JP2015104750A - Production method of heat transfer plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a production method of a heat transfer plate where a flat heat transfer plate can be produced, the operability of a rotary tool is excellent and the degree of freedom of design is high.SOLUTION: A production method of a heat transfer plate comprises: a deformation step to deform a front side to be projected by acting tensile stress to the front side of a base member 2 and a lid plate 3; a lid groove closing step to insert the lid plate 3 into a lid groove 11 formed around a recess groove 10 opening at the front surface of the base member 2; and an actual junction step to perform friction agitation to relatively move a rotary tool F with an agitation pin F2 along a butted part J1 between the side wall of the lid groove 11 and the side surface of the lid plate 3. In the actual junction step, the friction agitation is performed in states that a rotating agitation pin F2 is inserted into the butted part J1 and only the agitation pin F2 is brought into contact with the base member 2 and the lid plate 3.

Description

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

  Friction stir welding (FSW = Friction Stir Welding) is known as a method for joining a pair of metal members. In friction stir welding, the rotated rotating tool is moved along the abutting portion between the metal members, and the metal at the abutting portion is plastically flowed by the frictional heat between the rotating tool and the metal member, so that the metal members are solid-phased. It is what is joined. In general, the rotating tool is formed by projecting a stirring pin (probe) on the lower end surface of a cylindrical shoulder.

  For example, Patent Document 1 describes an invention in which a base member and a lid plate are joined by friction stirring to form a heat transfer plate. As shown in FIG. 17A, the base member 101 has a lid groove 102 and a concave groove 103 formed on the bottom surface of the lid groove 102. The lid plate 110 is disposed in the lid groove 102 so as to cover the concave groove 103. In the invention according to Patent Document 1, friction stir welding is performed by moving the rotating tool G that rotates along the abutting portion between the lid groove 102 and the lid plate 110. The rotary tool G includes a shoulder G1 and a stirring pin G2 formed on the lower end surface of the shoulder G1. A plasticized region W is formed in the movement locus of the rotary tool G.

  When friction stir welding is performed as described above, the surface 101A of the base member 101 is warped so as to be concave due to thermal contraction. Therefore, in the invention according to Patent Document 1, as shown in FIG. 17B, a technique of performing frictional stirring with the rotary tool G on the back surface 101 </ b> B of the base member 101 is disclosed. When such a process is performed, heat shrinkage also occurs on the back surface 101B, so that the flatness of the heat transfer plate can be improved.

JP 2009-195940 A

  As shown in FIG. 17A, in the invention according to Patent Document 1, the lower end surface of the shoulder G1 is pushed into the surface 101A of the base member 101 to perform friction stir welding. When the shoulder G1 is pushed in, the plastic fluidized metal can be prevented from overflowing from the periphery of the rotary tool G. However, since a large pressing force acts on the base member 101 by the lower end surface of the shoulder G <b> 1, the plastic fluid material may flow into the concave groove 103. On the other hand, if the friction stir position is set so that the plastic fluid does not flow into the concave groove 103, there is a problem that the degree of freedom in designing the heat transfer plate is limited.

  Further, as shown in FIG. 17B, for example, when the rotary tool G is moved in the E1 direction with respect to the back surface 101B, the base member 101 is warped so as to be convex on the back surface 101B. Therefore, the front side in the traveling direction of the lower end surface of the shoulder G1 contacts the back surface 101B. Further, when the rotary tool is moved in the E2 direction, the rear side in the traveling direction of the lower end surface of the shoulder G1 comes into contact with the back surface 101B. Thereby, there exists a problem that the operativity of the rotation tool G falls.

  Accordingly, an object of the present invention is to provide a method for manufacturing a heat transfer plate that can manufacture a flat heat transfer plate, has good operability of the rotary tool, and has a high degree of design freedom. To do.

  In order to solve the above-mentioned problem, the present invention includes a deformation step in which a tensile stress is applied to the surface side of the base member and the lid plate, and the base member and the lid plate are deformed so that the surface side is convex, A lid groove closing step of inserting the lid plate into a lid groove formed around a concave groove opened on the surface of the base member, and along the abutting portion between the side wall of the lid groove and the side surface of the lid plate And a main joining step in which frictional stirring is performed by relatively moving a rotating tool provided with a stirring pin. In the main joining step, the rotated stirring pin is inserted into the abutting portion, and only the stirring pin is inserted into the base. Friction stirring is performed in a state where the member and the lid plate are in contact with each other.

  Further, the present invention provides a deformation step of deforming the base member and the lid plate so that the surface side is convex by applying a tensile stress to the surface side of the base member and the lid plate, and the surface of the base member. 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 to be opened; a lid plate insertion step of inserting a lid plate into the lid groove; and a side wall of the lid groove; And a main joining step in which frictional stirring is performed by relatively moving a rotating tool provided with a stirring pin along the abutting portion with the side surface of the lid plate, and the rotating stirring pin is joined in the main joining step. Friction stirring is performed in a state where only the stirring pin is in contact with the base member and the lid plate.

  According to such a manufacturing method, since the main joining step is performed after the base member and the cover plate are deformed so that tensile stress acts on the surface side of the base member and the lid plate in advance, the heat transfer plate is flattened by the heat shrinkage generated by the main joining step. can do. In addition, since only the stirring pin of the rotary tool contacts the base member and the cover plate, even if the surfaces of the base member and the cover plate are warped in a convex shape, the shoulder is removed from the base member and the cover member as in the conventional manufacturing method. Since it does not hit the cover plate, the operability of the rotating tool is improved.

