JP2020131263A - Liquid-cooled jacket manufacturing method - Google Patents

Abstract

To provide a liquid-cooled jacket manufacturing method by which aluminum alloys of different material kinds can be satisfactorily joined.SOLUTION: This method includes a main joining process in which only a stirring pin F2 of a rotating rotary tool F is inserted in a side face 3c of an encapsulation body 3, and is caused to make one round around a side face 3c of the encapsulation body 3 at a prescribed depth along a set movement route L1, which is set on the encapsulation body 3 side with respect to a butted part J1, in the state that an outer peripheral surface of the stirring pin F2 is brought into slight contact with an end face 11a of a peripheral wall part 11, thereby frictionally stirring the butted part J1. In the main joining process, an end position EP1 is set on further a surface 3a side of the encapsulation body 3 with respect to the set movement route L1, after friction stirring joining for the butted part J1, the stirring pin F2 is gradually elevated while moving the rotary tool F to the end position EP1, and at the end point EP1, the rotary tool F is removed from the encapsulation body 3.SELECTED DRAWING: Figure 8

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. FIG. 20 is a cross-sectional view showing a conventional method for manufacturing a liquid-cooled jacket. In the conventional method for manufacturing a liquid-cooled jacket, the butt portion J10 formed by abutting the step side surface 101c provided on the step portion of the aluminum alloy jacket body 101 and the side surface 102c of the aluminum alloy sealing body 102. This is to perform friction stir welding. Further, in the conventional method for manufacturing a liquid-cooled jacket, only the stirring pin F2 of the rotating tool F is inserted into the butt portion J10 to perform friction stir welding. Further, in the conventional method for manufacturing a liquid-cooled jacket, the rotation center axis Z of the rotation tool F is overlapped with the butt portion J10 and relatively moved.

Japanese Unexamined Patent Publication No. 2015-131321

Here, the jacket body 101 tends to have a complicated shape. For example, a jacket body 101 formed of a cast material of 4000 series aluminum alloy and a relatively simple shape such as a sealing body 102 is a wrought material of 1000 series aluminum alloy. In some cases, it is formed by. In this way, a liquid-cooled jacket may be manufactured by joining members of different grades of aluminum alloy. In such a case, the jacket body 101 generally has a higher hardness than the sealing body 102. Therefore, when friction stir welding is performed as shown in FIG. 20, the stirring pin F2 becomes the sealing body 102. The material resistance received from the jacket body 101 side is larger than the material resistance received from the side. Therefore, it becomes difficult to stir different grades in a well-balanced manner by the stirring pin F2 of the rotary tool F, and there is a problem that cavity defects occur in the plasticized region after joining and the joining strength decreases.

Further, when the stirring pin F2 is separated from the butt portion J10, the stirring pin F2 is pulled out in the vertical direction, so that the frictional heat at the end position of frictional stirring becomes excessive. As a result, at the end position, the metal on the jacket body 101 side is likely to be mixed into the sealing body 102 side, which causes a problem of contributing to poor joining.

From this point of view, it is an object of the present invention to provide a method for producing a liquid-cooled jacket capable of suitably joining aluminum alloys of different grades.

In order to solve the above problems, the present invention 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 for sealing the opening of the jacket body. A method for manufacturing a liquid-cooled jacket in which the sealing body is joined by friction stir welding. The jacket body is made of a first aluminum alloy, and the sealing body is made of a second aluminum alloy. The first aluminum alloy is a grade having a higher hardness than the second aluminum alloy, and the outer peripheral surface of the stirring pin of the rotary tool used for friction stir welding is inclined so as to be tapered, and the jacket body is sealed. A mounting step of superimposing the end surface of the peripheral wall portion and the back surface of the sealing body to form a butt portion by mounting the stop body, and the sealing body of only the stirring pin of the rotating tool. With the outer peripheral surface of the stirring pin slightly in contact with the end surface of the peripheral wall portion, the stir welding pin is inserted into the side surface of the aluminum alloy, and has a predetermined depth along a set movement route set on the sealing body side of the butt portion. Including the main joining step of frictionally agitating the butt portion by making a full circle around the side surface of the sealed body, the main joining step ends further on the surface side of the sealed body than the set movement route. After setting the position and friction stir welding to the butt portion, the rotating tool is gradually raised while moving the rotating tool to the end position, and the rotating tool is separated from the sealing body at the end position. It is characterized by.

Further, the present invention 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 for sealing the opening of the jacket body, and the jacket body and the sealing body are formed. A method for manufacturing a liquid-cooled jacket that is joined by friction stir welding, wherein the jacket body is made of a first aluminum alloy, the sealant is made of a second aluminum alloy, and the first aluminum alloy is It is a grade having a higher hardness than the second aluminum alloy, and the outer peripheral surface of the stirring pin of the rotary tool used for friction stir welding is inclined so as to be tapered, and the sealing body is placed on the jacket body. As a result, only the mounting step of superimposing the end surface of the peripheral wall portion and the back surface of the sealing body to form a butt portion and the stirring pin of the rotating tool are inserted into the side surface of the sealing body. In a state where the outer peripheral surface of the stirring pin is slightly in contact with the end surface of the peripheral wall portion, the sealing body is provided with a predetermined depth along a set movement route set on the sealing body side of the butt portion. In the main joining step, the end position is set on the set movement route, and after the friction stir welding with respect to the butt portion, the main joining step is included in which the butt portion is rubbed and agitated around the side surface. The stirring pin is gradually raised while moving the rotating tool to the end position, and the rotating tool is separated from the sealing body at the end position.

