JP2021087961A - Method of manufacturing heat exchanger plate - Google Patents

Abstract

To decrease occurrences of burrs, and suppress frictional heating generated when pushing-in or detaching a rotary tool, in order to perform welding properly.SOLUTION: After inserting a rotational tip side pin F3 into a start position set on a surface 2a of a base member 2, the tip side pin F3 is gradually pushed-in until reaching a predetermined depth, while moving a rotational center axis of a rotary tool F to a position overlapped with an abutting part. When relatively moving the rotary tool F along the abutting part, a plastic flow material formed by frictional agitation is pushed-in and filling a space by using an outer peripheral surface of a base end side pin F2, while bringing the outer peripheral surface of the base end side pin F2 into contact with the surface 2a of the base member 2 and a surface 5a of a lid plate 5.SELECTED DRAWING: Figure 11

Description

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

A method for manufacturing a heat transfer plate using friction stir welding is known. For example, in the method for manufacturing a heat transfer plate of Patent Document 1, a temporary joining step of performing spot temporary attachment by welding along a butt portion between a side wall of a lid groove of a base member and a side surface of the lid plate, and along the butt portion. This joining step is performed by relatively moving a rotating tool equipped with a stirring pin to perform frictional stirring.

JP-A-2018-108594

In friction stir welding, the rotary tool is moved in the vertical direction when the rotary tool is pushed into the metal member to be joined at the start position set on the butt section or when it is released from the end position set on the butt section. Therefore, the frictional heat at the start position or the end position becomes excessive. As a result, poor joining may occur. Further, in friction stir welding, it is desired to reduce the occurrence of burrs.

Therefore, it is an object of the present invention to provide a method for manufacturing a heat transfer plate capable of reducing the occurrence of burrs and suppressing the frictional heat generated when the rotating tool is pushed in or out and joining them appropriately. To do.

In order to solve such a problem, in the present invention, the lid plate is inserted into the lid groove formed around the concave groove that opens on the surface of the base member, and the side wall of the lid groove and the side surface of the lid plate are connected to each other. The lid plate insertion step of forming the butt portion while providing a gap between them, and the rotation tool provided with the base end side pin and the tip end side pin are relatively moved along the butt portion to frictionally stir the butt portion. The taper angle of the base end side pin is larger than the taper angle of the tip end side pin, and a stepped step portion is formed on the outer peripheral surface of the base end side pin. It is formed, and in the main joining step, after the rotating tip side pin is inserted into the start position set on the surface of the base member, the rotation center axis of the rotation tool is moved to a position overlapping the butt portion. When the tip end side pin is gradually pushed in until it reaches a predetermined depth and the rotation tool is relatively moved along the abutting portion, the outer peripheral surface of the base end side pin, the surface of the base member, and the lid are used. It is characterized in that the plastic fluid material generated by frictional stirring is pushed into the gap by the outer peripheral surface of the base end side pin while being in contact with the surface of the plate.

Further, in the present invention, the lid plate is inserted into the lid groove formed around the concave groove that opens on the surface of the base member, and the lid plate is butted while providing a gap between the side wall of the lid groove and the side surface of the lid plate. A lid plate inserting step of forming a portion, and a main joining step of frictionally stirring the butt portion by relatively moving a rotation tool having a base end side pin and a tip end side pin along the butt portion. The taper angle of the base end side pin is larger than the taper angle of the tip end side pin, and a stepped step portion is formed on the outer peripheral surface of the base end side pin. In the joining step, the tip side pin is inserted from the start position set on the butt portion, and the tip side pin is gradually pushed in until it reaches a predetermined depth while moving in the traveling direction, and along the butt portion. When the rotary tool is relatively moved, the plastic fluid material generated by frictional stirring is brought into contact with the outer peripheral surface of the base end side pin, the surface of the base member, and the surface of the lid plate of the base end side pin. It is characterized in that the gap is pushed and filled by the outer peripheral surface.

Further, in the present invention, the lid plate is inserted into the lid groove formed around the concave groove that opens on the surface of the base member, and the lid plate is butted while providing a gap between the side wall of the lid groove and the side surface of the lid plate. A lid plate insertion step of forming a portion, and a main joining step of frictionally agitating the butt portion by relatively moving a rotation tool having a base end side pin and a tip end side pin along the butt portion. The taper angle of the base end side pin is larger than the taper angle of the tip end side pin, and a stepped step portion is formed on the outer peripheral surface of the base end side pin. In the joining step, when the rotating tool is relatively moved along the butt portion, it is generated by friction stir welding while bringing the outer peripheral surface of the base end side pin into contact with the surface of the base member and the surface of the lid plate. The plastic fluid material is pushed into the gap by the outer peripheral surface of the base end side pin to fill the gap, an end position is set on the surface of the base member, friction stir welding is performed on the butt portion, and then the rotation tool is moved to the end position. The tip side pin is gradually pulled out from the base member while being moved, and the rotating tool is separated from the base member at the end position.

