JP2007301620A - Method and device of flaring tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and a device of flaring a tube by which the miniaturization of a flaring tool is contrived and the flaring of the tube in heat exchanging parts which are different in size is made possible by making the preparation of the flaring tool unnecessary. <P>SOLUTION: This method is a method of flaring the tube by which both end parts 11a are flared with a pair of the flaring tools 111, 112 to the heat exchanging part 10 in which plates 14 for connecting with a tank are assembled to both end parts 11a in the longitudinal direction of the tubes 11 a plurality of which are stacked, the dimensions in the stacking direction of the tubes of the pair of the flaring tools 111, 112 are set beforehand smaller than the dimensions in the stacking direction of the tubes in the heat exchanging part which are maximum among the heat exchanging parts of objects, both the end parts 11a are simultaneously flared with the pair of the flaring tools 111, 112 and, when unflared parts are generated, simultaneous flaring is repeated to the side of the unflared parts. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a tube widening method and an apparatus for widening the ends of a plurality of tubes inserted through a tank-side plate in a heat exchange section of a heat exchanger.

  2. Description of the Related Art Conventionally, there is a tube expansion device as shown in FIG. 2 that expands a tube end portion of a heat exchange section in a heat exchanger. This tube widening apparatus 100A has a pair of widening jigs 111A and 112A that match the maximum heat exchanging portion dimensions (stacking dimensions of the tubes 11 and fins 12) when producing the heat exchanging portions 10 of various sizes. It has. The magnifying jigs 111 </ b> A and 112 </ b> A are provided with magnifying pins 113 that are arranged at the same pitch as the tube 11 and can be attached and detached.

  When expanding the tube end, the tubes 11 and the fins 12 are alternately stacked, and the side plates 13 are disposed on both outermost sides in the stacking direction, and one tank side plate 14a is driven into the tube 11. All the ends of the tube 11 are expanded simultaneously using one expansion jig 111A. Thereafter, the other tank-side plate 14b is driven into the tube 11, and the end of the tube 11 is expanded all at once using the other expansion jig 112A.

  However, in the above-mentioned tube widening apparatus 100A, the widening jigs 111A and 112A are prepared in accordance with the heat exchanging portion having the maximum dimension, so that the widening is performed on the heat exchanging portion having a small dimension. When it was done, there were unnecessary parts, and the equipment cost was high.

  When expanding the tube of the heat exchanging portion having a smaller dimension than the heat exchanging portion having the maximum dimension, the outer peripheral edge standing portion of the tank side plates 14a and 14b or the tank side Since the widening pin 113 interferes with the protruding portion of the side plate 13 when being through-joined to the plates 14a and 14b, the widening pin 113 serving as the interference portion is removed depending on the dimensions of the heat exchange unit 10. It was necessary to perform setup work such as handling, and this was a bottleneck in improving productivity.

  In view of the above problems, an object of the present invention is to reduce the size of a magnifying jig, and to make a tube magnifying method of a heat exchanging part having a different size without the need for setting up the magnifying jig and It is to provide such a device.

  In order to achieve the above object, the present invention employs the following technical means. The invention described in claims 1 to 3 below relates to a tube widening method, and the invention described in claims 4 to 8 relates to a tube for realizing the tube widening method. The present invention relates to a magnifying device.

  In the first aspect of the present invention, a pair of the heat exchangers (10) in which the tank connection plates (14) are assembled to both ends (11a) in the longitudinal direction of a plurality of stacked tubes (11). Tube squeezing method in which both ends (11a) are squeezed by the squeezing jigs (111, 112) of the pair of squeezing jigs (111, 112). Among the exchange parts, it is set in advance smaller than the tube stacking direction dimension of the maximum heat exchange part, and the pair of magnifying jigs (111, 112) are used to magnify both ends (11a) at the same time, In the case where an unextended portion is generated, the simultaneous expansion is repeated on the unextended portion side.

  Thereby, size reduction of a magnifying jig (111,112) is attained. And by performing swelling including repetition using a small squeezing jig (111, 112), all the heat exchange parts (10) from the heat exchange part having a small dimension to the heat exchange part having the maximum dimension. Therefore, it is possible to improve productivity by eliminating the need for setting up the magnifying jigs (111, 112). That is, the heat exchange part (10) having various dimensions can be produced by randomly flowing.

  The invention according to claim 2 is characterized in that the heat exchanging portion (10) is compressed and held at a predetermined pressure in the tube stacking direction when performing simultaneous expansion.

