JP2021133407A - 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: This method includes a first main joining process in which only a stirring pin F2 of a rotary tool F is inserted in a surface 3a of an encapsulant 3, and in the state that a flat surface F3 is brought into contact with only the encapsulant 3 and an apical surface of a projection F4 is brought into contact with only a peripheral wall part 11, an outer peripheral edge part of the surface 3a of the encapsulant 3 is so made as to relatively go around along the peripheral wall part 11, thereby frictionally stirring a 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 6

Description

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

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 also desired for the liquid-cooled jacket to further increase the bonding strength between the metal members.

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 be manufactured 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. This is a method for manufacturing a liquid-cooled jacket in which the jacket body and the sealing body are joined by frictional stirring, and the outer peripheral surface of the stirring pin of the rotary tool used in frictional stirring is inclined so as to be tapered. The stirring pin is provided with a flat surface perpendicular to the rotation center axis of the rotation tool on the tip side thereof, and is further provided with a protrusion protruding from the flat surface, and the sealing body is placed on the jacket body. The end surface of the peripheral wall portion and the back surface of the sealing body are overlapped to form the first butt portion, and the end surface of the support column and the back surface of the sealing body are overlapped to form the second butt portion. Only the stirring pin of the rotating tool and the setting step is inserted from the surface of the sealing body, the flat surface is brought into contact with only the sealing body, and the tip surface of the protrusion is only the peripheral wall portion. Includes a first joining step in which the first butt portion is rubbed and agitated by making a relative circumference around the peripheral wall portion at a predetermined depth along the first butt portion in a state of being in contact with the first butt portion. In the first main joining step, the bottom portion 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. It is characterized in that the jacket body and the sealing body are frictionally agitated by rotating or moving the stop body in parallel.

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. This is 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 friction stirring, and the outer peripheral surface of a stirring pin of a rotating tool used for friction stirring is tapered. The stirring pin is provided with a flat surface perpendicular to the rotation center axis of the rotation tool on the tip side thereof, and further has a protrusion protruding from the flat surface, and the step bottom surface is provided at the tip of the support column. A strut step portion having the step surface rising from the step bottom surface is formed, and the step bottom surface of the strut is formed at the same height position as the end surface of the peripheral wall portion, and the thickness of the sealing body is set to the step side surface. In the preparatory step of forming a larger size, and by placing the sealing body on the jacket body, the end surface of the peripheral wall portion and the back surface of the sealing body are overlapped to form the first butt portion, and the first butt portion is formed. Placement in which the step side surface of the support column and the hole wall of the hole portion are abutted to form a step side surface abutting portion, and the step bottom surface of the support column and the back surface of the sealing body are overlapped to form a step bottom surface abutting portion. In the process, only the stirring pin of the rotating tool that rotates is inserted from the surface of the sealing body, the flat surface is brought into contact with only the sealing body, and the tip surface of the protrusion is made only on the peripheral wall portion. The present invention includes a first joining step of frictionally stirring the first butt portion by making a relative circumference around the peripheral wall portion at a predetermined depth along the first butt portion in a contacted state. In the first main joining step, the bottom portion 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 body are sealed using the holding portions. The body is rotated or moved in parallel to rub and stir the jacket body and the sealing 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, ancillary equipment such as a device for driving the rotary tool can be simplified, and a liquid-cooled jacket can be manufactured at low cost. Further, since the flat surface of the stirring pin is brought into contact with only the sealing body and the first butt portion is subjected to friction stir welding while the tip surface of the protrusion is brought into contact with only the peripheral wall portion, the load acting on the friction stir welding device is applied. Can be made smaller. Further, since the plastic fluid material wound up on the protrusion is pressed by the flat surface, the friction and agitation around the protrusion can be performed more reliably, and the oxide film on the butt portion is surely divided. Thereby, the joint strength of the first butt portion can be increased.

Further, only the stirring pin of the rotating tool is inserted from the surface of the sealing body into the second abutting portion, the flat surface is brought into contact with only the sealing body, and the tip surface of the protruding portion is brought into contact with the sealing body only. The second butt portion is moved relative to the second butt portion at a predetermined depth in a state where only the stirring pin is in contact with the sealing body and the support column while being in contact with only the support column. It is preferable to further include a second joining step of rubbing and stirring.

Further, only the stirring pin of the rotating tool is inserted from the surface of the sealing body into the step side surface abutting portion, the flat surface is brought into contact with the sealing body and the support column, and the tip of the protruding portion is formed. Further including a second joining step of frictionally agitating the step side surface butt portion by relatively moving the surface along the step side surface butt portion at a predetermined depth in a state where the surface is in contact with only the support column. Is preferable.

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.