Further, in the present invention, the lid plate is inserted into the lid groove formed around the concave groove that opens on the surface of the base member, and the lid plate is butted while providing a gap between the side wall of the lid groove and the side surface of the lid plate. A lid plate insertion step of forming a portion, and a main joining step of frictionally agitating the butt portion by relatively moving a rotation tool having a base end side pin and a tip end side pin along the butt portion. The taper angle of the base end side pin is larger than the taper angle of the tip end side pin, and a stepped step portion is formed on the outer peripheral surface of the base end side pin. In the joining step, when the rotating tool is relatively moved along the butt portion, it is generated by friction stir welding while bringing the outer peripheral surface of the base end side pin into contact with the surface of the base member and the surface of the lid plate. The plastic fluid material is pushed into the gap by the outer peripheral surface of the base end side pin to fill the gap, an end position is set on the butt portion, and after friction stir welding with the butt portion, the rotation tool is moved to the end position. The tip side pin is gradually pulled out from the base member and the lid plate, and the rotating tool is separated from the base member and the lid plate at the end position.

According to such a manufacturing method, the rotary tool is moved to a position overlapping the butt portion and the tip side pin is gradually pushed in until it reaches a predetermined depth, thereby preventing the frictional heat from becoming excessive on the butt portion. be able to. Further, by gradually pushing the tip side pin until it reaches a predetermined depth while moving the rotation tool on the butt portion, it is possible to prevent the frictional heat from becoming excessive at one point on the butt portion. Further, by gradually pulling out the tip side pin from a predetermined depth while moving the rotation tool to the end position, it is possible to prevent the frictional heat from becoming excessive on the butt portion. Further, by gradually pulling out the tip side pin from a predetermined depth while moving the rotation tool on the butt portion, it is possible to prevent the frictional heat from becoming excessive at one point on the butt portion. Further, since the plastic fluid material can be pressed on the outer peripheral surface of the base end side pin, the occurrence of burrs can be reduced.

Further, it is preferable to include a heat medium tube inserting step of inserting the heat medium tube into the concave groove before the lid plate inserting step. According to such a manufacturing method, a heat transfer plate provided with a heat medium tube can be easily manufactured.

Further, in the main joining step, when the rotating tool is relatively moved along the butt portion, it is preferable that the flat surface of the tip end side pin is in contact with the bottom surface of the lid groove. According to such a manufacturing method, the joint strength between the base member and the lid plate can be improved.

Further, it is preferable to include a temporary joining step of temporarily joining the butt joints before the main joining step. According to such a manufacturing method, it is possible to prevent the base member and the lid plate from being displaced in the main joining process and the opening between the base member and the lid plate.

Further, in the temporary joining step, the rotary tool used for friction stir welding includes a proximal end side pin and a distal end side pin, and the taper angle of the proximal end side pin is larger than the taper angle of the distal end side pin. A stepped step portion is formed on the outer peripheral surface of the base end side pin, and friction stir welding is performed in a state where the outer peripheral surface of the base end side pin is in contact with the surface of the base member and the surface of the lid plate. Is preferable.

According to such a manufacturing method, since the base member and the lid plate can be pressed by the outer peripheral surface of the base end side pin having a large taper angle, the occurrence of burrs can be reduced and the bonding can be preferably performed.

According to the method for manufacturing a heat transfer plate according to the present invention, it is possible to reduce the generation of burrs and suppress the frictional heat generated when the rotating tool is pushed in or out, and to join the heat transfer plate preferably.

It is a side view which shows the rotation tool for this joining used in the joining method which concerns on embodiment of this invention. It is an enlarged sectional view of the rotation tool for this joining. It is sectional drawing which shows the 1st modification of this rotary tool for joining. It is sectional drawing which shows the 2nd modification of this rotary tool for joining. It is sectional drawing which shows the 3rd modification of this rotary tool for joining. It is a perspective view which shows the heat transfer plate which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the manufacturing method of the heat transfer plate which concerns on 1st Embodiment, and shows the preparation process. It is sectional drawing which shows the manufacturing method of the heat transfer plate which concerns on 1st Embodiment, and shows the lid plate insertion process. It is sectional drawing which shows the manufacturing method of the heat transfer plate which concerns on 1st Embodiment, and shows the temporary joining process. It is a top view which shows the manufacturing method of the heat transfer plate which concerns on 1st Embodiment, and shows the state which the temporary joining process is completed. It is a side sectional view which shows the manufacturing method of the heat transfer plate which concerns on 1st Embodiment, and shows the start position of this joining process. It is sectional drawing which shows the manufacturing method of the heat transfer plate which concerns on 1st Embodiment, and shows this joining process. It is a side sectional view which shows the manufacturing method of the heat transfer plate which concerns on 1st Embodiment, and shows the end position of this joining process. It is sectional drawing which shows the manufacturing method of the heat transfer plate which concerns on the modification of 1st Embodiment, and shows the state in which this joining process is completed. It is sectional drawing which shows the manufacturing method of the heat transfer plate which concerns on 2nd Embodiment, and shows the preparation process. It is sectional drawing which shows the manufacturing method of the heat transfer plate which concerns on 2nd Embodiment, and shows the lid plate insertion process. It is sectional drawing which shows the manufacturing method of the heat transfer plate which concerns on 2nd Embodiment, and shows this joining process.

