JP6828675B2 - How to manufacture a liquid-cooled jacket - Google Patents

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. 11 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. 11, 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 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, the outer peripheral surface of the stirring pin of the rotating tool F has an inclination angle, and when the rotation center axis C of the rotating tool F is inserted straight with respect to the butt portion J10, the jacket body 101 is aligned with the step side surface 101c. There is a problem that it is difficult to perform uniform joining.

From such a viewpoint, it is an object of the present invention to provide a method for producing a liquid-cooled jacket capable of suitably joining jacket bodies and sealing bodies of different grades.

In order to solve such a problem, the present invention provides a rotating tool provided with a stirring pin, which comprises a bottom portion, a jacket body having a peripheral wall portion rising from the bottom portion, and a sealing body for sealing an opening of the jacket body. A method for manufacturing a liquid-cooled jacket to be welded using the above, wherein the jacket body is formed of a first aluminum alloy, the sealant is formed of a second aluminum alloy, and the first aluminum alloy is said. It is a grade having a higher hardness than the second aluminum alloy, and the outer peripheral surface of the stirring pin is inclined so as to be tapered, and a step bottom surface and an opening from the step bottom surface to the inner peripheral edge of the peripheral wall portion. In the preparatory step of forming a stepped portion having a stepped side surface rising toward the above, the sealing body is placed on the jacket body, and the stepped side surface and the outer peripheral side surface of the sealing body are abutted to form a first abutment. A mounting step of forming a portion and superimposing the bottom surface of the step and the back surface of the sealing body to form a second butt portion, and contacting only the stirring pin of the rotating tool with the jacket body only. In the main joining step, the rotation center axis of the rotation tool is set to the peripheral wall of the jacket body, including a main joining step of performing friction stir welding by rotating the rotating tool around the first butt portion in the state of being made to rotate. Let γ be the inclination angle of the rotation center axis of the rotation tool with respect to the outer peripheral side surface of the sealing body, and α be the inclination angle of the outer peripheral surface of the stirring pin with respect to the rotation center axis. It is characterized in that the friction stir welding method is performed in the state of α.

According to such a manufacturing method, the first aluminum alloy mainly on the jacket body side of the first butt portion is agitated and plastically fluidized by the frictional heat between the jacket body and the stirring pin, and the step side surface and the sealing body are formed at the first butt portion. Can be joined to the outer peripheral side surface of. Further, since only the stirring pin is brought into contact with only the jacket body to perform frictional stirring, there is almost no mixing of the second aluminum alloy from the sealing body to the jacket body. As a result, in the first butt portion, the first aluminum alloy on the jacket body side is mainly frictionally agitated, so that a decrease in joint strength can be suppressed. Further, since the rotation center axis of the rotation tool is inclined by an inclination angle γ with respect to the step side surface, contact between the stirring pin and the sealing body can be easily avoided. Further, the inclination angle γ of the rotation center axis of the rotation tool with respect to the stepped side surface is made to match the inclination angle α of the outer peripheral surface of the stirring pin with respect to the rotation center axis, and the outer peripheral surface of the stirring pin is parallel to the outer peripheral side surface of the sealing body. Therefore, the outer peripheral surface of the stirring pin and the outer peripheral side surface of the sealing body can be brought close to each other as much as possible in the height direction while avoiding contact between the outer peripheral surface of the stirring pin and the outer peripheral side surface of the sealing body. ..

Further, the present invention is a liquid-cooled jacket that joins a bottom portion, a jacket body having a peripheral wall portion rising from the bottom portion, and a sealing body that seals an opening of the jacket body by using a rotating tool provided with a stirring pin. The jacket body is formed of a first aluminum alloy, the sealant is formed of a second aluminum alloy, and the first aluminum alloy is harder than the second aluminum alloy. It is a high grade of
The outer peripheral surface of the stirring pin is inclined so as to be tapered, and a step portion having a step bottom surface and a step side surface rising from the step bottom surface toward the opening is formed on the inner peripheral edge of the peripheral wall portion. In the preparatory step to be performed, the sealing body is placed on the jacket body, the step side surface and the outer peripheral side surface of the sealing body are abutted to form a first abutting portion, and the step bottom surface and the sealing body are formed. In the mounting step of forming a second butt portion by superimposing the back surface of the seal, only the stirring pin of the rotating tool is brought into contact with the jacket body, and the outer peripheral side surface of the sealing body is also slightly contacted. The main joining step includes a main joining step of rotating the rotating tool around the first butted portion in a contacted state to perform frictional stirring joining, and in the main joining step, the rotation central axis of the rotating tool is set to the jacket body. Let γ be the inclination angle of the rotation center axis of the rotation tool with respect to the outer peripheral side surface of the sealant, and α be the inclination angle of the outer peripheral surface of the stirring pin with respect to the rotation center axis. It is characterized in that friction stirring bonding is performed with γ = α.

According to such a manufacturing method, 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 second aluminum alloy from the sealing body into the jacket body. As a result, in the first butt portion, the first aluminum alloy on the jacket body side is mainly frictionally agitated, so that a decrease in joint strength can be suppressed. Further, the inclination angle γ of the rotation center axis of the rotation tool with respect to the stepped side surface is made to match the inclination angle α of the outer peripheral surface of the stirring pin with respect to the rotation center axis, and the outer peripheral surface of the stirring pin is parallel to the outer peripheral side surface of the sealing body. Therefore, the contact allowance between the outer peripheral surface of the stirring pin and the outer peripheral side surface of the sealing body can be made uniform over the height direction.