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

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

Further, in the first main joining step, the stirring pin 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 the stirring pin is relatively 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 1st 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 manufacturing method of the liquid-cooled jacket which concerns on 1st 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 1st Embodiment. It is sectional drawing which shows the friction stirring process of the manufacturing method of the liquid-cooled jacket which concerns on 1st Embodiment. It is a perspective view which shows 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.

[Rotation tool]
Embodiments of the present invention will be described with reference to the drawings as appropriate. First, the rotation tool F used in the embodiment of the present invention will be described. 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.

As shown in FIG. 1, the rotation tool F includes a connecting portion F1 and a stirring pin F2. The rotary tool F is made of, for example, tool steel. The connecting portion F1 is a portion connected to the rotating shaft of the friction stir device (not shown). The connecting portion F1 has a columnar shape, and a screw hole (not shown) for fastening a bolt is formed.

The stirring pin F2 hangs down from the connecting portion F1 and is coaxial with the connecting portion F1. The outer peripheral surface of the stirring pin F2 is inclined so as to be tapered. The stirring pin F2 is provided with a flat surface F3 perpendicular to the rotation center axis C of the rotation tool F on the tip end side, and is further provided with a protrusion F4 protruding from the flat surface F3. The shape of the protrusion F4 is not particularly limited, but in the present embodiment, it has a columnar shape. A stepped portion is formed by the side surface of the protruding portion F4 and the flat surface F3.

A spiral groove is engraved on the outer peripheral surface of the stirring pin F2. In the present embodiment, in order to rotate the rotation tool F clockwise, the spiral groove 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 friction stir welding is guided to the tip end side of the stirring pin F2 by the spiral groove. As a result, the amount of metal that overflows to the outside of the metal member to be joined (jacket body 2 and sealing body 3) can be reduced.

In this embodiment, the rotation tool F is attached to a friction stir device that can move in the horizontal direction and the vertical direction. The rotation tool F may be attached to a robot arm having a rotation driving means such as a spindle unit at its tip.

[First Embodiment]
(Composition of liquid-cooled jacket)
As shown in FIG. 1, 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 is mainly composed of a bottom portion 10 and a peripheral wall portion 11. 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 strut 12 stands up at the bottom 10. The number of columns 12 is not particularly limited, but is two in this embodiment. The end surface 12a of the support column 12 has the same height as the end surface 11a of the peripheral wall portion 11. 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.

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 sealing body 3 is not particularly limited as long as it is a metal capable of friction stir welding, but in the present embodiment, it is formed mainly containing an aluminum alloy.

(Manufacturing method of liquid-cooled jacket)
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.

(Preparation process)
As shown in FIG. 2, the preparation step is a step of preparing the jacket body 2 and the sealing body 3. 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.

(Placement process)
As shown in FIG. 3, the mounting step is a step of mounting the sealing body 3 on the jacket body 2. By the mounting step, the end surface 11a of the peripheral wall portion 11 and the back surface 3b of the sealing body 3 are abutted to form the first abutting portion J1. The first butt portion J1 is formed in a rectangular shape in a plan view along the periphery of the sealing body 3. Further, the end surface 12a of the support column 12 and the back surface 3b of the sealing body 3 are abutted to form the second abutting portion J2. The side surface 11c of the peripheral wall portion 11 and the side surface 3c of the sealing body 3 are flush with each other. The jacket body 2 and the sealing body 3 may be temporarily joined by welding, friction stir welding, or the like.

(First main joining process)
As shown in FIGS. 4, 5 and 6, 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. 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. In this embodiment, the position of the rotation tool F is fixed so as not to move relative to the friction stir device. That is, the rotating tool F is not displaced with respect to the friction stir welding device, but the jacket body 2 and the sealing body 3 side are moved with respect to the rotating tool F to perform friction stir welding.

Next, as shown in FIGS. 4 and 5, a holding step of holding the jacket body 2 and the sealing body 3 is performed, and the jacket body 2 and the sealing body 3 are held by using a holding device (jig). Then, the holding device is operated to insert the rotary tool F into the start position SP1 set on the surface 3a of the sealing body 3 to perform the friction stir welding 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.

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 also set on the surface 3a of the sealing body 3. This section is set on the surface 3a of the sealing body 3 after moving around the peripheral wall portion 11 from the intermediate point S1 and moving along the outer edge portion of the surface 3a of the sealing body 3 and passing through the intermediate point S1. It is a section up to the intermediate point S2. 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 3. 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 3 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 3 from the positions corresponding to the first butt portion J1.

In the closet section, the rotation center axis C of the rotation tool F is arranged so as to be perpendicular to the start position SP1, and the stirring pin F2 is gradually pushed in until it reaches a predetermined depth while moving relative to the intermediate point S1. go. 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. When shifting the rotation tool F from the closet section to this section, move the rotation tool F in a straight line or arc shape in a plan view so that the rotation tool F does not stop or the movement speed decreases in the middle. Is preferable.

