JP2019162660A - Manufacturing method of heat transfer plate and friction stir welding method - Google Patents

Abstract

To provide a manufacturing method of a heat transfer plate capable of minimizing recessed grooves on the surface of a metal member and capable of minimizing joint surface roughness.SOLUTION: A taper angle of a base end side pin F2 is set to be larger than a taper angle of a tip side pin F3, a stepwise step difference part is formed on an outer circumferential surface of the base end side pin F2, the tip side pin F3 of a rotated rotary tool F for the principal joining is inserted to an abutment part J in the principal joining process and, while the outer circumferential surface of the base end side pin F2 is brought into contact with a surface 2a of a base member 2 and a surface 5a of a cover plate 5, friction stir is performed.SELECTED DRAWING: Figure 9B

Description

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

  As a rotary tool used for friction stir welding, a tool including a shoulder portion and a stirring pin hanging from the shoulder portion is known. The rotary tool performs friction stir welding in a state where the lower end surface of the shoulder portion is pushed into the metal member. By pushing the shoulder portion into the metal member, the plastic fluidizing material can be pressed to suppress the generation of burrs. However, there is a problem that if the height position of the joint is changed, defects are likely to occur, the stepped groove becomes large and a lot of burrs are generated.

  On the other hand, it is a friction stir welding method for joining two metal members using a rotary tool equipped with a stirring pin, and the rotating stirring pin is inserted into the abutting portion between the metal members, and only the stirring pin contacts the metal member There is known a friction stir welding method including a main joining step of performing friction stir welding in a state of being made (Patent Document 1). According to the prior art, a spiral groove is engraved on the outer peripheral surface of the stirring pin, and in order to perform friction stir welding with the base end exposed while only the stirring pin is in contact with the member to be joined, 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 fluid material 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 bonding surface roughness becomes large. Further, there is a problem that a bulging portion (a portion where the surface of the metal member swells compared to before joining) is formed on the side of the step groove.

  On the other hand, Patent Document 2 describes a rotary tool including a shoulder portion and a stirring pin that hangs down from the shoulder portion. Tapered surfaces are formed on the outer peripheral surfaces of the shoulder portion and the stirring pin, respectively. A spiral groove in 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, the metal member can be stably joined even if the thickness of the metal member and the height position of the joining change. In addition, when the plastic fluidized material enters the groove, the flow of the plastic fluidized material can be controlled to form a suitable plasticized region.

JP 2013-39613 A Japanese Patent No. 4210148

  However, in the prior art of Patent Document 2, since the plastic fluid material enters the groove of the tapered surface, there is a problem that the groove does not function. Further, when the plastic fluid material enters the groove, the plastic fluid material is frictionally agitated with the plastic fluid material adhering to the groove, so that there is a problem that the welded metal member and the deposits rub against each other to deteriorate the joining quality. Furthermore, there are problems that the surface of the metal member to be joined becomes rough, burrs increase, and the stepped grooves on the surface of the metal member also increase.

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

  In order to solve such a problem, the present invention includes a lid plate insertion step of inserting a lid plate into a lid groove formed around a concave groove opened on the surface of the base member, a side wall of the lid groove, And a main joining step in which frictional stirring is performed by relatively moving a rotary tool having a base end side pin and a front end side pin along the abutting portion with the side surface of the cover plate, and the taper angle of the base end side pin is The taper angle of the distal end side pin is larger, a stepped step portion is formed on the outer peripheral surface of the proximal end side pin, and the distal end side pin of the rotating tool rotated in the main joining step Is inserted into the abutting portion, and friction stirring is performed in a state where the outer peripheral surface of the base end side pin is in contact with the surface of the base member and the cover plate.

  Further, the present invention provides a heat medium tube insertion step of inserting a heat medium tube into a concave groove formed in a bottom surface of a cover groove that opens on the surface of the base member, and a lid for inserting a cover plate into the cover groove. A plate insertion step, and a main joining step in which frictional stirring is performed by relatively moving a rotary tool provided with 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. A taper angle of the proximal end pin is larger than a taper angle of the distal end side pin, and a stepped step portion is formed on an outer peripheral surface of the proximal end pin. In the step, the tip end side pin of the rotated rotating tool is inserted into the abutting portion, and the friction stirring is performed in a state where the outer peripheral surface of the base end side pin is in contact with the surface of the base member and the lid plate. Features.

