JP2021133405A - Liquid-cooled jacket manufacturing method - Google Patents

Abstract

To provide a liquid-cooled jacket manufacturing method which can improve joint strength of a liquid-cooled jacket, and can manufacture the jacket at low cost.SOLUTION: A liquid-cooled jacket manufacturing method includes a first main joining process in which in the state that a bottom surface of a shoulder part F1 is brought into contact with at least a surface 3a of an encapsulant 3 while bringing a flat surface of a stirring pin F2 into contact with the encapsulant 3 and a peripheral wall part 11 and bringing an apical surface of a projection into contact with only the peripheral wall part 11, the stirring pin is so made as to relatively go around along a first butt part J1 at a prescribed depth, thereby frictionally stirring the first butt part J1. In the main joining process, a jacket body 2 and the encapsulant 3 are rotated or moved in parallel by use of a pair of holding parts 22 while pressing and holding a bottom 10 of the jacket body 2 and the surface 3a of the encapsulant 3 from both outer sides by the pair of holding parts 22, thereby frictionally stirring the jacket body 2 and the encapsulant 3.SELECTED DRAWING: Figure 5

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

In the invention according to Patent Document 1, in order to rotate the rotation tool around the jacket body with the rotation tool and the side surface of the jacket body perpendicular to each other, the rotation tool is provided with, for example, a rotation driving means such as a spindle unit at the tip. It is necessary to change / adjust the angle and insertion position of the rotation center axis of the rotation tool by attaching it to the arm robot. Therefore, there is a problem that ancillary equipment such as a device for driving the rotary tool is costly, and as a result, the manufacturing cost is high. Further, it is desired to further improve the bonding strength of the liquid-cooled jacket.

From such a viewpoint, it is an object of the present invention to provide a method for manufacturing a liquid-cooled jacket, which can increase the bonding strength of the liquid-cooled jacket and can manufacture the liquid-cooled jacket at low cost.

In order to solve the above problems, the present invention comprises a jacket body having a bottom, a peripheral wall portion rising from the peripheral edge of the bottom, and a support column rising from the bottom, and a sealing body for sealing the opening of the jacket body. A method for manufacturing a liquid-cooled jacket in which the jacket body and the sealing body are joined by frictional stirring, and the rotary tool used in frictional stirring is a stirring that hangs down from the center of the shoulder portion and the bottom surface of the shoulder portion. The stirring pin is tapered, has a flat surface perpendicular to the rotation center axis of the rotation tool at its tip, and has a protrusion protruding from the flat surface. The jacket body having a stepped bottom surface and a stepped side surface rising from the stepped bottom surface toward the opening on the inner peripheral edge of the peripheral wall portion, and a thickness larger than the height of the stepped side surface. In the preparatory step of preparing the sealing body having the The second butt portion is formed by abutting the step bottom surface of the peripheral wall portion and the back surface of the sealing body, and the end surface of the support column and the back surface of the sealing body are overlapped with each other to form the fourth butt portion. The stirring pin of the rotating tool is inserted into the first abutting portion, the flat surface of the stirring pin is brought into contact with the sealing body and the peripheral wall portion, and the protrusion is formed. While the tip surface of the portion is in contact with only the peripheral wall portion, the bottom surface of the shoulder portion is in contact with at least the surface of the sealing body, and the circumference is relatively made at a predetermined depth along the first abutting portion. In the first joining step, the bottom portion of the jacket body and the surface of the sealing body are held in pairs from both outer sides, including a first joining step of rubbing and stirring the first butt portion. It is characterized in that the jacket body and the sealing body are rotated or moved in parallel using the holding portion while being pressed and held by the portion to frictionally stir the jacket body and the sealing body.

