JP2016049560A - Fastening structure and fastening method of pipe and flange member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fastening structure and a fastening method of a pipe and a flange member which secures sealing performance, moreover, does not cause distortion or the like, can minimize a space necessary when performing an operation and also can reduce a cost.SOLUTION: A fastening structure of a pipe 10 and a flange member 20 is a structure for fastening the flange member 20 on a top end part 12 of the pipe 10. The flange member 20 has an opening part 22 communicated with a passage 11 of the pipe 10, and an annular first holding part 24 and an annular second holding part 25 protrusively formed toward the inner side from a peripheral part 23 of the opening part 22. The top end part 12 of the pipe 10 is formed between the first holding part 24 and the second holding part 25 while the diameter is enlarged to the outer side, and by being held between the first holding part 24 and the second holding part 25, the top end part 12 of the pipe 10 is fastened to the peripheral part 23 of the opening part 22 of the flange member 20.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a fastening structure and a fastening method for a pipe and a flange member.

  Conventionally, a pipe joined with a flange member has been widely used in automobiles, industrial machines, home appliances, and the like, and is used in many parts thereof. Moreover, such joining of the pipe and the flange member has been performed by welding or brazing the flange member to the tip of the pipe (see, for example, Patent Document 1).

JP 2014-98412 A

  However, when the pipe and the flange member are joined by welding or brazing as described above, there is a problem that the joining portion needs to be heated to a high temperature, which causes sensitization, distortion, and the like of the joining portion. Further, there is a demand for further weight reduction for such pipes, and there is a high possibility that the pipes will be made thinner. However, in the future, even if it is attempted to join a flange member to a pipe that has been thinned due to a demand for weight reduction, there is a possibility that normal joining cannot be performed due to increased distortion and the like. Further, with regard to welding, if the bending points of the flange member and the pipe are close, there is a problem that a space for welding cannot be secured and welding cannot be performed. Further, since the brazing is a lot production, there is a problem that the productivity is low and the cost is increased.

  The present invention has been made in view of such circumstances. A pipe and a flange that can reduce the space required for work without reducing distortion and the like, while ensuring the sealing performance. It is an object of the present invention to provide a member fastening structure and a fastening method.

  In order to solve this problem, the invention according to claim 1 of the present invention has a structure in which a flange member is fastened to a tip portion of a pipe, and the flange member has an opening communicating with a passage of the pipe. And an annular first sandwiching portion and a second sandwiching portion that project inwardly from the peripheral edge of the opening, and the tip of the pipe is expanded outward. It is formed between the first sandwiching portion and the second sandwiching portion in a state, and is sandwiched between the first sandwiching portion and the second sandwiching portion, so that the tip end portion of the pipe becomes the flange member A fastening structure of a pipe and a flange member fixed to the peripheral edge portion of the opening is provided.

  According to a second aspect of the present invention, there is provided a method for fastening a flange member to a tip portion of a pipe, the flange member including an opening communicating with a passage of the pipe, An annular first sandwiching portion and a second sandwiching portion projecting inward from the peripheral edge, and the tip portion of the pipe is connected to the first sandwiching portion and the second sandwiching portion. The tip end portion of the pipe is fixed to the peripheral edge portion of the opening portion of the flange member by inserting the gap between the first holding portion and the second holding portion while expanding the outside diameter. It is characterized by the fastening method of the pipe and the flange member.

  In addition to the invention according to claim 2, the invention according to claim 3 of the present invention inserts the tip end portion of the pipe between the first sandwiching portion and the second sandwiching portion, and The first clamping is performed by a pressing jig that presses from the insertion destination side of the tip of the pipe toward the insertion source while holding the second clamping part from the insertion source side of the tip of the pipe. The first sandwiching portion and the second sandwiching portion are formed by deforming the portion from the insertion destination side of the tip portion of the pipe toward the insertion source side, thereby expanding the tip portion of the pipe to the outside. And a fastening method of the flange member and the pipe fixed to the peripheral edge portion of the opening of the flange member.

  In addition to the invention according to claim 2, the invention according to claim 4 of the present invention inserts the tip of the pipe between the first clamping part and the second clamping part, and With the first pressing jig of a press that presses from the insertion destination side of the tip of the pipe toward the insertion source, the first clamping portion is directed from the insertion destination side of the tip of the pipe toward the insertion source. While pressing and deforming, the second clamping jig of the press presses the second clamping portion to press from the insertion source side to the insertion destination side of the tip portion of the pipe, and the insertion source side of the tip portion of the pipe The flange is pressed and deformed toward the insertion destination side, and the tip end portion of the pipe is clamped by the first clamping portion and the second clamping portion while being expanded outside, and the flange is formed. Tightening of pipe and flange member fixed to the peripheral edge of the opening of the member Characterized in that the method.

