JP2020015065A - Method for manufacturing heat transfer plate and friction-agitation joint method - Google Patents

Abstract

To provide a method for manufacturing a heat transfer plate and a friction-agitation joint method which can reduce a step recessed groove on a surface of a metal member, and can also reduce joint surface roughness.SOLUTION: A taper angle of a base end side pin F2 of a rotary tool F for finish joining is larger than a taper angle of a tip end side pin F3, a stepwise step part is formed on the outer peripheral surface of the base end side pin F2, and the finish joint step includes inserting the tip end side pin F3 of the rotated rotary tool F for finish joining into an abutting part J while cooling a base member 2 and a lid plate 5 with a cooling plate K installed on a rear face 2b side of the base member 2, and performs friction-agitation while bringing the outer peripheral surface of the base end side pin F2 into contact with the base member 2 and the lid plate 5.SELECTED DRAWING: Figure 10B

Description

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

  Patent Literature 1 describes a method for manufacturing a heat transfer plate that performs heat exchange or the like by flowing a fluid through a flow path formed inside a base member. The base member has a lid groove that opens on the surface and a concave groove formed on the bottom surface of the lid groove. When manufacturing the heat transfer plate, the lid plate is arranged in the lid groove, and friction stir welding is performed on the abutting portion formed by the side surface of the lid plate and the side wall of the lid groove. In Patent Literature 1, friction stir welding is performed in a state where a rotating stirring pin is inserted into a butted portion and only the stirring pin is in contact with the base member and the cover plate. 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.

JP 2015-139800 A

  However, in the manufacturing method of Patent Literature 1, since the plastic fluid cannot be pressed by the shoulder portion, there is a problem that the stepped groove on the surface of the metal member 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 bulges compared to before the joining) is formed beside the stepped groove.

  From such a viewpoint, the present invention provides a method of manufacturing a heat transfer plate and a method of friction stir welding that can reduce the stepped groove on the surface of the metal member and reduce the surface roughness of the joint. That is the task.

  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 the main joining rotary tool including the base side pin and the distal end side pin along the abutting portion with the side surface of the lid plate to perform frictional stirring, and The taper angle of the proximal-side pin is larger than the taper angle of the distal-side pin, and a step-shaped step is formed on the outer peripheral surface of the proximal-side pin. While cooling the base member and the lid plate with a cooling plate installed on the back surface side of the base member, insert the distal end pin of the rotated main joining rotating tool into the butting portion, and The outer peripheral surface of the pin is connected to the base member and the lid plate. And performing friction stir while in contact.

  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. Wherein the taper angle of the proximal pin of the main joining rotary tool is larger than the taper angle of the distal pin, and the outer peripheral surface of the proximal pin has a stepped step. A part is formed, and in the main joining step, the tip side pin of the main joining rotary tool rotated while cooling the base member and the lid plate with a cooling plate installed on the back side of the base member. Into the butting portion, and the outer peripheral surface of the proximal side pin. And performing friction stir 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 a main joining rotary tool having a main joint and a relative movement of the main joining rotary tool along an overlapped portion of the front surface of the base member and the back surface of the lid plate. The taper angle of the proximal pin of the joining rotary tool is larger than the taper angle of the distal pin, and a stepped step portion is formed on the outer peripheral surface of the proximal pin, In the main joining step, while cooling the base member and the lid plate with a cooling plate installed on the back side of the base member, the tip pin of the rotated main joining rotating tool is rotated on the surface of the lid plate. Insert and out of the proximal pin While the surface is in contact with the surface of the lid plate, friction stir of the overlapping portion is performed in a state in which the tip side pin is in contact with both the base member and the lid plate, or only the lid plate. And

  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 a main joining rotary tool having a main joint and a relative movement of the main joining rotary tool along an overlapped portion of the front surface of the base member and the back surface of the lid plate. The taper angle of the proximal pin of the joining rotary tool is larger than the taper angle of the distal pin, and a stepped step portion is formed on the outer peripheral surface of the proximal pin, In the main joining step, while cooling the base member and the cover plate with a cooling plate installed on the front surface side of the lid plate, the tip pin of the rotated main joining rotating tool is attached to the back surface of the base member. Insert the proximal pin Performing frictional stirring of the overlapped portion in a state in which the distal end pin is in contact with both the base member and the lid plate, or only the base member while the outer peripheral surface of the base member is in contact with the back surface of the base member. It is characterized by.