Further, the present invention includes a jacket body having a bottom portion, a peripheral wall portion rising from the peripheral edge of the bottom portion, and a support column rising from the bottom portion, and a hole into which the tip of the support column is inserted, and seals the opening of the jacket body. A method for manufacturing a liquid-cooled jacket, which is composed of a sealing body and joins the jacket body and the sealing body by frictional stirring. It is provided with a stirring pin that hangs down from the center of the bottom surface, and the stirring pin has a tapered shape, and has a flat surface at the tip thereof that is perpendicular to the rotation center axis of the rotation tool, and the flat surface. A peripheral wall step portion having a step bottom surface and a step side surface rising from the step bottom surface toward the opening is formed on the inner peripheral edge of the peripheral wall portion, and at the tip of the support column. A jacket body having a step bottom surface of the support column and a step side surface of the support column rising from the step bottom surface of the support column, and the sealing body having a thickness larger than the height of the step side surface are prepared. In the preparatory step and by placing the sealing body on the jacket body, the stepped side surface of the peripheral wall portion and the side surface of the sealing body are abutted to form the first abutting portion, and the stepped bottom surface of the peripheral wall portion is formed. The back surface of the sealing body is abutted to form a second abutment portion, and the step side surface of the strut and the hole wall of the hole portion are abutted to form a third abutment portion. A mounting step of superimposing the back surface of the sealing body to form a fourth butt portion, and inserting the stirring pin of the rotating tool into the first butt portion and inserting the flat surface of the stirring pin into the first butt portion. The first in a state where the bottom surface of the shoulder portion is in contact with at least the surface of the sealing body while the tip surface of the protrusion is in contact with only the peripheral wall portion while being in contact with the sealing body and the peripheral wall portion. Including the first joining step of frictionally stirring the first butt portion by making a relative circumference along the butt portion at a predetermined depth, in the first joining step, with the bottom portion of the jacket body. While pressing and holding the surface of the sealing body from both outer sides with a pair of holding portions, the jacket main body and the sealing body are rotated or moved in parallel using the holding portions to rotate or parallel move the jacket main body and the sealing body. It is characterized by frictionally stirring with a stationary body.

According to such a manufacturing method, the jacket body and the sealing body are rotated or translated while the bottom of the jacket body and the surface of the sealing body are held by the pair of holding portions, so that the jacket body and the sealing body are held during the first joining step. The part and the rotation tool do not interfere. That is, the jig for positioning the jacket body and the sealing body does not hinder the movement of the rotating tool. As a result, the man-hours can be reduced and the liquid-cooled jacket can be manufactured at low cost. Further, since the plastic fluid material can be pressed on the bottom surface of the shoulder portion, the generation of burrs can be suppressed. Further, since the plastic fluid material wound around the protrusions is pressed by a flat surface, the oxide film of each butt portion can be reliably separated. As a result, the joint strength of each butt portion can be increased.

Further, the stirring pin of the rotating tool is inserted from the surface of the sealing body so that the flat surface of the stirring pin is brought into contact with only the sealing body, and the tip surface of the protrusion is only the support column. Further, a second joining step of agitating the fourth butt portion by relatively moving the rotating tool in a state where the bottom surface of the shoulder portion is in contact with the surface of the sealing body while being in contact with the fourth butt portion. It is preferable to include it.

Further, the stirring pin of the rotating tool is inserted into the third abutting portion, the flat surface of the stirring pin is brought into contact with the sealing body and the support column, and the tip surface of the protrusion portion is brought into contact with the support column. Further, a second joining step of frictionally agitating the third butt portion by relatively moving the rotating tool with the bottom surface of the shoulder portion in contact with at least the surface of the sealing body while contacting only the third butt portion. It is preferable to include it.

According to such a manufacturing method, the bonding strength can be increased.

Further, it is preferable to perform the second main joining step after the first main joining step.

It is also preferable to perform the first main joining step after the second main joining step.

Further, in the first main joining step, the rotation tool is rotated at a predetermined rotation speed to perform frictional stirring, and when the stirring pin is separated in the first main joining step, the rotation speed is gradually higher than the predetermined rotation speed. It is preferable to move it to the end position while increasing the rotation speed.

Further, in the first main joining step, the rotation tool is rotated at a predetermined rotation speed to perform frictional stirring, and when the stirring pin is inserted in the first main joining step, the rotation speed is higher than the predetermined rotation speed. It is preferable that the stirring pin is inserted in a state of being rotated at a speed and moved to the first butt portion while gradually reducing the rotation speed.

According to such a manufacturing method, friction stir welding can be preferably performed.

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

It is a side view which shows the rotation tool which concerns on embodiment of this invention. It is an exploded perspective view of the liquid-cooled jacket which concerns on 1st 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 1st Embodiment. It is a perspective view which shows the holding process of the 1st main joining process of the manufacturing method of the liquid-cooled jacket which concerns on 1st Embodiment. It is a perspective view which shows the friction stirring process of the 1st main joining process of the manufacturing method of the liquid-cooled jacket which concerns on 1st Embodiment. It is sectional drawing which shows the 1st main joining process of the manufacturing method of the liquid-cooled jacket which concerns on 1st Embodiment. It is a perspective view which shows after the completion of the 1st main joining process of the manufacturing method of the liquid-cooled jacket which concerns on 1st Embodiment. It is sectional drawing which shows the 2nd joining process of the manufacturing method of the liquid-cooled jacket which concerns on 1st Embodiment. It is sectional drawing which shows the 2nd main joining process of the manufacturing method of the liquid-cooled jacket which concerns on 2nd Embodiment of this invention.

