JP2018108594A - Manufacturing method for heat transfer plate and friction stir welding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method for a heat transfer plate, by which work time can be shortened and load acting on a friction stirring device can be reduced.SOLUTION: The manufacturing method for a heat transfer plate comprises: a lid groove closing step in which a lid plate 5 is inserted into a lid groove 4 formed around a groove 3 opening in a surface 2a of a base member 2; a temporary joining step in which a spot temporarily joining is carried out by welding along a butting part J between a side wall of the lid groove 4 and a side face of the lid plate 5; and a main joining step in which friction stir is carried out by relatively moving a rotary tool F having a stirring pin F2 along the butting part J. In the main joining step, the friction stir is carried out while only the stirring pin F2 of the rotating rotary tool F are kept in contact with the base member 2 and the lid plate 5.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a method for manufacturing a heat transfer plate and a friction stir welding method.

  Patent Document 1 describes a method for manufacturing a heat transfer plate in which a fluid is circulated through a flow path formed inside a base member to perform heat exchange or the like. The base member is formed with a lid groove that opens on the surface and a concave groove formed on the bottom surface of the lid groove. When manufacturing the heat transfer plate, the lid plate is disposed in the lid groove, and the temporary joining step and the main joining step are performed on the abutting portion formed by the side surface of the lid plate and the side wall of the lid groove. Yes.

  In the temporary joining step, the lower end surface of the shoulder portion is pushed into the metal member to perform friction stir welding. On the other hand, in this joining process, friction stir welding is performed by bringing only the stirring pin into contact with the metal members while exposing the proximal end side of the stirring pin.

JP 2014-94409 A

  In the friction stir welding, it is preferable to shorten the working time and suppress the thermal distortion of the metal member due to the heat input of the friction stir as much as possible.

  From such a viewpoint, it is an object of the present invention to provide a method for manufacturing a heat transfer plate that can shorten the working time and reduce the load acting on the friction stirrer. Moreover, this invention makes it a subject to provide the friction stir welding method which can reduce the load which acts on a friction stirrer while shortening working time.

  In order to solve such a problem, the present invention provides a lid groove closing step of inserting a lid plate into a lid groove formed around a concave groove opening on the surface of the base member, a side wall of the lid groove, Temporary joining process in which spot tacking is performed by welding along the abutting part with the side surface of the cover plate, and main joining in which frictional agitation is performed by relatively moving the main welding rotary tool having a stirring pin along the abutting part. And in the main joining step, friction stirring is performed in a state where only the stirring pin of the rotated main welding rotating tool is in contact with the base member and the lid plate.

  Further, the present invention provides a heat medium tube insertion step of inserting a heat medium tube into a concave groove formed in a bottom surface of a cover groove that opens on the surface of the base member, and a lid for inserting a cover plate into the cover groove. A groove closing step, a temporary joining step in which spot bonding is performed by welding along the abutting portion between the side wall of the lid groove and the side surface of the lid plate, and a rotation for main joining provided with a stirring pin along the abutting portion And a main joining step in which friction stir is performed by relatively moving the tool, and in the main joining step, friction is performed in a state where only the stirring pin of the rotated rotating tool for main joining is in contact with the base member and the lid plate. Stirring is performed.

  According to such a manufacturing method, since the spot joining of the butt portion is performed by welding in the temporary joining step, the process time can be shortened as compared with the case where the temporary joining is performed on the entire length of the butt portion as in the past. it can. Further, in the main joining step, the load acting on the friction stirrer can be reduced by performing the friction stir welding with only the stirring pin in contact with the metal member.

  In the temporary joining step, it is preferable to perform MIG welding, TIG welding, or laser welding.

  Further, the present invention provides a closing step of overlaying a cover plate on the surface of the base member so as to cover a concave groove or a recess opened on the surface of the base member, and polymerization of the surface of the base member and the back surface of the cover plate A temporary joining step for spot tacking by welding along the portion, and a main welding rotary tool having a stirring pin inserted from the surface of the lid plate, and the main welding rotary tool is relatively moved along the overlapping portion. A main joining step of moving, wherein in the main joining step, only the stirring pin of the rotary tool for main joining is brought into contact with both the base member and the lid plate or only the lid plate. It is characterized by carrying out friction stirring of the part.

