through hole 15 Protrusion 19 Surface located on the inner side of the protrusion in the punch 21 Outer surface on the surface located on the inner side of the protrusion in the punch 22 Surface on the inner side of the outer periphery in the punch

Claims (4)

In a flange joint manufacturing method of manufacturing a flange joint by pressing a plate material using a die and a punch,
A step of supporting one surface of the plate member with the die, and pressing a punch having a projection having an endless circumferential direction on the other surface of the plate member to form a recess;
On the inner side of the concave portion, the plate material has a step of forming a through hole and forming a convex portion on the plate material,
The method of manufacturing a flange joint, wherein the pressing surface of the tip of the protrusion is formed so as to be separated from the die as it goes from the inside to the outside. In the process of forming the recess,
The at least part of the other surface located inside the recess in the plate material and at least a part of the surface located inside the protrusion in the punch are not in contact with each other. Manufacturing method for flange joints. In the process of forming the recess,
3. The method for manufacturing a flange joint according to claim 2, wherein the entire other surface located inside the concave portion of the plate member and the entire surface located inside the projection of the punch do not contact each other. . In the process of forming the recess,
An outer peripheral portion on the other surface located inside the concave portion in the plate material and an outer peripheral portion on a surface located on the inner side from the protrusion in the punch are in contact,
The method for manufacturing a flange joint according to claim 2, wherein a surface inside the outer peripheral portion of the other surface of the plate member and a surface inside the outer peripheral portion of the punch are not in contact with each other.

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