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. First, the rotation tool used in the joining method according to the present embodiment will be described. As shown in FIG. 1, the rotary tool F is formed of, for example, tool steel, and is mainly composed of a columnar shoulder portion F1 and a stirring pin F2 hanging from the center of the bottom surface F1a of the shoulder portion F1. There is.

The stirring pin F2 has a tapered shape that tapers away from the shoulder portion F1. At the tip of the stirring pin F2, a flat flat surface F3 that is perpendicular to the rotation center axis Z of the rotation tool F and is flat is formed. For example, a columnar protrusion F4 projects from the flat surface F3.
The stirring pin F2 is formed with a flat surface F3 perpendicular to the rotation center axis Z and a protrusion F4 protruding from the flat surface F3. The protrusion F4 exhibits, for example, a columnar shape. A spiral groove is formed on the outer peripheral surface F10 of the stirring pin F2. In the present embodiment, in order to rotate the rotation tool F clockwise, the spiral groove of the stirring pin F2 is formed counterclockwise from the base end to the tip end. In other words, the spiral groove is formed counterclockwise when viewed from above when the spiral groove is traced from the base end to the tip end.

When the rotation tool F is rotated counterclockwise, it is preferable to form the spiral groove clockwise from the base end to the tip end. In other words, the spiral groove in this case is formed clockwise when viewed from above when the spiral groove is traced from the base end to the tip end. By setting the spiral groove in this way, the metal plastically fluidized during the friction stir step can be guided to the tip side of the stirring pin F2 by the spiral groove.

[First Embodiment]
The first embodiment of the present invention will be described with reference to the drawings as appropriate. As shown in FIG. 2, the liquid-cooled jacket 1 according to the first embodiment is composed of a jacket body 2 and a sealing body 3. The liquid-cooled jacket 1 is a device that circulates a fluid inside to cool an arranged heating element. The jacket body 2 and the sealing body 3 are integrated by friction stir welding. In the following description, the "front surface" means the surface opposite to the "back surface".

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 bottom portion 10 is a plate-shaped member having a rectangular shape. The peripheral wall portion 11 is a wall portion that rises in a rectangular frame shape from the peripheral edge portion of the bottom portion 10. The corner of the peripheral wall portion 11 may be a right angle, but in the present embodiment, a round chamfering process is performed. A support column 12 stands up at the bottom 10. The number of columns 12 is not particularly limited, but is two in this embodiment. A recess 13 is formed in the bottom portion 10 and the peripheral wall portion 11. Although the jacket body 2 of the present embodiment is integrally formed, for example, the peripheral wall portion 11 may be divided and joined by a seal member to be integrated.

A peripheral wall step portion 14 is formed along the inner peripheral edge of the peripheral wall portion 11 of the jacket body 2 on the end surface 11a which is the end surface of the peripheral wall portion 11. The peripheral wall step portion 14 is composed of a step bottom surface 14a and a step side surface 14b rising from the step bottom surface 14a. The step bottom surface 14a is formed at a position one step lower than the end surface 11a. The step bottom surface 14a has the same height as the end surface 12a of the support column 12.
The sealing body 3 is a plate-shaped member that seals the opening of the jacket body 2. The corners of the sealing body 3 may be right angles, but in the present embodiment, round chamfering is performed. The side surface 3c of the sealing body 3 is preferably larger than the step side surface 14b. That is, the sealing body 3 has a thickness larger than that of the step side surface 14b. The sealing body 3 is not particularly limited as long as it is a metal capable of friction stir welding, but is made of an aluminum alloy in this embodiment.

Next, a method for manufacturing the liquid-cooled jacket according to the present embodiment will be described. In the method for manufacturing a liquid-cooled jacket according to the present embodiment, a preparation step, a mounting step, a first main joining step, and a second main joining step are performed.
The preparation step is a step of preparing the jacket body 2 and the sealing body 3 having the above-described configuration. The jacket body 2 and the sealing body 3 are not particularly limited in terms of manufacturing method, but the jacket body 2 is molded by die casting, for example. The sealing body 3 is formed by, for example, extrusion molding.

