WO2021124594A1

WO2021124594A1 - Method for manufacturing liquid cooling jacket

Info

Publication number: WO2021124594A1
Application number: PCT/JP2020/006342
Authority: WO
Inventors: 堀　久司; 伸城瀬尾
Original assignee: 日本軽金属株式会社
Priority date: 2019-12-16
Filing date: 2020-02-18
Publication date: 2021-06-24
Also published as: CN114786862A; JPWO2021124594A1; JP7272465B2

Abstract

The present invention addresses the problem of providing a method for manufacturing a liquid cooling jacket wherein aluminum alloys of different material types can be properly bonded.　The present invention is characterized by including a main joining step in which a stirring pin (F2) of a rotating rotary tool (F) is inserted into a sealing body (3) and is made to move in a circuit around the sealing body (3) at a prescribed depth and along a set movement route (L1) set to the inside of a peripheral side surface (3c) of the sealing body (3), while a peripheral surface of the stirring pin (F2) is made to be in slight contact with a first stepped side surface (12b) of a first peripheral wall stepped section (12) and a lower end surface of a shoulder section (F1) is made to be in contact with a surface (3a) of the sealing body (3), thereby friction-stirring a first abutment section (J1), wherein during this main joining step, after the rotating stirring pin (F2) is inserted at a starting position (SP1) that is set further to the inside than the set movement route (L1), the stirring pin (F2) is gradually pressed in to a prescribed depth while the rotation center axis (C) of the rotary tool (F) is moved to a position that overlaps with the set movement route (L1).

Description

How to manufacture a liquid-cooled jacket

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

A liquid-cooled jacket using friction stir welding is being manufactured. For example, Patent Document 1 discloses a method for manufacturing a liquid-cooled jacket. FIG. 15 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 C 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. 15, 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 rotating tool F, and there is a problem that cavity defects occur in the plasticized region after joining and the joining strength decreases.

Further, as shown in FIG. 15, when the stirring pin F2 is inserted into the butt portion J10, the stirring pin F2 is pushed in in the vertical direction until it reaches a predetermined depth, so that the frictional heat at the start position of frictional stirring becomes excessive. .. As a result, at the start 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.

Further, as shown in FIG. 15, when the stirring pin F2 is separated from the butt portion J10, the stirring pin F2 is pulled out in the vertical direction from a predetermined depth, 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 manufacturing a liquid-cooled jacket capable of suitably joining aluminum alloys of different grades.

In order to solve the above problems, the first 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 an opening of the jacket body. A method for manufacturing a liquid-cooled jacket in which a jacket body and the sealing body are joined by frictional stirring. 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 rotating tool used for friction stirring includes a shoulder portion and a stirring pin hanging from the lower end of the shoulder portion. The stirring pin has a tapered taper, and has a first step bottom surface on the inner peripheral edge of the peripheral wall portion, and a first step side surface that rises so as to spread from the first step bottom surface toward the opening. A preparatory step of forming the first peripheral wall stepped portion having the above shape and forming the plate thickness of the sealing body so as to be larger than the height dimension of the first peripheral wall stepped portion, and the jacket body. By placing the sealing body, the first step side surface of the first peripheral wall step portion and the outer peripheral side surface of the sealing body are abutted to form the first abutting portion, and the first peripheral wall step portion is formed. The first step bottom surface and the back surface of the sealing body are overlapped to form a second butt portion, and the stirring pin of the rotating tool is inserted into the sealing body, and the stirring pin is formed. The outer peripheral surface of the sealing body is in contact with the surface of the sealing body while the lower end surface of the shoulder portion is in contact with the surface of the sealing body while slightly contacting the outer peripheral surface of the first peripheral wall step portion with the first step side surface of the first peripheral wall step portion. The main joining step includes a main joining step of circling around the sealing body at a predetermined depth along a set movement route set inside the side surface and rubbing and stirring the first butt portion. After inserting the rotating stirring pin into the set start position further inside the set movement route, the rotation center axis of the rotation tool is moved to a position overlapping the set movement route to the predetermined depth. It is characterized in that the stirring pin is gradually pushed in until it becomes.

According to such a manufacturing method, the second aluminum alloy mainly on the sealing body side of the first butt portion is agitated and plastically fluidized by the frictional heat between the sealing body and the stirring pin, and the first butt portion is sealed with the step side surface. It can be joined to the outer peripheral side surface of the body. Further, since the outer peripheral surface of the stirring pin is kept in contact with the side surface of the first step 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, in the first butt portion, the second aluminum alloy on the sealing body side is mainly frictionally agitated, so that a decrease in joint strength can be suppressed. In addition, by moving the rotation center axis of the rotation tool to a position that overlaps with the set movement route and gradually pushing the stirring pin until it reaches a predetermined depth, it is possible to prevent excessive frictional heat on the set movement route. be able to.

In the present invention, the preparatory step includes a second step bottom surface extending from the upper end of the first step side surface to the outside of the opening, and a second step side surface rising from the second step bottom surface toward the opening. It is preferable that the second peripheral wall step portion is further formed, and in the main joining step, the lower end surface of the shoulder portion is positioned on the bottom surface side of the second step, which is inside the side surface of the second step, and friction stirring is performed. ..

According to such a manufacturing method, the stirring pin can be inserted to a deep position while avoiding contact between the shoulder portion of the rotating tool and the peripheral wall portion.

Further, it is preferable that the predetermined depth of the main joining step is set at a position where the stirring pin slightly contacts the bottom surface of the first step of the first peripheral wall step portion.