In this section, the rotation tool F is used while maintaining a predetermined depth while keeping the rotation center axis C of the rotation tool F, the surface 3a of the sealing body 3 and the end surface 11a of the peripheral wall portion 11 perpendicular to each other. The outer edge portion of the sealing body 3 is moved relative to the outer edge portion of the surface 3a so as to go around the outer edge portion. Here, the "predetermined depth" refers to the depth at which the stirring pin F2 of the rotating tool F is inserted from the intermediate point S1 to the intermediate point S2 in this section. In the present embodiment, a predetermined depth is set so that the flat surface F3 of the stirring pin F2 of the rotating tool F is brought into contact with only the sealing body 3 and the tip surface of the protrusion F4 is brought into contact with only 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. In this section, only the stirring pin F2 is brought into contact with the peripheral wall portion 11 and the sealing body 3, and friction stirring is performed with the base end side of the stirring pin F2 exposed. When the rotation tool F reaches the intermediate point S2 by overlapping the start end and the end end of the plasticization region W1, the process shifts to the detachment section as it is. When shifting the rotation tool F from this section to the departure section, the rotation tool F is moved in a linear or arcuate shape in a plan view so that the rotation tool F does not stop or the movement speed decreases in the middle. Is preferable.

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.

(Second main joining process)
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 second butt portion J2 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, friction stir welding is performed so that the protrusion F4 at the tip of the stirring pin F2 reaches the end face 12a. In other words, while the flat surface F3 of the stirring pin F2 is in contact with only the sealing body 3 and the tip surface of the protrusion F4 is in contact with only the support column 12, only the stirring pin F2 is brought into contact with the sealing body 3 and the support column 12. Friction stirring is performed with the base end side of the stirring pin F2 exposed in the contacted state.

The insertion depth of the stirring pin F2 in the second joining step may be appropriately set. The second main joining step may be omitted.

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 cost is not required for ancillary equipment such as a device for driving the rotary tool F, and as a result, the manufacturing cost of the liquid-cooled jacket 1 can be reduced.

Further, by performing the first main joining step, the plastic fluid material wound up on the protrusion F4 is pressed by the flat surface F3, so that the friction and agitation around the protrusion F4 can be performed more reliably and the first butt portion is formed. The oxide film of J1 is surely divided. Thereby, the joint strength of the first butt portion J1 can be increased.

Further, the joining strength can be increased by performing the second joining step. Further, in the second joining step, if only the stirring pin F2 is brought into contact with the sealing body 3 and the tip surface of the protruding portion F4 is brought into contact with only the support column 12, the plastic fluid material wound up on the protruding portion F4. Is pressed by the flat surface F3, so that the friction and agitation around the protrusion F4 can be performed more reliably, and the oxide film of the second butt portion J2 is surely divided. Thereby, the joint strength of the second butt portion J2 can be increased. Further, by inserting only the rotating tool F into the jacket body 2 and the sealing body 3, the load acting on the friction stir welding device can be reduced.

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 inside the first butt portion J1, and the stirring pin F2 is gradually pushed toward the first butt portion J1 while being relatively moved. It is possible to prevent the frictional heat from becoming excessive on the one butt portion J1.

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 inside the first butt portion J1, and the stirring pin F2 is gradually pulled out from the first butt portion J1 while moving relative to the first butt portion J1. It is possible to prevent the frictional heat from becoming excessive on J1.

Further, in the first main joining step, since the start end and the end end of the plasticized region W1 on the surface 3a of the sealing body 3 are overlapped, the airtightness and the watertightness can be improved.

The first main joining step may be performed after the second main joining step. Further, in the first joining step of the present embodiment, the position of the rotating tool F is set so as not to be displaced with respect to the friction stir welding device, but the rotating tool F, the jacket body 2 and the sealing body 3 (holding device) are used. May be moved to perform friction stir welding. 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 set movement route L1. 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 14. 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 14 is formed at the tip of the strut 12. The strut step portion 14 is formed with 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 the same height as the end surface 11a of the peripheral wall portion 11.

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.

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 protruding portion 15 of the support column 12 is inserted into the hole portion 4 while the sealing body 3A is mounted on the end surface 11a of the peripheral wall portion 11. As a result, the end surface 11a of the peripheral wall portion 11 and the back surface 3b of the sealing body 3A are abutted to form the first abutting portion J1. Further, the step side surface 14b and the hole wall 4a of the hole portion 4 are abutted to form the step side surface abutting portion J12. Further, the step bottom surface 14a and the back surface 3b of the sealing body 3A are abutted to form the step bottom surface abutting portion J13. The thickness of the sealing body 3A may be appropriately set, but in the present embodiment, it is larger than the height dimension of the step side surface 14b.