  In addition to the invention according to any one of claims 2 to 4, the invention described in claim 5 of the present invention is characterized in that the first holding part before holding the tip part of the pipe is an inner side. An angle is provided so as to incline downward from the outside toward the outside, and the tip end portion of the pipe is brought into contact with the first clamping portion from above, and the first clamping portion is pressed from below to above Then, when the pipe is deformed, the pipe and the flange member are fastened by the angle so that the tip of the pipe is guided to the outside by the angle.

  In addition to the invention described in any one of claims 2 to 5, the flange member is an upper stage of a large diameter with respect to the plate-like flange member base material. An opening having a step portion composed of a lower step portion with a small diameter is formed, and among these, the lower step portion is formed at a location to be the first clamping portion, and a part of the peripheral portion of the upper step portion is pushed downward It is characterized in that a method of fastening the pipe and the flange member that forms the second clamping part by inclining inward is provided.

  According to invention of Claim 1 and 2 of this invention, the front-end | tip part of a pipe is clamped by the 1st clamping part and 2nd clamping part of a flange member in the diameter-expanded state, Therefore Since it is designed to be fixed to the peripheral edge of the opening, it is possible to secure a tight seal between the pipe and the flange member at the same time without performing welding or brazing. In the above, distortion or the like does not occur, and the space required for the work can be reduced, and the cost can be reduced.

  According to the invention described in claim 3 of the present invention, the first holding portion is deformed by the pressing jig while the second holding portion is suppressed by the holding jig, so that the tip end portion of the pipe is moved outward. Since the diameter is expanded, the first clamping part and the second clamping part are clamped and fixed to the peripheral edge of the opening of the flange member. Can be clamped, and the sealing performance in fastening the pipe and the flange member can be ensured with a smaller apparatus.

  According to the invention described in claim 4 of the present invention, the tip end portion of the pipe is obtained by pressing and deforming the first clamping portion and the second clamping portion from above and below with two pressing jigs provided in the press machine. , The first clamping part and the second clamping part are clamped and fixed to the peripheral edge of the opening of the flange member. Both ends of the second clamping part can be deformed to clamp the tip of the pipe, and the sealing performance in fastening the pipe and the flange member can be ensured more securely and reliably.

  Further, according to the invention described in claim 5 of the present invention, the first clamping part before clamping the tip part of the pipe is angled so as to incline downward from the inside toward the outside, When the tip of the pipe is brought into contact with the first sandwiching portion and the first sandwiching portion is pressed upward and deformed, the tip of the pipe is guided to the outside by the angle so that the diameter is expanded. As a result, the diameter of the tip of the pipe can be easily increased, and the diameter of the tip of the pipe can be reliably increased, and can be clamped and fixed between the first clamping part and the second clamping part. .

  According to the invention described in claim 6 of the present invention, the flange member forms an opening having a predetermined step portion on the plate-like flange member base material, and a part of the peripheral portion of the upper step portion thereof. By pushing down and tilting inward, the second clamping part is formed, so that the first clamping part and the second clamping part can be reliably and efficiently formed.

(A) is a top view which shows the fastening structure of the pipe and flange member which concern on Embodiment 1 of this invention, (b) is AA sectional drawing of (a). It is sectional drawing which shows the process sequence of the fastening part of the pipe and flange member which concern on the embodiment. It is sectional drawing which shows the process sequence of the fastening part of the pipe and flange member which concern on the embodiment. It is sectional drawing which shows the procedure of the fastening method of the pipe and flange member which concern on the embodiment. It is sectional drawing which shows the procedure of the fastening method of the pipe and flange member which concern on the embodiment. It is sectional drawing which shows the procedure of the fastening method of the pipe and flange member which concern on the embodiment. It is sectional drawing which shows the fastening structure of the pipe and flange member which concern on Embodiment 2 of this invention. (A) is a top view which shows the process sequence of the fastening part of the pipe which concerns on the same embodiment, and a flange member, (b) is BB sectional drawing of (a). It is sectional drawing which shows the process sequence of the fastening part of the pipe and flange member which concern on the embodiment. It is sectional drawing which shows the process sequence of the fastening part of the pipe and flange member which concern on the embodiment. It is sectional drawing which shows the fastening structure and fastening method of the pipe and flange member which concern on Embodiment 3 of this invention.

Hereinafter, embodiments of the present invention will be described in detail.
Embodiment 1 of the Invention
First, Embodiment 1 of the present invention will be described with reference to FIGS.

  1A is a plan view showing a fastening structure of a pipe and a flange member according to Embodiment 1 of the present invention, and FIG. 1B is a cross-sectional view taken along line AA in FIG. . 2-6 is sectional drawing which shows the process of the fastening part of the pipe and flange member which concern on the embodiment, and the procedure of the fastening method.

