JP5434251B2 - Manufacturing method of heat transfer plate - Google Patents

Description

  The present invention relates to a method for manufacturing a heat transfer plate used in, for example, a heat exchanger, a heating device, a cooling device, or the like.

  A heat transfer plate arranged in contact with or close to an object to be heat exchanged, heated or cooled is provided with a heat medium pipe for circulating a heat medium such as high-temperature liquid or cooling water through a base member as a main body. It is formed by insertion.

  For example, Patent Document 1 describes a heat transfer plate that includes a base member, a heat medium tube and a cover plate inserted into the base member, and the base member and the cover plate are integrally formed by friction stir welding. Has been. FIG. 21 is a side view showing a conventional heat transfer plate. A conventional heat transfer plate 100 has a base member 102 having a lid groove 105 having a rectangular cross-section opening on the surface and a concave groove 108 opening on the bottom surface of the lid groove 105, and a heat medium inserted into the concave groove 108. A tube 116 and a lid plate 110 inserted into the lid groove 105 are provided. The heat transfer plate 100 is subjected to friction stir welding along the abutting portions J and J where the both side walls 106 and 106 of the lid groove 105 and the both side surfaces 113 and 114 of the lid plate 110 are abutted, thereby forming the plasticized region W. , W are formed.

JP 2004-314115 A

  In the heat transfer plate 100, gaps 120, 120 are formed by the concave groove 108, the outer peripheral surface of the heat medium pipe 116, and the lower surface of the lid plate 110, but the gap 120 exists inside the heat transfer plate 100. In this case, the heat radiated from the heat medium pipe 116 becomes difficult to be transmitted to the cover plate 110 and the base member 102, so that the heat exchange efficiency of the heat transfer plate 100 is lowered. Further, as shown in FIG. 21, since heat shrinkage occurs in the plasticized regions W and W formed by friction stirring, there is a problem that the heat transfer plate 100 is distorted in a concave shape when viewed from the side.

  From such a viewpoint, an object of the present invention is to provide a method for manufacturing a heat transfer plate having high heat exchange efficiency and high flatness.

  The manufacturing method of the heat transfer plate according to the present invention that solves such a problem includes an insertion step of inserting a heat medium pipe into a concave groove formed on the bottom surface of the lid groove that opens on the surface side of the base member, A lid groove closing step of inserting a lid plate having a main body portion inserted into the lid groove and a convex portion inserted into the concave groove into the lid groove; a side wall of the lid groove; and a side surface of the lid plate A main joining step of performing a friction stir welding by relatively moving the rotating tool along the abutting portion of the base member, and a correcting step of moving the rotating tool relative to the back surface of the base member to perform the friction stirring. And

  According to this manufacturing method, since the cover plate has the convex portion that is inserted into the concave groove, the gap formed around the heat medium pipe can be reduced. Thereby, the heat exchange efficiency of a heat exchanger plate can be improved. Further, in the correction process, by performing frictional stirring from the back surface side of the base member, heat shrinkage occurs also on the back surface side of the heat transfer plate, so that the flatness of the heat transfer plate can be improved.

  Moreover, in the said correction process, it is preferable to set the volume amount of the plasticization area | region formed in the back surface of the said heat exchanger plate smaller than the volume amount of the plasticization area | region formed in the surface side of the said heat exchanger plate. . According to this manufacturing method, the flatness of the heat transfer plate can be further improved. The basis will be described in the examples.

Moreover, in the said correction process, it is preferable to set so that the planar shape of the plasticization area | region formed in this correction process may become substantially point symmetrical with respect to the center of the said heat exchanger plate. Moreover, in the said correction process, it is preferable to set the planar shape of the plasticization area | region formed in this correction process so that it may become a shape substantially similar to the shape of the outer edge of the said heat exchanger plate. In the straightening step, the planar shape of the plasticized region formed in the straightening step is set to be substantially the same shape as the planar shape of the plasticized region formed on the surface side of the heat transfer plate. Is preferred. Moreover, in the said correction process, it is preferable to set so that the full length of the plasticization area | region formed in this correction process may become equivalent to the full length of the plasticization area | region formed in the surface side of the said heat exchanger plate.

  According to this manufacturing method, since the warpage of the front surface side and the back surface side of the heat transfer plate can be eliminated in a balanced manner, the flatness of the heat transfer plate can be further improved.

  Moreover, in the said correction process, it is preferable to set so that the full length of the plasticization area | region formed in this correction process may become shorter than the full length of the plasticization area | region formed in the surface side of the said heat exchanger plate. Moreover, it is preferable to set the outer diameter of the shoulder part of the rotary tool used in the straightening process to be smaller than the outer diameter of the shoulder part of the rotary tool used in the main joining process. Moreover, it is preferable to set the length of the stirring pin of the rotary tool used in the correction step to be smaller than the length of the stirring pin of the rotary tool used in the main joining step.

  According to this manufacturing method, since the volume amount of the plasticized region in the straightening process can be set lower than the volume amount of the plasticized region in the joining step, the flatness of the manufactured heat transfer plate is further increased. be able to.

  Moreover, it is preferable to set the thickness of the base member to 1.5 times or more the outer diameter of the shoulder portion of the rotary tool used in the main joining step. Moreover, it is preferable to set the thickness of the base member to be three times or more of the length of the stirring pin of the rotating tool used in the main joining step.

  According to such a manufacturing method, since the base member has a sufficient thickness with respect to the size of each part of the bonding rotary tool, the flatness of the heat transfer plate can be further improved.

  Moreover, when the said base member is a planar view polygon, it is preferable that the said correction process includes the corner friction stirring process of performing friction stirring using the rotation tool with respect to the corner of the said heat exchanger plate. According to this manufacturing method, the warp generated at the corner of the base member can be eliminated and the flatness of the heat transfer plate can be eliminated.

  Further, after the straightening step, a chamfering step of chamfering the back surface side of the heat transfer plate is included, and the depth of the chamfering step is larger than the length of the stirring pin of the rotary tool used in the straightening step. It is preferable. According to this manufacturing method, the back surface of the heat transfer plate can be formed smoothly.

  According to the method for manufacturing a heat transfer plate according to the present invention, a heat transfer plate having high heat exchange efficiency and high flatness can be provided.