According to such a manufacturing method, it is possible to increase the joint strength of the second butt portion while preventing the first aluminum alloy from being mixed into the sealed body as much as possible.

Further, in the main joining step, the rotation tool is rotated at a predetermined rotation speed to perform frictional stirring, and when the stirring pin is inserted in the 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 move it to the set movement route while gradually reducing the rotation speed.

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

In order to solve the above problems, the second 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 a jacket body and the sealing body are joined by frictional stirring. 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 rotating tool used for friction stirring includes a shoulder portion and a stirring pin hanging from the lower end of the shoulder portion. The stirring pin has a tapered taper, and has a first step bottom surface on the inner peripheral edge of the peripheral wall portion, and a first step side surface that rises so as to spread from the first step bottom surface toward the opening. A preparatory step of forming the first peripheral wall stepped portion having the above shape and forming the plate thickness of the sealing body so as to be larger than the height dimension of the first peripheral wall stepped portion, and the jacket body. By placing the sealing body, the first step side surface of the first peripheral wall step portion and the outer peripheral side surface of the sealing body are abutted to form the first abutting portion, and the first peripheral wall step portion is formed. The first step bottom surface and the back surface of the sealing body are overlapped to form a second butt portion, and the stirring pin of the rotating tool is inserted into the sealing body, and the stirring pin is formed. The outer peripheral surface of the sealing body is in contact with the surface of the sealing body while the lower end surface of the shoulder portion is in contact with the surface of the sealing body while slightly contacting the outer peripheral surface of the first peripheral wall step portion with the first step side surface of the first peripheral wall step portion. The main joining step includes a main joining step of circling around the sealing body at a predetermined depth along a set movement route set inside the side surface and rubbing and stirring the first butt portion. The stirring pin is inserted from the start position set on the set movement route, and the stirring pin is gradually pushed in until the predetermined depth is reached while moving in the traveling direction.

According to such a manufacturing method, the second aluminum alloy mainly on the sealing body side of the first butt portion is agitated and plastically fluidized by the frictional heat between the sealing body and the stirring pin, and the first butt portion is sealed with the step side surface. It can be joined to the outer peripheral side surface of the body. Further, since the outer peripheral surface of the stirring pin is kept in contact with the side surface of the first step 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, in the first butt portion, the second aluminum alloy on the sealing body side is mainly frictionally agitated, so that a decrease in joint strength can be suppressed. In addition, by gradually pushing the stirring pin until it reaches a predetermined depth while moving the rotation tool in the traveling direction on the set movement route, it is possible to prevent the frictional heat from becoming excessive at one point on the set movement route. it can.

In order to solve the above-mentioned problems, the third 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 a jacket body and the sealing body are 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 rotary tool used for friction stir welding includes a shoulder portion and a stirring pin hanging from the lower end of the shoulder portion. The stirring pin has a tapered taper, and has a first step bottom surface on the inner peripheral edge of the peripheral wall portion, and a first step side surface that rises so as to spread from the first step bottom surface toward the opening. A preparatory step of forming the first peripheral wall stepped portion having the above shape and forming the plate thickness of the sealing body so as to be larger than the height dimension of the first peripheral wall stepped portion, and the jacket body. By placing the sealing body, the first stepped side surface of the first peripheral wall stepped portion and the outer peripheral side surface of the sealing body are abutted to form the first abutting portion, and the first peripheral wall stepped portion is formed. The first step bottom surface and the back surface of the sealing body are overlapped to form a second butt portion, and the stirring pin of the rotating tool is inserted into the sealing body to form the second butt portion. The outer peripheral surface of the sealing body is in contact with the surface of the sealing body while the lower end surface of the shoulder portion is in contact with the surface of the sealing body while the outer peripheral surface of the first peripheral wall stepped portion is slightly in contact with the first step side surface. The main joining step includes a main joining step of circling around the sealing body at a predetermined depth along a set movement route set inside the side surface and frictionally agitating the first butt portion. In, the end position is set further inside the set movement route, and after friction stir welding with respect to the first butt portion, the stirring pin is gradually moved from the sealing body while moving the rotation tool to the end position. It is characterized in that the rotating tool is detached from the sealing body at the end position by pulling out the tool.

According to such a manufacturing method, the second aluminum alloy mainly on the sealing body side of the first butt portion is agitated and plastically fluidized by the frictional heat between the sealing body and the stirring pin, and the first butt portion is sealed with the step side surface. It can be joined to the outer peripheral side surface of the body. Further, since the outer peripheral surface of the stirring pin is kept in contact with the side surface of the first step 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, in the first butt portion, the second aluminum alloy on the sealing body side is mainly frictionally agitated, so that a decrease in joint strength can be suppressed. Further, by gradually pulling out the tip side pin while moving the rotation tool from the position overlapping with the set movement route to the inner end position, it is possible to prevent the frictional heat from becoming excessive on the set movement route.

