JP2020011273A - Manufacturing method of heat transfer plate and friction agitation joining method - Google Patents

Abstract

To provide a manufacturing method of a heat transfer plate capable of minimizing warpage due to step recessed groove and heat shrinkage of the surface of a metal member and capable of minimizing joint surface roughness.SOLUTION: A manufacturing method of a heat transfer plate includes a cover plate insertion process of inserting a cover plate 5, a main joining process of relatively moving a main joining rotation tool F provided with a base end side pin F2 and a tip side pin F3 along an abutting part J between a lateral wall of a cover groove 4 and a lateral surface of the cover plate 5 and performing friction agitation and a correction process of correcting such warpage as to be convex to the back surface 2b side of a base member 2 formed by the main joining process by actuating such a bending moment that a tensile stress is generated on the surface 2a side of the base member 2. Therein, on the main joining process, the rotated tip side pin F3 of the main joining rotation tool F is inserted to the abutting part J and friction agitation is performed in such a state as to bring an outer circumferential surface of the base end side pin F2 into contact with the base member 2 and the cover plate 5.SELECTED DRAWING: Figure 9B

Description

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

  As a rotary tool used for friction stir welding, a rotary tool having a shoulder portion and a stirring pin hanging from the shoulder portion is known. The rotary tool performs friction stir welding with the lower end surface of the shoulder portion pressed into the metal member. By pushing the shoulder portion into the metal member, it is possible to suppress the plastic flow material and suppress the occurrence of burrs. However, when the height position of the joint changes, a defect is apt to occur, and there is a problem that a stepped groove becomes large and burrs are often generated.

  On the other hand, it is a friction stir welding method of joining two metal members using a rotating tool having a stirring pin, in which a rotated stirring pin is inserted into a butt portion between metal members, and only the stirring pin contacts the metal member. There has been known a friction stir welding method including a main joining step of performing friction stir welding in a state where the friction stir welding is performed (Patent Document 1). According to the related art, a spiral groove is engraved on the outer peripheral surface of the stirring pin, and friction stir welding is performed in a state where the base end is exposed while only the stirring pin is in contact with the member to be welded. The occurrence of defects can be suppressed even when the height position of the joint changes, and the load on the friction stirrer can be reduced. However, since the plastic flow material is not pressed by the shoulder portion, there is a problem that the stepped groove on the surface of the metal member increases and the joining surface roughness increases. In addition, there is a problem that a bulging portion (a portion where the surface of the metal member bulges compared to before the joining) is formed beside the stepped groove.

  On the other hand, Patent Literature 2 discloses a rotary tool including a shoulder portion and a stirring pin hanging from the shoulder portion. A tapered surface is formed on each of the shoulder portion and the outer peripheral surface of the stirring pin. A spiral groove in a plan view is formed on the tapered surface of the shoulder portion. The cross-sectional shape of the groove is semicircular. By providing the tapered surface, stable joining can be performed even if the thickness of the metal member or the height position of the joining changes. In addition, when the plastic flow material enters the groove, the flow of the plastic flow material can be controlled to form a suitable plasticized region.

JP 2013-39613 A Japanese Patent No. 4210148

  However, according to the related art of Patent Literature 2, there is a problem that the groove does not function because the plastic flowing material enters the inside of the groove on the tapered surface. Further, when the plastic fluid enters the groove, friction stir is performed in a state where the plastic fluid adheres to the groove, so that there is a problem that the metal member to be welded and the adhered material rub against each other to deteriorate the joining quality. Further, there is a problem that the surface of the metal member to be joined becomes rough, burrs increase, and the stepped groove on the surface of the metal member also increases. Further, if the friction stir welding is performed only from the surface side of the metal member to be welded, there is a problem that thermal contraction occurs due to frictional heat between the metal member to be welded and the rotating tool, and the surface side warps so as to be concave. .

  From such a viewpoint, the present invention provides a method of manufacturing a heat transfer plate and a method of producing a heat transfer plate capable of reducing warpage due to a stepped groove and thermal shrinkage on the surface of a metal member, and reducing the joining surface roughness. It is an object to provide a joining method.

  In order to solve such a problem, the present invention provides a lid plate inserting step of inserting a lid plate into a lid groove formed around a concave groove opened on the surface of the base member, A main joining step of relatively moving a main joining rotary tool having a base side pin and a front end side pin along an abutting portion with a side surface of the lid plate to perform frictional stirring, and the base formed by the main joining step A correction step of correcting the warpage that becomes convex on the back side of the member by applying a bending moment such that a tensile stress is generated on the front side of the base member, wherein the taper angle of the base-side pin is The taper angle of the distal-side pin is larger than that of the base-side pin, and a step-shaped step is formed on the outer peripheral surface of the proximal-side pin. Butt pin It was inserted into the section, and performing friction stir the outer peripheral surface of the proximal-side pins being in contact with the base member and the cover plate.

  Further, the present invention provides a heat medium tube inserting step of inserting a heat medium tube into a concave groove formed on a bottom surface of a cover groove opening on a surface of a base member, and a cover for inserting a cover plate into the cover groove. A plate insertion step, and a main joining step of performing relative stirring of a main joining rotary tool including a base end side pin and a front end side pin along an abutting portion between a side wall of the lid groove and a side surface of the lid plate to perform friction stirring. And a correction step of correcting the warpage that is convex on the back side of the base member formed by the main bonding step by applying a bending moment such that a tensile stress is generated on the front side of the base member; Wherein the taper angle of the proximal-side pin is larger than the taper angle of the distal-side pin, and a step-shaped step portion is formed on the outer peripheral surface of the proximal-side pin; In the joining step, the main joining rotation that has been rotated Insert the distal end side pin Lumpur to the abutting portion, and performing friction stir the outer peripheral surface of the proximal-side pins being in contact with the base member and the cover plate.

  Further, the present invention provides a closing step of superposing a lid plate on the surface of the base member so as to cover a concave groove or a concave portion opened on the surface of the base member, and a base-side pin and a distal-side pin from the surface of the lid plate. A main joining step of inserting the main joining rotary tool having a main joint and a relative movement of the main joining rotary tool along an overlapping portion between the front surface of the base member and the back surface of the lid plate, A correction step of correcting the formed warpage convex on the back side of the base member by applying a bending moment such that a tensile stress is generated on the front side of the lid plate; and The taper angle of the pin is larger than the taper angle of the distal pin, and a stepped step is formed on the outer peripheral surface of the proximal pin. Rotary tool for permanent joining Insert the distal end pin into the surface of the lid plate, and contact the outer peripheral surface of the proximal end pin only to the lid plate, and move the distal end pin to both the base member and the lid plate, or The friction stir of the overlapping portion is performed in a state of being brought into contact with only the lid plate.

  Further, the present invention provides a closing step of superposing a lid plate on the surface of the base member so as to cover a concave groove or a concave portion opened on the surface of the base member, and a base-side pin and a distal-side pin from the back surface of the base member. A main joining step of inserting the main joining rotary tool having a main joint and a relative movement of the main joining rotary tool along an overlapping portion between the front surface of the base member and the back surface of the lid plate, A correcting step of correcting the formed warpage convex on the front side of the cover plate by applying a bending moment such that a tensile stress is generated on the back side of the base member, The taper angle of the pin is larger than the taper angle of the distal pin, and a stepped step is formed on the outer peripheral surface of the proximal pin. Times for final joining Insert the distal pin of the tool into the back surface of the base member, while contacting the outer peripheral surface of the proximal pin only to the base member, the distal pin both the base member and the lid plate, or It is characterized in that friction stir of the overlapping portion is performed in a state of being brought into contact with only the base member.

