JP2021112756A - Manufacturing method of liquid-cooled jacket - Google Patents

Abstract

To provide a manufacturing method of a liquid-cooled jacket capable of appropriately joining aluminum alloys of different materials.SOLUTION: A manufacturing method of a liquid-cooled jacket includes a regular joining process for bringing only an agitation pin F2 of a rotary tool F into contact with a jacket body 2, and performing friction agitation joining to a first abutting part J1 in the state of being brought into slight contact even with a side surface 31c of a sealing body 3. In the regular joining process, when the inclined angle of the side surface 31c with respect to the normal direction of the rear surface 3b of the sealing body 3 is denoted by θ, and the inclined angle with respect to the rotation center axis C of the outer circumferential surface of the agitation pin F2 is denoted by α, friction agitation joining is performed in the state of θ=α, and also, the agitation pin F2 is inserted from a start position SP1, and gradually pushed in until reaching a predetermined depth while being moved in the advancing direction thereof.SELECTED DRAWING: Figure 4

Description

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

For example, Patent Document 1 discloses a method for manufacturing a liquid-cooled jacket. FIG. 12 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 F52 of the rotating tool F50 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. 12, the stirring pin F52 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 F50, and there is a problem that cavity defects occur in the plasticized region after joining and the joining strength decreases.

Further, when the stirring pin F2 is inserted into the butt portion J10, the stirring pin F52 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, which causes a problem of contributing to poor joining.

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

From this point of view, the present invention uses a rotating tool provided with a stirring pin to form a bottom, a jacket body having a peripheral wall portion rising from the peripheral edge of the bottom, and a sealing body for sealing the opening of the jacket body. A method for manufacturing a liquid-cooled jacket to be joined, wherein the jacket body is formed of a first aluminum alloy, and the sealing body is a clad formed of a second aluminum alloy on the lower side and copper or a copper alloy on the upper side. The first aluminum alloy is a material 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. A stepped portion having a stepped bottom surface and a stepped side surface rising from the stepped bottom surface toward the opening is formed on the inner peripheral edge of the sealing body, and the plan view area of the sealed body is increased from the lower side to the upper side. A preparatory step in which at least the lower side surface of the second aluminum alloy is inclined so as to be reduced, and the sealing body is placed on the jacket body, and the stepped side surface and the side surface of the sealing body are abutted against each other. A mounting step of forming a first butt portion having a character gap and superimposing the bottom surface of the step and the back surface of the sealing body to form a second butt portion, and the stirring pin of the rotating tool that rotates. In a state where only the alloy is in contact with the jacket body and slightly in contact with the side surface of the sealing body, the rotating tool is rotated around the end face of the peripheral wall portion along a preset movement route to stir the friction. In the main joining step, the inclination angle of the side surface of the sealing body with respect to the normal direction of the back surface of the sealing body is set to θ, and the rotation center of the outer peripheral surface of the stirring pin is set to θ. Assuming that the inclination angle with respect to the axis is α, frictional stirring joining is performed with θ = α, and only the rotating stirring pin is inserted at a start position set further outside the set movement route, and then the rotation is performed. It is characterized in that the stirring pin is gradually pushed in until the tool reaches a predetermined depth while moving the tool to the set movement route.

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. A method for manufacturing a cold jacket, the jacket body is made of a first aluminum alloy, and the sealant is a clad material formed of a second aluminum alloy on the lower side and copper or a copper alloy on the upper side. The first aluminum alloy is a grade having a higher hardness than the second aluminum alloy, and the outer peripheral surface of the stirring pin is inclined so as to be tapered. A stepped portion having a stepped bottom surface and a stepped side surface rising from the stepped bottom surface toward the opening is formed, and the plan view area of the sealed body is reduced from the lower side to the upper side. In the preparatory step of providing at least an inclination on the lower side surface of the second aluminum alloy, the encapsulant is placed on the jacket body, and the step side surface and the side surface of the encapsulant body are abutted against each other to form a V-shaped gap. Only the mounting step of forming the first butt portion having the above stepped surface and the back surface of the sealing body to form the second butt portion and the stirring pin of the rotating tool are described. While in contact with the jacket body and slightly in contact with the side surface of the sealing body, the rotating tool is rotated around the end surface of the peripheral wall portion along a preset movement route to perform frictional stirring joining. Including the main joining step, in the main joining step, the inclination angle of the side surface of the sealing body with respect to the normal direction of the back surface of the sealing body is set to θ, and the inclination of the outer peripheral surface of the stirring pin with respect to the rotation center axis. Assuming that the angle is α, frictional stirring and joining is performed with θ = α, and the stirring pin is inserted from the start position set on the set movement route until the depth reaches a predetermined depth while moving in the traveling direction. The stirring pin is gradually pushed in.