According to such a manufacturing method, the second aluminum alloy mainly on the sealing body side of the butt portion is agitated and plastically fluidized by the frictional heat between the sealing body and the stirring pin, and the peripheral wall portion and the sealing body are joined at the butt portion. can do. Further, since the outer peripheral surface of the stirring pin is kept in contact with the peripheral wall portion of the jacket body slightly, it is possible to minimize the mixing of the first aluminum alloy from the jacket body to the sealing body. As a result, the second aluminum alloy on the sealing body side is mainly frictionally agitated at the butt portion, so that a decrease in joint strength can be suppressed. Further, since the stirring pin is gradually separated while moving the rotating tool, it is possible to prevent the frictional heat from becoming excessive locally. This makes it possible to prevent the first aluminum alloy of the jacket body from being mixed into the sealing body side at the end position of friction stir welding.

Further, in the main joining step, the rotation center axis of the rotation tool is inclined with respect to the end surface of the peripheral wall portion so that the outer peripheral surface of the stirring pin and the end surface of the peripheral wall portion are parallel to each other. It is preferable to perform friction stir on the set movement route.

According to such a manufacturing method, the stirring pin and the peripheral wall portion can be brought into contact with each other in a well-balanced manner.

Further, in the main joining step, the stirring pin is rotated at a predetermined rotation speed to perform friction stir welding of the butt portion, and when the stirring pin is separated in the main joining step, the rotation speed is higher than the predetermined rotation speed. It is preferable to move it to the end position while gradually increasing the rotation speed.
Further, in the main joining step, the stirring pin is rotated at a predetermined rotation speed to perform friction stir welding of the butt portion, and when the stirring pin is separated in the main joining step, the rotation speed is higher than the predetermined rotation speed. It is preferable to move the engine to the end position while gradually increasing the rotation speed.

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

Further, the present invention 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 for sealing the opening of the jacket body, and the jacket body and the sealing body are formed. A method for manufacturing a liquid-cooled jacket that is joined by friction stir welding. The jacket body is made of a second aluminum alloy, the sealant is made of a first aluminum alloy, and the first aluminum alloy is It is a grade having a higher hardness than the second aluminum alloy, and the outer peripheral surface of the stirring pin of the rotary tool used for friction stir welding is inclined so as to be tapered, and the sealing body is placed on the jacket body. As a result, 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 butt portion and the stirring pin of the rotating tool are inserted into the side surface of the jacket body. With the outer peripheral surface of the stirring pin slightly in contact with the back surface of the sealing body, the side surface of the jacket body at a predetermined depth along a set movement route set on the jacket body side of the butt portion. In the main joining step, the end position is set on the bottom side of the jacket body further than the set movement route, and the butt portion is included. After the friction stir welding with respect to the jacket body, the rotating tool is gradually raised while moving the rotating tool to the end position, and the rotating tool is separated from the jacket body at the end position.

Further, the present invention 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 for sealing the opening of the jacket body, and the jacket body and the sealing body are formed. A method for manufacturing a liquid-cooled jacket that is joined by friction stir welding. The jacket body is made of a second aluminum alloy, the sealant is made of a first aluminum alloy, and the first aluminum alloy is It is a grade having a higher hardness than the second aluminum alloy, and the outer peripheral surface of the stirring pin of the rotary tool used for friction stir welding is inclined so as to be tapered, and the sealing body is placed on the jacket body. As a result, 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 butt portion and the stirring pin of the rotating tool are inserted into the side surface of the jacket body. With the outer peripheral surface of the stirring pin slightly in contact with the back surface of the sealing body, the jacket body is provided with a predetermined depth along a set movement route set on the jacket body side of the abutting portion. In the main joining step, the end position is set on the set movement route, and after the friction stir welding with respect to the butt portion, the main joining step is included in which the butt portion is rubbed and agitated around the side surface. The stirring pin is gradually raised while moving the rotary tool to the end position, and the rotary tool is separated from the jacket body at the end position.

According to such a manufacturing method, the second aluminum alloy mainly on the jacket body side of the butt portion is agitated and plastically fluidized by the frictional heat between the jacket body and the stirring pin, and the peripheral wall portion and the sealing body are joined at the butt portion. be able to. Further, since the outer peripheral surface of the stirring pin is kept in contact with the sealing body slightly, it is possible to minimize the mixing of the first aluminum alloy from the sealing body into the jacket body. As a result, the second aluminum alloy on the jacket body side is mainly frictionally agitated at the butt portion, so that a decrease in joint strength can be suppressed. Further, since the stirring pin is gradually separated while moving the rotating tool, it is possible to prevent the frictional heat from becoming excessive locally. This makes it possible to prevent the first aluminum alloy of the sealing body from being mixed into the jacket body side at the end position of friction stir welding.

Further, in the main joining step, the rotation center axis of the rotation tool is inclined with respect to the back surface of the sealing body so that the outer peripheral surface of the stirring pin and the back surface of the sealing body are parallel to each other. It is preferable to perform friction stir welding on the set movement route in this state.