  Further, the present invention provides a closing step of overlaying a cover plate on the surface of the base member so as to cover a concave groove or a recess opened on the surface of the base member, and polymerization of the surface of the base member and the back surface of the cover plate A temporary joining step for spot tacking by welding along the part, and a main welding rotary tool having a stirring pin inserted from the back surface of the base member, and the main welding rotary tool is relatively moved along the overlapping part. A main joining step of moving, and in the main joining step, the polymerization is performed in a state where only the stirring pin of the rotary tool for main joining is brought into contact with both the base member and the cover plate or only the base member. It is characterized by carrying out friction stirring of the part.

  According to such a manufacturing method, in the temporary joining step, spot overlapping of the overlapped portion is performed by welding, so that the process time can be shortened compared to the case where temporary bonding is performed on the entire length of the overlapped portion as in the past. it can. Further, in the main joining step, the load acting on the friction stirrer can be reduced by performing the friction stir welding with only the stirring pin in contact with the metal member.

  In the temporary joining step, it is preferable to perform MIG welding, TIG welding, or laser welding.

  Moreover, it is preferable to include the burr cutting process which cuts out the burr | flash produced by the friction stirring of the said rotary tool for main joining after completion | finish of the said main joining process. According to this manufacturing method, the base member and the cover plate can be molded neatly.

  The present invention is also a friction stir welding method for joining two metal members using a rotary tool equipped with a stirring pin, wherein the surface of one metal member and the back surface of the other metal member are overlapped. A superposed part forming step for forming a superposed part, a temporary joining step for spot tacking by welding along a superposed part between the surface of one of the metal members and the back surface of the other metal member, and the other metal A state where the stirring pin of the rotating tool for main joining rotated from the surface of the member is inserted, and only the stirring pin is in contact with both the one metal member and the other metal member or only the other metal member. And a main joining step of performing frictional stirring of the superposed portion.

  According to such a method, in the temporary joining step, spot overlapping of the overlapped portion is performed by welding, so that the process time can be shortened compared to the case where temporary bonding is performed on the entire length of the overlapped portion as in the past. . Further, in the main joining step, the load acting on the friction stirrer can be reduced by performing the friction stir welding with only the stirring pin in contact with the metal member.

  In the temporary joining step, it is preferable to perform MIG welding, TIG welding, or laser welding.

  Moreover, it is preferable to include the burr cutting process which cuts out the burr | flash produced by the friction stirring of the said rotary tool for main joining after completion | finish of the said main joining process. According to such a method, the joined metal member can be molded neatly.

  According to the heat transfer plate manufacturing method of the present invention, the working time can be shortened and the load acting on the friction stirrer can be reduced. Further, according to the friction stir welding method according to the present invention, the working time can be shortened and the load acting on the friction stirrer can be reduced.

It is a perspective view which shows the heat exchanger plate which concerns on 1st embodiment of this invention. It is sectional drawing which shows the preparatory process of the manufacturing method of the heat exchanger plate which concerns on 1st embodiment. It is sectional drawing which shows the cover groove | channel obstruction | occlusion process of the manufacturing method of the heat exchanger plate which concerns on 1st embodiment. It is a top view which shows the tab material arrangement | positioning process of the manufacturing method of the heat exchanger plate which concerns on 1st embodiment. It is a perspective view which shows the temporary joining process of the manufacturing method of the heat exchanger plate which concerns on 1st embodiment. It is sectional drawing which shows the temporary joining process of the manufacturing method of the heat exchanger plate which concerns on 1st embodiment. It is sectional drawing which shows the main joining process of the manufacturing method of the heat exchanger plate which concerns on 1st embodiment. It is sectional drawing which shows the preparatory process of the manufacturing method of the heat exchanger plate which concerns on 2nd embodiment of this invention. It is sectional drawing which shows the cover groove | channel obstruction | occlusion process of the manufacturing method of the heat exchanger plate which concerns on 2nd embodiment. It is sectional drawing which shows this joining process which concerns on 2nd embodiment. It is sectional drawing which shows the modification of the main joining process which concerns on 2nd embodiment. It is a perspective view which shows the temporary joining process of the manufacturing method of the heat exchanger plate which concerns on 3rd embodiment of this invention. It is sectional drawing which shows the temporary joining process of the manufacturing method of the heat exchanger plate which concerns on 3rd embodiment. It is sectional drawing which shows this joining process of the manufacturing method of the heat exchanger plate which concerns on 3rd embodiment. It is sectional drawing which shows the temporary joining process of the manufacturing method of the heat exchanger plate which concerns on 4th embodiment of this invention. It is sectional drawing which shows the main joining process of the manufacturing method of the heat exchanger plate which concerns on 4th embodiment. It is sectional drawing which shows the friction stir welding method which concerns on 5th embodiment of this invention. It is sectional drawing which shows the modification of 5th embodiment.