  First, the fastening structure of the pipe 10 and the flange member 20 according to the present embodiment will be described with reference to FIGS. As shown in FIGS. 1 (a) and 1 (b), the fastening structure of the pipe 10 and the flange member 20 according to the present embodiment is a stainless steel EGR that allows exhaust gas emitted from an automobile engine to pass through an internal passage 11. The distal end portion 12 of the cylindrical pipe 10 that is a pipe has an enlarged diameter, the distal end portion 12 is caulked and fastened to the flange member 20, and the distal end portion 12 of the pipe 10 is fixed to the flange member 20. Structure. Further, the flange member 20 has an opening 22 communicating with the internal passage 11 in the pipe 10, and a first clamping part 24 and a second clamping part 25 for caulking and fastening the tip part 12 of the pipe 10. The distal end portion 12 of the pipe 10 is fixed to the peripheral edge portion 23 of the opening 22 of the flange member 20. Details will be described below.

  As shown in FIGS. 1 (a) and 1 (b), the pipe 10 of the present embodiment is formed in a predetermined cylindrical shape, and a flange member, which will be described later, in a state in which the distal end portion 12 is expanded outward. The first clamping part 24 and the second clamping part 25 are caulked to 20 and fastened to the flange member 20.

  Moreover, when the flange member 20 of this Embodiment is attached to the front-end | tip part 12 of the pipe 10, as shown to FIG. 1 (a), (b), the extension direction of the channel | path 11 of the said pipe 10 is set. It has a substantially plate-like flange member main body 21 that expands in a direction orthogonal to each other. The flange member main body 21 has an opening 22 at a substantially central portion, and the pipe 10 is fastened to the flange member 20 so that the opening 22 and the passage 11 of the pipe 10 communicate with each other. It has become.

  Further, as shown in FIGS. 1A and 1B, engagement holes 26 through which screws or the like are passed are formed at predetermined positions on both sides of the opening 22 in the flange member main body 21. For example, when the pipe 10 to which the flange member 20 is attached is joined to the engine main body, the flange member 20 is brought into contact with a portion of the engine main body where the engagement hole is provided, and the engagement hole 26 is overlapped to be screwed or the like. By fixing with a nut or the like through, the pipe 10 is configured to be joined with the opening 22 communicating with the engine body.

  Further, as shown in FIGS. 1A and 1B, a first clamping part 24 and a second clamping part 25 are formed on the peripheral edge 23 of the opening 22 of the flange member 20. The first sandwiching portion 24 and the second sandwiching portion 25 are annular portions formed to project inward from the peripheral edge portion 23 of the opening 22 of the flange member 20, and more obliquely inward and upward from the lower side. The first holding part 24 protrudes and the second holding part 25 protrudes obliquely inward and upward from the outer side and the upper side. And the front-end | tip part 12 of the pipe 10 of the state expanded outside is formed between the 1st clamping part 24 and the 2nd clamping part 25, and on that, the 1st clamping part 24 and the 2nd clamping part 25 are formed on it. And the tip portion 12 of the pipe 10 is sandwiched.

  Thus, according to the fastening structure of the pipe 10 and the flange member 20 according to the present embodiment, the first sandwiching portion 24 and the second sandwiching portion 24 of the flange member 20 with the distal end portion 12 of the pipe 10 being expanded in diameter. By being sandwiched by the portion 25, the flange 10 is fixed to the peripheral portion 23 of the opening 22 so that the pipe 10 and the flange member 20 can be firmly fastened, and at the same time the sealing performance can be improved. In addition, distortion and the like do not occur, and the space required for the work can be reduced and the cost can be reduced.

  Next, a method for fastening the pipe 10 and the flange member 20 according to the present embodiment will be described with reference to FIGS. In the present embodiment, a manufacturing process of the flange member 20 and a fastening process of the flange member 20 and the pipe 10 manufactured in the manufacturing process will be described. Hereinafter, each step will be described in detail.

  First, the manufacturing process of the flange member 20 will be described. First, as shown in FIG. 2A, the engagement holes 26 are formed in two places on the plate-like flange member base 20A formed in a predetermined outer shape by punching, cutting, or the like. Next, as shown in FIG. 2B, a substantially cylindrical opening 22 is formed in the center between the two engagement holes 26 by punching or cutting. Then, as shown in FIG. 2C, the peripheral portion of the lower portion of the opening 22 is extended inward to form a temporary first clamping portion 24A, thereby forming the opening 22 having an upper step portion and a lower step portion. .