  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 frictional stirring, and wherein a taper angle of the proximal pin of the main joining rotary tool is larger than a taper angle of the distal pin. A stepped step portion is formed on the outer peripheral surface of the base side pin, and in the main joining step, one of the metal members is formed by a cooling plate installed on the back surface side of one of the metal members. Member and the other metal part While cooling, insert the tip pin of the rotated rotary tool for final joining into the surface of the other metal member, while contacting the outer peripheral surface of the proximal pin to the surface of the other metal member, The friction stir of the overlapping portion is performed in a state where the distal end pin is in contact with both the one metal member and the other metal member, or only the other metal member.

  According to such a method, since at least one of 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. In addition, the bulge formed on the side of the stepped groove 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, the friction stir is performed while cooling the base member and the lid plate or the metal member with the cooling plate, so that the deformation of the heat transfer plate can be suppressed.

  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 such a manufacturing 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.

  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 groove on the surface of the metal member and 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 a perspective view which shows the fixation work to the cooling plate in the temporary joining process of the manufacturing method of the heat transfer plate which concerns on 1st 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. 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 of this invention, 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 for temporary bonding and a rotary tool for temporary bonding used in the bonding method according to the present embodiment will be described. The rotating tool for final welding and the rotating tool for temporary welding are tools used for friction stir welding. The rotary tool for temporary bonding and the rotary tool for temporary bonding in the present embodiment are the same except for the size. Therefore, the rotary tool for temporary bonding will be described here, and the description of the rotary tool for temporary bonding will be omitted. 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 during friction 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 rotary tool for permanent bonding of 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 for manufacturing a heat transfer plate, a preparation step, a lid plate insertion step, a tab material arranging step, a temporary joining step, and a main joining step are performed.

  As shown in FIG. 7A, the preparation step is a step of preparing the base member 2. In the preparation step, 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. 9, in the temporary joining step, first, the integrated base member 2, cover plate 5, and tab members 10, 10 are fixed to the table K. The table K is composed of a substrate K1 made of metal and having a rectangular parallelepiped, clamps K3 formed at four corners of the substrate K1, and cooling pipes WP disposed inside the substrate K1. The table K restrains the integrated base member 2, the lid plate 5, and the tab members 10, 10 so as not to move during the temporary bonding step and the main bonding step, and cools the base member 2 and the lid plate 5. . That is, the table K is a member that functions as a “cooling plate” in the claims. Here, the table K is arranged below the base member 2 to which the tab members 10 and 10 are attached.

  The cooling pipe WP is a tubular member buried inside the substrate K1. Inside the cooling pipe WP, a cooling medium for cooling the substrate K1 flows. Although the arrangement position of the cooling pipe WP, that is, the shape of the cooling channel through which the cooling medium flows, is not particularly limited, the moving locus of the temporary joining rotary tool G in the temporary joining step and the moving locus of the final joining rotary tool F in the final joining step are different. It has a planar shape along it. That is, the cooling pipe WP is disposed so that a part of the cooling pipe WP and the butting portions J and J substantially overlap when viewed in a plan view.

  As shown in FIG. 10A, the temporary joining step is a step of performing preliminary friction stir welding on the butted portions J, J using the rotating tool G for temporary joining. The temporary joining rotary tool G has the same shape as the main joining rotary tool F, and is smaller than the main joining rotary tool F. In the temporary joining step, a table K functioning as a cooling plate is arranged below the base member 2 to perform friction stir welding while cooling the base member 2 and the lid plate 5. 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. 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.

  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. 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.

  As shown in FIG. 10B, 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. In the main joining step, a table K functioning as a cooling plate is arranged below the base member 2 following the temporary joining step, and friction stir welding is performed while cooling the base member 2 and the cover plate 5. 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 rotary tool F for full joining is relatively moved along the butting portion J (that is, it is moved so as to trace the plasticized region W1 formed in the temporary joining step). 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. It is preferable that the distance between the abutting portion J and the concave groove 3 is set so that the plastic fluid does not flow into the concave groove 3 when the main joining step is performed. When the main joining step is completed, the tab member 10 is cut off from the base member 2.

  After the completion of 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, for example, as shown in FIG. 11A, 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 swells as compared to before the bonding) is formed beside the stepped groove. On the other hand, when the taper angle β of the rotating tool 201 is larger than the taper angle α of the rotating tool 200 as in the rotating tool 201 of FIG. 11B, the surface of the metal member 210 to be joined can be pressed as compared with the rotating 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.

  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.