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 first butt portion is formed with the step side surface of the jacket body. It can be joined to the side surface of the sealant. Further, since the outer peripheral surface of the stirring pin is kept in contact with the side surface of 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, by providing the side surface of the sealing body with an inclination, the contact allowance between the side surface and the rotating tool can be reduced. Further, by gradually pushing the stirring pin until it reaches a predetermined depth while moving the rotation tool to a position overlapping the set movement route, it is possible to prevent the frictional heat from becoming excessive on the set movement route. Further, by gradually pushing the stirring pin until it reaches a predetermined depth 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. As a result, it is possible to prevent the second aluminum alloy of the sealant from being mixed into the jacket body side on the set movement route.

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. A method for manufacturing a cold jacket, the jacket body is made of a first aluminum alloy, and the sealant is a clad material formed of a second aluminum alloy on the lower side and copper or a copper alloy on the upper side. The first aluminum alloy is a grade having a higher hardness than the second aluminum alloy, and the stirring pin has an outer peripheral surface that is inclined so as to be tapered and has a flat tip surface. A stepped portion having a stepped bottom surface and a stepped side surface rising from the stepped bottom surface toward the opening is formed on the inner peripheral edge of the peripheral wall portion, and the sealing body is formed from the lower side to the upper side. A preparatory step of providing an inclination at least on the lower side surface of the second aluminum alloy so as to reduce the plan view area, and the step side surface and the side surface of the encapsulant body on which the encapsulant is placed on the jacket body. To form a first butt portion having a V-shaped gap, and to form a second butt portion by superimposing the bottom surface of the step and the back surface of the sealing body, and the rotating tool that rotates. Only the stirring pin of the above is brought into contact with the jacket body, the tip of the stirring pin of the rotating tool is inserted deeper than the height of the bottom surface of the step, and the outer peripheral surface of the stirring pin is inserted into the sealing body. The main joining step includes a main joining step of rotating the rotary tool around the end face of the peripheral wall portion along a preset movement route in a state of being slightly in contact with the side surface to perform frictional stirring joining. Assuming that the inclination angle of the side surface of the sealing body with respect to the normal direction of the back surface of the sealing body is θ and the inclination angle α of the outer peripheral surface of the stirring pin with respect to the rotation center axis is α, friction is performed with θ = α. After performing stirring joining and inserting only the rotating stirring pin into the set start position outside the set movement route, the rotation tool is moved to the set movement route and the stirring is performed until a predetermined depth is reached. It is characterized by gradually pushing in the pin.

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. A method for manufacturing a cold jacket, the jacket body is made of a first aluminum alloy, and the sealant is a clad material formed of a second aluminum alloy on the lower side and copper or a copper alloy on the upper side. The first aluminum alloy is a grade having a higher hardness than the second aluminum alloy, and the stirring pin has an outer peripheral surface that is inclined so as to be tapered and has a flat tip surface. A stepped portion having a stepped bottom surface and a stepped side surface rising from the stepped bottom surface toward the opening is formed on the inner peripheral edge of the peripheral wall portion, and the sealing body is formed from the lower side to the upper side. A preparatory step of providing an inclination at least on the lower side surface of the second aluminum alloy so as to reduce the plan view area, and the step side surface and the side surface of the encapsulant body on which the encapsulant is placed on the jacket body. To form a first butt portion having a V-shaped gap, and to form a second butt portion by superimposing the bottom surface of the step and the back surface of the sealing body, and the rotating tool that rotates. Only the stirring pin of the above is brought into contact with the jacket body, the tip of the stirring pin of the rotating tool is inserted deeper than the height of the bottom surface of the step, and the outer peripheral surface of the stirring pin is inserted into the sealing body. The main joining step includes a main joining step of rotating the rotary tool around the end face of the peripheral wall portion along a preset movement route in a state of being slightly in contact with the side surface to perform frictional stirring joining. Assuming that the inclination angle of the side surface of the sealing body with respect to the normal direction of the back surface of the sealing body is θ and the inclination angle α of the outer peripheral surface of the stirring pin with respect to the rotation center axis is α, friction is performed with θ = α. It is characterized in that the stirring pin is inserted from a set start position on the set movement route, and the stirring pin is gradually pushed in until it reaches a predetermined depth while moving in the traveling direction.