  At this time, as shown in FIG. 2C, in the present embodiment, a punch 50 having a diameter that can crush a certain width of the peripheral portion of the opening 22 is used as a jig. By inserting the punch 50 from above into the opening 22 to a predetermined position, a part of the peripheral portion of the opening 22 is crushed and moved downward to form a step comprising a large-diameter upper step and a small-diameter lower step. A part is formed. Further, the punch 50 has a shape with a predetermined roundness or an inclination in the outer portion 51 at the tip portion thereof. Further, the punch 50 is not punched out, and the punch 50 has a predetermined position (for example, the thickness of the flange member base 20A). It is inserted to the half position) and stopped. Thereby, the step portion having the upper step portion and the lower step portion can be formed without cutting the metal flow (forging line) of the peripheral portion of the opening portion 22 that is moved downward by the punch 50 and extended inward. it can. As a result, the portions to be the first sandwiching portion 24 and the second sandwiching portion 25 can be formed firmly and efficiently.

  Further, in the present embodiment, when forming the lower step portion having a small diameter to be the temporary first sandwiching portion 24A as shown in FIG. 2C using the punch 50, the upper surface thereof simultaneously has a predetermined angle. It is formed in an angled state so as to incline downward from the inside toward the outside at θ (shown in FIG. 4). Specifically, the shape of the abutting portion 52 of the tip portion that contacts the lower step portion of the punch 50 is formed so as to be inclined downward from the inside toward the outside, and the lower step portion is pressed by the punch 50. However, an angled state is formed by transferring the shape of the contact portion 52 of the punch 50 to the lower step portion.

  Next, as shown in FIG. 3A, the peripheral portion of the upper portion of the opening 22 is crushed in a circular shape from the upper surface side to extrude the material of the portion inward, and at the same time the extruded portion further inward The second holding part 25 is formed by inclining (for example, inclining by about 20 ° to 60 ° with respect to the vertical direction). In addition, the lower step part in the opening part 22 by which the upper step part was processed in this way is the temporary 1st clamping part 24A as mentioned above.

  Here, as shown in FIG. 3 (a), in the present embodiment, the punch restraining jig 60 as a jig is a cylindrical member that can move up and down, and the inner portion of the tip portion 61 is directed downward. The shape is inclined so as to become thinner. And while inserting the front-end | tip part 61 of such a punch restraining jig 60 against the outer part which left the fixed part of the peripheral part of the opening part 22 and crushing from upper direction to a predetermined position, a front-end | tip part A part of the peripheral portion of the opening 22 is formed as the second clamping portion 25 by bringing the flange member base material 20 </ b> A into the inclined direction by pressing the material of the flange member base material 20 </ b> A inward at the inclined portion inside 61. ing.

  Further, the punch holding jig 60 has a shape with a predetermined roundness (for example, a roundness of 0.3R to 2R) at the abutting tip portion 61, and further, a punching tool 60 is not punched into a predetermined position ( For example, it is inserted and stopped up to half the thickness of the flange member base 20A. Thereby, since the 2nd clamping part 25 crushed by the front-end | tip part 61 of the punch holding jig 60 is shape | molded without cut | disconnecting a metal flow (forging line), the 1st clamping part 24 and the 2nd clamping part The portion to be 25 can be efficiently formed while maintaining high strength.

  Then, the process proceeds to a fastening process between the flange member 20 and the pipe 10, and the pipe 10 is inserted from above as shown in FIG. At this time, the distal end of the distal end portion 12 of the pipe 10 is a temporary distal end portion 12A that is not expanded in diameter, and has the same diameter as the upper passage 11. Further, the pipe 10 is configured such that the temporary tip portion 12A passes through the inner side of the second holding portion 25 and comes into contact with the upper surface of the temporary first holding portion 24A.

  Then, as shown in FIG. 4, when the temporary tip portion 12A of the pipe 10 is brought into contact with the upper surface of the temporary first clamping portion 24A, as shown in FIG. While pressing the second holding part 25 downward with the punch holding jig 60, the pressing jig 70 formed in a substantially trapezoidal shape when viewed from the side is moved upward from the lower side so that the temporary first holding part 24A is pushed up and crushed. It will be transformed into. At this time, the temporary tip portion 12A of the pipe 10 is expanded by holding the pipe 10 from above and pressing the temporary first clamping portion 24A with the pressing jig 70.

  At this time, as shown in FIG. 4, the inner side of the upper surface of the temporary first clamping portion 24 </ b> A is bent upward at a predetermined angle θ (for example, about 10 ° to 30 °). Thereby, the upper surface of the temporary first clamping unit 24A is a guide unit that is angled so as to incline downward from the inside toward the outside. And the temporary front-end | tip part 12A of the pipe 10 is diameter-expanded by making the temporary front-end | tip part 12A of the pipe 10 contact here, and pressing and deform | transforming the temporary 1st clamping part 24A upwards with the pressing jig 70. It is easy to be guided to the outside direction. As described above, the shape of the guide portion is formed at the same time when the temporary first clamping portion 24A is formed in FIG. Then, as shown in FIGS. 1A, 1B, and 6, a first sandwiching portion 24 that is pushed up and crushed by a predetermined amount is formed in the peripheral portion 23 of the opening 22, and together with The distal end portion 12 of the pipe 10 expanded in diameter by the first clamping portion 24 and the second clamping portion 25 is caulked and fixed to the peripheral edge portion 23 of the opening portion 22.