Further, in the present invention, a liquid for joining 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 using a rotating tool provided with a stirring pin. In a method for manufacturing a cold jacket, the jacket body is formed of a first aluminum alloy, the sealant is formed of a second aluminum alloy, and the first aluminum alloy is made of the second aluminum alloy. The stirring pin is also a grade having high hardness, and the stirring pin is provided with an outer peripheral surface that is inclined so as to be tapered, and is provided with a flat tip surface. The preparatory step of forming the stepped portion having the stepped side surface rising toward the opening, the sealing body is placed on the jacket body, and the stepped side surface and the outer peripheral side surface of the sealing body are abutted against each other. A mounting step of forming a butt portion and superimposing the bottom surface of the step and the back surface of the sealing body to form a second butt portion, and only the stirring pin of the rotating tool for the jacket body. The tip of the stirring pin is inserted deeper than the height position of the bottom surface of the step, and the outer peripheral surface of the stirring pin and the outer peripheral side surface of the sealing body are separated from each other. The main joining step of rotating the rotary tool around the butt portion to perform frictional stirring joining is included. Assuming that the inclination angle of the rotation center axis of the rotation tool with respect to the outer peripheral side surface of the sealant is γ and the inclination angle of the outer peripheral surface of the stirring pin with respect to the rotation center axis is α, friction stirring is performed with γ = α. It is characterized by performing joining.

According to such a manufacturing method, the first aluminum alloy mainly on the jacket 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, in the first butt portion, since only the stirring pin is brought into contact with only the sealing body to perform frictional stirring, there is almost no mixing of the second aluminum alloy from the sealing body to the jacket body. As a result, in the first butt portion, the first aluminum alloy on the jacket body side is mainly frictionally agitated, so that a decrease in joint strength can be suppressed. Further, since the rotation center axis of the rotation tool is tilted by an inclination angle γ with respect to the outer peripheral side surface of the sealing body, contact between the stirring pin and the sealing body can be easily avoided. Further, the inclination angle γ of the rotation center axis of the rotation tool with respect to the outer peripheral side surface of the sealing body is made to match the inclination angle α of the outer peripheral surface of the stirring pin with respect to the rotation center axis, and the outer peripheral surface of the stirring pin and the outer circumference of the sealing body are matched. Since the side surfaces are parallel to each other, the outer peripheral surface of the stirring pin and the outer peripheral side surface of the sealing body are as close as possible in the height direction while avoiding contact between the outer peripheral surface of the stirring pin and the outer peripheral side surface of the sealing body. Can be made to. Further, by inserting the tip of the stirring pin deeper than the height position of the bottom surface of the step, the entire height direction of the first butt portion can be friction-stir welded.

Further, in the present invention, a liquid for joining 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 using a rotating tool provided with a stirring pin. In a method for manufacturing a cold jacket, the jacket body is formed of a first aluminum alloy, the sealant is formed of a second aluminum alloy, and the first aluminum alloy is made of the second aluminum alloy. The stirring pin is also a grade having high hardness, and the stirring pin is provided with an outer peripheral surface that is inclined so as to be tapered and has a flat tip surface, and is provided with a step bottom surface and a step bottom surface from the step bottom surface to the inner peripheral edge of the peripheral wall portion. The preparatory step of forming the stepped portion having the stepped side surface rising toward the opening, the sealing body is placed on the jacket body, and the stepped side surface and the outer peripheral side surface of the sealing body are abutted against each other. A mounting step of forming a butt portion and superimposing the bottom surface of the step and the back surface of the sealing body to form a second butt portion, and only the stirring pin of the rotating tool is attached to the jacket body. The tip of the stirring pin of the rotating tool that is brought into contact with and rotates is inserted deeper than the height position of the bottom surface of the step, and the outer peripheral surface of the stirring pin is slightly brought into contact with the outer peripheral side surface of the sealing body. In the main joining step, the rotation center axis of the rotating tool is set to the peripheral wall of the jacket body, including a main joining step of rotating the rotating tool around the first butt portion and performing frictional agitation joining. Let γ be the inclination angle of the rotation center axis of the rotation tool with respect to the outer peripheral side surface of the sealing body, and let α be the inclination angle α of the outer peripheral surface of the stirring pin with respect to the rotation center axis. It is characterized in that the friction stirring joint is performed in this state.

According to such a manufacturing method, 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 second aluminum alloy from the sealing body into the jacket body. As a result, in the first butt portion, the first aluminum alloy on the jacket body side is mainly frictionally agitated, so that a decrease in joint strength can be suppressed. Further, the inclination angle γ of the rotation center axis of the rotation tool with respect to the outer peripheral side surface of the sealing body is made to match the inclination angle α of the outer peripheral surface of the stirring pin with respect to the rotation center axis, and the outer peripheral surface of the stirring pin and the outer circumference of the sealing body are matched. Since the side surfaces are parallel to each other, the contact allowance between the outer peripheral surface of the stirring pin and the outer peripheral side surface of the sealing body can be made uniform over the height direction. Further, by inserting the tip of the stirring pin deeper than the height position of the outer peripheral side surface of the sealing body, the entire first butt portion in the height direction can be friction-stir welded.