  Further, the present invention is a friction stir welding method of joining two metal members using a full joining rotary tool having a proximal pin and a distal pin, wherein the surface of one metal member and the other A superposed portion forming step of forming a superposed portion by superimposing the back surface of the metal member, and inserting a tip side pin of the main joining rotary tool rotated from the surface of the other metal member, along the superposed portion A main joining step of relatively moving the main joining rotary tool to perform friction stir, and a warp that is convex on the back side of one of the metal members formed in the main joining step, and is a surface of the other metal member. Correction step by applying a bending moment such that a tensile stress is generated on the side, the taper angle of the proximal pin is larger than the taper angle of the distal pin, Proximal end A step-shaped step portion is formed on the outer peripheral surface of the pin, and in the final joining step, a distal pin of the rotated rotating tool for final joining is inserted into the surface of the other metal member, and the base end is inserted. While the outer peripheral surface of the side pin is in contact only with the other metal member, the tip pin is in contact with both the one metal member and the other metal member, or only the other metal member. It is characterized in that the agitating section is friction-stirred.

  According to this method, since the base member and the cover plate or the metal member can be pressed by the outer peripheral surface of the base-side pin having a large taper angle, the stepped groove on the joining surface can be reduced, and the stepped groove can be reduced. The bulge formed on the side can be eliminated or reduced. Since the step-shaped step portion is shallow and has a wide exit, the plastic fluid hardly adheres to the outer peripheral surface of the base-side pin even if the metal member is pressed by the base-side pin. Therefore, the joining surface roughness can be reduced, and the joining quality can be suitably stabilized. Further, by providing the distal end side pin, it can be easily inserted to a deep position. Further, by performing the straightening step, warpage due to heat shrinkage can be reduced.

  It is preferable that the method further includes a temporary joining step of temporarily joining the butted portions before the main joining step. Further, it is preferable that the method further includes a temporary joining step of temporarily joining the overlapped portion before the main joining step. According to this method, it is possible to prevent the opening of the butted portion or the overlapped portion in the main joining step.

  It is preferable that the method further includes a burr removing step of removing burr generated by frictional stirring of the rotating tool for final bonding after the completion of the main bonding step. According to such a method, the joining surface can be finely finished.

  In the straightening step, it is preferable that the warping is corrected by hitting and correcting the base member and the cover plate with a press straightener, a roll straightener, or an impact tool. Further, it is preferable to correct the warpage by pressing and correcting the one metal member and the other metal member with a press straightener, a roll straightener, or an impact tool.

  According to such a method, the correction step can be easily performed.

  ADVANTAGE OF THE INVENTION According to the manufacturing method of a heat exchanger plate and the friction stir welding method according to the present invention, it is possible to reduce the stepped grooves on the surface of the metal member and the warpage due to thermal shrinkage, and also to reduce the joining surface roughness. .

It is a side view which shows the rotation tool for this joining used for the joining method which concerns on embodiment of this invention. It is an expanded sectional view of the rotation tool for this joining. It is sectional drawing which shows the 1st modification of the rotating tool for this joining. It is sectional drawing which shows the 2nd modification of this rotation tool for joining. It is sectional drawing which shows the 3rd modification of the rotation tool for this joining. It is a perspective view showing the heat transfer plate concerning a first embodiment of the present invention. It is sectional drawing which shows the preparation process of the manufacturing method of the heat transfer plate which concerns on 1st embodiment. It is a sectional view showing a lid board insertion process of a manufacturing method of a heat exchanger plate concerning a first embodiment. It is a top view showing a tab material arrangement process of a manufacturing method of a heat exchanger plate concerning a first embodiment. It is sectional drawing which shows the manufacturing method of the heat transfer plate which concerns on 1st embodiment, and shows a temporary joining process. It is sectional drawing which shows the manufacturing method of the heat transfer plate which concerns on 1st embodiment, and shows a main joining process. FIG. 4 is a perspective view showing a state after performing a main bonding step in the method for manufacturing a heat transfer plate according to the first embodiment. It is sectional drawing of the line which connects point d and point e of FIG. 10A. It is a perspective view showing the straightening process of the manufacturing method of the heat transfer plate concerning a first embodiment. It is a sectional view showing before straightening in a straightening process of a manufacturing method of a heat exchanger plate concerning a first embodiment. FIG. 4 is a cross-sectional view showing a state during the straightening step in the straightening step of the method for manufacturing a heat transfer plate according to the first embodiment. It is a top view for explaining a correction process. It is a perspective view which shows the roll straightening process which is a modification of a straightening process. It is sectional drawing which shows before a straightening process in the roll straightening process which is a modification of a straightening process. FIG. 10 is a cross-sectional view showing a state in a straightening process in a roll straightening process which is a modification of the straightening process. It is a conceptual diagram showing the conventional rotation tool. It is a conceptual diagram showing the conventional rotation tool. It is sectional drawing which shows the manufacturing method of the heat transfer plate which concerns on 2nd embodiment of this invention, and shows a preparation process. It is sectional drawing which shows the manufacturing method of the heat transfer plate which concerns on 2nd embodiment of this invention, and shows a cover plate insertion process. It is sectional drawing which shows the main joining process which concerns on 2nd embodiment. It is sectional drawing which shows the manufacturing method of the heat transfer plate which concerns on 3rd Embodiment of this invention, and shows a temporary joining process. It is sectional drawing which shows the manufacturing method of the heat transfer plate which concerns on 3rd embodiment, and shows a main joining process. It is sectional drawing which shows the manufacturing method of the heat transfer plate which concerns on 4th Embodiment of this invention, and shows a temporary joining process. It is sectional drawing which shows the manufacturing method of the heat transfer plate which concerns on 4th Embodiment of this invention, and shows a main joining process. It is a sectional view showing a friction stir welding method concerning a fifth embodiment of the present invention. It is sectional drawing which shows the modification of 5th Embodiment.

  An embodiment of the present invention will be described with reference to the drawings as appropriate. First, a rotary tool (rotary tool) for full bonding used in the bonding method according to the present embodiment will be described. The welding rotary tool is a tool used for friction stir welding. As shown in FIG. 1, the main joining rotary tool F is made of, for example, tool steel, and mainly includes a base shaft portion F1, a base end pin F2, and a front end pin F3. The base shaft portion F1 has a columnar shape and is a portion connected to the main shaft of the friction stirrer.

  The proximal-side pin F2 is continuous with the base shaft portion F1 and tapers toward the distal end. The proximal pin F2 has a truncated cone shape. The taper angle A of the proximal-side pin F2 may be set as appropriate, and is, for example, 135 to 160 °. When the taper angle A is less than 135 ° or more than 160 °, the joining surface roughness after friction stirring becomes large. The taper angle A is larger than the taper angle B of the tip side pin F3 described later. As shown in FIG. 2, a stepped step portion F <b> 21 is formed on the outer peripheral surface of the proximal end pin F <b> 2 over the entire height direction. The step portion F21 is formed in a clockwise or counterclockwise spiral shape. That is, the step portion F21 has a spiral shape in plan view, and has a stepped shape in side view. In the present embodiment, the step portion F21 is set counterclockwise from the base end to the tip end in order to rotate the rotary tool F for clockwise rotation.

  In addition, when rotating the joining rotary tool F counterclockwise, it is preferable to set the stepped portion F21 clockwise from the base end to the tip end. Accordingly, the plastic fluid material is guided to the tip side by the stepped portion F21, so that the metal overflowing to the outside of the metal member to be joined can be reduced. The step portion F21 includes a step bottom surface F21a and a step side surface F21b. The distance X1 (horizontal distance) between the vertices F21c and F21c of the adjacent step portion F21 is appropriately set according to a step angle C described later and a height Y1 of the step side surface F21b.