It is the figure which showed the heat exchanger plate which concerns on 1st embodiment, Comprising: (a) is a perspective view, (b) is II sectional drawing. It is the figure which showed the heat exchanger plate which concerns on 1st embodiment, Comprising: (a) is a decomposition | disassembly side view, (b) is a side view. It is the side view which showed the manufacturing method of the heat exchanger plate which concerns on 1st embodiment, (a) is the figure which showed the cutting process, (b) is the figure which showed the insertion process, c) is a diagram showing a lid groove closing step. (A) shows the rotating tool for joining which concerns on 1st embodiment, (b) is the side view which showed the rotating tool for correction which concerns on 1st embodiment. In the manufacturing method of the heat exchanger plate which concerns on 1st embodiment, it is the perspective view which showed the cover groove | channel closing process. In the manufacturing method of the heat exchanger plate which concerns on 1st embodiment, it is the top view which showed the main joining process in steps. It is sectional drawing which showed this joining process in the manufacturing method of the heat exchanger plate which concerns on 1st embodiment. In the manufacturing method of the heat exchanger plate which concerns on 1st embodiment, it is the figure which showed this joining process, (a) is a perspective view, (b) is sectional drawing. In the manufacturing method of the heat exchanger plate which concerns on 1st embodiment, it is the figure which showed the correction process, Comprising: (a) is a perspective view, (b) is a top view. It is the figure which showed the heat exchanger plate which concerns on 2nd embodiment, Comprising: (a) is a perspective view, (b) is sectional drawing. In the manufacturing method of the heat exchanger plate which concerns on 2nd embodiment, it is the perspective view which showed the main joining process after. It is the top view which showed the correction process in the manufacturing method of the heat exchanger plate which concerns on 2nd embodiment. In the manufacturing method of the heat exchanger plate which concerns on 2nd embodiment, it is the figure which showed the chamfering process, Comprising: It is II-II sectional drawing of (b) of FIG. It is the top view which showed the 1st modification of the correction process. It is the top view which showed the other modification of the correction process. It is sectional drawing which showed the main joining process which concerns on 3rd embodiment. It is sectional drawing which showed the main joining process which concerns on 4th embodiment. It is sectional drawing which showed the main joining process which concerns on 5th embodiment. It is sectional drawing which showed the main joining process which concerns on 6th embodiment in steps. It is the figure which showed the Example, Comprising: (a) is a perspective view, (b) is a top view. It is the side view which showed the conventional heat exchanger plate.

[First embodiment]
Embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the heat transfer plate 1 according to the first embodiment is disposed on a thick plate-shaped base member 2, a heat medium pipe 3 disposed inside the base member 2, and the base member 2. The lid plate 4 is mainly formed by surface plasticization regions W1 and W1 formed by friction stir welding. Here, the “plasticization region” includes both a state heated by frictional heat of the rotary tool and actually plasticized, and a state where the rotary tool passes and returns to room temperature.

  The base member 2 is made of, for example, an aluminum alloy (JIS: A6061). The base member 2 serves to transmit the heat of the heat medium flowing through the heat medium tube 3 to the outside, or to transmit the external heat to the heat medium flowing through the heat medium tube 3. As shown, the heat medium pipe 3 is housed inside. As shown in FIGS. 2A and 2B, a lid groove 6 having a rectangular cross-sectional view is formed in the surface 2 a of the base member 2, and a lid is formed at the center of the bottom surface 6 c of the lid groove 6. A concave groove 7 narrower than the groove 6 is provided. The lid groove 6 is a portion where the lid plate 4 covering the heat medium pipe 3 is disposed, and has a substantially horseshoe shape in plan view. The lid groove 6 includes side walls 6 a and 6 b that rise vertically from the bottom surface 6 c of the lid groove 6.

  The concave groove 7 is a portion into which the heat medium pipe 3 is inserted, and has a substantially horseshoe shape in plan view. The concave groove 7 is a U-shaped groove having an upper opening, and a semicircular bottom 7 a having a radius of curvature equivalent to the outer periphery of the heat medium pipe 3 is formed at the lower end. Thereby, the heat | fever medium pipe | tube 3 and the bottom part 7a of the ditch | groove 7 can be closely_contact | adhered. The opening of the concave groove 7 is formed with a width substantially equal to the outer diameter of the heat medium pipe 3. Further, the depth of the groove 7 is formed to be equal to the outer diameter of the heat medium pipe 3.

  The heat medium pipe 3 is formed of, for example, a copper pipe, and is a cylindrical pipe having a hollow portion 3a having a circular cross section as shown in FIG. The outer diameter of the heat medium pipe 3 is formed substantially equal to the width and depth of the groove 7. Since the heat medium pipe 3 is a member inserted into the concave groove 7, it has a substantially horseshoe shape in plan view, like the concave groove 7.

  The heat medium pipe 3 is a member that circulates a heat medium such as a high-temperature liquid or a high-temperature gas in the hollow portion 3a and transmits heat to the base member 2 and the cover plate 4, or a cooling water that flows into the hollow portion 3a. Or a heat medium such as cooling gas is circulated and heat is transmitted from the base member 2 and the cover plate 4. Moreover, you may utilize as a member which transmits the heat which generate | occur | produces from a heater through the hollow part 3a of the pipe | tube 3 for heat media to the base member 2 and the cover board 4, for example.

  As shown in FIGS. 2A and 2B, the cover plate 4 is made of the same aluminum alloy as the base member 2, and has a substantially flat main body 11 and a lower surface (bottom surface) of the main body 11. It has the convex part 12 provided by protrusion. Since the lid plate 4 is a member inserted into the lid groove 6, the lid plate 4 has a substantially horseshoe shape in plan view like the lid groove 6. The main body 11 has a rectangular cross section substantially the same as the cross section of the lid groove 6 of the base member 2, and has an upper surface (front surface) 13, a lower surface (bottom surface) 14, a side surface 15a, and a side surface 15b.

  The convex portion 12 extends downward from the center of the lower surface 14 of the main body portion 11 with a width substantially equal to the concave groove 7, and the bottom surface 12 a is formed in a concave shape. The curvature of the bottom surface 12 a is formed to be equal to the curvature of the outer periphery of the heat medium pipe 3.

  As shown in FIG. 2B, when the heat medium pipe 3 is arranged on the base member 2, the lower half portion of the heat medium pipe 3 and the bottom 7a of the groove 7 are in surface contact or fine. Opposite with a gap. The upper end of the heat medium pipe 3 is at the same height as the bottom surface 6 c of the lid groove 6. Further, when the cover plate 4 is arranged in the cover groove 6, the convex portion 12 of the cover plate 4 is inserted around the heat medium pipe 3, and the upper surface 13 of the cover plate 4 and the surface 2 a of the base member 2 are arranged. Becomes the same. Further, the side surfaces 15a and 15b of the cover plate 4 are in surface contact with the side walls 6a and 6b of the cover groove 6 or face each other with a fine gap. The abutting portion between the side surface 15a and the side wall 6a is a butting portion J1, and the butting portion between the side surface 15b and the side wall 6b is a butting portion J2.