Further, in the preparatory step, a convex portion along the step side surface is formed on the end surface of the peripheral wall portion, and in the main joining step, friction stirring is performed with the stirring pin and the convex portion in contact with each other. preferable. According to such a manufacturing method, it is possible to prevent a metal shortage of the first butt portion by providing the convex portion.

Further, it is preferable that the plate thickness of the sealing body is larger than the height dimension of the step side surface. According to such a manufacturing method, the heat exchange efficiency with the heating element can be improved.

Further, it is preferable to provide a spiral groove on the outer peripheral surface of the stirring pin so that the length dimension of the region where the spiral groove is formed is larger than the height dimension of the step side surface. According to such a manufacturing method, the entire first butt portion in the depth direction can be reliably joined.

Further, it is preferable that the first aluminum alloy is formed of a cast material and the second aluminum alloy is formed of a wrought material.

When a counterclockwise spiral groove is engraved on the outer peripheral surface of the rotating tool from the base end to the tip, the rotating tool is rotated clockwise, and the outer peripheral surface of the rotating tool is turned right as it goes from the base end to the tip. When the surrounding spiral groove is carved, it is preferable to rotate the rotation tool counterclockwise.

According to such a manufacturing method, since the plastically fluidized metal is guided to the tip end side of the stirring pin by the spiral groove, the generation of burrs can be reduced.

Further, in the main joining step, the rotation direction of the rotation tool and the rotation direction of the rotation tool so that the jacket body side is the flow side and the sealing body side is the shear side in the plasticized region formed in the movement locus of the rotation tool. It is preferable to set the traveling direction.

According to such a manufacturing method, the sealing body side becomes the shear side, the stirring action by the stirring pin around the first butt portion is enhanced, the temperature rise at the first butt portion can be expected, and the step side surface at the first butt portion. It is possible to more reliably join the outer peripheral side surface of the sealed body.

Further, in the preparatory step, a stepped portion having a stepped bottom surface and a stepped side surface that rises diagonally from the stepped bottom surface toward the opening is formed on the inner peripheral edge of the peripheral wall portion, and the main joining is performed. In the step, it is preferable to fill the gap between the step side surface and the outer peripheral side surface of the sealing body with a plastic fluid material.

According to such a manufacturing method, when the jacket body is manufactured by die-casting, the jacket body can be easily separated from the mold by providing the inclined step side surface, and the step portion can be easily formed. Can be done. Further, the gap between the step side surface and the outer peripheral side surface of the sealing body can be filled with a plastic fluid material.

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

It is a perspective view which shows the preparation process of the manufacturing method of the liquid-cooled jacket which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the mounting process of the manufacturing method of the liquid-cooled jacket which concerns on 1st Embodiment. It is a perspective view which shows the 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 sectional drawing which shows this joining process which concerns on the modification 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 2nd 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 the main joining process of the manufacturing method of the liquid-cooled jacket which concerns on 4th Embodiment. It is sectional drawing which shows the preparation process of the manufacturing method of the liquid-cooled jacket which concerns on 5th Embodiment. It is sectional drawing which shows the main joining process of the manufacturing method of the liquid-cooled jacket which concerns on 5th Embodiment. It is sectional drawing which shows the manufacturing method of the conventional liquid-cooled jacket.

[First Embodiment]
A method for manufacturing a liquid-cooled jacket according to an embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the method for manufacturing the liquid-cooled jacket 1 according to the embodiment of the present invention is to manufacture the liquid-cooled jacket 1 by friction stir welding the jacket body 2 and the sealing body 3. The liquid-cooled jacket 1 is a member in which a heating element (not shown) is installed on the sealing body 3 and a fluid is allowed to flow inside to exchange heat with the heating element. In the following description, the "front surface" means the surface opposite to the "back surface".

The method for manufacturing a liquid-cooled jacket according to the present embodiment includes a preparation step, a mounting step, and a main joining step. The preparation step is a step of preparing the jacket body 2 and the sealing body 3. The jacket body 2 is mainly composed of a bottom portion 10 and a peripheral wall portion 11. 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.

As shown in FIG. 1, the bottom portion 10 is a plate-shaped member having a rectangular shape in a plan view. 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 step portion 12 is formed on the inner peripheral edge of the peripheral wall portion 11. The step portion 12 is composed of a step bottom surface 12a and a step side surface 12b rising from the step bottom surface 12a. As shown in FIG. 2, the step side surface 12b rises vertically from the step bottom surface 12a toward the opening. A recess 13 is formed in the bottom portion 10 and the peripheral wall portion 11. Further, on the end surface 11a of the peripheral wall portion 11, a convex portion 20 along the step side surface 12b is formed over the entire inner peripheral edge. The cross-sectional shape of the convex portion 20 is not particularly limited, but is rectangular in the present embodiment. It is preferable that the size and position of the convex portion 20 are such that a metal shortage does not occur in the first butt portion J1 after the main joining step.

The sealing body 3 is a plate-shaped member that seals the opening of the jacket body 2. The sealing body 3 has a size that allows it to be placed on the step portion 12 with almost no gap. The plate thickness of the sealing body 3 may be the same as the height dimension of the step side surface 12b, but in the present embodiment, it is larger than the height dimension of the step side surface 12b. The sealing body 3 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, A6061.