According to such a manufacturing method, the stirring pin and the sealing body can be brought into contact with each other in a well-balanced manner.

Further, in the main joining step, the stirring pin is rotated at a predetermined rotation speed to perform friction stir welding of the butt portion, and when the stirring pin is separated in the main joining step, the rotation speed is higher than the predetermined rotation speed. It is preferable to move the engine to the end position while gradually increasing the rotation speed.
Further, in the main joining step, the stirring pin is rotated at a predetermined rotation speed to perform friction stir welding of the butt portion, and when the stirring pin is separated in the main joining step, the rotation speed is higher than the predetermined rotation speed. It is preferable to move the engine to the end position while gradually increasing the rotation speed.

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

According to the method for producing a liquid-cooled jacket according to the present invention, aluminum alloys of different grades can be suitably joined.

It is an exploded perspective view which shows 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 set movement route which concerns on 1st Embodiment. It is a perspective view which shows the main joining process of the manufacturing method of the liquid-cooled jacket which concerns on 1st Embodiment. It is sectional drawing which looked at the start position in this joining process which concerns on 1st Embodiment from the side. It is sectional drawing which saw the closet section in this joining process which concerns on 1st Embodiment from the side. It is sectional drawing which looked at the vicinity of the intermediate point S1 in this joining process which concerns on 1st Embodiment from the rear in the traveling direction. It is a perspective view which shows after the completion in this joining process which concerns on 1st Embodiment. It is sectional drawing which looked at the detachment section in this joining process which concerns on 1st Embodiment from the side. It is a perspective view which shows this joining process in the manufacturing method of the liquid-cooled jacket which concerns on 2nd Embodiment of this invention. It is sectional drawing which looked at the closet section in this joining process which concerns on 2nd Embodiment from the side. It is sectional drawing which looked at the vicinity of the intermediate point S1 in this joining process which concerns on 2nd Embodiment from the rear in the traveling direction. It is a perspective view which shows after the completion in this joining process which concerns on 2nd Embodiment. It is sectional drawing which looked at the detachment section in this joining process which concerns on 2nd Embodiment from the side. It is a perspective view which shows this joining process in the manufacturing method of the liquid-cooled jacket which concerns on 3rd Embodiment of this invention. It is sectional drawing which saw this joining process which concerns on 3rd Embodiment from the rear in the traveling direction. It is a perspective view which shows after the completion of this joining process which concerns on 3rd Embodiment. It is a perspective view which shows this joining process in the manufacturing method of the liquid-cooled jacket which concerns on 4th Embodiment of this invention. It is a perspective view which shows after the completion of this joining process in the manufacturing method of the liquid-cooled jacket which concerns on 4th Embodiment. It is sectional drawing which shows the manufacturing method of the conventional liquid-cooled jacket.

[First Embodiment]
An embodiment of the present invention will be described with reference to the drawings as appropriate. 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 a heating element arranged therein. 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. In the present embodiment, the jacket body 2 is formed mainly containing a first aluminum alloy. As the first aluminum alloy, for example, an aluminum alloy casting material such as JISH5302 ADC12 (Al—Si—Cu system) is used.

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 corners of the peripheral wall portion 11 may be right angles, but in the present embodiment, round chamfering 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 a second aluminum alloy. The second aluminum alloy is a material having a lower hardness than the first aluminum alloy. The second aluminum alloy is formed of, for example, an aluminum alloy wrought material such as JIS A1050, A1100, A6063.

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, extrusion molding.

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 abutted to form the abutting portion J1. The butt portion J1 is formed in a rectangular shape in a plan view along the periphery of the sealing body 3. 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.

As shown in FIGS. 3 and 4, this joining step is a step of friction stir welding the butt portion J1 using the rotary tool F. First, the "set movement route L1" (dashed line) is set on the surface 3a side of the sealing body 3 with respect to the butt portion J1. The set movement route L1 is a movement route of the rotation tool F necessary for joining the butt portion J1 in the main joining step described later. The set movement route L1 will be described in detail later.

As shown in FIG. 4, the rotation tool F is composed of 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. The tip of the stirring pin F2 is provided with a flat flat surface F3 (see FIG. 5).

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 counterclockwise, the spiral groove is formed clockwise from the base end to the tip end. In other words, the spiral groove is formed clockwise 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 clockwise, it is preferable to form the spiral groove counterclockwise from the base end to the tip end. In other words, the spiral groove in this case is formed counterclockwise 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.

As shown in FIG. 4, in the main joining step, the closet section from the start position SP1 to the intermediate point S1, the main section from the intermediate point S1 on the set movement route L1 to the intermediate point S2, and the intermediate point S2. Three sections of the detachment section from the to the end position EP1 (see FIG. 8) are continuously friction-stir welded. The intermediate points S1 and S2 are set on the set movement route L1. The start position SP1 is set on the side surface 3c of the sealing body 3 on the surface 3a side of the sealing body 3 with respect to the set movement route L1. In the present embodiment, the angle formed by the line segment connecting the start position SP1 and the intermediate point S1 and the set movement route L1 is set to an obtuse angle.

