JP2006289481A - Heat exchanger and its production method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger which can reduce material cost and energy cost and has stable quality, and also to provide a production method therefor. <P>SOLUTION: The heat exchanger is provided with a core 15 having a tube 1 through which fluid flows and a tank 3 which is communicated with the inside of the tube 1 and mounted at an end of the tube 1 in a longitudinal direction. Friction stir joining is used for forming at least one of the components of the core 15. Since the friction stir joining is used to form the components of the core 15, the heat exchanger reduces material consumption and energy consumption and is excellent in cost performance and quality. The production method for the same is also provided. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a heat exchanger having at least a tube through which a fluid flows and a tank provided at a longitudinal end portion of the tube, and a manufacturing method thereof.

Conventionally, in this type of heat exchanger, a first header, a second header, a plurality of tubes that exchange heat between the first fluid flowing inside and the air passing outside, and the outside of the plurality of tubes. Provided in contact with the wall surface and provided with fins for increasing the efficiency of heat exchange between the first fluid and air, and these components are clad in the first header, the second header, and the plurality of tubes. What is joined by brazing integrally in a furnace with a brazing material is known (for example, see Patent Document 1).
Japanese Patent Laid-Open No. 2004-3787 (FIG. 1)

  However, the above-described conventional heat exchanger has a problem that it is necessary to assemble parts for brazing between parts to be brazed in the furnace.

  This invention is made | formed in view of the said problem, and it aims at providing the heat exchanger which reduced the usage-amount of the brazing material, and its manufacturing method.

  In order to achieve the above object, the present invention employs the following technical means.

The invention of the heat exchanger according to claim 1 includes a tube (1) through which a fluid flows, and a tank provided at the longitudinal end of the tube (1) in communication with the inside of the tube (1). A heat exchanger with a core (15) having 3),
Friction stir welding is used in forming at least one of the core (15) components.

  According to the first aspect of the present invention, the friction stir welding is used when forming the core component parts, so that the overlap of the joining parts of the component parts is not provided or the overlap margin is made as small as possible. By adopting a configuration in which the joint portions are abutted with each other, the amount of material can be reduced. Moreover, since it can simplify also about the structure which fixes a junction part, a manufacturing man-hour can be reduced.

  The invention of the heat exchanger according to claim 2 is characterized in that the tank (3) is made of a plate material, and friction stir welding is used for joining the plate material.

  According to the second aspect of the present invention, since the friction stir welding is used for forming the tank, the tank can be molded with low energy, which greatly contributes to cost reduction.

  According to a third aspect of the present invention, the tank (3) includes a main body and a cap (6) that seals an end thereof, and the cap (6) and the main body are frictional. It is characterized by being joined using stirring joining.

  According to the third aspect of the present invention, it is not necessary to provide a caulking claw portion on the cap, and it is possible to realize reduction of material, prevention of brazing failure due to caulking failure, and the like.

  The invention of the heat exchanger according to claim 4 includes a tube (1) through which a fluid flows, and a tank provided at an end portion in the longitudinal direction of the tube (1) in communication with the inside of the tube (1). 3) having a core (15) having an accessory tank (9) provided in communication with the inside of the tank (3), the accessory tank (9) having an end thereof An accessory tank cap (11) for sealing the part is provided, and the accessory tank and the accessory tank cap (11) are joined using friction stir welding.

  According to the fourth aspect of the present invention, since the caulking structure is not required for the connection between the attached tank and the attached tank cap, it is possible to prevent brazing failure due to caulking failure, reduce the material, and the like.

  The invention of the heat exchanger according to claim 5 includes a tube (1) through which a fluid flows, and a tank provided at the longitudinal end of the tube (1) in communication with the inside of the tube (1). 3), and an attached tank assembly (5) communicating with the inside of the tank (3), wherein the attached tank assembly (5) and the tank (3) It is characterized in that it is joined using friction stir coupling directly or via a joining part (12) connecting both.

  According to the invention described in claim 5, since each of the accessory tank assembly and the tank, or the joining component, and the accessory tank assembly and the tank are joined by friction stir welding, it is not necessary to provide a caulking portion on the accessory tank assembly or the joining component. Reduction of material costs and prevention of brazing failure due to caulking failure can be realized.

  The invention of the heat exchanger according to claim 6 includes a tube (1) through which a fluid flows, and a tank provided at the longitudinal end of the tube (1) in communication with the inside of the tube (1). 3), a heat exchanger provided with a core (15) having an accessory tank (9) provided in communication with the inside of the tank (3) and a female screw (10) attached to the accessory tank (9). ) Is characterized by being joined using friction stir welding.

  According to the sixth aspect of the present invention, since the caulking structure is not required for the connection between the accessory tank and the female screw, it is possible to prevent brazing failure due to caulking failure, reduce the material, and the like.

  The invention of the heat exchanger according to claim 7 is characterized in that a bracket (13) for attaching to a vehicle or a part assembled to the vehicle is joined by friction stir welding.

  According to the seventh aspect of the present invention, the energy consumption due to the coupling can be reduced by using friction stir welding instead of using welding for coupling the brackets.