As shown in FIG. 3, the mounting step is a step of mounting the sealing body 3 on the peripheral wall stepped portion 14 formed on the jacket body 2. The stepped side surface 14b of the peripheral wall stepped portion 14 and the side surface 3c of the sealing body 3 are abutted to form the first abutting portion J1. Further, the step bottom surface 14a of the peripheral wall step portion 14 and the back surface 3b of the sealing body 3 are overlapped to form the second butt portion J2. Further, the end surface 12a of the support column 12 and the back surface 3b of the sealing body 3 are overlapped to form the fourth butt portion J4. Further, the thickness of the jacket body 2 is larger than the height of the step side surface 14b of the peripheral wall step portion 14. Therefore, when the sealing body 3 is placed on the peripheral wall step portion 14 formed on the jacket body 2, the surface 3a of the sealing body 3 is higher than the end surface 11a of the peripheral wall portion 11. The jacket body 2 and the sealing body 3 may be temporarily joined by welding, friction stir welding, or the like.

As shown in FIGS. 4 to 7, the first main joining step is a step of friction stir welding the first butt portion J1 using the rotary tool F. In the first main joining step, a holding step and a friction stir welding step are performed. As shown in FIG. 4, in the holding step, the jacket body 2 and the sealing body 3 are pressed from both outer sides by a holding device (jig) provided with a pair of holding portions 22 to hold the jacket body 2. In the present embodiment, an intermediate plate 21 is interposed between the holding portion 22 and the bottom portion 10 and between the holding portion 22 and the sealing body 3, 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 body 3 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 body 3 rotate or move in parallel in synchronization with each other. That is, the sandwiching device rotates the jacket body 2 and the sealing body 3 in the circumferential direction while the bottom portion 10 of the jacket body 2 and the surface 3a of the sealing body 3 are pressed and sandwiched by the holding portions 22 and 22, respectively. At the same time, it can be linearly moved up and down, left and right, and front and back.
In the first main joining step, first, the rotary tool F attached to the friction stir welder is rotated clockwise. The position of the rotary tool F is fixed so as not to move with respect to the friction stir welding device in the first main joining step of the present embodiment. That is, the rotation tool F is not displaced, and the jacket body 2 and the sealing body 3 are moved with respect to the rotation tool F, so that the rotation tool F is moved relative to the jacket body 2 and the sealing body 3. Friction stir welding is performed by allowing the mixture to stir.

Next, as shown in FIG. 4, a holding step of holding the jacket main body 2 and the sealing body 3 is performed, and the jacket main body 2 and the sealing body 3 are held by using a holding device (jig). Then, by operating the sandwiching device, as shown in FIG. 5, the rotary tool F is inserted into the start position SP1 set on the surface 3a of the sealing body 3 to perform the friction stirring step. In the friction stir welding step, the press-in section, the main section, and the detachment section are continuously subjected to friction stir welding.
As shown in FIG. 5, the closet section is a section from the start position SP1 set on the surface 3a of the sealing body 3 to the intermediate point S1 set on the first butt portion J1. This section is a section from the intermediate point S1 to the intermediate point S2 (see FIG. 7) set on the first butt portion J1 after going around the first butt portion J1 and passing through the intermediate point S1. The detachment section is a section from the intermediate point S2 to the end position EP1 (see FIG. 7) set on the surface 3a of the sealing body 3.

In the closet section, as shown in FIG. 6, the rotation center axis Z of the rotation tool F is arranged so as to be perpendicular to the start position SP1 and becomes a “predetermined depth” while being relatively moved toward the intermediate point S1. The stirring pin F2 is gradually pushed in until. When the rotation tool F 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 rotation tool F.
Further, when the intermediate point S1 is reached, the bottom surface F1a of the shoulder portion F1 and the surface 3a of the sealing body 3 are set to come into contact with each other. At this time, the bottom surface F1a of the shoulder portion F1 and the end surface 11a of the peripheral wall portion 11 may be in contact with each other. That is, the bottom surface F1a of the shoulder portion F1 is brought into contact with at least the surface 3a of the sealing body 3. Then, the process shifts to friction stir welding in this section as it is.

In this section, the rotation tool F is maintained at a "predetermined depth" while the rotation center axis Z of the rotation tool F, the end surface 11a of the peripheral wall portion 11 and the surface 3a of the sealing body 3 are perpendicular to each other. F is relatively moved along the first butt portion J1 to make a circuit around the jacket body 2 and the sealing body 3. When the rotation tool F reaches the intermediate point S2, the process shifts to the departure section as it is. The above-mentioned "predetermined depth" refers to the depth at which the stirring pin F2 is inserted in this section from the intermediate point S1 to the intermediate point S2 on the first butt portion J1. In the present embodiment, a predetermined depth is set so that the flat surface F3 at the tip of the stirring pin F2 is brought into contact with the sealing body 3 and the peripheral wall portion 11, and the tip surface of the protrusion F4 is brought into contact with the peripheral wall portion 11. ing.