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

In order to solve the above-mentioned problems, the fourth 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 a jacket body and the sealing body are 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 rotary tool used for friction stir welding includes a shoulder portion and a stirring pin hanging from the lower end of the shoulder portion. The stirring pin has a tapered taper, and has a first step bottom surface on the inner peripheral edge of the peripheral wall portion, and a first step side surface that rises so as to spread from the first step bottom surface toward the opening. A preparatory step of forming the first peripheral wall stepped portion having the above shape and forming the plate thickness of the sealing body so as to be larger than the height dimension of the first peripheral wall stepped portion, and the jacket body. By placing the sealing body, the first stepped side surface of the first peripheral wall stepped portion and the outer peripheral side surface of the sealing body are abutted to form the first abutting portion, and the first peripheral wall stepped portion is formed. The first step bottom surface and the back surface of the sealing body are overlapped to form a second butt portion, and the stirring pin of the rotating tool is inserted into the sealing body to form the second butt portion. The outer peripheral surface of the sealing body is in contact with the surface of the sealing body while the lower end surface of the shoulder portion is in contact with the surface of the sealing body while the outer peripheral surface of the first peripheral wall stepped portion is slightly in contact with the first step side surface. The main joining step includes a main joining step of circling around the sealing body at a predetermined depth along a set movement route set inside the side surface and frictionally agitating the first butt portion. In, after setting the end position on the set movement route and friction stir welding to the first butt portion, the stirring pin is gradually pulled out from the sealing body while moving the rotation tool to the end position. It is characterized in that the rotating tool is detached from the sealing body at the ending position.

According to such a manufacturing method, the second aluminum alloy mainly on the sealing body side of the first butt portion is agitated and plastically fluidized by the frictional heat between the sealing body and the stirring pin, and the first butt portion is sealed with the step side surface. It can be joined to the outer peripheral side surface of the body. Further, since the outer peripheral surface of the stirring pin is kept in contact with the side surface of the first step 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, in the first butt portion, the second aluminum alloy on the sealing body side is mainly frictionally agitated, so that a decrease in joint strength can be suppressed. Further, by gradually pulling out the tip side pin while moving the rotation tool on the set movement route, it is possible to prevent the frictional heat from becoming excessive at one point on the set movement route.

In the present invention, the preparatory step includes a second step bottom surface extending from the upper end of the first step side surface to the outside of the opening, and a second step side surface rising from the second step bottom surface toward the opening. A second peripheral wall step portion is further formed, and in the main joining step, the lower end surface of the shoulder portion is positioned on the bottom surface side of the second step, which is inside the side surface of the second step, and friction stirring is performed. It is preferable that the lower end surface is located closer to the bottom surface of the second step than the end surface of the peripheral wall portion to perform friction stir welding.

According to the method for manufacturing 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 top view which shows the setting movement route of the liquid-cooled jacket which concerns on 1st Embodiment. It is a top 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 shows the push-in state of the stirring pin in the main joining process of the manufacturing method of the liquid-cooled jacket which concerns on 1st Embodiment. It is sectional drawing which shows the main joining process of the manufacturing method of the liquid-cooled jacket which concerns on 1st Embodiment. It is a top 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 shows the detached state of the stirring pin in the main joining process of the manufacturing method of the liquid-cooled jacket which concerns on 1st Embodiment. It is sectional drawing which shows after the main joining process of the manufacturing method of the liquid-cooled jacket which concerns on 1st Embodiment. It is a top view which shows the present joining process of the manufacturing method of the liquid-cooled jacket which concerns on 2nd Embodiment of this invention. It is a top view which shows the main joining process of the manufacturing method of the liquid-cooled jacket which concerns on 2nd Embodiment. It is sectional drawing which shows the mounting process of the manufacturing method of the liquid-cooled jacket which concerns on 3rd Embodiment. It is sectional drawing which shows the main joining process of the manufacturing method of the liquid-cooled jacket which concerns on 3rd Embodiment. It is sectional drawing which shows after the main joining process of the manufacturing method of the liquid-cooled jacket which concerns on 3rd Embodiment. It is sectional drawing which shows the manufacturing method of the conventional liquid-cooled jacket.

[First Embodiment]
Embodiments 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 an arranged heating element. The jacket body 2 and the sealing body 3 are integrated by friction stir welding. In the following description, the "front surface" means the surface opposite to the "back surface".

The jacket body 2 is mainly composed of a bottom portion 10 and a peripheral wall portion 11. The jacket body 2 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 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. A recess 13 is formed in the bottom portion 10 and the peripheral wall portion 11. A first peripheral wall step portion 12 is formed on the inner peripheral edge of the peripheral wall portion 11. The first peripheral wall step portion 12 is composed of a first step bottom surface 12a and a first step side surface 12b that rises obliquely from the first step bottom surface 12a. As shown in FIG. 2, the inclination angle β of the first step side surface 12b may be appropriately set, but for example, in the present embodiment, it is the same as the inclination angle α of the stirring pin F2 of the rotation tool F shown in FIG. ing.

In the present embodiment, the peripheral wall step portion, the step bottom surface and the step side surface are one step at a time, but in the third embodiment, the second step portion, the second step bottom surface and the second step side surface appear. Also in this embodiment, they are referred to as "first peripheral wall step portion 12", "first step bottom surface 12a", and "first step side surface 12b".

The first step side surface 12b may be perpendicular to the first step bottom surface 12a. Further, although the jacket body 2 of the present embodiment is integrally formed, for example, the peripheral wall portion 11 may be formed as a divided structure and joined by a seal member to be integrated.

The sealing body 3 is a member that seals the opening 14 of the jacket body 2. 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 process is a process 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.

The mounting step is a step of mounting the sealing body 3 on the jacket body 2 as shown in FIG. By the mounting step, the outer peripheral side surface 3c of the sealing body 3 and the first step side surface 12b of the first peripheral wall step portion 12 are abutted to form the first abutment portion J1. Since the first step side surface 12b is inclined outward, a gap having a V-shaped cross section is formed in 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. Further, the first step bottom surface 12a of the first peripheral wall step portion 12 and the back surface 3b of the sealing body 3 are butted to form the second butted portion J2. The plate thickness of the sealing body 3 may be appropriately set, but in the present embodiment, it is larger than the height dimension of the first step side surface 12b. The surface 3a of the sealing body 3 is located above the end surface 11a of the peripheral wall portion 11 of the jacket body 2.