In the closet section of the main joining step, as shown in FIGS. 5 and 6, friction stir welding is performed from the start position SP1 to the intermediate point S1. In the closet section, the stirring pin F2 rotated counterclockwise is inserted into the start position SP1 while the rotation center axis Z is perpendicular to the side surface 3c of the sealing body 3, and is moved to the intermediate point S1. At this time, as shown in FIG. 6, the stirring pin F2 is gradually pushed in so as to reach a preset "predetermined depth" by at least reaching the intermediate point S1. That is, the rotation tool F is gradually lowered while being moved to the set movement route L1 without staying in one place.

Further, in the closet section, while moving the rotation tool F, the rotation center axis Z of the rotation tool F is gradually tilted toward the sealing body 3 when viewed from the rear in the traveling direction (see FIG. 7), and is an intermediate point. When it reaches S1, the outer peripheral surface of the stirring pin F2 and the end surface 11a of the peripheral wall portion 11 are set to be parallel to each other. Further, when the intermediate point S1 is reached, the outer peripheral surface of the stirring pin F2 and the end surface 11a of the peripheral wall portion 11 are set to slightly contact each other. Then, while maintaining the inclination angle of the rotation tool F, the process shifts to the friction stir welding in this section as it is.

The contact allowance (offset amount) N between the outer peripheral surface of the stirring pin F2 and the end surface 11a of the peripheral wall portion 11 is set, for example, between 0 <N ≦ 1.0 mm, preferably between 0 <N ≦ 0.85 mm. Is set, and more preferably set between 0 <N ≦ 0.65 mm.

As shown in FIG. 7, the set movement route L1 shows a trajectory through which the center F4 of the flat surface F3 passes. That is, the set movement route L1 is set so that the end surface 11a of the peripheral wall portion 11 and the outer peripheral surface of the stirring pin F2 are made parallel to each other and slightly contact each other in the circumferential direction of the butt portion J1. In this section, the rotation tool F is moved so that the center F4 of the flat surface F3 overlaps with the set movement route L1 when viewed from above (when viewed from the side surface 11c side). The "predetermined depth" of the stirring pin F2 may be appropriately set, for example, set within a range in which the plastic fluid material does not flow into the recess 13.

If the outer peripheral surface of the stirring pin F2 and the end surface 11a of the peripheral wall portion 11 are set so as not to come into contact with each other, the joint strength of the butt portion J1 becomes low. On the other hand, when the contact allowance N between the outer peripheral surface of the stirring pin F2 and the end surface 11a of the peripheral wall portion 11 exceeds 1.0 mm, a large amount of the first aluminum alloy of the jacket body 2 is mixed into the sealing body 3 side, resulting in poor bonding. There is a risk of becoming.

In this section, the tilted state of the rotation tool F is maintained as shown in FIG. 7, and the rotation tool F is made to go around along the set movement route L1. As shown in FIG. 8, when the stirring pin F2 reaches the intermediate point S2 by rotating the rotating tool F around the rotation tool F, the rotation tool F shifts to the detachment section as it is. In the detachment section, as shown in FIG. 9, the stirring pin F2 is gradually moved upward from the intermediate point S2 to the end position EP1, and the stirring pin F2 is detached from the sealing body 3 at the end position EP1. Let me. That is, the rotation tool F is gradually pulled out while being moved to the end position EP1 without staying in one place. Further, the inclination of the rotation center axis Z of the rotation tool F is gradually returned to the original position so that the rotation center axis Z and the side surface 3c of the sealing body 3 are perpendicular to each other at the end position EP1. The end position EP1 is set at a position where the angle formed by the line segment connecting the end position EP1 and the intermediate point S2 and the set movement route L1 is an obtuse angle. A plasticized region W1 is formed in the movement locus of the rotation tool F.

According to the method for manufacturing a liquid-cooled jacket in the present embodiment described above, the second aluminum alloy mainly on the sealing body 3 side of the butt portion J1 is agitated by the frictional heat between the sealing body 3 and the stirring pin F2 to be plastic. It is fluidized, and the back surface 3b of the sealing body 3 and the end surface 11a of the peripheral wall portion 11 can be joined at the butt portion J1.

Further, since the outer peripheral surface of the stirring pin F2 is kept slightly in contact with the end surface 11a of the peripheral wall portion 11, it is possible to minimize the mixing of the first aluminum alloy from the jacket body 2 into the sealing body 3. As a result, in the butt portion J1, the second aluminum alloy on the sealing body 3 side is mainly frictionally agitated, so that a decrease in joint strength can be suppressed. That is, in this joining step, the imbalance of the material resistance received by the stirring pin F2 on one side and the other side with respect to the rotation center axis Z of the stirring pin F2 can be minimized. As a result, the plastic fluid material is frictionally agitated in a well-balanced manner, so that a decrease in joint strength can be suppressed.

Further, in the closet section of the main joining process, the set movement route is gradually pushed in until the stirring pin F2 reaches a predetermined depth while moving the rotation tool F from the start position SP1 to a position overlapping the set movement route L1. It is possible to prevent the rotation tool F from stopping on L1 and causing the frictional heat to become excessive.
Similarly, in the detachment section of the main joining step, the set movement route L1 is detached by gradually raising the stirring pin F2 from a predetermined depth while moving the rotary tool F from the set movement route L1 to the end position EP1. It is possible to prevent the rotating tool F from stopping and the frictional heat becoming excessive.
As a result, it is possible to prevent the frictional heat from becoming excessive on the set movement route L1 and excessively mixing the first aluminum alloy from the jacket body 2 to the sealing body 3 to cause poor bonding.