  Further, since the shoulder does not contact the base member and the lid plate as in the conventional manufacturing method, the pressing force on the base member and the lid plate is reduced, and the width of the plasticized region is reduced as compared with the conventional manufacturing method. This makes it possible to bring the rotary tool closer to the concave groove than in the conventional manufacturing method, and the degree of freedom in designing the heat transfer plate is improved. In addition, the friction between the base member and the cover plate to be joined and the rotary tool can be reduced as compared with the conventional manufacturing method, and the load applied to the friction stirrer can be reduced. Thereby, friction stir welding can be easily performed up to a deep position of the abutting portion.

  Moreover, it is preferable to include the temporary joining process of temporarily joining the said abutting part before the said main joining process. According to this manufacturing method, it is possible to prevent the opening of the butt portion during the main joining step.

  Moreover, in the temporary joining step, it is preferable that only the stirring pin of the rotary tool is inserted into the abutting portion and temporarily joined. According to this manufacturing method, since the same rotary tool can be used in the main joining process and the temporary joining process, the manufacturing cycle can be shortened.

  Further, the amount of deformation of at least one of the base member and the cover plate is measured, and in the main joining step, friction stirring is performed while adjusting the insertion depth of the stirring pin in accordance with the amount of deformation. preferable.

  According to this manufacturing method, the depth position of the stirring pin with respect to the heat transfer plate can be kept constant.

  Further, the present invention provides a deformation step of deforming the base member and the lid plate so that the surface side is convex by applying a tensile stress to the surface side of the base member and the lid plate, and the surface of the base member. A closing step of superimposing the lid plate on the surface of the base member so as to cover the recessed groove or recess to be opened; a temporary joining step of temporarily joining the overlapping portion of the base member and the lid plate; and the lid plate And a main joining step of inserting a rotary tool having a stirring pin from the surface of the base member 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. In the step, the superposition part is frictionally stirred in a state where only the stirring pin is in contact with both the base member and the lid plate or only the lid plate.

  According to this manufacturing method, since the main joining process is performed after the base member and the cover plate are deformed so that tensile stress acts on the surface side of the base member and the lid plate in advance, the heat transfer plate is flattened by the heat shrinkage generated by the main joining process. can do. In addition, since only the stirring pin of the rotary tool contacts the lid plate, even if the surface of the base member is warped in a convex shape, the shoulder does not hit the lid plate as in the conventional manufacturing method. Operability is improved.

  In addition, since the shoulder does not contact the lid plate as in the conventional manufacturing method, the pressing force on the lid plate is reduced, and the width of the plasticized region is reduced as compared with the conventional manufacturing method. As a result, the rotating tool can be brought closer to the recessed groove or the recessed portion than the conventional manufacturing method, and the degree of freedom in designing the heat transfer plate is improved. In addition, the friction between the base member and the cover plate to be joined and the rotary tool can be reduced as compared with the conventional manufacturing method, and the load applied to the friction stirrer can be reduced. Thereby, friction stir welding can be easily performed up to a deep position of the abutting portion.

  Further, the amount of deformation of at least one of the base member and the cover plate is measured, and in the main joining step, friction stirring is performed while adjusting the insertion depth of the stirring pin in accordance with the amount of deformation. preferable.

  According to this manufacturing method, the depth position of the stirring pin with respect to the heat transfer plate can be kept constant.

  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 this manufacturing method, the surface of the heat transfer plate can be flattened.

  According to the method for manufacturing a heat transfer plate according to the present invention, a flat heat transfer plate can be manufactured, the operability of the rotary tool is good, and the degree of freedom in design is high.

(A) is the side view which showed the rotation tool for this joining of this embodiment, (b) is the schematic cross section which showed the joining form of the rotation tool for this joining. (A) is the side view which showed the rotary tool for temporary joining of this embodiment, (b) is the schematic cross section which showed the joining form of the rotary tool for temporary joining. (A) is a disassembled perspective view which shows the heat exchanger plate which concerns on 1st embodiment of this invention. (B) is a principal part side view of (a). It is a perspective view which shows the heat exchanger plate which concerns on 1st embodiment. It is a perspective view which shows the temporary joining process in the manufacturing method of the heat exchanger plate which concerns on 1st embodiment. It is a perspective view which shows the deformation | transformation process in the manufacturing method of the heat exchanger plate which concerns on 1st embodiment. (A) is a perspective view which shows a table, (b) is a perspective view which shows the preparatory process in the manufacturing method of the heat exchanger plate which concerns on 1st embodiment. (A) is a side view which shows the preparation process in the manufacturing method of the heat exchanger plate which concerns on 1st embodiment, (b) is sectional drawing which shows the main joining process in the manufacturing method of the heat exchanger plate which concerns on 1st embodiment. It is. It is a perspective view which shows the 1st modification concerning 1st embodiment. It is a perspective view which shows the 2nd modification which concerns on 1st embodiment, Comprising: (a) is a figure which shows a deformation | transformation process, (b) is a figure which shows a deformation | transformation process. It is a disassembled perspective view which shows the heat exchanger plate which concerns on 2nd embodiment of this invention. It is sectional drawing which shows this joining process which concerns on 2nd embodiment. It is a disassembled perspective view which shows the heat exchanger plate which concerns on 3rd embodiment of this invention. In the manufacturing method of the heat exchanger plate which concerns on 3rd embodiment, (a) is a perspective view which shows a temporary joining process, (b) is a perspective view which shows a preparatory process. It is sectional drawing which shows the main joining process in the manufacturing method of the heat exchanger plate which concerns on 3rd embodiment. (A) is a disassembled perspective view of the heat exchanger plate which shows the modification which concerns on 3rd embodiment, (b) is sectional drawing which shows this joining process in the modification which concerns on 3rd embodiment. (A) And (b) is sectional drawing which concerns on the manufacturing method of the conventional heat exchanger plate.

