JP2021154314A - Method of manufacturing liquid-cooled jacket - Google Patents

Abstract

To provide a method of manufacturing a liquid-cooled jacket that can manufacture a liquid-cooled jacket at low cost.SOLUTION: The method of manufacturing a liquid-cooled jacket includes: a placing step in which sealed bodies 3A and 3B are placed on both end faces respectively of a jacket main body 2 so as to form a first butted part J1 and a second butted part J2; and a main joining step in which the first butted part J1 is subjected to friction stirring by inserting a tip-side pin F3 of a first rotary tool FC that rotates through a surface 3a of the one sealed body 3A, and the second butted part J2 is subjected to friction stirring by inserting a tip-side pin F3 of a second rotary tool FD that rotates through a surface 3a of the other sealed body 3B. In the main joining step, the jacket main body 2 and the sealed bodies 3A and 3B are rotated or parallelly moved so as to friction-stir the jacket main body and the sealed bodies, while making a pair of holding parts 22 and 22 press and hold the one sealed body 3A and the other sealed body 3B from respective outsides thereof.SELECTED DRAWING: Figure 9

Description

The present invention relates to a method for manufacturing a liquid-cooled jacket.

For example, Patent Document 1 discloses a method for manufacturing a liquid-cooled jacket in which a jacket body and a sealing body that seals an opening of the jacket body are joined by friction stir welding. In the method for manufacturing the liquid-cooled jacket, a rotating tool is inserted vertically from the side surface of the jacket body and the sealing body, and friction stir welding is performed by rotating the jacket body around the jacket body.

JP-A-2018-69322

Here, a liquid-cooled jacket may be formed by a frame-shaped jacket body and two sealing bodies covering both sides of the jacket body. In this case, the frame-shaped jacket body and the sealing body on one side are clamped to the gantry, friction stir welding is performed on the sealing body on one side, and then the clamp is temporarily released. Then, the member to be joined is turned inside out, the sealing body on the other side is placed, and the member to be joined and the sealing body on the other side are clamped again on the gantry, and friction stir welding is performed on the sealing body on the other side. I do. That is, since the jacket body and the two sealing bodies are friction-stir welded, there is a problem that the work man-hours increase and the manufacturing cost increases. In addition, the jig that clamps the frame-shaped jacket body and the sealing body hinders the movement of the rotating tool, and it is necessary to perform friction stir welding separately for each area, which causes a problem that the work man-hours increase. be.

From such a viewpoint, it is an object of the present invention to provide a method for manufacturing a liquid-cooled jacket capable of manufacturing the liquid-cooled jacket at low cost.

In order to solve the above problems, the present invention is composed of a frame-shaped jacket main body and two sealing bodies for sealing the openings on both sides of the jacket main body, and the jacket main body and the two sealing bodies. The first rotation tool and the second rotation tool used in the friction stirring are provided with a base end side pin and a tip end side pin, and the base end side pin is provided. The taper angle of the side pin is larger than the taper angle of the tip side pin, and a stepped pin step portion is formed on the outer peripheral surface of the base end side pin, and both end surfaces of the jacket body are formed. By placing each of the sealing bodies, one end face of the jacket body and the back surface of the one sealing body are overlapped to form a first butt portion, and the other end face of the jacket body is formed. The mounting step of forming the second butt portion by superimposing the back surface of the other sealing body and the tip side pin of the rotating first rotation tool are inserted from the surface of one of the sealing bodies. In a state where the tip end side pin is in contact with one of the sealing bodies, or the jacket body and one of the sealing bodies, and the outer peripheral surface of the base end side pin is in contact with the surface of one of the sealing bodies. Along the first butt portion, the first butt portion is rubbed and agitated relative to the circumference of the jacket body at a predetermined depth, and the tip side pin of the second rotating tool that rotates is the other. Inserted from the surface of the sealing body, the outer peripheral surface of the base end side pin is brought into contact with the other sealing body or the jacket body and the other sealing body, and the outer peripheral surface of the base end side pin is brought into contact with the other sealing body. The main joining step of frictionally stirring the second butt portion by making a relative circumference around the jacket body at a predetermined depth along the second butt portion in a state of being in contact with the surface of the sealed body. In the main joining step, the surface of one of the sealing bodies and the surface of the other sealing body are pressed and held by a pair of holding portions from both outer sides, and the holding portion is used. It is characterized in that the jacket main body and the two sealing bodies are rotated or moved in parallel to frictionally stir the jacket main body and the two sealing bodies.