Further, in the main joining step, the positions of the start position SP1 and the end position EP1 may be appropriately set, but the angle formed by the start position SP1 and the set movement route L1 and the angle formed by the end position EP1 and the set movement route L1 are different. By setting the angle to be obtuse, it is possible to smoothly shift to the main section or the departure section at the intermediate points S1 and S2 without reducing the moving speed of the rotation tool F. As a result, it is possible to prevent the frictional heat from becoming excessive due to the rotation tool F stopping or the moving speed decreasing on the set movement route L1. The rotation tool F may be moved from the start position SP1 to the set movement route L1 so that the locus of the rotation tool F draws an arc when viewed from above. Similarly, the rotation tool F may be moved from the set movement route L1 to the end position EP1 so that the locus of the rotation tool F draws an arc when viewed from above.

Further, in the main joining step of the present embodiment, the rotation direction and the traveling direction of the rotation tool F may be appropriately set, but the jacket body 2 side (of the plasticized region W1 formed in the movement locus of the rotation tool F) ( The rotation direction and the traveling direction of the rotation tool F were set so that the butt portion J1 side) was on the shear side and the sealing body 3 side was on the flow side. By setting the jacket body 2 side to be the shear side, the stirring action by the stirring pin F2 around the butt portion J1 is enhanced, the temperature rise in the butt portion J1 can be expected, and the sealing body 3 and the peripheral wall in the butt portion J1. The portion 11 can be joined more reliably.

The shear side (Advancing side) means the side where the relative speed of the outer circumference of the rotating tool with respect to the jointed portion is the value obtained by adding the magnitude of the moving speed to the magnitude of the tangential velocity on the outer circumference of the rotating tool. .. On the other hand, the flow side (Retreating side) refers to the side where the relative speed of the rotating tool with respect to the jointed portion becomes low due to the rotation of the rotating tool in the direction opposite to the moving direction of the rotating tool.

Further, the first aluminum alloy of the jacket body 2 is a material having a higher hardness than the second aluminum alloy of the sealing body 3. Thereby, the durability of the liquid-cooled jacket 1 can be enhanced. Further, it is preferable that the first aluminum alloy of the jacket body 2 is an aluminum alloy casting material and the second aluminum alloy of the sealing body 3 is an aluminum alloy wrought material. By using an Al—Si—Cu-based aluminum alloy casting material such as JIS H5302 ADC12 as the first aluminum alloy, the castability, strength, machinability, etc. of the jacket body 2 can be improved. Further, by using, for example, JIS A1000 series or A6000 series as the second aluminum alloy, processability and thermal conductivity can be improved.

Further, in this joining step, since the entire circumference of the butt portion J1 can be subjected to friction stir welding, the airtightness and watertightness of the liquid-cooled jacket can be improved. Further, at the end portion of the main joining step, the detaching step is performed so that the rotation tool F completely passes through the intermediate point S1 and then heads toward the end position EP1. That is, the airtightness and watertightness can be further improved by overlapping the ends of the plasticized region W1 formed by this joining step with each other.

Further, in this joining step, since friction stir welding is performed with the base end side of the stirring pin F2 of the rotary tool F exposed, the load acting on the friction stir welding device can be reduced.

In this joining step, the rotation speed of the rotation tool F may be constant, but may be variable. In the closet 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 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. By setting as described above when the rotary tool F is pushed into the sealing body 3 or separated from the sealing body 3, the small pressing force during the pushing step or the separating step can be supplemented by the rotation speed. Therefore, friction stir welding can be preferably performed.

[Second Embodiment]
Next, a method for manufacturing a liquid-cooled jacket according to the second embodiment of the present invention will be described. The second embodiment is different from the first embodiment in that both the start position SP1 and the end position EP1 in the main joining step are set on the set movement route L1 as shown in FIGS. 10 to 13. In the second embodiment, the parts different from the first embodiment will be mainly described.

In the production of the liquid-cooled jacket according to the second embodiment, the preparation step, the mounting step, and the main joining step are performed. The preparation step and the placement step are the same as those in the first embodiment.

In this joining step, as shown in FIG. 10, the start position SP1 is set on the set movement route L1. In this joining step, the closet section from the start position SP1 to the intermediate point S1, the main section from the intermediate point S1 on the set movement route L1 to the intermediate point S2, and the intermediate point S2 to the end position EP1 (FIG. 13). The three sections of the detachment section up to (see) are continuously rubbed and agitated.

In the closet section, as shown in FIGS. 10 and 11, friction stir welding is performed from the start position SP1 to the intermediate point S1. In the closet section, the stirring pin F2 rotated counterclockwise is inserted into the start position SP1 and moved to the intermediate point S1 while the rotation center axis Z is perpendicular to the side surface 3c of the sealing body 3. At this time, the stirring pin F2 is gradually pushed in so as to reach a preset "predetermined depth" by at least reaching the intermediate point S1.