Embodiments of the present invention will be described with reference to the drawings as appropriate. First, the main joining rotation tool (rotation tool) F used in the joining method in the embodiment of the present invention will be described. The rotary tool F for main joining is a tool used for friction stir welding. As shown in FIG. 1, the rotary tool F for main joining is formed of, for example, tool steel, and is mainly composed of a base shaft portion F1, a base end side pin F2, and a tip end side pin F3. The base shaft portion F1 has a columnar shape and is a portion connected to the main shaft of the friction stir welder.

The base end side pin F2 is continuous with the base shaft portion F1 and is tapered toward the tip end. The proximal end side pin F2 has a truncated cone shape. The taper angle A of the base end side pin F2 may be appropriately set, and is, for example, 135 to 160 °. If the taper angle A is less than 135 ° or exceeds 160 °, the joint surface roughness after friction stir welding becomes large. The taper angle A is larger than the taper angle B of the tip side pin F3, which will be described later. As shown in FIG. 2, a stepped pin step portion F21 is formed on the outer peripheral surface of the base end side pin F2 over the entire height direction. The pin step portion F21 is formed in a spiral shape in a clockwise or counterclockwise direction. That is, the pin step portion F21 has a spiral shape when viewed in a plane and a step shape when viewed from a side surface. In the present embodiment, in order to rotate the main joint rotation tool F clockwise, the pin step portion F21 is set counterclockwise from the base end side to the tip end side.

When the rotation tool F for main joining is rotated counterclockwise, it is preferable to set the pin step portion F21 clockwise from the base end side to the tip end side. As a result, the plastic fluid material is guided to the tip side by the pin step portion F21, so that the metal overflowing to the outside of the metal member to be joined can be reduced. The pin step portion F21 is composed of a step bottom surface F21a and a step side surface F21b. The distance X1 (horizontal distance) between the vertices F21c and F21c of the adjacent pin step portions F21 is appropriately set according to the step angle C and the height Y1 of the step side surface F21b described later.

The height Y1 of the step side surface F21b may be appropriately set, and is set to, for example, 0.1 to 0.4 mm. If the height Y1 is less than 0.1 mm, the joint surface roughness becomes large. On the other hand, when the height Y1 exceeds 0.4 mm, the joint surface roughness tends to increase, and the number of effective step portions (the number of pin step portions F21 in contact with the metal member to be joined) also decreases.

The step angle C formed by the step bottom surface F21a and the step side surface F21b may be appropriately set, but is set to, for example, 85 to 120 °. The step bottom surface F21a is parallel to the horizontal plane in this embodiment. The step bottom surface F21a may be inclined in the range of -5 ° to 15 ° with respect to the horizontal plane from the rotation axis of the tool toward the outer peripheral direction (minus is downward with respect to the horizontal plane, plus is with respect to the horizontal plane). Above). The distance X1, the height Y1 of the step side surface F21b, the step angle C, and the angle of the step bottom surface F21a with respect to the horizontal plane are such that the plastic fluid does not stay inside the pin step portion F21 and adhere to the outside during friction stir welding. The surface roughness of the joint is appropriately set so that the plastic fluid material can be pressed by the step bottom surface F21a to reduce the roughness of the joint surface.

As shown in FIG. 1, the distal end side pin F3 is continuously formed on the proximal end side pin F2. The tip side pin F3 has a truncated cone shape. The tip of the tip side pin F3 is a flat surface F4. The flat surface F4 is perpendicular to the rotation axis of the tool. The taper angle B of the tip end side pin F3 is smaller than the taper angle A of the base end side pin F2. As shown in FIG. 2, a spiral groove F31 is engraved on the outer peripheral surface of the tip end side pin F3. The spiral groove F31 may be clockwise or counterclockwise, but in the present embodiment, the spiral groove F31 is carved counterclockwise from the base end side to the tip end side in order to rotate the main joint rotation tool F clockwise.

When the rotation tool F for main joining is rotated counterclockwise, it is preferable to set the spiral groove F31 clockwise from the base end side to the tip end side. As a result, the plastic fluid material is guided to the tip side by the spiral groove F31, so that the metal overflowing to the outside of the metal member to be joined can be reduced. The spiral groove F31 is composed of a spiral bottom surface F31a and a spiral side surface F31b. The distance (horizontal distance) between the vertices F31c and F31c of the adjacent spiral grooves F31 is defined as the length X2. The height of the spiral side surface F31b is defined as the height Y2. The spiral angle D composed of the spiral bottom surface F31a and the spiral side surface F31b is formed at, for example, 45 to 90 °. The spiral groove F31 has a role of increasing frictional heat by coming into contact with the metal member to be joined and guiding the plastic fluid material to the tip side.