[First embodiment]
A heat transfer plate and a method for manufacturing the heat transfer plate according to the first embodiment of the present invention will be described in detail with reference to the drawings. First, the main joining rotary tool and the temporary joining rotary tool used in the present embodiment will be described.

  As shown to (a) of FIG. 1, this rotation tool F for joining is comprised by the connection part F1 and the stirring pin F2. The main joining rotary tool F corresponds to a “rotary tool” in the claims. The main rotating tool F for joining is formed of, for example, tool steel. The connection part F1 is a part connected to the rotating shaft D of the friction stirrer shown in FIG. The connecting portion F1 has a cylindrical shape, and is formed with screw holes B and B to which bolts are fastened.

  The stirring pin F2 hangs down from the connecting portion F1 and is coaxial with the connecting portion F1. The stirring pin F2 is tapered as it is separated from the connecting portion F1. A spiral groove F3 is formed on the outer peripheral surface of the stirring pin F2. In the present embodiment, the spiral groove F3 is formed in a counterclockwise direction from the proximal end toward the distal end in order to rotate the main joining rotary tool F to the right.

  In addition, when rotating this welding rotation tool F counterclockwise, it is preferable to form the spiral groove F3 in the clockwise direction from the proximal end toward the distal end. By setting the spiral groove F3 in this way, the plastic fluidized metal at the time of frictional stirring is guided to the tip side of the stirring pin F2 by the spiral groove F3. Thereby, the quantity of the metal which overflows to the exterior of a to-be-joined metal member (the base member 2 and the cover board 3 mentioned later) can be decreased.

  As shown in FIG. 1B, when the friction stir welding is performed using the main rotating tool F for welding, only the rotated stirring pin F2 is inserted into the metal member to be joined and connected to the metal member to be joined. It is moved away from the part F1. In other words, the friction stir welding is performed with the base end portion of the stirring pin F2 exposed. A plasticized region W is formed in the movement locus of the main rotating tool F for bonding by hardening the friction-stirred metal.

  As shown in FIG. 2A, the temporary joining rotary tool G includes a shoulder G1 and a stirring pin G2. The temporary joining rotary tool G is made of, for example, tool steel. As shown in FIG. 2B, the shoulder G1 is a part that is connected to the rotating shaft D of the friction stirrer and is a part that holds the plastic fluidized metal. The shoulder G1 has a cylindrical shape. The lower end surface of the shoulder G1 has a concave shape to prevent the fluidized metal from flowing out.

  The stirring pin G2 hangs down from the shoulder G1 and is coaxial with the shoulder G1. The stirring pin G2 is tapered as it is separated from the shoulder G1. A spiral groove G3 is formed on the outer peripheral surface of the stirring pin G2.

  As shown in FIG. 2B, when the friction stir welding is performed using the temporary welding rotary tool G, the rotated stirring pin G2 and the lower end surface of the shoulder G1 are inserted into the metal member to be joined and moved. Let A plasticized region W <b> 1 is formed in the movement locus of the temporary bonding rotary tool G by hardening the friction-stirred metal.

  Next, the heat transfer plate of this embodiment will be described. As shown to (a) of FIG. 3, the heat exchanger plate 1 which concerns on this embodiment is mainly comprised by the base member 2 and the cover plate 3. As shown in FIG. The base member 2 is a flat plate member. A concave groove 10 and a lid groove 11 are formed in the base member 2. The material of the base member 2 is not particularly limited as long as friction stirring is possible, but in this embodiment, it is an aluminum alloy.

  The concave groove 10 is formed in a serpentine shape in plan view on the surface 2 a of the base member 2. As shown in FIG. 3B, the recessed groove 10 is recessed in the bottom surface 11 a of the lid groove 11. In the present embodiment, the concave groove 10 has a rectangular cross section, but may have other shapes. The opening of the concave groove 10 is opened to the surface 2 a side of the base member 2. What is necessary is just to set the planar shape of the ditch | groove 10 suitably according to a use.

  The lid groove 11 is wider than the groove 10 and is formed continuously with the groove 10 on the surface 2 a side of the groove 10. The lid groove 11 has a rectangular shape in sectional view and is open to the surface 2a side.

  The lid plate 3 is a flat plate member inserted into the lid groove 11. In this embodiment, the cover plate 3 is formed of an aluminum alloy that is substantially the same material as the base member 2. The lid plate 3 has substantially the same shape as the hollow portion of the lid groove 11 so as to be inserted into the lid groove 11.

  As shown in FIGS. 3 and 4, the side walls 11b and 11b of the lid groove 11 and the side surfaces 3c and 3c of the lid plate 3 are abutted to form abutting portions J1 and J1. The abutting portions J1 and J1 are joined by friction stirring over the entire length in the depth direction. A space surrounded by the concave groove 10 of the heat transfer plate 1 and the back surface 3b of the lid plate 3 serves as a fluid flow path.

  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 main joining process, and a burr cutting process are performed.

