JP2016055317A - Manufacturing method of heat exchanger plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a heat exchanger plate capable of restraining deformation of a cover plate.SOLUTION: A manufacturing method of a heat exchanger plate includes: a cover plate arrangement process of covering a recessed groove 12 formed on a bottom surface 11a of a cover groove 11, by arranging a cover plate 3 in the cover groove 11 opening on the surface 2a side of a base member 2; and a joining process of executing friction stirring by relatively moving a joining rotary tool G along a butting part J1 between sidewalls 11b and 11b of the cover groove 11 and a side surface of the cover plate 3. In the manufacturing method of the heat exchanger plate, in the joining process, when the cover plate 3 is positioned on a right side with respect to an advancing direction of the joining rotary tool G, the rotational direction of the joining rotary tool G is set in a clockwise direction, and when the cover plate 3 is positioned on a left side with respect to the advancing direction of the joining rotary tool G, the rotational direction of the joining rotary tool G is set in a counterclockwise direction, and the friction stirring is performed in a state of shifting a rotation center axis C of the joining rotary tool G to a base member 2 side more than the butting part J1.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a method for manufacturing a heat transfer plate.

  Friction stir welding (FSW = Friction Stir Welding) is known as a method for joining metal members. Friction stir welding is a method in which the metal members are fixed together by rotating the rotary tool along the abutting portion between the metal members and plastically flowing the metal at the abutting portion by frictional heat between the rotating tool and the metal member. Phase joining is performed.

  For example, a heat transfer plate shown in Patent Document 1 includes a lid member, a base member having a concave groove formed on the bottom surface of the lid groove, and a lid plate disposed in the lid groove. The member is friction stir welded.

Japanese Patent No. 3818084

  Since the cover plate is formed thin with respect to the base member, there is a problem that when the friction stirring is performed, the cover plate is easily deformed by frictional heat.

  Then, this invention makes it a subject to provide the manufacturing method of the heat exchanger plate which can suppress a deformation | transformation of a cover plate.

  As means for solving the above-mentioned problems, the present invention provides a lid plate arranging step of placing a lid plate in a lid groove formed around a concave groove opened on the surface side of the base member, and a side wall of the lid groove. And a joining step in which friction stir is performed by relatively moving a joining rotary tool along the abutting portion between the lid plate and the side surface of the lid plate, in the joining step, the lid plate is When located on the right side with respect to the traveling direction of the joining rotary tool, the rotational direction of the joining rotary tool is set clockwise, and the lid plate is located on the left side with respect to the traveling direction of the joining rotary tool. In the case of positioning, the rotation direction of the welding rotary tool is set counterclockwise, and friction stirring is performed in a state where the rotation center axis of the welding rotary tool is shifted to the base member side with respect to the abutting portion. It is characterized by performing.

  According to such a manufacturing method, since the amount of heat input to the cover plate can be reduced by performing frictional stirring while being shifted to the base member side with respect to the butted portion, deformation of the cover plate can be suppressed. Can do. Also, the shearing side of the rotating tool for welding (the relative speed of the outer periphery of the rotating tool for bonding with respect to the joined portion is a value obtained by adding the magnitude of the moving speed to the size of the tangential speed on the outer periphery of the rotating tool for welding From the flow side (the side where the relative speed of the outer circumference of the welding rotary tool with respect to the welded part is a value obtained by subtracting the magnitude of the moving speed from the magnitude of the tangential velocity at the outer circumference of the rotary tool for welding) However, the frictional heat tends to increase. Therefore, the deformation | transformation of a cover board can be suppressed more by setting the advancing direction and rotation direction of the rotation tool for joining so that a shear side may turn into a base member side.

  Moreover, it is preferable to set the thickness of the lid plate to be smaller than the depth of the lid groove. According to this manufacturing method, deformation of the cover plate can be suppressed even if the thickness of the cover plate is reduced.

  Moreover, it is preferable to perform friction stirring in the state which the lower end surface of the shoulder part of the said rotation tool for joining, the said base member, and the said cover plate were made to contact.

  If there is a gap between the lower end surface of the shoulder portion and the base member and the cover plate, the metal member is likely to overflow to the outside and the metal may be insufficient. However, according to such a manufacturing method, the base member, the cover plate, and the shoulder Since there is no gap between the parts and the plastic fluidized metal can be pressed by the lower end surface of the shoulder part, it is possible to suitably perform friction stirring.

