JP2021186869A - Liquid-cooled jacket manufacturing method - Google Patents

Abstract

To provide a liquid-cooled jacket manufacturing method that can manufacture the liquid-cooled jacket at low cost.SOLUTION: The liquid-cooled jacket manufacturing method includes a main jointing step in which only a stirring pin F2 of a rotating tool F is inserted into a butting part J1 and only the stirring pin F2 is made to relatively go around along the butting part J1 to friction-stir the butting part J1, with only the stirring pin F2 contacted with a peripheral wall part 11 and a sealing body 3. In the main jointing step, a jacket main body 2 and the sealing body 3 are rotated or moved parallel using a pair of holding parts 22 to friction-stir the jacket main body 2 and the sealing body 3, while making the holding parts 22 press and hold a bottom part 10 of the jacket main body 2 and a surface 3a of the sealing body 3 from both outsides thereof.SELECTED DRAWING: Figure 4

Description

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

A method for manufacturing a liquid-cooled jacket using friction stir welding is performed. 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 the jacket body is rotated around the jacket body to perform friction stir welding.

Japanese Unexamined Patent Publication No. 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 the rotating tool. It hinders the movement of. As a result, for example, it is necessary to divide the area into 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, which 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 portion and a peripheral wall portion rising from the peripheral edge of the bottom portion, and a sealing body for sealing the opening portion of the jacket body. In 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 rotary tool used in frictional stirring is inclined so as to be tapered, and the inner peripheral edge of the peripheral wall portion is formed. A preparatory step for preparing the jacket body and the sealing body having a peripheral wall step portion having a step bottom surface and a step side surface rising from the step bottom surface toward the opening, and the jacket body. By placing the sealing body on the surface, the stepped side surface of the peripheral wall portion and the side surface of the sealing body are abutted to form a butt portion, and the step bottom surface of the peripheral wall portion and the back surface of the sealing body are overlapped with each other. In a state where only the stirring pin of the rotating tool is inserted into the butt portion and only the stirring pin is brought into contact with the peripheral wall portion and the sealing body, the mounting step of forming the overlapping portion together. Including the main joining step of frictionally stirring the butt portion by making a relative circumference along the butt portion at a predetermined depth along the butt portion, and in the main joining step, the bottom portion of the jacket body and the bottom portion thereof. While pressing and holding the surface of the sealing body from both outer sides with a pair of holding portions, the jacket body and the sealing body are rotated or moved in parallel using the holding portions to rotate or parallel move the jacket body and the sealing. It is characterized by frictionally stirring with a stationary body.

According to such a manufacturing method, since the jacket body and the sealing body are rotated or translated in a state where the jacket body and the sealing body are 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 the back surface of the sealed body, and in the main joining step, the tips of at least a part of the fins of the plurality of fins are in contact with the bottom surface of the jacket body. It is preferable to frictionally stir the jacket body and the sealing body.

According to such a manufacturing method, the tip of the fin abuts on the bottom of the jacket body or the back surface of the sealing body, so that the deformation of the sealing body can be suppressed.

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 bottom surface of the step.

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 rotation tool 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 insert the pin in a rotated state and then 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 detaching 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 stirring 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.

An embodiment 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 opposite surface of 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 sealing member to be integrated.

On the end surface 11a which is the end surface of the peripheral wall portion 11, a peripheral wall step portion 14 is formed along the inner peripheral edge of the peripheral wall portion 11 of the jacket body 2. 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 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 from the surface 10a of the bottom portion 10 to the step bottom surface 14a.

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 elemental material. .. In this embodiment, a plurality of fins 31 are provided on the sealing body 3, 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 main 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, for example, by cutting a raw material.