  In the preparation process, an insertion process, a temporary bonding process, a deformation process, and a fixing process are performed. As shown in FIG. 3, in the insertion step, the lid plate 3 is inserted into the lid groove 11 of the base member 2, and the side walls 11b and 11b of the lid groove 11 and the side surfaces 3c and 3c of the lid plate 3 are brought into contact with each other. . Thereby, as shown in FIG. 5, the abutting parts J1 and J1 are formed. The surface 3a of the cover plate 3 and the surface 2a of the base member 2 are flush with each other.

  In the temporary bonding step, the base member 2 and the cover plate 3 are temporarily bonded. As shown in FIG. 5, in the temporary joining step, friction stir welding is performed on the abutting portions J <b> 1 and J <b> 1 using a temporary joining rotary tool G. A plasticized region W1 is formed in the movement locus of the temporary joining rotary tool G. Temporary joining may be performed continuously or may be performed intermittently as shown in FIG. Since the temporary bonding rotary tool G is small, the amount of thermal deformation of the base member 2 and the cover plate 3 in the temporary bonding is small.

  In the deformation step, the base member 2 and the cover plate 3 that are temporarily joined are deformed so that the surfaces 2a and 3a are convex. As shown in FIG. 6, in the present embodiment, the deformation process is performed using a press mold M. The press mold M is composed of a lower mold M1 and an upper mold M2. The lower mold M1 is formed larger than the base member 2, and in the present embodiment, the upper surface is a concave spherical surface. The upper mold M2 is formed larger than the base member 2, and in this embodiment, the lower surface is a convex spherical surface.

  In the deformation step, the base member 2 and the cover plate 3 that are temporarily joined are arranged on the lower mold M1, and then the upper mold M2 is lowered to deform the base member 2 and the cover plate 3. As a result, a tensile stress is applied to the surfaces 2a and 3a of the base member 2 and the cover plate 3 to cause plastic deformation so that the surfaces 2a and 3a are convex.

  As shown in FIG. 7, in the fixing step, the temporarily joined base member 2 and lid plate 3 are fixed to the table K. As shown in FIG. 7A, the table K includes a substrate K1 having a flat upper surface, a spacer K2 disposed at the center of the substrate K1, and four clamps respectively formed at four corners of the substrate K1. And K3. The spacer K2 has a cylindrical shape in the present embodiment. What is necessary is just to set the height of the spacer K2 suitably according to conditions, such as the amount of heat inputs of this joining process.

  As shown in FIG. 7B, in the fixing step, the base member 2 and the cover plate 3 deformed in the deformation step are arranged on the spacer K2, and the four corners are fixed with clamps K3. As shown to (a) of FIG. 8, it arrange | positions so that the surfaces 2a and 3a of the base member 2 and the cover board 3 may become convex by a fixing process.

  As shown in FIG. 8B, the main joining step is a step of performing friction stir welding on the abutting portions J1 and J1 by using the main welding rotating tool F. In the main joining step, friction stir welding is performed so as to trace the plasticized region W1 and the abutting portion J1 formed in the temporary joining step. In the main joining step, it is preferable to insert the main welding rotary tool F so that the front end of the main welding rotary tool F reaches the bottom surface 11 a of the lid groove 11.

  Since the stirring pin F2 is longer than the depth of the lid groove 11, even if the tip of the stirring pin F2 reaches the bottom surface 11a of the lid groove 11, the connecting portion F1 does not contact the base member 2 and the lid plate 3. . That is, in the main joining step, the lower end surface of the connecting portion F <b> 1 does not contact the surfaces of the base member 2 and the cover plate 3. A plasticized region W is formed in the movement trajectory of the main rotating tool for welding F. In this embodiment, it is preferable that the distance between the abutting portion J1 and the groove 10 is set so that the plastic fluid does not flow into the groove 10 when the main joining process is performed.

  Further, before the main joining step, the amount of deformation in the height direction of the base member 2 fixed to the table K is measured, and the insertion depth of the stirring pin F2 is adjusted in accordance with the amount of deformation in the main joining step. It is preferable to carry out friction stirring while doing so. That is, it is moved along the curved surfaces of the base member 2 and the surfaces 2a, 3a of the cover plate 3 so that the movement trajectory of the main welding rotary tool F becomes a curve. By doing so, the depth and width of the plasticized region W of the base member 2 can be made constant.

  In addition, what is necessary is just to use a well-known height detection apparatus about the measurement of the deformation amount of the base member 2 and the cover board 3. FIG. Further, for example, using the friction stirrer equipped with the detection device for detecting the height from the table K to at least one of the surface 2a of the base member 2 and the surface 3a of the lid plate 3, the base member 2 and the lid The main joining step may be performed while detecting the deformation amount of the plate 3.

  When the main joining process is completed, the base member 2 and the cover plate 3 are detached from the clamp K3 and left to stand. Since the plasticized region W formed by the main joining process is thermally contracted, the base member 2 and the cover plate 3 are deformed in a concave shape on the surfaces 2a and 3a side. As a result, the base member 2 and the cover plate 3 become flat as a result.

  The burr cutting step is a step of removing burrs generated on the base member 2 and the cover plate 3 after the main joining step. Thus, the heat transfer plate 1 shown in FIG. 4 is completed.

  According to the method for manufacturing the heat transfer plate according to the present embodiment described above, the surface 2a, 3a side of the base member 2 and the cover plate 3 is subjected to tensile stress so that the surfaces 2a, 3a side are convex. Since the main joining process is performed in a state of being fixed to the table K after being plastically deformed and projecting toward the surfaces 2a and 3a, the heat transfer plate 1 can be flattened by heat shrinkage generated by the main joining process. it can.