  The present invention also includes a closing step of overlaying a cover plate on the surface of the base member so as to cover the recessed groove or recess opening on the surface of the base member, and a proximal-side pin and a distal-side pin from the surface of the cover plate. And a main joining step of relatively moving the rotary tool along the overlapping portion of the surface of the base member and the back surface of the lid plate, and the taper angle of the proximal end pin is , The taper angle of the distal end side pin is larger, a stepped step portion is formed on the outer peripheral surface of the proximal end pin, and the outer peripheral surface of the proximal end pin is formed in the main joining step. In the state where the tip side pin is brought into contact with both the base member and the lid plate, or only the lid plate, the superposed portion is subjected to friction stirring while contacting the surface of the lid plate. To do.

  Further, the present invention provides a closing step of overlaying a cover plate on the surface of the base member so as to cover a concave groove or a recess opened on the surface of the base member, and a proximal-side pin and a distal-side pin from the back surface of the base member. And a main joining step of relatively moving the rotary tool along the overlapping portion of the surface of the base member and the back surface of the lid plate, and the taper angle of the proximal end pin is , The taper angle of the distal end side pin is larger, a stepped step portion is formed on the outer peripheral surface of the proximal end pin, and the outer peripheral surface of the proximal end pin is formed in the main joining step. In the state where the tip side pin is brought into contact with both the base member and the cover plate, or only the base member, the superposed portion is subjected to friction stirring while contacting the back surface of the base member. To do.

  Further, the present invention is a friction stir welding method for joining two metal members using a rotary tool having a proximal side pin and a distal side pin, wherein the taper angle of the proximal side pin is the distal side pin. A stepped step portion is formed on the outer peripheral surface of the base end side pin, and the surface of one of the metal members and the back surface of the other metal member are overlapped with each other. A superposed part forming step of forming a superposed part, and inserting a tip side pin of the rotating tool rotated from the surface of the other metal member, and placing an outer peripheral surface of the base side pin on the surface of the other metal member A main joining step of performing frictional stirring of the overlapping portion in a state where the tip side pin is in contact with both the one metal member and the other metal member, or only the other metal member, The other metal part Wherein the hardness than the one of the metal member is set lower.

  According to this method, since the base member and the cover plate or the metal member can be pressed on the outer peripheral surface of the base end side pin having a large taper angle, the step groove on the joining surface can be reduced and the step groove is formed. It is possible to eliminate or reduce the bulge formed on the side of the. Since the stepped step portion is shallow and the outlet is wide, even if the metal member is pressed by the base end side pin, the plastic fluidized material hardly adheres to the outer peripheral surface of the base end side pin. For this reason, the bonding surface roughness can be reduced, and the bonding quality can be suitably stabilized. Moreover, it can insert easily to a deep position by providing a front end side pin.

  Moreover, it is preferable to include the temporary joining process of temporarily joining the said butt | matching part before the said main joining process. Moreover, it is preferable to include the temporary joining process of temporarily joining the said superposition | polymerization part before the said main joining process. According to this manufacturing method, it is possible to prevent the opening of the butted portion or the overlapped portion during the main joining step.

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

  According to the heat transfer plate manufacturing method and the friction stir welding method according to the present invention, the stepped grooves on the surface of the metal member can be reduced, and the bonding surface roughness can be reduced.