  In the present embodiment, the outer diameter of the heat medium pipe 3 and the depth of the concave groove 7 are set to be equal, but the depth of the concave groove 7 is set to be larger than the outer diameter of the heat medium pipe 3. May be. In this case, it is preferable that when the cover plate 4 is disposed by increasing the protruding height of the convex portion 12, no gap is formed around the heat medium pipe 3. Moreover, in this embodiment, although the base member 2 and the cover plate 4 were formed with the aluminum alloy, other materials, such as aluminum and copper, may be sufficient.

  Next, a method for manufacturing the heat transfer plate 1 will be described. The heat transfer plate manufacturing method according to the first embodiment includes a cutting process for forming the base member 2, an insertion process for inserting the heat medium pipe 3 into the concave groove 7 formed in the base member 2, and a lid groove 6. A lid groove closing step of inserting the lid plate 4 into the main plate, a main joining step of moving the welding rotary tool F along the abutting portions J1 and J2 to perform friction stir welding, and friction stirring on the back surface of the base member 2 And a correction process.

(Cutting process)
First, as shown in FIG. 3A, the lid groove 6 is formed in the thick plate member by a known end mill process. Then, a concave groove 7 having a semicircular cross section is formed on the bottom surface 6c of the lid groove 6 by end milling. Thereby, the base member 2 provided with the cover groove 6 and the concave groove 7 opened in the bottom face 6c of the cover groove 6 is formed. In the first embodiment, the base member 2 is formed by cutting, but an extruded shape of an aluminum alloy may be used.

(Insertion process)
Next, as shown in FIG. 3B, the heat medium pipe 3 is inserted into the groove 7. The lower half of the heat medium pipe 3 is in surface contact with the bottom 7 a that forms the lower half of the groove 7.

(Cover groove closing process)
Next, as shown in FIG. 3C, the lid plate 4 is disposed in the lid groove 6 of the base member 2. At this time, the convex portion 12 of the cover plate 4 is inserted into the groove 7, and the upper surface 13 of the cover plate 4 is flush with the surface 2 a of the base member 2. Further, the abutting portions J1 and J2 are formed by the side walls 6a and 6b of the lid groove 6 and the side surfaces 15a and 15b of the lid plate 4.

(Main joining process)
In the main joining step, friction stir welding is performed using the joining rotary tool F along the abutting portions J1 and J2. In the present embodiment, the main joining step includes a first main joining step in which the abutting portion J1 is frictionally stirred and a second main joining step in which the abutting portion J2 is frictionally stirred.

Here, the rotating tool F for bonding used in the main bonding process in the present embodiment and the rotating tool G for correction used in the correcting process described later will be described in detail.
As shown in FIG. 4A, the joining rotary tool F is made of a metal material harder than the base member 2 such as tool steel and has a columnar shoulder portion F1 and a lower end surface F11 of the shoulder portion F1. And an agitating pin (probe) F2 provided in a protruding manner. The size and shape of the joining rotary tool F may be set according to the material, thickness, etc. of the base member 2, but at least the straightening rotary tool G used in the straightening process described later (see FIG. 4B). Larger than).

The lower end surface F11 of the shoulder portion F1 is a portion that plays a role of pressing the plastic fluidized metal and preventing scattering to the surroundings, and is formed in a concave shape in this embodiment. There is no particular limitation on the size of the outer diameter X ₁ of the shoulder portion F1, in the present embodiment is larger than the outer diameter Y ₁ of the shoulder portion G1 orthodontic rotary tool G.

The stirring pin F2 hangs down from the center of the lower end surface F11 of the shoulder portion F1, and is formed into a tapered truncated cone shape in this embodiment. In addition, a stirring blade engraved in a spiral shape is formed on the peripheral surface of the stirring pin F2. There is no particular limitation on the size of the outer diameter of the stirring pin F2, in the present embodiment, the maximum outer diameter of the stirring pin G2 of the maximum outer diameter (upper diameter) X ₂ is straightening rotary tool G (upper end diameter) Y ₂ more, and the minimum outer diameter (bottom diameter) X ₃ is larger than the minimum outer diameter (bottom diameter) Y ₃ of the stirring pin G2. The length L _A of the stirring pin F2 is longer than the length L _B of the stirring pin G2 of the correction rotary tool G (see FIG. 4B).

The thickness t of the base member 2 shown in FIG. 4 (a) is preferably of a length L _A of the stirring pin F2 is three times or more. The thickness t of the base member 2 is preferably at least 1.5 times the outer diameter X ₁ of the shoulder portion F1. According to this setting, since the thickness of the base member 2 can be sufficiently ensured with respect to the size of the joining rotary tool F, it is possible to reduce the warpage that occurs when performing frictional stirring.

  The straightening rotary tool G shown in FIG. 4B is made of a metal material harder than the base member 2 such as tool steel, and protrudes from a cylindrical shoulder portion G1 and a lower end surface G11 of the shoulder portion G1. And a stirring pin (probe) G2.

  The lower end surface G11 of the shoulder portion G1 is formed in a concave shape like the joining rotary tool F. The stirring pin G2 hangs down from the center of the lower end surface G11 of the shoulder portion G1, and is formed into a tapered truncated cone shape in this embodiment. In addition, a stirring blade engraved in a spiral shape is formed on the peripheral surface of the stirring pin G2.

In the first main joining step, friction stir welding is performed along the abutting portion J1 between the base member 2 and the cover plate 4 as shown in FIGS. 5 and 6 (a) and (b).
First, the start position _SM1 is set at an arbitrary position on the surface 2a of the base member 2, and the agitation pin F2 of the welding rotary tool F is pushed (pressed) into the base member 2. In this embodiment, the start position S _M1 is set in the vicinity of the outer edge of the base member 2 and in the vicinity of the abutting portion J1. When a part of the shoulder portion F1 of the joining rotary tool F comes into contact with the surface 2a of the base member 2, the joining rotary tool F is relatively moved toward the start point s1 of the abutting portion J1. Then, as shown in FIG. 6A, when the starting point s1 is reached, the joining rotary tool F is moved as it is along the abutting portion J1 without being detached. In this embodiment, the welding rotary tool F is rotated counterclockwise, and friction stir welding is performed so that the cover plate 4 is positioned on the left side in the traveling direction. When the rotating tool for bonding F is rotated counterclockwise, there is a high possibility that a bonding defect is formed on the right side in the traveling direction. According to the present embodiment, the bonding defect can be located in a portion far from the heat medium pipe 3. Incidentally, when rotating the welding rotary tool F to the right, it is preferable to perform friction stirring so that the cover plate 4 is positioned on the right side in the traveling direction.

When the joining rotary tool F reaches the end point e1 of the abutting portion J1, the joining rotary tool F is moved to the start position S _M1 as it is, and the joining rotary tool F is moved to the end position E _M1 set at an arbitrary position. Let go. The start position S _M1 , the start point s 1, the end position E _M1, and the end point e 1 are not limited to the positions of the present embodiment, but are in the vicinity of the outer edge of the base member 2 and in the vicinity of the abutting portion J 1. Preferably there is.