[First embodiment]
A first embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the heat transfer plate 1 according to the present embodiment is mainly composed of a base member 2 and a lid plate 5. The base member 2 has a substantially rectangular parallelepiped shape. A concave groove 3 and a cover groove 4 are formed in the base member 2. The material of the base member 2 is not particularly limited as long as friction stirring is possible, but in this embodiment, it is an aluminum alloy.

  The concave groove 3 penetrates from one side surface toward the other side surface in the center of the base member 2. The concave groove 3 is recessed on the bottom surface of the lid groove 4. The bottom of the concave groove 3 has an arc shape. The opening of the concave groove 3 is opened to the surface 2 a side of the base member 2.

  The lid groove 4 is wider than the groove 3 and is formed continuously with the groove 3 on the surface 2 a side of the groove 3. The lid groove 4 has a rectangular shape in sectional view and is open to the surface 2a side.

  The lid plate 5 is a plate-like member that is inserted into the lid groove 4. In this embodiment, the cover plate 5 is formed of an aluminum alloy that is the same material as the base member 2. The lid plate 5 has the same shape as the hollow portion of the lid groove 4 so as to be inserted into the lid groove 4 without a gap.

  The pair of side walls of the lid groove 4 and the pair of side surfaces of the lid plate 5 are abutted to form the abutting portions J and J. The abutting portions J and J are joined by friction stirring over the entire length in the depth direction. A space surrounded by the groove 3 of the heat transfer plate 1 and the lower surface of the lid plate 5 is a flow path through which the fluid flows.

  Next, the manufacturing method of the heat exchanger plate which concerns on 1st embodiment is demonstrated. In the method for manufacturing a heat transfer plate, a preparation process, a cover groove closing process, a tab material arranging process, a temporary bonding process, and a main bonding process are performed.

  As shown in FIG. 2, the preparation process is a process of preparing the base member 2. First, the base member 2 is fixed to the gantry K via a clamp (not shown). Then, the concave groove 3 and the cover groove 4 are formed by cutting using an end mill or the like. In addition, you may use the base member 2 in which the ditch | groove 3 and the cover groove | channel 4 were formed previously by die-casting or extrusion molding.

  As shown in FIG. 3, the lid groove closing step is a step of inserting the lid plate 5 into the lid groove 4. The side wall of the lid groove 4 and the side surface of the lid plate 5 are abutted to form the abutting portions J and J. The upper surface of the cover plate 5 and the surface 2a are flush with each other.

  As shown in FIG. 4, the tab material arranging step is a step of arranging the tab materials 10 and 10 (see also FIG. 5) on the side surface of the base member 2. The tab material 10 is a member that sets a start position and an end position of friction stirring described later. The tab member 10 is in surface contact with the opposing side surfaces of the base member 2 and is disposed on the extended line of the abutting portions J and J. In this embodiment, the tab material 10 is formed of an aluminum alloy that is the same material as the base member 2. The tab material 10 is joined by welding the corners between the tab material 10 and the base member 2.

  As shown in FIG. 5, the temporary joining step is a step of preliminarily spot tacking the abutting portions J and J by welding. As the welding method, MIG welding (Metal Inert Gas welding), TIG welding (Tungsten Inert Gas welding), laser welding, or the like can be used. In FIG. 5, the code | symbol Y1 is a nozzle of a welding machine. In addition, a symbol Y2 located between the nozzle Y1 and the butt portions J and J is an arc generated between the nozzle Y1 and the butt portions J and J if the welding is MIG welding or TIG welding. In the case of laser welding, the laser beam is emitted from the nozzle Y1.