It is a side view which shows the rotary 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 this rotation tool for 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 this rotation tool for joining. It is a perspective view which shows the heat exchanger plate which concerns on 1st embodiment of this invention. It is sectional drawing which shows the preparatory process of the manufacturing method of the heat exchanger plate which concerns on 1st embodiment. It is sectional drawing which shows the cover plate insertion process of the manufacturing method of the heat exchanger plate which concerns on 1st embodiment. It is a top view which shows the tab material arrangement | positioning process of the manufacturing method of the heat exchanger plate which concerns on 1st embodiment. It is sectional drawing which shows the manufacturing method of the heat exchanger plate which concerns on 1st embodiment, Comprising: A temporary joining process is shown. It is sectional drawing which shows the manufacturing method of the heat exchanger plate which concerns on 1st embodiment, Comprising: This joining process is shown. It is a conceptual diagram which shows the conventional rotation tool. It is a conceptual diagram which shows the conventional rotation tool. It is sectional drawing which shows the manufacturing method of the heat exchanger plate which concerns on 2nd embodiment of this invention, Comprising: A preparatory process is shown. It is sectional drawing which shows the manufacturing method of the heat exchanger plate which concerns on 2nd embodiment of this invention, Comprising: A cover plate insertion process is shown. It is sectional drawing which shows this joining process which concerns on 2nd embodiment. It is sectional drawing which shows the manufacturing method of the heat exchanger plate which concerns on 3rd embodiment of this invention, Comprising: A temporary joining process is shown. It is sectional drawing which shows the manufacturing method of the heat exchanger plate which concerns on 3rd embodiment, Comprising: This joining process is shown. It is sectional drawing which shows the manufacturing method of the heat exchanger plate which concerns on 4th embodiment of this invention, Comprising: A temporary joining process is shown. It is sectional drawing which shows the manufacturing method of the heat exchanger plate which concerns on 4th embodiment of this invention, Comprising: This joining process is shown. It is sectional drawing which shows the friction stir welding method which concerns on 5th embodiment of this invention. It is sectional drawing which shows the modification of 5th embodiment.

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

  The base end side pin F2 is continuous with the base shaft portion F1 and tapers toward the tip. The proximal end pin F2 has a truncated cone shape. The taper angle A of the base end 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 exceeds 160 °, the joint surface roughness after frictional stirring becomes large. The taper angle A is larger than the taper angle B of the distal end side pin F3 described later. As shown in FIG. 2, a stepped step portion F21 is formed over the entire height direction on the outer peripheral surface of the proximal end side pin F2. The step portion F21 is formed in a spiral shape clockwise or counterclockwise. That is, the stepped portion F21 has a spiral shape in plan view and a step shape in side view. In the present embodiment, the stepped portion F21 is set counterclockwise from the proximal end side toward the distal end side in order to rotate the main welding rotary tool F to the right.

  In addition, when rotating this welding rotation tool F counterclockwise, it is preferable to set the stepped portion F21 clockwise from the base end side to the tip end side. Thereby, since the plastic fluidized material is guided to the front end side by the step portion F21, 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. A distance X1 (horizontal direction distance) between the vertices F21c and F21c of the adjacent stepped portions F21 is appropriately set according to a step angle C and a height Y1 of the step side surface F21b described later.

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

  The step angle C formed by the step bottom surface F21a and the step side surface F21b may be set as appropriate, and is set at 85 to 120 °, for example. In this 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 circumferential direction (minus is downward with respect to the horizontal plane, and plus is with respect to the horizontal plane). Top). 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 fluidized material stays inside the stepped portion F21 and does not adhere to the outside when performing friction stirring. It sets suitably so that it may come out and a joint surface roughness can be made small by pressing a plastic fluid material in level difference bottom F21a.

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

  In addition, when rotating this welding rotation tool F counterclockwise, it is preferable to set the spiral groove F31 clockwise from the proximal end side toward the distal end side. Thereby, since the plastic fluid material is guided to the front end side by the spiral groove F31, 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. A distance (horizontal direction distance) between vertices F31c and F31c of adjacent spiral grooves F31 is defined as a length X2. The height of the spiral side surface F31b is defined as a 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 function of increasing the frictional heat by coming into contact with the metal member to be joined and guiding the plastic fluid material to the tip side.

  The design of the joining rotary tool F can be changed as appropriate. FIG. 3 is a side view showing a first modification of the rotary tool of the present invention. As shown in FIG. 3, in the main rotating 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 within a range in which the plastic fluidized material stays in the stepped portion F21 during frictional stirring and comes out to the outside.

  FIG. 4 is a side view showing a second modification of the welding rotary tool of the present invention. As shown in FIG. 4, in the main welding rotary tool FB according to the second modification, the step angle C of the step portion F <b> 21 is 115 °. The step bottom surface F21a is parallel to the horizontal plane. In this manner, the step bottom surface F21a is 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 rotating tool for bonding according to the present invention. As shown in FIG. 5, in the main welding 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 surface. 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 periphery in a range in which the plastic fluid material can be pressed during the friction stirring. Also according to the first to third modified examples of the main rotating tool for joining described above, an effect equivalent to that of the following embodiment can be obtained.