According to such a manufacturing method, in order to rotate or translate the jacket body and the two sealing bodies in a state where the frame-shaped jacket body and the two sealing bodies are held by a pair of holding portions, a clamping operation is performed. There is no need to do it multiple times. Further, the holding portion and the first rotation tool and the second rotation tool do not interfere with each other during the main joining process. That is, the jig for positioning the jacket body and the two sealing bodies does not hinder the movement of the first rotation tool and the second rotation tool. As a result, the work man-hours can be reduced, and incidental equipment such as a device for driving the first rotation tool and the second rotation tool can be simplified, and a liquid-cooled jacket can be manufactured at low cost. be able to. Further, since 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 sealing body, the generation of burrs can be suppressed.

Further, a plurality of fins are formed on the back surface of the other sealing body, and in the main joining step, at least a part of the tips of the plurality of fins are brought into contact with the back surface of one of the sealing bodies. In this state, it is preferable to frictionally stir the jacket body and the two sealing bodies.

According to such a manufacturing method, the tip of the fin comes into contact with one of the sealing bodies, so that the deformation of the sealing body can be suppressed.

Further, in the main joining step, it is preferable to insert the first rotation tool so that the tip of the tip side pin of the first rotation tool reaches the jacket body.
Further, in the main joining step, it is preferable to insert the second rotation tool so that the tip of the tip side pin of the second rotation tool reaches the jacket body.

According to such a manufacturing method, the joint strength at each butt portion can be increased.

Further, in the main joining step, the first rotation tool and the second rotation tool are relative to each other so that the rotation center axis of the first rotation tool and the rotation center axis of the second rotation tool substantially coincide with each other. It is preferable to move it.

According to such a manufacturing method, since the two sealing bodies can be joined at the same time, the work man-hours can be further reduced. Further, since the pressing force of the first rotation tool and the second rotation tool acts evenly on the members to be joined, it is possible to join in a well-balanced manner.

Further, in the main joining step, when the first rotation tool is rotated clockwise, the second rotation tool is rotated counterclockwise, and when the first rotation tool is rotated counterclockwise, the second rotation tool is rotated right. It is preferable to rotate it.

According to such a manufacturing method, since the rotation directions of the first rotation tool and the second rotation tool match on the front and back of the frame-shaped jacket body, misalignment between the jacket body and the two sealing bodies can be prevented, and the joining accuracy can be prevented. Can be enhanced.

Further, in the main joining step, the tip side pin is rotated at a predetermined rotation speed to perform frictional stirring, and when the tip side pin is pulled out in the main joining step, the rotation speed is gradually higher than the predetermined rotation speed. It is preferable to move the tip end side pin relative to the end position while raising.
Further, in the main joining step, the tip side pin is rotated at a predetermined rotation speed to perform frictional stirring, and when the tip side pin is inserted in the main joining step, the tip side pin is inserted at a speed higher than the predetermined rotation speed. It is preferable to rotate the tip-side pin and insert the tip-side pin while gradually reducing the rotation speed.

According to such a manufacturing method, the small pressing force at the time of inserting or removing the first rotation tool and the second rotation tool can be supplemented by the rotation speed, so that friction stir welding can be preferably performed.

According to the method for manufacturing a liquid-cooled jacket according to the present invention, the liquid-cooled jacket can be manufactured at low cost.