The first main joining step is the same as that of the first embodiment. In the second main joining step, only 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. In the present embodiment, the flat surface F3 of the stirring pin F2 is brought into contact with the sealing body 3A and the support column 12 (protruding portion 15), and the tip surface of the protrusion F4 is brought into contact with only the support column 12 for friction stir welding. conduct. In the second main joining step, a plasticized region W2 is formed in the movement locus of the rotation tool F. In the second joining step, the insertion depth of the rotation tool F may be appropriately set.

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 according to 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. Can be done. Further, since the plate thickness of the sealing body 3A 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, in the second joining step, if only 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 of the stirring pin F2 is brought into contact with only the support column 12, the protrusion F4 can be reached. Since the rolled-up plastic fluid material is pressed by the flat surface F3, the friction and agitation around the protrusion F4 can be performed more reliably, and the oxide film of the step side surface abutting portion J12 and the step bottom surface abutting portion J13 is surely separated. .. Thereby, the joint strength of the step side surface butt portion J12 and the step bottom surface butt portion J13 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.

1 Liquid-cooled jacket 2,2A Jacket body 3,3A Encapsulant 10 Bottom 11 Peripheral wall 11a End face 22 Holding part F Rotation tool (rotation tool for joining)
F1 Connection part F2 Stirring pin F3 Flat surface F4 Protrusion part J1 First butt part J2 Second butt part J12 Step side butt part J13 Step bottom butt part SP1 Start position EP1 End position W1 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 outer peripheral surface of the stirring pin of the rotating tool used for friction stirring is inclined so as to be tapered, and the stirring pin is provided with a flat surface perpendicular to the rotation center axis of the rotating tool on the tip side, and is further flat. With protrusions protruding from the surface,
By placing the sealing body on the jacket body, the end surface of the peripheral wall portion and the back surface of the sealing body are overlapped to form a first butt portion, and the end face of the support column and the sealing body are formed. The mounting process of superimposing the back surface to form the second butt portion,
Only the stirring pin of the rotating tool was inserted from the surface of the sealing body so that the flat surface was brought into contact with only the sealing body and the tip surface of the protruding portion was brought into contact with only the peripheral wall portion. In the state, the first main joining step of frictionally agitating the first butt portion by making a relative circumference around the peripheral wall portion at a predetermined depth along the first butt portion is included.
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. Only the stirring pin of the rotating tool is inserted from the surface of the sealing body into the second abutting portion, the flat surface is brought into contact with only the sealing body, and the tip surface of the protruding portion is brought into the strut. The stirring pin is moved relative to the second butt portion at a predetermined depth in a state where only the stirring pin is in contact with the sealing body and the support column, and the second butt portion is rubbed. The method for producing a liquid-cooled jacket according to claim 1, further comprising a second joining step of stirring. 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 outer peripheral surface of the stirring pin of the rotating tool used for friction stirring is inclined so as to be tapered, and the stirring pin is provided with a flat surface perpendicular to the rotation center axis of the rotating tool on the tip side, and is further flat. With protrusions protruding from the surface,
A strut step portion having a step bottom surface and a step side surface rising from the step bottom surface is formed at the tip of the strut, and the step bottom surface of the strut is formed at the same height position as the end surface of the peripheral wall portion, and the sealing is performed. The preparatory step of forming the body thickness larger than the step side surface, and
By placing the sealing body on the jacket body, the end surface of the peripheral wall portion and the back surface of the sealing body are overlapped to form a first butt portion, and the stepped side surface of the support column and the hole portion are formed. A mounting step of forming a step side surface butt portion by abutting the hole wall and superimposing the step bottom surface of the support column and the back surface of the sealing body to form a step bottom surface butt portion.
Only the stirring pin of the rotating tool was inserted from the surface of the sealing body so that the flat surface was brought into contact with only the sealing body and the tip surface of the protruding portion was brought into contact with only the peripheral wall portion. In the state, the first main joining step of frictionally agitating the first butt portion by making a relative circumference around the peripheral wall portion at a predetermined depth along the first butt portion is included.
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. Only the stirring pin of the rotating tool is inserted from the surface of the sealing body into the step side surface abutting portion, the flat surface is brought into contact with the sealing body and the support column, and the tip surface of the protruding portion is brought into contact with the sealing body and the support column. It is characterized by further including a second joining step of frictionally stirring the step side surface butt portion by relatively moving the step side surface butt portion along the step side surface butt portion in a state of being in contact with only the support column at a predetermined depth. The method for manufacturing a liquid-cooled jacket according to claim 3. 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 stirring pin is rotated at a predetermined rotation speed to perform frictional stirring.
Claims 1 to 6 are characterized in that when the stirring pin is pulled out in the first main joining step, the rotation tool is relatively 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 any one of the above. In the first main joining step, the stirring pin is rotated at a predetermined rotation speed to perform frictional stirring.
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 relatively moved.

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