  When performing temporary joining using such welding, as shown in FIGS. 5 and 6, the nozzle Y1 is moved along the abutting portion J and welded shallowly at a predetermined interval (forms a shallow molten pool), Perform spot tacking. As a result, spot tacking areas W1 that are spot-like welding areas are formed at predetermined intervals. Moreover, in MIG welding and TIG welding, welding is performed while supplying a filler metal, and a weld metal can be formed at the butt portions J and J.

  As shown in FIG. 7, the main joining step is a step of performing friction stir welding on the abutting portions J and J using the rotary tool F (rotary tool for main joining). The rotary tool F includes a connecting portion F1 and a stirring pin F2. The rotary tool F is made of, for example, tool steel. The connecting portion F1 has a cylindrical shape and is a portion connected to a rotating shaft of a friction stirrer (not shown).

  The stirring pin F2 hangs down from the connecting portion F1 and is coaxial with the connecting portion F1. The stirring pin F2 is tapered as it is separated from the connecting portion F1. A spiral groove F3 is formed on the outer peripheral surface of the stirring pin F2. In this embodiment, in order to rotate the rotation tool F to the right, the spiral groove F3 is formed counterclockwise as it goes from top to bottom.

  In addition, when rotating the rotation tool F counterclockwise, it is preferable to form the spiral groove F3 clockwise as it goes from top to bottom. By setting the spiral groove F3 in this way, the metal plastically fluidized during friction stirring is guided to the tip side of the stirring pin F2 by the spiral groove F3.

  Since the spiral groove F3 of the rotary tool F is set as described above, the metal fluidized plastically during the frictional stirring is guided to the tip side of the stirring pin F2 by the spiral groove F3. Thereby, the quantity of the metal which overflows to the exterior of a to-be-joined metal member (base member 2 and cover plate 5) can be decreased. Further, when performing friction stir welding using the rotary tool F, as shown in FIG. 7, only the rotated stirring pin F2 is inserted into the metal member to be joined, and the metal member to be joined and the connecting portion F1 are separated from each other. Move while moving. In other words, the friction stir welding is performed with the base end portion of the stirring pin F2 exposed.

  It is preferable to set the start position and the end position of the main joining process on the surface of the tab material 10. In the main joining step, friction stir welding is performed by tracing the abutting portion J. In the main joining step, it is preferable to insert the rotary tool F so that the tip of the rotary tool F reaches the bottom surface of the lid groove 4. Since the stirring pin F <b> 2 is longer than the depth of the lid groove 4, even if the tip of the stirring pin F <b> 2 reaches the bottom surface of the lid groove 4, the connecting portion F <b> 1 does not contact the base member 2 and the lid plate 5. That is, in the main joining step, the surfaces of the base member 2 and the cover plate 5 are not pressed by the lower surface of the connecting portion F1.

  A plasticized region W is formed on the movement locus of the rotary tool F. The distance between the abutting portion J and the groove 3 is preferably set so that the plastic fluid material does not flow into the groove 3 when the main joining process is performed. When the main joining process is completed, the tab material 10 is cut off from the base member 2.

  In addition, you may perform the burr cutting process which cuts the burr | flash produced by friction stirring after completion | finish of this joining process. By performing the burr cutting process, the surfaces of the base member 2 and the cover plate 5 can be smoothed.

  According to the method for manufacturing a heat transfer plate according to the present embodiment described above, spot tacking is performed by welding in the temporary joining step, so that the time required for the temporary joining step can be shortened. Moreover, since only the stirring pin F2 is inserted into the base member 2 and the cover plate 5 in the main joining step, the amount of heat input can be reduced. Thereby, the thermal distortion of the base member 2 and the cover plate 5 can be reduced.

  Moreover, by performing a temporary joining process, the position shift of the base member 2 and the cover board 5 in a main joining process, and the opening of the butt | matching part J can be prevented.

  In addition, since only the stirring pin F2 of the rotating tool F comes into contact with the base member 2 and the cover plate 5 during the main joining process, the base member 2 is compared with the case where the shoulder portion of the rotating tool F is pushed. And the friction with the cover plate 5 and the rotation tool F can be reduced, and the load concerning a friction stirring apparatus can be made small.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. The heat transfer plate according to the second embodiment is different from the first embodiment in that the heat transfer plate 6 shown in FIG. 9 is provided. The heat medium pipe 6 is a member through which a fluid flows.