Further, in the closet section, while moving the rotation tool F, the rotation center axis Z of the rotation tool F is gradually tilted toward the sealing body 3 when viewed from the rear in the traveling direction (see FIG. 12), and is an intermediate point. When it reaches S1, the outer peripheral surface of the stirring pin F2 and the end surface 11a of the peripheral wall portion 11 are set to be parallel to each other. Further, when the intermediate point S1 is reached, the outer peripheral surface of the stirring pin F2 and the end surface 11a of the peripheral wall portion 11 are set to slightly contact each other. Then, while maintaining the inclination angle of the rotation tool F, the process shifts to the friction stir welding in this section as it is. The contact allowance (offset amount) N between the outer peripheral surface of the stirring pin F2 and the end surface 11a of the peripheral wall portion 11 and the setting of the set movement route L1 are the same as those in the first embodiment.

As shown in FIG. 13, when the stirring pin F2 reaches the intermediate point S2 by rotating the rotating tool F around the rotation tool F, the rotation tool F shifts to the leaving section as it is. In the departure section, as shown in FIG. 14, the stirring pin F2 is gradually moved upward from the intermediate point S2 to the end position EP1 and sealed at the end position EP1 set on the set movement route L1. The stirring pin F2 is separated from the stop body 3. Further, the inclination of the rotation center axis Z of the rotation tool F is gradually returned to the original position so that the rotation center axis Z and the side surface 3c of the sealing body 3 are perpendicular to each other at the end position EP1.

The liquid-cooled jacket manufacturing method according to the second embodiment described above can also achieve substantially the same effect as that of the first embodiment. The start position SP1 and the end position EP1 in the main joining step may be set on the set movement route L1 as in the second embodiment.

[Third Embodiment]
Next, a method for manufacturing the liquid-cooled jacket according to the third embodiment of the present invention will be described. The third embodiment is mainly different from the first embodiment in that the jacket body 2 is formed of a second aluminum alloy and the sealant 3 is formed of a first aluminum alloy having a hardness higher than that of the second aluminum alloy. .. In this embodiment, the differences from the first embodiment will be mainly described.

As shown in FIG. 15, in the method for manufacturing a liquid-cooled jacket according to the third embodiment, a preparation step, a mounting step, and a main joining step are performed. The preparation step and the placement step are the same as those in the first embodiment. In this joining step, the rotating tool F rotated clockwise is inserted into the start position SP2, and friction stir welding is performed with respect to the butt portion J1.

As shown in FIG. 15, in the main joining step, the closet section from the start position SP2 to the intermediate point S1 and the book from the intermediate point S1 on the set movement route L1 to the intermediate point S2 by going around the peripheral wall portion 11 The section and the three sections of the detachment section from the intermediate point S2 to the end position EP2 (see FIG. 17) are continuously frictionally agitated.

The set movement route L1 is set on the bottom 10 side of the butt portion J1. The start position SP2 is set on the side surface 11c of the peripheral wall portion 11 on the bottom 10 side of the set movement route L1. The intermediate points S1 and S2 are set on the set movement route L1. In the present embodiment, the angle formed by the line segment connecting the start position SP2 and the intermediate point S1 and the set movement route L1 is set to be an obtuse angle.

In the closet section, friction stir welding is performed from the start position SP2 to the intermediate point S1. In the closet section, while setting the rotation center axis Z so as to be perpendicular to the side surface 11c of the peripheral wall portion 11, the stirring pin F2 rotated clockwise is inserted into the start position SP2 and moved to the intermediate point S1. At this time, the stirring pin F2 is gradually pushed in so as to reach a preset "predetermined depth" by at least reaching the intermediate point S1. That is, the rotation tool F is gradually lowered while being moved to the set movement route L1 without staying in one place.

Further, in the closet section, while moving the rotation tool F, the rotation center axis Z of the rotation tool F is gradually tilted toward the bottom 10 side of the jacket body 2 when viewed from the rear in the traveling direction (see FIG. 16). When the intermediate point S1 is reached, the outer peripheral surface of the stirring pin F2 and the back surface 3b of the sealing body 3 are set to be parallel to each other. Further, when the intermediate point S1 is reached, the outer peripheral surface of the stirring pin F2 and the back surface 3b of the sealing body 3 are set to slightly contact each other. Then, while maintaining the inclination angle, the process proceeds to friction stir welding in this section as it is. The contact allowance (offset amount) N between the outer peripheral surface of the stirring pin F2 and the back surface 3b of the sealing body 3 and the setting of the set movement route L1 are the same as those in the first embodiment.

As shown in FIGS. 16 and 17, in this section, the rotation tool F is set so that the center F4 of the flat surface F3 overlaps with the set movement route L1 when viewed from above (when viewed from the side surface 11c side). Move. In the main joining step of the present embodiment, the rotation tool F is rotated clockwise so that the sealing body 3 is located on the left side in the traveling direction. That is, in this joining step, the rotation direction and the traveling direction of the rotation tool F are set so that the butt portion J1 side is the shear side.