  Moreover, in the said joining process, it is preferable to overlap the part of the plasticization area | region formed by making the start end and termination | terminus of the locus | trajectory of the said rotating tool for joining overlap, and friction stirring. According to this manufacturing method, the periphery of the groove can be reliably sealed.

  In the joining step, after forming a plasticized region over the entire periphery of the lid plate, the joining rotary tool is moved away from the lid plate, and at a position away from the lid plate, It is preferable to disengage the stirring pin of the rotating tool for joining.

  If the through hole of the stirring pin is formed closer to the lid plate than the abutting portion, the watertightness and airtightness may be lowered. By providing it at a distant position, it is possible to prevent deterioration of watertightness and airtightness.

  In the joining step, the length of the stirring pin of the joining rotary tool is preferably set in a range of 60% to 100% of the depth of the lid groove. According to this manufacturing method, friction stir welding can be performed up to a deep position of the butt portion.

  Moreover, it is preferable to perform temporary joining with respect to the said butt | matching part in the said joining process using a rotary tool smaller than the said rotation tool for joining.

  According to such a manufacturing method, after the cover plate is temporarily attached to the base member, the butt portion can be fully friction stir welded, so that the positioning accuracy of the cover plate can be increased.

  Moreover, it is preferable to further include a correction step of performing frictional stirring on the back surface of the base member using a rotating tool. Moreover, in the said correction process, it is preferable to set the volume amount of the plasticization area | region formed by the said correction process smaller than the volume amount of the plasticization area | region formed by the said joining process.

  According to this manufacturing method, even if the heat transfer plate is warped due to heat shrinkage due to the joining step, the heat transfer plate can be flattened in the correction step.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the heat exchanger plate which can suppress a deformation | transformation of a cover plate can be provided.

It is the figure which showed the heat exchanger plate which concerns on embodiment of this invention, Comprising: (a) is a disassembled perspective view, (b) is sectional drawing which showed the ditch | groove. It is sectional drawing which showed the state which has arrange | positioned the cover board to the base member which concerns on this embodiment. (A) is the side view which showed the small rotation tool, (b) is the side view which showed the rotation tool for joining. It is the figure which showed the joining process which concerns on this embodiment, Comprising: (a) is a top view, (b) is the II sectional view taken on the line of (a). It is the top view which showed the joining process which concerns on embodiment. It is the perspective view which showed the modification which concerns on this embodiment. It is the figure which showed the heat exchanger plate after the joining process which concerns on this embodiment, Comprising: (a) is a perspective view, (b) is the II-II sectional view taken on the line of (a). It is the top view which showed the correction process which concerns on this embodiment.

  Embodiments according to the heat transfer plate and the method of manufacturing the heat transfer plate of the present invention will be described in detail with reference to the drawings as appropriate. First, the heat transfer plate 1 formed by the method for manufacturing a heat transfer plate according to the present invention will be described.

  As shown in FIGS. 1A and 1B, the heat transfer plate 1 includes a base member 2 and a cover plate 3, and the base member 2 and the cover plate 3 are integrally formed by friction stir welding. The The heat transfer plate 1 is used as a cold plate, a heat plate, or the like by circulating a heat transport fluid through a channel formed inside.

  The base member 2 plays a role of transferring the heat of the heat transport fluid flowing inside to the outside or a role of transferring external heat to the heat transport fluid. The base member 2 includes a lid groove 11, a concave groove 12 formed on the bottom surface 11 a of the lid groove 11, and through holes 4 and 4 that communicate the concave groove 12 and the outside of the base member 2.

  The material of the base member 2 is not particularly limited as long as it is a metal capable of friction stir, but may be appropriately selected from, for example, aluminum, aluminum alloy, copper, copper alloy, titanium, titanium alloy, magnesium, magnesium alloy and the like. The shape of the base member 2 is a substantially rectangular parallelepiped in appearance in the present embodiment, but may be a polygonal column, a cylinder, or the like.

  The lid groove 11 has a substantially meandering shape in plan view, and is recessed in the surface 2 a of the base member 2. The lid groove 11 is a part where the lid plate 3 is disposed. As shown in FIG. 1B, the lid groove 11 has a bottom surface 11a and side walls 11b and 11b standing on the bottom surface 11a. The height of the side wall 11b is larger than the thickness of the cover plate 3 in this embodiment.