The mounting step is a step of mounting the sealing body 3 on the jacket body 2 as shown in FIG. In the mounting step, the back surface 3b of the sealing body 3 is mounted on the bottom surface 12a of the step. The step side surface 12b and the outer peripheral side surface 3c of the sealing body 3 are abutted to form the first abutting portion J1. The first butt portion J1 is a portion where the step side surface 12b and the outer peripheral side surface 3c of the sealing body 3 are in surface contact with each other, and may include a case where the first butt portion J1 is abutted with a slight gap even if the surface contact is not formed. Further, the step bottom surface 12a and the back surface 3b of the sealing body 3 are abutted to form the second abutment portion J2. In the present embodiment, when the sealing body 3 is placed, the surface 3a of the sealing body 3 is located higher than the end surface 11a of the peripheral wall portion 11.

As shown in FIGS. 3 and 4, this joining step is a step of friction-stir welding the jacket body 2 and the sealing body 3 by using the first rotation tool F. The first rotation tool F is composed of a connecting portion F1 and a stirring pin F2. The first rotation 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 friction stir device to which the first rotation tool F is connected is, for example, a robot arm having a rotation driving means such as a spindle unit at the tip, and the rotation center axis C of the first rotation tool F can be freely tilted. ..

The stirring pin F2 hangs down from the connecting portion F1 and is coaxial with the connecting portion F1. The length of the stirring pin F2 is larger than the plate thickness of the sealing body 3. The stirring pin F2 is tapered as it is separated from the connecting portion F1. As shown in FIG. 4, the tip of the stirring pin F2 is formed with a flat tip surface F3 that is perpendicular to the rotation center axis C. That is, the outer surface of the stirring pin F2 is composed of a tapered outer peripheral surface and a tip surface F3 formed at the tip. When viewed from the side, the inclination angle α formed by the rotation center axis C and the outer peripheral surface of the stirring pin F2 may be appropriately set in the range of, for example, 5 ° to 30 °.

A spiral groove is engraved on the outer peripheral surface of the stirring pin F2 over the entire length direction. In the present embodiment, in order to rotate the first rotation tool F clockwise, the spiral groove is formed counterclockwise from the proximal end side toward the distal end side. In other words, the spiral groove is formed counterclockwise when viewed from above when the spiral groove is traced from the proximal end side to the distal end side.

When the first rotation tool F is rotated counterclockwise, it is preferable to form the spiral groove clockwise from the proximal end side toward the distal end side. 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 side to the tip end side. 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. 3, when friction stir welding is performed using the first rotation tool F, the first rotation tool F rotated clockwise is inserted into the start position Sp set on the end surface 11a of the peripheral wall portion 11. It is made to rush into the one butt portion J1. In this joining step, the first rotating tool F is made to go around the sealing body 3 counterclockwise along the first butt portion J1 while bringing the stirring pin F2 into contact with the convex portion 20. A plasticized region W is formed in the movement locus of the first rotation tool F by hardening the frictionally agitated metal.

In this joining step, as shown in FIG. 4, only the stirring pin F2 rotated clockwise is diagonally inserted into the peripheral wall portion 11 of the jacket body 2, and the jacket body 2 and the sealing body 3 are separated from the connecting portion F1. Move. In other words, friction stirring is performed with the base end portion of the stirring pin F2 exposed. Further, in the main joining step of the present embodiment, friction stir welding is performed without bringing the stirring pin F2 into contact with the sealing body 3.

More specifically, in this joining step, the rotation center axis C of the first rotation tool F is inclined by an inclination angle γ to the outside of the jacket body 2 with respect to the outer peripheral side surface 3c (vertical surface) of the sealing body 3 to stir. With only the pin F2 in contact with only the jacket body 2, the pin F2 is made to go around along the first butt portion J1. Here, the vertical plane is defined as a plane composed of the traveling direction vector and the vertical direction vector of the first rotation tool F. In the present embodiment, the outer peripheral side surface 3c and the step side surface 12b of the sealing body 3 coincide with the vertical surface. The inclination angle γ for inclining the rotation center axis C of the first rotation tool F with respect to the outer peripheral side surface 3c of the sealing body 3 is the inclination angle α formed by the rotation center axis C and the outer peripheral surface of the stirring pin F2. It is the same, and the outer peripheral side surface 3c and the outer peripheral surface of the stirring pin F2 facing the outer peripheral side surface 3c are parallel. In the present embodiment, the tip surface F3 of the stirring pin F2 is also prevented from coming into contact with the sealing body 3. Further, the insertion depth of the stirring pin F2 is set so that the tip surface F3 is deeper than the height position of the step bottom surface 12a.

The "state in which only the stirring pin F2 is in contact with only the jacket body 2" means a state in which the outer surface of the stirring pin F2 is not in contact with the sealing body 3 during frictional stirring, and the stirring pin F2 The case where the distance between the outer peripheral surface of the seal and the outer peripheral side surface 3c of the sealing body 3 is zero may be included.