As shown in FIG. 17, the rotation tool F is made to go around the peripheral wall portion 11, and when the stirring pin F2 passes through the intermediate point S1 and reaches the intermediate point S2, the rotation tool F shifts to the detachment section as it is. In the detachment section, the stirring pin F2 is gradually moved upward from the intermediate point S2 toward the end position EP2, and the stirring pin F2 is detached from the sealing body 3 at the end position EP2. Further, the inclination of the rotation center axis Z of the rotation tool F is gradually returned to the original position so that the rotation center axis Z and the side surface 11c of the peripheral wall portion 11 are perpendicular to each other at the end position EP2. The end position EP2 is set at a position where the angle formed by the line segment connecting the end position EP2 and the intermediate point S2 and the set movement route L1 is an obtuse angle. A plasticized region W1 is formed in the movement locus of the rotation tool F.

Also in the method for manufacturing the liquid-cooled jacket according to the third embodiment described above, substantially the same effect as that of the first embodiment can be obtained. Further, as in the third embodiment, the jacket body 2 may be formed of a second aluminum alloy, and the sealant 3 may be formed of a first aluminum alloy having a hardness higher than that of the second aluminum alloy.

[Fourth Embodiment]
Next, a method for manufacturing the liquid-cooled jacket according to the fourth embodiment of the present invention will be described. As shown in FIGS. 18 and 19, the fourth embodiment is different from the third embodiment in that the positions of the start position SP2 and the end position EP2 in the main joining step are both set on the set movement route L1. In the fourth embodiment, the parts different from the third embodiment will be mainly described.

In the production of the liquid-cooled jacket according to the fourth embodiment, the preparation step, the mounting step, and the main joining step are performed. The preparation step and the placement step are the same as those in the first embodiment. In the fourth embodiment, as in the third embodiment, the jacket body 2 is formed of a second aluminum alloy, and the sealant 3 is formed of a first aluminum alloy having a hardness higher than that of the second aluminum alloy. The set movement route L1 is set on the bottom 10 side of the butt portion J1 as in the third embodiment.

In this joining step, as shown in FIG. 18, the start position SP2 is set on the set movement route L1. In this joining process, the closet section from the start position SP2 to the intermediate point S1, the main section from the intermediate point S1 on the set movement route L1 to the intermediate point S2, and the intermediate point S2 to the end position EP2 (FIG. 19). The three sections of the detachment section up to (see) are continuously friction-stir welded.

In the closet section, as shown in FIGS. 18 and 19, friction stir welding is performed from the start position SP2 to the intermediate point S1. In the closet section, the stirring pin F2 rotated clockwise is inserted into the start position SP2 while the rotation center axis Z is perpendicular to the side surface 11c of the peripheral wall portion 11, and is moved to the intermediate point S1. At this time, the stirring pin F2 is gradually pushed in so as to reach a preset "predetermined depth" by at least reaching the intermediate point S1.

Further, in the closet section, while moving the rotation tool F, the rotation center axis Z of the rotation tool F is gradually tilted toward the peripheral wall portion 11 when viewed from the rear in the traveling direction, and when the intermediate point S1 is reached. , The outer peripheral surface of the stirring pin F2 and the back surface 3b of the sealing body 3 are set to be parallel to each other. Further, when the intermediate point S1 is reached, the outer peripheral surface of the stirring pin F2 and the back surface 3b of the sealing body 3 are set to slightly contact each other. The contact allowance (offset amount) N between the outer peripheral surface of the stirring pin F2 and the back surface 3b of the sealing body 3 and the setting of the set movement route L1 are the same as those in the third embodiment. Then, while maintaining the inclination angle, the process proceeds to friction stir welding in this section as it is.

As shown in FIG. 19, when the stirring pin F2 reaches the intermediate point S2 by rotating the rotating tool F around the rotation tool F, the rotation tool F shifts to the leaving section as it is. In the detachment section, the stirring pin F2 is gradually moved upward from the intermediate point S2 to the end position EP2, and the stirring pin F2 is moved from the peripheral wall portion 11 at the end position EP2 set on the set movement route L1. Let go. Further, the inclination of the rotation center axis Z of the rotation tool F is gradually returned to the original position so that the rotation center axis Z and the side surface 11c of the peripheral wall portion 11 are perpendicular to each other at the end position EP2.

The method for manufacturing the liquid-cooled jacket according to the fourth embodiment described above can also achieve substantially the same effect as that of the third embodiment. As in the fourth embodiment, the start position SP2 and the end position EP2 in the main joining step may be set on the set movement route L1.

1 Liquid-cooled jacket 2 Jacket body 3 Sealing body F Rotating tool F2 Stirring pin F3 Flat surface J1 Butt part SP1 Start position SP2 Start position EP1 End position EP2 End position W1 Plasticization area

Claims (12)