It is a side view which shows the 1st rotation tool and the 2nd rotation tool which concerns on embodiment of this invention. It is an enlarged sectional view of the 1st rotation tool and the 2nd rotation tool. It is sectional drawing which shows the 1st modification of the 1st rotation tool and the 2nd rotation tool. It is sectional drawing which shows the 2nd modification of the 1st rotation tool and the 2nd rotation tool. It is sectional drawing which shows the 3rd modification of the 1st rotation tool and the 2nd rotation tool. It is an exploded perspective view of the liquid-cooled jacket which concerns on embodiment of this invention. It is sectional drawing which shows the mounting process of the manufacturing method of the liquid-cooled jacket which concerns on this embodiment. It is a perspective view which shows the holding process of the manufacturing method of the liquid-cooled jacket which concerns on this embodiment. It is a perspective view which shows the friction stir welding process of the manufacturing method of the liquid-cooled jacket which concerns on this embodiment. It is sectional drawing which shows the friction stir welding process of the manufacturing method of the liquid-cooled jacket which concerns on this embodiment. It is a perspective view which shows after the friction stir welding process of the manufacturing method of the liquid-cooled jacket which concerns on this embodiment.

Embodiments of the present invention will be described with reference to the drawings as appropriate. The present invention is not limited to the following embodiments. In addition, some or all of the components in each embodiment can be combined as appropriate. In the following description, the "front surface" means the surface opposite to the "back surface".

First, as shown in FIG. 1, the first rotation tool FC and the second rotation tool FD used in the method for manufacturing a liquid-cooled jacket according to the present embodiment will be described. Since both have the same structure, the first rotation tool FC will be described here as an example.

The first rotary tool FC is made 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. When the first rotation tool FC is rotated clockwise, the pin step portion F21 is set counterclockwise from the base end side to the tip end side.

When rotating the first rotation tool FC 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 stepped portion F21, so that the metal that overflows to the outside of the metal member to be joined (jacket body 2 and sealing bodies 3A, 3B) 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 center axis Z 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). On the other hand). 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 perpendicular to the rotation center axis Z.

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 when the first rotation tool FC is rotated clockwise, it is set counterclockwise from the base end side to the tip end side.

When the first rotation tool FC 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 first rotation tool FC can be changed as appropriate. FIG. 3 is a side view showing a first modification of the first rotation tool and the second rotation tool of the present invention. As shown in FIG. 3, in the first rotation tool FE according to the first modification, the step angle C formed by the step bottom surface F21a of the pin step portion F21 and the step side surface F21b 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 first rotation tool and the second rotation tool of the present invention. As shown in FIG. 4, in the rotation tool FG 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 first rotation tool and the second rotation tool of the present invention. As shown in FIG. 5, in the first rotation tool FH according to the third modification, the step bottom surface F21a is inclined 10 ° upward with respect to the horizontal plane from the rotation center axis Z of the tool toward the outer peripheral direction. The step side surface F21b is parallel to the vertical surface. In this way, the step bottom surface F21a may be formed so as to incline upward from the horizontal plane from the rotation center axis Z 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 first rotation tool and the second rotation tool.

As shown in FIG. 6, the liquid-cooled jacket 1 according to the present embodiment is composed of a jacket body 2 and sealing bodies 3A and 3B. The liquid-cooled jacket 1 is a device that circulates a fluid inside to cool an arranged heating element (not shown). The jacket body 2 and the sealing bodies 3A and 3B are integrated by friction stir welding.

The method for manufacturing a liquid-cooled jacket according to the present embodiment includes a preparation step, a mounting step, and a main joining step. The preparation step is a step of preparing the jacket body 2 and the sealing bodies 3A and 3B. The jacket body 2 has a rectangular frame shape. The inside of the jacket body 2 is a rectangular hollow portion. The jacket body 2 may be any metal (aluminum, aluminum alloy, magnesium, magnesium alloy, copper, copper alloy, titanium, titanium alloy, etc.) that can be agitated by friction, but in this embodiment, it is made of an aluminum alloy. The corners of the jacket body 2 may be right angles, but in the present embodiment, round chamfering is performed.