  In the method for manufacturing a heat transfer plate according to the second embodiment, a preparation process, a heat medium tube insertion process, a lid groove closing process, a temporary bonding process, and a main bonding process are performed.

  As shown in FIG. 8, the preparation process is a process of preparing the base member 2.

  As shown in FIG. 9, the heat medium tube insertion step is a step of inserting the heat medium tube 6 into the groove 3. The size and the like of the groove 3 and the heat medium pipe 6 may be set as appropriate, but in this embodiment, the outer diameter of the heat medium pipe 6 and the width and depth of the groove 3 are substantially equal. Yes.

  The lid groove closing step is a step of inserting the lid plate 5 into the lid groove 4. The side wall of the lid groove 4 and the side surface of the lid plate 5 are abutted to form an abutting portion J. When the cover plate 5 is inserted into the cover groove 4, the heat medium tube 6 and the cover plate 5 come into contact with each other, and the surface 2 a of the base member 2 and the upper surface of the cover plate 5 are flush with each other.

  The temporary joining step is a step of performing preliminary joining to the abutting portion J. The temporary joining step is performed in the same manner as in the first embodiment.

  As shown in FIG. 10, the main joining step is a step of performing friction stir welding on the abutting portions J and J using the rotary tool F. This joining process is performed in the same manner as the first embodiment. Plasticizing regions W and W are formed on the movement trajectory of the rotary tool F. The plasticized region W is formed over the entire length of the abutting portions J and J in the depth direction.

  The manufacturing method of the heat transfer plate according to the second embodiment can achieve substantially the same effect as the first embodiment. Further, the heat transfer plate 1A including the heat medium pipe 6 can be easily manufactured.

  For example, the shapes of the concave groove 3, the cover groove 4, the cover plate 5, and the heat medium pipe 6 according to the first embodiment and the second embodiment are merely examples, and may be other shapes. . Moreover, when a level | step difference arises between the surface 2a of the base member 2 and the surface of the plasticization area | region W after this joining process, overlay welding may be performed so that the said level | step difference may be filled up. Alternatively, a metal member may be disposed on the surface of the plasticized region W, and the metal member and the base member 2 may be friction stir welded with a rotary tool.

  Moreover, although the case where the cover groove | channel 4 was provided was illustrated in this embodiment, you may make it insert the cover board 5 directly in the concave groove 3, without providing the cover groove | channel 4. FIG.

  Moreover, as shown in FIG. 11, when the space | gap part Q is formed around the pipe | tube 6 for heat media, you may fill this space | gap part Q by this joining process. When the lid plate 5 is inserted into the lid groove 4 in the lid groove closing step, a gap Q is formed by the concave groove 3, the lower surface of the lid plate 5, and the heat medium pipe 6. In the main joining step, the plastic fluidized material formed by the rotary tool F is caused to flow into the gap Q. As a result, the gap Q around the heat medium pipe 6 is filled with metal, so that the heat conductivity between the heat medium pipe 6 and the cover plate 5 can be increased, and water tightness and air tightness can be further improved. Can be increased.

[Third embodiment]
Next, a third embodiment of the present invention will be described. As shown in FIG. 12, the manufacturing method of the heat transfer plate according to the third embodiment is such that the lid groove 4 is not formed in the base member 2 and the lid plate 5 is placed on the surface 2 a of the base member 2. This is different from the first embodiment.

  In the method for manufacturing a heat transfer plate according to the third embodiment, a preparation process, a closing process, a temporary bonding process, and a main bonding process are performed.

  As shown in FIG. 12, the preparation step is a step of preparing the base member 2. A concave groove 3 is formed on the surface 2 a of the base member 2.

  The closing process is a process of placing the cover plate 5 on the surface 2 a of the base member 2 and covering the upper part of the groove 3. In the concave groove closing step, the front surface 2a of the base member 2 and the back surface 5b of the cover plate 5 are overlapped to form the overlapping portion J1.