As shown in FIG. 3, the "set movement route L1" (dashed line) is set inside the first butt portion J1. The set movement route L1 is a movement route of the rotation tool F necessary for joining the first butt portion J1 in the main joining step described later. As will be described later, in this embodiment, since the stirring pin F2 is slightly brought into contact with the first step side surface 12b, the set movement route L1 is set in a rectangular shape in a plan view inside the outer peripheral side surface 3c of the sealing body 3. To do.

As shown in FIGS. 4, 6 and 7, this joining step is a step of friction stir welding the first butt portion J1 using the rotary tool F. As shown in FIGS. 4 and 7, in this joining step, the intrusion section from the start position SP1 to the intermediate point S1 and the intermediate point S2 around the end face from the intermediate point S1 on the set movement route L1 (see FIG. 7). This section and the three sections of the detachment section from the intermediate point S2 to the end position EP1 (see FIG. 7) are continuously frictionally agitated. The intermediate points S1 and S2 are set on the set movement route L1. The start position SP1 is set at a position inside the set movement route L1 on the surface 3a of the sealing body 3. In the present embodiment, the line segment connecting the start position SP1 and the intermediate point S1 is gradually curved along the set movement route L1 from the start position SP1 toward the intermediate point S1. The line segment connecting the start position SP1 and the intermediate point S1 may be linear. In this case, the position of the start position SP1 is set so that the angle formed by the line segment connecting the start position SP1 and the intermediate point S1 and the set movement route L1 is an obtuse angle.

As shown in FIG. 6, the rotation tool F is composed of a shoulder portion F1 and a stirring pin F2. The rotary tool F is made of, for example, tool steel. The shoulder portion F1 is a portion connected to a rotation shaft of a friction stir device (not shown). The shoulder 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 shoulder portion F1 and is coaxial with the shoulder portion F1. The stirring pin F2 is tapered as it is separated from the shoulder portion F1. A flat flat surface F3 is provided 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 rotating the rotation tool F counterclockwise, it is preferable to form the spiral groove clockwise from the base end to the tip end. In other words, the spiral groove in this case is formed clockwise when viewed from above when the spiral groove is traced from the base end to the tip end. By setting the spiral groove in this way, the metal plastically fluidized during friction stir welding is guided to the tip end side of the stirring pin F2 by the spiral groove. As a result, the amount of metal that overflows to the outside of the metal member to be joined (jacket body 2 and sealing body 3) can be reduced.

In the closet section of the main joining process, as shown in FIG. 4, friction stir welding is performed from the start position SP1 to the intermediate point S1. In the closet section, the stirring pin F2 rotated clockwise is inserted into the start position SP1 and moved to the intermediate point S1. At this time, as shown in FIG. 5 (FIG. 4 is a cross-sectional view seen from the rear side of the stirring pin F2 in the traveling direction and shows the moving state of the stirring pin F2), at least the intermediate point S1 is reached. The stirring pin F2 is gradually pushed in so as to reach the preset "predetermined depth". That is, instead of keeping the rotation tool F in one place, the rotation tool F is gradually lowered while being moved to the set movement route L1. The "predetermined depth" means the depth at which the stirring pin F2 is inserted in this section from the intermediate point S1 on the set movement route L1 to the intermediate point S2 around the end face.

When the intermediate point S1 is reached, the process shifts to friction stir welding in this section as it is. As shown in FIGS. 4 and 6, in this section, the rotation tool F is moved so that the rotation center axis C of the stirring pin F2 and the set movement route L1 overlap. At this time, since the first step side surface 12b of the jacket body 2 is inclined, it is possible to prevent the stirring pin F2 from making large contact with the jacket body 2 and to slightly contact the first step side surface 12b. In this section, the “predetermined depth” of the stirring pin F2 is set so that the flat surface F3 at the tip of the stirring pin F2 slightly contacts the step first difference bottom surface 12a. The "predetermined depth" of the stirring pin F2 may be appropriately set, and may be set, for example, at a position where the stirring pin F2 does not reach the bottom surface 12a of the first step.

In this section of the main joining process, as shown in FIG. 6, the set movement route L1 is set so that the outer peripheral surface of the stirring pin F2 slightly contacts the first step side surface 12b. At this time, at least by the contact between the outer peripheral surface of the stirring pin F2 and the peripheral wall portion 11, the first aluminum alloy on the peripheral wall portion 11 side is slightly scraped off, and the first aluminum alloy is mixed in the sealing body 3 side. When the set movement route L1 is moved at the “predetermined depth”, the lower end surface of the shoulder portion F1 of the rotation tool F comes into contact with the surface 3a of the sealing body 3. At this time, the lower end surface of the shoulder portion F1 of the rotation tool F is not in contact with the end surface 11a of the peripheral wall portion 11. Here, the contact allowance of the outer peripheral surface of the stirring pin F2 with respect to the first step side surface 12b is set to the offset amount N. As in the present embodiment, the flat surface F3 of the stirring pin F2 is inserted deeper than the first step bottom surface 12a of the first peripheral wall step portion 12, and the outer peripheral surface of the stirring pin F2 is in contact with the first step side surface 12b. The offset amount N is set between 0 <N ≦ 1.0 mm, preferably between 0 <N ≦ 0.85 mm, and more preferably between 0 <N ≦ 0.65 mm. Set.