  The height Y1 of the step side surface F21b may be set as appropriate, and is set, for example, to 0.1 to 0.4 mm. If the height Y1 is less than 0.1 mm, the joining surface roughness increases. On the other hand, if the height Y1 exceeds 0.4 mm, the joining surface roughness tends to increase, and the number of effective steps (the number of steps F21 in contact with the metal member to be joined) also decreases.

  The step angle C formed between the step bottom surface F21a and the step side surface F21b may be appropriately set, and is set, for example, to 85 to 120 °. In the present embodiment, the step bottom surface F21a is parallel to the horizontal plane. The step bottom surface F21a may be inclined in a range of −5 ° to 15 ° with respect to the horizontal plane from the rotation axis of the tool toward the outer periphery (a minus is below the horizontal plane, and a plus is relative to the horizontal plane). Above). The distance X1, the height Y1 of the step side surface F21b, the step angle C, and the angle of the step bottom surface F21a with respect to the horizontal plane are such that the plastic flow material stays inside the step portion F21 and does not adhere to the outside when performing frictional stirring. At this time, it is set appropriately so that the plastic flow material can be pressed by the step bottom surface F21a to reduce the joining surface roughness.

  As shown in FIG. 1, the distal pin F3 is formed continuously with the proximal pin F2. The tip side pin F3 has a truncated cone shape. The tip of the tip side pin F3 has a flat surface. The taper angle B of the distal pin F3 is smaller than the taper angle A of the proximal pin F2. As shown in FIG. 2, a helical groove F31 is formed on the outer peripheral surface of the distal end side pin F3. The spiral groove F31 may be clockwise or counterclockwise. However, in the present embodiment, the spiral groove F31 is formed in a counterclockwise direction from the base end to the distal end in order to rotate the main joining rotary tool F clockwise.

  In addition, when rotating the joining rotary tool F to the left, it is preferable to set the spiral groove F31 clockwise from the base end to the tip end. Thereby, the plastic fluid material is guided to the front end side by the spiral groove F31, so that the metal overflowing to the outside of the metal member to be joined can be reduced. The spiral groove F31 includes a spiral bottom surface F31a and a spiral side surface F31b. The distance (horizontal distance) between the vertices F31c and F31c of the adjacent spiral groove F31 is defined as a length X2. The height of the spiral side surface F31b is defined as height Y2. The spiral angle D formed by the spiral bottom surface F31a and the spiral side surface F31b is, for example, 45 to 90 °. The spiral groove F31 has a role of increasing frictional heat by coming into contact with the metal member to be joined, and guiding the plastic fluid material to the tip end side.

  The design of the rotation tool F for joining can be changed as appropriate. FIG. 3 is a side view showing a first modification of the rotating tool according to the present invention. As shown in FIG. 3, in the final joining rotary tool FA according to the first modification, the step angle C formed by the step bottom surface F21a and the step side surface F21b of the step portion F21 is 85 °. The step bottom surface F21a is parallel to the horizontal plane. As described above, the step bottom surface F21a is parallel to the horizontal plane, and the step angle C may be an acute angle in a range in which the plastic fluid material stays inside the step portion F21 during friction stirring and falls out without adhering.

  FIG. 4 is a side view showing a second modification of the main joining rotary tool of the present invention. As shown in FIG. 4, in the main joining rotary tool FB according to the second modification, the step angle C of the step portion F21 is 115 °. The step bottom surface F21a is parallel to the horizontal plane. As described above, the step bottom surface F21a may be parallel to the horizontal plane, and the step angle C may be an obtuse angle within a range that functions as the step portion F21.

  FIG. 5 is a side view showing a third modification of the rotary tool for joining of the present invention. As shown in FIG. 5, in the final joining rotary tool FC according to the third modification, the step bottom surface F21a is inclined upward by 10 ° with respect to the horizontal plane from the rotation axis of the tool toward the outer peripheral direction. The step side surface F21b is parallel to the vertical plane. As described above, the step bottom surface F21a may be formed so as to incline above the horizontal plane from the rotation axis of the tool toward the outer peripheral direction as long as the plastic flow material can be suppressed during friction stirring. The same effects as those of the following embodiments can also be obtained by the first to third modifications of the above-described rotary tool for joining.

[First embodiment]
Next, the heat transfer plate of the present embodiment will be described. In the following description, “front surface” means a surface opposite to “back surface”. As shown in FIG. 6, the heat transfer plate 1 according to the present embodiment mainly includes a base member 2 and a cover plate 5. The base member 2 has a substantially rectangular parallelepiped shape. A concave groove 3 and a lid groove 4 are formed in the base member 2. The material of the base member 2 and the cover plate 5 is not particularly limited as long as it can be frictionally stirred. In the present embodiment, the material is an aluminum alloy. The base member 2 is formed of, for example, a material having a higher hardness than the cover plate 5.

  The concave groove 3 penetrates from one side to the other side at 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 open to the surface 2 a side of the base member 2.

  The lid groove 4 is wider than the concave groove 3, and is formed on the surface 2 a side of the concave groove 3 so as to be continuous with the concave groove 3. The cover groove 4 has a rectangular shape in cross section, and is open to the front surface 2a side.

  The cover plate 5 is a plate-like member inserted into the cover groove 4. The cover plate 5 has the same shape as the hollow portion of the cover groove 4 so as to be inserted into the cover groove 4 without any gap.

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

  Next, a method for manufacturing the heat transfer plate according to the first embodiment will be described. In the method of manufacturing a heat transfer plate, a preparation step, a lid plate insertion step, a tab material arranging step, a temporary joining step, a main joining step, and a straightening step are performed.

  As shown in FIG. 7A, the preparation step is a step 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 lid groove 4 are formed by cutting using an end mill or the like. Note that the base member 2 in which the concave groove 3 and the lid groove 4 are formed in advance by die casting or extrusion molding may be used.

  As shown in FIG. 7B, the cover plate inserting step is a step of inserting the cover plate 5 into the cover groove 4. The side wall of the cover groove 4 and the side surface of the cover plate 5 are respectively butted to form butted portions J. The upper surface of the cover plate 5 and the surface 2a are flush.

  As shown in FIG. 8, the tab member arranging step is a step of arranging the tab members 10 on the side surface of the base member 2. The tab material 10 is a member for setting a start position and an end position of friction stirring described later. The tab member 10 is in surface contact with the opposing side surface of the base member 2 and is arranged on an extension of the butted portions J, J. In the present embodiment, the tab material 10 is formed of an aluminum alloy, which is a material equivalent to that of the base member 2. The tab member 10 is joined by welding the corners between the tab member 10 and the base member 2.

  As shown in FIG. 9A, the temporary joining step is a step of performing preliminary friction stir welding on the butted portions J and J. In the temporary joining step, a rotating tool G for temporary joining is used. In the present embodiment, the temporary joining rotary tool G is a smaller rotating tool than the final joining rotary tool F. The temporary joining rotary tool G mainly includes a base shaft portion G1, a base end side pin G2, and a front end side pin G3. The start position and the end position of the temporary joining step are not particularly limited as long as they are on the surfaces of the base member 2 and the tab material 10, but are set on the surface of the tab material 10 in the present embodiment.