At the corners of the jacket body 2 and the sealing body 3, the rotating tool F is relatively moved while rotating the holding portions 22 and 22. On the sides of the jacket body 2 and the sealing body 3 excluding the corners, the rotating tool F is relatively moved while the holding portions 22 and 22 are translated. In this section, the flat surface F3 of the stirring pin F2 is brought into contact with the sealing body 3 and the peripheral wall portion 11, the tip surface of the protruding portion F4 is brought into contact with only the peripheral wall portion 11, and the bottom surface F1a of the shoulder portion F1 and the sealing body are brought into contact with each other. Friction stir welding is performed so that the surface 3a of 3 is in contact with the surface 3a.

In the detachment section, as shown in FIG. 7, the stirring pin F2 is gradually pulled out while moving relative to the end position EP1 from the intermediate point S2, and is detached at the end position EP1. When the first main joining step is completed, the holding device is detached from the jacket body 2 and the sealing body 3.
As shown in FIG. 8, the second main joining step is a step of friction stir welding the sealing body 3 and the support column 12 using the rotary tool F. In the second main joining step, the rotating tool F is inserted vertically from the surface 3a of the sealing body 3, is relatively moved along the fourth butt portion J4 by one or more turns, and then the rotating tool F is separated from the sealing body 3. Let me. In the second main joining step, the flat surface F3 of the stirring pin F2 is brought into contact with only the sealing body 3, and the tip surface of the protruding portion F4 is brought into contact with only the support column 12, while the bottom surface F1a of the shoulder portion F1 and the sealing body are brought into contact with each other. Friction stir welding is performed so that the surface 3a of 3 is in contact with the surface 3a. In the second main joining step, a plasticized region W2 is formed in the movement locus of the rotation tool F.

According to the method for manufacturing a liquid-cooled jacket according to the first embodiment described above, the jacket main body is held in a state where the bottom portion 10 of the jacket main body 2 and the surface 3a of the sealing body 3 are held from both outer sides by a pair of holding portions 22. Since the 2 and the sealing body 3 are rotated or moved, the holding portion 22 and the rotating tool F do not interfere with each other during the first main joining process. That is, since the jig for positioning the jacket body 2 and the sealing body 3 is not on the movement route of the rotation tool F, the movement of the rotation tool F is not hindered. As a result, the man-hours can be reduced, the first main joining process can be easily performed, and the manufacturing cost can be reduced.

Further, according to the first joining step according to the present embodiment, since the plate thickness of the sealing body 3 is set to be larger than that of the step side surface 14b, it is possible to prevent the joint portion from becoming short of metal. ..
Further, the joining strength can be increased by performing the second joining step. Further, in the stirring pin F2, a protrusion F4 protruding from the flat surface F3 is formed. That is, a stepped portion is formed by the flat surface F3 of the stirring pin F2 and the protruding portion F4. Therefore, since the plastic fluid material wound around the protrusion F4 is pressed by the flat surface F3, the oxide film of the first butt portion J1, the second butt portion J2, and the fourth butt portion J4 can be reliably separated. can. As a result, the joint strength of the first butt portion J1, the second butt portion J2, and the fourth butt portion J4 can be increased.

Here, the start position SP1 may be set on the first butt portion J1 and the rotation tool F may be inserted vertically to perform friction stir welding, but in this form, excessive frictional heat is generated at the start position SP1. It may occur and cause poor joining. On the other hand, as in the present embodiment, the start position SP1 is set at a position away from the first butt portion J1, and the first butt portion is gradually pushed in while being relatively moved toward the first butt portion J1. It is possible to prevent the frictional heat from becoming excessive on J1. The start position SP1 may be set on the end surface 11a of the peripheral wall portion 11.

Similarly, the end position EP1 may be set on the first butt portion J1 and the rotation tool F may be vertically detached at the end position EP1, but in this form, excessive frictional heat is generated at the end position EP1. However, there is a risk of poor joining. On the other hand, as in the present embodiment, the end position EP1 is set at a position away from the first butt portion J1 and gradually pulled out while moving relative to the first butt portion J1 on the first butt portion J1. It is possible to prevent the frictional heat from becoming excessive. The end position EP1 may be set on the end surface 11a of the peripheral wall portion 11.