  Thereby, the position shift of the tube (11) at the time of expanding can be prevented, and expansion with high dimensional accuracy can be implemented.

  The invention according to claim 3 is characterized in that the heat exchanging portion (10) is moved when the simultaneous magnifying is repeated with respect to the undivided portion side.

  The movement of the heat exchanging part (10) can be easily handled by utilizing a normal conveying mechanism that conveys the heat exchanging part (10) from the previous process to the subsequent process. Therefore, a mechanism for moving the magnifying jigs (111, 112) in the tube stacking direction can be eliminated.

  In the invention according to claim 4, the both ends of the heat exchanger (10) in which the tank connection plate (14) is assembled to both ends (11 a) in the longitudinal direction of the tubes (11) to be stacked. In the tube magnifying device including a pair of magnifying jigs (111, 112) that magnify the portion (11a), the dimension of the pair of magnifying jigs (111, 112) in the tube stacking direction is the target heat exchange. Among the parts, the size is set smaller than the dimension in the tube stacking direction of the maximum heat exchanging part, and the pair of widening jigs (111, 112) simultaneously widen both ends (11a) and It is characterized by being formed so as to move relative to the unexpanded portion side and repeat the simultaneous expansion when the expanded portion occurs.

  Thereby, size reduction of a magnifying jig (111,112) is attained, and installation cost can be held down. And by performing swelling including repetition using a small squeezing jig (111, 112), all the heat exchange parts (10) from the heat exchange part having a small dimension to the heat exchange part having the maximum dimension. Therefore, it is possible to improve productivity by eliminating the need for setting up the magnifying jigs (111, 112). That is, the heat exchange part (10) having various dimensions can be produced by randomly flowing.

  The invention according to claim 5 is characterized in that it has a holding part (120) for compressing and holding the heat exchanging part (10) at a predetermined pressure in the tube stacking direction.

  Thereby, it is possible to prevent the positional deviation of the tube (11) at the time of magnifying and when magnifying, and to perform magnifying with high dimensional accuracy.

  In invention of Claim 6, it has a conveyance part (130) which conveys a heat exchange part (10) in a tube lamination direction, and a heat exchange part (10) is conveyed by a conveyance part (130), Relative movement between the pair of magnifying jigs (111, 112) and the unmagnified part side is performed.

  Thereby, the conveyance part (130) can be easily formed using the normal conveyance mechanism which conveys the heat exchange part (10) from the pre-process to the post-process. ), It is possible to eliminate the need for a mechanism for moving the magnifying jigs (111, 112) in the tube stacking direction, thereby further reducing the equipment cost.

  The invention according to claim 7 is characterized in that it has a plate assembling part for assembling the plate (14) to both ends (11a).

  If the assembly of the heat exchanging part (10) including the plate (14) is performed in the previous step of the tube expansion process, the plate (14) is used if the predetermined cycle time is exceeded. By incorporating this assembly into the widening process, it is possible to adjust the balance of cycle times in the preceding and following processes.

  In the invention according to claim 8, in addition to the pair of magnifying jigs (111, 112), other magnifying devices that enable simultaneous magnifying and simultaneous magnifying for tubes of different specifications. It is characterized by having a tool.

  As a result, it is possible to produce the heat exchange parts with different tube specifications without the need for setting up the magnifying jig.

  In addition, the code | symbol in the bracket | parenthesis of each said means shows a corresponding relationship with the specific means of embodiment description mentioned later.

(First embodiment)
Hereinafter, the tube widening apparatus 100 in this embodiment is demonstrated using FIG.

  First, the heat exchange part 10 of the heat exchanger handled by the tube widening apparatus 100 will be briefly described. The heat exchanger here is an intercooler that cools the intake air drawn into the vehicle engine. A heat exchanging portion (hereinafter referred to as a core portion) 10 of the intercooler is a portion for exchanging heat between intake air flowing inside and outside air (outside air), and includes a tube 11, fins 12, side plates 13, and core plates. 14. Each of these members 11 to 14 is made of aluminum or an aluminum alloy.

  The tube 11 is a flat tube member in which a cross section perpendicular to the longitudinal direction is formed in a flat shape, and the fin 12 is a heat radiating member formed in a corrugated shape from a thin strip plate material by roller processing. The side plate 13 is a reinforcing member having a U-shaped cross section perpendicular to the longitudinal direction, and the core plate 14 has an edged portion formed on the outer periphery, and an end in the longitudinal direction of the tube 11 (hereinafter, It is a tank connecting plate member having a tube hole formed at a position corresponding to the tube end portion 11a.