  As shown in FIG. 12, the temporary joining step is a step of preliminarily spot tacking the butt portion J1 by welding. As the welding method, MIG welding, TIG welding, laser welding, or the like can be used. When performing temporary joining using such welding, as shown in FIGS. 12 and 13, the nozzle Y1 is moved along the abutting portion J1 and welded shallowly at a predetermined interval (forms a shallow molten pool), Perform spot tacking. As a result, spot tacking areas W1 that are spot-like welding areas are formed at predetermined intervals. Moreover, in MIG welding and TIG welding, welding can be performed while supplying a filler metal, and a weld metal can be formed in the butt | joint part J1.

  As shown in FIG. 14, the main joining step is a step of performing friction stir welding on the overlapping portion J <b> 1 using the rotary tool F (rotary tool for main joining). In the present embodiment, the rotary tool F is inserted vertically from the surface 5 a of the cover plate 5, and the tip of the stirring pin F <b> 2 enters the base member 2. Moreover, in this joining process, friction stirring is performed in the state which does not contact the connection part F1 with the cover plate 5. FIG. Thereby, the heat exchanger plate 1B is formed.

  In addition, you may perform the burr cutting process which cuts the burr | flash produced by friction stirring after completion | finish of this joining process. By performing the burr cutting process, the surface of the cover plate 5 can be smoothed.

  Even if it is the manufacturing method of the heat exchanger plate which concerns on 3rd embodiment, there can exist an effect substantially equivalent to 1st embodiment. Further, even if the cover plate 5 having a large plate thickness is placed on the surface 2a of the base member 2 without providing the cover groove 4, the heat transfer plate 1B can be easily manufactured.

  In this embodiment, the tip of the stirring pin F2 is set so as to be pushed to the position where it reaches the base member 2, but is set so as not to reach the base member 2. That is, only the stirring pin F2 and the cover plate 5 are set. It may be set so that the overlapping portion J1 is frictionally stirred by being pushed to the position where it contacts. In such a case, the base member 2 and the cover plate 5 are plastically fluidized by the frictional heat generated by the contact between the stirring pin F2 and the cover plate 5, whereby the overlapping portion J1 is joined.

  Moreover, in this embodiment, although the rotation tool F was inserted from the surface 5a of the cover board 5, you may make it friction stir the superposition | polymerization part J1 by inserting the rotation tool F from the back surface 2b of the base member 2. FIG. Even in such a case, the agitation pin F2 may be pushed to a position where it contacts both the base member 2 and the cover plate 5, or may be pushed to a position where only the base member 2 is brought into contact for friction stirring. It may be set.

[Fourth embodiment]
Next, a fourth embodiment of the present invention will be described. As shown in FIG. 15, the method for manufacturing a heat transfer plate according to the fourth embodiment is different from the third embodiment in that a recess 20 having a large recess is formed.

  The manufacturing method of the heat exchanger plate according to the fourth embodiment performs a preparation process, a closing process, a temporary bonding process, and a main bonding process.

  As shown in FIG. 15, the preparation step is a step of preparing the base member 2. A recess 20 is formed in the surface 2 a of the base member 2. The recess 20 is a recess that is sufficiently wider than the recess 3.

  The closing process is a process of placing the cover plate 5 on the surface 2 a of the base member 2 and covering the recess 20. In the closing step, the front surface 2a of the base member 2 and the back surface 5b of the cover plate 5 are overlapped to form the overlapping portion J1.

  As shown in FIG. 15, the temporary joining step is a step of preliminarily spot tacking the butt portion J1 by welding. As the welding method, MIG welding, TIG welding, laser welding, or the like can be used. When such temporary bonding is performed, spot welding is performed by shallowly welding (forming a shallow molten pool) at a predetermined interval from the side surfaces of the base member 2 and the cover plate 5 along the overlapping portion J1. As a result, spot tacking areas W1 that are spot-like welding areas are formed at predetermined intervals. Moreover, in MIG welding and TIG welding, welding can be performed while supplying a filler metal, and a weld metal can be formed in the butt | joint part J1.

  As shown in FIG. 16, the present bonding process is the same as that of the third embodiment, and thus detailed description thereof is omitted. Thereby, the heat transfer plate 1C is formed.

  In the method for manufacturing a heat transfer plate according to the fourth embodiment, substantially the same effect as that of the third embodiment can be achieved. Further, according to the fourth embodiment, the heat transfer plate 1C can be easily formed even when the cover plate 5 having the recess 20 larger than the recess 3 and having a large plate thickness is placed. .