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

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

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

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

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

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

  As shown in FIG. 7A, the preparation process is a process of preparing the base member 2. First, the base member 2 is fixed to the gantry K via a clamp (not shown). Then, the concave groove 3 and the cover groove 4 are formed by cutting using an end mill or the like. In addition, you may use the base member 2 in which the ditch | groove 3 and the cover groove | channel 4 were formed previously by die-casting or extrusion molding.

  As shown in FIG. 7B, the cover plate insertion 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 are abutted to form the abutting portions J and J. The surface 5a of the cover plate 5 and the surface 2a of the base member 2 are flush with each other.

  As shown in FIG. 8, the tab material arranging step is a step of arranging the tab materials 10, 10 on the side surface of the base member 2. The tab material 10 is a member that sets a start position and an end position of friction stirring described later. The tab member 10 is in surface contact with the opposing side surfaces of the base member 2 and is disposed on the extension line of the butted portions J and J. In this embodiment, the tab material 10 is formed of an aluminum alloy that is the same material as the base member 2. The tab material 10 is joined by welding the corners between the tab material 10 and the base member 2.

  As shown to FIG. 9A, a temporary joining process is a process of performing friction stir welding preliminarily with respect to the butt | matching parts J and J using the rotary tool G for temporary joining. The temporary joining rotary tool G includes a shoulder portion G1 and a stirring pin G2 that hangs down from the shoulder portion G1. The start position and the end position of the temporary joining step are not particularly limited as long as they are on the surface of the base member 2 and the tab material 10, but are set on the surface of the tab material 10 in this embodiment.

  Specifically, the starting position of the temporary joining step is set on the surface of one of the tab members 10, and the friction stir welding is performed on the entire length of the one butted portion J. A plasticized region W1 is formed in the movement locus of the temporary joining rotary tool G. When 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 the friction stir welding is performed on the entire length of the other butted portion J. When the temporary joining rotary tool G is moved to the one tab member 10, the temporary joining rotary tool G is detached from the tab member 10.

  As shown in FIG. 9B, the main joining step is a step of performing friction stir welding on the butt joints J and J using the main welding rotating tool F. It is preferable to set the start position and the end position of the main joining process on the surface of the tab material 10. When inserting the main joining rotary tool F into the tab member 10, the punch hole of the temporary joining rotary tool G may be used, or a separate pilot hole may be provided in the tab member 10, and You may insert the rotation tool F for joining.

  In the main joining step, the friction stir welding is performed in a state where the proximal end side pin F2 and the distal end side pin F3 are in contact with the base member 2 and the cover plate 5. Friction stir welding is performed while pressing the surface 2a of the base member 2 and the surface 5a of the cover plate 5 with the outer peripheral surface of the base end side pin F2 while inserting the front end side pin F3 of the rotating tool F for main joining to be rotated into the abutting portion J. I do. The main rotating tool for welding F is relatively moved along the abutting portion J. The insertion depth of the proximal end side pin F2 and the distal end side pin F3 may be set as appropriate as long as the outer peripheral surface of the proximal end side pin F2 can press the surface 2a of the base member 2 and the surface 5a of the cover plate 5. Good. For example, the insertion depth of the base end side pin F2 and the front end side pin F3 is a range in which the outer peripheral surface of the base end side pin F2 can press the surface 2a of the base member 2 and the surface 5a of the cover plate 5, And you may set so that the front end side pin F3 may reach the cover groove | channel 4. FIG. In the present embodiment, it is set so that the central portion in the height direction of the outer peripheral surface of the base end side pin F2 is in contact with the surface 2a of the base member 2 and the surface 5a of the lid plate 5. A plasticized region W is formed in the movement trajectory of the main rotating tool for welding F. When the main joining process is completed, the tab material 10 is cut off from the base member 2.