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

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

FIG. 5 is a side view showing a third modification of the rotary tool for joining of the present invention. As shown in FIG. 5, in the main joint rotation tool FC according to the third modification, the step bottom surface F21a is inclined 10 ° upward with respect to the horizontal plane from the rotation axis of the tool toward the outer peripheral direction. The step side surface F21b is parallel to the vertical surface. As described above, the step bottom surface F21a may be formed so as to be inclined upward from the horizontal plane from the rotation axis of the tool toward the outer peripheral direction within a range in which the plastic fluid material can be pressed during friction stir welding. The same effect as that of the following embodiment can be obtained by the first to third modifications of the above-mentioned rotary tool for joining.

[First Embodiment]
Next, the heat transfer plate 1 of the first embodiment will be described. In the following description, the "front surface" means the surface opposite to the "back surface". As shown in FIG. 6, the heat transfer plate 1 according to the present embodiment is mainly composed of a base member 2 and a lid plate 5. The base member 2 exhibits a substantially rectangular parallelepiped. The base member 2 is formed with a concave groove 3 and a lid groove 4. The materials of the base member 2 and the lid plate 5 are not particularly limited as long as they can be frictionally agitated, but are aluminum alloys in this embodiment.

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

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

The lid plate 5 is a plate-shaped member inserted into the lid groove 4. The base member 2 and the lid plate 5 are integrated by friction stir welding. The space surrounded by the concave groove 3 of the heat transfer plate 1 and the lower surface of the lid plate 5 serves as a flow path for the fluid to flow.

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

As shown in FIGS. 7A and 7B, the preparation step is a step of preparing the base member 2 and the lid plate 5. The base member 2 may be formed by cutting the concave groove 3 and the lid groove 4 using an end mill or the like, or the base member 2 in which the concave groove 3 and the lid groove 4 are formed in advance by die casting, extrusion molding, or the like. May be used. The lid plate 5 can be molded, for example, by extrusion molding.

As shown in FIG. 7B, the lid plate inserting step is a step of inserting the lid plate 5 into the lid groove 4. The pair of side walls of the lid groove 4 and the pair of side surfaces of the lid plate 5 are abutted to form the abutting portions J1 and J2, respectively. A fine gap is formed in the butt portions J1 and J2. Hereinafter, even when a minute gap is formed between the two abutted surfaces as in the abutting portions J1 and J2, the term "butting portion" is referred to. The width of the gap may be appropriately set, but is, for example, about 0.1 mm to 1.0 mm. The surface 5a of the lid plate 5 and the surface 2a of the base member 2 are flush with each other. The surface 2a of the base member 2 is distinguished by referring to one side in the width direction as "surface 2a1" and the other side as "surface 2a2" as necessary.

As shown in FIGS. 8 and 9, the temporary joining step is a step of preliminarily performing friction stir welding with the butt portions J1 and J2 using the temporary joining rotary tool FD. The temporary joining rotation tool FD has the same configuration as the main joining rotation tool F, and includes a base shaft portion F1D, a base end side pin F2D, and a tip end side pin F3D. The temporary joining rotation tool FD is smaller than the main joining rotation tool F.

In the temporary joining step, a start position is set on one side of the butt portion J1 in the extension direction, and an end position is set on the other side in the extension direction, and friction stir welding of the butt portion J1 is performed. In the temporary joining step, friction stir welding is performed in a state where the outer peripheral surface of the base end side pin F2D is in contact with the surface 2a of the base member 2 and the surface 5a of the lid plate 5. A plasticized region W1 is formed in the movement locus of the temporary joining rotation tool FD. Temporary joining is performed for the butt portion J2 in the same manner.

The temporary joining may be continuously performed on the butt portions J1 and J2, or may be performed intermittently. Further, at the start position, the temporary joining rotation tool FD may be gradually pushed in while being moved. Further, at the end position, the temporary joining rotation tool FD may be gradually pulled out while being moved. Further, the start position and the end position of the temporary joining process may be set on the surface 2a of the base member 2.

The main joining step is a step of performing friction stir welding to the butt portions J1 and J2 by using the main joining rotary tool F. As shown in FIG. 9, in the main joining step, the intrusion section from the start position SP1 to the intermediate point S1 on the butt portion J1, the main section from the intermediate point S1 to the intermediate point S2, and the intermediate point S2 to the end position EP1. The three sections of the detachment section up to are continuously rubbed and agitated. The start position SP1 is set at a position on the surface 2a1 of the base member 2 that is separated from the butt portion J1. In the present embodiment, the angle formed by the line segment connecting the start position SP1 and the intermediate point S1 and the butt portion J1 is set to an obtuse angle.