If the outer peripheral surface of the stirring pin F2 and the first step side surface 12b are set so as not to come into contact with each other, the joint strength of the first butt portion J1 becomes low. Further, when the offset amount N between the outer peripheral surface of the stirring pin F2 and the first step side surface 12b 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.

As shown in FIG. 7, when the rotating tool F is made to go around the sealing body 3, the start end and the end end of the plasticized region W are overlapped, and when the stirring pin F2 reaches the intermediate point S2, the separation section is entered as it is. Transition. In the detachment section of the main joining step, as shown in FIG. 8, the stirring pin F2 is gradually moved upward from the intermediate point S2 to the end position EP1, and the stirring pin F2 is stirred from the sealing body 3 at the end position EP1. Detach pin F2. That is, the rotation tool F is gradually pulled out (raised) while being moved to the end position EP1 without staying in one place. The end position EP1 is curved so that the line segment connecting the end position EP1 and the intermediate point S2 gradually increases the inclination angle with the set movement route L1 from the intermediate point S2 toward the end position EP1. (See FIG. 7). The line segment connecting the end position EP1 and the intermediate point S2 may be a straight line. In this case, the position of the end position EP1 is set so that 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 W is formed in the movement locus of the rotation tool F.

As shown in FIG. 9, the plasticized region W is formed so as to extend beyond the first butt portion J1 and the second butt portion J2 and reach the jacket body 2. The plasticized region W is high on the sealing body 3 side and low on the jacket body 2 side, and an inclined surface is formed on the surface of the plasticized region W. The upper end portion of the plasticized region W on the sealing body 3 side protrudes toward the sealing body 3 at the portion where the sealing body 3 and the shoulder portion F1 are in contact with each other.

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 first butt portion J1 is stirred by the frictional heat between the sealing body 3 and the stirring pin F2. It is plastically fluidized, and the first step side surface 12b and the outer peripheral side surface 3c of the sealing body 3 can be joined at the first butt portion J1. Further, since the outer peripheral surface of the stirring pin F2 is kept slightly in contact with the first step side surface 12b of the jacket body 2, the mixing of the first aluminum alloy from the jacket body 2 into the sealing body 3 can be minimized. .. As a result, in the first 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 C 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, by increasing the plate thickness of the sealing body 3, it is possible to prevent a metal shortage at the joint portion.

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 separated by gradually raising the stirring pin F2 from a predetermined depth while moving the rotation tool F from the set movement route L1 to the end position EP1. It is possible to prevent the rotation tool F from stopping on the top and excessive frictional heat.
As a result, it is possible to prevent the frictional heat from becoming excessive on the set movement route L1 and the first aluminum alloy from being excessively mixed from the jacket body 2 to the sealing body 3 to cause poor bonding.

Further, by performing friction stir welding with the stirring pin F2 slightly in contact with the first step side surface 12b, the first butt portion J1 and the second butt portion J2 can be reliably joined. Further, since the first step side surface 12b and the stirring pin F2 are kept in slight contact with each other, it is possible to prevent the first aluminum alloy from being mixed into the sealing body 3 from the jacket body 2 as much as possible.

Further, in the main joining step, the position of the start position SP1 may be appropriately set, but the line segment (movement locus of the rotation tool F) connecting the start position SP1 and the intermediate point S1 is set from the start position SP1 to the intermediate point S1. By gradually curving along the set movement route L1 toward the direction of, the movement speed of the rotation tool F does not decrease at the intermediate point S1 and the section smoothly shifts to this section. 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.

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 W formed in the movement locus of the rotation tool F is sheer. The rotation direction and the traveling direction of the rotation tool F were set so as to be on the 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 first butt portion J1 is enhanced, and the temperature rise in the first butt portion J1 can be expected. The first step side surface 12b and the outer peripheral side surface 3c of the sealing body 3 can be more reliably joined.

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 the main joining step, since the entire circumference of the first butt portion J1 can be friction-stir welded in the main joining step, the airtightness and watertightness of the liquid-cooled jacket can be improved. Further, for example, at the end portion of the main joining step, the detaching step may be 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 each end of the start end portion and the end end portion of the plasticized region W formed by this joining step.

Further, by setting the inclination angle α of the outer peripheral surface of the stirring pin F2 and the inclination angle β of the first step side surface 12b to be the same (parallel), the inclination angle β of the first step side surface 12b is made uniform over the entire height direction. The stirring pin F2 can be brought into contact with the stirring pin F2. As a result, friction stir welding can be performed in a well-balanced manner.

Further, in this joining step, since the friction stir 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 device can be reduced.

Further, in this section of the main joining step, since the lower end surface of the shoulder portion F1 of the rotary tool F is in contact with the surface 3a of the sealing body 3, the plastic fluid material is pressed by the lower end surface of the shoulder portion F1 and sealed. It does not flow out to the surface of the stop body 3. Therefore, the plastic fluid can be flowed to the first butt portion J1 side to fill the gap, and the generation of burrs can be suppressed.

In this joining step, the rotation speed of the rotation tool F may be constant, but may be 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 between the intermediate points S1 and S2 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, if the rotation speed of the rotation tool F between the intermediate points S1 and S2 is V2 and the rotation speed of the rotation tool F at the end position EP1 is V3 in the separation section of the main joining process, V3> V2. Good. 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. The fact that the rotation speed of the rotation tool F may be changed during the push-in step or the release step is the same in this joining step and in other embodiments.

[Second Embodiment]
Next, a method for manufacturing a liquid-cooled jacket according to the second embodiment of the present invention will be described. In the second embodiment, as shown in FIGS. 10 and 11, the positions of the start position SP2 and the end position EP2 in the main joining step are different from those of the first embodiment. 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.