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 first butt portion is formed with the step side surface of the jacket body. It can be joined to the side surface of the sealant. Further, since the outer peripheral surface of the stirring pin is kept in contact with the side surface of 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, by providing the side surface of the sealing body with an inclination, the contact allowance between the side surface and the rotating tool can be reduced. Further, by gradually pushing the stirring pin until it reaches a predetermined depth while moving the rotation tool to a position overlapping the set movement route, it is possible to prevent the frictional heat from becoming excessive on the set movement route. Further, by gradually pushing the stirring pin until it reaches a predetermined depth 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. As a result, it is possible to prevent the second aluminum alloy of the sealant from being mixed into the jacket body side on the set movement route. Further, the joining strength can be increased by inserting the tip of the stirring pin of the rotating tool deeper than the height of the bottom surface of the step.

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 arranged in the liquid-cooled jacket 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, friction stir welding can be efficiently performed over the entire height direction of the side surface of the step.

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.

According to such a manufacturing method, the strength of the jacket body can be increased and the thermal conductivity of the sealed body can be increased.

Further, when a left-handed spiral groove is engraved on the outer peripheral surface of the rotation tool from the proximal end side toward the distal end side, the rotary tool is rotated clockwise and the peripheral surface of the rotary tool is from the proximal end side to the distal end side. When a clockwise spiral groove is carved toward, it is preferable to rotate the rotation tool counterclockwise.

According to such a manufacturing method, since the plastic fluid material can be guided to the tip end side of the stirring pin, the generation of burrs can be suppressed.

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, friction stir welding of the first butt portion is promoted, and more suitable joining can be performed.

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 side surface of the sealing body with a plastic fluid material.

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

It is 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 side view which shows the rotation tool which concerns on 1st Embodiment. It is a perspective view which shows the main joining process of the manufacturing method of the liquid-cooled jacket which concerns on 1st Embodiment. It is sectional drawing which looked at the closet section in this joining process which concerns on 1st Embodiment from the side. FIG. 5 is a cross-sectional view of the vicinity of the intermediate point S1 in the main joining step according to the first embodiment as viewed from the rear in the traveling direction. It is sectional drawing which looked at the detachment section in this joining process which concerns on 1st Embodiment from the side. It is a perspective view which shows after the completion in this joining process which concerns on 1st Embodiment. FIG. 5 is a cross-sectional view of the vicinity of the intermediate point S1 in the main joining step according to the second embodiment as viewed from the rear in the traveling direction. It is a perspective view which shows the main joining process of the manufacturing method of the liquid-cooled jacket which concerns on 3rd Embodiment. It is a perspective view which shows after the completion in this joining process which concerns on 3rd Embodiment. It is sectional drawing which shows the manufacturing method of the conventional liquid-cooled jacket.

[First Embodiment]
The method for manufacturing a liquid-cooled jacket according to the first embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the method for manufacturing a liquid-cooled jacket according to the present embodiment is to manufacture a 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. The "front surface" in the following description 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. Hereinafter, each step will be described in order.

(Preparation process)
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 an aluminum alloy. As the 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 convex portion 20 may be omitted.

The sealing body 3 is a plate-shaped member that seals the opening of the jacket body 2. The sealing body 3 is a clad material, and the lower first base portion 31 is formed of a second aluminum alloy and the upper second base portion 32 is formed of copper or a copper 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. In the present specification, the hardness refers to Brinell hardness, which can be measured by a method according to JIS Z 2243.

The first base portion 31 on at least the lower side of the sealing body 3 is provided with an inclination on the side surface 31c so that the plane viewing area decreases from the lower side to the upper side. Hereinafter, the inclination angle of the side surface 31c of the first base portion 31 on the lower side of the sealing body 3 with respect to the normal direction of the back surface 3b of the sealing body 3 is defined as θ. In the present embodiment, after the first base portion 31 and the second base portion 32 are rolled and joined to form the sealing body 3, the side surface 3c of the sealing body 3 (the side surface 31c of the first base portion 31 and the second base). The entire side surface 32c) of the portion 32 is provided with an inclination.