  Moreover, since only the stirring pin F2 of the main rotating tool F for welding is in contact with the base member 2 and the cover plate 3, the surfaces 2a and 3a of the base member 2 and the cover plate 3 are warped in a convex shape. However, since the connecting portion F1 does not hit the base member 2 and the cover plate 3, the operability of the welding rotary tool F is improved.

  In addition, since the connecting portion F1 of the main rotating tool F for welding is not in contact with the surface 2a, 3a of the base member 2 and the cover plate 3, the pressing force on the base member 2 and the cover plate 3 is reduced, and the conventional manufacturing method In comparison, the width of the plasticized region W becomes smaller. Thereby, it becomes possible to make the main rotating tool F closer to the concave groove 10 than before, and the degree of freedom in designing the heat transfer plate is improved. In addition, the friction between the base member 2 and the cover plate 3 to be joined and the main joining rotary tool F can be reduced as compared with the conventional manufacturing method, and the load applied to the friction stirrer can be reduced. Thereby, friction stir welding can be easily performed to a deep position of the abutting portion J1. Further, although it is not always necessary to carry out friction stirring over the entire depth direction of the abutting portion J1, the water tightness and airtightness of the heat transfer plate 1 are improved by friction stirring over the entire depth direction of the abutting portion J1. Can be made.

  Moreover, by performing a temporary joining process, when performing a main joining process, the opening of the base member 2 and the cover board 3 can be prevented. Moreover, the heat exchanger plate 1 can be finished finely by performing a burr cutting process.

  In addition, before performing this joining process, you may perform the tab material arrangement | positioning process which arrange | positions a tab material. Although not specifically shown, one or more tab materials are attached to the side surface of the base member 2 in the tab material arranging step. In the main joining step, it is possible to perform the friction stir welding by providing the tab material with a start position and an end position. When the main joining process is completed, the tab material may be cut out from the base member 2. By using the tab material, the side surface of the heat transfer plate 1 can be finished cleanly. Moreover, the workability | operativity of this joining process can be improved.

  In this embodiment, the height position of the main welding rotary tool F with respect to the table K is changed according to the deformation amount of the base member 2 and the cover plate 3, but the main welding rotary tool F with respect to the table K is changed. The main bonding step may be performed with the height position of the substrate fixed.

  Moreover, in this embodiment, after performing the temporary joining process, although the deformation | transformation process was performed, it is not limited to this. Before performing an insertion process, after performing a deformation | transformation process with respect to the base member 2 and the cover board 3, respectively, you may carry out in order of an insertion process, a temporary joining process, and a fixing process.

  Further, the substrate K1 and the spacer K2 of the table K may be integrated. In the present embodiment, the spacer K2 is disposed on the substrate K1 of the table K in the fixing process, but the base member 2 and the cover plate 3 are formed in a curved surface that protrudes toward the surfaces 2a and 3a by the deformation process. Therefore, it is not always necessary to use the spacer K2. That is, the table K may be configured to hold the base member 2 and the cover plate 3 so as to be convex upward by a jig such as a clamp even if the upper surface of the substrate K1 is flat.

  In the temporary bonding step, the temporary bonding rotary tool G is used in the present embodiment, but temporary bonding may be performed using the main bonding rotating tool F. In this case, only the tip of the stirring pin F2 of the main rotating tool for welding F is inserted into the abutting portion J1, and friction stirring is performed. When temporary bonding is performed using the main rotating tool F, the manufacturing cycle can be shortened because the rotating tool need not be replaced.

  Further, as shown in FIG. 6, in the deformation process of the present embodiment, the base member 2 and the surfaces 2a and 3a of the lid plate 3 are curved so as to be substantially spherical. That is, in the deformation process, the opposing one side 2c, 2c and the other opposing side 2d, 2d of the base member 2 are curved so as to protrude downward, but the invention is not limited to this. . For example, when the lower mold M1 has a cylindrical surface with a concave upper surface, and the upper mold M2 has a cylindrical surface with a convex lower surface, the opposing sides 2c, 2c of the base member 2 are linear. Alternatively, the other sides 2d and 2d may be curved so as to protrude downward. Alternatively, the other sides 2d and 2d may be curved so that one side 2c and 2c is convex downward while the other sides 2d and 2d remain straight.

  Moreover, when the groove | channel formed by friction stirring becomes large after this joining process, you may repair by performing build-up welding to the said groove | channel. Alternatively, the lid member may be disposed in the groove and repaired by joining the lid member and the base member 2 by friction stirring or the like.

[First modification]
Next, the 1st modification of the manufacturing method of the heat exchanger plate which concerns on 1st embodiment is demonstrated. As shown in FIG. 9, in the first modification, the deformation process is different from the above-described embodiment. In the first modified example, a description will be given focusing on parts different from the above-described embodiment.

  As shown in FIG. 9, in the deformation process according to the first modification, the base member 2 and the cover plate 3 are deformed using the press device H. The press device H mainly includes a gantry H1 having a flat surface, spacers H2 disposed at four corners of the gantry H1, an auxiliary member H3 disposed at the center of the back surface 2b of the base member 2, and a punch H4. Has been.

  In the deformation step, the temporarily joined base member 2 and cover plate 3 are arranged so that the back surface 2b of the base member 2 faces upward, and the auxiliary member 3H is arranged in the center of the back surface 2b. Then, the punch H4 is lowered and a tensile stress is applied to the surface 2a, 3a side of the base member 2 and the cover plate 3 so that the surface 2a, 3a side is plastically deformed. Thereby, it deform | transforms so that the surface 2a, 3a side of the base member 2 and the cover plate 3 may become convex shape.