Next, in the second main joining step, as shown in FIGS. 6B and 6C, the joining rotary tool F is rotated counterclockwise along the abutting portion J <b> 2 between the base member 2 and the cover plate 4. Friction stir welding is performed.
First, the start position _SM2 is set at an arbitrary point h on the surface 2a of the base member 2, and the stirring pin F2 of the welding rotary tool F is pushed into (pressed on) the base member 2. When a part of the shoulder portion F1 of the joining rotary tool F comes into contact with the surface 2a of the base member 2, the joining rotary tool F is relatively moved toward the start point s2 of the abutting portion J2. When the starting point s2 is reached, the joining rotary tool F is moved along the abutting portion J2 as it is without being detached.

After joining rotation tool F reaches the end point e2 of the butting portion J2, a joining rotation tool F as it is moved to the point f side, disengaging the joining rotation tool F at the end position E _M2 set in point f.
The start position S _M2 and the end position E _M2 are not limited to the positions of the present embodiment, but are preferably corners of the outer edge of the base member 2. Thus, if a loophole in the end position E _M2 remaining can be removed by cutting the corner.

  As shown in (c) of FIG. 6, the surface plasticizing region W1 (W1a, W1b) is formed along the abutting portion J1 and the abutting portion J2 by the main joining step. Thereby, the heat medium pipe 3 is sealed by the base member 2 and the cover plate 4. Further, as shown in FIG. 7, in the present embodiment, the joining rotary tool F is pushed to such an extent that the surface plasticizing region W <b> 1 contacts the outer periphery of the heat medium pipe 3. Since the periphery of the heat medium pipe 3 is closed by the convex portion 12 of the cover plate 4 and sealed by the surface plasticization region W1, the airtightness and watertightness of the heat transfer plate 1 can be improved.

  Note that the depth of the surface plasticizing region W1 is not limited to the above-described form. What is necessary is just to set suitably according to the magnitude | size and shape of the cover plate 4. FIG.

  Here, FIGS. 8A and 8B are diagrams showing the main joining process after the heat transfer plate manufacturing method according to the first embodiment, where FIG. 8A is a perspective view and FIG. 8B is a cross-sectional view. Surface plasticization regions W1 and W1 are formed on the surface 2a side of the base member 2 by the main joining process. Since the surface plasticization region W1 shrinks due to thermal contraction, a compressive stress acts from the respective corners of the base member 2 toward the center on the surface 2a side of the base member 2. Thereby, the base member 2 may bend so that the surface 2a side becomes concave. In particular, among the points a to j shown on the surface 2a of the base member 2, at the points a, c, f, and h related to the four corners of the base member 2, the influence of the warp tends to appear remarkably. The point j indicates the center point of the base member 2.

(5) Straightening Step In the straightening step, friction stirring is performed from the back surface 2b of the base member 2 using a relatively small straightening rotary tool G. The straightening process is a process performed to eliminate the warp (deflection) generated in the above-described main joining process. In the present embodiment, the straightening process includes a tab material arranging process for arranging the tab material, and a straightening friction stirring process for performing friction stirring on the back surface 2b of the base member 2.

  In the tab material arranging step, as shown in FIG. 9 (a), after the back surface 2b of the base member 2 is directed upward, the tab material T for setting the start position and the end position of the correction friction stirring step described later is arranged. To do. In this embodiment, the tab material T has a rectangular parallelepiped shape and has a composition equivalent to that of the base member 2. The tab material T is in contact with the side surface 2c so as to cover part of the side surface 2c of the base member 2. Moreover, the tab material T is temporarily joined by welding the both side surfaces of the tab material T and the side surface 2c of the base member 2. The surface of the tab material T is preferably flush with the back surface 2 b of the base member 2.

  In the correction friction agitation step, friction agitation is performed on the back surface 2b of the base member 2 by using the correction rotary tool G as shown in FIGS. 9 (a) and 9 (b). In this embodiment, the route of the straightening friction stirring step is set so as to surround the central point j ′ and the back plasticization region W2 formed by the straightening friction stirring step is radial with respect to the central point j ′. . The points a ′, b ′,... Are points corresponding to the back surface 2 b side of the points a, b,... (See FIG. 8) on the front surface 2 a side of the base member 2.

In the straightening friction stirring step, as shown in FIG. 9A, first, a start position _SM2 is set on the surface of the tab material T, and the stirring pin G2 of the straightening rotary tool G is pushed into the tab material T (pressing). To do). When a part of the shoulder portion G1 of the correction rotary tool G comes into contact with the tab material T, the correction rotary tool G is relatively moved toward the base member 2. And it becomes convex in the vicinity of the point f ′, the point a ′, the point c ′ and the point h ′ on the back surface 2b of the base member 2 and is concave in the vicinity of the point g ′, the point d ′, the point b ′ and the point e ′. Friction stirring is performed by relatively moving the correction rotary tool G so that That is, as shown in FIG. 9B, the back surface plasticized region W2 is formed so as to be symmetric with respect to the center line (dashed line) of the base member 2. In the present embodiment, a start position S _M2 and an end position E _M2 are provided on the tab material T, and friction stirring is performed in the manner of one stroke. Thereby, friction stirring can be performed efficiently. When the straightening friction stirring step is completed, the tab material T is cut off.

  In the present embodiment, the trajectory of the correction rotary tool G, that is, the shape of the back surface plasticized region W2 is formed so as to surround the center point j ′ and to be substantially radial with respect to the center point j ′. However, the present invention is not limited to this. Variations of the movement trajectory of the correction rotating tool G will be described later.

In this embodiment, the length of the trajectory of the correction rotary tool G (the length of the back surface plasticizing region W2) is the sum of the length of the trajectory of the rotating tool F for bonding (the length of the surface plasticizing region W1). ) To be shorter. That is, the processing degree of the correction rotary tool G in the correction process is set to be smaller than the processing degree of the bonding rotary tool F in the main bonding process. Thereby, the flatness of the heat exchanger plate 1 can be improved. The reason for this will be described in Examples. Here, the workability indicates the volume amount of the plasticized region formed by friction stirring.
Further, in the present embodiment, the tab material is disposed in the correction process, but the tab material may not be provided depending on the friction stirring route in the correction friction stirring process.

  According to the manufacturing method according to the present embodiment described above, since the cover plate 4 has the convex portion 12 inserted into the concave groove 7, the gap formed around the heat medium pipe 3 can be reduced. . Further, by forming the bottom surface 12a of the convex portion 12 so as to be in close contact with the outer periphery of the heat medium pipe 3, the gap can be further reduced. Thereby, the heat exchange efficiency of the heat exchanger plate 1 can be improved.