  The concave groove 12 has a substantially meandering shape in plan view, and is recessed at the center of the bottom surface 11 a of the lid groove 11. The groove width of the concave groove 12 is smaller than the groove width of the lid groove 11. The concave groove 12 is a portion through which a heat transport fluid (cooling water in the present embodiment) that transports heat to the outside flows. As shown in FIG. 1B, the concave groove 12 has a bottom surface 12a and wall surfaces 12b and 12b standing on the bottom surface 12a. What is necessary is just to set the depth of the ditch | groove 12 suitably according to the use of the heat exchanger plate 1. FIG.

  As shown in FIG. 1A, the through hole 4 is a hole that allows the heat transport fluid to flow through the outside of the base member 2 and the groove 12. The through hole 4 communicates the left side surface 2 c of the base member 2 and the concave groove 12, and communicates the right side surface 2 c of the base member 2 and the concave groove 12. Thereby, the cooling water which flowed in from the one side surface 2c of the base member 2 flows in a zigzag manner in the base member 2 and flows out from the other side surface 2c. The shape, number, and installation position of the through holes 4 can be changed as appropriate according to the type and flow rate of the cooling water.

  The cover plate 3 is a plate-shaped member made of the same material as the base member 2 as shown in FIGS. The lid plate 3 has a rectangular cross section and a planar shape equivalent to the planar shape of the lid groove 11. The cover plate 3 includes a front surface 3a, a back surface 3b, and side surfaces 3c and 3d. The lid plate 3 is disposed in the lid groove 11.

  FIG. 2 is a cross-sectional view showing a state in which a cover plate is arranged on the base member according to the present embodiment. As shown in FIG. 2, the plate thickness of the lid plate 3 is smaller than the depth of the lid groove 11. The distance H1 from the surface 2a of the base member 2 to the surface 3a of the cover plate 3 may be set as appropriate, and is set to 0.3 mm to 1.0 mm, for example. A butt portion J1 is formed at a portion where the side wall 11b of the lid groove 11 and the side surface 3c of the lid plate 3 face each other. Further, a butt portion J1 is formed at a portion where the side wall 11b of the lid groove 11 and the side surface 3d of the lid plate 3 face each other.

  Next, a small rotating tool (hereinafter referred to as “small rotating tool F”) and a rotating tool larger than the small rotating tool F (hereinafter referred to as “joining rotating tool G”) will be described with reference to FIG. To do.

  The small rotary tool F shown in FIG. 3A is mainly used in a temporary joining process and a correction process described later. The small rotary tool F is made of a metal material harder than the base member 2 such as tool steel, and has a columnar shoulder portion F1 and a stirring pin (probe) F2 protruding from a lower end surface F11 of the shoulder portion F1. It is configured with.

  The size and shape of the small rotary tool F may be set according to the material, thickness, etc. of the base member 2, but at least smaller than the bonding rotary tool G (see FIG. 3B). In this way, it is possible to perform friction stir welding with a smaller load than when the welding rotary tool G is used, so it is possible to reduce the load applied to the friction stirrer. Since the moving speed (feeding speed) of F can be made faster than the moving speed of the welding rotary tool G, the working time and cost required for the friction stir welding can be reduced. The lower end surface F11 of the shoulder portion F1 is a part that plays a role of preventing the metal from being plastically fluidized and being scattered around.

  The stirring pin F2 hangs down from the center of the lower end surface F11 of the shoulder portion F1, and is formed into a tapered truncated cone shape in this embodiment. In addition, a stirring blade engraved in a spiral shape is formed on the peripheral surface of the stirring pin F2.

  The joining rotary tool G shown in FIG. 3B is mainly used in the joining process described later. The joining rotary tool G is made of a metal material harder than the base member 2 such as tool steel, and has a columnar shoulder portion G1 and a stirring pin (probe) G2 protruding from the lower end surface G11 of the shoulder portion G1. And is configured.

  The stirring pin G2 hangs down from the center of the lower end surface G11 of the shoulder portion G1, and is formed into a tapered truncated cone shape in this embodiment. In addition, a stirring blade engraved in a spiral shape is formed on the peripheral surface of the stirring pin F2. The length of the stirring pin G2 is formed to be 60% to 100% of the height of the side wall 11b of the lid groove 11 (depth of the lid groove 11). The lower end face G11 of the shoulder part G1 is a part that plays a role of preventing the scattering to the surroundings by pressing the plastic fluidized metal.

