JP2021154300A - Method of manufacturing liquid-cooled jacket - Google Patents

Abstract

To provide a method of manufacturing a liquid-cooled jacket that can manufacture a liquid-cooled jacket at low cost.SOLUTION: The method of manufacturing a liquid-cooled jacket includes a main joining step in which only a stirring pin F2 of a rotary tool F is inserted into a surface 3a of a sealed body 3, and an outer peripheral edge part of the surface 3a of the sealed body 3 is made to relatively rotate once around a peripheral wall part 11 while contacting only the stirring pin F2 with the sealed body 3 or with the sealed body 3 and an end face 11a of the peripheral wall part 11, so as to friction-stir a first butted part J1. In the main joining step, a jacket main body 2 and the sealed body 3 are rotated or parallelly moved using a pair of holding parts 22 to friction-stir the jacket main body 2 and the sealed body 3, while making the holding parts 22 press and hold a bottom part 10 of the jacket main body 2 and the surface 3a of the sealed body 3 from respective outsides thereof.SELECTED DRAWING: Figure 4

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 rotating tool around the jacket body with the rotating tool and the side surface of the jacket body perpendicular to each other, the jig for clamping the jacket body and the sealing body is a rotating tool. It hinders the movement of. As a result, for example, it is necessary to divide the area and perform friction stir welding, which causes a problem that the work man-hours increase and the manufacturing cost increases.

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

In order to solve the above problems, the present invention comprises a jacket body having a bottom portion and a peripheral wall portion rising from the peripheral edge of the bottom portion, and a sealing body for sealing the opening of the jacket body. A method for manufacturing a liquid-cooled jacket in which the sealing body is joined by frictional stirring. The outer peripheral surface of the stirring pin of the rotating tool used in frictional stirring is inclined so as to be tapered, and the jacket body is sealed. Only the mounting step of superimposing the end surface of the peripheral wall portion and the back surface of the sealing body to form the first butt portion by mounting the stop body and the stirring pin of the rotating tool are sealed. Inserted from the surface of the stop body, with only the stirring pin in contact with the sealing body or the peripheral wall portion and the sealing body, the peripheral wall portion is inserted at a predetermined depth along the first abutting portion. In the main joining step, the bottom portion of the jacket body and the surface of the sealing body are paired from both outer sides. The jacket body and the sealing body are rotated or moved in parallel using the holding portion while being pressed and held by the holding portion of the jacket body and the sealing body. ..

According to such a manufacturing method, since the jacket body and the sealing body are rotated or translated while being held by the pair of holding portions, it is not necessary to perform the clamping operation a plurality of times. In addition, the holding portion and the rotating tool do not interfere with each other during the main joining process. 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 work man-hours can be reduced, and incidental equipment such as a device for driving the rotary tool can be simplified, and the liquid-cooled jacket can be manufactured at low cost.

Further, a plurality of fins are formed on one of the bottom portion of the jacket body and the back surface of the sealing body, and in the main joining step, the tips of at least a part of the plurality of fins are formed on the bottom portion of the jacket body. It is preferable that the jacket body and the sealing body are frictionally agitated in a state of being in contact with the other of the back surface of the sealing body.

According to such a manufacturing method, deformation of the sealing body can be suppressed by contacting the tip of the fin with the bottom of the jacket body or the back surface of the sealing body.

Further, in the main joining step, it is preferable to insert the rotating tool so that the tip of the stirring pin of the rotating tool reaches the jacket body.

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

Further, in the 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 main joining step, the rotation speed is gradually increased from the predetermined rotation speed. However, it is preferable to move the stirring pin relative to the end position.

Further, in the 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 main joining step, the stirring is performed at a speed higher than the predetermined rotation speed. It is preferable to rotate the pin and insert the stirring pin while gradually reducing the rotation speed.

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

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

It is an exploded perspective view of the liquid-cooled jacket which concerns on embodiment of this invention. It is sectional drawing which shows the mounting process of the manufacturing method of the liquid-cooled jacket which concerns on this embodiment. It is a perspective view which shows the holding process of the manufacturing method of the liquid-cooled jacket which concerns on this embodiment. It is a perspective view which shows the friction stir welding process of the manufacturing method of the liquid-cooled jacket which concerns on this embodiment. It is sectional drawing which shows the friction stir welding process of the manufacturing method of the liquid-cooled jacket which concerns on this embodiment. It is a perspective view which shows after the friction stir welding process of the manufacturing method of the liquid-cooled jacket which concerns on this embodiment.

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

As shown in FIG. 1, the liquid-cooled jacket 1 according to the present 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.

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 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.