  The invention of the heat exchanger according to claim 8 includes a tube (1) through which a fluid flows, and a tank provided at the longitudinal end of the tube (1) in communication with the inside of the tube (1). 3), characterized in that friction stir welding is used to form the tube.

  According to the invention described in claim 8, it is possible to improve the joining quality of the tube and prevent defective products.

  The invention of the heat exchanger manufacturing method according to claim 9 is arranged at a longitudinal end portion of the tube (1) in communication with the inside of the tube (1) through which the fluid flows and the inside of the tube (1). A heat exchanger manufacturing method comprising a core (15) having a tank (3), comprising: a core assembling step for assembling the core (15); and a step of brazing in a furnace. Friction stir welding is used for forming the component parts or joining the component parts before the in-furnace brazing step.

  According to the ninth aspect of the present invention, by performing the friction stir welding before the in-furnace brazing step, it is possible to reduce the overlap margin for performing the desired brazing in the in-furnace brazing step. , Greatly contribute to cost reduction.

  The invention of the heat exchanger manufacturing method according to claim 10 is arranged at a longitudinal end portion of the tube (1) in communication with the inside of the tube (1) through which the fluid flows and the inside of the tube (1). A heat exchanger having at least a tank (3), wherein friction stir welding is used for forming the components or joining the components in the heat exchanger. Friction generated by agitating terminals provided with a shoulder portion (16A) and a pin portion (17A) rotating on the concentric shaft together with the shoulder portion (16A) in press contact with an object to be joined in the axial direction. By fluidizing the structure of the object to be bonded by heat and separating the stirring terminal from the object to be bonded, a solidified bonding region is formed on the object to be bonded, and the bonding region is formed. To the pin portion (17A) is characterized thereby movable in the axial direction away from the object to be bonded to said shoulder portion (16A).

  According to the tenth aspect of the present invention, when the joining region is formed, the pin portion is pulled out of the object to be joined, and then the shoulder portion is pulled out, so that the pin portion is solidified by press-fitting. Since the depth of the hollow formed in the previous joining region can be reduced, the thickness of the solidified joining region is increased, and the strength of the object to be joined can be further improved.

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

(First embodiment)
An embodiment of the present invention will be described. FIG. 1 is a process diagram showing a manufacturing process of a heat exchanger in the present embodiment. FIG. 2 is a schematic diagram showing the configuration of the heat exchanger in the present embodiment. FIG. 3 is a process diagram showing a process of friction stir welding in the present embodiment. FIG. 4 is a side view showing the movement in the tank longitudinal direction of the stirring terminal in the friction stir welding shown in FIG. FIG. 5 is a cross-sectional view showing a configuration in which a modulator tube (attached tank) and a modulator cap (attached tank cap) are coupled using friction stir welding in the present embodiment. FIG. 6 is a cross-sectional view showing a configuration in which a modulator tube (attached tank) and a female screw are coupled using friction stir welding in the present embodiment. FIG. 7 is a front view showing a configuration in which the modulator tube (attached tank) and the tank are coupled to each other through a plate (joined part) using friction stir welding in the present embodiment. FIG. 8 is a view taken along the line AA in FIG. FIG. 9 is a cross-sectional view showing a configuration in which the tank and the cap are coupled using friction stir welding in the present embodiment. FIG. 10 is a perspective view showing a place where the friction stir welding is performed in FIG. 9. FIG. 11 is a cross-sectional view showing a configuration in which a tank or a modulator pipe (attached tank) and a bracket are coupled using friction stir welding in the present embodiment. FIG. 12 is a schematic diagram illustrating a place where the friction stir welding is performed in FIG. 11. FIG. 13 is a cross-sectional view showing a step of joining the bracket and the side plate using friction stir welding before the in-furnace brazing step. FIG. 14 is a perspective view showing a state after the bracket and the side plate are joined using the friction stir welding before the brazing step.

  The heat exchanger according to the present embodiment is used for a vehicle air conditioner, a refrigerator car or a refrigerator used in a low temperature environment to maintain the inside temperature at a low temperature, an engine cooling radiator, etc. Used as a condenser for refrigeration cycle equipment. This heat exchanger is attached to parts on the vehicle side via a side plate or the like so as not to be affected by the vibration of the vehicle. The heat exchanger has at least a tube through which a fluid flows and a tank provided at a longitudinal end portion of the tube. The heat exchanger comprises a single tube providing a single passage therein, a single tube providing a plurality of passages therein, or a plurality of tubes providing a single passage or multiple passages therein. Can do. Further, the heat exchanger can include a tank as a connection member between the tube and the external pipe. The tank provides a chamber for supplying fluid to single or multiple passages provided by single or multiple tubes. If multiple passages are provided, the tank provides a distribution chamber or a collection chamber. The components of the heat exchanger include a bracket for supporting and fixing the heat exchanger, in addition to components such as tubes, tanks, and accessory tanks as members that define the fluid passages. These components may be configured by joining a plurality of members in order to obtain their required shapes, and friction stir welding may be used to join these members. Moreover, in order to join these components and obtain the form as a heat exchanger, friction stir welding may be used. When the joint formed in the friction stir welding process is provided as a final joint of these components or heat exchanger, or as a preliminary joint of these components or heat exchanger There is. For example, the joint formed in the friction stir welding process can provide a joint for a temporary assembly of components or a heat exchanger, and can form a final joint in addition to the joint. For example, joints can be formed by brazing or welding with heat to provide high strength or fluid sealing.