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

  Here, for example, as shown in FIG. 10A, in the case of the conventional rotary tool 200, the shoulder portion does not hold the surface of the metal member 210 to be bonded, so that the step groove (the surface of the metal member to be bonded and the plasticized region) There is a problem that the concave groove formed with the surface becomes large and the bonding surface roughness becomes large. Further, there is a problem that a bulging portion (a portion where the surface of the bonded metal member swells compared to before joining) is formed on the side of the step groove. On the other hand, when the taper angle β of the rotary tool 201 is larger than the taper angle α of the rotary tool 200 as in the rotary tool 201 of FIG. 10B, the surface of the metal member 210 to be bonded can be pressed compared to the rotary tool 200. For this reason, the step groove is reduced and the bulging portion is also reduced. However, since the downward plastic flow becomes strong, a kissing bond is likely to be formed below the plasticized region.

  On the other hand, the main rotating tool F for joining according to the present embodiment includes a base end side pin F2 and a front end side pin F3 having a taper angle smaller than the taper angle A of the base end side pin F2. . Thereby, it becomes easy to insert the main welding rotating tool F into the butt J. Further, since the taper angle B of the distal end side pin F3 is small, the main joining rotary tool F can be easily inserted up to a deep position of the butting portion J. Further, since the taper angle B of the distal end side pin F3 is small, downward plastic flow can be suppressed as compared with the rotary 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, even if the thickness of a to-be-joined metal member and the height position of joining change compared with the conventional rotary tool, it can join stably.

  In addition, since the plastic fluid can be pressed by the outer peripheral surface of the base end side pin F2, the stepped groove formed on the joining surface can be reduced, and the bulge formed on the side of the stepped groove. Can be eliminated or reduced. Further, since the stepped step portion F21 is shallow and has a wide outlet, the plastic fluid material can easily come out of the step portion F21 while pressing the plastic fluid material with the step bottom surface F21a. Therefore, even if the plastic fluid material is pressed by the proximal pin F2, the plastic fluid material is difficult to adhere to the outer peripheral surface of the proximal pin F2. Therefore, the bonding surface roughness can be reduced and the bonding quality can be suitably stabilized.

  In the main joining process, it is not always necessary to perform frictional stirring over the entire length in the depth direction of the butted portions J, J. However, if friction stirring is performed over the entire length of the butted portion J, the heat transfer plate 1 watertightness and airtightness can be enhanced.

  Moreover, the opening of the base member 2 and the cover plate 5 can be prevented by performing the temporary bonding step when performing the main bonding step. Further, in the temporary joining process and the main joining process, the rotary tool G for temporary joining and the rotational tool F for main joining are not detached from the base member 2 in the middle of friction stirring, and each rotary tool can be moved in the manner of one stroke. Therefore, it is possible to reduce labor.

  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 intermittently formed. In the temporary joining step, the butt portions J and J may be joined by welding. Moreover, you may temporarily join the tab material 10 and the base member 2 using the rotation tool G for temporary joining.

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

  In the heat transfer plate manufacturing method 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. 11A, the preparation process is a process of preparing the base member 2.

  As shown in FIG. 11B, the heat medium pipe insertion step is a step of inserting the heat medium pipe 6 into the groove 3. The size and the like of the groove 3 and the heat medium pipe 6 may be set as appropriate, but in this embodiment, the outer diameter of the heat medium pipe 6 and the width and depth of the groove 3 are substantially equal. Yes.

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

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

  As shown in FIG. 12, the main joining step is a step of performing friction stir welding on the abutting portions J and J using the main welding rotating tool F. This joining process is performed in the same manner as the first embodiment. Plasticizing regions W and W are formed on the movement trajectory of the main rotating tool F for welding. The plasticized region W is formed over the entire length in the depth direction of the butted portions J and J.

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

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

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

  In addition, as shown in FIG. 12, when the gap Q is formed around the heat medium pipe 6, the gap Q may be filled by the main joining step. When the cover plate 5 is inserted into the cover groove 4 in the cover plate insertion step, a gap Q is formed by the concave groove 3, the lower surface of the cover plate 5, and the heat medium pipe 6. While the positions of the butted portions J and J are brought close to the heat medium pipe 6, the plastic fluidized material formed by the main welding rotary tool F is caused to flow into the gap Q in the main joining step. Thereby, since the space | gap part Q around the pipe | tube 6 for heat media is filled with a metal, watertightness and airtightness can be improved more.

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

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

  As shown in FIG. 13A, the preparation process is a process 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 (blocking step) is a step of placing the cover plate 5 on the surface 2 a of the base member 2 and covering the upper portion of the groove 3. In the concave groove closing step, the front surface 2a of the base member 2 and the back surface 5b of the cover plate 5 are overlapped to form the overlapping portion J1.