The back surface 3b of the sealing body 3 has a size that covers the step bottom surface 12a with almost no gap when it is placed on the step bottom surface 12a of the jacket body 2 in the subsequent mounting step. 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.

(Placement process)
As shown in FIG. 2, the mounting step is a step of mounting the sealing body 3 on the jacket body 2. 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 side surface 3c of the sealing body 3 are abutted to form the first abutting portion J1. Since the side surface 31c of the first base portion 31 on the lower side of the sealing body 3 is provided with an inclination, a gap having a V-shaped cross section is formed between the side surface 31c and the stepped side surface 12b. Further, the bottom surface 12a of the step and the back surface 3b of the sealing body 3 are abutted to form the second abutting portion J2. In the present embodiment, when the sealing body 3 is placed, the boundary between the lower first base portion 31 and the upper second base portion 32 of the sealing body 3 is higher than the end surface 11a of the peripheral wall portion 11. Become.

(Main joining process)
As shown in FIGS. 3 to 8, this joining step is a step of friction-stir welding the jacket body 2 and the sealing body 3 using the rotary tool F.

(Rotation tool)
As shown in FIG. 3, the rotation tool F includes a base shaft portion F1 and a stirring pin F2. The rotary tool F is made of, for example, tool steel. The base shaft portion F1 is a portion connected to a rotating shaft of a friction stir device (not shown). The base shaft portion F1 has a columnar shape.

The stirring pin F2 hangs down from the base shaft portion F1 and is coaxial with the base shaft portion F1. The stirring pin F2 is tapered as it is separated from the base shaft portion F1. A flat flat surface F3 is formed at the tip of the stirring pin F2. The flat surface F3 is perpendicular to the rotation center axis C. As described above, the outer surface of the stirring pin F2 is composed of a tapered outer peripheral surface and a flat 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, the length dimension of the region where the spiral groove is formed is set to be larger than the height dimension of the step side surface 11b of the peripheral wall portion 11.

In the present embodiment, in order to rotate the 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 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.

(Move the rotation tool)
First, the "set movement route L1", which is the route through which the center of the flat surface F3 of the rotation tool F passes, is set. As shown in FIG. 4, the set movement route L1 is indicated by a alternate long and short dash line. The set movement route L1 is set on the convex portion 20 in the present embodiment. The set movement route L1 will be described later.

As shown in FIG. 4, in the main joining step, the intrusion section from the start position SP1 to the intermediate point S1, the main section from the intermediate point S1 to the intermediate point S2, and the intermediate point S2 to the end position EP1. The three sections of the detachment section are continuously subjected to friction stir welding. The intermediate points S1 and S2 are set on the set movement route L1. The start position SP1 is set on the end surface 11a of the peripheral wall portion 11 and outside the set movement route L1. In the present embodiment, the start position SP1 is set at a position where 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.

In the closet section of the main joining step, as shown in FIG. 5, 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 while the rotation center axis C is perpendicular to the end surface 11a of the peripheral wall portion 11, and is moved to the intermediate point S1. At this time, as shown in FIG. 5, the stirring pin F2 is gradually pushed in so as to reach a preset "predetermined depth" by at least reaching the intermediate point S1. That is, 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.

When the midpoint S1 is reached, the stirring pin F2 has reached a predetermined depth. The “predetermined depth” means the depth at which the stirring pin F2 is inserted in this section from the intermediate point S1 to the intermediate point S2 on the set movement route L1. In the present embodiment, as shown in FIG. 6, the predetermined depth is set so that the peripheral wall portion 11 of the jacket body 2 and the base shaft portion F1 of the rotation tool F are separated from each other, and only the stirring pin F2 is inserted into the peripheral wall portion 11. The outer peripheral surface of the stirring pin F2 and the side surface 31c of the first base portion 31 on the lower side of the sealing body 3 are set so as to be in a slightly contacted state. Further, in the present embodiment, a predetermined depth is set so that the flat surface F3 of the rotation tool F is at a position higher than the step bottom surface 12a.