  As shown in FIGS. 1 and 2, the manufacturing process of the heat exchanger of the present embodiment is a core assembling process in which the tube 1, the fin 2, the tank 3, and the side plate 4 are assembled to generate the core 15 of the heat exchanger. And the other assembly process in which the modulator assembly 5 as the attached tank assembly, the cap 6, the connector 7, and the bracket 8 are attached to the core 15, and in the furnace for fixing the assembly obtained in the other assembly process. And brazing process. The modulator assembly 5 includes a modulator tube 9 as an accessory tank, a female screw 10 and a modulator cap 11 as an accessory tank cap. A plate 12 as a joining part attaches the modulator assembly 5 to the tank 3 on the core 15 side. Used to connect.

  The configuration of the core 15 will be described. The core 15 includes at least a plurality of tubes 1 through which a first fluid (a refrigerant in the present embodiment) flows, and a tank 3 that is disposed at an end in the longitudinal direction of the tube 1 and communicates with the inside of the tube 1. Is done. In addition, the material of each component explained below of the heat exchanger including the tube 1 and the tank 3 is a highly conductive metal such as copper, copper alloy, aluminum, aluminum alloy, and particularly aluminum and aluminum alloy. use.

  The core 15 is arranged between the tanks 3A and 3B in which the plurality of tubes 1 are arranged between the tanks 3A and 3B so as to be orthogonal to each other, and both ends of the plurality of tubes 1 are arranged on both sides. 3A, 3B and the inside of the tube 1 are connected so as to communicate with each other. The tube 1 is a thin-walled tubular member, and the cross section perpendicular to the longitudinal direction has an annular shape or a flat shape.

  As shown in FIG. 2, fins 2 that are heat transfer members for increasing heat exchange efficiency are arranged between these tubes 1, and the tubes 1 and fins 2 are alternately arranged in the longitudinal direction of both tanks 3 </ b> A and 3 </ b> B. Is arranged. The plurality of fins 2 are thin plate-like members, and are formed in a wave shape or a zigzag shape so that a part thereof is in contact with the wall surface of the adjacent tube 1. A second fluid (air in the present embodiment) that exchanges heat with the first fluid flows outside the tubes 1 and the fins 2.

  Both tanks 3 </ b> A and 3 </ b> B are cylindrical containers, have a length dimension that allows communication with all of the plurality of tubes 1, and a state in which the tubes 1 are inserted into a plurality of insertion holes formed respectively. In the furnace brazing step shown in FIG. A connector 7A to which an introduction pipe for introducing the first fluid is connected is connected to the tank 3A, and the tank 3A and the connector 7A are coupled together by brazing in the furnace brazing process. The tank 3B is connected to a connector 7B to which a lead-out pipe for sending the first fluid to the other components of the refrigeration cycle is connected. The tank 3B and the connector 7B are integrally brazed in the in-furnace brazing process. Are combined.

  Side plates 4A and 4B are perpendicular to both tanks 3A and 3B at the outermost ends in the stacking direction of tubes 1 and fins 2 arranged alternately with respect to core 15 formed in this way. The side plates 4A and 4B are connected to the tube 1 and the fins 2 by temporarily fixing and integrally brazing in the furnace brazing process. The side plates 4A and 4B have a function of securing the strength of the core 15 after brazing and a function of supporting and fixing an attachment member such as a bracket when the core 15 is attached to a vehicle-side component.

  In this embodiment, friction stir welding (including Friction Stir Welding (abbreviation FSW), Friction Spot Joining (abbreviation FSJ), etc.) is used in the formation of the tanks 3A and 3B. The friction stir welding referred to in the present embodiment broadly includes a joining technique in which the inside of the structure of the article to be joined is stirred and fluidized by friction heat while keeping the solid state without melting the article to be joined.

  As shown in FIG. 3, a thin plate-like tank material is formed into a predetermined shape, and held in a form in which the end corresponding to the joint is abutted. The holding form at this time is a tubular form in which the joint portion is formed over the length in the longitudinal direction of the tanks 3A and 3B, and both end portions in the longitudinal direction are opened. The cross section perpendicular to the longitudinal direction of the tubular form is a rectangular tubular shape in the present embodiment, but may be a circular tubular shape or an elliptical tubular shape. In order to maintain this holding form, both side surfaces of the tank are pressed in the direction in which the end portions corresponding to the joint portions are abutted with each other. A pressing jig such as a vise is used for this pressing.

  An embodiment will be described in which the joint portion is joined by friction stir welding in the tank material held in such a form that the joint portions are brought together. As shown in FIG. 3, this step is mainly composed of three steps: (a) press-fitting, (b) joining, and (c) drawing. The stirring terminal used for the friction stir welding includes a cylindrical shoulder portion 16 and a pin portion 17 which is disposed so as to protrude on the concentric shaft of the shoulder portion 16 and rotates together with the shoulder portion 16.