The sealing bodies 3A and 3B are plate-shaped members that seal the opening of the jacket body 2. The sealing bodies 3A and 3B have a rectangular shape. The corners of the sealing bodies 3A and 3B may be right angles, but in the present embodiment, round chamfering is performed. The sealing bodies 3A and 3B are not particularly limited as long as they are metals that can be frictionally agitated, but in the present embodiment, they are formed mainly containing an aluminum alloy. On the back surface 3b of the sealing body 3B, a plurality of plate-shaped fins 31 that rise perpendicularly to the back surface 3b are formed. The height dimension of the fin 31 is substantially the same as the height dimension of the jacket body 2.

The sealing body 3B provided with the fins 31 may be formed by joining a plurality of fins to a plate-shaped member by brazing or the like, or may be formed by cutting one raw material.

As shown in FIG. 7, the mounting step is a step of mounting the sealing bodies 3A and 3B on the jacket body 2. In the mounting step, the sealing body 3A is mounted on the end surface 11a of the jacket body 2, and the sealing body 3B is mounted on the end surface 11b of the jacket body 2. The end surface 11a of the jacket body 2 and the back surface 3b of the sealing body 3A are abutted to form the first abutting portion J1. The end surface 11b of the jacket body 2 and the back surface 3b of the sealing body 3B are abutted to form the second abutting portion J2. The plane shapes of the jacket body 2 and the sealing bodies 3A and 3B are the same size and shape. Therefore, the outer surface 11d of the jacket body 2, the side surface 3c of the sealing body 3A, and the side surface 3c of the sealing body 3B become flush with each other in the circumferential direction by the mounting step. The jacket body 2 and the sealing bodies 3A and 3B may be temporarily joined by welding, friction stir welding, or the like.

As shown in FIGS. 8 to 11, this joining step is a step of friction stir welding the first butt portion J1 and the second butt portion J2 using the first rotation tool FC and the second rotation tool FD, respectively. In this joining step, a holding step and a friction stir welding step are performed. In the holding step, the jacket body 2 and the sealing bodies 3A and 3B are pressed from both outsides and held by a holding device (jig) provided with a pair of holding portions 22. In the present embodiment, an intermediate plate 21 is interposed between the holding portion 22 and the sealing body 3A, and between the holding portion 22 and the sealing body 3B, respectively. The holding portion 22 has a columnar shape, and its end faces come into surface contact with the intermediate plates 21 and 21, respectively. By providing the intermediate plate 21, the pressing force of the holding portion 22 can be dispersed, and the jacket body 2 and the sealing bodies 3A and 3B can be reliably held. The intermediate plate 21 may be omitted.

The holding portion 22 of the holding device, the jacket body 2 and the sealing bodies 3A and 3B rotate or move in parallel in synchronization with each other. That is, the sandwiching device holds the jacket body 2 and the sealing bodies 3A and 3B in the circumferential direction while the surface 3a of the sealing body 3A and the surface 3a of the sealing body 3B are pressed and sandwiched by the holding portions 22 and 22, respectively. It can be rotated in a straight line in the up-down, left-right, and front-back directions.

As shown in FIG. 9, the first rotation tool FC and the second rotation tool FD are attached to a robot arm (not shown) having a rotation driving means such as a spindle unit at the tip in the present embodiment.

In this joining step, as shown in FIGS. 8 and 9, a holding step of holding the jacket body 2 and the sealing bodies 3A and 3B is performed using a holding device (jig). Then, the robot arm is operated to perform a friction stir welding step of simultaneously friction stir welding the first butt portion J1 and the second butt portion J2. That is, in the friction stir welding step, the first rotation tool FC rotated clockwise is inserted into the start position SP1 set on the surface 3a of the sealing body 3A to perform friction stir welding of the first butt portion J1 and seal. The second rotation tool FD rotated counterclockwise is inserted into the start position (not shown) set on the surface 3a of the body 3B to perform friction stir welding of the second butt portion J2. Since the first rotation tool FC and the second rotation tool FD move relative to each other under the same joining conditions (excluding the rotation direction) across the jacket body 2, the first rotation tool FC will be described here as an example.