As shown in FIG. 2, the mounting step is a step of mounting the sealing body 3 on the peripheral wall step portion 14 formed on the jacket main 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 butt 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 polymerization portion J2. The end surface 11a of the peripheral wall portion 11 and the surface 3a of the sealing body 3 are flush with each other. Further, the tip of the fin 31 abuts on or faces the surface 10a of the bottom portion 10 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 butt portion J1 using the rotation 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 outsides and held by a holding device (jig) provided with a pair of holding portions 22. In the present embodiment, an intermediate plate 21 is interposed between the holding portion 22 and the 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 are in 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 to reliably hold the jacket body 2 and the sealing body 3. 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) to which a bolt is fastened 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. At the tip of the stirring pin F2, a flat flat surface F3 (see FIG. 5) that is perpendicular to the rotation center axis C and is flat is formed.

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 toward 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 the jacket body 2 and the sealing body 3 are held by using a holding device (jig). Hold. Then, by operating the pinching device, the rotary tool F that rotates clockwise is inserted into the start position SP1 set on the butt portion J1 to perform the friction stirring step. In the friction stir welding step, friction stir welding is continuously performed between the closet section, the main section, and the detachment section.

As shown in FIG. 4, the pushing section is a section from the start position SP1 set on the butt portion J1 to the intermediate point S1 set on the butt portion J1. This section is a section from the intermediate point S1 to the intermediate point S2 set on the butt portion J1 by going around the butt portion J1. The departure section is a section from the intermediate point S2 to the end position EP1 set on the 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.

As shown in FIG. 5, in this section, a predetermined depth is maintained while 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 are perpendicular to each other. Then, the rotation tool F is relatively made to go around along the butt portion J1. Here, the "predetermined depth" means the depth at which the stirring pin F2 of the rotation 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 step bottom surface 14a. 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 the sealing body 3). Further, in the straight portion of the jacket main body 2 and the sealing body 3, the rotating 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 inserted into the butt portion J1 from the side of the surface 3a of the sealing body 3 and the end surface 11a of the peripheral wall portion 11, and only the stirring pin F2 is brought into contact with the peripheral wall portion 11 and the sealing body 3. Then, with the base end side of the stirring pin F2 exposed, the butt portion J1 is rubbed and stirred. Further, in this section, when the start end and the end point of the plasticized region W1 are overlapped and the rotation tool F reaches the intermediate point S2, the section directly shifts to the departure section. 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, the flat surface F3 at the tip of the stirring pin F2 is set to reach the step bottom surface 14a in this section, but the flat surface F3 may be set not to reach the step bottom surface 14a. In this case, the polymerization portion J2 may be joined by plastically fluidizing the stirring pin F2 with the frictional heat between the sealing body 3 and the peripheral wall portion 11.

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 while the jacket main body 2 and the sealing body 3 are held by the 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 rotary 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 the back surface 3b of the sealing body 3, and in the present joining step, at least a part of the tips of the plurality of fins 31 are attached to the bottom portion 10 of the jacket body 2. The jacket body 2 and the sealing body 3 are rubbed and agitated in the state of being in contact with each other. As a result, the tip of the fin 31 comes into contact with the bottom portion 10 of the jacket body 2, so that the deformation of the sealing body 3 can be suppressed. When a plurality of fins 31 are provided on the surface 10a of the bottom 10 of the jacket body 2, at least a part of the tips of the plurality of fins 31 are brought into contact with the back surface 3b of the sealing body 3 in this joining step. In this state, the jacket body 2 and the sealing body 3 are rubbed and stirred. As a result, the tip of the fin 31 comes into contact with 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, in the main joining step, the rotation tool F is inserted so that the flat surface (tip) F3 of the stirring pin F2 of the rotation tool F reaches the step bottom surface 14a. According to such a manufacturing method, in addition to the butt portion J1, the polymerization portion J2 is surely frictionally agitated, so that the bonding strength can be increased.

Further, by inserting only the stirring pin F2 into the jacket body 2 and the sealing body 3 and performing friction stirring with the base end side of the stirring pin F2 of the rotary tool F exposed, the load acting on the friction stirring device is applied. Can be mitigated.