  A plurality of the tubes 11 and the fins 12 are alternately stacked, and a side plate 13 is disposed on the outermost side of the stacked outermost fins 12, and a tube end 11 a is formed in the tube hole of the core plate 14. Is inserted and formed as an assembly of the core portion 10.

  Usually, the core portion 10 is provided with a predetermined level for the number of tubes, the length in the tube longitudinal direction, the fin pitch, etc., and the cooling performance is varied according to the physique and fin pitch. It is set so as to be compatible with various vehicle engines of different types. For example, the number of tubes is increased in steps from a minimum of 9 to a maximum of 39 cores 10. Hereinafter, the dimension corresponding to the dimension of the core portion 10 in the tube stacking direction is referred to as a core size.

  This tube widening apparatus 100 increases the adhesion between the tube 11 and the tube hole of the core plate 14 by expanding the tube end portion 11a of the assembly of the core portion 10, and is performed in the subsequent steps. This improves the brazing property between the tube 11 and the core plate 14 in the integral brazing of the core portion 10 to be performed.

  The tube widening device 100 is formed with a pair of widening jigs 111 and 112, a core holding part 120, a transport part 130, a plate assembly part (not shown), and the like.

  The widening jigs 111 and 112 are elongated block-like jigs that are arranged so as to face the respective core plates 14 and extend in the tube stacking direction, and have a wedge-shaped mouth that protrudes toward the tube end portion 11a. A plurality of expansion portions 111a and 112a are provided. Here, the length of the magnifying jigs 111 and 112 in the tube stacking direction corresponds to the minimum core size of the core portion 10 (9 tubes). Each of the widening portions 111a and 1112a is provided by nine.

  The widening jigs 111 and 112 are slid in the longitudinal direction of the tube by driving means such as a servo mechanism (not shown). That is, the magnifying jigs 111 and 112 have a position that is a predetermined distance away from the core plate 14 as a reference position (the state of FIG. 1), and from the reference position toward the core plate 14, The tube 112a moves until a predetermined amount enters each tube end portion 11a, and then returns to the reference position.

  The core holding part 120 compresses and holds the core part 10 with a predetermined pressure in the tube stacking direction, and is formed by providing the base 123 with the first arm part 121, the second arm part 122, and the like.

  The base 123 is an elongated flat plate member formed so as to correspond to the core portion 10, and has a long side direction (tube stacking direction) dimension set a predetermined amount larger than the maximum core size, and a short side direction (tube longitudinal direction). Direction dimension) is set to be approximately equal to the core portion 10.

  The first arm portion 121 is composed of two prismatic members, and a pressing portion 121 a is provided on one tip side, and the other tip portion is fixed to one end side of the base 123. The holding part 121a is made of a prismatic member and is connected so as to be orthogonal to the two first arm parts 121, and can be inserted into the U-shaped cross section of the side plate 13 of the core part 10. ing.

  Similar to the first arm portion 121, the second arm portion 122 is composed of two prismatic members, and a holding portion 122 a is provided on one tip side, and the other tip portion is on the other end side of the base 123. It is connected to the provided screw shaft 122b. The presser part 122a is formed of a prismatic member like the presser part 121a, and is connected so as to be orthogonal to the two second arm parts 122, and the U-shape of the side plate 13 of the core part 10 is. Can be inserted into the cross section.

  The screw shaft 122b is disposed such that its axial direction is directed to the long side direction of the base 123, and is supported so as to be rotatable with respect to the base 123, and is rotationally driven by a servo motor 122c. Yes. At the other end of the second arm portion 122, a female screw portion is formed so as to penetrate in the long side direction of the base 123, and the screw shaft 122b is screwed into and inserted into the female screw portion. Therefore, the second arm portion 122 moves to the core portion 10 side with the rotational drive (for example, forward rotation) of the screw shaft 122b, and sandwiches both side plates 13 between the presser portion 121a and the presser portion 122a. The core 10 is compressed and held at a predetermined pressure. When the screw shaft 122b is rotationally driven in the reverse direction, the second arm portion 122 moves to the side opposite to the core portion and releases the compression holding of the core portion 10.