  Further, even if the heat transfer plate 1 is bent due to heat shrinkage in the main joining process, frictional stirring is also performed on the back surface 2b of the base member 2, thereby eliminating the warp generated on the front surface 2a and making the heat transfer plate 1 flat. Can increase the sex. According to the straightening process, the back surface plasticized region W2 formed on the back surface 2b of the base member 2 shrinks due to thermal contraction, so that each corner of the base member 2 is on the back surface 2b side of the heat transfer plate 1 (base member 2). A compressive stress acts from the part side toward the center side. Thereby, the curvature formed by this joining process is eliminated, and the flatness of the heat exchanger plate 1 can be improved. In the straightening process, the movement trajectory of the straightening rotary tool G is set so that the back surface plasticized region W2 is substantially point symmetric in plan view, and therefore can be flattened in a balanced manner.

  Moreover, in the correction process in this embodiment, since the rotation tool G for correction is moved in the way of one-stroke writing, work efficiency can be improved.

[Second Embodiment]
As shown in FIG. 10, the heat transfer plate 31 according to the second embodiment is different from the first embodiment in that the heat medium pipe 33 or the like has a meandering shape in a plan view and the movement locus of the rotating tool in the correction process. . Since the second embodiment is substantially the same as the first embodiment except for the shape of the heat medium pipe 33 and the like and the correction process, detailed description of overlapping portions is omitted.

  The heat transfer plate 31 includes a base member 32, a heat medium pipe 33 inserted into the base member 32, and a lid plate 34 disposed on the heat medium pipe 33. As shown in FIG. 10B, the base member 32 is formed with a cover groove 36 and a groove 37 that is recessed in the bottom surface 36 c of the cover groove 36. The heat medium pipe 33 is disposed in the concave groove 37. The lid plate 34 is disposed in the lid groove 36, and a convex portion 42 formed on the lid plate 34 is inserted around the heat medium pipe 33. A bottom surface 42 a formed in a concave shape on the lower surface of the convex portion 42 is formed to be equivalent to the curvature of the heat medium pipe 33. That is, when the lid plate 34 is disposed in the lid groove 36, the gap around the heat medium pipe 33 is closed by the convex portion 42.

  Further, when the lid plate 34 is disposed in the lid groove 36, the side walls 36a and 36b of the lid groove 36 and the side surfaces 45a and 45b of the lid plate 34 face each other to form the abutting portions J1 and J2.

  The heat transfer plate manufacturing method according to the second embodiment includes a cutting process for forming the base member 32, an insertion process for inserting the heat medium pipe 33 into the concave groove 37 formed in the base member 32, and a lid groove 36. A lid groove closing step for inserting the lid plate 34 into the main body, a main joining step for moving the joining rotary tool F along the abutting portions J1 and J2 to perform friction stir welding, and friction stirring on the back surface of the base member 32. This includes a straightening step and a chamfering step of chamfering the back surface 32b of the base member 32. Since the cutting process, the inserting process, and the lid groove closing process are the same as those in the first embodiment except for the shape of the heat medium pipe 33 and the like, the description thereof is omitted.

(Main joining process)
In the main joining step, as shown in FIG. 11, the joining rotary tool F is moved along the abutting portions J1 and J2, and the friction stir welding is performed. By this joining process, surface plasticized regions W1 and W1 are formed on both sides of the lid plate 34. In the main joining step, a tab material may be used as necessary.

  When the main joining step is finished, as shown in FIG. 11, the surface plasticized regions W1 and W1 formed on the surface 32a of the base member 32 are contracted by heat shrinkage. A compressive stress acts from the corner side toward the center side. Thereby, the base member 32 may bend so that the surface 32a side becomes concave. In particular, among the points a to j shown on the surface 32a of the base member 32, at the points a, c, f, and h related to the four corners of the base member 32, the influence of the warp tends to appear remarkably.

(Correction process)
In the correction process, friction stirring is performed from the back surface 32b of the base member 32 using a relatively small rotating tool G. The straightening process is a process performed to eliminate the warp (deflection) generated in the above-described main joining process. In the present embodiment, the straightening process includes a straightening friction stirring process in which frictional stirring is performed in a radial manner and a corner friction stirring process in which frictional stirring is performed on the corners of the base member 32.

In the straightening friction stirring step, as shown in FIG. 12A, friction stirring is performed so that a plasticized region is formed radially through the central point j ′. That is, on the straight line connecting point a ′ and point h ′, on the straight line connecting point d ′ and point e ′, on the straight line connecting point f ′ and point c ′, and on point g ′ and point b ′. The friction stirring start position (S _M5 , S _M6 , S _M7 , S _M8 ) and the end position (E _M5 , E _M6 , E _M7 , E _M8 ) are set on the connecting line, and the center point from each start position. The friction stir route is set so that the distance to j ′ is equal to the distance from the center point j ′ to each end position.
After setting the friction stir route in the straightening friction stirring step, the straightening rotary tool G is pushed into each start position, and the straightening rotary tool G is moved along each route (straight line). As shown in FIG. 12B, the back surface plasticized regions W41 to W44 formed by the correction friction stirring step are formed to radially spread in eight directions with respect to the central point j ′.

In the corner friction agitation step, as shown in FIG. 12B, friction agitation is intensively performed at the corners of the base member 32 at the points a ′, c ′, f ′ and h ′. Do. The friction stirring start position S _M9 and the end position E _M9 are set on the side 31a that forms the corner of the point a ′, and the turn-back position S _R9 is set on the other side 31b. Then, pushing the orthodontic rotary tool G to the starting position S _M9, after moving toward the folded position S _R9, folded back at the folded position S _R9, disengaging the orthodontic rotary tool G at the end position E _M9. The same process is performed on each corner of the point c ′, the point f ′, and the point h ′. According to the corner friction stirring step, since the correction step can be performed mainly on the corner portion of the base member 32 having a large warp, the flatness of the heat transfer plate 31 can be further improved.

  In this embodiment, the corner friction stirring step is formed so that the trajectory of the correction rotary tool G is perpendicular to the diagonal line at each corner, but is not limited thereto. A route for friction stirring may be set as appropriate in consideration of the degree of warping of the corner. In addition, the back surface plasticization region W45 and the back surface plasticization region W47, and the back surface plasticization region 46 and the back surface plasticization region W48 formed in the corner friction stirring step are formed so as to be symmetric with respect to the center point j ′. It is preferred that Thereby, the curvature of the base member 2 can be eliminated in a balanced manner and the flatness can be improved.