As shown in FIG. 10, in the main joining process of the present embodiment, the start position SP2 is set on the set movement route L1 on the upstream side of the intermediate point S1. Further, the end position EP2 is set on the set movement route L1 on the downstream side of the intermediate point S2.

In this joining process, there are three sections: a push-in section from the start position SP2 to the intermediate point S1, a main section from the intermediate point S1 to the intermediate point S2 on the set movement route L1, and a detachment section from the intermediate point S2 to the end position EP2. Friction stir welding is performed continuously in one section.

In the closet section of the first main joining process, friction stir welding is performed from the start position SP2 to the intermediate point S1 as shown in FIG. In the closet section, 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.

When the intermediate point S1 is reached, the process shifts to friction stir welding in this section as it is. As shown in FIG. 10, in this section, the rotation tool F is moved so that the rotation center axis (not shown) of the stirring pin F2 and the set movement route L1 overlap. The contact allowance between the stirring pin F2 and the first step side surface 12b and the insertion depth of the stirring pin F2 are the same as those in the first embodiment.

When the stirring pin F2 reaches the intermediate point S2, it shifts to the departure section as it is. In the detachment section, the stirring pin F2 is gradually moved upward from the intermediate point S2 toward the ending position EP2, and the stirring pin F2 is moved from the sealing body 3 at the ending position EP2 set on the set movement route L1. To leave.

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. Further, in the push-in section of the main joining step according to the second embodiment, the stirring pin F2 is gradually pushed in until the depth reaches a predetermined depth while moving the rotation tool F on the set movement route, whereby the rotation tool F is moved on the set movement route L1. It is possible to prevent the rotation tool F from stopping at one point and excessive frictional heat. Further, in the detachment section of the main joining step according to the second embodiment, the rotation tool F is moved on the set movement route and the stirring pin F2 is gradually detached, so that the rotation tool F is at one point on the set movement route L1. Can be prevented from stopping and the frictional heat becoming excessive. As in the second embodiment, the start position SP2 and the end position EP2 in the main joining step may be set on the set movement route L1.

[Third Embodiment]
Next, a method for manufacturing the liquid-cooled jacket according to the third embodiment of the present invention will be described. Also in the method for manufacturing a liquid-cooled jacket according to the present embodiment, the preparation step, the mounting step, and the main joining step are performed. The mounting process is the same as that of the first embodiment.

The third embodiment is different from the first embodiment in that, as shown in FIG. 12, in the preparation step, the second peripheral wall step portion 15 is further formed on the upper side of the first peripheral wall step portion 12 of the jacket body 2. To do. In the third embodiment, the parts different from the first embodiment will be mainly described. The second peripheral wall step portion 15 includes a second step bottom surface 15a extending from the upper end of the first step side surface 12b to the outside of the opening 14 and a second step side surface 15b rising from the second step bottom surface 15a toward the opening 14. Have. The second step bottom surface 15a is formed at a position where the bottom surface of the shoulder portion F1 does not come into contact when the stirring pin F2 of the rotation tool F is inserted to a predetermined depth. The second step side surface 15b is formed at a position where the outer peripheral surface of the shoulder portion F1 does not come into contact when the rotation tool F is moved on the set movement route L1. In the preparatory step, the jacket body 2 having the above configuration is molded by die casting, for example.

In this section of the main joining step, as shown in FIG. 13, the set movement route L1 is set so that the outer peripheral surface of the stirring pin F2 slightly contacts the first step side surface 12b. Further, in this section of the main joining step, the insertion depth is set so that the bottom surface of the shoulder portion F1 of the rotating tool F comes into contact with the surface 3a of the sealing body 3. Here, the shoulder portion F1 of the rotation tool F is located inside the second peripheral wall step portion 15 and rotates. At this time, the lower end surface of the shoulder portion F1 is located on the side of the second step bottom surface 15a, which is inside the second step side surface 15b, and is separated from the second step bottom surface 15a by a predetermined distance. , It is located near the second step side surface 15b and is not in contact with it. In this state, when the rotation tool F is made to go around the sealing body 3 along the set movement route L1, the rotation tool F shifts to the separated section. Since the separated section is the same as that of the first embodiment, the description thereof will be omitted. A plasticized region W is formed in the movement locus of the rotation tool F.

As shown in FIG. 14, the plasticized region W is formed so as to extend beyond the first butt portion J1 and the second butt portion J2 and reach the jacket body 2. The plasticized region W is high on the sealing body 3 side and low on the jacket body 2 side, and an inclined surface is formed on the surface of the plasticized region W. The upper end portion of the plasticized region W on the sealing body 3 side protrudes toward the sealing body 3 at the portion where the sealing body 3 and the shoulder portion F1 are in contact with each other. The upper end of the plasticized region W on the peripheral wall portion 11 side projects toward the peripheral wall portion 11 in the space of the second peripheral wall step portion 15.

The liquid-cooled jacket manufacturing method according to the third embodiment described above can also achieve substantially the same effect as that of the first embodiment. In particular, as in the first embodiment, since the lower end surface of the shoulder portion F1 of the rotary tool F is in contact with the surface 3a of the sealing body 3, the plastic fluid material is pressed by the lower end surface of the shoulder portion F1 and sealed. It does not flow out to the surface of the stop body 3. Therefore, the plastic fluid can be flowed to the first butt portion J1 side to fill the gap, and the generation of burrs can be suppressed.