  Specifically, the start position of the temporary joining step is set on the surface of one tab material 10, and friction stir welding is performed on the entire length of one butt portion J. In the temporary joining step, friction stir welding is performed in a state where the base end side pin G2 and the tip end side pin G3 are in contact with the base member 2 and the cover plate 5. Friction stir welding is performed while the distal end pin G3 of the rotating temporary joining rotary tool G is inserted into the abutting portion J and the base member 2 and the cover plate 5 are pressed by the outer peripheral surface of the proximal end pin G2. The rotating tool G for temporary joining is relatively moved along the butting portion J. The insertion depth of the proximal-side pin G2 and the distal-side pin G3 may be appropriately set within a range where the outer peripheral surface of the proximal-side pin G2 can hold down the base member 2 and the cover plate 5. For example, the insertion depth of the proximal-side pin G2 and the distal-side pin G3 is a range in which the outer peripheral surface of the proximal-side pin G2 can hold down the base member 2 and the cover plate 5, and the distal-side pin G3 May reach the lid groove 4. In the present embodiment, the base pin 2 is set so that the outer peripheral surface of the proximal end pin G <b> 2 comes into contact with the base member 2 and the cover plate 5 near the center in the height direction. A plasticizing region W1 is formed on the movement locus of the rotary tool G for temporary joining. After the temporary joining rotary tool G is moved to the other tab member 10, it is folded back on the surface of the tab member 10 as it is, and friction stir welding is performed on the entire length of the other butt portion J. When the temporary joining rotary tool G is moved to the one tab member 10, the temporary joining rotary tool G is separated from the tab member 10.

  As shown in FIG. 9B, the main joining step is a step of performing friction stir welding on the butted portions J, J using the main joining rotary tool F. It is preferable that the start position and the end position of the main joining step be set on the surface of the tab material 10. When inserting the final joining rotary tool F into the tab material 10, the hole of the temporary joining rotary tool G may be used, or a separate prepared hole may be provided in the tab material 10, and the prepared hole may be inserted through the prepared hole. A rotating tool F for joining may be inserted.

  In the main joining step, the friction stir welding is performed in a state where the base end side pin F2 and the front end side pin F3 are in contact with the base member 2 and the cover plate 5. The friction stir welding is performed while the distal end pin F3 of the rotating main joining rotary tool F is inserted into the abutting portion J and the base member 2 and the cover plate 5 are pressed by the outer peripheral surface of the proximal end pin F2. The rotating tool F for full joining is relatively moved along the butting portion J. The insertion depth of the proximal-side pin F2 and the distal-side pin F3 may be appropriately set within a range where the outer peripheral surface of the proximal-side pin F2 can hold down the base member 2 and the cover plate 5. For example, the insertion depth of the proximal-side pin F2 and the distal-side pin F3 is in a range where the outer peripheral surface of the proximal-side pin F2 can hold down the base member 2 and the cover plate 5, and the distal-side pin F3 May reach the lid groove 4. In the present embodiment, the base pin F2 is set so that the vicinity of the center in the height direction of the outer peripheral surface of the proximal end pin F2 contacts the base member 2 and the cover plate 5. A plasticized region W is formed on the movement trajectory of the rotary tool F for full joining. When the main joining step is completed, the tab member 10 is cut off from the base member 2.

  After the temporary joining step and the main joining step, a burr removing step of removing burr generated by friction stirring may be performed. By performing the deburring step, the surfaces of the base member 2 and the cover plate 5 can be finely finished.

  Here, FIG. 10A is a perspective view showing a state after performing the main bonding step in the method for manufacturing a heat transfer plate according to the first embodiment, and FIG. 10B is a line connecting points d and e in FIG. 10A. FIG. The plasticized regions W, W are formed in the heat transfer plate 1 by the main joining process. Since the plasticized region W shrinks due to thermal contraction, a compressive stress acts on the surface 2a of the base member 2 from each corner of the base member 2 toward the center. As a result, the heat transfer plate 1 may be warped such that the surface 2a side is concave. In particular, among points a to j shown on the surface 2a of the base member 2, at points a, c, f, and h related to the four corners of the heat transfer plate 1, the influence of the warp tends to appear remarkably. Note that the point j indicates the center point of the heat transfer plate 1.

  In the straightening step, the bending of the heat transfer plate 1 formed in the above-described joining step is straightened by applying a bending moment such that a tensile stress is generated from the back surface 2b of the base member 2 to the front surface 2a side of the base member 2. I do. In the straightening step, any one or more of the following three methods of press straightening, hitting straightening, and roll straightening may be selected and performed. First, press straightening will be described.

  As shown in FIG. 11, the back surface 2b of the base member 2 is turned upside down, and the plate-shaped first auxiliary member T1 is arranged at the center point j '(see FIG. 10B) of the back surface 2b. Further, plate-like second auxiliary members T2, T2 and third auxiliary members T3, T3 are arranged at four corners on the surface 2a side of the base member 2. That is, the second auxiliary member T2 and the third auxiliary member T3 are arranged on both lateral sides with the first auxiliary member T1 interposed therebetween.

  The first to third auxiliary members T1 to T3 are members that serve as a patch or a pedestal when performing press correction, and are members that prevent the heat transfer plate 1 from being damaged. The first to third auxiliary members T1 to T3 are preferably made of a material softer than the heat transfer plate 1. For example, an aluminum alloy, hard rubber, plastic, or wood can be used. In addition, the first auxiliary member T1 to the third auxiliary member T3 are set to have a thickness sufficient to deflect the warp and correct the warp according to the mechanical characteristics of the heat transfer plate 1 and the curvature of the warp. do it.

  After each auxiliary member is arranged, as shown in FIGS. 12A and 12B, the auxiliary member is pressed from the back surface 2 b of the base member 2 using a known press device P. That is, the punch Pa of the press device P is pressed against the first auxiliary member T1, and pressed with a predetermined pressing force. When pressure is applied to the heat transfer plate 1 by the press device P, as shown in FIGS. 12A and 12B, the first auxiliary member T1 pushes the heat transfer plate 1 downward, and the second auxiliary member T2 and the third auxiliary member T2. Since the member T3 pushes both ends of the heat transfer plate 1 upward, a bending moment acts on the heat transfer plate 1. Since this bending moment generates a tensile stress on the surface 2a side of the base member 2, the heat transfer plate 1 is forcibly bent downward.

  The pressing force of the pressing device P may be appropriately set according to the thickness and the material of the heat transfer plate 1. However, as shown in FIG. 12B, the surface 2a side of the base member 2 is convex downward, and the tensile stress is applied to the surface 2a. It is preferable to apply a bending moment such that the bending moment occurs.

  Further, in the present embodiment, as shown in FIG. 13, not only the center point j 'but also the vicinity of the points b', d ', e', and g 'on the back surface 2b of the base member 2 are pressed. Do. That is, the first auxiliary member T1 is disposed at positions H2 to H5 including the points b ′, d ′, e ′, and g ′, which are intermediate points of the sides on the back surface 2b of the base member 2, Pressing is performed by the press device P. Thereby, the heat transfer plate 1 can be corrected in a well-balanced manner, and the flatness can be further improved.

  In this embodiment, the pressing positions are set at five positions. However, the pressing positions are not limited to five positions, and may be set as appropriate according to the warpage of the heat transfer plate 1 caused by the joining process.

  Next, the impact correction will be described. Since the impact correction is similar to the press correction, a specific illustration is omitted. The hitting correction refers to correcting the warpage generated in the heat transfer plate 1 by using a hitting tool such as a hammer. The impact correction is substantially the same as the press correction except that the heat transfer plate 1 is impacted with an impact tool such as a hammer instead of the press device P.

  In the impact correction, after the auxiliary member is arranged in the same manner as the press correction, as shown in FIGS. 12A, 12B and 13, the heat transfer plate is pressed from the back surface 2b of the base member 2 with an impact tool such as a plastic hammer. Hit 1 When the heat transfer plate 1 is hit, a tensile stress is generated on the surface 2a side of the base member 2, so that the heat transfer plate 1 is forcibly bent downwardly (see FIG. 12B). Thereby, the warpage of the heat transfer plate 1 can be corrected and flattened. Further, similarly to the press correction, the heat transfer plate 1 can be corrected in a well-balanced manner by hitting the positions H2 to H5 of the back surface 2b of the base member 2 as necessary.

  In the impact correction, since the labor for preparing the press device P and the like can be omitted as compared with the press correction, the operation can be easily performed. The impact correction is effective when the heat transfer plate 1 is small or thin because the work is easy. After the impact correction is completed, it is preferable to remove burrs generated by the impact.