A plurality of plate-shaped fins 31 perpendicular to the back surface 3b are formed on the back surface 3b of the sealing body 3. The height dimension of the fin 31 is substantially the same as the height dimension of the peripheral wall portion 11.

The sealing body 3 on which the fins 31 are formed may be formed by joining a plurality of fins 31 to a plate-shaped member by brazing or the like, or may be formed by cutting one raw material. .. In the present embodiment, the sealing body 3 is provided with a plurality of fins 31, but a plurality of fins 31 may be provided on the surface 10a of the bottom portion 10 of the jacket body 2. Further, the fin 31 may be omitted.

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, and a main joining step are performed.

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, cutting a raw material.

As shown in FIG. 2, 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 overlapped to form the first butt 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. The outer surface 11c of the peripheral wall portion 11 and the side surface 3c of the sealing body 3 are flush with each other in the circumferential direction. Further, the tip of the fin 31 abuts on the surface 10a of the bottom portion 10 or faces with a slight gap. 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. 3 to 6, this joining step is a step of friction stir welding the first butt portion J1 using the rotary tool F. In this joining step, a holding step and a friction stir welding step are performed. In the holding step, the jacket body 2 and the sealing 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.

As shown in FIG. 4, 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 stirring pin F2 is tapered as it is separated from the connecting portion F1. A flat flat surface F3 (see FIG. 5) that is perpendicular to the rotation center axis C and is flat is formed at the tip of the stirring pin F2.

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.

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

In this joining step, first, as shown in FIGS. 3 and 4, a holding step of holding the jacket body 2 and the sealing body 3 is performed, and then the jacket body 2 and the sealing body 3 are held by using a holding device (jig). To hold. Then, by operating the sandwiching device, the rotary tool F that rotates clockwise is inserted into the start position SP1 set on the surface 3a of the sealing body 3, and the friction stirring step is performed. 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 rotation tool F reaches the end surface 11a of the peripheral wall portion 11. 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 (jacket body 2 and sealing body 3). Further, in the straight portion of the jacket body 2 and the sealing body 3, the rotation tool F is relatively moved while the holding portion 22 (jacket main body 2 and the sealing body 3) is linearly moved.

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. 6, 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.

In the present embodiment, in this section, the flat surface F3 at the tip of the stirring pin F2 is set to reach the end surface 11a, but friction stir welding is performed with the stirring pin F2 in contact with only the sealing body 3. May be good. In this case, the first butt portion J1 is plastically fluidized and joined by the frictional heat between the stirring pin F2 and the sealing body 3.

According to the method for manufacturing a liquid-cooled jacket according to the present embodiment described above, the jacket body 2 and the sealing body 3 are rotated or parallel to each other while the jacket main body 2 and the sealing body 3 are held by a pair of holding portions 22. Since it is moved, it is not necessary to perform the clamping work multiple times. That is, after the jacket body 2 and the sealing body 3 are held by the holding portions 22 and 22, friction stir welding can be continuously performed from the start position SP1 to the end position EP1.

Further, according to the present embodiment, the holding portion 22 and the rotating tool F do not interfere with each other during the main joining process. That is, the jig for positioning the jacket body 2 and the sealing body 3 does not hinder the movement of the rotation tool F. As a result, the work man-hours can be reduced, and incidental equipment such as a device for driving the rotary tool F can be simplified, and the liquid-cooled jacket 1 can be manufactured at low cost.

Further, in the present embodiment, a plurality of fins 31 are formed on one of the bottom portion 10 of the jacket body 2 and the back surface 3b of the sealing body 3, and at least a part of the plurality of fins 31 is formed in this joining step. The jacket body 2 and the sealing body 3 are frictionally agitated with the tip end in contact with the bottom 10 of the jacket body 2 and the other of the back surface 3b of the sealing body 3. As a result, the tip of the fin 31 comes into contact with the bottom portion 10 of the jacket body 2 or the back surface 3b of the sealing body 3, so that the deformation of the sealing body 3 can be suppressed.

Further, in the present embodiment, it is preferable to insert the rotating tool F so that the flat surface (tip) F3 of the stirring pin F2 of the rotating tool F reaches the jacket body 2 in the main joining step. According to such a manufacturing method, the bonding strength 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 at a position corresponding to the first butt portion J1 on the surface 3a of the sealing body 3, and the rotation tool F may be vertically inserted to perform friction stir welding. And, excessive frictional heat is generated at the start position SP1, and there is a risk of poor joining. On the other hand, as in the present embodiment, the start position SP1 is set inside the position corresponding to the first butt portion J1 on the surface 3a of the sealing body 3, and the stirring pin F2 is set toward the first butt portion J1. By gradually pushing in while moving relative to each other, it is possible to prevent the frictional heat from becoming excessive on the first butt portion J1.