  In the above-described embodiment, the base member 2 and the cover plate 3 are deformed using the press mold M, but may be deformed using the press device H as in the first modification. By using the spacer H2 and the auxiliary member H3, it is possible to prevent the base member 2 and the cover plate 3 from being damaged.

[Second modification]
Next, the 2nd modification of the manufacturing method of the heat exchanger plate which concerns on 1st embodiment is demonstrated. As shown in FIG. 10, in the second modification, the modification process is different from the above-described embodiment. In the second modified example, description will be made centering on parts different from the above-described embodiment.

  As shown to (a) of FIG. 10, in the deformation | transformation process which concerns on a 2nd modification, friction stirring is performed and the base member 2 and the cover board 3 are deformed. In the deformation process according to the second modification, friction stirring is performed on the back surface 2b of the base member 2 using the main rotating tool for joining F. In the friction agitation, the main welding rotary tool F is placed in the same path as the abutting portions J1 and J1 with only the stirring pin F2 of the main welding rotary tool F in contact with the base member 2 and the cover plate 3. Move. The insertion depth of the stirring pin F2 is set so as to be larger than the insertion depth of the stirring pin F2 in the subsequent main joining step.

  According to the deformation process according to the second modification, the two plasticized regions W are formed by friction stirring of the main rotating tool F for welding. As a result, as shown in FIG. 10B, heat shrinkage occurs, the back surface 2b side of the base member 2 becomes concave, and the base member 2 and the front surfaces 2a and 3a of the cover plate 3 become convex. . The fixing process and the main joining process are performed in the same manner as in the first embodiment.

  In the above-described embodiment, the base member 2 and the cover plate 3 are deformed using the press mold M. However, as in the second modification, the base member 2 and the cover plate 3 may be deformed by heat shrinkage generated by friction stirring. In the second modified example, since the same main-joining rotary tool F is used in the deforming step and the main-joining step, it is possible to reduce labor.

  Note that the movement trajectory of the main welding rotary tool F in the deformation process according to the second modification is not limited to the above-described trajectory, and may be appropriately set according to the movement trajectory of the main welding rotary tool F in the main welding process. Good. Further, the type of the rotary tool in the deformation process may be set as appropriate so that heat shrinkage occurs and the base member 2 and the cover plate 3 are deformed into a concave shape.

  At this time, it is preferable that the deformation step is set to be larger than the heat input amount of the friction stirrer in the main joining step. As shown in FIG. 7B, in the main joining step, the corners of the base member 2 other than the four corners and the center are separated from the table K, so that the heat generated in the main joining step is difficult to extract from the table K to the outside. ing. For this reason, if the heat input amount in the main joining step is set smaller than the heat input amount in the deformation step, the heat shrinkage is balanced and the heat transfer plate is likely to be flat.

  Although not shown in the drawings, in the deformation process, the surface 2a, 3a side of the base member 2 and the cover plate 3 may be deformed by another method so as to be convex. For example, the back surface 2b of the base member 2 may be struck and deformed using a tool such as a hammer. Further, the base member 2 and the cover plate 3 may be deformed by roll deformation using a plurality of cylindrical tubes and auxiliary members.

[Second Embodiment]
Next, a heat transfer plate and a method for manufacturing the heat transfer plate according to the second embodiment of the present invention will be described. As shown in FIG. 11, the heat transfer plate 1B according to the second embodiment is different from the first embodiment in that a heat medium pipe 4 is used. The heat transfer plate 1 </ b> B includes a base member 2, a cover plate 3, and a heat medium pipe 4.

  The base member 2 includes a concave groove 10 and a lid groove 11. The bottom surface of the groove 10 is curved so that the heat medium pipe 4 is in surface contact. The width and height of the concave groove 10 are substantially the same as the outer diameter of the heat medium pipe 4. The heat medium pipe 4 is a hollow pipe inserted into the concave groove 10. The heat medium pipe 4 is a member through which the heat medium flows.

  Since the heat transfer plate manufacturing method according to the second embodiment is substantially the same as the first embodiment except that the heat medium pipe 4 is inserted into the concave groove 10 in the preparation step, the detailed description will be given. Omitted. According to the method for manufacturing a heat transfer plate according to the second embodiment, a heat transfer plate including the heat medium pipe 4 can be manufactured, and substantially the same effect as that of the first embodiment can be obtained.

  In the second embodiment as well, the deformation process is performed before the insertion process to apply a tensile stress to the surface 2a side of the base member 2 so that the surface 2a side has a convex shape. The tube 4 may be separately deformed into a convex shape.

  In addition, as shown in FIG. 12, in the main joining step of the heat transfer plate manufacturing method according to the second embodiment, the plastic fluidizing material may flow into the gap Q around the heat medium pipe 4. Good. The water-tightness and airtightness of the heat transfer plate can be improved by allowing the plastic fluidizing material to flow into the gap Q surrounded by the lid plate 3, the heat medium pipe 4 and the concave groove 10.

[Third embodiment]
Next, the manufacturing method of the heat exchanger plate which concerns on 3rd embodiment of this invention is demonstrated. As shown in FIG. 13, in the heat transfer plate manufacturing method according to the third embodiment, a heat transfer plate is manufactured using a base member 22 and a cover plate 23.