  In the present embodiment, the tip of the stirring pin F2 is set to be pushed down to the position reaching the base member 2, but is set not to reach the base member 2, that is, only the stirring pin F2 and the cover plate 5 are set. It may be set so that the overlapping portion J1 is frictionally stirred by being pushed to the position where it contacts. In such a case, the base member 2 and the cover plate 5 are plastically fluidized by the frictional heat generated by the contact between the stirring pin F2 and the cover plate 5, whereby the overlapping portion J1 is joined.

  Moreover, in this embodiment, although the rotation tool F was inserted from the surface 5a of the cover board 5, you may make it friction stir the superposition | polymerization part J1 by inserting the rotation tool F from the back surface 2b of the base member 2. FIG. Even in this case, the stirring pin F2 may be pushed to a position where it contacts both the base member 2 and the cover plate 5, or may be pushed to a position where it only contacts the base member 2, and set so as to be frictionally stirred. May be.

[Fifth embodiment]
Next, a friction stir welding method according to the fifth embodiment of the present invention will be described. The fifth embodiment is different from the other embodiments in that metal members that are not provided with a channel such as the groove 3 and the recess 20 are joined together.

  In the friction stir welding method according to the fifth embodiment, a preparation step, a superposed portion forming step, a temporary joining step, and a main joining step are performed.

  As shown in FIG. 17, the preparation process is a process of preparing the metal members 31 and 32. The metal members 31 and 32 are plate-shaped metal members. The types of the metal members 31 and 32 may be appropriately selected from metals that can be frictionally stirred.

  The overlapping part forming step is a step of overlapping the metal members 31 and 32. In the overlap portion forming step, the overlap portion J1 is formed by superimposing the back surface 32b of the metal member 32 on the front surface 31a of the metal member 31.

  A temporary joining process is a process of performing spot temporary attachment with respect to the superposition | polymerization part J1 by welding. As the welding method, MIG welding, TIG welding, laser welding, or the like can be used. When such temporary bonding is performed, spot welding is performed by shallowly welding (forming a shallow molten pool) at a predetermined interval along the overlapping portion J1 from each side surface of the metal members 31 and 32. As a result, spot tacking regions W1, which are spot-like welding regions, are formed along the overlapping portion J1 at predetermined intervals. In MIG welding and TIG welding, welding can be performed while supplying a filler metal, and a weld metal can be formed in the overlapping portion J1.

  The main joining step is a step of performing friction stir welding on the overlapping portion J1 using the rotary tool F (rotary tool for main joining). In the present embodiment, the rotary tool F is inserted vertically from the surface 32 a of the metal member 32, and the tip of the stirring pin F <b> 2 is set to enter the metal member 31. Moreover, in this joining process, friction stirring is performed in the state which does not contact the connection part F1 with the metal member 32. FIG. Thereby, the composite plate 1D is formed.

  According to the friction stir welding method according to the fifth embodiment, since the spot tacking is performed in the temporary joining process, the time required for the temporary joining process can be shortened. Moreover, since only the stirring pin F2 is inserted into the metal members 31 and 32 in the main joining step, the amount of heat input can be reduced. Thereby, the thermal strain of the metal members 31 and 32 can be reduced.

  Moreover, by performing a temporary joining process, the position shift of the metal members 31 and 32 in the main joining process and the opening of the overlapping portion J1 can be prevented.

  In addition, since only the stirring pin F2 of the rotary tool F comes into contact with the metal members 31 and 32 during the main joining process, the metal members 31 and 32 are compared with the case where the shoulder portion of the rotary tool F is pushed. And the rotation tool F can be reduced, and the load applied to the friction stirrer can be reduced.

  In the fifth embodiment, the main joining step may be performed using a tab material as in the first embodiment. Also, as shown in FIG. 18, when performing the main joining process, the tip of the stirring pin F2 is set so as not to reach the metal member 31, that is, the stirring pin F2 is set to contact only the metal member 32. Then, friction stirring may be performed. In such a case, the metal members 31 and 32 can be joined together by bringing the plasticized region W and the overlapping portion J1 into contact with each other. That is, the superposed portion J1 can be joined by plastic fluidizing the metal members 31 and 32 by frictional heat generated by the contact between the stirring pin F2 and the metal member 32.