  Next, the roll correction will be described. As shown in FIG. 14A, when the above-described joining step is completed, the burrs generated by the friction stirring are removed, and the back surface 2b of the base member 2 is turned over so as to face upward, including the center point j ′ of the back surface 2b. The long plate-shaped first auxiliary member T1 is arranged so as to be parallel to the longitudinal direction. Further, a long plate-shaped second auxiliary member T2 and a third auxiliary member T3 are arranged so as to be parallel to the longitudinal direction at the edge on the surface 2a side of the base member 2. That is, the second auxiliary member T2 and the third auxiliary member T3 are arranged on both sides of the first auxiliary member T1.

  Then, the roll R1 is disposed above the first auxiliary member T1 so as to be orthogonal to the first auxiliary member T1, and the second auxiliary member T2 and the third auxiliary member T3 are provided below the second auxiliary members T2 and T3. The roll R2 is arranged to be orthogonal. That is, as shown in FIG. 14B, the heat transfer plate 1 is disposed between the rolls R1 and R2 in a state of being convex upward, and is disposed on the rolls R1 and R2 via the first to third auxiliary members T1 to T3. Be pinched.

  The first auxiliary member T1 to the third auxiliary member T3 are members for preventing the heat transfer plate 1 from being damaged, as well as being a contact material when performing roll correction. The first to third auxiliary members T1 to T3 may be any material that is softer than the heat transfer plate 1, and for example, may be an aluminum alloy, hard rubber, plastic, or wood.

  Here, when the rolls R1 and R2 approach each other and apply pressure to the heat transfer plate 1, the first auxiliary member T1 pushes the heat transfer plate 1 downward, as shown in FIGS. Since the member T2 and the third auxiliary member T3 push both ends of the heat transfer plate 1 upward, a bending moment acts on the heat transfer plate 1. Since this bending moment generates a tensile stress on the surface 2a side of the base member 2, the heat transfer plate 1 is forcibly bent downward.

  As shown in FIG. 14A, when the roll R1 rotates in the direction of the arrow α and the roll R2 rotates in the direction of the arrow β, the rolls R1 and R2 move in the direction of the arrow γ with respect to the heat transfer plate 1 (roll feed direction). Move relative to. When the roll R1 rotates in the arrow β direction and the roll R2 rotates in the arrow α direction, the rolls R1 and R2 move relatively to the heat transfer plate 1 in the arrow δ direction (roll feed direction).

  Therefore, since the position of the bending moment acting on the heat transfer plate 1 changes with the relative movement, the entire heat transfer plate 1 is forcibly bent downward. Therefore, it is possible to correct the warpage by repeatedly reciprocating the relative movement. In addition, the first auxiliary member T1 to the third auxiliary member T3 are set to have a thickness sufficient to deflect the warp and correct the warp according to the mechanical characteristics of the heat transfer plate 1 and the curvature of the warp. do it.

  Moreover, after performing the straightening process by rotating the rolls R1 and R2 in the longitudinal direction of the heat transfer plate 1, the rolls R1 and R2 may be rotated in the lateral direction. That is, the first auxiliary member T1 to the third auxiliary member T3 are arranged so as to be parallel to the horizontal direction, and the rolls R1 and R2 are arranged so as to be orthogonal to the first auxiliary member T1 to the third auxiliary member T3. I do. Then, the rolls R1 and R2 are reciprocated in the lateral direction. Thereby, the heat transfer plate 1 can be corrected in a well-balanced manner.

  Also, here, the distortion correction step is described with the back surface 2b of the base member 2 facing upward, but the distortion correction step may be performed with the front surface 2a facing upward without turning over. In this case, since each of the above-described components appears symmetrically, description thereof will be omitted.

  Here, for example, as shown in FIG. 15A, in the case of the conventional rotary tool 200, the shoulder portion does not press the surface of the metal member 210 to be joined, so that the stepped groove (the surface of the metal member to be joined and the plasticized region There is a problem that the step recess groove formed by the surface and the surface becomes large and the joining surface roughness becomes large. In addition, there is a problem that a bulging portion (a portion where the surface of the metal member to be bonded bulges compared to before the bonding) is formed beside the stepped groove. On the other hand, when the taper angle θ2 of the rotary tool 201 is larger than the taper angle θ1 of the rotary tool 200 as in the rotary tool 201 of FIG. 15B, the surface of the metal member 210 to be joined can be pressed as compared with the rotary tool 200. Therefore, the step recess groove becomes small, and the bulging portion also becomes small. However, since the downward plastic flow becomes strong, a kissing bond is easily formed below the plasticized region.

  On the other hand, the main joining rotary tool F of the present embodiment has a configuration including the proximal-side pin F2 and the distal-side pin F3 having a taper angle smaller than the taper angle A of the proximal-side pin F2. . Thereby, it becomes easy to insert the rotary tool F for full joining into the butt portion J. In addition, since the taper angle B of the distal end side pin F3 is small, the rotary tool F for full joining can be easily inserted to a deep position of the abutting portion J. Further, since the taper angle B of the distal end side pin F3 is small, the downward plastic flow can be suppressed as compared with the rotating tool 201. For this reason, it is possible to prevent a kissing bond from being formed below the plasticized region W. On the other hand, since the taper angle A of the base end side pin F2 is large, the bonding can be performed more stably even when the thickness of the metal member to be bonded or the height position of the bonding changes as compared with the conventional rotary tool.

  Further, since the plastic flow material can be pressed by the outer peripheral surface of the base end side pin F2, the stepped groove formed on the joint surface can be reduced, and the bulging portion formed beside the stepped groove. Can be eliminated or reduced. In addition, since the step-shaped step portion F21 is shallow and has a wide exit, the plastic flow material easily escapes to the outside of the step portion F21 while holding the plastic flow material at the step bottom surface F21a. For this reason, even if the plastic flow material is pressed by the proximal end pin F2, the plastic flow material does not easily adhere to the outer peripheral surface of the proximal end pin F2. Therefore, the joining surface roughness can be reduced, and the joining quality can be suitably stabilized.

  Further, even if the heat transfer plate 1 is bent by the heat shrinkage in the main joining step, the warp formed in the main joining step and protruding toward the back surface 2b of the base member 2 is applied to the front surface 2a side of the base member 2. It is corrected by applying a bending moment that generates a tensile stress. Thereby, the warpage due to the heat shrinkage formed in the main bonding step can be reduced, and the flatness of the heat transfer plate 1 can be improved.

  In addition, in the main joining step, it is not always necessary to perform friction stirring over the entire length of the butt portions J and J in the depth direction. 1 can improve water tightness and air tightness.

  Further, by performing the temporary joining step, it is possible to prevent the opening between the base member 2 and the cover plate 5 when performing the main joining step. Also, in the temporary joining step, the plastic flow material can be held down on the outer peripheral surface of the base end side pin G2, so that the stepped groove formed on the joint surface can be reduced and formed beside the stepped groove. The bulging portion to be formed can be eliminated or reduced. Further, even in the rotary tool G for temporary joining, since the step-shaped step portion is shallow and the outlet is wide, the plastic flow material easily escapes to the outside of the step portion while holding the plastic flow material on the step bottom surface. Therefore, even if the plastic flow material is pressed by the proximal end pin G2, the plastic flow material does not easily adhere to the outer peripheral surface of the proximal end pin G2. Therefore, the joining surface roughness can be reduced, and the joining quality can be suitably stabilized. In addition, in the temporary joining step and the final joining step, the rotating tool G for temporary joining and the rotating tool F for final joining are not separated from the base member 2 during the friction stirring, and each rotating tool is moved in a one-stroke manner. , Work time can be reduced.