In the friction stir welding step, as shown in FIG. 9, friction stir welding is continuously performed between the closet section, the main section, and the detachment section. The closet section is a section from the start position SP1 set on the surface 3a of the sealing body 3A to the intermediate point S1 also set on the surface 3a of the sealing body 3A. This section is a section from the intermediate point S1 to the intermediate point S2 set on the surface 3a of the sealing body 3A after passing through the intermediate point S1 around the outer edge of the surface 3a of the sealing body 3A. Is. The detachment section is a section from the intermediate point S2 to the end position EP1 set on the surface 3a of the sealing body 3A. The intermediate points S1 and S2 are set at positions corresponding to the first butt portion J1 on the surface 3a of the sealing body 3A so as to be separated from each other. Further, the start position SP1 and the end position EP1 are set inside the surface 3a of the sealing body 3A, which is the position corresponding to the first butt portion J1.

In the closet section, the rotation center axis Z of the first rotation tool FC is arranged so as to be perpendicular to the start position SP1, and the tip side pin F3 is gradually moved to a predetermined depth while moving relative to the intermediate point S1. I will push in. When the first rotation tool FC reaches the intermediate point S1, the section shifts to this section as it is. A plasticized region W1 is formed in the movement locus of the first rotation tool FC. When shifting the first rotation tool FC from the closet section to this section, the first rotation tool FC is linearly or arcuate so that the first rotation tool FC does not stop or the movement speed decreases in the middle. It is preferable to move the FC.

In this section, the first rotation tool FC is maintained at a predetermined depth while the rotation center axis Z of the first rotation tool FC, the surface 3a of the sealing body 3A, and the end surface 11a of the jacket body 2 are perpendicular to each other. The rotary tool FC is relatively moved along the outer edge portion of the surface 3a of the sealing body 3A to go around the outer edge portion. Here, the "predetermined depth" refers to the depth at which the tip end side pin F3 of the first rotation tool FC is inserted from the intermediate point S1 to the intermediate point S2 in this section. In the present embodiment, as shown in FIG. 10, while the outer peripheral surface of the base end side pin F2 is in contact with the surface 3a of the sealing body 3A, the flat surface F4 of the tip end side pin F3 of the first rotation tool FC is a jacket. It is set to reach the end face 11a of the main body 2.

At the corners of the jacket body 2 and the sealing body 3A, the first rotation tool FC is relatively moved while rotating the holding portions 22 and 22 (or the robot arm may be moved). Further, in the side portions of the jacket body 2 and the sealing body 3A, the first rotation tool FC is relatively moved in a straight line while moving at least one of the holding portions 22, 22 and the robot arm.

In this section, when the start end and the end end of the plasticized region W1 overlap and the first rotation tool FC reaches the intermediate point S2, the section shifts to the detachment section as it is. When shifting the first rotation tool FC from this section to the departure section, the first rotation tool FC is first in a straight line or arc shape in a plan view so that the first rotation tool FC does not stop or the moving speed decreases in the middle. It is preferable to move the rotation tool FC.

In the detachment section, as shown in FIG. 11, while moving relative to the end position EP1 from the intermediate point S2, the tip side pin F3 is gradually pulled out and detached at the end position EP1.

In the present embodiment, in this section, the flat surface F4 at the tip of the tip side pin F3 is set to reach the end face 11a of the jacket body 2, but the tip side pin F3 is in contact with only the sealing body 3A. Friction stir welding may be performed. In this case, the first butt portion J1 is plastically fluidized and joined by the frictional heat between the tip side pin F3 and the sealing body 3A.

In the friction stir welding step, the movement routes of both are set so that the rotation center axis Z of the first rotation tool FC and the rotation center axis Z of the second rotation tool FD substantially coincide with each other. That is, the first rotation tool FC and the second rotation tool FD are used to simultaneously perform friction stir welding of the first butt portion J1 and the second butt portion J2. Further, the joining conditions such as the rotation speed, the moving speed, and the insertion depth of the first rotation tool FC and the second rotation tool FD are also set to be the same. However, the first rotation tool FC is rotated clockwise when viewed from the base end side of the first rotation tool FC, and the second rotation tool FD is rotated counterclockwise when viewed from the base end side of the second rotation tool FD. When rotating the first rotation tool FC counterclockwise, the second rotation tool FD is rotated clockwise.