In the closet section of the main joining step, as shown in FIG. 10, friction stir welding is performed from the start position SP1 to the intermediate point S1. In the closet section, the tip side pin F3 rotated clockwise is inserted into the start position SP1 and moved to the intermediate point S1. At this time, as shown in FIG. 10, the tip side pin F3 is gradually pushed in so as to reach a preset "predetermined depth" by at least reaching the intermediate point S1. That is, the main joint rotation tool F is gradually lowered while being moved to the butt portion J1 without staying at one place.

When the intermediate point S1 is reached, the process proceeds to friction stir welding in this section as it is. As shown in FIGS. 10 and 11, in this section, the main joint rotation tool F is moved so that the rotation center axis of the tip side pin F3 and the butt portion J1 overlap. The "predetermined depth" refers to the depth at which the tip end side pin F3 is inserted in this section of the butt portion J1. In this section, the "predetermined depth" of the tip side pin F3 is set so that the flat surface F4 of the tip side pin F3 reaches the bottom surface 4a of the lid groove 4. The "predetermined depth" of the tip-side pin F3 may be set as appropriate, and may be set so that the tip-side pin F3 does not reach the bottom surface 4a, for example.

As shown in FIGS. 9 and 12, when the rotary tool F for main joining reaches the intermediate point S2, the process shifts to the detachment section as it is. In the detachment section, as shown in FIG. 12, the tip side pin F3 is gradually moved upward from the intermediate point S2 toward the end position EP1, and the tip side pin F3 is moved from the base member 2 to the tip side pin F3 at the end position EP1. Let go. That is, the main joint rotation tool F is gradually pulled out (raised) while being moved to the end position EP1 without staying in one place. The end position EP1 of the present embodiment is set at a position where the angle formed by the line segment connecting the end position EP1 and the intermediate point S2 and the butt portion J1 is an obtuse angle. A plasticized region W1 is formed in the movement locus of the rotary tool F for joining.

In this joining step, the start position SP2, the end position EP2, and the intermediate points S1 and S2 are set for the butt portion J2, and friction stir welding is performed in the same manner as the butt portion J1.

According to the heat transfer plate manufacturing method according to the present embodiment described above, in the indentation section of the main joining step, the main joining rotary tool F is moved from the start positions SP1 and SP2 to the position overlapping the butt portions J1 and J2. By gradually pushing the tip side pin F3 until the depth reaches a predetermined depth, it is possible to prevent the frictional heat from becoming excessive on the butt portions J1 and J2.

Similarly, in the detachment section of the main joining step, the tip side pin F3 is gradually raised from a predetermined depth while moving the main joining rotation tool F from the position overlapping the butt portions J1 and J2 to the end positions EP1 and EP2. By letting it separate, it is possible to prevent the frictional heat from becoming excessive on the butt portions J1 and J2. By preventing the frictional heat from becoming excessive on the butt portions J1 and J2 in this way, it is possible to prevent poor joining of the butt portions J1 and J2.

Further, in the conventional method of manufacturing a heat transfer plate, a tab material is separately provided at the end of the base member, and the start position and the end position of the rotation tool are set to the tab material. However, according to the present embodiment, since the tab material is not required, the number of parts can be reduced and the man-hours can be reduced.

Further, in the main joining step according to the present embodiment, since friction stir welding is performed in a state where the outer peripheral surface of the base end side pin F2 is in contact with the surface 2a of the base member 2 and the surface 5a of the lid plate 5, burrs are generated. Can be reduced. Further, since the plastic fluid material can be pressed on the outer peripheral surface of the base end side pin F2, the stepped groove formed on the joint surface (the surface 2a of the base member 2 and the surface 5a of the lid plate 5) can be reduced. At the same time, the bulging portion formed on the side of the stepped concave groove can be eliminated or reduced. Further, since the stepped pin step portion F21 of the base end side pin F2 is shallow and the outlet is wide, the plastic fluid material can be easily pulled out to the outside of the pin step portion F21 while pressing the plastic fluid material with the step bottom surface F21a. There is. Therefore, even if the plastic fluid material is pressed by the base end side pin F2, the plastic fluid material is unlikely to adhere to the outer peripheral surface of the base end side pin F2. Therefore, the roughness of the joint surface can be reduced, and the joint quality can be suitably stabilized.

Further, in this joining step, friction stir welding is performed while pressing the surface 2a of the base member 2 and the surface 5a of the lid plate 5 on the outer peripheral surface of the base end side pin F2, so that the joint portion is prevented from running out of metal. , The plastic fluid material can be pushed and filled in the gaps between the butt portions J1 and J2. In other words, even when a gap is provided in the butt portions J1 and J2 as in the main joining step, the butt portions J1 and J2 can be reliably filled with the plastic fluid material. As a result, the lid groove 4 and the lid plate 5 of the base member 2 can be suitably joined even if the molding accuracy is not high.