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 cold jacket manufacturing method.
The jacket body is made of a first aluminum alloy, the sealant is made of a second aluminum alloy, and the first aluminum alloy is a grade having a higher hardness than the second aluminum alloy.
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 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 into the side surface of the sealing body, and the outer peripheral surface of the stirring pin is slightly brought into contact with the end surface of the peripheral wall portion, and is sealed more than the butt portion. Includes a main joining step of frictionally agitating the abutting portion by making a circumference around the side surface of the sealing body at a predetermined depth along a set movement route set on the body side.
In the main joining step, the end position is set on the surface side of the sealing body further than the set movement route, and after friction stir welding with respect to the butt portion, the stirring is performed while moving the rotation tool to the end position. A method for manufacturing a liquid-cooled jacket, which comprises gradually raising a pin to separate the rotating tool from the sealing body at the end position. In the main joining step, the rotation center axis of the rotation tool is inclined with respect to the end surface of the peripheral wall portion so that the outer peripheral surface of the stirring pin and the end surface of the peripheral wall portion are parallel to each other. The method for manufacturing a liquid-cooled jacket according to claim 1, wherein friction stir welding is performed on a set movement route. In the main joining step, the stirring pin is rotated at a predetermined rotation speed to perform friction stir welding of the butt portion.
The liquid-cooled jacket according to claim 1 or 2, wherein when the stirring pin is detached in the main joining step, the stirring pin is moved to the end position while gradually increasing the rotation speed from the predetermined rotation speed. Manufacturing method. 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 cold jacket manufacturing method.
The jacket body is made of a first aluminum alloy, the sealant is made of a second aluminum alloy, and the first aluminum alloy is a grade having a higher hardness than the second aluminum alloy.
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 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 into the side surface of the sealing body, and the outer peripheral surface of the stirring pin is slightly brought into contact with the end surface of the peripheral wall portion, and is sealed more than the butt portion. Includes a main joining step of frictionally agitating the abutting portion by making a circumference around the side surface of the sealing body at a predetermined depth along a set movement route set on the body side.
In the main joining step, an end position is set on the set movement route, and after friction stir welding with respect to the butt portion, the stirring pin is gradually raised while moving the rotation tool to the end position to reach the end position. A method for manufacturing a liquid-cooled jacket, which comprises separating the rotating tool from the sealing body. In the main joining step, the rotation center axis of the rotation tool is inclined with respect to the end surface of the peripheral wall portion so that the outer peripheral surface of the stirring pin and the end surface of the peripheral wall portion are parallel to each other. The method for manufacturing a liquid-cooled jacket according to claim 4, wherein friction stir welding is performed on a set movement route. In the main joining step, the stirring pin is rotated at a predetermined rotation speed to perform friction stir welding of the butt portion.
The liquid cooling according to claim 4 or 5, wherein when the stirring pin is separated in the main joining step, the stirring pin is moved to the end position while gradually increasing the rotation speed from the predetermined rotation speed. How to make a jacket. 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 cold jacket manufacturing method.
The jacket body is made of a second aluminum alloy, the sealant is made of a first aluminum alloy, and the first aluminum alloy is a grade having a higher hardness than the second aluminum alloy.
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 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 into the side surface of the jacket body, and the outer peripheral surface of the stirring pin is slightly in contact with the back surface of the sealing body, and the jacket body is more than the butt portion. Includes a main joining step of frictionally agitating the butt portion by making a round around the side surface of the jacket body at a predetermined depth along a set movement route set on the side.
In the main joining step, the end position is set on the bottom side of the jacket body further than the set movement route, and after friction stir welding with respect to the butt portion, the stirring pin is moved to the end position while moving the rotation tool. A method for manufacturing a liquid-cooled jacket, which comprises gradually raising the temperature to separate the rotating tool from the jacket body at the end position. In the main joining step, the rotation center axis of the rotation tool is inclined with respect to the back surface of the sealing body so that the outer peripheral surface of the stirring pin and the back surface of the sealing body are parallel to each other. The method for manufacturing a liquid-cooled jacket according to claim 7, wherein friction stir welding is performed on the set movement route. In the main joining step, the stirring pin is rotated at a predetermined rotation speed to perform friction stir welding of the butt portion.
The liquid cooling according to claim 7 or 8, wherein when the stirring pin is separated in the main joining step, the stirring pin is moved to the end position while gradually increasing the rotation speed from the predetermined rotation speed. How to make a jacket. 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 cold jacket manufacturing method.
The jacket body is made of a second aluminum alloy, the sealant is made of a first aluminum alloy, and the first aluminum alloy is a grade having a higher hardness than the second aluminum alloy.
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 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.
In a state where only the stirring pin of the rotating tool is inserted into the side surface of the jacket body and the outer peripheral surface of the stirring pin is slightly in contact with the back surface of the sealing body, the jacket is more than the butt portion. Includes a main joining step of frictionally agitating the butt portion by making a round around the side surface of the jacket body at a predetermined depth along a set movement route set on the body side.
In the main joining step, an end position is set on the set movement route, and after friction stir welding with respect to the butt portion, the stirring pin is gradually raised while moving the rotation tool to the end position to reach the end position. A method for manufacturing a liquid-cooled jacket, which comprises detaching the rotating tool from the jacket body. In the main joining step, the rotation center axis of the rotation tool is inclined with respect to the back surface of the sealing body so that the outer peripheral surface of the stirring pin and the back surface of the sealing body are parallel to each other. The method for manufacturing a liquid-cooled jacket according to claim 10, wherein friction stir welding is performed on the set movement route. In the main joining step, the stirring pin is rotated at a predetermined rotation speed to perform friction stir welding of the butt portion.
The liquid cooling according to claim 10 or 11, wherein when the stirring pin is detached in the main joining step, the stirring pin is moved to the end position while gradually increasing the rotation speed from the predetermined rotation speed. How to make a jacket.

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