  The transport unit 130 transports the core unit 10 held by the core holding unit 120 from the front process side to the back process side, and when the tube widening is performed, the longitudinal direction of both the mouth expansion jigs 111 and 112 It has a function of sequentially feeding an amount corresponding to the dimension. The transport unit 130 includes a block 131 and a screw shaft 132 fixed to the base 123.

  The block 131 is fixed substantially at the center of the base 123, and is formed so that a female screw portion penetrates in the long side direction of the base 123. And the screw shaft 132 is screwed and inserted in this internal thread part. The screw shaft 132 is rotationally driven by a servo motor (not shown), and the block 131 moves in the axial direction of the screw shaft 132 by this rotational driving. That is, the core transport unit 120 and the core unit 10 fixed to the block 131 move. By intermittently rotating the screw shaft 132, the core portion 10 can be fed forward.

  Next, the operation of the tube widening device 100 based on the above configuration will be described.

  First, there is a core assembling process by a core assembling machine as a pre-process for expanding the tube mouth, where the tube 11, the fins 12, and the side plates 13 are assembled. The assembled body is compressed and held at a predetermined pressure in the tube stacking direction by both side plate 13 portions by the holding portions 121 a and 122 a of the core holding portion 120, and is conveyed to the tube widening device 100.

  In the tube widening device 100, the core plate 14 is driven into both the tube end portions 11a by a plate assembly portion (not shown) to form a complete assembly of the core portion 10.

  The one end side of the core portion 10 in the tube stacking direction is positioned so as to correspond to the first and second widening jigs 111 and 112 (reference positions) while being held by the core holding portion 120. Tube expansion is performed by the both-mouth expansion jigs 111 and 112. That is, both the mouth widening jigs 111 and 112 move together to the opposite core plate 14 side, and simultaneously widen the tubes 11 corresponding to the number of the mouth widening portions 111a and 112a (here, nine). Do. Then, the double-sided expansion jigs 111 and 112 return to the reference position side, and accordingly, the core unit 10 is moved in the direction of the arrow in FIG. 111, 112). The amount of movement at this time is equivalent to the number of tubes 11 that have been expanded.

  In the same manner as described above, the tube expansion and the conveyance (sequential feed) of the core portion 10 are repeated, and the unexpanded portions are sequentially expanded to complete the total number of tube expansions. Then, the core portion 10 whose tube opening has been completed is transported to a subsequent process by the transport portion 130.

  As described above, in the tube widening apparatus 100 of the present embodiment, the tube stacking direction dimensions of the widening jigs 111 and 112 are set smaller than the maximum core size of the target core unit 10. Here, it is set according to the minimum core size. Since both the tube end portions 11a are simultaneously expanded by the pair of expansion tools 111 and 112 and the simultaneous expansion is sequentially repeated with respect to the non-expanded portion side, 111 and 112 can be downsized, and the equipment cost can be reduced. And by carrying out magnifying, including repetition, using small both-side magnifying jigs 111 and 112, it is possible to calibrate all the core parts 10 from the core part 10 having a small dimension to the core part 10 having the largest dimension. Since expansion is possible, it is not necessary to set up the two-mouth expansion jigs 111 and 112, and productivity can be improved. That is, the core part 10 having various dimensions can be produced by randomly flowing.

  In addition, since the core portion 10 is expanded by the core holding portion 120 while being compressed and held at a predetermined pressure in the tube stacking direction, the tube portion is expanded from the previous step to the tube opening. It is possible to prevent the positional deviation of the tube 11 at the time of expansion, and to perform widening with high dimensional accuracy.

  Further, when the tube expansion is performed for the second and subsequent times with respect to the unexpanded portion after the first tube expansion, the core unit 10 side is conveyed by the conveying unit 130 with respect to both the mouth expanding jigs 111 and 112. The relative movement is done with. Thereby, the conveyance part 130 can be easily formed using the normal conveyance mechanism which conveys the core part 10 from the pre-process to the post-process, and the double-mouth expansion as the tube widening device 100 correspondingly. Since a mechanism for moving the tools 111 and 112 in the tube stacking direction can be eliminated, the equipment cost can be further reduced.

  Here, a plate assembling portion is provided in the tube widening device 100 to assemble the core plate 14. If the core portion 10 including the core plate 14 is assembled in the previous step of the tube expansion process for expanding the tube, if the predetermined cycle time is exceeded, the assembly of the core plate 14 is expanded. By incorporating it into the process, it is possible to adjust the balance of cycle times in the preceding and following processes. On the contrary, if there is no problem in the cycle time in the previous process, the core plate 14 may be assembled in the previous process and the assembly may be expanded only by the tube expansion apparatus 100.