If the distance from the outer peripheral side surface 3c of the sealing body 3 to the outer peripheral surface of the stirring pin F2 is too long, the bonding strength of the first butt portion J1 decreases. The separation distance L from the outer peripheral side surface 3c of the sealing body 3 to the outer peripheral surface of the stirring pin F2 may be appropriately set depending on the materials of the jacket body 2 and the sealing body 3, but the outer circumference of the stirring pin F2 as in the present embodiment. When the surface is not brought into contact with the outer peripheral side surface 3c of the sealing body 3 and the tip surface F3 is inserted deeper than the height position of the step bottom surface 12a, for example, 0 ≦ L ≦ 0.5 mm is preferably set. Is preferably set to 0 ≦ L ≦ 0.3 mm.

When the first rotation tool F is made to go around the sealing body 3, the start end and the end end of the plasticized region W overlap. The first rotation tool F may be pulled out by gradually raising it on the end surface 11a of the peripheral wall portion 11 so that no pulling mark remains.

According to the method for manufacturing a liquid-cooled jacket according to the present embodiment described above, the stirring pin F2 of the first rotation tool F and the outer peripheral side surface 3c of the sealing body 3 are not in contact with each other, but the jacket body 2 and the stirring pin are not in contact with each other. The first aluminum alloy mainly on the jacket body 2 side of the first butt portion J1 is agitated and plastically fluidized by the frictional heat with F2, and the step side surface 12b and the outer peripheral side surface 3c of the sealing body 3 are formed in the first butt portion J1. Can be joined.

Further, since only the stirring pin F2 is brought into contact with only the jacket body 2 to perform frictional stirring, there is almost no mixing of the second aluminum alloy from the sealing body 3 to the jacket body 2. As a result, in the first butt portion J1, the first aluminum alloy on the jacket body 2 side is mainly frictionally agitated, so that a decrease in joint strength can be suppressed.

Further, since the rotation center axis C of the first rotation tool F is inclined at an inclination angle γ to the outside of the jacket body 2 with respect to the outer peripheral side surface 3c (lead surface) of the sealing body 3, the first butt portion J1 , Contact between the stirring pin F2 and the sealing body 3 can be easily avoided. Further, in the present embodiment, the inclination angle γ of the rotation center axis C of the first rotation tool F with respect to the outer peripheral side surface 3c of the sealing body 3 is made to match the inclination angle α of the outer peripheral surface of the stirring pin F2 with respect to the rotation center axis C. Since the outer peripheral surface of the stirring pin F2 and the outer peripheral side surface 3c of the sealing body 3 are parallel to each other, the outer peripheral surface and outer circumference of the stirring pin F2 are avoided while avoiding contact between the outer peripheral surface of the stirring pin F2 and the outer peripheral side surface 3c. The side surface 3c can be brought as close as possible to the side surface 3c in the height direction.

Further, since only the stirring pin F2 is brought into contact with only the jacket body 2 to perform friction stir welding, the material resistance received by the stirring pin F2 is imbalanced on one side and the other side of the rotation center axis C of the stirring pin F2. Can be eliminated. 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 this joining step, since friction stir welding is performed in a state where the stirring pin F2 and the convex portion 20 are in contact with each other, it is possible to prevent the metal shortage of the first butt portion J1. Further, in the main joining step, the rotation direction and the traveling direction of the first rotation tool F may be appropriately set, but the sealing body 3 side of the plasticized region W formed in the movement locus of the first rotation tool F is. The rotation direction and the traveling direction of the first rotation tool F were set so that the sheer side and the jacket body 2 side were the flow side. As a result, 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. In the first butt portion J1, the step side surface 12b and the outer peripheral side surface 3c of the sealing body 3 are expected. 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 the present embodiment, since the spiral groove is provided in the entire stirring pin F2 and the tip surface F3 of the stirring pin F2 is inserted deeper than the height position of the step bottom surface 12a, the depth of the first butt portion J1 is deep. It can be joined over the entire spiral direction. Further, the plate thickness dimension of the sealing body 3 is set to be larger than the height dimension of the step side surface 12b. As a result, the heat exchange efficiency of the heating element arranged in the sealing body 3 can be improved. Further, according to the present embodiment, since the first rotation tool F is not brought into contact with the sealing body 3, it is possible to prevent the plasticized region W from being exposed on the surface 3a of the sealing body 3.

[First modification]
Next, a first modification of the first embodiment will be described. As shown in FIG. 5, the first modification differs from the first embodiment in that the second rotation tool M is used.

The second rotation tool M is configured to include a stirring pin M2. The stirring pin M2 is composed of a main body portion M2a and a tip portion M2b. The stirring pin M2 is made of tool steel, for example. The main body M2a has a columnar shape. The tip portion M2b is tapered and is formed at the tip of the main body portion M2a. A flat tip surface M3 is formed at the tip of the tip portion M2b. A spiral groove is engraved in the tip portion M2b over the entire length direction as in the case of the first rotation tool F. The length dimension D of the region where the spiral groove is formed (the length of the slope of the region where the spiral groove is formed in the tip portion M2b of the stirring pin M2) is set to be larger than the height dimension of the step side surface 12b. Has been done.

In this joining step, friction stir welding is performed in the same manner as in the first embodiment, with only the stirring pin M2 of the second rotation tool M in contact with only the jacket body 2. The tip surface M3 of the stirring pin M2 is set to be deeper than the height position of the step bottom surface 12a.