  The temporary bonding step is a step of performing preliminary bonding to the overlapping portion J1. In the present embodiment, in the present embodiment, the temporary bonding 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. 13B, the main joining step is a step of performing friction stir welding with respect to the overlapping portion J1 by using the main joining rotating tool F. The front end side pin F3 of the rotating tool F for main joining to be rotated is inserted from the surface 5a of the cover plate 5, and the main welding rotating tool F is relatively moved along the longitudinal direction of the concave groove 3 to rub the overlapping portion J1. Stir welding. The movement route of the main rotating tool F is set so that the plastic fluid does not flow into the 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 proximal end side pin F2. In the main joining step, friction stir welding is performed in a state where the distal end side pin F3 is in contact with both the base member 2 and the cover plate 5 while the outer peripheral surface of the base end side pin F2 is in contact with the surface 5a of the cover plate 5. . The insertion depth of the base end side pin F2 and the front end side pin F3 may be set as appropriate as long as the outer peripheral surface of the base end side pin F2 can press the surface 5a of the cover plate 5. In this embodiment, it sets so that the front end side pin F3 may contact the base member 2 while making the center part of the height direction of the outer peripheral surface of the base end side pin F2 contact the surface 5a of the cover plate 5. FIG. Even if it does in this way, the effect substantially equivalent to 1st embodiment can be acquired.

  Even if the cover plate 5 having a large plate thickness is placed on the surface 2a of the base member 2 without providing the cover groove 4 as in the method of manufacturing the heat transfer plate according to the third embodiment, the heat transfer plate 1B can be easily manufactured. Moreover, the opening of the base member 2 and the cover plate 5 can be prevented by performing the temporary bonding step 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 intermittently formed. Further, in the temporary joining step, the overlapped portion J1 may be joined by welding. Moreover, you may perform a temporary joining process and a main joining process using a tab material like 1st embodiment.

  Further, in the present embodiment, the distal end side pin F3 is set so that the distal end of the distal end side pin F3 is pushed to reach the base member 2, but is set not to reach the base member 2, that is, the outer peripheral surface of the proximal end side pin F2. The insertion depth may be set so that both the proximal end side pin F2 and the distal end side pin F3 are in contact with only the lid plate 5 while contacting the surface 5a of the lid plate 5. In such a case, the overlapping portion J1 is joined by plastic fluidization of the overlapping portion J1 by the frictional heat generated by the contact between the base end side pin F2 and the distal end side pin F3 and the cover plate 5.

  In the present embodiment, the main welding rotary tool F is inserted from the front surface 5a of the cover plate 5, but the main welding rotary tool F is inserted from the back surface 2b of the base member 2 to friction stir the overlapping portion J1. You may do it. Even in such a case, the distal end side pin F3 is pushed to a position where it comes into contact with both the base member 2 and the cover plate 5 while the outer peripheral surface of the proximal end side pin F2 is in contact with the back surface 2b of the base member 2. Alternatively, it may be set so that the overlapping portion J1 is frictionally stirred by being pushed into a position where only the base member 2 comes into contact.

[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 is different from the third embodiment in that a recess 20 having a large depression is formed.

  The manufacturing method of the heat exchanger plate which concerns on 4th embodiment performs a preparatory process, a recessed part obstruction | occlusion process, a temporary joining process, and a main joining process.

  As shown in FIG. 14A, the preparation process is a process 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 process (blocking process) is a process of placing the cover plate 5 on the surface 2 a of the base member 2 and covering the top of the recess 20. In the recess closing process, the front surface 2a of the base member 2 and the back surface 5b of the cover plate 5 are overlapped to form the overlapping portion J1. As shown in FIG. 14B, the temporary joining step and the main joining step are the same as those in the third embodiment, and thus detailed description thereof is omitted. Thereby, the heat transfer plate 1C is formed.