According to the method for manufacturing a liquid-cooled jacket according to the present embodiment described above, the jacket body 2 and the sealing body 2 and the sealing body 2 are held in a state where the frame-shaped jacket main body 2 and the sealing bodies 3A and 3B are held by a pair of holding portions 22. Since 3A and 3B are rotated or translated, the holding work can be performed only once. That is, it is not necessary to perform the clamping work a plurality of times as in the conventional case. Further, the holding portion 22, the first rotation tool FC, and the second rotation tool FD do not interfere with each other during the main joining process. That is, the jig for positioning the jacket body 2 and the sealing bodies 3A and 3B does not hinder the movement of the first rotation tool FC and the second rotation tool FD, and continues from the start position SP1 to the end position EP1. Friction stir welding can be performed. As a result, the work man-hours can be reduced, and incidental equipment such as a device for driving the first rotation tool FC and the second rotation tool FD can be simplified, and the liquid-cooled jacket 1 can be made at low cost. Can be manufactured at.

Further, in this joining step, 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 surfaces 3a and 3a of the sealing bodies 3A and 3B, the plastic fluid material can be suppressed and burrs can be suppressed. Can be suppressed.

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 (surfaces 3a and 3a of the sealing bodies 3A and 3B) can be reduced. , The bulge formed on the side of the stepped 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 is easily pulled out of the pin step portion F21 while being pressed by 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, as shown in FIG. 10, since the height dimension of the fin 31 is set to be substantially the same as the height dimension of the jacket body 2, the tip of the fin 31 comes into contact with the sealing body 3A. As a result, deformation of the sealing bodies 3A and 3B can be suppressed. Further, by providing the fins 31, the heat exchange efficiency of the liquid-cooled jacket 1 can be improved.

Further, as in the present embodiment, in the main joining step, it is preferable to insert the first rotation tool FC so that the flat surface (tip) F4 of the tip side pin F3 of the first rotation tool FC reaches the jacket body 2. .. Further, in this joining step, it is preferable to insert the second rotation tool FD so that the flat surface (tip) F4 of the tip side pin F3 of the second rotation tool FD reaches the jacket body 2. According to such a manufacturing method, the joint strength in the first butt portion J1 and the second butt portion J2 can be increased.

Further, as in the present embodiment, in the main joining step, the first rotation tool FC so that the rotation center axis Z of the first rotation tool FC and the rotation center axis Z of the second rotation tool FD substantially coincide with each other. And it is preferable to move the second rotation tool FD relative to each other. According to such a manufacturing method, the sealing bodies 3A and 3B can be joined at the same time, so that the work man-hours can be further reduced. Further, since the pressing force of the first rotation tool FC and the second rotation tool FD acts evenly on the jacket body 2 and the sealing bodies 3A and 3B, it is possible to join them in a well-balanced manner.

Further, as in the present embodiment, when the first rotation tool FC is rotated clockwise, the second rotation tool FD is rotated counterclockwise, and when the first rotation tool FC is rotated counterclockwise, the second rotation tool FD is rotated counterclockwise. Is preferably rotated clockwise. According to this manufacturing method, the rotation directions of the first rotation tool FC and the second rotation tool FD match on the front and back sides of the frame-shaped jacket body 2, so that the jacket body 2 and the sealing bodies 3A and 3B are misaligned. It can be prevented and the joining accuracy can be improved.

Here, for example, the start position SP1 may be set on the surface 3a of the sealing body 3A corresponding to the first butt portion J1, and the first rotation tool FC may be vertically inserted to perform friction stir welding. In the form, excessive frictional heat is generated at the start position SP1, and there is a risk of poor joining. On the other hand, as in the present embodiment, the start position SP1 is set on the surface 3a of the sealing body 3A inside the first butt portion J1, and the tip side pin F3 is relatively moved toward the first butt portion J1. By gradually pushing in while making it, it is possible to prevent the frictional heat from becoming excessive on the first butt portion J1.