  As described above, according to the fastening method of the pipe 10 and the flange member 20 according to the present embodiment, the first sandwiching portion 24 and the second sandwiching portion 24 of the flange member 20 with the distal end portion 12 of the pipe 10 expanded in diameter. By being clamped by the portion 25, the pipe 10 and the flange member 20 can be firmly fixed without being welded or brazed because they are fixed to the peripheral edge portion 23 of the opening 22 of the flange member 20. At the same time that the fastening is obtained, the sealing property can be ensured, and further, a state in which distortion due to high temperature does not occur can be achieved.

  Further, in the conventional welding, it is necessary to perform work from the outside of the pipe 10 and a large work space is required. However, in the present embodiment, the outside of the pipe 10 is simply held by the punch holding jig 60. Yes, if it is pressed with the pressing jig 70 from the inside of the pipe 10 in this state, the caulking can be fixed, so that welding work can be abolished, lot production such as brazing can be avoided, and continuous production is possible. This makes it possible to improve work efficiency and reduce costs.

  Further, according to the fastening method of the pipe 10 and the flange member 20 according to the present embodiment, the first holding part 24 is deformed by the pressing jig 70 while the second holding part 25 is held by the punch holding jig 60. Thus, the distal end portion 12 of the pipe 10 is clamped by the first clamping portion 24 and the second clamping portion 25 while expanding the diameter outward, and is fixed to the peripheral edge portion 23 of the opening portion 22 of the flange member 20. Therefore, it is possible to clamp the tip 12 of the pipe 10 only by deforming the first clamping part 24, and at the same time, a firm fastening of the pipe 10 and the flange member 20 can be obtained with a smaller device, Sealability can be secured.

  Moreover, according to the fastening method of the pipe 10 and the flange member 20 according to the present embodiment, the temporary first clamping portion 24A before clamping the tip portion 12 of the pipe 10 is inclined downward from the inside toward the outside. The temporary tip 12A of the pipe 10 is brought into contact with the temporary first clamping part 24A and the temporary first clamping part 24A is pressed upward to be deformed. Thus, the provisional tip portion 12A of the pipe 10 is guided to the outside and easily expanded in diameter, and the diameter of the provisional tip portion 12A of the pipe 10 is surely increased and clamped by the first clamping portion 24 and the second clamping portion 25. And can be fixed.

  Moreover, according to the fastening method of the pipe 10 and the flange member 20 which concerns on this Embodiment, the flange member 20 forms the opening part 22 which has a predetermined step part in plate-shaped flange member base material 20A, Among them, The second holding part 25 is formed by inclining inward while crushing a part of the peripheral part of the upper stage part downward. The second sandwiching portion 25 is formed without cutting the metal flow (forging line) at the peripheral portion of the opening 22 due to the roundness, and thus the first sandwiching portion 24 and the second sandwiching portion 25 are formed. The 2nd clamping part 25 can be formed firmly and efficiently.

Moreover, according to the fastening method of the pipe 10 and the flange member 20 according to the present embodiment, the flange member 20 forms the predetermined opening 22 in the plate-like flange member base material 20A, and then the opening 22 A step portion is formed by pushing down a part of the peripheral portion while being crushed, and further, the temporary first holding portion 24A (location to be the first holding portion 24) and the second holding portion 25 are processed from the step portion. The punch 50 as a jig for forming the step portion is rounded or inclined so as to spread from the front end portion toward the rear end portion. By forming the step portion without cutting the metal flow (forging line) of the portion, the portion to be the first sandwiching portion 24 and the second sandwiching portion 25 is formed firmly and efficiently. Can do.
[Embodiment 2 of the Invention]
Next, a second embodiment of the present invention will be described with reference to FIGS. A part of the same configuration as that of the first embodiment of the present invention in the present embodiment is denoted by the same reference numeral, and description thereof is omitted.

  FIG. 7 is a cross-sectional view showing a fastening structure of a pipe and a flange member according to Embodiment 2 of the present invention, assuming that the flange member is made thin in order to reduce weight. FIG. 8A is a plan view showing a processing procedure of a fastening portion of the pipe and the flange member according to the embodiment, and FIG. 8B is a cross-sectional view taken along line BB in FIG. . 9-10 is sectional drawing which shows the process sequence of the fastening part of the pipe and flange member which concern on the embodiment.

  First, a fastening structure between the pipe 10 and the flange member 120 according to the present embodiment will be described with reference to FIG. In the fastening structure of the pipe 10 and the flange member 120 according to the present embodiment, as shown in FIG. 7, the distal end portion 12 of the pipe 10 is caulked and fixed by the flange member 120 thinner than the first embodiment of the invention described above. Structure. For this reason, reinforcing ribs such as burring are provided on the outer periphery and the caulking portion of the flange member 120. Since the other points are the same as in the first embodiment of the present invention, the description is omitted.