  The shoulder portion 16 is mounted on a holding tool (not shown) and installed so as to vertically contact the joint portion. The holder is moved by rotation driving means for rotating the holder and displacement driving means for displacing the holder in the axial direction, and the movement by control means for controlling the rotation driving means and the displacement driving means. Is controlled. When the holder is rotated and moved in the direction of the joint, and the pin portion 17 protruding from the shoulder portion 16 that rotates together with the holder is brought into contact with the joint, the rotating pin portion 17 and the Friction heat is generated between the joint portion, the tank 3 material is softened, and the pin portion 17 is press-fitted into the tank material (the above (a) press-fitting step).

  Next, after the pin portion 17 is buried in the tank 3 material and the shoulder surface 16a formed on the end surface on the pin portion 17 side of the shoulder portion 16 contacts the tank 3 material, the pressing force to the stirring terminal is maintained for a predetermined time. To do. The pin portion 17 is buried in the tank 3 material until the tip of the pin portion 17 does not exceed the inner end of the tube applied to the butted portion of the tank 3, that is, the tip of the pin portion 17 penetrates the tubular tank 3. In order to avoid this, it is desirable to displace the holder and form the joining region 19 as deeply as possible (above, (b) joining step).

  Further, when the stirring terminal is rotated and separated from the tank 3 material, the joining region 20 is cooled and solidified, and the butt portion of the tank 3 material which is the object to be joined is joined by the joining region 20 (above). (C) Drawing process).

  The above-described three steps for the friction stir welding explain the step of partially joining the objects to be joined. In joining the tank 3, as shown in FIG. 4, in addition to these three steps, a moving step of moving the stirring terminal is performed along the entire abutting portion extending in the longitudinal direction of the tank 3. Specifically, a moving step is performed in which the stirring terminal is moved by a predetermined distance in the longitudinal direction of the tank 3, and (c) a drawing step is performed after this moving step. Then, again, (a) press-fitting, (b) joining, moving process, and (c) drawing process are repeated to perform friction stir welding over the entire butt portion.

  Next, the process of assembling other components on the core 15 will be described together with the configuration of the other components.

  Other components assembled to the core 15 are the modulator assembly 5, the cap 6, the connector 7, and the bracket 8 described above.

  First, the process of assembling the modulator assembly 5 will be described. The modulator assembly 5 is configured by assembling a modulator cap 11 and a female screw 10 to a modulator tube 9.

  As shown in FIG. 5, the process of assembling and joining the modulator cap 11 to the modulator tube 9 will be described. A modulator cap 11 is attached to the opening on one end side of the tubular modulator tube 9 to seal the end of the modulator tube 9 and perform friction stir welding. While the pin portion 17 of the terminal is rotated, it is press-fitted from the axial direction of the modulator tube 9. The press-fitting depth at this time extends to the position exceeding the end face of the modulator tube 9 through the thickness near the outer peripheral edge of the modulator cap 11, and a joining region is formed so that the modulator cap 11 and the modulator tube 9 are integrated. It will be done. When the joining region is formed, the pin portion 17 is pulled out, and the joining region is cooled and fixed. The joint region thus fixed is formed in a spot shape at a plurality of locations on the outer peripheral edge of the modulator cap 11. By performing the friction stir welding as described above, the modulator cap 11 is securely fixed to the modulator tube 9, and the outer peripheral edge of the modulator cap 11 that is not subjected to the friction stir welding is brazed in the furnace. By the brazing joining in the attaching process, the modulator cap 11 completely seals the modulator tube 9. The modulator tube 9 integrates the tank 3B with the core 15, and has a function of storing a refrigerant that is the first fluid in the present embodiment. The modulator tube 9 is a gas that flows into the modulator tube 9 from the tank 3B. Of the liquid refrigerant, the gas phase refrigerant and the liquid phase refrigerant are separated, and the liquid phase refrigerant is sent to the tank 3B.

  Next, the process of assembling and joining the female screw 10 to the modulator tube 9 will be described. As shown in FIG. 6, in order to perform friction stir welding by inserting a female screw 10 into the other end side opening of the tubular modulator tube 9, the outer surface of the modulator tube 9 at the position where the female screw 10 is inserted is provided. Then, the pin portion 17 of the agitation terminal is pressed in from the direction perpendicular to the axial direction of the modulator tube 9 while rotating. The press-fitting depth at this time reaches the position passing through the outer peripheral surface of the modulator tube 9 and exceeding the outer peripheral surface of the female screw 10, and a joining region is formed so that the female screw 10 and the modulator tube 9 are integrated. . When the joining region is formed, the pin portion 17 is pulled out, and the joining region is cooled and fixed. The joint regions thus fixed are formed in a spot shape at a plurality of locations on the outer peripheral surface of the modulator tube 9.

  By performing the friction stir welding as described above, the female screw 10 is securely fixed to the modulator tube 9, and the outer peripheral surface of the female screw 10 not subjected to the friction stir welding and the inner peripheral surface of the modulator tube 9. As a result of brazing and joining in the subsequent in-furnace brazing step, the female screw 10 is completely in close contact with the modulator tube 9. The female screw 10 is a tubular cylinder and has a threaded portion formed on the inner tube surface. Then, after performing the other component assembling process described below, the entire heat exchanger is brazed by the brazing process in the furnace, and then a desiccant as a dryer is introduced into the modulator tube 9 from the opening of the female screw 10. After the desiccant is added, the male tube is screwed into the female screw 10 to seal the modulator tube 9.