Further, in this joining step, the joining strength between the base member 2 and the lid plate 5 can be increased by setting the flat surface F4 of the tip side pin F3 so as to reach the bottom surface 4a of the lid groove 4.

Further, by performing the temporary joining step, it is possible to prevent the base member 2 and the lid plate 5 from being misaligned and the butt portions J1 and J2 from being opened in the main joining step. Further, the temporary joining step may be performed by welding or another rotating tool may be used, but the outer peripheral surface of the base end side pin FD2 of the temporary joining rotating tool FD is used as the surface 2a of the base member 2 and the lid. The generation of burrs can be suppressed by performing friction stir welding in a state of being in contact with the surface 5a of the plate 5.

In the temporary joining step as well, the temporary joining rotary tool FD may be gradually pushed in while moving at the start position. Further, also in the temporary joining step, the temporary joining rotation tool FD may be gradually separated while being moved at the end position.

Further, in the main joining step, the positions of the start positions SP1 and SP2 may be appropriately set, but by setting the angle formed by the start positions SP1 and SP2 and the butt portions J1 and J2 to be obtuse, the intermediate point is formed. In S1 and S2, it is possible to smoothly shift to the main section without reducing the moving speed of the main joining rotation tool F. As a result, it is possible to prevent the frictional heat from becoming excessive due to the main joint rotation tool F stopping or the moving speed decreasing on the butt portions J1 and J2. Further, by setting the end positions EP1 and EP2 in the same manner as the start positions SP1 and SP2, the rotation tool F for main joining can be smoothly moved from the main section to the departure section.

In the main joining step, the rotation speed of the main joining rotation tool F may be constant, but may be changed. In the indentation section of the main joining process, assuming that the rotation speed of the main joining rotation tool F at the start position SP1 is V1 and the rotation speed of the main joining rotation tool F between the intermediate points S1 to S2 is V2, V1> V2 Good. The rotation speed V2 is a preset constant rotation speed in the butt portions J1 and J2. That is, at the start positions SP1 and SP2, the rotation speed may be set high, and the rotation speed may be gradually reduced in the closet section to shift to the main section.

Further, in the detachment section of the main joining step, the rotation speed of the main joining rotation tool F between the intermediate points S1 and S2 is V2, and the rotation speed of the main joining rotation tool F when the main joining rotation tool F is detached at the end position EP1 is V3. , V3> V2. That is, after shifting to the detachment section, the main joining rotation tool F may be detached while gradually increasing the rotation speed toward the end positions EP1 and EP2. When the rotary tool F for joining is pushed into or detached from the metal member to be welded, by setting as described above, a small pressing force in the indentation section or the detachment section can be compensated by the rotation speed. Friction stir welding can be preferably performed.

[Modified example of the first embodiment]
Next, a method for manufacturing a heat transfer plate according to a modified example of the first embodiment of the present invention will be described. As shown in FIG. 13, in the method of manufacturing the heat transfer plate of the modified example of the first embodiment, in the friction stir welding of the butt portion J2 in the main joining step, the positions of the start position SP2 and the end position EP2 are both butt portions J2. It differs from the first embodiment in that it is set above. In the modified example of the first embodiment, the parts different from the first embodiment will be mainly described.

In the method for manufacturing a heat transfer plate according to a modified example of the first embodiment, a preparation step, a mounting step, and a main joining step are performed. The preparation step and the placement step are the same as those in the first embodiment.

Friction stir welding of the butt portion J1 in this joining step is performed in the same manner as in the first embodiment. In the modified example of the first embodiment, in the friction stir welding of the butt portion J2, the start position SP2 and the end position EP2 are set on the butt portion J2 as shown in FIG. In this joining step, there are three intrusion sections from the start position SP2 to the intermediate point S1, the main section from the intermediate point S1 to the intermediate point S2 on the butt portion J2, and the detachment section from the intermediate point S2 to the end position EP2. The section is continuously frictionally stirred so that the rotation center axis of the tip side pin F3 and the butt portion J2 overlap.

In the closet section, as shown in FIG. 13, friction stir welding is performed from the start position SP2 to the intermediate point S1. In the closet section, the tip side pin F3 rotated clockwise is inserted into the start position SP2 on the butt portion J2 and moved to the intermediate point S1. At this time, the tip side pin F3 is gradually pushed in so as to reach a preset "predetermined depth" by at least reaching the intermediate point S1. That is, the rotary tool F for main joining is not stayed at one place, but is gradually lowered while being moved on the butt portion J2. When the intermediate point S1 is reached, the process shifts to friction stir welding in this section as it is, and the rotation tool F for main joining is moved on the butt portion J2. The predetermined depth is the same as that of the first embodiment.