Further, in the third embodiment, since the lower end surface of the shoulder portion F1 presses the second peripheral wall step portion 15 from above, the plastic fluid does not flow out to the surface of the peripheral wall portion 11. Therefore, the plastic fluid can be flowed to the first butt portion J1 side to fill the gap, and the generation of burrs can be suppressed. Further, since the shoulder portion F1 is not in contact with the second peripheral wall step portion 15, the rotational load of the rotating tool F is not increased. That is, by providing the second peripheral wall step portion 15, the stirring pin F2 can be inserted to a deep position while avoiding contact between the rotating tool F and the peripheral wall portion 11. Thereby, the joint strength can be increased.

Although the embodiments of the present invention have been described above, the design can be appropriately changed within a range not contrary to the gist of the present invention. In the above embodiment, the surface 3a of the sealing body 3 is located above the end surface 11a of the peripheral wall portion 11 of the jacket body 2, but the present invention is not limited to this. The surface 3a of the sealing body 3 and the end surface 11a of the peripheral wall portion 11 of the jacket body 2 may have the same height.

1 Liquid-cooled jacket 2 Jacket body 3 Sealing body 3a (of the sealing body) Surface 11 Peripheral wall part 12 First peripheral wall stepped part 12a First step bottom surface 12b First step side surface 14 Opening 15 Second peripheral wall stepped part 15a No. Two step bottom surface 15b Second step side surface F Rotation tool F1 Shoulder part F2 Stirring pin J1 First butt part J2 Second butt part L1 Set movement route SP1 Start position S1 Midpoint S2 Midpoint EP1 End position SP2 Start position EP2 End position W Plasticization region