(Chamfering process)
In the chamfering process, the back surface 32b of the base member 32 is chamfered using a known end mill or the like. As shown in FIG. 12B, on the back surface 32b of the base member 32, a hole (not shown) of the correction rotary tool G, a groove (not shown) generated by pushing each rotary tool, a burr, Etc. occur. Therefore, the back surface 32b of the base member 32 can be formed smoothly by performing the chamfering process. In the present embodiment, as shown in FIG. 13, the thickness Ma of the chamfering process is set larger than the thickness Wa of the back surface plasticizing region W42. Thereby, since the back surface plasticization area | regions W41-W44 formed in the back surface 32b of the base member 32 are removed, the uniformity of the property of the base member 32 can be aimed at. Moreover, since the back surface plasticization area | region W42 is not exposed to the back surface 32b, it is suitable also for designability etc.

In the present embodiment, the thickness of the chamfering process is set to be larger than the thickness of the back surface plasticizing region, but the present invention is not limited to this. The thickness of the chamfering process may be set larger than the length of the stirring pin G2 of the correction rotary tool G, for example.
Moreover, in this embodiment, although the correction process was performed using the rotation tool G for correction provided with the stirring pin G2, you may perform the correction process using the rotation tool G for correction that does not include the stirring pin G2. . According to such a rotating tool, since the depth of the back surface plasticization region can be reduced, the thickness to be chamfered can be reduced. Thereby, since there are few chamfering parts, the loss of the base member 32 can be made small and cost can be reduced.

  According to the present embodiment described above, since the cover plate 34 has the convex portion 42 inserted into the concave groove 37, the gap formed around the heat medium pipe 33 can be reduced. Further, by forming the bottom surface 42 a of the convex portion 42 so as to be in close contact with the outer periphery of the heat medium pipe 33, the gap can be reduced. Thereby, the heat exchange efficiency of the heat exchanger plate 31 can be improved.

  Further, even if the heat transfer plate 31 is bent due to heat shrinkage in the main joining process, the warp generated on the surface 32a is eliminated by performing frictional stirring on the back surface 32b of the base member 32. The flatness of 31 can be improved.

  In this embodiment, the length of the trajectory of the correction rotary tool G (the sum of the lengths of the back surface plasticizing region) is equal to the length of the trajectory of the rotating tool F for bonding (the length of the surface plasticizing region W1). It is formed to be shorter than the sum. That is, the processing degree of the correction rotary tool G in the correction process is set to be smaller than the processing degree of the bonding rotary tool F in the main bonding process. Thereby, the flatness of the heat transfer plate 31 can be improved. The reason for this will be described in Examples. The degree of work indicates the volume of the plasticized region formed by friction stirring.

  In the present embodiment, the back surface plasticized regions W41 to W44 and the back surface plasticized regions W45 to W48 formed on the back surface 32b of the base member 32 are formed to be point-symmetric with respect to the center point j. . Thereby, the heat exchanger plate 31 can be corrected with a good balance.

(First modification)
Next, a first modification of the correction process will be described. FIG. 14 is a plan view showing a first modification of the correction process. As shown in FIG. 14, in the correction process according to the first modification, a planar shape substantially equivalent to the surface plasticization regions W <b> 1 and W <b> 1 formed on the surface 32 a side of the base member 32 using the correction rotary tool G. Friction stirring is performed so that Thereby, the sum and shape of the lengths of the back surface plasticized regions W2 and W2 formed on the back surface 32b and the sum and shape of the lengths of the surface plasticized regions W1 and W1 formed on the surface 32a of the base member 32 are It becomes equivalent.

  According to the straightening process according to the first modification, the warp of the heat transfer plate 31 is well balanced by equalizing the length and the planar shape of the plasticized region formed on the front surface 32a and the back surface 32b of the base member 32. It can be corrected. In the straightening process, since the friction stir is performed using the straightening rotary tool G smaller than the joining rotary tool F, the processing amount on the back surface 32b side can be made smaller than the processing amount on the front surface 32a side. it can. Thereby, the flatness of the heat transfer plate 31 can be improved.

  The correction process is not limited to the friction stir route described above, and various routes can be set. Below, the other form of the route of friction stirring which concerns on a correction process is demonstrated.

[Second Modification to Eighth Modification]
The route of the friction stirrer related to the correction process is not limited to the above-described form, and may be the following form. FIG. 15 is a plan view of the back side of the heat transfer plate, where (a) is a second modification, (b) is a third modification, (c) is a fourth modification, and (d) is a fifth modification. For example, (e) shows a sixth modification, and (f) shows a seventh modification. Also in the second modification to the seventh modification, the heat transfer plate can be corrected with a good balance.

  The trajectories (back surface plasticizing region W2) of the correction rotary tool of the second and third modifications shown in FIGS. 15A and 15B all surround the center point j ′ of the base member 32. It is characterized by being formed. The second modification is formed so as to have a similar shape to the shape of the outer edge of the base member 32. Moreover, you may form in a grid | lattice form like the 3rd modification shown in FIG.15 (b).

  The trajectories (back surface plasticization region W2) of the correction rotary tool of the fourth and fifth modifications shown in FIGS. 15C and 15D both pass through the center point j ′ of the base member 2. It is characterized by being formed radially. The fourth modified example shown in FIG. 15C includes a plurality of loops having a center point j as a start point and an end point, and is formed so as to be point-symmetric with respect to the center point j ′. Since the fourth modified example can be formed in the manner of a single stroke, work efficiency can be improved. The fifth modified example shown in FIG. 15D is formed so as to pass through the central point j ′ and to be parallel to the diagonal line of the base member 32.

  The trajectory (back surface plasticization region W2) of the correction rotary tool of the sixth modification and the seventh modification shown in FIGS. 15E and 15F is an area divided by a straight line passing through the central point j ′. Four trajectories having the same shape are formed independently, and trajectories that are diagonally opposed across the central point j ′ are formed to be point-symmetric. The four trajectories may have any shape as long as they have the same shape.

As described above, the movement path of friction stirring in the correction process may be performed by appropriately setting the route of friction stirring according to the path of friction stirring in the main joining process performed on the surface 32a side of the base member 32.
In the description of the present embodiment, the base member 32 has been described as an example of a square in plan view, but may have other shapes.

[Third embodiment]
Next, third to sixth embodiments of the present invention will be described. The heat transfer plate manufacturing method according to the third to sixth embodiments is different from the first embodiment in the shapes of the base member 2 and the cover plate 4 and the main contact process. Detailed description of the same parts as those in the first embodiment will be omitted.

  FIG. 16 is a cross-sectional view showing the main joining process according to the third embodiment. In the heat transfer plate 1 according to the third embodiment, the tips in the depth direction of the surface plasticized regions W1 and W1 formed along the abutting portions J1 and J2 are in contact with the bottom surface 6c of the lid groove 6. This is different from the first embodiment. In the first embodiment, the friction stir is performed so that the surface plasticization region W1 and the heat medium pipe 3 are in contact with each other. However, as in the third embodiment, only the abutting portions J1 and J2 are subjected to the friction stir welding. Also good.