As shown in FIG. 13, when the main joint rotation tool F reaches the intermediate point S2, the process shifts to the detachment section as it is. In the detachment section, the tip side pin F3 is gradually moved upward from a predetermined depth between the intermediate point S2 and the end position EP2 on the butt portion J2, and the tip side from the base member 2 at the end position EP2. Detach pin F3. That is, the main joint rotation tool F is gradually pulled out while being moved on the butt portion J2 without staying in one place.

The modified example of the first embodiment described above can also achieve substantially the same effect as that of the first embodiment. Further, by gradually pushing the tip side pin F3 until it reaches a predetermined depth while moving the rotary tool F for main joining on the butt portion J2, the frictional heat becomes excessive at one point on the butt portion J2. Can be prevented. Further, by gradually pulling out the tip side pin F3 from a predetermined depth while moving the rotary tool F for main joining on the butt portion J2, it is possible to prevent the frictional heat from becoming excessive at one point on the butt portion J2. Can be done. Further, since the plastic fluid material can be pressed on the outer peripheral surface of the base end side pin F2, the occurrence of burrs can be reduced.

Further, if the start position SP2 and the end position EP2 are set on the butt portion J2 as in the modified example of the first embodiment, the plasticized region W remaining on the surface 2a2 can be reduced. In the modified example of the first embodiment, the start position SP1 and the end position EP1 may be set on the butt portion J1 also in the friction stir welding of the butt portion J1.

[Second Embodiment]
Next, a method for manufacturing the heat transfer plate according to the second embodiment of the present invention will be described. The heat transfer plate 1B of the present embodiment is different from the heat transfer plate 1 of the first embodiment in that it includes a heat medium tube 6. The heat medium tube 6 is a member through which a fluid flows.

In the method for manufacturing a heat transfer plate according to the present embodiment, a preparation step, a tube insertion step for a heat medium, a lid plate insertion step, a temporary joining step, and a main joining step are performed. The preparation step, the lid plate insertion step, the temporary joining step, and the main joining step of the present embodiment are the same as those of the first embodiment. The manufacturing method of this embodiment is different from that of the first embodiment in that a tube insertion step for a heat medium is performed. In this embodiment, the parts different from the first embodiment will be mainly described.

As shown in FIG. 14B, the heat medium tube inserting step is a step of inserting the heat medium tube 6 into the concave groove 3 of the base member 2 (see FIG. 14A) prepared in the preparatory step. The sizes of the recessed groove 3 and the heat medium tube 6 may be appropriately set, but in the present embodiment, the outer diameter of the heat medium tube 6 and the width and depth of the recessed groove 3 are substantially the same. There is.

When the lid plate 5 is inserted into the lid groove 4 in the lid plate inserting step of the present embodiment, the gap portion Q as shown in FIG. 14B is formed by the concave groove 3, the lower surface of the lid plate 5, and the heat medium tube 6. To. When the gap Q is formed in this way, the gap Q may be filled as shown in FIG. 15 by this joining step. By narrowing the widths of the lid groove 4 and the lid plate 5, the positions of the butt portions J1 and J2 are brought close to the heat medium tube 6 and the gap portion Q, and are formed by the main joining rotary tool F in the main joining step. The plastic fluid material is allowed to flow into the gap Q. At this time, since friction stir welding is performed while pressing the surfaces 2a1 and 2a2 of the base member 2 and the surface 5a of the lid plate 5 on the outer peripheral surface of the base end side pin F2, the plastic fluid material is surely pushed into the gap Q and filled. be able to. By allowing the plastic fluid material to flow into the gap Q, the periphery of the heat medium tube 6 is filled with metal, so that the watertightness and airtightness of the heat transfer plate 1B can be further improved.

The effect of substantially the same as that of the first embodiment can be obtained by the method of manufacturing the heat transfer plate according to the present embodiment. Further, the heat transfer plate 1B provided with the heat medium tube 6 can be easily manufactured.

Further, for example, the shapes of the concave groove 3, the lid groove 4, the lid plate 5, and the heat medium tube 6 according to the first embodiment and the second embodiment are merely examples, and may be other shapes. ..

1,1A, 1B Heat transfer plate 2 Base member 3 Concave groove 4 Lid groove 5 Lid plate 6 Heat medium tube F Rotation tool for main joining (rotation tool)
F2 Base end side pin F3 Tip side pin FD Rotation tool for temporary joining J1, J2 Butt part W, W1 Plasticization area SP1, SP2 Start position EP1, EP2 End position S1, S2 Midpoint

Claims (8)