Further, by setting the start position SP1 and the intermediate point S1 so that the angle formed by the straight line connecting the start position SP1 and the first butt portion J1 and the first butt portion J1 is an obtuse angle, the first butt portion J1 It is possible to prevent the relative movement of the rotating tool F from stopping or slowing down the movement speed, which causes excessive frictional heat to occur and causes poor joining.
Similarly, by setting the end position EP1 and the intermediate point S2 so that the angle formed by the straight line connecting the end position EP1 and the first butt portion J1 and the first butt portion J1 is an obtuse angle, the first butt portion J1 It is possible to prevent the relative movement of the rotating tool F from stopping or slowing down the movement speed to generate excessive frictional heat, resulting in poor joining.

Further, in the first main joining step, since the start end and the end end of the plasticized region W1 on the first butt portion J1 are overlapped, the airtightness and watertightness of the liquid-cooled jacket 1 can be improved.
The first main joining step may be performed after the second main joining step. Further, in the closet section and the withdrawal section, the movement route may be set so that the movement locus of the rotation tool F becomes a curve. The curve is, for example, an arc shape or the like. Further, in the first joining step of the present embodiment, the position of the rotating tool F is set not to be displaced, but the rotating tool F, the jacket body 2 and the sealing body 3 (holding device) are both moved. Friction stir welding may be performed. For example, when the rotary tool F is attached to the robot arm, the robot arm, the jacket body 2 and the sealing body 3 (holding device) may both be moved to perform friction stir welding.

Further, in this joining step, the rotation speed of the rotation tool F may be constant or variable. In the indentation section of the main joining step, if the rotation speed of the rotation tool F at the start position SP1 is V1 and the rotation speed of the rotation tool F in this section is V2, V1> V2 may be satisfied. The rotation speed V2 is a preset constant rotation speed in the first butting portion J1. 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 first main joining step, if the rotation speed of the rotation tool F in this section is V2 and the rotation speed of the rotation tool F when detached at the end position EP1 is V3, V3> V2 may be satisfied. That is, after shifting to the detachment section, the rotation tool F may be detached from the sealing body 3 while gradually increasing the rotation speed toward the end position EP1. When the rotary tool F is pushed into the sealing body 3 or separated from the sealing body 3, by setting as described above, it is possible to supplement the small pressing force in the pushing-in section or the separating section with the rotation speed. Therefore, friction stir welding can be preferably performed.

[Second Embodiment]
Next, a method for manufacturing the liquid-cooled jacket according to the second embodiment of the present invention will be described. As shown in FIG. 9, the second embodiment is mainly different from the first embodiment in that the support column 12 is provided with the support column step portion 16. In the second embodiment, the parts different from the first embodiment will be mainly described.
The jacket body 2A is composed of a bottom portion 10, a peripheral wall portion 11, and a support column 12. The bottom portion 10 and the peripheral wall portion 11 are the same as those in the first embodiment. A protrusion 15 is formed on the tip end side of the support column 12. The shape of the protruding portion 15 is not particularly limited, but in the present embodiment, it has a columnar shape. By forming the projecting portion 15, a strut step portion 16 is formed at the tip of the strut 12. The strut step portion 16 is formed with a step bottom surface 16a and a step side surface 16b rising from the step bottom surface 16a. The step bottom surface 16a is formed at the same height position as the step bottom surface 14a of the peripheral wall step portion 14.

A hole 4 is formed in the sealing body 3A. The hole 4 is formed at a position corresponding to the protrusion 15 of the support column 12. The hole 4 is formed in a size such that the protrusion 15 can be inserted.
In the method for manufacturing a liquid-cooled jacket according to the second embodiment, a preparation step, a mounting step, a first main joining step, and a second main joining step are performed. The preparation step is a step of preparing the jacket body 2A and the sealing body 3A having the above-described configuration.
As shown in FIG. 9, the mounting step is a step of mounting the sealing body 3A on the jacket body 2A. In the mounting step, the protrusion 15 of the support column 12 is inserted into the hole 4 while the sealing body 3A is mounted on the step bottom surface 14a of the peripheral wall step portion 14. The stepped side surface 14b of the peripheral wall stepped portion 14 and the side surface 3c of the sealing body 3A are abutted to form the first abutting portion J1. Further, the step bottom surface 14a of the peripheral wall step portion 14 and the back surface 3b of the sealing body 3A are overlapped to form the second butt portion J2. Further, the step side surface 16b of the support column 12 and the hole wall 4a of the hole portion 4 are abutted to form a step side surface butt portion J12 (third butt portion). Further, the step bottom surface 16a of the support column 12 and the back surface 3b of the sealing body 3A are overlapped to form the step bottom surface butt portion J13 (fourth butt portion). The thickness of the sealing body 3A is larger than the height dimension of the step side surface 14b of the peripheral wall step portion 14 and the step side surface 16b of the support column 12.