Similarly, the end position EP1 may be set on the surface 3a of the sealing body 3A corresponding to the first butt portion J1, and the rotation tool F may be vertically detached at the end position EP1. Excessive frictional heat may be generated at the end position EP1, resulting in poor joining. On the other hand, as in the present embodiment, the end position EP1 is set on the surface 3a of the sealing body 3A inside the first butt portion J1, and the tip side pin F3 is relatively moved from the first butt portion J1. By gradually pulling it out, it is possible to prevent the frictional heat from becoming excessive on the first butt portion J1.

Further, in this joining step, since the start end and the end end of the plasticized region W1 are overlapped, the airtightness and watertightness of the liquid-cooled jacket 1 can be improved.

Further, in this joining step, the rotation speeds of the first rotation tool FC and the second rotation tool FD may be constant, but may be changed. In the indentation section of the main joining process, the rotation speed of the first rotation tool FC and the second rotation tool FD at the start position SP1 is V1, and the rotation speed of the first rotation tool FC and the second rotation tool FD in this section is V2. Then, V1> V2 may be set. The rotation speed V2 is a preset constant rotation speed in this section. That is, at the start position SP1, 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 process, the rotation speeds of the first rotation tool FC and the second rotation tool FD in this section are set to V2, and the rotation speeds of the first rotation tool FC and the second rotation tool FD when the second rotation tool FD is detached at the end position EP1. Assuming that the rotation speed is V3, V3> V2 may be set. That is, after shifting to the detachment section, the first rotation tool FC and the second rotation tool FD may be detached from the sealing bodies 3A and 3B while gradually increasing the rotation speed toward the end position EP1. By setting as described above when the first rotation tool FC and the second rotation tool FD are pushed into the sealing body 3 or separated from the sealing body 3, a small pressing force during the pushing section or the separating section is performed. Can be supplemented by the rotational speed, so that friction stir welding can be preferably performed.

Although the embodiments of the present invention have been described above, the design can be appropriately changed within a range not contrary to the gist of the present invention. For example, in the present embodiment, all of the plurality of fins 31 are brought into contact with the back surface 3b of the sealing body 3A, but some of the tips of the plurality of fins 31 are brought into contact with the back surface 3b of the sealing body 3A. You may. Further, the fin 31 may be omitted.

Further, in the present joining step, in the present embodiment, friction stir welding is performed simultaneously on the front and back surfaces of the jacket body 2, but they may be performed separately. Further, friction stir welding may be performed on the front and back surfaces of the jacket body 2 using different rotation tools. Further, the front and back surfaces of the jacket body 2 may be separately subjected to friction stir welding using the same rotating tool.

Further, in the present embodiment, the start position SP1 and the end position EP1 are set inside the first butt portion J1 (second butt portion J2), but correspond to the first butt portion J1 (second butt portion J2). It may be set on the surfaces 3a, 3a of the sealing bodies 3A, 3B. In this case, the first rotation tool FC and the second rotation tool FD are gradually moved on the surfaces 3a and 3a of the sealing bodies 3A and 3B corresponding to the first butt portion J1 (second butt portion J2). You may push it in. Further, the first rotation tool FC and the second rotation tool FD are gradually pulled out while being relatively moved on the surfaces 3a and 3a of the sealing bodies 3A and 3B corresponding to the first butt portion J1 (second butt portion J2). You may leave it. By doing so, it is possible to prevent the frictional heat from becoming excessive at one point on the surfaces 3a and 3a of the sealing bodies 3A and 3B corresponding to the first butt portion J1 (second butt portion J2).