  Next, the manufacturing method of a heat exchanger plate is demonstrated. In the heat transfer plate manufacturing method according to the present embodiment, (1) lid groove forming step, (2) concave groove forming step, (3) lid plate arranging step, (4) joining step, and (5) correcting step are executed. To do.

(1) Lid groove forming step and (2) Concave groove forming step The lid groove forming step is a step of forming the lid groove 11 on the surface 2a of the base member 2 as shown in FIGS. It is. The concave groove forming step is a step of forming the concave groove 12 on the bottom surface 11 a of the lid groove 11. In the lid groove forming step and the concave groove forming step, for example, an end mill is used. Further, the through holes 4 and 4 are formed in the side surfaces 2 c and 2 c of the base member 2.

(3) Lid Plate Arrangement Step In the lid plate arrangement step, as shown in FIG. 2, the lid plate 3 is arranged in the lid groove 11 that opens on the surface 2 a side of the base member 2. When the lid plate 3 is disposed, the abutting portion J1 is formed by the side walls 11b and 11b of the lid groove 11 and the side surfaces 3c and 3d of the lid plate 3.

(4) Joining process In the joining process, friction stir welding is performed on the butt portion J1. In the joining step, as shown in FIG. 4A, after the joining rotary tool G is inserted into the start position SM1 set on the surface 2a of the base member 2, the joining rotary tool G is moved along the abutting portion J1. Move relative. A plasticized region W1 is formed on the movement trajectory of the welding rotary tool G.

  As shown in FIG. 4B, in the joining process, the lid plate 3 is positioned on the right side in the traveling direction of the joining rotary tool G, and the rotational direction of the joining rotary tool G is set to the right rotation. Thereby, the base member 2 side becomes the shear side and the cover plate 3 side becomes the flow side with respect to the rotating tool G for bonding. Further, in the joining step, friction agitation is performed in a state where the rotation center axis C is shifted from the abutting portion J1 to the base member 2 side, that is, the side away from the cover plate 3. The distance from the rotation center axis C to the butting part J1 may be set as appropriate within a range in which at least a part of the butting part J1 is frictionally stirred.

  The insertion depth of the joining rotary tool G may be set as appropriate, but is preferably set so that the lower end surface G11 of the shoulder portion G1 is in contact with the base member 2 and the lid plate 3. In the present embodiment, the lower end surface G11 of the shoulder portion G1 and the surface 3a of the lid plate 3 are set to be at the same height, but the lower end surface G11 is set to be pushed into the lid plate 3 by several millimeters. May be. Moreover, it is preferable to set so that the whole depth direction of the butt | matching part J1 may be friction-stirred like this embodiment.

  As shown in FIG. 5, while maintaining the state where the rotation center axis C of the bonding rotary tool G is shifted to the base member 2 side with respect to the abutting portion J <b> 1, the bonding rotary tool G is moved around the lid plate 3. Make a round. After the rotation tool G for welding makes a round around the lid plate 3, the route is set again on the existing plasticized region W <b> 1 and moved, and then the rotary tool G for bonding is moved outside (the side away from the lid plate 3). And the joining rotary tool G is detached at the end position EM1 set on the surface 2a of the base member 2.

  The start position SM1 and the end position EM1 of the joining process are set as described above in the present embodiment, but may be other positions. Moreover, when the cover plate 3 is a relatively large member, after performing the temporary joining process of temporarily joining the cover plate 3 to the base member 2 using the small rotary tool F smaller than the rotating tool G for joining, the joining is performed. You may perform a process. Thereby, since the cover plate 3 does not move in the joining process, the positioning accuracy of the cover plate 3 can be increased.

  As shown in FIG. 6, in the joining step, the lid plate 3 may be positioned on the left side in the traveling direction of the joining rotary tool G, and the rotational direction of the joining rotary tool G may be set to the left rotation. Even in this case, the base member 2 side becomes the shear side and the lid plate 3 side becomes the flow side with respect to the joining rotary tool G.

(5) Straightening process The straightening process is a process of correcting the warpage of the base member 2 and the cover plate 3 generated in the joining step and forming the heat transfer plate 1 flat. In the joining step described above, as shown in FIGS. 7A and 7B, a plasticized region W1 is formed on the surface 2a side of the base member 2 by friction stirring, but the plasticized region W1 is thermally contracted. Therefore, the front surface 2a side of the base member 2 is warped so as to be concave (the back surface 2b side is convex). 7A and 7B, the point j indicates the center point of the base member 2, and the points a, c, f, and h indicate the four corners of the base member 2. Further, points b, d, e, and g indicate intermediate points between the sides of the base member 2. Furthermore, each point of the back surface 2b corresponding to the points a to j shown on the front surface 2a of the base member 2 is defined as points a ′ to j ′ (see FIG. 8).