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

  In the present embodiment, the distal end side of the distal end side pin F3 is set so as to be pushed to the position where it reaches the base member 2, but is set not to reach the base member 2, that is, the outer peripheral surface of the proximal end side pin F2. May be set so that the base portion side pin F2 and the distal end side pin F3 and only the cover plate 5 are in contact with each other while contacting the surface 5a of the cover plate 5 to friction stir the overlapping portion J1. In such a case, the base member 2 and the cover plate 5 are plastically fluidized by the frictional heat generated by the contact between the base end side pin F2 and the distal end side pin F3 and the cover plate 5, whereby the overlapping portion J1 is formed. Be joined.

  In the present embodiment, the main welding rotary tool F is inserted from the front surface 5a of the cover plate 5, but the main welding rotary tool F is inserted from the back surface 2b of the base member 2 to friction stir the overlapping portion J1. You may do it. Even in this case, the distal end side pin F3 may be pushed to a position where it comes into contact with both the base member 2 and the cover plate 5 while the outer peripheral surface of the proximal end side pin F2 is in contact with the back surface 2b of the base member 2. However, it may be set so that it is pushed into a position where only the base member 2 is brought into contact with and is frictionally stirred.

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

  In the friction stir welding method according to the fifth embodiment, a preparation process, an overlaying process (overlapping part forming process), a temporary bonding process, and a main bonding process are performed.

  As shown in FIG. 15, 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 types of the metal members 31 and 32 may be appropriately selected from metals that can be frictionally stirred. For example, the material type of the metal member 32 into which the main rotating tool F is inserted may be a material type having a hardness lower than that of the metal member 31.

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

  The temporary bonding step is a step of performing preliminary bonding to the overlapping portion J1. In the present embodiment, in the present embodiment, the temporary bonding rotary tool G is inserted from the side surfaces of the metal members 31 and 32, and the 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 metal members 31 and 32.

  The main joining step is a step of performing friction stir welding on the overlapping portion J1 by using the main welding rotating tool F. In the present embodiment, the main joining rotary tool F is inserted vertically from the surface 32 a of the metal member 32, and the tip of the tip side pin F <b> 3 is set to enter the metal member 31. The main joining step is a step of performing friction stir welding on the overlapping portion J1 by using the main welding rotating tool F. The leading end side pin F3 of the rotating main joining rotary tool F is inserted from the surface 32a of the metal member 32, and the main joining rotating tool F is relatively moved to friction stir weld the superposed 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 proximal end side pin F2. In the main joining step, the friction stir welding is performed in a state where the distal end side pin F3 is in contact with both the metal members 31 and 32 while the outer peripheral surface of the proximal end side pin F2 is in contact with the surface 32a of the metal member 32. Thereby, the composite plate 1D is formed.

  According to the friction stir welding method according to the fifth embodiment, the composite plate 1D having no flow path inside is easily formed. Also by the friction stir welding method according to the fifth embodiment, substantially the same effect as that of the third embodiment can be obtained.

  Moreover, the opening between the metal members 31 and 32 can be prevented by performing the temporary bonding step 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 intermittently formed. Further, in the temporary joining step, the overlapped portion J1 may be joined by welding. Moreover, you may perform a temporary joining process and a main joining process using a tab material like 1st embodiment.

  In addition, as shown in FIG. 16, when performing the main joining step, the distal end side pin F3 is prevented from reaching the metal member 31, that is, the outer peripheral surface of the proximal end side pin F2 is made the surface 32a of the metal member 32. Friction stirring may be performed by setting the proximal end side pin F2 and the distal end side pin F3 so as to contact only the metal member 32 while making contact. In such a case, the metal members 31 and 32 can be joined together by bringing the plasticized region W and the overlapping portion J1 into contact with each other. That is, the overlapping portions J1 can be joined by plastically fluidizing the metal members 31 and 32 by 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. Thereby, the composite plate 1E is formed.

DESCRIPTION OF SYMBOLS 1 Heat transfer plate 2 Base member 3 Concave groove 4 Cover groove 5 Cover plate 6 Heat medium pipe 10 Tab material 20 Concave part 31 Metal member 32 Metal member F Rotating tool for main joining (rotating tool)
F2 Base end side pin F3 Front end side pin G Rotary tool for temporary joining J Butt part J1 Superposition part W Plasticization region

Claims (10)