  Next, a process of connecting the modulator assembly 5 to the tank 3 so as to communicate between the insides will be described. First, the two openings provided in the plate 12, the two openings provided in the tank 3B, and the two openings provided in the modulator pipe 9 are respectively connected between the modulator pipe 9 and the tank 3B. The plate 12 is arranged and connected. As a result, a first path that passes through the modulator pipe 9 from the tank 3B is formed, and a second path that returns from the modulator pipe 9 to the tank 3 is formed. The first path and the second path are partitioned by a separator in the modulator tube 9.

  Friction stir welding is performed through the plate 12 in the modulator tube 9, the plate 12, and the tank 3 </ b> B set in this way. First, as shown in FIGS. 7 and 8, the above-described friction stir welding is performed on the junction between the modulator tube 9 and the plate 12 and the junction between the tank 3 and the plate 12. FIG. 8 is a cross-sectional view taken along the line AA in FIG. 7 and shows a state in which the plate 12 is joined to the modulator tube 9. By rotating the stirring terminal at the joint with the modulator tube 9 at the top of the plate 12 and performing the steps of (a) press-fitting, (b) joining, moving (b) pulling, a joining region 18 having a predetermined length is formed. To form. Similarly, with respect to the tank 3 and the plate 12, a joining region having a predetermined length is formed by rotating the stirring terminal at the joining portion of the tank 3 above the plate 12 and performing the same process.

  In this way, the modulator tube 9 is securely fixed to the tank 3 in a state where it is in communication with the tank 3, and the in-furnace brazing step is performed on the joint portion with the plate 12 not subjected to friction stir welding. As a result of the brazing and joining, the modulator tube 9 is completely communicated with the tank 3 with no leakage.

  In addition, the friction stir welding applied to the joint between the plate 12 and the tank 3 or the modulator tube 9 is performed so as to be formed in a plurality of spots in addition to those having a predetermined length. The same effect can be obtained.

  Further, when the modulator tube 9 and the tank 3 are joined, the modulator tube 9 and the tank 3 may be joined directly by friction stir welding without using the plate 12 as a joining component. In this case, the pin portion 17 sets the position of the agitation terminal so as to contact the abutting portion where the modulator tube 9 and the tank 3 are abutted, and (a) press-fitting, (b) joining, moving (b ) The drawing process is performed.

  Next, the process of assembling and joining the cap 6 to the tank 3 in the other part assembly process will be described. As shown in FIG. 9, a cap 6 is attached to the tubular tank 3 at both end openings, and the tank 6 is rotated while rotating the pin portion 17 of the stirring terminal on the end face near the outer peripheral edge of the cap 6 in order to perform friction stir welding. 3 from the axial direction. The depth of press-fitting at this time passes through the thickness in the vicinity of the outer peripheral edge of the cap 6 and reaches a position exceeding the end face of the tank 3, and a joining region is formed so that the cap 6 and the tank 3 are integrated. To do. When the joining region is formed, the pin portion 17 is pulled out, and the joining region is cooled and fixed. The joint region thus fixed is formed in a spot shape at a plurality of locations on the outer peripheral edge of the cap 6. Further, as shown in FIG. 10, by rotating the agitation terminal at the joint portion with the tank 32 on the outer peripheral edge of the cap 6 and repeating press-fitting, pulling out, and moving, the joining regions 21 and 22 having a predetermined length are obtained. May be formed at a plurality of locations. Further, friction stir welding may be performed over the entire circumference of the joint portion with the tank 32 on the outer peripheral edge of the cap 6.

  By performing the friction stir welding as described above, the cap 6 is securely fixed to the tank 3, and further, the outer peripheral edge portion of the cap 6 that is not subjected to the friction stir welding and the joint portion of the tank 3. The cap 6 completely seals the tank 3 by brazing and joining in the in-furnace brazing process.

  Next, a process of assembling and joining the bracket 13 to the tank 3 or the modulator tube 9 in the other part assembling process will be described. As shown in FIG. 11, the bracket 3 is attached to the outer peripheral surface of the tank 3 or the modulator tube 9, and the tank 3 is rotated while rotating the pin portion 17 of the stirring terminal on the outer peripheral surface of the bracket 13 in order to perform friction stir welding. Alternatively, press-fitting is performed in a direction toward the center of the modulator tube 9. The press-fitting depth at this time reaches the position exceeding the outer peripheral surface of the tank 3 or the modulator pipe 9 through the thickness of the bracket, and a joining region is formed so that the tank 3 or the modulator pipe 9 and the bracket 13 are integrated. I will do it. When the joining region is formed, the pin portion 17 is pulled out, and the joining region is cooled and fixed. As shown in FIG. 12, the joint region thus fixed is formed in a spot shape at a plurality of locations on the outer peripheral surface of the bracket 13. By thus performing friction stir welding, the bracket 13 is securely fixed to the tank 3 or the modulator tube 9.