  As shown in FIG. 7B, after the joining step, the points a ′ to h ′ of the back surface 2 b of the base member 2 are in a state of floating from the installation surface of the gantry K. Therefore, the correction process is performed to correct the warp and flatten the heat transfer plate 1 (base member 2 and lid plate 3).

  In the correction process according to the present embodiment, the back surface 2b of the base member 2 is subjected to friction stirring to correct warpage. In the correction process, the small rotating tool F is used in the present embodiment. In the correction process, first, the base member 2 is turned over and fixed to the gantry K so that the back surface 2b faces upward. Since the surface 2 a of the base member 2 is warped concavely, the installation surface of the gantry K is in contact with the four corners of the base member 2. Then, in the correction process, frictional stirring is performed on the back surface 2b of the base member 2 using the small rotary tool F, and a bending moment that generates tensile stress is applied to the surface 2a side of the base member 2 to correct the warp. .

  As shown in FIG. 8, in the correction process, the movement locus of the small rotary tool F is set to be equivalent to the surface 2 a side of the base member 2. Thereby, the volume amount of the plasticized region W2 formed by the correction process is smaller than the volume amount of the plasticized region W1 formed by the joining step. That is, the amount of heat input to the back surface 2 b of the base member 2 is less than the amount of heat input to the base member 2 and the front surfaces 2 a and 3 a of the lid plate 3. By performing the correction process, heat shrinkage also occurs on the back surface 2b side of the base member 2, so that the warpage of the base member 2 and the cover plate 3 can be corrected. Thereby, the heat exchanger plate 1 becomes flat.

  When the straightening process is completed, a burr cutting process for cutting off burrs generated on the front and back of the heat transfer plate 1 may be performed.

  According to the method for manufacturing a heat transfer plate according to the present embodiment described above, the amount of heat input to the cover plate 3 is reduced by performing frictional stirring while being shifted to the base member 2 side with respect to the butt portion J1. Therefore, deformation of the cover plate 3 can be suppressed. The shear side in friction stirring tends to increase the frictional heat compared to the flow side. In addition, the shear side tends to generate bonding defects more than the flow side. In this embodiment, it is possible to further suppress the deformation of the cover plate by setting the traveling direction and the rotation direction of the bonding rotary tool G so that the base member 2 side is the shear side and the cover plate 3 side is the flow side. it can.

  Further, even if a bonding defect occurs, it is formed at a position away from the cover plate 3, so that the water-tightness and air-tightness of the heat transfer plate 1 can be improved.

  Further, in the joining process, since the friction stir is performed in a state where the lower end face G11 of the shoulder part G1 of the rotating tool G for joining, the base member 2 and the cover plate 3 are in contact with each other, the plastic fluidized metal is used in the shoulder part G1. It can be held by the lower end surface G11. Thereby, the metal shortage of a junction part can be prevented.

  Further, in the joining step, the start and end of the trajectory of the joining rotary tool G are overlapped, and a part of the plasticized region W1 formed by friction stirring is overlapped, so that the periphery of the concave groove 12 can be reliably obtained. Can be sealed.

  Further, in the joining step, after forming the plasticized region W1 over the entire periphery of the lid plate 3, the joining rotary tool G is shifted from the abutting portion J1 to the base member 2 side (side away from the lid plate 3). The stirring pin G2 of the rotating tool for bonding G is detached at a position away from the cover plate 3. Thereby, the fall of the watertightness of the heat exchanger plate 1 and airtightness can be prevented.

  Moreover, the curvature of the heat exchanger plate 1 is corrected by performing a correction process, and the flatness of the heat exchanger plate can be improved. Here, in the joining step, since frictional stirring is performed in a state where the installation surface of the gantry K and the back surface 2b of the base member 2 are in surface contact, heat is extracted from the entire back surface 2b of the base member 2. On the other hand, in the correction process, the surface 2a of the base member 2 warps in a concave shape, so that the installation surface of the gantry K and the base member 2 are in contact with only four points (four corners). Thereby, in a correction process, friction heat becomes difficult to be extracted outside. Therefore, in the present embodiment, the amount of heat input to the base member 2 in the straightening process is set to be smaller than the amount of heat input to the base member 2 and the cover plate 3 in the joining process, thereby achieving a balance of heat shrinkage (warping). And the flatness of the heat transfer plate 1 can be improved.