  Further, the rotary tool F (main welding rotary tool) and the nozzle Y1 may be attached to a robot arm provided with a rotation driving means such as a spindle unit. Thereby, workability | operativity can be improved.

DESCRIPTION OF SYMBOLS 1 Heat transfer plate 2 Base member 3 Concave groove 4 Cover groove 5 Cover plate 6 Heat medium pipe 10 Tab material 20 Concave part 31 Metal member 32 Metal member F Rotating tool (Rotating tool for main joining)
F1 stirring pin J abutting part J1 superposition part W plasticizing area W1 spot tacking area Y1 nozzle

Claims (10)

A lid groove closing step of inserting a lid plate into the lid groove formed around the concave groove opened on the surface of the base member;
A temporary joining step of performing spot tacking by welding along the abutting portion between the side wall of the lid groove and the side surface of the lid plate;
And a main joining step in which friction stir is performed by relatively moving a rotary tool for main joining provided with a stirring pin along the abutting portion, and
In the main joining step, the friction stir is performed in a state where only the stirring pin of the rotated main welding rotating tool is in contact with the base member and the lid plate, and the method of manufacturing a heat transfer plate. A heat medium tube insertion step of inserting the heat medium tube into the groove formed in the bottom surface of the lid groove opened on the surface of the base member;
A lid groove closing step of inserting a lid plate into the lid groove;
A temporary joining step of performing spot tacking by welding along the abutting portion between the side wall of the lid groove and the side surface of the lid plate;
And a main joining step in which friction stir is performed by relatively moving a rotary tool for main joining provided with a stirring pin along the abutting portion, and
In the main joining step, the friction stir is performed in a state where only the stirring pin of the rotated main welding rotating tool is in contact with the base member and the lid plate, and the method of manufacturing a heat transfer plate.   3. The method for manufacturing a heat transfer plate according to claim 1, wherein MIG welding, TIG welding, or laser welding is performed in the temporary joining step. A closing step of overlaying a cover plate on the surface of the base member so as to cover the recessed groove or recess opening on the surface of the base member;
A temporary joining step of spot tacking by welding along the overlapping portion of the surface of the base member and the back surface of the lid plate;
A main joining step of inserting a main welding rotary tool provided with a stirring pin from the surface of the lid plate and relatively moving the main welding rotary tool along the overlapping portion;
In the main joining step, friction stir of the overlapping portion is performed in a state where only the stirring pin of the rotating tool for main joining is in contact with both the base member and the lid plate or only the lid plate. A method for manufacturing a heat transfer plate. A closing step of overlaying a cover plate on the surface of the base member so as to cover the recessed groove or recess opening on the surface of the base member;
A temporary joining step of spot tacking by welding along the overlapping portion of the surface of the base member and the back surface of the lid plate;
A main joining step of inserting a main welding rotary tool provided with a stirring pin from the back surface of the base member and relatively moving the main welding rotary tool along the overlapping portion;
In the main joining step, friction stir of the overlapping portion is performed in a state where only the stirring pin of the rotary tool for main joining is in contact with both the base member and the cover plate or only the base member. A method for manufacturing a heat transfer plate.   6. The method for manufacturing a heat transfer plate according to claim 4, wherein MIG welding, TIG welding, or laser welding is performed in the temporary joining step.   The transmission according to any one of claims 1 to 6, further comprising a burr cutting step of cutting a burr generated by frictional stirring of the rotary tool for main bonding after the main bonding step. Manufacturing method of hot plate. A friction stir welding method for joining two metal members using a rotary tool equipped with a stirring pin,
A superposition part forming step of superposing the front surface of one metal member and the back surface of the other metal member to form a superposition part;
A temporary joining step of performing spot tacking by welding along the overlapping portion of the surface of one metal member and the back surface of the other metal member;
Insert the stirring pin of the rotating tool for main welding rotated from the surface of the other metal member, and put only the stirring pin into both the one metal member and the other metal member, or only the other metal member. A friction stir welding method comprising: a main joining step of performing friction stir of the overlapping portion in a contacted state.   The friction stir welding method according to claim 8, wherein in the temporary joining step, MIG welding, TIG welding, or laser welding is performed.   10. The friction stir welding method according to claim 8, further comprising a burr cutting step of cutting a burr generated by friction stirring of the main welding rotary tool after the main welding step.

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