A lid plate is inserted into a lid groove formed around a concave groove that opens on the surface of a base member, and a butt plate is formed while providing a gap between a side wall of the lid groove and a side surface of the lid plate. Insertion process and
Includes a main joining step in which a rotary tool provided with a base end side pin and a tip end side pin is relatively moved along the butt portion to perform friction stir welding with respect to the butt portion.
The taper angle of the base end side pin is larger than the taper angle of the tip end side pin, and a stepped step portion is formed on the outer peripheral surface of the base end side pin.
In the main joining step, after inserting the rotating tip side pin into the start position set on the surface of the base member, the rotation center axis of the rotation tool is moved to a position overlapping the butt portion to a predetermined depth. When the tip end side pin is gradually pushed in until the pin becomes, and the rotation tool is relatively moved along the abutting portion, the outer peripheral surface of the base end side pin, the surface of the base member, and the surface of the lid plate are brought into contact with each other. A method for manufacturing a heat transfer plate, characterized in that the plastic fluid material generated by frictional stirring is pushed into the gap by the outer peripheral surface of the base end side pin while being brought into contact with each other. A lid plate is inserted into a lid groove formed around a concave groove that opens on the surface of a base member, and a butt plate is formed while providing a gap between a side wall of the lid groove and a side surface of the lid plate. Insertion process and
Includes a main joining step in which a rotary tool provided with a base end side pin and a tip end side pin is relatively moved along the butt portion to perform friction stir welding with respect to the butt portion.
The taper angle of the base end side pin is larger than the taper angle of the tip end side pin, and a stepped step portion is formed on the outer peripheral surface of the base end side pin.
In the main joining step, the tip side pin is inserted from the start position set on the butt portion, and the tip side pin is gradually pushed into the butt portion while moving in the traveling direction until it reaches a predetermined depth. When the rotating tool is relatively moved along the base end side, the plastic fluid material generated by friction stir is brought into contact with the outer peripheral surface of the base end side pin, the surface of the base member, and the surface of the lid plate. A method for manufacturing a heat transfer plate, which comprises pressing and filling the gap with an outer peripheral surface of a pin. A lid plate is inserted into a lid groove formed around a concave groove that opens on the surface of a base member, and a butt plate is formed while providing a gap between a side wall of the lid groove and a side surface of the lid plate. Insertion process and
Includes a main joining step in which a rotary tool provided with a base end side pin and a tip end side pin is relatively moved along the butt portion to perform friction stir welding with respect to the butt portion.
The taper angle of the base end side pin is larger than the taper angle of the tip end side pin, and a stepped step portion is formed on the outer peripheral surface of the base end side pin.
In the main joining step, when the rotary tool is relatively moved along the butt portion, the outer peripheral surface of the base end side pin is brought into contact with the surface of the base member and the surface of the lid plate by friction stirring. The generated plastic fluid material is pushed into the gap by the outer peripheral surface of the base end side pin to fill the gap, an end position is set on the surface of the base member, friction stir welding is performed on the butt portion, and then the rotation tool is terminated. A method for manufacturing a heat transfer plate, characterized in that the tip side pin is gradually pulled out from the base member while being moved to a position, and the rotating tool is separated from the base member at the end position. A lid plate is inserted into a lid groove formed around a concave groove that opens on the surface of a base member, and a butt plate is formed while providing a gap between a side wall of the lid groove and a side surface of the lid plate. Insertion process and
Includes a main joining step in which a rotary tool provided with a base end side pin and a tip end side pin is relatively moved along the butt portion to perform friction stir welding with respect to the butt portion.
The taper angle of the base end side pin is larger than the taper angle of the tip end side pin, and a stepped step portion is formed on the outer peripheral surface of the base end side pin.
In the main joining step, when the rotary tool is relatively moved along the butt portion, the outer peripheral surface of the base end side pin is brought into contact with the surface of the base member and the surface of the lid plate by friction stirring. The generated plastic fluid material is pushed into the gap by the outer peripheral surface of the base end side pin to fill the gap, an end position is set on the butt portion, and after friction stir welding with the butt portion, the rotation tool is placed in the end position. A method for manufacturing a heat transfer plate, characterized in that the tip side pin is gradually pulled out from the base member and the lid plate while being moved to, and the rotary tool is separated from the base member and the lid plate at the end position. .. The transmission according to any one of claims 1 to 4, wherein a heat medium tube inserting step of inserting the heat medium tube into the concave groove is provided before the lid plate inserting step. How to manufacture a hot plate. Claims 1 to 2, wherein in the main joining step, when the rotating tool is relatively moved along the butt portion, the flat surface of the tip side pin is in contact with the bottom surface of the lid groove. The method for manufacturing a heat transfer plate according to any one of 5. The method for manufacturing a heat transfer plate according to any one of claims 1 to 6, wherein a temporary joining step of temporarily joining the butted portions is included before the main joining step. In the temporary joining step, the rotary tool used for friction stir welding includes a proximal end side pin and a distal end side pin, and the taper angle of the proximal end side pin is larger than the taper angle of the distal end side pin. A stepped step is formed on the outer peripheral surface of the end pin.
The method for manufacturing a heat transfer plate according to claim 7, wherein the friction stir welding is performed in a state where the outer peripheral surface of the base end side pin is in contact with the surface of the base member and the surface of the lid plate.

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