  Further, as shown in FIG. 13, a configuration in which the bracket 8 is joined to the side plate 4 </ b> B by friction stir welding in the other component assembling process and a manufacturing method thereof will be described.

  The bracket 8 is abutted against the lower end surface of the upper protruding piece of the U-shaped side plate 4B, and the bracket 8 is temporarily inserted by inserting the receiving jig 21 between the lower protruding piece of the side plate 4B and the bracket 8. Fix it. Then, in order to perform friction stir welding for the connection between the bracket 8 and the side plate 4B, the upper end surface of the upper protruding piece in the side plate 4B is rotated perpendicularly to the upper end surface while rotating the pin portion 17 of the stirring terminal. Press fit downward. The press-fitting depth at this time is set to a position that penetrates the upper protruding piece of the side plate 4B and does not reach the lower end surface of the bracket 8 so that the upper protruding piece of the side plate 4B and the bracket 8 are integrated. 18 is formed. When the joining region 18 is formed, the pin portion 17 is pulled out, and the joining region 18 is cooled and fixed. As shown in FIG. 14, the joint region 18 thus fixed is formed in a spot shape at a plurality of locations at the contact portion between the upper projecting piece of the side plate 4 </ b> B and the bracket 8.

  After passing through the core assembly process and other parts assembly process shown above, the entire heat exchanger is put into the furnace and the brazing process in the furnace is performed, and all parts are brazed. Become.

  As described above, according to the present embodiment, the core 15 having the tube 1 through which the fluid flows and the tank 3 provided at the end portion in the longitudinal direction of the tube 1 in communication with the inside of the tube 1 is provided. Among these components, since the friction stir welding is used to form at least one component, the tank 3 and the like can be obtained by using the friction stir welding when forming the core 15 component. It is possible to reduce the amount of material by providing a configuration in which the joining portions of the component parts are not provided, or the overlapping portions are made as small as possible so that the joining portions are brought into contact with each other. Moreover, since it can simplify also about the structure which fixes a junction part, the heat exchanger which can reduce a manufacturing man-hour is obtained. Further, since the joining can be performed at a low temperature, a more stable product shape of the tank can be obtained as compared with the case where it is fixed by welding.

  The tank 3 is made of a plate material. When the plate material is joined at the time of forming the tank shape by friction stir welding, the tank 3 is formed by using the friction stir welding. Since it can be formed by processing a plate material without forming the product, it greatly contributes to the cost reduction of the tank material.

  Further, a cap 6 is provided that is attached to an end of a cylindrical tank main body constituting the tank 3 to cover the end opening of the tank main body and seal the end opening in a liquid-tight manner. When the cap 6 and the tank 3 for sealing the tank 3 are joined by friction stir welding, a caulking claw portion is formed on the cap 6 and caulked to the tank, or the caulking claw is attached to the cap 6. It is not necessary to provide a portion, and it is possible to prevent brazing failure due to caulking failure, reduce material, and the like.

  Further, a core 15 having a tube 1 through which fluid flows, a tank 3 provided at the longitudinal end of the tube 1 in communication with the inside of the tube 1, and a modulator assembly 5 in communication with the inside of the tank 3. When the components constituting the modulator assembly 5 are joined together by friction stir welding, the number of man-hours in the step of forming the caulking claw portion on the component constituting the modulator assembly 5 is reduced. Reduction, yield reduction by caulking process, prevention of brazing failure due to caulking failure, weight reduction of material, etc. can be realized.

  In addition, a core 15 having a tube 1 through which fluid flows, a tank 3 that communicates with the inside of the tube 1 and is provided at an end in the longitudinal direction of the tube 1, and a modulator assembly 5 that communicates with the inside of the tank 3. In the case where the modulator assembly 5 and the tank 3 are coupled by applying a friction stir coupling through the plate 12 connecting the modulator assembly 5 and the tank 3, the plate 12 and the modulator assembly 5 and the plate 12 and the tank 3 are connected. 3 are joined together by friction stir welding, so that it is not necessary to provide a caulking claw portion on the plate 12, and it is possible to prevent brazing defects due to caulking defects, and to excel in terms of quality and cost. A vessel is obtained.

  When friction stir welding is used to connect the bracket 13 for fixing the core 15 to the vehicle and the modulator assembly 5 or the tank 3, the bracket 13, the modulator assembly 5 or the tank is used. In the connection with 3, energy can be reduced by using friction stir welding instead of welding.

  Also, a core assembly step for assembling the core 15 by integrating the tube 1 through which the fluid flows and the tank 3 disposed at the end in the longitudinal direction of the tube 1 in communication with the inside of the tube 1, Then, another part assembling process for assembling the modulator assembly 5 and the bracket 13 for fixing the core 15 to the fixed object, and the product obtained up to this other part assembling process are put in a furnace. In a method of manufacturing a heat exchanger comprising an in-furnace brazing step for brazing and fixing, when friction stir welding is used to form components or join components to each other before the in-furnace brazing step Reduces the caulking process and the positioning work of components to perform the desired brazing in the in-furnace brazing process by performing friction stir welding before the in-furnace brazing process It is possible, to improve the manufacturing process, kill is possible to provide a quality surface, the heat exchanger excellent in cost.