The first main joining step is the same as that of the first embodiment. In the second main joining step, the stirring pin F2 of the rotation tool F is inserted into the step side surface butt portion J12 and the step bottom surface butt portion J13, and the rotation tool F is relatively moved along the step side surface butt portion J12 for one or more turns. The stirring pin F2 of the rotating rotation tool F is inserted into the step side surface abutting portion J12, the flat surface F3 of the stirring pin F2 is brought into contact with the sealing body 3A and the support column 12, and the tip surface of the protrusion F4 is made only on the support column 12. While making contact, the rotation tool F is relatively moved with the bottom surface F1a of the shoulder portion F1 in contact with at least the surface 3a of the sealing body 3A to move the step side surface butt portion J12 (third butt portion) and the step bottom surface butt portion J13. (Fourth butt) is agitated by friction. In the second main joining step, a plasticized region W2 is formed in the movement locus of the rotation tool F.

The present embodiment described above can also achieve substantially the same effect as that of the first embodiment. Further, according to the second joining step of the present embodiment, the jacket body 2A and the sealing body 3A can be easily positioned by inserting the hole 4 of the sealing body 3A into the protruding portion 15 of the support column 12. It can be carried out. Further, since the plate thickness of the sealing body 3A is set to be larger than that of the step side surface 16b of the support column 12, it is possible to prevent the joint portion from becoming short of metal.
Further, in the second joining step, since the plastic fluid material wound around the protrusion F4 is pressed by the flat surface F3, the step side surface butt portion J12 (third butt portion) and the step bottom butt portion J13 (fourth). The oxide film of the butt portion) can be reliably divided. As a result, the joint strength of the step side surface butt portion J12 (third butt portion) and the step bottom surface butt portion J13 (fourth butt portion) can be increased.

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. Further, in the first main joining step, the start position SP1 and the end position EP1 may be set on the first butt portion J1. Also in this case, in the closet section, it is preferable to perform friction stir while gradually pushing in while moving the rotary tool F relative to each other. Further, in the detachment section, it is preferable to perform friction stir while gradually pulling out the rotating tool F while moving it relative to each other. By doing so, it is possible to prevent the frictional heat from becoming excessive at one point on the first butt portion J1.

1 Liquid-cooled jacket 2 Jacket body 3 Encapsulant 10 Bottom 11 Peripheral wall 22 Holding F Rotating tool F1 Shoulder F1a Bottom F2 Stirring pin F3 Flat surface F4 Protrusion J1 First butt J2 Second butt J12 Step side butt Part (third butt part)
J13 Step bottom butt part (4th butt part)
SP1 Start position EP1 End position W1 Plasticization area W2 Plasticization area

Claims (8)