Claims

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 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 rotary tool used for friction stir welding includes a shoulder portion and a stirring pin that hangs down from the lower end of the shoulder portion.
The stirring pin has a tapered taper.
A first peripheral wall step portion having a first step bottom surface and a first step side surface that rises so as to spread from the first step bottom surface toward the opening is formed on the inner peripheral edge of the peripheral wall portion. At the same time, a preparatory step of forming the thickness of the sealing body so as to be larger than the height dimension of the stepped portion of the first peripheral wall.
By placing the sealing body on the jacket body, the first stepped side surface of the first peripheral wall stepped portion and the outer peripheral side surface of the sealing body are abutted to form the first butt portion, and the first butt portion is formed. A mounting process in which the bottom surface of the first step of the one-round wall step portion and the back surface of the sealing body are overlapped to form the second butt portion.
The stirring pin of the rotating tool is inserted into the sealing body, and the outer peripheral surface of the stirring pin is slightly brought into contact with the first step side surface of the first peripheral wall step portion, while being under the shoulder portion. With the end face in contact with the surface of the sealing body, the sealing body is made to go around the sealing body at a predetermined depth along a set movement route set inside the outer peripheral side surface of the sealing body. Including the main joining step of rubbing and stirring the first butt portion.
In the main joining step, after inserting the rotating stirring pin into the set start position further inside the set movement route, while moving the rotation center axis of the rotation tool to a position overlapping the set movement route. A method for manufacturing a liquid-cooled jacket, which comprises gradually pushing in the stirring pin until the predetermined depth is reached.
In the preparatory step, a second peripheral wall step portion having a second step bottom surface extending from the upper end of the first step side surface to the outside of the opening and a second step side surface rising from the second step bottom surface toward the opening. Further form,
The liquid cooling according to claim 1, wherein in the main joining step, the lower end surface of the shoulder portion is positioned on the bottom surface side of the second step, which is inside the side surface of the second step, and friction stirring is performed. How to make a jacket.
Claim 1 or claim 2 is characterized in that the predetermined depth of the main joining step is set at a position where the stirring pin slightly contacts the bottom surface of the first step of the first peripheral wall step portion. The method for manufacturing a liquid-cooled jacket described in 1.
In the main joining step, the rotary tool is rotated at a predetermined rotation speed to perform friction stir welding.
When the stirring pin is inserted in the 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 moved to the set movement route while gradually reducing the rotation speed. The method for manufacturing a liquid-cooled jacket according to claim 1.
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 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 rotary tool used for friction stir welding includes a shoulder portion and a stirring pin that hangs down from the lower end of the shoulder portion.
The stirring pin has a tapered taper.
A first peripheral wall step portion having a first step bottom surface and a first step side surface that rises so as to spread from the first step bottom surface toward the opening is formed on the inner peripheral edge of the peripheral wall portion. At the same time, a preparatory step of forming the thickness of the sealing body so as to be larger than the height dimension of the stepped portion of the first peripheral wall.
By placing the sealing body on the jacket body, the first stepped side surface of the first peripheral wall stepped portion and the outer peripheral side surface of the sealing body are abutted to form the first butt portion, and the first butt portion is formed. A mounting process in which the bottom surface of the first step of the one-round wall step portion and the back surface of the sealing body are overlapped to form the second butt portion.
The stirring pin of the rotating tool is inserted into the sealing body, and the outer peripheral surface of the stirring pin is slightly brought into contact with the first step side surface of the first peripheral wall step portion, while being under the shoulder portion. With the end face in contact with the surface of the sealing body, the sealing body is made to go around the sealing body at a predetermined depth along a set movement route set inside the outer peripheral side surface of the sealing body. Including the main joining step of rubbing and stirring the first butt portion.
A liquid characterized in that the stirring pin is inserted from a start position set on the set movement route in the main joining step, and the stirring pin is gradually pushed in until the predetermined depth is reached while moving in the traveling direction. How to make a cold jacket.
In the preparatory step, a second peripheral wall step portion having a second step bottom surface extending from the upper end of the first step side surface to the outside of the opening and a second step side surface rising from the second step bottom surface toward the opening. Further form,
The liquid cooling according to claim 5, wherein in the main joining step, the lower end surface of the shoulder portion is positioned on the bottom surface side of the second step, which is inside the side surface of the second step, and friction stirring is performed. How to make a jacket.
Claim 5 or claim 6 is characterized in that the predetermined depth of the main joining step is set at a position where the stirring pin slightly contacts the bottom surface of the first step of the first peripheral wall step portion. The method for manufacturing a liquid-cooled jacket described in 1.
In the main joining step, the rotary tool is rotated at a predetermined rotation speed to perform friction stir welding.
When the stirring pin is inserted in the 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 moved to the set movement route while gradually reducing the rotation speed. The method for manufacturing a liquid-cooled jacket according to claim 5, wherein the liquid-cooled jacket is manufactured.
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 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 rotary tool used for friction stir welding includes a shoulder portion and a stirring pin that hangs down from the lower end of the shoulder portion.
The stirring pin has a tapered taper.
A first peripheral wall step portion having a first step bottom surface and a first step side surface that rises so as to spread from the first step bottom surface toward the opening is formed on the inner peripheral edge of the peripheral wall portion. At the same time, a preparatory step of forming the thickness of the sealing body so as to be larger than the height dimension of the stepped portion of the first peripheral wall.
By placing the sealing body on the jacket body, the first stepped side surface of the first peripheral wall stepped portion and the outer peripheral side surface of the sealing body are abutted to form the first butt portion, and the first butt portion is formed. A mounting process in which the bottom surface of the first step of the one-round wall step portion and the back surface of the sealing body are overlapped to form the second butt portion.
The stirring pin of the rotating tool is inserted into the sealing body, and the outer peripheral surface of the stirring pin is slightly brought into contact with the first step side surface of the first peripheral wall step portion, while being under the shoulder portion. With the end face in contact with the surface of the sealing body, the sealing body is made to go around the sealing body at a predetermined depth along a set movement route set inside the outer peripheral side surface of the sealing body. Including the main joining step of rubbing and stirring the first butt portion.
In the main joining step, the end position is set further inside than the set movement route, and after friction stir welding with respect to the first butt portion, the stirring pin is sealed while moving the rotation tool to the end position. A method for manufacturing a liquid-cooled jacket, which comprises gradually pulling out from a stationary body to separate the rotating tool from the sealing body at the end position.
In the preparatory step, a second peripheral wall step portion having a second step bottom surface extending from the upper end of the first step side surface to the outside of the opening and a second step side surface rising from the second step bottom surface toward the opening. Further form,
The liquid cooling according to claim 9, wherein in the main joining step, the lower end surface of the shoulder portion is positioned on the bottom surface side of the second step, which is inside the side surface of the second step, and friction stirring is performed. How to make a jacket.
9. or 10. The predetermined depth of the main joining step is set at a position where the stirring pin slightly contacts the bottom surface of the first step of the first peripheral wall step portion. The method for manufacturing a liquid-cooled jacket described in 1.
In the main joining step, the rotary tool is rotated at a predetermined rotation speed to perform friction stir welding.
The method for manufacturing a liquid-cooled jacket according to claim 9, 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. ..
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 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 rotary tool used for friction stir welding includes a shoulder portion and a stirring pin that hangs down from the lower end of the shoulder portion.
The stirring pin has a tapered taper.
A first peripheral wall step portion having a first step bottom surface and a first step side surface that rises so as to spread from the first step bottom surface toward the opening is formed on the inner peripheral edge of the peripheral wall portion. At the same time, a preparatory step of forming the thickness of the sealing body so as to be larger than the height dimension of the stepped portion of the first peripheral wall.
By placing the sealing body on the jacket body, the first stepped side surface of the first peripheral wall stepped portion and the outer peripheral side surface of the sealing body are abutted to form the first butt portion, and the first butt portion is formed. A mounting process in which the bottom surface of the first step of the one-round wall step portion and the back surface of the sealing body are overlapped to form the second butt portion.
The stirring pin of the rotating tool is inserted into the sealing body, and the outer peripheral surface of the stirring pin is slightly brought into contact with the first step side surface of the first peripheral wall step portion, while being under the shoulder portion. With the end face in contact with the surface of the sealing body, the sealing body is made to go around the sealing body at a predetermined depth along a set movement route set inside the outer peripheral side surface of the sealing body. Including the main joining step of rubbing and stirring the first butt portion.
In the main joining step, an end position is set on the set movement route, and after friction stir welding with respect to the first butt portion, the stirring pin is moved from the sealing body while moving the rotation tool to the end position. A method for manufacturing a liquid-cooled jacket, which comprises gradually pulling out the rotary tool from the sealing body at the end position.
In the preparatory step, a second peripheral wall step portion having a second step bottom surface extending from the upper end of the first step side surface to the outside of the opening and a second step side surface rising from the second step bottom surface toward the opening. Further form,
The liquid cooling according to claim 13, wherein in the main joining step, the lower end surface of the shoulder portion is positioned on the bottom surface side of the second step, which is inside the side surface of the second step, and friction stirring is performed. How to make a jacket.
13. Claim 13 or claim 14, wherein the predetermined depth of the main joining step is set at a position where the stirring pin slightly contacts the bottom surface of the first step of the first peripheral wall step portion. The method for manufacturing a liquid-cooled jacket described in 1.
In the main joining step, the rotary tool is rotated at a predetermined rotation speed to perform friction stir welding.
The method for manufacturing a liquid-cooled jacket according to claim 13, 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. ..