  In the present embodiment, the small rotation tool F is used so that the heat input amount in the straightening process (volume amount in the plasticized region) is smaller than that in the joining process, but the present invention is not limited to this. For example, the length of friction stirring in the correction process may be set shorter than that in the joining process, or the moving speed of the rotary tool in the correction process may be set faster than in the joining process. Moreover, what is necessary is just to set suitably the route | root of the friction stirring of the correction process so that the curvature of the heat exchanger plate 1 may be corrected.

  The manufacturing method of the heat transfer plate of the present invention has been described above, but the design can be changed as appropriate without departing from the spirit of the present invention. For example, in the present embodiment, the thickness of the lid plate 3 is set smaller than the depth of the lid groove 11, but may be larger than the depth of the lid groove 11 or the same as the depth of the lid groove 11. Also good.

  In the correction process according to the present embodiment, friction agitation is performed on the back surface 2b of the base member 2, but a bending moment that generates tensile stress is applied to the surface 2a of the base member 2 to correct the warp. Also good. For example, you may press with the press apparatus from the back surface 2b of the base member 2, and you may correct a curvature by hitting with impact tools, such as a hammer.

  The shapes of the lid plate 3, the lid groove 11, and the concave groove 12 are not limited to the above-described shapes, and may be set as appropriate according to the application of the heat transfer plate 1.

DESCRIPTION OF SYMBOLS 1 Heat transfer plate 2 Base member 3 Cover plate 4 Through-hole 11 Cover groove 12 Recessed groove F Small rotation tool F1 Shoulder part F2 Stirring pin G Joining rotation tool G1 Shoulder part G2 Stirring pin SM1 Start position EM1 End position W1, W2 Plasticity Area

Claims (9)

A lid plate placement step of placing a lid plate in the lid groove opening on the surface side of the base member and covering the concave groove formed on the bottom surface of the lid groove;
In a method for manufacturing a heat transfer plate, including a joining step of performing frictional stirring by relatively moving a joining rotary tool along a butting portion between a side wall of the lid groove and a side surface of the lid plate,
In the joining step,
When the lid plate is located on the right side with respect to the traveling direction of the joining rotary tool, the rotational direction of the joining rotary tool is set clockwise.
When the lid plate is located on the left side with respect to the traveling direction of the joining rotary tool, the rotational direction of the joining rotary tool is set counterclockwise,
A method of manufacturing a heat transfer plate, wherein friction stir is performed in a state where a rotation center axis of the rotating tool for welding is shifted to the base member side with respect to the abutting portion.   The method for manufacturing a heat transfer plate according to claim 1, wherein the thickness of the lid plate is set smaller than the depth of the lid groove.   The heat transfer plate according to claim 1 or 2, wherein the friction stir is performed in a state in which a lower end surface of a shoulder portion of the rotating tool for joining is in contact with the base member and the lid plate. Method.   4. The bonding process according to claim 1, wherein in the joining step, a start end and an end of a trajectory of the joining rotary tool are overlapped, and a part of a plasticized region formed by friction stirring is overlapped. The manufacturing method of the heat exchanger plate as described in any one of Claims.   In the joining step, after forming the plasticized region over the entire periphery of the lid plate, the joining rotary tool is moved away from the lid plate, and the joining tool is moved away from the lid plate. The method for manufacturing a heat transfer plate according to any one of claims 1 to 4, wherein the stirring pin of the rotary tool is detached.   The length of the stirring pin of the rotating tool for joining is set in the range of 60% to 100% of the depth of the lid groove in the joining step. The manufacturing method of the heat exchanger plate as described in one term.   7. The transmission according to claim 1, wherein in the joining step, temporary joining is performed on the abutting portion using a rotary tool smaller than the rotating tool for joining. 8. Manufacturing method of hot plate.   The method of manufacturing a heat transfer plate according to any one of claims 1 to 7, further comprising a correction step of performing frictional stirring on the back surface of the base member using a rotary tool.   9. The transmission according to claim 8, wherein in the correction step, a volume amount of the plasticized region formed by the correction step is set smaller than a volume amount of the plasticized region formed by the joining step. Manufacturing method of hot plate.

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