The rotary tool F that has reached the intermediate point S1 shifts to the friction stir welding in this section while maintaining a predetermined depth. The contact allowance (offset amount) N between the outer peripheral surface of the stirring pin F2 and the side surface 31c of the first substrate portion 31 is set, for example, between 0 <N ≦ 1.0 mm, preferably 0 <N ≦ 0.85 mm. It is set between 0 <N ≦ 0.65 mm, more preferably 0 <N ≦ 0.65 mm.

The set movement route L1 includes the side surface 31c of the first base portion 31 on the lower side of the sealing body 3 and the outer peripheral surface of the stirring pin F2 when the stirring pin F2 is pushed in in the circumferential direction of the first butt portion J1. Are set as appropriate so that they are slightly in contact with each other while keeping them parallel to each other. In the present embodiment, the set movement route L1 is set on the surface (upper surface) of the convex portion 20.

In this joining step, friction stir welding is performed while a plastic fluid material is allowed to flow into a gap having a V-shaped cross section between the stepped side surface 11b of the peripheral wall portion 11 and the side surface 31c of the first base portion 31 on the lower side of the sealing body 3. I do. At this time, at least the outer peripheral surface of the stirring pin F2 and the first base portion 31 of the sealing body 3 are brought into contact with each other, so that the second aluminum alloy of the first base portion 31 is slightly scraped off, and the second aluminum alloy is used as the jacket body 2. It mixes on the side.

The rotation tool F is made to go around along the set movement route L1, and after the stirring pin F2 reaches the intermediate point S2, the rotation tool F shifts to the departure section as it is. In the detachment section, as shown in FIG. 7, the stirring pin F2 is gradually pulled out from the intermediate point S2 toward the end position EP1, and the stirring pin F2 is detached from the jacket body 2 at the end position EP1. That is, as shown in FIG. 8, the rotation tool F is gradually pulled out while being moved to the end position EP1 without staying at one place.

In the present embodiment, the end position EP1 is set on the end surface 11a of the peripheral wall portion 11 outside the set movement route L1. Further, in the present embodiment, the end position EP1 is set at a position where the angle formed by the line segment connecting the end position EP1 and the intermediate point S2 and the set movement route L1 is an obtuse angle. A plasticized region W1 is formed in the movement locus of the rotation tool F.

According to the method for manufacturing a liquid-cooled jacket according to the present embodiment described above, the first aluminum alloy mainly on the jacket body 2 side of the first butt portion J1 is agitated by the frictional heat between the jacket body 2 and the stirring pin F2. It is plastically fluidized, and the stepped side surface 12b of the jacket body 2 and the side surface 3c of the sealing body 3 (the side surface 31c of the first base portion 31) 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 side surface 3c of the sealing body 3, it is possible to minimize the mixing of the second aluminum alloy from the sealing body 3 into 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, in the present embodiment, since the second base portion 32 made of copper or copper alloy in the sealing body 3 and the rotating tool F are not brought into contact with each other, copper or copper alloy may be mixed into the jacket body 2 side. do not have. Further, by providing the side surface 3c of the sealing body 3 with an inclination, the contact allowance between the side surface 3c and the rotation tool F can be reduced.

Further, in this joining step, the inclination angle of the side surface 3c of the sealing body 3 with respect to the normal direction of the back surface 3b of the sealing body 3 is θ, and the inclination angle of the outer peripheral surface of the stirring pin F2 with respect to the rotation center axis C is α. Then, friction stir welding is performed with θ = α. In other words, since the friction stir welding can be performed in a state where the outer peripheral surface of the stirring pin F2 and the side surface 3c of the sealing body 3 (the side surface 31c of the first base portion 31) are parallel to each other, the friction stir welding can be performed over the height direction. It is possible to perform friction stir welding in a well-balanced manner.

Further, in the present embodiment, since only the stirring pin F2 is brought into contact with the jacket body 2, the load acting on the friction stir device can be reduced as compared with the case where the shoulder portion is brought into contact with the jacket body 2.

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

Further, by gradually pushing the stirring pin F2 until it reaches a predetermined depth while moving the rotation tool F to a position overlapping the set movement route L1, it is possible to prevent the frictional heat from becoming excessive on the set movement route L1. be able to. Further, by gradually pulling out the stirring pin F2 while moving the rotating tool F, it is possible to prevent the frictional heat from becoming excessive on the set movement route L1. As a result, it is possible to prevent the second aluminum alloy of the sealing body 3 from being mixed into the jacket body 2 side on the set movement route L1.