  In the temporary joining step, the friction stir may be performed discontinuously so that the plasticized region W1 by the temporary joining rotary tool G is formed intermittently. Alternatively, the temporary joining may be performed using the rotating tool F for the final joining. Thereby, the trouble of changing the rotating tool can be omitted. In the temporary joining step, the butt portions J may be joined by welding. Alternatively, the tab material 10 and the base member 2 may be temporarily joined by using the temporary joining rotating tool G.

(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 a heat medium tube 6 is provided. The heat medium tube 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 step, a heat medium tube insertion step, a cover plate insertion step, a temporary joining step, a main joining step, and a straightening step are performed.

  As shown in FIG. 16A, the preparation step is a step of preparing the base member 2.

  As shown in FIG. 16B, the heat medium tube insertion step is a step of inserting the heat medium tube 6 into the concave groove 3. The size and the like of the concave groove 3 and the heat medium tube 6 may be appropriately set, but in this embodiment, the outer diameter of the heat medium tube 6 and the width and depth of the concave groove 3 are substantially equal. I have.

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

  The temporary joining step is a step of preliminarily joining the butting portions J, J using the rotating tool G for temporary joining. The temporary joining step is performed in the same manner as in the first embodiment.

  As shown in FIG. 17, the main joining step is a step of performing friction stir welding on the butted portions J, J using the main joining rotary tool F. The main bonding step is performed in the same manner as in the first embodiment. Plasticized regions W, W are formed on the movement locus of the rotary tool F for full joining. The plasticized region W is formed over the entire length of the butted portions J, J in the depth direction.

  Next, in the correction step, a correction step of applying a bending moment such that a tensile stress acts on the surface 2a of the base member 2 is performed. The correction process is performed in the same manner as in the first embodiment.

  With the method for manufacturing a heat transfer plate according to the second embodiment, substantially the same effects as in the first embodiment can be achieved. Further, the heat transfer plate 1A including the heat medium tubes 6 can be easily manufactured.

  Further, for example, the shapes of the concave groove 3, the cover groove 4, the cover plate 5, and the heat medium tube 6 according to the first embodiment and the second embodiment are merely examples, and may be other shapes. . In addition, when a step is generated between the surface 2a of the base member 2 and the surface of the plasticized region W after the main joining step, build-up welding may be performed to fill the step. 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 by the rotating tool F for final welding.

  Further, in the present embodiment, the case where the cover groove 4 is provided is exemplified, but the cover plate 5 may be inserted directly into the concave groove 3 without providing the cover groove 4.

  In addition, as shown in FIG. 17, when a gap Q is formed around the heat medium tube 6, the gap Q may be filled by the main joining step. In the cover plate inserting step, when the cover plate 5 is inserted into the cover groove 4, a gap portion Q is formed by the concave groove 3, the lower surface of the cover plate 5, and the heat medium pipe 6. The positions of the butting portions J and J are brought close to the heat medium pipe 6, and in the main joining step, the plastic fluid material formed by the main joining rotary tool F flows into the gap portion Q. Thereby, since the space Q around the heat medium pipe 6 is filled with the metal, the watertightness and the airtightness can be further improved.

  Further, after the temporary bonding step and the main bonding step in the second embodiment, a burr cutting step for removing burrs generated in each step may be performed.

(Third embodiment)
Next, a third embodiment of the present invention will be described. The method of manufacturing the heat transfer plate according to the third embodiment differs from the first embodiment in that the cover groove 4 is not formed in the base member 2 and the cover plate 5 is placed on the surface 2 a of the base member 2. I do.

  In the method for manufacturing a heat transfer plate according to the third embodiment, a preparation step, a groove closing step, a temporary joining step, a main joining step, and a straightening step are performed.

  As shown in FIG. 18A, 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 groove closing step (closing step) is a step 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 groove closing step, the front surface 2a of the base member 2 and the back surface 5b of the lid plate 5 are overlapped to form the overlapped portion J1.

  The temporary joining step is a step of preliminarily joining the overlapping portion J1 using the rotating tool G for temporary joining. In the temporary joining step, in the present embodiment, the tip side pin G3 of the temporary joining rotary tool G is inserted from the side surfaces of the base member 2 and the cover plate 5, and friction stir welding is performed on the overlapping portion J1. In the temporary joining step, friction stir welding is performed while holding the side surfaces of the base member 2 and the cover plate 5 with the outer peripheral surface of the base end side pin G2. In the temporary joining step, friction stir welding is performed in a state where the base end pin G2 and the tip end pin G3 are in contact with both the base member 2 and the cover plate 5. The insertion depth of the proximal-side pin G2 and the distal-side pin G3 may be appropriately set within a range in which the outer peripheral surface of the proximal-side pin G2 can press the side surfaces of the base member 2 and the cover plate 5. In the present embodiment, the distal end pin G3 contacts the base member 2 and the lid plate 5 while the center portion of the outer peripheral surface of the proximal end pin G2 in the height direction contacts the side surfaces of the base member 2 and the lid plate 5. Set to After the temporary joining step, a plasticized region W1 is formed on the side surfaces of the base member 2 and the cover plate 5.

  As shown in FIG. 18B, the main joining step is a step of performing friction stir welding on the overlapping portion J1 using the main joining rotary tool F. Insert the front end pin F3 of the rotating main joining rotary tool F from the surface 5a of the cover plate 5 and relatively move the main joining rotary tool F along the longitudinal direction of the concave groove 3 to rub the overlapping portion J1. Stir welding. The moving route of the main joining rotary tool F is set so that the plastic fluid does not flow into the concave groove 3.

  In the main joining step, friction stir welding is performed while pressing the surface 5a of the cover plate 5 with the outer peripheral surface of the base end side pin F2. In the main joining step, the friction stir welding is performed in a state where the proximal pin F2 is in contact with the cover plate 5 and the distal pin F3 is in contact with both the base member 2 and the cover plate 5. The insertion depth of the proximal-side pin F2 and the distal-side pin F3 may be appropriately set within a range in which the outer peripheral surface of the proximal-side pin F2 can hold down the surface 5a of the cover plate 5. In the present embodiment, the distal end pin F3 is set so as to be in contact with the base member 2 while the vicinity of the center in the height direction of the outer peripheral surface of the proximal end pin F2 is in contact with the surface 5a of the cover plate 5.

  Next, in the correcting step, a correcting step of applying a bending moment such that a tensile stress acts on the surface 5a of the cover plate 5 is performed. The correction process is performed in the same manner as in the first embodiment. Even in this case, substantially the same effects as in the first embodiment can be obtained.

  As in the method of manufacturing the heat transfer plate according to the third embodiment, even when the cover groove 5 is not provided and the thick cover plate 5 is placed on the surface 2 a of the base member 2, 1B can be easily manufactured. Further, by performing the temporary joining step, it is possible to prevent the opening between the base member 2 and the cover plate 5 when performing the main joining step. Also, in the temporary joining step, the plastic flow material can be held down on the outer peripheral surface of the base end side pin G2, so that the stepped groove formed on the joint surface can be reduced and formed beside the stepped groove. The bulging portion to be formed can be eliminated or reduced. Further, even in the rotary tool G for temporary joining, since the step-shaped step portion is shallow and the outlet is wide, the plastic flow material easily escapes to the outside of the step portion while holding the plastic flow material on the step bottom surface. Therefore, even if the plastic flow material is pressed by the proximal end pin G2, the plastic flow material does not easily adhere to the outer peripheral surface of the proximal end pin G2. Therefore, the joining surface roughness can be reduced, and the joining quality can be suitably stabilized.