A lid plate insertion step of inserting a lid plate into the lid groove formed around the concave groove opening on the surface of the base member;
A main joining step in which a frictional stirring is performed by relatively moving a rotary tool having a proximal-side pin and a distal-side pin along the abutting portion between the side wall of the lid groove and the side surface of the lid plate,
The taper angle of the proximal pin is larger than the taper angle of the distal pin,
A stepped step portion is formed on the outer peripheral surface of the base end side pin,
In the main joining step, the tip side pin of the rotated rotating tool is inserted into the abutting portion, and friction stirring is performed in a state where the outer peripheral surface of the base side pin is in contact with the surface of the base member and the lid plate. The manufacturing method of the heat exchanger plate characterized by performing. A heat medium tube insertion step of inserting the heat medium tube into the groove formed in the bottom surface of the lid groove opened on the surface of the base member;
A lid plate insertion step of inserting a lid plate into the lid groove;
A main joining step in which a frictional stirring is performed by relatively moving a rotary tool having a proximal-side pin and a distal-side pin along the abutting portion between the side wall of the lid groove and the side surface of the lid plate,
The taper angle of the base end side pin is larger than the taper angle of the tip end side pin, and a stepped step portion is formed on the outer peripheral surface of the base end side pin,
In the main joining step, the tip side pin of the rotated rotating tool is inserted into the abutting portion, and friction stirring is performed in a state where the outer peripheral surface of the base side pin is in contact with the surface of the base member and the lid plate. The manufacturing method of the heat exchanger plate characterized by performing.   The method for manufacturing a heat transfer plate according to claim 1, further comprising a temporary bonding step of temporarily bonding the butt portion before the main bonding step. A closing step of overlaying a cover plate on the surface of the base member so as to cover the recessed groove or recess opening on the surface of the base member;
A main joining step of inserting a rotary tool having a proximal pin and a distal pin from the surface of the lid plate and relatively moving the rotary tool along the overlapping portion of the surface of the base member and the back surface of the lid plate. And including
The taper angle of the proximal pin is larger than the taper angle of the distal pin,
A stepped step portion is formed on the outer peripheral surface of the base end side pin,
In the main joining step, the distal end side pin is brought into contact with both the base member and the lid plate or only the lid plate while the outer peripheral surface of the base end side pin is brought into contact with the surface of the lid plate. A method for producing a heat transfer plate, wherein the superposition part is frictionally stirred in a state. A closing step of overlaying a cover plate on the surface of the base member so as to cover the recessed groove or recess opening on the surface of the base member;
A main joining step of inserting a rotating tool having a proximal end pin and a distal end side pin from the back surface of the base member, and relatively moving the rotating tool along the overlapping portion of the surface of the base member and the back surface of the lid plate. And including
The taper angle of the proximal pin is larger than the taper angle of the distal pin,
A stepped step portion is formed on the outer peripheral surface of the base end side pin,
In the main joining step, the distal end side pin is brought into contact with both the base member and the cover plate, or only the base member while the outer peripheral surface of the proximal end side pin is brought into contact with the back surface of the base member. A method for producing a heat transfer plate, wherein the superposition part is frictionally stirred in a state.   The method for manufacturing a heat transfer plate according to claim 4, further comprising a temporary bonding step of temporarily bonding the overlapped portion before the main bonding step.   The heat transfer plate according to any one of claims 1 to 6, further comprising a burr cutting step of cutting a burr generated by friction stirring of the rotary tool after the main joining step. Production method. A friction stir welding method for joining two metal members using a rotary tool having a proximal pin and a distal pin,
The taper angle of the proximal pin is larger than the taper angle of the distal pin,
A stepped step portion is formed on the outer peripheral surface of the base end side pin,
A superposition part forming step of superposing the front surface of one metal member and the back surface of the other metal member to form a superposition part;
Inserting the tip side pin of the rotating tool rotated from the surface of the other metal member, bringing the outer peripheral surface of the base side pin into contact with the surface of the other metal member, Including a metal member and the other metal member, or a main joining step of performing frictional stirring of the overlapped portion in a state of being in contact with only the other metal member,
2. The friction stir welding method according to claim 1, wherein the other metal member is set to have a hardness lower than that of the one metal member.   The friction stir welding method according to claim 8, further comprising a temporary bonding step of temporarily bonding the overlapped portion before the main bonding step.   10. The friction stir welding method according to claim 8, further comprising a burr cutting step of cutting a burr generated by friction stirring of the rotary tool after the main joining step.

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