  Next, a method for fastening the pipe 10 and the flange member 120 according to the present embodiment will be described with reference to FIGS. In the present embodiment, a manufacturing process of the flange member 120 and a fastening process of the flange member 120 and the pipe 10 manufactured in the manufacturing process will be described. In the present embodiment, the flange member 120 is manufactured using a member subjected to burring processing, which is different from the first embodiment of the present invention described above. Hereinafter, each step will be described in detail.

  First, the manufacturing process of the flange member 120 will be described. First, with respect to the flange member main body 121 of the plate-like flange member base 120A formed in a predetermined outer shape, as shown in FIGS. An engagement hole 126 is formed. Also, as shown in FIGS. 8A and 8B, a substantially cylindrical opening 122 is formed in the center between the two engagement holes 126 by punching or cutting.

  Next, as shown in FIG. 9A, the peripheral portion of the opening 122 is bent and raised by burring to form a rising portion 127A, thereby forming the opening 122 having an enlarged opening. Thereafter, as shown in FIG. 9 (b), the rising portion 127A is pressed from above and deformed so as to be crushed by a predetermined amount, so that the rising portion 127B is increased in thickness while suppressing the rising amount.

  At this time, as shown in FIG. 9B, in the present embodiment, the inner size is regulated and the outer size is increased so that the rising portion 127A is increased by a certain width to form the rising portion 127B. The rising portion pressing jig 150 is configured as a jig that is configured to be able to crush the rising portion 127A by regulating the size. The rising portion 127B is increased in thickness by suppressing the rising amount by pressing and crushing the rising portion 127A from above with the rising portion holding jig 150 being restricted to a predetermined width. It is like that.

  Next, as shown in FIG. 10A, the material of the inner portion of the rising portion 122B is extended inward while being moved in the bottom direction by plastic working to form a temporary first clamping portion 124A, and the opening Is the narrowed opening 122 again. At this time, the remaining outer portion serves as the temporary second clamping portion 125A.

  At this time, as shown in FIG. 10A, in the present embodiment, the first punch 160 having a diameter that can crush the inner portion of the rising portion 127B is used as a jig. By inserting the first punch 160 from above into the opening 122 to a predetermined position, the fixed width of the inner portion of the rising portion 127B is crushed and moved downward, and the temporary first pinching that is the lower step portion of the small diameter A step portion including the portion 124A and a temporary second holding portion 125A which is an upper step portion having a large diameter is formed. In addition, the first punch 160 has a shape with a predetermined roundness or an inclination in the outer portion 161 at the tip thereof, and further, the first punch 160 is not punched out and is in a predetermined position (for example, a flange member base material). It is inserted and stopped up to a half position of the thickness of the rising portion 127B of 120A. Accordingly, the temporary first sandwiching portion 124A and the upper step portion of the lower step portion are cut without cutting the metal flow (forging line) of the peripheral portion of the opening portion 122 that is moved downward and extended inward by the first punch 160. A step portion having the temporary second sandwiching portion 125A can be formed. As a result, the portions that become the first sandwiching portion 124 and the second sandwiching portion 125 can be formed firmly and efficiently.

  Further, in the present embodiment, when the first punch 160 is used to form a lower step portion having a small diameter that becomes the temporary first clamping portion 124A as shown in FIG. (Similar to that shown in FIG. 4), the angle is formed so as to incline downward from the inside toward the outside. Specifically, the shape of the abutting portion 162 of the tip portion that contacts the lower step portion of the first punch 160 is formed so as to be inclined downward from the inside toward the outside. By transferring the shape of the contact portion 162 of the first punch 160 to the lower step portion while pressing the portion, an angled state is formed.

  Next, as shown in FIG. 10B, the temporary second holding portion 125 </ b> A is inclined inward (for example, inclined by about 20 ° to 60 ° with respect to the vertical direction) to form the second holding portion 125. . In addition, the lower step part in the opening part 122 by which the upper step part was processed in this way is the temporary first clamping part 124A as described above.

  Here, as shown in FIG. 10B, in the present embodiment, the second punch 170 as a jig is a cylindrical member that can move up and down, and the inner portion 171 of the tip thereof faces downward. The shape is slanted so as to be thin. Then, the inner portion 171 at the tip end portion of the second punch 170 is pressed against the outer portion of the temporary second clamping portion 125A and lowered from above to a predetermined position, whereby the temporary second portion 171 is moved by the inner portion 171. The sandwiching portion 125 </ b> A is inclined inward to form a part of the peripheral portion of the opening 122 as the second sandwiching portion 125.