Even in the modified example described above, the same effect as that of the first embodiment can be obtained. Further, according to the present embodiment, since a large gap can be secured between the main body portion M2a and the outer peripheral side surface 3c of the sealing body 3, the contact between the outer peripheral side surface 3c of the sealing body 3 and the main body portion M2a Can be reliably avoided. Further, the length dimension D of the region where the spiral groove is formed in the tip portion M2b (the length of the slope of the region where the spiral groove is formed in the tip portion M2b of the stirring pin M2) is set to the height of the step side surface 12b. In order to perform frictional stirring by setting the tip surface M3 of the stirring pin M2 to be deeper than the height position of the step bottom surface 12a while making it larger than the vertical dimension, the entire depth direction of the first butt portion J1 is adjusted. It can be reliably joined.

[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 present embodiment, the insertion depth of the first rotation tool F is different from that of the first embodiment. In this embodiment, a part different from the first embodiment will be described.

In this joining step, as shown in FIG. 6, the insertion depth of the stirring pin F2 is set so that the tip surface F3 of the stirring pin F2 is higher than the height position of the step bottom surface 12a. Even in this way, the same effect as that of the first embodiment can be obtained.

[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 differs from the first embodiment in that the rotating tool is slightly brought into contact with the sealing body 3, as shown in FIG. In this embodiment, the differences from the first embodiment will be mainly described.

In the main joining step according to the present embodiment, the second rotation tool M is used. In this joining step, the stirring pin M2 of the second rotation tool M is relatively moved along the first butt portion J1 and is made to go around the sealing body 3. In this joining step, the rotation center axis C of the stirring pin M2 is inclined at an inclination angle γ to the outside of the jacket body 2 with respect to the outer peripheral side surface 3c (vertical surface) of the sealing body 3. The inclination angle γ for inclining the rotation center axis C of the first rotation tool F with respect to the outer peripheral side surface 3c of the sealing body 3 is the same as the inclination angle α formed by the rotation center axis C and the outer peripheral surface of the stirring pin F2. The outer peripheral side surface 3c and the outer peripheral surface of the tip portion M2b facing the outer peripheral side surface 3c are parallel to each other. Further, the insertion depth of the stirring pin M2 is set so that the tip surface F3 is deeper than the height position of the step bottom surface 12a.

Further, in this joining step, when the stirring pin M2 is relatively moved along the first butt portion J1, the outer peripheral surface of the tip portion M2b of the stirring pin M2 is slightly brought into contact with the outer peripheral side surface 3c of the sealing body 3. Friction stir welding is performed.

Here, the contact allowance of the outer peripheral surface of the tip portion M2b of the stirring pin M2 with respect to the outer peripheral side surface 3c of the sealing body 3 is defined as the offset amount N. When the outer peripheral surface of the tip portion M2b is brought into contact with the outer peripheral side surface 3c of the sealing body 3 and the tip surface M3 of the stirring pin M2 is inserted deeper than the step bottom surface 12a as in the present embodiment, the offset amount N Is set between 0 <N ≦ 0.5 mm, preferably between 0 <N ≦ 0.25 mm.

In the conventional method for manufacturing a liquid-cooled jacket shown in FIG. 11, since the hardness of the jacket body 101 and the sealing body 102 are different, the stirring pin F2 is received by one side and the other side of the rotation center axis C. Material resistance is also very different. Therefore, the plastic fluid material is not agitated in a well-balanced manner, which causes a decrease in joint strength. However, according to the present embodiment shown in FIG. 7, since the contact allowance between the outer peripheral surface of the tip end portion M2b of the stirring pin M2 and the outer peripheral side surface 3c of the sealing body 3 is made as small as possible, the jacket from the sealing body 3 is jacketed. It is possible to minimize the mixing of the second aluminum alloy into the main body 2. Further, in the present embodiment, the inclination angle γ of the rotation center axis C of the second rotation tool M with respect to the outer peripheral side surface 3c of the sealing body 3 is set to the inclination angle of the outer peripheral surface of the tip portion M2b of the stirring pin M2 with respect to the rotation center axis C. Since the outer peripheral surface of the tip portion M2b and the outer peripheral side surface 3c of the sealing body 3 are parallel to each other in accordance with α, the contact allowance between the outer peripheral surface of the tip portion M2b and the step side surface 12b extends in the height direction. Can be uniform. As a result, in the present embodiment, the plastic fluid material is agitated in a well-balanced manner, so that a decrease in the strength of the joint can be suppressed.

[Fourth Embodiment]
Next, a method for manufacturing the liquid-cooled jacket according to the fourth embodiment of the present invention will be described. In the present embodiment, the insertion depth of the second rotation tool M is different from that in the third embodiment. In this embodiment, a part different from the third embodiment will be described.

In this joining step, as shown in FIG. 8, the insertion depth of the stirring pin M2 is set so that the tip surface M3 of the stirring pin M2 is higher than the height position of the step bottom surface 12a. Even in this way, the same effect as that of the third embodiment can be obtained.

[Fifth Embodiment]
Next, a method for manufacturing the liquid-cooled jacket according to the fifth embodiment of the present invention will be described. As shown in FIGS. 9 and 10, the present embodiment is mainly different from the other embodiments in that the step side surface 12b is inclined. In this embodiment, the differences will be mainly described.