(Second Embodiment)
The second embodiment will be described below. FIG. 15 is a cross-sectional view showing a configuration for joining the end portions of the inner fin-type tube using friction stir welding.

  As shown in FIG. 15, the tube 25 of the present embodiment has fins 26 built therein. The thin fins 26 whose cross-sectional shape is formed into a wave shape or a zigzag shape are sandwiched from both sides by a tube 25 divided into two vertically, and the top of the fin 26 formed in a wave shape or a zigzag shape is the tube 25. The ends of the fins 26 that are not in a wave shape or zigzag shape and the ends of the upper and lower tubes 25 that sandwich the fins 26 are aligned with each other by friction stir welding. After the tissue is fluidized, the end portion of the fin 26 and the end portion of the tube 25 are integrated with each other by forming the fixed joint region 24. This joint region 24 may be subjected to spot friction stir welding at a plurality of locations at the joint portion between the end portion of the tube 25 and the end portion of the fin 26, or over the entire joint portion that is extended. Friction stir welding may be performed.

  Thus, according to this embodiment, since friction stir welding is used for the formation of the tube, it is possible to improve the bonding quality of the tube and prevent defective products.

  Further, in the inner fin type tube, when both ends of the tube outer shell and the fin are joined and joined by friction stir welding, the joining quality of the tube can be improved and defective products can be prevented.

(Third embodiment)
The third embodiment will be described below. FIG. 16 is a process diagram showing a process when the pin portion of the stirring terminal is moved in the manufacturing method by friction stir welding.

  As shown in FIG. 16, the friction stir welding shown in the present embodiment is mobilized before the entire stirring terminal is pulled out in the joining step, compared to the friction stir welding described in the first embodiment with reference to FIG. The pin portion 17A is characterized by being pulled out. The configuration that is not particularly described below is the same as that of the friction stir welding in the first embodiment, and a description thereof is omitted.

  This step is composed of three steps: (a) press-fitting, (b) joining / pinning, and (c) drawing. The stirring terminal used for the friction stir welding includes a cylindrical shoulder portion 16A, and a pin portion 17A that protrudes on the concentric shaft of the shoulder portion 16A and rotates together with the shoulder portion 16A. It is configured to be movable in the axial direction so that the amount of protrusion from the shoulder surface 16a can be adjusted, and the agitating terminal can be completely buried in the shoulder portion 16A in the pulling direction.

  The process will be described below. First, the agitation terminal is rotated and moved in the direction of the joint portion of the objects 27 and 28. When the pin portion 17A protruding from the rotating shoulder portion 16A is brought into contact with the joint portion, the rotating pin portion 17A is rotated. Friction heat is generated between the joints 27 and 28, the joints 27 and 28 are softened, and the pin portion 17A is press-fitted into the joint to form a fluidized joint region 29 (see (a) above). Press-fitting process).

  Next, after the pin portion 17A is buried in the joint portion and the shoulder surface 16a formed on the end surface of the shoulder portion 16A on the pin portion 17A side contacts the joint portion, the pressing force to the stirring terminal is maintained for a predetermined time. . The embedding of the pin portion 17A into the joint portion is performed until the tip of the pin portion 17A does not exceed the back surface of the joining portion of the joint portion, that is, the tip of the pin portion 17A does not penetrate the workpiece. It is desirable to displace the agitation terminal and form the joining region as deep as possible. Then, while rotating the shoulder portion 16A against the joint portion, only the pin portion 17A is moved in the axial direction so as to be separated from the joint portion. Then, the pin portion 17A moves away from the joint portion, and the pressing force is released by the pin portion 17A. Therefore, the joint region 30 in a fluid state gradually raises its surface as the tip surface of the pin portion 17A rises. (B) (joining / pinning step).

  Further, when the pin portion 17A further rises and completely enters the inside of the shoulder portion 16A, when the shoulder portion 16A is rotated and detached from the objects 27 and 28, a depression due to the pin portion is formed small in the center portion. The joined region 31 is cooled and solidified, and the butted portions of the objects 27 and 28 are joined by the joined region 31 (above, (c) drawing step).

  As described above, according to the present embodiment, the friction stir welding is performed by rotating the stirring terminal provided with the shoulder portion 16A and the pin portion 17A rotating on the concentric shaft together with the shoulder portion 16A to the object to be joined. It press-fits in the direction, fluidizes the structure of the object to be bonded by the generated frictional heat, and separates the stirring terminal from the object to be bonded, thereby forming a solidified bonding region on the object to be bonded. Yes, when forming the joining region, the pin portion 17A is moved in the axial direction away from the object to be joined with respect to the shoulder portion 16A. First, the pin portion 17A is first removed from the object to be joined, and after the pin portion 17A is immersed in the shoulder portion 16A, the shoulder portion 16A can be pulled out. Since the depression formed in the joining region before being solidified by press-fitting can be reduced, the thickness of the solidified joining region can be increased, and the strength and corrosion resistance of the workpiece can be further improved. it can.