Here, the rotation tool F may be vertically inserted into the start position SP1 set on the butt portion J1 to perform frictional stirring, but in this form, excessive frictional heat is generated at the start position SP1. However, there is a risk of poor joining. On the other hand, as in the present embodiment, the stirring pin F2 is gradually pushed in while being relatively moved from the start position SP1 toward the intermediate point S1, so that the frictional heat becomes excessive at one point on the butt portion J1. Can be prevented.

Similarly, the end position EP1 may be set on the 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. There is a risk of poor joining. On the other hand, by gradually pulling out the stirring pin F2 while moving it relative to the end position EP2 from the intermediate point S2 as in the present embodiment, it is possible to prevent the frictional heat from becoming excessive at one point on the butt portion J1. be able to.

Further, in this joining step, since the start end and the end end of the plasticized region W1 on the butt portion J1 are overlapped, the airtightness and the watertightness can be improved.

Further, in this joining step, the rotation speed of the rotation tool F may be constant or variable. In the intrusion 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 predetermined 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, 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 in the detachment section of the main joining step, 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. By setting as described above when the rotary tool F is pushed into or detached from the sealing body 3, the small pressing force in the indentation section or the detaching section can be supplemented by 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, for example, in the main joining step according to the present embodiment described above, the start position SP1 and the end position EP1 are provided on the butt portion J1, but the start position SP1 and the end position EP1 are provided inside or outside the butt portion J1. May be provided. Also in this case, the rotation tool F is gradually pushed in while moving the rotation tool F from the start position SP1 to the intermediate point S1 provided on the butt portion J1. Further, the rotation tool F is gradually released while moving the rotation tool F from the intermediate point S2 to the end position EP1. As a result, it is possible to prevent the frictional heat from becoming excessive on the butt portion J1 and causing poor joining. Above all, by providing the start position SP1 and the end position EP1 outside the butt portion J1, the metal material from the butt portion J1 and the polymerization portion J2 is inside the liquid-cooled jacket 1 when the rotating tool is pushed in or out. It can be prevented from leaking. Further, when moving the rotation tool F to the intermediate point S1 side or separating it from the intermediate point S2, it is preferable to set a movement route so that the movement speed of the rotation tool F does not decrease or stop.

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 Butt J2 Overlapping part 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 a cold jacket.
The outer peripheral surface of the stirring pin of the rotary tool used for friction stir is inclined so as to taper.
Preparations for preparing the jacket body and the sealing body having a peripheral wall step portion formed on the inner peripheral edge of the peripheral wall portion having a step bottom surface and a step side surface rising from the step bottom surface toward the opening. Process 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 butt portion, and the step bottom surface of the peripheral wall portion and the back surface of the sealing body portion are formed. And the mounting process to form a polymerized part by superimposing and
Only the stirring pin of the rotating tool is inserted into the butt portion, and the butt is butted at a predetermined depth along the butt portion with only the stirring pin in contact with the peripheral wall portion and the sealing body. Including the main joining step of frictionally stirring the butt portion by making a relative circumference along the portion.
In the 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 body are held by using the holding portions. A method for manufacturing a liquid-cooled jacket, which comprises rotating or translating the jacket body and frictionally stirring the jacket body and the sealing body. A plurality of fins are formed on the back surface of the sealing body.
The claim is characterized in that, in the main joining step, the jacket body and the sealing body are frictionally agitated in a state where the tips of at least a part of the fins of the plurality of fins are in contact with the bottom surface of the jacket body. Item 2. The method for manufacturing a liquid-cooled jacket according to Item 1. 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 bottom surface of the step. .. 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 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 item 1. In the main joining step, the stirring pin is rotated at a predetermined rotation speed to perform frictional stirring.
When inserting the stirring pin in the 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 stirring pin is inserted while gradually lowering the rotation speed. The method for manufacturing a liquid-cooled jacket according to any one of claims 1 to 4, wherein the liquid-cooled jacket is characterized.

Images