  Then, the process proceeds to the fastening process of the flange member 120 and the pipe 10 similar to the first embodiment of the invention described above, and as shown in FIG. 7, the first clamping part 124 and the second clamping part obtained by deforming the temporary first clamping part 124A. The distal end portion 12 of the pipe 10 whose diameter is expanded by the portion 125 is caulked and fixed to the peripheral portion 123 of the opening portion 122.

As described above, according to the fastening method of the pipe 10 and the flange member 120 according to the present embodiment, the flange member 120 is formed using a member subjected to burring, in addition to the same effects as the first embodiment of the invention described above. Since it is made, the tip 12 of the pipe 10 can be caulked and fixed with a thinner flange member 120.
Embodiment 3 of the Invention
Next, Embodiment 3 of the present invention will be described with reference to FIG. A part of the same configuration as that of the first embodiment of the present invention in the present embodiment is denoted by the same reference numeral, and description thereof is omitted.

  FIG. 11: is sectional drawing which shows the fastening structure and fastening method of the pipe and flange member which concern on Embodiment 3 of this invention.

  First, a fastening structure between the pipe 10 and the flange member 220 according to the present embodiment will be described with reference to FIG. As shown in FIG. 11, the fastening structure of the pipe 10 and the flange member 220 according to the present embodiment is such that the tip portion 212 of the pipe 10 has a larger diameter and is larger than that of the first embodiment of the invention described above. The structure is fixed by caulking in an inclined state. Since the other points are the same as in the first embodiment of the present invention, the description is omitted.

  Next, a method for fastening the pipe 10 and the flange member 220 according to the present embodiment will be described with reference to FIG. In the present embodiment, a fastening process between the flange member 220 and the pipe 10 will be described. Note that the manufacturing process of the flange member 220 is the same as that of the first embodiment of the invention described above, and a description thereof will be omitted.

  In the fastening process of the flange member 220 and the pipe 10 according to the present embodiment, the first clamping part 224 and the second clamping part 225 of the flange member 220 can be pressed and deformed by a press machine (not shown), and the tip part is After inserting the pipe 10 whose diameter has not been expanded from above, as shown in FIG. 11, the first pressing jig 250 of the press machine having a substantially trapezoidal shape when viewed from the side is moved upward from the lower side, and the first clamping is performed. The portion 224 is pressed and deformed so as to be crushed, and the second pressing jig 260 of the press machine formed into a cylindrical shape is moved downward from above to cause the second holding portion 225 to be pressed and deformed so as to be crushed. .

  At this time, since the first pressing jig 250 and the second pressing jig 260 provided in the press machine are pressed from above and below, the tip portion 212 of the pipe 10 can be greatly expanded in diameter. Then, as shown in FIG. 11, a first clamping portion 224 that is pushed upward and crushed by a predetermined amount is formed in the peripheral edge portion 223 of the opening 222, and at the same time, is pushed downward and crushed by a predetermined amount. By forming the two sandwiching portions 225, the first sandwiching portion 224 and the tip portion 212 of the pipe 10 whose diameter is expanded by the second sandwiching portion 225 are caulked and fixed to the peripheral portion 223 of the opening 222.

  Thus, according to the fastening structure and fastening method of the pipe 10 and the flange member 220 according to the present embodiment, in addition to the same functions and effects as those of the first embodiment of the invention described above, the first pressing treatment provided in the press machine. The first holding part 224 and the second holding part 225 are pressed and deformed by the two pressing jigs of the tool 250 and the second pressing jig 260, so that the diameter of the tip end part 212 of the pipe 10 is expanded to the outside. The first sandwiching portion 224 and the second sandwiching portion 225 are clamped and clamped between the first sandwiching portion 224 and the second sandwiching portion 225 so as to be fixed to the peripheral portion 223 of the opening 222 of the flange member 220. Both ends of 225 can be deformed and the tip portion 212 of the pipe 10 can be clamped, and the sealing performance in fastening the pipe 10 and the flange member 220 can be ensured more securely and reliably.

  Each embodiment described above is described in order to facilitate understanding of the present invention, and is not described in order to limit the present invention.

  For example, in each of the above-described embodiments, the present invention is applied to a stainless steel EGR pipe that allows exhaust gas emitted from an automobile engine to pass through an internal passage. However, the present invention is not limited to this, and pipes for other purposes can be used. The present invention may be applied to fastening with a flange member.

  Further, in each of the above-described embodiments, the flange member is provided at a place where the pipe and the engine body are connected. However, the present invention is not limited to this, and the flange of the present invention is provided at a place where the pipes are connected via the flange member, for example. A member may be provided.

  Further, in each of the above-described embodiments, when the second clamping portion is suppressed from above and the first clamping portion is pressed and fixed from below, the second clamping portion and the first from both above and below are fixed. Although the case where the clamping part is pressed and fixed by caulking has been described, the present invention is not limited to this, and a method of pressing the second clamping part from above and caulking and fixing while suppressing the first clamping part from below. It may be used.