Further, since the sealing body 3 is a clad material in which the lower first base portion 31 is made of a second aluminum alloy and the upper second base portion 32 is made of copper or a copper alloy, the copper or copper alloy is high. The liquid-cooled jacket 1 having both thermal conductivity and light weight of an aluminum alloy can be obtained. Further, since the jacket body 2 is made of cast aluminum alloy, the strength of the liquid-cooled jacket 1 can be increased.

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 this joining step, the rotation direction and the traveling direction of the rotation tool F may be appropriately set, but of the plasticized region W formed in the movement locus of the rotation tool F, the sealing body 3 side becomes the shear side. The rotation direction and the traveling direction of the rotation tool F were set so that the jacket body 2 side was 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. Can be joined more reliably.

The shear side is the side where the relative speed of the outer circumference of the rotating tool F 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 F. means. On the other hand, the flow side (Retreating side) refers to a side in which the relative speed of the rotating tool F with respect to the jointed portion becomes low due to the rotation of the rotating tool F in the direction opposite to the moving direction of the rotating tool F.

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, since a spiral groove is provided on the outer peripheral surface of the stirring pin F2 and the length dimension of the region where the spiral groove is formed is larger than the height dimension of the step side surface 12b, the first butt portion J1 Friction stir welding can be performed efficiently over the entire height direction.

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 in this section is V2, V1> V2 may be satisfied. The rotation speed V2 is a preset constant rotation speed in the set movement route L1. That is, at the start position SP1, the rotation speed may be set high, and the rotation speed may be gradually reduced in the closet section to shift to the main section.

Further, in the detachment section of the first main joining step, if the rotation speed of the rotation tool F in this section is V2 and the rotation speed of the rotation tool F when detached at the end position EP1 is V3, V3> V2 may be satisfied. That is, after shifting to the detachment section, the rotation tool F may be detached from the peripheral wall portion 11 while gradually increasing the rotation speed toward the end position EP1. By setting as described above when the rotary tool F is pushed into or detached from the peripheral wall portion 11, the small pressing force in the indentation section or the detachment section can be supplemented by the rotation speed, so that friction stir welding can be performed. It can be preferably performed.

[Second Embodiment]
Next, a method for manufacturing a liquid-cooled jacket according to the second embodiment of the present invention will be described. In the production of the liquid-cooled jacket according to the present embodiment, a preparation step, a mounting step, and a main joining step are performed. The preparation step and the placement step are the same as those in the first embodiment.

In the present embodiment, as shown in FIG. 9, the “predetermined depth” of the rotation tool F in the main section of the main joining step is deeper than that in the first embodiment. In this embodiment, the parts different from the first embodiment will be mainly described.

In this section of the main joining step according to the present embodiment, as shown in FIG. 9, a predetermined depth is set so that the flat surface F3 of the stirring pin F2 is deeper than the height of the step bottom surface 12a.

According to the method for manufacturing a liquid-cooled jacket according to the present embodiment described above, it is possible to obtain substantially the same effect as that of the first embodiment. Further, according to the present embodiment, since friction stir welding can be reliably performed around the second butt portion J2, the joint strength can be increased.

[Third Embodiment]
Next, a method for manufacturing a liquid-cooled jacket according to the third embodiment of the present invention will be described. As shown in FIG. 10, the present embodiment is different from the first embodiment in that the positions of the start position SP1 and the end position EP1 in the main joining process are both set on the set movement route L1. In this embodiment, the parts different from the first embodiment will be mainly described.

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

In this joining step, as shown in FIG. 10, the start position SP2 is set on the set movement route L1. In this joining step, 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, and a detachment section from the intermediate point S2 to the end position EP2. Continuously rub and stir.

In the closet section, friction stir welding is performed from the start position SP2 to the intermediate point S1. In the closet section, the stirring pin F2 rotated clockwise is inserted into the start position SP2 while the rotation center axis C is perpendicular to the end surface 11a of the peripheral wall portion 11, and is moved to the intermediate point S1. At this time, the stirring pin F2 is gradually pushed in so as to reach a preset "predetermined depth" by at least reaching the intermediate point S1 (see FIG. 5).