  The base member 22 is a flat plate member. A concave groove 30 is formed on the surface 22 a of the base member 22. The concave groove 30 is open upward and has a serpentine shape in plan view. What is necessary is just to set the planar shape of the ditch | groove 30 suitably according to a use.

  The lid plate 23 is a flat plate member. In this embodiment, the cover plate 23 has substantially the same shape as the base member 22, but may be a member that closes at least the entire groove 30.

  In the method for manufacturing a heat transfer plate according to the third embodiment, a preparation process, a main joining process, and a burr cutting process are performed. In the preparation step, a concave groove closing step, a temporary joining step of temporarily joining the base member 22 and the cover plate 23, and a deformation step of deforming the base member 22 and the surface 22a, 23a side of the cover plate 23 to be convex. Then, a fixing step of fixing the deformed base member 22 and the cover plate 23 to the table K is performed.

  As shown in FIG. 13 and FIG. 14A, the ditch closing process is a process of placing the cover plate 23 on the surface 22 a of the base member 22 and covering the upper side of the ditch 30. In the concave groove closing step, the surface 22a of the base member 22 and the back surface 23b of the lid plate 23 are overlapped to form the overlap portion J2.

  As shown in FIG. 14A, in the temporary joining step, the base member 22 and the lid plate 23 are temporarily joined by welding. Temporary joining is performed intermittently or continuously along the overlapping portion J2 between the base member 22 and the lid plate 23. Instead of welding, temporary joining may be performed on the overlapping portion J2 by using the temporary joining rotary tool G.

  In the deformation step, the base member 22 and the surfaces 22a and 23a of the cover plate 23 that have been temporarily joined are deformed so as to be convex. As a method of deforming, for example, the above-described press mold M or press apparatus H may be used, or deformation may be performed using heat shrinkage of friction stirring.

  As shown in FIG. 14B, in the fixing step, the deformed base member 22 and the cover plate 23 are arranged so that the surfaces 22a and 23a are convex, and the four corners are fixed with clamps K3.

  As shown in FIG. 15, the main joining step is a step of inserting the rotary tool F for main joining from the surface 23 a of the lid plate 23, moving it on the lid plate 23, and performing friction stir welding on the overlapping portion J <b> 2. is there. In the main joining step, it is preferable to insert the main welding rotary tool F so that the tip of the main welding rotary tool F reaches the base member 22. A plasticized region W is formed in the movement trajectory of the main rotating tool for welding F. The distance between the overlapping portion J2 and the groove 30 is preferably set so that the plastic fluid material does not flow into the groove 30 when the main joining process is performed.

  Furthermore, before the main joining step, the amount of deformation in the height direction of the base member 22 and the cover plate 23 fixed to the table K is measured, and in the main joining step, the stirring pin F2 is adjusted according to the amount of deformation. Friction stirring is preferably performed while adjusting the insertion depth. That is, it is moved along the curved surface of the surface 23a of the cover plate 23 so that the movement locus of the main welding rotary tool F becomes a curve. By doing so, the depth and width of the plasticized region W can be made constant.

  In addition, about the measurement of the deformation amount of the base member 22 and the cover plate 23, using the friction stirrer equipped with the detection device which detects the height from the table K to the surface 23a of the cover plate 23, the base member 22 and The main joining step may be performed while detecting the deformation amount of at least one of the lid plates 23. In the present embodiment, it is only necessary to measure at least one of the base member 22 and the lid plate 23. In the case of this embodiment, the deformation amount of the base member 22 may be measured from the back surface side of the heat transfer plate 21 and converted into the deformation amount on the front surface side of the heat transfer plate 21.

  When the main joining step is completed, the base member 22 and the cover plate 23 are detached from the clamp K3 and left to stand. Thereby, since the plasticization area | region W formed by this joining process heat-shrinks, the base member 22 and the cover board 23 deform | transform in the direction which becomes concave shape on the surface 22a, 23a side. As a result, the base member 22 and the cover plate 23 become flat.

  The burr cutting process is a process of removing burrs generated on the base member 22 and the cover plate 23 after the main joining process. Thus, the heat transfer plate 21 is completed.

  According to the heat transfer plate manufacturing method according to the present embodiment described above, the table K is subjected to plastic deformation by applying tensile stress to the surfaces 22a and 23a of the base member 22 and the cover plate 23 in advance in the deformation step. Since the main joining step is performed in a state where the surfaces 22a and 23a are convex, the heat transfer plate 21 can be flattened by heat shrinkage generated by the main joining step.

  Moreover, since only the stirring pin F2 of the rotation tool F for main joining will contact the base member 22 and the cover plate 23, even if the surface 23a of the cover plate 23 warps convexly, the connection part F1 is Since it does not hit the cover plate 23, the operability of the main rotating tool F is improved.

  In addition, since the connecting portion F1 of the rotating tool F for main joining does not come into contact with the surface 23a of the lid plate 23, the pressing force against the lid plate 23 is reduced, and the width of the plasticized region W is smaller than that in the conventional manufacturing method. Become. This makes it possible to bring the main welding rotary tool F closer to the concave groove 30 than in the conventional manufacturing method, and the degree of freedom in designing the heat transfer plate is improved. Further, the friction between the base member 22 and the cover plate 23 to be joined and the main joining rotary tool F can be reduced as compared with the conventional manufacturing method, and the load applied to the friction stirrer can be reduced. Thereby, even when the superposition | polymerization part J2 exists in a deep position, friction stir welding can be performed easily.