(Second Embodiment)
In the said 1st Embodiment, although the cross-sectional shape of the tube 11 demonstrated the case where the core part 10 which consists of one type of specification was assumed, since the both-mouth expansion jigs 111 and 112 can be set small, other specifications are used. Both mouth opening jigs 111 and 112 are used as a mouth opening jig (other mouth opening jigs) for expanding the tube mouth with respect to a core portion using a tube, for example, a tube having a flat cross section having different dimensions in the long side direction. You may provide so that it may be attached to. As a result, it is possible to produce the magnifying jig with no need for setup of the magnifying jig for the core parts having different tube specifications.

(Other embodiments)
In the first embodiment, when the tube opening is sequentially repeated, the core unit 10 side is sequentially fed by the transport unit 130. However, the present invention is not limited to this, and the core unit 10 side is stopped, and both the opening of the mouth is expanded. The jigs 111 and 112 may be sequentially fed in the tube stacking direction.

  In addition, when the tube expansion is repeated sequentially, depending on the number of tubes of the core portion 10, if the number of the expansion portions 111 a and 112 a of the double-expansion jigs 111 and 112 does not become a multiple of the number, The widened portions 111a and 112a may be inserted into the widened tube again at the next stage. In this case, only the widened portions 111a and 112a are inserted into the tube end portion 11a that has already been widened, and there is no practical problem, and tube widening to the core portion 10 having various different core sizes is possible. Become.

It is a perspective view which shows the tube widening apparatus in 1st Embodiment. It is a perspective view which shows the tube opening apparatus in a prior art.

Explanation of symbols

10 Core part (Heat exchange part)
11 tube 11a end 14 core plate (plate for tank connection)
100 Tube expansion device 111 First expansion device (mouth expansion device)
112 Second magnifying jig (mouth magnifying jig)
120 Core holding part (holding part)
130 Transport section

Claims (8)

A pair of magnifying jigs (111, 112) with respect to the heat exchanging part (10) in which the tank connection plate (14) is assembled to both ends (11a) in the longitudinal direction of the tubes (11) to be stacked in plural. ) To widen the both ends (11a),
The tube stacking direction dimension of the pair of magnifying jigs (111, 112) is set in advance to be smaller than the tube stacking direction dimension of the maximum heat exchange part among the target heat exchange parts,
The pair of magnifying jigs (111, 112) simultaneously magnify the both end portions (11a), and when the magnifying portion is generated, the simultaneous magnifying device side is expanded with respect to the magnifying portion side. The tube widening method characterized by repeating.   The tube squeezing method according to claim 1, wherein the heat exchange part (10) is compressed and held at a predetermined pressure in the tube stacking direction when performing the simultaneous squeeze.   The tube squeezing method according to claim 1 or 2, wherein the heat exchanging part (10) is moved when the simultaneous squeezing is repeated with respect to the unexpanded part side. The both end portions (11a) are expanded with respect to the heat exchanging portion (10) in which the tank connection plates (14) are assembled to both end portions (11a) in the longitudinal direction of the tubes (11) to be stacked. In a tube magnifying device comprising a pair of magnifying jigs (111, 112),
The tube stacking direction dimension of the pair of magnifying jigs (111, 112) is set to be smaller than the tube stacking direction dimension of the maximum heat exchange part among the target heat exchange parts,
The pair of magnifying jigs (111, 112) magnify both end portions (11a) at the same time and move relative to the side of the magnifying part when the magnifying part is generated. Then, the tube magnifying device is formed so as to repeat the simultaneous magnifying.   The tube widening device according to claim 4, further comprising a holding portion (120) for compressing and holding the heat exchange portion (10) at a predetermined pressure in the tube stacking direction. A transport section (130) for transporting the heat exchange section (10) in the tube stacking direction;
When the heat exchanging unit (10) is conveyed by the conveying unit (130), a relative movement between the pair of magnifying jigs (111, 112) and the unextended portion is performed. The tube widening apparatus according to claim 4 or 5, characterized in that   The tube widening device according to any one of claims 4 to 6, further comprising a plate assembly portion for assembling the plate (14) to the both end portions (11a).   In addition to the pair of magnifying jigs (111, 112), the magnifying glass has other magnifying jigs that allow the simultaneous magnifying and the simultaneous magnifying to be repeated for tubes having different specifications. The tube magnifying device according to any one of claims 4 to 7.

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