In the preparatory step according to the present embodiment, as shown in FIG. 9, a step portion 12 having a step bottom surface 12a and a step side surface 12b inclined outward so as to expand from the step bottom surface 12a toward the opening is formed. .. A convex portion 20 along the step side surface 12b is formed on the end surface 11a of the peripheral wall portion 11. The convex portion 20 has a trapezoidal shape in cross section. The side surface of the convex portion 20 and the stepped side surface 12b are flush with each other. The first butt portion J1 is formed by abutting the outer peripheral side surface 3c of the sealing body 3 with the step side surface 12b. A gap having a V-shaped cross section is formed between the outer peripheral side surface 3c of the sealing body 3 and the step side surface 12b.

In this joining step, as shown in FIG. 10, the second rotating tool M is used to perform friction stir welding to the first butt portion J1 in the same manner as in the first embodiment. In this joining step, the tip portion M2b of the stirring pin M2 is inserted into the end surface 11a of the peripheral wall portion 11 and relatively moved along the first butt portion J1 without contacting the outer peripheral side surface 3c of the sealing body 3. That is, friction stir welding is performed in a state where the outer peripheral side surface 3c of the sealing body 3 and the outer peripheral side surface of the tip portion M2b are separated from each other. Conditions such as the inclination angle of the second rotation tool M and the separation distance L between the sealing body 3 and the tip portion M2b are the same as those in the first embodiment.

Even in this embodiment, substantially the same effect as that in the first embodiment can be obtained. Further, according to the present embodiment, since the peripheral wall portion 11 is plastically fluidized by the main joining step, the gap of the first butt portion J1 can be filled with the first aluminum alloy. Further, according to the present embodiment, the step side surface 12b is inclined outward with respect to the jacket body 2. As a result, when the jacket body 2 is manufactured by die-casting, the jacket body 2 can be easily separated from the mold by providing the inclined step side surface 12b, and the inclined step side surface 12b can be easily formed. can do. It should be noted that the provision of an inclination on the step side surface 12b as in the present embodiment can also be applied to the second to fourth embodiments. Further, by providing the convex portion 20, the gap of the first butt portion J1 can be filled.

Although the embodiments and modifications of the present invention have been described above, the design can be changed as appropriate. For example, the convex portion 20 may be omitted.

1 Liquid-cooled jacket 2 Jacket body 3 Sealing body 3c Outer peripheral side surface 12 Stepped part 12a Stepped bottom surface 12b Stepped side surface 20 Convex part F First rotation tool (rotation tool)
F1 Connection part F2 Stirring pin F3 Tip surface M Second rotation tool (rotation tool)
M2 Stirring pin J1 1st butt part J2 2nd butt part W Plasticization area

Claims (11)