  In addition, frictional heat can be reduced by performing friction stirring while cooling the base member 2 and the lid plate 5 with the table K functioning as a cooling plate. Thereby, the deformation of the heat transfer plate 1 due to the heat shrinkage can be reduced. Further, in the present embodiment, when viewed in a plan view, the cooling flow path and the butting portions J and J (moving trajectories of the rotary tool G for temporary bonding and the rotary tool F for full bonding) overlap each other. A portion where frictional heat is generated can be intensively cooled. Thereby, the cooling efficiency can be improved. In addition, since the cooling medium is circulated by disposing the cooling pipe WP, the management of the cooling medium becomes easy. Further, since the table K (cooling plate) is in surface contact with the back surface 2b of the base member 2, the cooling efficiency can be increased.

  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. 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. 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 lid plate insertion step, a temporary joining step, and a main joining step are performed.

  As shown in FIG. 12A, the preparation step is a step of preparing the base member 2.

  As shown in FIG. 12B, 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 butted portions J and J. In the temporary joining step, as in the first embodiment, a table K functioning as a cooling plate is arranged below the base member 2 and friction stir welding is performed while cooling the base member 2 and the cover plate 5.

  As shown in FIG. 13, the final joining step is a step of performing friction stir welding on the butted portions J, J using the final joining rotary tool F. As in the first embodiment, in the main joining step, a table K functioning as a cooling plate is arranged below the base member 2 to cool the base member 2 and the lid plate 5 while the temporary joining step is performed. Stir welding is performed. 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 abutting portions J and J in the depth direction.

  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. 13, when a gap Q is formed around the heat medium pipe 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. This fills the space Q around the heat medium tube 6 with the metal, so that the watertightness and airtightness can be further improved.

(Third embodiment)
Next, a third embodiment of the present invention will be described. The method for manufacturing a 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, and a main joining step are performed.

  As shown in FIG. 14A, 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. In the temporary joining step, as in the first embodiment, a table K functioning as a cooling plate is arranged below the base member 2 and the temporary joining is performed while cooling the base member 2 and the cover plate 5. In the temporary joining step, in the present embodiment, 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. 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. 14B, 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 final joining step, a table K functioning as a cooling plate is arranged below the base member 2 following the temporary joining step, and friction stir welding is performed while cooling the base member 2 and the cover plate 5. 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 addition, the moving route of the rotary tool F for joining is preferably along the arrangement position of the cooling pipe WP. That is, when viewed in a plan view, it is preferable that a part of the cooling pipe WP and the movement trajectory of the main joining rotary tool F in the main joining step substantially overlap.

  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. 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.

  In addition, frictional heat can be reduced by performing friction stirring while cooling the base member 2 and the lid plate 5 with the table K functioning as a cooling plate. Thereby, the deformation of the heat transfer plate 1B due to the heat shrinkage can be reduced. Further, in the present embodiment, when viewed in a plan view, the cooling path and the movement trajectory of the rotary tool F for the main joining in the main joining step overlap each other, so that a portion where frictional heat is generated is concentrated. Can be cooled. Thereby, the cooling efficiency can be improved. In addition, since the cooling medium is circulated by disposing the cooling pipe WP, the management of the cooling medium becomes easy. Further, since the table K (cooling plate) is in surface contact with the back surface 2b of the base member 2, the cooling efficiency can be increased.

  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. 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 main joining step of the present embodiment, the distal end pin F3 is set so as to be pushed into the position reaching the base member 2, but is set so as not to reach the base member 2, that is, the proximal end pin F3 is set. The insertion depth may be set so that both the F2 and the distal pin F3 are in contact with only the lid 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 main joining step of 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, and the overlapping portion J1 May be stirred by friction. In this case, a table K functioning as a cooling plate is arranged on the lid plate 5 and the main joining is performed while cooling the base member 2 and the lid plate 5. Even in such a case, the distal end side pin F3 may be pushed to a position where it contacts both the base member 2 and the cover plate 5, or it may be pushed to a position where it contacts only the base member 2, and the overlapping portion J1 is pushed. You may set so that friction stirring 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 recess closing step, a temporary joining step, and a main joining step.

  As shown in FIG. 15A, 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. 15A and FIG. 15B, in the temporary joining step and the main joining step, a table K functioning as a cooling plate is arranged below the base member 2 as in the third embodiment, and Temporary joining and main joining are performed while cooling the lid plate 5. Since the temporary joining step and the main joining step are the same as those in the third embodiment, 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 main joining step of 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, but is set so as not to reach the base member 2, that is, the proximal end pin F3. The overlapped portion J1 may be set so as to be frictionally stirred by pushing the F2 and the tip side pin F3 to a position where only the lid plate 5 comes into contact. 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 main joining step of 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, and the overlapping portion J1 May be stirred by friction. In this case, a table K functioning as a cooling plate is arranged on the lid plate 5 and the main joining is performed while cooling the base member 2 and the lid plate 5. Even in this case, the distal end side pin F3 may be pushed to a position where it contacts both the base member 2 and the cover plate 5, or may be pushed to a position where it contacts only the base member 2 and set to frictionally stir. May be.