In the closet section, the contact allowance N between the outer peripheral surface of the stirring pin F2 and the side surface 31c of the first base portion 31 on the lower side of the sealing body 3 when the intermediate point S1 is reached, and the predetermined depth are the first implementation. Similar to form.

As shown in FIG. 11, when the stirring pin F2 reaches the intermediate point S2 by rotating the rotating tool F around the rotation tool F, the rotation tool F shifts to the detachment section as it is. In the detachment section, the stirring pin F2 is gradually pulled out from the intermediate point S2 toward the ending position EP2, and the stirring pin F2 is detached from the jacket body 2 at the ending position EP2 set on the set movement route L1.

The method for manufacturing the liquid-cooled jacket according to the present embodiment described above can also achieve substantially the same effect as that of the first embodiment. In the closet section of the main joining step according to the third embodiment, the rotation tool F is moved on the set movement route L1 and the stirring pin F2 is gradually pushed in until the depth reaches a predetermined depth, thereby 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 third embodiment, the rotation tool F is moved on the set movement route L1 and the stirring pin F2 is gradually pulled out to rotate at one point on the set movement route L1. It is possible to prevent the tool F from stopping and the frictional heat from becoming excessive. As a result, it is possible to prevent the second aluminum alloy of the sealing body 3 from being mixed into the jacket body 2 side in the set movement route L1.

In this section of the main joining step in the third embodiment, a predetermined depth may be set so that the flat surface F3 of the stirring pin F2 does not reach the step bottom surface 12a as in the first embodiment. , The flat surface F3 of the stirring pin F2 may be set to be located below the step bottom surface 12a as in the second embodiment. By locating the flat surface F3 of the stirring pin F2 below the step bottom surface 12a, the bonding strength can be further increased.

Although the embodiment of the present invention has been described above, the design can be changed as appropriate. For example, in each of the above-described embodiments, the step side surface 12b may be inclined so as to spread outward toward the opening. In this case, in this joining step, friction stir welding is performed while filling the gap between the inclined step side surface 12b and the side surface 3c of the sealing body 3 with a plastic fluid material.

1 Liquid-cooled jacket 11 Peripheral wall part 12 Step part 2 Jacket body 3 Sealing body 3b Back side (sealing body)
31 First substrate (sealing body)
32 Second base part (sealing body)
F Rotation tool F1 Base shaft part F2 Stirring pin F3 Flat surface J1 First butt part J2 Second butt part W Plasticization area L1 Setting movement route SP1, SP2 Start position EP1, EP2 End position