1 Liquid-cooled jacket 2 Jacket body 3A Encapsulant 3B Encapsulant 22 Holding part FC 1st rotation tool FD 2nd rotation tool F2 Base end side pin F3 Tip side pin J1 1st butt part J2 2nd butt part SP1 Start position EP1 end position

Claims (8)

A liquid that is composed of a frame-shaped jacket body and two sealing bodies that seal the openings on both sides of the jacket body, and joins the jacket body and the two sealing bodies by friction stir welding. It ’s a method of manufacturing cold jackets.
The first rotation tool and the second rotation tool used for friction stir welding are provided with a base end side pin and a tip end side pin.
The taper angle of the base end side pin is larger than the taper angle of the tip end side pin, and a stepped pin step portion is formed on the outer peripheral surface of the base end side pin.
By placing the encapsulants on both end faces of the jacket body, one end surface of the jacket body and the back surface of the one end of the encapsulant are overlapped to form a first butt portion, and the first butt portion is formed. A mounting step of superimposing the other end surface of the jacket body and the back surface of the other sealing body to form a second butt portion.
The tip-side pin of the rotating first rotation tool is inserted from the surface of one of the sealants, and the tip-side pin is brought into contact with one of the sealants, or the jacket body and one of the sealants. At the same time, in a state where the outer peripheral surface of the base end side pin is in contact with the surface of one of the sealing bodies, the outer peripheral surface of the base end side pin is made to circulate relatively around the jacket body at a predetermined depth along the first abutting portion. While rubbing and stirring the first butt portion,
The tip-side pin of the rotating second rotation tool is inserted from the surface of the other sealing body, and the tip-side pin is brought into contact with the other sealing body, or the jacket body and the other sealing body. At the same time, in a state where the outer peripheral surface of the base end side pin is in contact with the surface of the other sealing body, the jacket body is relatively made to go around the jacket body at a predetermined depth along the second butt portion. The main joining step of rubbing and stirring the second butt portion is included.
In the main joining step, while pressing and holding the surface of one of the sealing bodies and the surface of the other sealing body from both outer sides with a pair of holding portions, the jacket body and the jacket body and the jacket body are held by using the holding portions. A method for producing a liquid-cooled jacket, which comprises rotating or translating the two sealing bodies to frictionally stir the jacket body and the two sealing bodies. A plurality of fins are formed on the back surface of the other sealing body.
In the main joining step, the jacket body and the two sealing bodies are frictionally agitated with the tips of at least a part of the plurality of fins in contact with the back surface of one of the sealing bodies. The method for manufacturing a liquid-cooled jacket according to claim 1. The liquid according to claim 1 or 2, wherein in the main joining step, the first rotation tool is inserted so that the tip of the tip side pin of the first rotation tool reaches the jacket body. How to make a cold jacket. Any one of claims 1 to 3, wherein in the main joining step, the second rotation tool is inserted so that the tip of the tip side pin of the second rotation tool reaches the jacket body. The method for manufacturing a liquid-cooled jacket according to the item. In the main joining step, the first rotation tool and the second rotation tool are relatively moved so that the rotation center axis of the first rotation tool and the rotation center axis of the second rotation tool substantially coincide with each other. The method for manufacturing a liquid-cooled jacket according to any one of claims 1 to 4, wherein the liquid-cooled jacket is manufactured. In the main joining step, when the first rotation tool is rotated clockwise, the second rotation tool is rotated counterclockwise, and when the first rotation tool is rotated counterclockwise, the second rotation tool is rotated clockwise. The method for manufacturing a liquid-cooled jacket according to claim 5, wherein the liquid-cooled jacket is manufactured. In the main joining step, the tip side pin is rotated at a predetermined rotation speed to perform friction stir welding.
Claims 1 to 6 are characterized in that when the tip end side pin is pulled out in the main joining step, the tip end side pin is relatively moved to an end position while gradually increasing the rotation speed from the predetermined rotation speed. The method for manufacturing a liquid-cooled jacket according to any one of the above. In the main joining step, the tip side pin is rotated at a predetermined rotation speed to perform friction stir welding.
When the tip side pin is inserted in the main joining step, the tip side pin is rotated at a speed higher than the predetermined rotation speed, and the tip side pin is inserted while gradually reducing the rotation speed. The method for manufacturing a liquid-cooled jacket according to any one of claims 1 to 7.

Images