  FIG. 17 is a cross-sectional view showing the main joining step according to the fourth embodiment. The heat transfer plate 1 according to the fourth embodiment is different from the first embodiment in that the width of the lid plate 4 is set larger than that in the first embodiment. In the main joining process according to the fourth embodiment, after the friction stir welding is performed on the abutting portions J1 and J2 using a rotating tool smaller than the joining rotating tool F, the joining is performed from the surface 13 of the cover plate 4. Friction stir welding is performed using the rotary tool F. Surface plasticization regions W1 and W1 are formed on the surface 13 of the cover plate 4. In the surface plasticizing region W1, it is preferable to set the pushing amount of the joining rotary tool F to such an extent that it contacts the heat medium pipe 3. According to this process, even if the width of the cover plate 4 is large, the periphery of the heat medium pipe 3 can be reliably sealed.

  FIG. 18 is a cross-sectional view showing the main joining step according to the fifth embodiment. The heat transfer plate 1 according to the fifth embodiment is different from the first embodiment in that temporary bonding is performed before performing the main bonding step, and the main bonding step is performed from above the plasticized region formed by the temporary bonding. .

  In the heat transfer plate manufacturing method according to the fifth embodiment, prior to the joining step, temporary joining is performed on the abutting portions J1 and J2 using a rotating tool smaller than the joining rotating tool F. Plasticized regions W3 and W4 are formed in the abutting portions J1 and J2. Then, friction stir welding is performed using the welding rotary tool F from above the plasticized regions W3 and W4. According to this manufacturing method, since the friction stir welding can be performed in full scale using the welding rotary tool F with the cover plate 4 temporarily attached to the base member 2, workability can be improved. Further, for example, in the fourth embodiment shown in FIG. 17, surface plasticization regions W1, W1, W3, W4 and four plasticization regions are formed in the heat transfer plate 1, but according to the fifth embodiment, The surface plasticization regions W1, W1 and the two plasticization regions are sufficient. Thereby, the cutting process etc. of the burr | flash formed around the surface plasticization area | region can be reduced.

  FIG. 19 is a cross-sectional view showing the main joining step according to the sixth embodiment. The heat transfer plate 1 according to the sixth embodiment is different from the first embodiment in that gaps P1 and P2 are formed around the heat medium pipe 3 when the cover plate 4 is disposed on the base member 2. To do.

  The cover plate 4 of the heat transfer plate 1 according to the sixth embodiment includes a main body portion 11 and a convex portion 12 protruding from the lower surface of the main body portion 11. On the lower surface of the convex portion 12, a bottom surface 12a formed in a concave shape is formed. The curvature of the bottom surface 12 a is smaller than the curvature of the heat medium pipe 3. Accordingly, as shown in FIG. 19A, when the cover plate 4 is inserted into the cover groove 6, the convex portion 12 of the cover plate 4 is inserted into the concave groove 7. Gaps P1 and P2 are formed.

  In the main joining step according to the sixth embodiment, the friction stir welding is performed by bringing the joining rotary tool F close to the heat medium pipe 3. Thereby, since the plastic fluidized material stirred and fluidized by the joining rotary tool F flows into the gap portions P1 and P2, the gap portions P1 and P2 can be sealed. Therefore, the airtightness and watertightness of the heat transfer plate 1 can be improved.

  Although the embodiments of the present invention have been described above, modifications can be made as appropriate without departing from the spirit of the present invention. For example, in the embodiment, the heat medium pipe or the like is formed in a substantially serpentine shape in a plan view and a substantially horseshoe shape in a plan view, but may have other shapes. Further, the main joining process was performed with the surface 2 a of the base member 2 and the surface 13 of the lid plate 4 being flush with each other. However, when the lid plate 4 was disposed in the lid groove 6, the surface 2 a of the base member 2 You may perform this joining process in the state which made the surface 13 of the cover plate 4 protrude.

  Next, examples of the present invention will be described. In the embodiment according to the present invention, as shown in FIGS. 20A and 20B, friction stir is performed so as to draw three circles on the front surface 2a and the back surface 2b of the base member 2 having a square shape in plan view, The amount of warpage deformation generated on the 2a side and the amount of warpage deformation generated on the back surface 2b side were measured. It shows that the flatness of the base member 2 is high, so that the value of the deformation amount of the curvature which generate | occur | produced in the surface 2a side and the value of the deformation amount of the curvature which generate | occur | produced in the back surface 2b side are near.

  The base member 2 was a rectangular parallelepiped having a plan view of 500 mm × 500 mm, and the measurement was performed using two types of members having a thickness of 30 mm and 60 mm. The material of the base member 2 is JIS standard 5052 aluminum alloy.

  The three circles that are the locus of frictional stirring are centered on the point j or the point j ′ set at the center of the base member 2, and both the surface 2a and the back surface 2b have a radius r1 = 100 mm (hereinafter also referred to as a small circle), It was set to 150 mm (hereinafter also referred to as middle circle) and r3 = 200 mm (hereinafter also referred to as great circle). Friction stirring was performed in the order of small circle, middle circle, and great circle.

  As the rotating tool, the rotating tool having the same size was used on both the front surface 2a side and the back surface 2b side. The size of the rotating tool is such that the outer diameter of the shoulder portion is 20 mm, the length of the stirring pin is 10 mm, the base size (maximum diameter) of the stirring pin is 9 mm, and the tip size (minimum diameter) of the stirring pin is 6 mm. Things were used. The rotational speed of the rotary tool was set to 600 rpm, and the feed rate was set to 300 mm / min. Further, the pressing amount of the rotary tool was set constant on both the front surface 2a side and the back surface 2b side. As shown in FIG. 20, the plasticized regions formed on the surface 2a side are referred to as a plasticized region W21 to a plasticized region W23 from a small circle to a large circle, respectively. Further, the plasticized regions formed on the back surface 2b side are designated as plasticized regions W31 to W33 from the small circle to the great circle. Each measurement result in the said Example is shown in the following Tables 1-4.

  Table 1 is a table showing measured values when the thickness of the base member 2 is 30 mm and frictional stirring is performed from the surface side. “Before FSW” indicates the height difference between the central point j (reference j) and each point (point a to point h) before the friction stir. “After FSW” indicates a difference in height between the reference j and each point after performing frictional stirring of three circles with the reference j being zero. The “surface side deformation amount” indicates a value of (after FSW−before FSW) at each point. The lowermost column of “surface side deformation amount” indicates an average value of the points a to h. Negative values of “before FSW” and “after FSW” mean that they are located below the reference j.