Similarly, the end position EP1 may be set at a position corresponding to the first butt portion J1 on the surface 3a of the sealing body 3, and the rotation tool F may be vertically detached at the end position EP1, but this is the embodiment. Excessive frictional heat is generated at the end position EP1 and there is a risk of poor joining. On the other hand, as in the present embodiment, the end position EP1 is set inside the position corresponding to the first butt portion J1 on the surface 3a of the sealing body 3, and the first butt portion is moved while the stirring pin F2 is relatively moved. By gradually pulling out from J1, it is possible to prevent the frictional heat from becoming excessive on the first butt portion J1.

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

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 this section. That is, at the start position SP1, the rotation speed may be set high, and the rotation speed may be gradually reduced in the closet section to shift to the main section.

Further, in the detachment section of the main joining step, if the rotation speed of the rotation tool F in this section is V2 and the rotation speed of the rotation tool F 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.

Although the embodiments of the present invention have been described above, the design can be appropriately changed within a range not contrary to the gist of the present invention. For example, in this joining step, the position of the rotary tool F is set so as not to be displaced with respect to the friction stir welding device, and the holding portions 22 and 22 (jacket body 2 and sealing body 3) are moved to perform friction stir welding. You may. Further, 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 portions 22, 22) may both be moved to perform friction stir welding. .. Further, all the fins 31 do not have to have a constant height, and at least a part of the fins 31 may be brought into contact with the front surface 10a of the bottom portion 10 or the back surface 3b of the sealing body 3.

Further, in the present embodiment, the start position SP1 and the end position EP1 are set inside the first butt portion J1, but they may be set on the surface 3a of the sealing body 3 corresponding to the first butt portion J1. .. In this case, the rotary tool F may be gradually pushed in while being relatively moved on the surface 3a of the sealing body 3 corresponding to the first butt portion J1. Further, the rotating tool F may be gradually pulled out and detached while being relatively moved on the surface 3a of the sealing body 3 corresponding to the first butt portion J1. By doing so, it is possible to prevent the frictional heat from becoming excessive at one point on the surface 3a of the sealing body 3 corresponding to the first butt portion J1.

1 Liquid-cooled jacket 2 Jacket body 3 Encapsulant 10 Bottom 11 Peripheral wall 11a End face 22 Holding F Rotating tool F2 Stirring pin J1 First butt SP1 Start position EP1 End position W1 Plasticization area

Claims (5)

A liquid that is composed of a jacket body having a bottom portion and a peripheral wall portion rising from the peripheral edge of the bottom portion and a sealing body that seals an opening of the jacket body, and joins the jacket body and the sealing body by friction stir welding. It ’s a method of manufacturing cold jackets.
The outer peripheral surface of the stirring pin of the rotary tool used for friction stir is inclined so as to be tapered.
A mounting step of forming a first butt portion by superimposing the end surface of the peripheral wall portion and the back surface of the sealing body by mounting the sealing body on the jacket body.
Only the stirring pin of the rotating tool is inserted from the surface of the sealing body, and only the stirring pin is brought into contact with the sealing body, or the peripheral wall portion and the sealing body, and the first abutment is performed. Includes a 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 portion.
In the 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 held by using the holding portions. A method for producing a liquid-cooled jacket, which comprises rotating or translating the jacket body and the sealing body for frictional stirring. A plurality of fins are formed on one of the bottom of the jacket body and the back surface of the sealing body.
In the main joining step, the jacket body and the sealing body are rubbed and stirred in a state where at least a part of the tips of the plurality of fins are in contact with the bottom of the jacket body and the other of the back surface of the sealing body. The method for manufacturing a liquid-cooled jacket according to claim 1, wherein the liquid-cooled jacket is manufactured. The method for manufacturing a liquid-cooled jacket according to claim 1 or 2, wherein in the main joining step, the rotary tool is inserted so that the tip of the stirring pin of the rotary tool reaches the jacket body. .. In the main joining step, the stirring pin is rotated at a predetermined rotation speed to perform frictional stirring.
Any of claims 1 to 3, wherein when the stirring pin is pulled out in the main joining step, the stirring pin 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 item 1. In the main joining step, the stirring pin is rotated at a predetermined rotation speed to perform frictional stirring.
The claim is characterized in that when the stirring pin is inserted in the main joining step, the stirring pin is rotated at a speed higher than the predetermined rotation speed, and the stirring pin is inserted while gradually reducing the rotation speed. The method for manufacturing a liquid-cooled jacket according to any one of 1 to 4.

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