The jacket body is composed of a bottom portion, a peripheral wall portion rising from the peripheral edge of the bottom portion, a jacket main body having a support column rising from the bottom portion, and a sealing body for sealing an opening of the jacket main body. A method for manufacturing a liquid-cooled jacket that is joined by friction stir welding.
The rotary tool used for friction stir welding includes a shoulder portion and a stirring pin that hangs down from the center of the bottom surface of the shoulder portion.
The stirring pin has a tapered shape, has a flat surface perpendicular to the rotation center axis of the rotation tool at its tip, and has a protrusion protruding from the flat surface.
The jacket body having a peripheral step portion having a step bottom surface and a step side surface rising from the step bottom surface toward the opening on the inner peripheral edge of the peripheral wall portion, and a thickness larger than the height of the step side surface. The preparatory step for preparing the sealed body to have, and
By placing the sealing body on the jacket body, the stepped side surface of the peripheral wall portion and the side surface of the sealing body are abutted to form a first abutting portion, and the stepped bottom surface of the peripheral wall portion and the sealing body are formed. A mounting step of forming a second butt portion by abutting the back surfaces of the above columns and superimposing the end surface of the support column and the back surface of the sealing body to form a fourth butt portion.
The stirring pin of the rotating tool is inserted into the first abutting portion, the flat surface of the stirring pin is brought into contact with the sealing body and the peripheral wall portion, and the tip surface of the protruding portion is brought into contact with the peripheral wall portion. With the bottom surface of the shoulder portion in contact with at least the surface of the sealing body while being in contact with only the first butt portion, the first butt portion is relatively made to go around at a predetermined depth along the first butt portion. Including the first joining step of rubbing and stirring,
In the first main joining step, the bottom of the jacket body and the surface of the sealing body are pressed and held by a pair of holding portions from both outer sides, and the jacket body and the sealing are used by using the holding portions. A method for producing a liquid-cooled jacket, which comprises rotating or translating a stop body to frictionally stir the jacket body and the sealing body. The stirring pin of the rotating tool is inserted from the surface of the sealing body, the flat surface of the stirring pin is brought into contact with only the sealing body, and the tip surface of the protrusion is brought into contact with only the strut. Further including a second joining step of agitating the fourth butt portion by relatively moving the rotating tool in a state where the bottom surface of the shoulder portion is in contact with the surface of the sealing body. The method for manufacturing a liquid-cooled jacket according to claim 1. A jacket body having a bottom portion, a peripheral wall portion rising from the peripheral edge of the bottom portion, and a support column rising from the bottom portion, and a sealing body provided with a hole into which the tip of the support column is inserted and sealing an opening of the jacket body. It is a method for manufacturing a liquid-cooled jacket, which is configured and joins the jacket body and the sealing body by friction stir welding.
The rotary tool used for friction stir welding includes a shoulder portion and a stirring pin that hangs down from the center of the bottom surface of the shoulder portion.
The stirring pin has a tapered shape, has a flat surface perpendicular to the rotation center axis of the rotation tool at its tip, and has a protrusion protruding from the flat surface.
A peripheral wall step portion having a step bottom surface and a step side surface rising from the step bottom surface toward the opening is formed on the inner peripheral edge of the peripheral wall portion, and the step bottom surface of the support column and the support column are formed at the tip of the support column. A preparatory step for preparing a jacket body having a stepped side surface of a strut rising from the stepped bottom surface of the step, a jacket body having a stepped portion of the strut, and a sealing body having a thickness larger than the height of the stepped side surface.
By placing the sealing body on the jacket body, the stepped side surface of the peripheral wall portion and the side surface of the sealing body are abutted to form a first abutting portion, and the stepped bottom surface of the peripheral wall portion and the sealing body are formed. The back surface of the column is abutted to form a second abutment portion, and the step side surface of the strut and the hole wall of the hole portion are abutted to form a third abutment portion. The mounting process of superimposing the back surface to form the fourth butt portion,
The stirring pin of the rotating tool is inserted into the first abutting portion, the flat surface of the stirring pin is brought into contact with the sealing body and the peripheral wall portion, and the tip surface of the protruding portion is brought into contact with the peripheral wall portion. With the bottom surface of the shoulder portion in contact with at least the surface of the sealing body while being in contact with only the first butt portion, the first butt portion is relatively made to go around at a predetermined depth along the first butt portion. Including the first joining step of rubbing and stirring,
In the first main joining step, the bottom of the jacket body and the surface of the sealing body are pressed and held by a pair of holding portions from both outer sides, and the jacket body and the sealing are used by using the holding portions. A method for producing a liquid-cooled jacket, which comprises rotating or translating a stop body to frictionally stir the jacket body and the sealing body. The stirring pin of the rotating tool is inserted into the third abutment portion, the flat surface of the stirring pin is brought into contact with the sealing body and the support column, and the tip surface of the protrusion portion is made only on the support column. Further including a second joining step of agitating the third abutting portion by relatively moving the rotating tool with the bottom surface of the shoulder portion in contact with at least the surface of the sealing body while making contact. The method for manufacturing a liquid-cooled jacket according to claim 3, wherein the liquid-cooled jacket is manufactured. The method for manufacturing a liquid-cooled jacket according to claim 2 or 4, wherein the second joining step is performed after the first joining step. The method for manufacturing a liquid-cooled jacket according to claim 2 or 4, wherein the first main joining step is performed after the second main joining step. In the first main joining step, the rotary tool is rotated at a predetermined rotation speed to perform friction stir welding.
Any one of claims 1 to 6, wherein when the stirring pin is detached in the first main joining step, the stirring pin is moved to the end position while gradually increasing the rotation speed from the predetermined rotation speed. The method for manufacturing a liquid-cooled jacket according to the section. In the first main joining step, the rotary tool is rotated at a predetermined rotation speed to perform friction stir welding.
When the stirring pin is inserted in the first main joining step, the stirring pin is inserted in a state of being rotated at a speed higher than the predetermined rotation speed, and the rotation speed is gradually reduced to the first butt portion. The method for manufacturing a liquid-cooled jacket according to any one of claims 1 to 7, wherein the liquid-cooled jacket is moved.

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