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 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, and the sealing body is a clad material formed of a second aluminum alloy on the lower side and copper or a copper alloy on the upper side, and the first aluminum alloy is the first aluminum alloy. It is a grade with higher hardness than dialuminum alloy,
The outer peripheral surface of the stirring pin is inclined so as to be tapered.
Regarding the jacket body, 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, and the sealing body is formed from the lower side. A preparatory step of inclining at least the lower side surface of the second aluminum alloy so that the plane view area decreases toward the upper side.
The sealing body is placed on the jacket body, and the side surface of the step and the side surface of the sealing body are abutted to form a first butt portion having a V-shaped gap, and the bottom surface of the step and the sealing body are formed. The mounting process of forming the second butt portion by superimposing the back surface of the
Along a preset movement route on the end face of the peripheral wall portion, with only the stirring pin of the rotating tool in contact with the jacket body and slightly in contact with the side surface of the sealing body. Including the main joining step of rotating the rotary tool around and performing friction stir welding.
In the main joining step, if the inclination angle of the side surface of the sealing body with respect to the normal direction of the back surface of the sealing body is θ and the inclination angle of the outer peripheral surface of the stirring pin with respect to the rotation center axis is α, θ = While performing friction stirring joint in the state of α, after inserting only the rotating stirring pin into the set start position further outside the set movement route, the rotation tool is moved to the set movement route and determined. A method for manufacturing a liquid-cooled jacket, characterized in that the stirring pin is gradually pushed in until the depth of the liquid-cooled jacket is reached. 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, and the sealing body is a clad material formed of a second aluminum alloy on the lower side and copper or a copper alloy on the upper side, and the first aluminum alloy is the first aluminum alloy. It is a grade with higher hardness than dialuminum alloy,
The outer peripheral surface of the stirring pin is inclined so as to be tapered.
Regarding the jacket body, 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, and the sealing body is formed from the lower side. A preparatory step of inclining at least the lower side surface of the second aluminum alloy so that the plane view area decreases toward the upper side.
The sealing body is placed on the jacket body, and the side surface of the step and the side surface of the sealing body are abutted to form a first butt portion having a V-shaped gap, and the bottom surface of the step and the sealing body are formed. The mounting process of forming the second butt portion by superimposing the back surface of the
Along a preset movement route on the end face of the peripheral wall portion, with only the stirring pin of the rotating tool in contact with the jacket body and slightly in contact with the side surface of the sealing body. Including the main joining step of rotating the rotary tool around and performing friction stir welding.
In the main joining step, if the inclination angle of the side surface of the sealing body with respect to the normal direction of the back surface of the sealing body is θ and the inclination angle of the outer peripheral surface of the stirring pin with respect to the rotation center axis is α, θ = While performing friction stirring joint in the state of α, the stirring pin is inserted from the start position set on the set movement route, and the stirring pin is gradually pushed in until it reaches a predetermined depth while moving in the traveling direction. A method for manufacturing a liquid-cooled jacket. 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, and the sealing body is a clad material formed of a second aluminum alloy on the lower side and copper or a copper alloy on the upper side, and the first aluminum alloy is the first aluminum alloy. It is a grade with higher hardness than dialuminum alloy,
The stirring pin has an outer peripheral surface that is inclined so as to be tapered, and has a flat tip surface.
Regarding the jacket body, 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, and the sealing body is formed from the lower side. A preparatory step of inclining at least the lower side surface of the second aluminum alloy so that the plane view area decreases toward the upper side.
The sealing body is placed on the jacket body, and the side surface of the step and the side surface of the sealing body are abutted to form a first butt portion having a V-shaped gap, and the bottom surface of the step and the sealing body are formed. The mounting process of forming the second butt portion by superimposing the back surface of the
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 of the bottom surface of the step, and the outer peripheral surface of the stirring pin is inserted. It includes a main joining step of performing friction stir welding by rotating the rotating tool around the end face of the peripheral wall portion along a preset movement route in a state of being slightly in contact with the side surface of the sealing body.
In the main joining step, if the inclination angle of the side surface of the sealing body with respect to the normal direction of the back surface of the sealing body is θ, and the inclination angle α of the outer peripheral surface of the stirring pin with respect to the rotation center axis, θ = α. In addition to performing friction stirring joint in this state, after inserting only the rotating stirring pin into the set start position outside the set movement route, the rotation tool is moved to the set movement route to a predetermined depth. A method for manufacturing a liquid-cooled jacket, which comprises gradually pushing in the stirring pin until the stirring pin becomes full. 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, and the sealing body is a clad material formed of a second aluminum alloy on the lower side and copper or a copper alloy on the upper side, and the first aluminum alloy is the first aluminum alloy. It is a grade with higher hardness than dialuminum alloy,
The stirring pin has an outer peripheral surface that is inclined so as to be tapered, and has a flat tip surface.
Regarding the jacket body, 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, and the sealing body is formed from the lower side. A preparatory step of inclining at least the lower side surface of the second aluminum alloy so that the plane view area decreases toward the upper side.
The sealing body is placed on the jacket body, and the side surface of the step and the side surface of the sealing body are abutted to form a first butt portion having a V-shaped gap, and the bottom surface of the step and the sealing body are formed. The mounting process of forming the second butt portion by superimposing the back surface of the
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 of the bottom surface of the step, and the outer peripheral surface of the stirring pin is inserted. It includes a main joining step of performing friction stir welding by rotating the rotating tool around the end face of the peripheral wall portion along a preset movement route in a state of being slightly in contact with the side surface of the sealing body.
In the main joining step, if the inclination angle of the side surface of the sealing body with respect to the normal direction of the back surface of the sealing body is θ, and the inclination angle α of the outer peripheral surface of the stirring pin with respect to the rotation center axis, θ = α. The stirring pin is inserted from the start position set on the set movement route, and the stirring pin is gradually pushed in until it reaches a predetermined depth while moving in the traveling direction. A method for manufacturing a liquid-cooled jacket. 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.
Any 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-cooled jacket according to any one of claims 1 to 10, wherein in the main joining step, a gap between the step side surface and the side surface of the sealing body is filled with a plastic fluid material. Manufacturing method.

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