Table 2 shows the case where the plate thickness of the base member 2 is 30 mm, and after frictional stirring of small circles, middle circles and great circles from the front side is performed, frictional stirring is also performed from the back side (correction process). It is the table | surface which showed the measured value. “Before FSW” indicates the height difference between the central point j ′ (reference j ′) and each point (a ′ to h ′) before the friction stir.
As shown in FIG. 20, “FSW1” indicates a difference in height between the reference j ′ and each point after performing frictional stirring of a small circle (radius r1) with the reference j ′ as zero. “Back side deformation amount 1” indicates a value (before FSW1−FSW) at each point. The bottom column of “back side deformation amount 1” indicates an average value of the points a to h.
“FSW2” indicates a difference in height between the reference j ′ and each point after performing frictional stirring of the middle circle (radius r2) in addition to the small circle (radius r1) with the reference j ′ set to zero. ing. “Back side deformation amount 2” indicates a value (before FSW2−FSW) at each point. The bottom column of “back side deformation amount 2” indicates an average value of the points a to h.
“FSW3” is based on the reference j ′ after the frictional stirring of the great circle (radius r3) in addition to the small circle (radius r1) and the middle circle (radius r2) with the reference j ′ set to zero. The height difference from the point is shown. "Back side deformation amount 3" indicates the value of (before FSW3-FSW) at each point. The bottom column of “back side deformation amount 3” indicates an average value of the points a to h.

  Table 3 is a table showing measured values when the plate thickness of the base member 2 is 60 mm and frictional stirring is performed from the surface side. Each item in Table 3 has substantially the same meaning as each item in Table 1.

  Table 4 shows the measured values when the base member 2 has a plate thickness of 60 mm, and after frictional stirring of small circles, middle circles, and great circles from the front surface side and then frictional stirring from the back surface side. It is a table. Each item in Table 4 has substantially the same meaning as each item in Table 2.

  Comparing the average value (1.61) of “front side deformation” in Table 1 and the average value (2.04) of “back side deformation 1” in Table 2, the value of “back side deformation 1” is more large. Similarly, the average value (2.95) of “back side deformation 2” and the average value (3.53) of “back side deformation 3” are larger than the average value (1.61) of “front side deformation”. ing. That is, when the plate thickness of the base member 2 is 30 mm, the warp of the base member 2 is returned too much only by performing a small circle of friction stirring from the back side. Therefore, when the base member 2 is 30 mm, the flatness of the base member 2 can be enhanced with a lower degree of processing than the surface side.

  When the average value (0.98) of “front side deformation amount” in Table 3 is compared with the average value (0.91) of “back side deformation amount 2” in Table 4, the deformation amounts of both are approximated. Therefore, when the plate thickness of the base member 2 was 60 mm, it was confirmed that the flatness of the base member 2 was high when the frictional stirring of the small circle and the middle circle was performed from the back side. That is, when the plate thickness is 60 mm, the flatness of the base member 2 can be improved by setting the processing degree on the back surface side to be lower than that on the front surface side.

DESCRIPTION OF SYMBOLS 1 Heat-transfer plate 2 Base member 3 Heat medium pipe 4 Cover plate 6 Cover groove 6a Cover groove side wall 6b Cover groove side wall 7 Concave groove 12 Convex part 15a Cover plate side face 15b Cover plate side face J1 Butting part J2 Butting part F Rotating tool for bonding G Rotating tool for straightening W1 Surface plasticizing area W2 Back plasticizing area

Claims (13)

An insertion step of inserting the heat medium pipe into the concave groove formed on the bottom surface of the lid groove opening on the surface side of the base member;
A lid groove closing step of inserting a lid plate having a main body portion inserted into the lid groove and a convex portion inserted into the concave groove into the lid groove;
A main joining step of performing friction stir welding by relatively moving the rotary tool along the abutting portion between the side wall of the lid groove and the side surface of the lid plate;
A correction step of moving the rotating tool relative to the back surface of the base member to perform friction stirring;
The manufacturing method of the heat exchanger plate characterized by including.   In the correction step, the volume amount of the plasticized region formed on the back surface of the heat transfer plate is set to be smaller than the volume amount of the plasticized region formed on the surface side of the heat transfer plate. The manufacturing method of the heat exchanger plate of Claim 1.   In the said correction process, the planar shape of the plasticization area | region formed in this correction process is set so that it may become substantially point symmetrical with respect to the center of the said heat exchanger plate. The manufacturing method of the heat-transfer board of description.   4. The correction process according to claim 1, wherein the planar shape of the plasticized region formed in the correction process is set to be substantially similar to the shape of the outer edge of the heat transfer plate. The manufacturing method of the heat exchanger plate as described in any one of Claims.   In the straightening step, the planar shape of the plasticized region formed in the straightening step is set to be substantially the same shape as the planar shape of the plasticized region formed on the surface side of the heat transfer plate. The manufacturing method of the heat exchanger plate as described in any one of Claim 1 thru | or 4. In the straightening step, the total length of the plasticized region formed in the straightening step is set to be equal to the total length of the plasticized region formed on the surface side of the heat transfer plate. The manufacturing method of the heat exchanger plate as described in any one of Claim 1 thru | or 5.   In the straightening step, the total length of the plasticized region formed in the straightening step is set to be shorter than the total length of the plasticized region formed on the surface side of the heat transfer plate. The manufacturing method of the heat exchanger plate as described in any one of Claim 1 thru | or 4.   The outer diameter of the shoulder part of the rotary tool used in the straightening process is set smaller than the outer diameter of the shoulder part of the rotary tool used in the main joining process. The manufacturing method of the heat exchanger plate as described in one term.   The length of the stirring pin of the rotary tool used in the straightening process is set to be smaller than the length of the stirring pin of the rotary tool used in the main joining process. The manufacturing method of the heat exchanger plate as described in a term.   The thickness of the said base member is set to 1.5 times or more of the outer diameter of the shoulder part of the said rotary tool used at the said main joining process, The Claim 1 thru | or 9 characterized by the above-mentioned. Manufacturing method of heat transfer plate.   The thickness of the said base member is set to 3 times or more of the length of the stirring pin of the said rotation tool used at the said main joining process, The transmission as described in any one of Claim 1 thru | or 10 characterized by the above-mentioned. Manufacturing method of hot plate.   When the base member has a polygonal shape in plan view, the straightening step includes a corner friction stirring step of performing friction stirring on a corner portion of the heat transfer plate using a rotary tool. The manufacturing method of the heat exchanger plate as described in any one of Claim 1 thru | or 11. After the straightening step, a chamfering step of chamfering the back side of the heat transfer plate is included, and the depth of the chamfering step is larger than the length of the stirring pin of the rotary tool used in the straightening step. The manufacturing method of the heat exchanger plate as described in any one of Claims 1 thru | or 12 characterized by the above-mentioned.

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