  In the temporary joining step, the friction stir may be performed discontinuously so that the plasticized region W1 by the temporary joining rotary tool G is formed intermittently. Alternatively, the temporary joining may be performed using the rotating tool F for the final joining. Thereby, the trouble of changing the rotating tool can be omitted. In the temporary joining step, the overlapped portion J1 may be joined by welding. Moreover, you may perform a temporary joining process and a full joining process using a tab material like 1st embodiment.

  Further, in the present embodiment, the distal end pin F3 is set so as to be pushed to the position where it reaches the base member 2. However, the distal end pin F3 is set so as not to reach the base member 2, that is, the proximal end pin F2 and the distal end side. The insertion depth may be set so that both of the pins F3 are in contact with only the cover plate 5. In such a case, the overlapping portion J1 is plastically fluidized by friction heat generated by the contact between the base end side pin F2 and the distal end side pin F3 and the cover plate 5, so that the overlapping portion J1 is joined.

  Further, in the present embodiment, the main joining rotary tool F is inserted from the front surface 5a of the cover plate 5, but the main joining rotary tool F is inserted from the back surface 2b of the base member 2 to frictionally stir the overlapping portion J1. You may do so. In this case, the final joining step of inserting the distal end pin F3 from the back surface 2b of the base member 2 to perform friction stir welding is performed, and the straightening process is performed so that tensile stress is generated on the back surface 2b of the base member 2. Even in this case, substantially the same effects as in the third embodiment can be obtained. Further, even in such a case, the distal end side pin F3 may be pushed to a position in contact with both the base member 2 and the cover plate 5, or may be pushed to a position in contact with only the base member 2 to form the overlapping portion. J1 may be set to be frictionally stirred.

  Further, after the temporary bonding step and the main bonding step in the third embodiment, a burr cutting step for removing burrs generated in each step may be performed.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described. The method for manufacturing a heat transfer plate according to the fourth embodiment differs from the third embodiment in that a concave portion 20 having a large depression is formed.

  The method for manufacturing a heat transfer plate according to the fourth embodiment includes a preparation step, a closing step, a temporary joining step, a main joining step, and a straightening step.

  As shown in FIG. 19A, 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 recess closing step (closing step) is a step of placing the cover plate 5 on the surface 2 a of the base member 2 to cover the upper part of the recess 20. In the recess closing step, the front surface 2a of the base member 2 and the back surface 5b of the lid plate 5 are overlapped to form the overlapped portion J1. As shown in FIG. 19B, the temporary bonding step, the main bonding step, and the correction step are the same as those in the third embodiment, and thus detailed description will be 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 effects as in the third embodiment can be obtained. Further, according to the fourth embodiment, even when the cover plate 5 having the concave portion 20 larger than the concave groove 3 and having a large thickness is placed, the heat transfer plate 1C can be easily formed. .

  In the present embodiment, the distal end pin F3 is set so as to be pushed down to the position where it reaches the base member 2. However, the distal end pin F3 is set so as not to reach the base member 2, that is, the proximal end pin F2 and the distal end side. The overlapping portion J1 may be set so as to be frictionally stirred by pushing the pin F3 to the position where only the cover plate 5 contacts. In such a case, the base member 2 and the lid plate 5 are plastically fluidized by the frictional heat generated by the contact between the proximal end pin F2 and the distal end side pin F3 and the lid plate 5, so that the overlapping portion J1 is formed. Joined.

  Further, in the present embodiment, the main joining rotary tool F is inserted from the front surface 5a of the cover plate 5, but the main joining rotary tool F is inserted from the back surface 2b of the base member 2 to frictionally stir the overlapping portion J1. You may do so. In this case, the final joining step of inserting the distal end pin F3 from the back surface 2b of the base member 2 to perform friction stir welding is performed, and the straightening process is performed so that tensile stress is generated on the back surface 2b of the base member 2. Even in this case, substantially the same effects as in the fourth embodiment can be obtained. Also in this case, the distal end side pin F3 may be pushed into a position in contact with both the base member 2 and the cover plate 5, or may be pushed into a position in contact with only the base member 2 so as to stir frictionally. May be set.

  Further, after the temporary bonding step and the main bonding step in the fourth embodiment, a burr cutting step for removing burrs generated in each step may be performed.

(Fifth embodiment)
Next, a friction stir welding method according to a fifth embodiment of the present invention will be described. The fifth embodiment is different from the other embodiments in that metal members having no flow path such as the concave groove 3 and the concave portion 20 are joined to each other.

  In the friction stir welding method according to the fifth embodiment, a preparation step, a superposition step (overlapping section forming step), a temporary joining step, a main joining step, and a straightening step are performed.

  As shown in FIG. 20, the preparation step is a step of preparing metal members 31, 32. The metal members 31 and 32 are plate-shaped metal members. The type of the metal members 31 and 32 may be appropriately selected from friction stirable metals. For example, the grade of the metal member 32 into which the rotary tool F for full joining is inserted may be a grade having a lower hardness than the metal member 31.

  The superposition step (superposition section forming step) is a step of superposing the metal members 31 and 32. In the superposition step, the back surface 32b of the metal member 32 is superimposed on the front surface 31a of the metal member 31 to form the overlapped portion J1.

  The temporary joining step is a step of preliminarily joining the overlapping portion J1 using the rotating tool G for temporary joining. In the temporary joining step, in this embodiment, the distal end side pin G3 of the temporary joining rotary tool G is inserted from the side surface of the metal member 31, 32, and friction stir welding is performed on the overlapping portion J1. In the temporary joining step, friction stir welding is performed while pressing the side surfaces of the metal members 31 and 32 with the outer peripheral surface of the base end side pin G2. In the temporary joining step, friction stir welding is performed in a state in which the proximal end pin G2 and the distal end pin G3 are in contact with both the metal members 31 and 32. The insertion depth of the proximal-side pin G2 and the distal-side pin G3 may be appropriately set within a range in which the outer peripheral surface of the proximal-side pin G2 can press the side surfaces of the metal members 31 and 32. In the present embodiment, the distal end pin G3 is set so as to contact the metal members 31 and 32 while contacting the center of the outer peripheral surface of the proximal end pin G2 in the height direction with the side surfaces of the metal members 31 and 32. I do. After the temporary joining step, the plasticized regions W1 are formed on the side surfaces of the metal members 31, 32.

  The main joining step is a step of performing friction stir welding on the overlapping portion J1 using the main joining rotary tool F. In the present embodiment, the tip pin F3 of the rotating main joining rotary tool F is vertically inserted from the surface 32a of the metal member 32, and the tip of the tip pin F3 is set so as to enter the metal member 31. Then, the overlapping tool J1 is friction stir welded by relatively moving the rotating tool F for welding. In the main joining step, friction stir welding is performed while pressing the surface 32a of the metal member 32 with the outer peripheral surface of the base end side pin F2. In the main joining step, the friction stir welding is performed in a state where the distal end pin F3 is in contact with both of the metal members 31 and 32 while the proximal end pin F2 is in contact with the metal member 32.

  In the correction process, the metal members 31 and 32 are turned over, and the correction process is performed. The correction process is performed in the same manner as in the first embodiment. Thereby, the composite board 1D is formed.

  According to the friction stir welding method according to the fifth embodiment, a composite plate 1D having no flow path therein can be easily formed. With the friction stir welding method according to the fifth embodiment, substantially the same effects as in the third embodiment can be obtained.

  Further, by performing the temporary bonding step, it is possible to prevent the openings between the metal members 31 and 32 when performing the main bonding step. Also, in the temporary joining step, the plastic flow material can be held down on the outer peripheral surface of the base end side pin G2, so that the stepped groove formed on the joint surface can be reduced and formed beside the stepped groove. The bulging portion to be formed can be eliminated or reduced. Further, even in the rotary tool G for temporary joining, since the step-shaped step portion is shallow and the outlet is wide, the plastic flow material easily escapes to the outside of the step portion while holding the plastic flow material on the step bottom surface. Therefore, even if the plastic flow material is pressed by the proximal end pin G2, the plastic flow material does not easily adhere to the outer peripheral surface of the proximal end pin G2. Therefore, the joining surface roughness can be reduced, and the joining quality can be suitably stabilized.