It is process drawing which showed the manufacturing process of the heat exchanger in 1st Embodiment. It is the schematic diagram which showed the structure of the heat exchanger in 1st Embodiment. It is process drawing which showed the process of the friction stir welding in 1st Embodiment. It is the side view which showed the movement of the tank longitudinal direction about the stirring terminal in the friction stir welding shown in FIG. In 1st Embodiment, it is sectional drawing which showed the structure which couple | bonds a modulator pipe | tube and a modulator cap using friction stir welding. In 1st Embodiment, it is sectional drawing which showed the structure which couple | bonds a modulator pipe | tube and an internal thread using friction stir welding. In 1st Embodiment, it is the front view which showed the structure which couple | bonds a modulator pipe | tube and a tank via a plate using friction stir welding. It is an arrow view in the AA cross section of FIG. In 1st Embodiment, it is sectional drawing which showed the structure which couple | bonds a tank and a cap using friction stir welding. It is a perspective view which shows the place which performed the friction stir welding in FIG. In 1st Embodiment, it is sectional drawing which showed the structure which couple | bonds a tank or a modulator pipe | tube, and a bracket using friction stir welding. It is a schematic diagram which shows the place which performed the friction stir welding in FIG. In 1st Embodiment, before the brazing process in a furnace, it is sectional drawing which showed the process of couple | bonding a bracket and a side plate using friction stir welding. It is the perspective view which showed the state after couple | bonding a bracket and a side plate using the friction stir welding shown in FIG. In 2nd Embodiment, it is sectional drawing which showed the structure which joins the edge part of an inner fin type | mold tube using friction stir welding. It is process drawing which showed the process of moving the pin part of a stirring terminal in the manufacturing method by friction stir welding in 3rd Embodiment.

Explanation of symbols

1 Tube 3 Tank 5 Modulator assembly (Attached tank assembly)
6 Cap 8 Bracket 9 Modulator tube (Attached tank)
11 Modulator cap (included tank cap)
12 plates (joint parts)
15 Core 16 Shoulder 17 Pin

Claims (10)

Heat provided with a core (15) having a tube (1) through which a fluid flows and a tank (3) provided at the longitudinal end of the tube (1) in communication with the inside of the tube (1) An exchanger,
A heat exchanger using friction stir welding in forming at least one of the components of the core (15).   The heat exchanger according to claim 1, wherein the tank (3) is made of a plate material, and friction stir welding is used for joining the plate material.   The tank (3) includes a main body and a cap (6) that seals an end of the main body, and the cap (6) and the main body are bonded using friction stir welding. The heat exchanger according to claim 1 or 2. Heat provided with a core (15) having a tube (1) through which a fluid flows and a tank (3) provided at the longitudinal end of the tube (1) in communication with the inside of the tube (1) An exchanger,
An accessory tank (9) provided in communication with the inside of the tank (3) is provided, and the accessory tank (9) is provided with an accessory tank cap (11) for sealing an end thereof, and the accessory tank and the The attached tank cap (11) is a heat exchanger characterized by being joined using friction stir welding. A core (15) having a tube (1) through which a fluid flows, and a tank (3) provided at a longitudinal end of the tube (1) in communication with the inside of the tube (1); (3) A heat exchanger provided with an attached tank assembly (5) communicating with the inside,
The heat exchanger according to claim 1, wherein the attached tank assembly (5) and the tank (3) are joined directly or by using a friction stir joint through a joining part (12) connecting the two. Heat provided with a core (15) having a tube (1) through which a fluid flows and a tank (3) provided at the longitudinal end of the tube (1) in communication with the inside of the tube (1) An exchanger,
The accessory tank (9) provided in communication with the inside of the tank (3) and the female screw (10) attached to the accessory tank (9) are joined by friction stir welding. Exchanger.   The heat exchanger according to any one of claims 1 to 6, wherein a bracket (13) for attaching to a vehicle or a part assembled to the vehicle is joined using friction stir welding.   Heat provided with a core (15) having a tube (1) through which a fluid flows and a tank (3) provided at the longitudinal end of the tube (1) in communication with the inside of the tube (1) A heat exchanger, wherein friction stir welding is used to form the tube. Heat provided with a core (15) having a tube (1) through which a fluid flows and a tank (3) arranged in the longitudinal end of the tube (1) in communication with the inside of the tube (1) A method of manufacturing an exchanger,
It comprises a core assembling step for assembling the core (15) and a step of brazing in a furnace, and friction stir welding for forming component parts or joining components before the in-furnace brazing step The manufacturing method of the heat exchanger characterized by using. A method for producing a heat exchanger comprising at least a tube (1) through which a fluid flows and a tank (3) arranged at the longitudinal end of the tube (1) in communication with the inside of the tube (1). There,
In the heat exchanger, while using the friction stir welding to form the component parts, or to join the component parts,
In the friction stir welding, a stirring terminal having a shoulder portion (16A) and a pin portion (17A) that rotates on a concentric shaft together with the shoulder portion (16A) is brought into rotational contact with an object to be joined and press-fitted in the axial direction. And fluidizing the structure of the object to be bonded by the generated frictional heat, and separating the stirring terminal from the object to be bonded, thereby forming a solidified bonding region on the object to be bonded, When forming a joining area | region, the said pin part (17A) is made to move to the axial direction which leaves | separates from the said to-be-joined object with respect to the said shoulder part (16A), The manufacturing method of the heat exchanger characterized by the above-mentioned.

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