A method for manufacturing a liquid-cooled jacket, in which a jacket body having a bottom portion and a peripheral wall portion rising from the bottom portion and a sealing body for sealing an opening of the jacket body are joined by using a rotating tool equipped with a stirring pin. ,
The jacket body is formed of a first aluminum alloy, the sealant is formed 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 is inclined so as to be tapered.
A preparatory step of forming a stepped portion having a stepped bottom surface and a stepped side surface rising from the stepped bottom surface toward the opening on the inner peripheral edge of the peripheral wall portion.
The sealing body is placed on the jacket body, and the side surface of the step and the outer peripheral side surface of the sealing body are abutted to form a first butt portion, and the bottom surface of the step and the back surface of the sealing body are overlapped with each other. The mounting process to form the second butt section together,
Includes a main joining step of performing friction stir welding by rotating the rotating tool around the first butted portion in a state where only the stirring pin of the rotating tool is in contact with only the jacket body.
In the main joining step, the rotation center axis of the rotation tool is inclined toward the peripheral wall portion of the jacket body, the inclination angle of the rotation center axis of the rotation tool with respect to the outer peripheral side surface of the sealing body is γ, and the stirring is performed. A method for manufacturing a liquid-cooled jacket, characterized in that a friction stirring joining method is performed in a state where γ = α, where α is the inclination angle of the outer peripheral surface of the pin with respect to the rotation center axis. A method for manufacturing a liquid-cooled jacket, in which a jacket body having a bottom portion and a peripheral wall portion rising from the bottom portion and a sealing body for sealing an opening of the jacket body are joined by using a rotating tool equipped with a stirring pin. ,
The jacket body is formed of a first aluminum alloy, the sealant is formed 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 is inclined so as to be tapered.
A preparatory step of forming a stepped portion having a stepped bottom surface and a stepped side surface rising from the stepped bottom surface toward the opening on the inner peripheral edge of the peripheral wall portion.
The sealing body is placed on the jacket body, and the side surface of the step and the outer peripheral side surface of the sealing body are abutted to form a first butt portion, and the bottom surface of the step and the back surface of the sealing body are overlapped with each other. The mounting process to form the second butt section together,
The rotating tool is made to go around the first abutting portion in a state where only the stirring pin of the rotating tool is brought into contact with the jacket body and slightly contacted with the outer peripheral side surface of the encapsulant. Including the main joining process of performing friction stir welding
In the main joining step, the rotation center axis of the rotation tool is inclined toward the peripheral wall portion of the jacket body, the inclination angle of the rotation center axis of the rotation tool with respect to the outer peripheral side surface of the sealing body is γ, and the stirring is performed. A method for manufacturing a liquid-cooled jacket, characterized in that friction-stirring joining is performed with γ = α, where α is the inclination angle of the outer peripheral surface of the pin with respect to the rotation center axis. A method for manufacturing a liquid-cooled jacket in which 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 are joined by using a rotating tool equipped with a stirring pin. There,
The jacket body is formed of a first aluminum alloy, the sealant is formed of a second aluminum alloy, and the first aluminum alloy is a grade having a higher hardness than the second aluminum alloy.
The stirring pin has an outer peripheral surface that is inclined so as to be tapered, and has a flat tip surface.
A preparatory step of forming a stepped portion having a stepped bottom surface and a stepped side surface rising from the stepped bottom surface toward the opening on the inner peripheral edge of the peripheral wall portion.
The sealing body is placed on the jacket body, and the side surface of the step and the outer peripheral side surface of the sealing body are abutted to form a first butt portion, and the bottom surface of the step and the back surface of the sealing body are overlapped with each other. The mounting process to form the second butt section together,
Only the stirring pin of the rotating tool is brought into contact with only the jacket body, the tip of the stirring pin is inserted deeper than the height position of the bottom surface of the step, and the outer peripheral surface of the stirring pin is sealed. Includes a main joining step of performing friction stir welding by rotating a rotating tool around the first abutting portion while being separated from the outer peripheral side surface of the body.
In the main joining step, the rotation center axis of the rotation tool is inclined toward the peripheral wall portion of the jacket body, the inclination angle of the rotation center axis of the rotation tool with respect to the outer peripheral side surface of the sealing body is γ, and the stirring is performed. A method for manufacturing a liquid-cooled jacket, characterized in that friction-stirring joining is performed with γ = α, where α is the inclination angle of the outer peripheral surface of the pin with respect to the rotation center axis. A method for manufacturing a liquid-cooled jacket in which 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 are joined by using a rotating tool equipped with a stirring pin. There,
The jacket body is formed of a first aluminum alloy, the sealant is formed of a second aluminum alloy, and the first aluminum alloy is a grade having a higher hardness than the second aluminum alloy.
The stirring pin has an outer peripheral surface that is inclined so as to be tapered, and has a flat tip surface.
A preparatory step of forming a stepped portion having a stepped bottom surface and a stepped side surface rising from the stepped bottom surface toward the opening on the inner peripheral edge of the peripheral wall portion.
The sealing body is placed on the jacket body, and the side surface of the step and the outer peripheral side surface of the sealing body are abutted to form a first butt portion, and the bottom surface of the step and the back surface of the sealing body are overlapped with each other. The mounting process to form the second butt section together,
Only the stirring pin of the rotating tool is brought into contact with the jacket body, the tip of the stirring pin of the rotating rotating tool is inserted deeper than the height position of the bottom surface of the step, and the outer circumference of the stirring pin is inserted. Includes a main joining step of performing friction stir welding by rotating the rotating tool around the first abutting portion with the surface slightly in contact with the outer peripheral side surface of the sealing body.
In the main joining step, the rotation center axis of the rotation tool is inclined toward the peripheral wall portion of the jacket body, the inclination angle of the rotation center axis of the rotation tool with respect to the outer peripheral side surface of the sealing body is γ, and the stirring is performed. A method for manufacturing a liquid-cooled jacket, characterized in that friction-stirring joining is performed with γ = α, where the inclination angle α of the outer peripheral surface of the pin with respect to the rotation center axis is set. In the preparatory step, a convex portion along the step side surface is formed on the end surface of the peripheral wall portion.
The method for manufacturing a liquid-cooled jacket according to any one of claims 1 to 4, wherein in the main joining step, frictional stirring is performed in a state where the stirring pin and the convex portion are in contact with each other. The method for manufacturing a liquid-cooled jacket according to any one of claims 1 to 5, wherein the plate thickness of the sealing body is made larger than the height dimension of the step side surface. Claims 1 to 6 are characterized in that a spiral groove is provided on the outer peripheral surface of the stirring pin, and the length dimension of the region where the spiral groove is formed is made larger than the height dimension of the step side surface. The method for manufacturing a liquid-cooled jacket according to any one of the above. The production of the liquid-cooled jacket according to any one of claims 1 to 7, wherein the first aluminum alloy is formed of a cast material and the second aluminum alloy is formed of a wrought material. Method. When a left-handed spiral groove is engraved on the outer peripheral surface of the rotating tool from the proximal end side toward the distal end side, the rotating tool is rotated clockwise to rotate it clockwise.
One of claims 1 to 8, wherein when a clockwise spiral groove is engraved on the outer peripheral surface of the rotating tool from the proximal end side toward the distal end side, the rotating tool is rotated counterclockwise. The method for manufacturing a liquid-cooled jacket according to the item. In the main joining step, the rotation direction and the traveling direction of the rotation tool so that the jacket body side is the flow side and the sealing body side is the shear side in the plasticized region formed in the movement locus of the rotation tool. The method for manufacturing a liquid-cooled jacket according to any one of claims 1 to 9, wherein the liquid-cooled jacket is set. In the preparatory step, a step portion having a step bottom surface and a step side surface that rises diagonally from the step bottom surface toward the opening is formed on the inner peripheral edge of the peripheral wall portion.
The liquid cooling according to any one of claims 1 to 10, wherein in the main joining step, a gap between the step side surface and the outer peripheral side surface of the sealing body is filled with a plastic fluid material. How to make a jacket.

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