  In the temporary joining step, the friction stir may be performed discontinuously so that the plasticized region W1 by the temporary joining rotary tool G is formed intermittently. Alternatively, the temporary joining may be performed using the rotating tool F for the final joining. Thereby, the trouble of changing the rotating tool can be omitted. In the temporary joining step, the overlapped portion J1 may be joined by welding. Moreover, you may perform a temporary joining process and a full joining process using a tab material like 1st embodiment.

  In addition, as shown in FIG. 21, when performing the main joining step, the distal-side pin F3 is prevented from reaching the metal member 31, that is, the proximal-side pin F2 and the distal-side pin F3 are connected to only the metal member 32. Friction agitation may be performed by setting to be in contact. In such a case, the metal members 31, 32 can be joined to each other by bringing the plasticized region W into contact with the overlapped portion J1. That is, the metal members 31 and 32 are plastically fluidized by the frictional heat generated by the contact between the base end side pin F2 and the front end side pin F3 and the metal member 32, so that the overlapped portion J1 can be joined. Thereby, the composite board 1E is formed.

  Further, after performing the temporary bonding step and the main bonding step, a burr removal step of removing burr generated in each step may be performed.

REFERENCE SIGNS LIST 1 heat transfer plate 2 base member 3 concave groove 4 lid groove 5 lid plate 6 tube for heat medium 10 tab material 20 concave portion 31 metal member 32 metal member F Rotation tool (rotation tool) for final joining
F2 Base end pin F3 Tip side pin G Rotary tool for temporary joining J Butt joint J1 Overlapping part W Plasticized area

Claims (12)

A lid plate inserting step of inserting a lid plate into a lid groove formed around a concave groove opening on the surface of the base member,
A main joining step of relatively moving a main joining rotary tool having a base end pin and a front end side pin along a butt portion between the side wall of the lid groove and the side surface of the lid plate to perform frictional stirring,
Straightening step of correcting the warpage that is formed on the back side of the base member formed in the main joining step by applying a bending moment such that a tensile stress is generated on the front side of the base member. ,
The taper angle of the proximal pin is larger than the taper angle of the distal pin,
A step-shaped step portion is formed on the outer peripheral surface of the base side pin,
In the final joining step, a tip pin of the rotated final joining rotary tool is inserted into the butting portion, and friction stirring is performed in a state where an outer peripheral surface of the proximal pin is brought into contact with the base member and the lid plate. A method of manufacturing a heat transfer plate. A heat medium tube insertion step of inserting a heat medium tube into a concave groove formed on the bottom surface of the lid groove opening on the surface of the base member,
A lid plate inserting step of inserting a lid plate into the lid groove,
A main joining step of relatively moving a main joining rotary tool having a base end pin and a front end side pin along a butt portion between the side wall of the lid groove and the side surface of the lid plate to perform frictional stirring,
Straightening step of correcting the warpage that is formed on the back side of the base member formed in the main joining step by applying a bending moment such that a tensile stress is generated on the front side of the base member. ,
The taper angle of the proximal pin is larger than the taper angle of the distal pin,
A step-shaped step portion is formed on the outer peripheral surface of the base side pin,
In the final joining step, a tip pin of the rotated final joining rotary tool is inserted into the butting portion, and friction stirring is performed in a state where an outer peripheral surface of the proximal pin is brought into contact with the base member and the lid plate. A method of manufacturing a heat transfer plate.   The method for manufacturing a heat transfer plate according to claim 1 or 2, further comprising a temporary joining step of temporarily joining the butted portions before the main joining step. A closing step of superposing a lid plate on the surface of the base member so as to cover a concave groove or a concave portion opened on the surface of the base member,
From the surface of the lid plate, insert the full-joining rotary tool having a proximal pin and a distal pin, and move the full-joining rotary tool along the overlapping portion between the surface of the base member and the back surface of the lid plate. A main joining process of relative movement;
Straightening step of correcting the warpage that is convex on the back side of the base member formed by the main joining step by applying a bending moment such that tensile stress is generated on the front side of the lid plate. ,
The taper angle of the proximal pin is larger than the taper angle of the distal pin,
A step-shaped step portion is formed on the outer peripheral surface of the base side pin,
In the final joining step, the distal end pin of the rotated final joining rotary tool is inserted into the surface of the lid plate, and the outer peripheral surface of the proximal end pin is brought into contact with only the lid plate, while the distal end pin is A method of producing a heat transfer plate, wherein friction stir of the overlapping portion is performed in a state in which both the base member and the cover plate are in contact with each other or only the cover plate. A closing step of superposing a lid plate on the surface of the base member so as to cover a concave groove or a concave portion opened on the surface of the base member,
From the back surface of the base member, insert a full-joining rotary tool having a proximal-side pin and a distal-side pin, and move the full-joining rotary tool along an overlapping portion between the front surface of the base member and the back surface of the lid plate. A main joining process of relative movement;
Correcting the convexity formed on the front surface side of the lid plate formed by the main bonding step, by applying a bending moment such that a tensile stress is generated on the rear surface side of the base member. ,
The taper angle of the proximal pin is larger than the taper angle of the distal pin,
A step-shaped step portion is formed on the outer peripheral surface of the base side pin,
In the final joining step, the distal end pin of the rotated final joining rotary tool is inserted into the back surface of the base member, and the outer peripheral surface of the proximal end pin is brought into contact with only the base member, while the distal end pin is rotated. A method of producing a heat transfer plate, wherein friction stir of the overlapping portion is performed in a state in which both the base member and the cover plate are in contact with each other or only the base member.   The method for manufacturing a heat transfer plate according to claim 4, further comprising a temporary joining step of temporarily joining the overlapping portions before the main joining step.   7. The transmission according to claim 1, further comprising: after completion of the main joining step, removing a burr generated by friction stirring of the main joining rotary tool. 8. Hot plate manufacturing method. A friction stir welding method of joining two metal members using a rotating tool for final joining including a proximal pin and a distal pin,
A superposed portion forming step of forming a superposed portion by superposing the front surface of one of the metal members and the back surface of the other metal member,
A main joining step of inserting a tip side pin of the main joining rotary tool rotated from the surface of the other metal member, and relatively moving the main joining rotary tool along the overlapping portion to perform frictional stirring,
A straightening step of correcting a warp that is formed on the back side of one of the metal members formed by the main joining step by applying a bending moment such that a tensile stress is generated on the front side of the other metal member. And
The taper angle of the proximal pin is larger than the taper angle of the distal pin,
A step-shaped step portion is formed on the outer peripheral surface of the base side pin,
In the main joining step, the distal end pin of the rotated main joining rotating tool is inserted into the surface of the other metal member, and the outer peripheral surface of the base end pin is brought into contact only with the other metal member, A friction stir welding method, wherein the friction stir of the overlapped portion is performed in a state in which the tip side pin is in contact with both the one metal member and the other metal member, or only the other metal member. .   9. The friction stir welding method according to claim 8, further comprising a temporary joining step of temporarily joining the overlapping portions before the main joining step.   The friction stir welding method according to claim 8, further comprising: after completion of the main joining step, removing a burr generated by friction stirring of the rotating tool for main joining.   The warping is corrected in the correcting step by pressing and correcting the base member and the cover plate with a press corrector, a roll corrector, or an impact tool. 6. The method for producing a heat transfer plate according to any one of items 5 to 5.   9. The friction stir welding according to claim 8, wherein the warpage is corrected by pressing and correcting the one metal member and the other metal member with a press straightener, a roll straightener, or an impact tool. Method.

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