  In the first and second embodiments of the present invention, the punch restraining jig 60 as a jig for producing the second clamping part 25 of the flange member 20 (the second punch 170 corresponds to the second embodiment of the invention). And a punch restraining jig 60 as a restraining jig for restraining the second sandwiching portion 25 when the tip portion 12 of the pipe 10 is clamped and fixed by the first sandwiching portion 24 and the second sandwiching portion 25 (implementation of the invention) In the second embodiment, the same punch is used as the second punch 170). However, the present invention is not limited to this, and separate jigs may be prepared. However, by using the two jigs in common, the apparatus for caulking and fixing the pipe 10 and the flange member 20 is simplified, and the manufacturing process is also simplified, leading to cost reduction.

  Further, in each of the above-described embodiments, the pipe and the flange member are fastened only by caulking, but the present invention is not limited to this, and a sealant or an adhesive is used together in the caulking portion or after caulking and fixing. Further, welding or the like may be performed.

DESCRIPTION OF SYMBOLS 10 Pipe 11 Channel | path 12,212 Tip part 20,120,220 Flange member 20A, 120A Flange member base material 22,122,222 Opening part 23,123,223 Peripheral part 24,124,224 1st clamping part 25,125, 225 Second clamping part 60 Punch holding jig (holding jig, jig)
70 Pressing jig 170 Second punch (holding jig, jig)
250 First pressing jig 260 Second pressing jig

Claims (6)

It is a structure for fastening a flange member to the tip of the pipe,
In the flange member,
An opening communicating with the passage of the pipe;
An annular first sandwiching portion and a second sandwiching portion formed inwardly projecting from the peripheral edge of the opening,
Have
The tip portion of the pipe is formed between the first sandwiching portion and the second sandwiching portion in a state in which the diameter is expanded outward, and is sandwiched between the first sandwiching portion and the second sandwiching portion. Thus, the pipe and flange member fastening structure is characterized in that the tip of the pipe is fixed to the peripheral edge of the opening of the flange member. A method of fastening a flange member to the tip of a pipe,
In the flange member,
An opening communicating with the passage of the pipe;
An annular first sandwiching portion and a second sandwiching portion formed inwardly projecting from the peripheral edge of the opening,
Have
By inserting the tip portion of the pipe between the first sandwiching portion and the second sandwiching portion and expanding the outside diameter, the first sandwiching portion and the second sandwiching portion hold the pipe, A method for fastening a pipe and a flange member, wherein the tip end portion of the pipe is fixed to the peripheral edge portion of the opening of the flange member.   The tip of the pipe is inserted between the first sandwiching portion and the second sandwiching portion, and the second sandwiching portion is restrained from the insertion source side of the tip of the pipe with a restraining jig, By deforming the first sandwiching portion from the insertion destination side of the tip of the pipe toward the insertion source with a pressing jig that presses from the insertion destination side of the tip of the pipe toward the insertion source, The tip end portion of the pipe is clamped by the first clamping portion and the second clamping portion while being expanded outwardly, and is fixed to the peripheral edge portion of the opening portion of the flange member. A method for fastening a pipe and a flange member according to claim 2.   A first press of a press that inserts the tip portion of the pipe between the first sandwiching portion and the second sandwiching portion and presses the tip portion of the pipe from the insertion destination side to the insertion source side. Using a jig, the first holding portion is pressed and deformed from the insertion destination side of the tip portion of the pipe toward the insertion source side, and is pressed from the insertion source side of the tip portion of the pipe toward the insertion destination side. By pressing and deforming the second clamping portion from the insertion source side to the insertion destination side of the tip portion of the pipe with the second pressing jig of the press machine, the tip portion of the pipe is expanded outward. 3. The pipe according to claim 2, wherein the pipe is clamped by the first clamping portion and the second clamping portion and fixed to the peripheral edge portion of the opening of the flange member while being made to have a diameter. And flange member fastening method.   The first clamping part before clamping the tip part of the pipe is angled so as to incline downward from the inside toward the outside, and the tip part of the pipe is attached to the first clamping part. When the first holding part is pressed from above and deformed by pressing upward from below, the tip of the pipe is guided outwardly and expanded in diameter by the angle. The method for fastening a pipe and a flange member according to any one of claims 2 to 4, characterized in that:   The flange member forms the opening having a step portion including a large-diameter upper step portion and a small-diameter lower step portion with respect to the plate-like flange member base material, and the lower step portion is the first clamping portion. 6. The second clamping part according to claim 2, wherein the second clamping part is formed by pressing a part of a peripheral part of the upper step part downward and inclining inward. The fastening method of the pipe and flange member as described in any one of Claims.

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