(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, an overlapping step (overlapping section forming step), a temporary joining step, and a main joining step are performed.

  As shown in FIG. 16, the preparation step is a step of preparing metal members 31 and 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. In the temporary joining step, a table K functioning as a cooling plate is arranged below the metal member 31 and the temporary joining is performed while cooling the metal members 31 and 32. In the temporary joining step, in the present embodiment, the rotary tool G for temporary joining is inserted from the side surfaces of the metal members 31 and 32, and friction stir welding is performed on the overlapping portion J1. 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 final joining step, following the temporary joining step, a table K functioning as a cooling plate is arranged below the metal member 31 to perform friction stir welding while cooling the metal members 31 and 32. The tip pin F3 of the rotating rotary tool F for full joining is inserted from the surface 32a of the metal member 32, and the rotary tool F for full joining is relatively moved to frictionally stir weld the overlapped portion J1. 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, a state in which the proximal pin F2 is in contact with the metal member 32 and the distal pin F3 is in contact with both of the metal members 31 and 32 (the distal end of the distal pin F3 has entered the metal member 31). State) to perform friction stir welding. Thereby, the composite board 1D is formed. In addition, the moving route of the rotary tool F for joining is preferably along the arrangement position of the cooling pipe WP. That is, when viewed in a plan view, it is preferable that a part of the cooling pipe WP and the movement trajectory of the main joining rotary tool F in the main joining step substantially overlap.

  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.

  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. 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. 17, when performing the main bonding 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 frictional heat generated by the contact between the base-side pins F2 and the front-side pins F3 and the metal member 32, so that the overlapped portion J1 can be joined. Thereby, the composite board 1E is formed.

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 rotary tool for final bonding F2 proximal pin F3 distal pin G temporary bonding Rotating tool G2 Base end side pin G3 Tip side pin J Butt joint J1 Overlap part K Table (cooling plate)
WP Cooling pipe W, W1 Plasticized area

Claims (10)

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 tip side pin along a butted portion of a side wall of the lid groove and a side surface of the lid plate to perform frictional stirring,
The taper angle of the proximal pin of the rotating tool for full joining is greater 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, while cooling the base member and the cover plate with a cooling plate installed on the back side of the base member, insert the tip pin of the rotated main joining rotating tool into the butting portion. A method of producing a heat transfer plate, wherein friction stir is performed in a state where an outer peripheral surface of the base end pin is in contact with the base member and the lid 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 including a proximal pin and a distal pin along the abutting portion between the side wall of the lid groove and the side surface of the lid plate to perform frictional stirring,
The taper angle of the proximal pin of the rotating tool for full joining is greater 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, while cooling the base member and the cover plate with a cooling plate installed on the back side of the base member, insert the tip pin of the rotated main joining rotating tool into the butting portion. A method of producing a heat transfer plate, wherein friction stir is performed in a state where an outer peripheral surface of the base end pin is in contact with the base member and the lid 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. Main joining step of relative movement,
The taper angle of the proximal pin of the rotating tool for full joining is greater 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, while cooling the base member and the lid plate with a cooling plate installed on the back side of the base member, the tip pin of the rotated main joining rotating tool is rotated on the surface of the lid plate. While inserting the distal end pin into contact with both the base member and the lid plate, or the lid plate only while the outer peripheral surface of the proximal end pin is in contact with the surface of the lid plate. A method for producing a heat transfer plate, wherein friction stir of a polymerization section is performed. 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. Main joining step of relative movement,
The taper angle of the proximal pin of the rotating tool for full joining is greater 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, while cooling the base member and the cover plate with a cooling plate installed on the front surface side of the lid plate, the tip pin of the rotated main joining rotating tool is attached to the back surface of the base member. Inserting, while making the outer peripheral surface of the proximal end pin contact the back surface of the base member, the distal end pin is in contact with both the base member and the lid plate, or the base member only, A method for producing a heat transfer plate, wherein friction stir of a polymerization section is performed.   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, Including
The taper angle of the proximal pin of the rotating tool for full joining is greater 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, while cooling the one metal member and the other metal member with a cooling plate installed on the back side of the one metal member, the tip pin of the rotated main joining rotating tool is rotated. Inserting the distal end pin into both the one metal member and the other metal member while inserting the distal end pin into the surface of the other metal member and bringing the outer peripheral surface of the proximal end pin into contact with the surface of the other metal member. Alternatively, friction stir welding of the overlapped portion is performed in a state of being brought into contact with 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.

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