  Moreover, by performing a temporary joining process, when performing this joining process, the opening of the base member 22 and the cover plate 23 can be prevented. Moreover, the heat transfer plate 21 can be finished finely by performing the burr cutting process.

[Modification]
Next, the modification of the manufacturing method of the heat exchanger plate which concerns on 3rd embodiment is demonstrated. As shown in FIG. 16, in this modification, the shape of the base member 22A is different from that of the third embodiment. A recess 31 is formed in the surface 22Aa of the base member 22A of the modification. The concave portion 31 is a hollow portion that opens upward and presents a rectangular parallelepiped.

  In the method for manufacturing a heat transfer plate according to the modification, a preparation process, a main joining process, and a burr cutting process are performed. Since the preparation process and the burr cutting process are substantially the same as those in the third embodiment, detailed description thereof is omitted. As shown in FIG. 16 (b), in the main joining process, the main joining rotary tool F is inserted from the surface 23a of the cover plate 23, and is rotated around the concave portion 31 while being overlapped with the overlapping portion J2. Friction stir welding is performed. Thereby, the heat transfer plate 21A can be manufactured. According to the modification, an effect substantially equivalent to that of the third embodiment can be obtained.

  In this embodiment, the tip of the stirring pin F2 is set so as to be pushed into the position reaching the base member 22, but is set so as not to reach the base member 22, that is, only the stirring pin F2 and the lid plate 23 are set. It may be set so that the overlapping portion J2 is frictionally stirred by being pushed to the position where it contacts. In such a case, the base member 22 and the cover plate 23 are plastically fluidized by the frictional heat generated by the contact between the stirring pin F2 and the cover plate 23, thereby joining the overlapping portion J2.

  In the present embodiment, the main welding rotary tool F is inserted from the front surface 23a of the cover plate 23. However, the main welding rotary tool F is inserted from the rear surface 22Ab of the base member 22 to friction stir the overlapping portion J2. You may do it. Even in this case, the agitation pin F2 may be pushed to a position where it contacts both the base member 22 and the cover plate 23, or may be pushed to a position where only the base member 22 is brought into contact, and set so as to be frictionally stirred. May be.

  Moreover, in 3rd embodiment and its modification, although the form with the ditch | groove 30 or the recessed part 31 was illustrated, you may use base member 22A without the ditch | groove 30 or the recessed part 31. FIG. In other words, the heat transfer plate may be manufactured by joining the base member 22A having a rectangular parallelepiped shape and the lid plate 23 having a rectangular parallelepiped shape.

DESCRIPTION OF SYMBOLS 1 Heat-transfer plate 2 Base member 3 Lid plate 4 Heat medium pipe 10 Groove 11 Lid groove F Rotating tool for main joining (rotating tool)
F1 Stirring pin G Temporary joining rotary tool J1 Butting part J2 Superposition part W Plasticization region

Claims (8)

Deformation step of deforming the base member and the lid plate so that the surface side is convex by applying a tensile stress to the surface side of the base member and the lid plate;
A lid groove closing step of inserting the lid plate into a lid groove formed around a concave groove opening on the surface of the base member;
A main joining step in which friction stirring is performed by relatively moving a rotary tool provided with a stirring pin along the abutting portion between the side wall of the lid groove and the side surface of the lid plate,
In the main joining step, the rotated stirring pin is inserted into the abutting portion, and friction stirring is performed in a state where only the stirring pin is in contact with the base member and the lid plate. Production method. Deformation step of deforming the base member and the lid plate so that the surface side is convex by applying a tensile stress to the surface side of the base member and the lid plate;
A heat medium pipe insertion step of inserting a heat medium pipe into a concave groove formed on the bottom surface of the lid groove opening 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 friction stirring is performed by relatively moving a rotary tool provided with a stirring pin along the abutting portion between the side wall of the lid groove and the side surface of the lid plate,
In the main joining step, the rotated stirring pin is inserted into the abutting portion, and friction stirring is performed in a state where only the stirring pin is in contact with the base member and the lid plate. Production method.   The method for manufacturing a heat transfer plate according to claim 1, further comprising a temporary bonding step of temporarily bonding the abutting portions before the main bonding step.   The method for manufacturing a heat transfer plate according to claim 3, wherein in the temporary joining step, only the stirring pin of the rotary tool is inserted into the abutting portion and temporarily joined.   The deformation amount of at least one of the base member and the cover plate is measured, and in the main joining step, the friction stir is performed while adjusting the insertion depth of the stirring pin according to the deformation amount. The manufacturing method of the heat exchanger plate as described in any one of Claim 1 thru | or 4 to do. Deformation step of deforming the base member and the lid plate so that the surface side is convex by applying a tensile stress to the surface side of the base member and the lid plate;
A closing step of superimposing the lid plate on the surface of the base member so as to cover a concave groove or a recess opening on the surface of the base member;
A temporary joining step of temporarily joining the overlapping portion of the base member and the lid plate;
Inserting a rotary tool with a stirring pin from the surface of the lid 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,
In the main joining step, the superposition part is frictionally stirred in a state where only the stirring pin is in contact with both the base member and the lid plate or only the lid plate. Production method.   The deformation amount of at least one of the base member and the cover plate is measured, and in the main joining step, the friction stir is performed while adjusting the insertion depth of the stirring pin according to the deformation amount. The manufacturing method of the heat exchanger plate of Claim 6.   The heat transfer plate according to any one of claims 1 to 7, further comprising a burr cutting step of cutting a burr generated by frictional stirring of the rotary tool after the main joining step. Production method.

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