JP2020175395A - Manufacturing method for liquid-cooled jacket - Google Patents

Abstract

To provide a manufacturing method for a liquid-cooled jacket that can suitably join aluminum alloy made of different kinds of materials to each other.SOLUTION: The manufacturing method for a liquid-cooled jacket includes a joining step in which a tip-side pin F3 of a rotary tool F that rotates is inserted into a sealed body 3, and an outer peripheral surface of a base end-side pin F2 is circled around the sealed body 3, at a predetermined depth, along a set movement route L1 set inside an outer peripheral side surface 3c, with the outer peripheral surface contacted with a surface 3a of the sealed body 3, while slightly contacting the outer peripheral surface of the tip-side pin F3 with a step-side surface 12b of a peripheral wall step part, so as to friction-stir a first butting part J1. In the joining step, the tip-side pin F3 rotating is inserted into a starting position set closer to inside than the set movement route L1, and then the tip-side pin F3 is gradually pushed into to have the predetermined depth while moving a rotation center shaft of the rotary tool F to a position overlapping with the set movement route L1.SELECTED DRAWING: Figure 16

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. 22 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 F42 of the rotating tool F40 is inserted into the butt portion J10 to perform friction stir welding. Further, in the conventional method for manufacturing a liquid-cooled jacket, the rotation center axis Z of the rotation tool F40 is overlapped with the butt portion J10 and relatively moved.

JP-A-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. 22, the tip side pin F3 becomes the sealing body. The material resistance received from the jacket body 101 side is larger than the material resistance received from the 102 side. Therefore, it becomes difficult to stir different grades in a well-balanced manner by the stirring pin F42 of the rotating tool F40, and there is a problem that cavity defects occur in the plasticized region after joining and the joining strength decreases.

Further, as shown in FIG. 22, when the stirring pin F42 is inserted into the butt portion J10, the stirring pin F42 is pushed in in the vertical direction until it reaches a predetermined depth, so that the frictional heat at the start position of frictional stirring becomes excessive. .. As a result, at the start position, the metal on the jacket body 101 side is likely to be mixed into the sealing body 102 side, which causes a problem of contributing to poor joining.

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 aluminum alloys of different grades.

In order to solve the above problems, the present invention is composed of a jacket body having a bottom portion and a peripheral wall portion rising from the peripheral edge of the bottom portion, and a sealing body for sealing the opening of the jacket body. It is a method of manufacturing a liquid-cooled jacket in which the sealing body is joined by frictional stirring. The jacket body is made of a first aluminum alloy, and the sealing body is made of a second aluminum alloy. The first aluminum alloy is a grade having a higher hardness than the second aluminum alloy, and the rotation tool used for friction stirring includes a base end side pin and a tip end side pin, and the taper angle of the base end side pin is It is larger than the taper angle of the tip end side pin, and a stepped step portion is formed on the outer peripheral surface of the base end side pin, and the step bottom surface and the step bottom surface are formed on the inner peripheral edge of the peripheral wall portion. A peripheral wall stepped portion having a stepped side surface rising from the opening toward the opening is formed, and the plate thickness of the sealing body is formed so as to be larger than the height dimension of the stepped side surface of the peripheral wall stepped portion. By placing the sealing body on the jacket body, the stepped side surface of the peripheral wall step portion and the outer peripheral side surface of the sealing body are abutted to form the first abutting portion, and the peripheral wall is formed. A mounting step of superimposing the step bottom surface of the step portion and the back surface of the sealing body to form a second butt portion, and inserting the tip side pin of the rotating tool into the sealing body to form the tip. The outer peripheral side surface of the sealing body is in a state where the outer peripheral surface of the side pin is slightly in contact with the step side surface of the peripheral wall step portion and the outer peripheral surface of the base end side pin is in contact with the surface of the sealing body. In the main joining step, the main joining step includes a main joining step of rubbing and stirring the first butt portion by rotating around the sealing body at a predetermined depth along a set movement route set inside. After inserting the rotating tip side pin into the set start position further inside the set movement route, the rotation center axis of the rotation tool is moved to a position overlapping the set movement route to the predetermined depth. It is characterized in that the tip side pin is gradually pushed in until it becomes.

Further, the present invention is composed of a jacket body having a bottom portion and a peripheral wall portion rising from the peripheral edge of the bottom portion, and a sealing body for sealing the opening of the jacket body, and the jacket body and the sealing body are formed. A method for manufacturing a liquid-cooled jacket that is joined by friction stir welding, wherein the jacket body is made of a first aluminum alloy, the sealant is made of a second aluminum alloy, and the first aluminum alloy is A grade having a higher hardness than the second aluminum alloy, the rotary tool used for friction stir welding includes a base end side pin and a tip end side pin, and the taper angle of the base end side pin is the taper of the tip end side pin. It is larger than the angle, and a stepped step portion is formed on the outer peripheral surface of the base end side pin, and the step bottom surface and the step bottom surface toward the opening are formed on the inner peripheral edge of the peripheral wall portion. A preparatory step of forming a peripheral wall stepped portion having a stepped side surface that rises up, and forming the plate thickness of the sealing body so as to be larger than the height dimension of the stepped side surface of the peripheral wall stepped portion. By placing the sealing body on the jacket body, the step side surface of the peripheral wall step portion and the outer peripheral side surface of the sealing body are abutted to form a first abutting portion, and the step bottom surface of the peripheral wall step portion is formed. A mounting step of superimposing the back surface of the sealing body to form a second butt portion, and inserting the tip side pin of the rotating tool into the sealing body to form an outer peripheral surface of the tip side pin. It is set inside the outer peripheral side surface of the sealing body in a state where the outer peripheral surface of the base end side pin is in contact with the surface of the sealing body while slightly contacting the step side surface of the peripheral wall step portion. Including the main joining step of frictionally agitating the first abutting portion by making a circle around the sealing body at a predetermined depth along the set movement route, the set movement route is included in the main joining step. The tip side pin is inserted from a set start position, and the tip side pin is gradually pushed in while moving in the traveling direction until the predetermined depth is reached.

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

Further, the present invention is composed of a jacket body having a bottom portion and a peripheral wall portion rising from the peripheral edge of the bottom portion, and a sealing body for sealing the opening of the jacket body, and the jacket body and the sealing body are formed. A method for manufacturing a liquid-cooled jacket to be joined by frictional stirring. The jacket body is made of a first aluminum alloy, the sealant is made of a second aluminum alloy, and the first aluminum alloy is The rotary tool used for friction stirring, which is a grade having a higher hardness than the second aluminum alloy, includes a base end side pin and a tip end side pin, and the taper angle of the base end side pin is the taper of the tip end side pin. It is larger than the angle, and a stepped step portion is formed on the outer peripheral surface of the base end side pin, and the step bottom surface and the step bottom surface toward the opening are formed on the inner peripheral edge of the peripheral wall portion. A preparatory step of forming a peripheral wall stepped portion having a stepped side surface that rises up, and forming the plate thickness of the sealing body so as to be larger than the height dimension of the stepped side surface of the peripheral wall stepped portion. By placing the sealing body on the jacket body, the step side surface of the peripheral wall step portion and the outer peripheral side surface of the sealing body are abutted to form the first abutting portion, and the step bottom surface of the peripheral wall step portion is formed. A mounting step of superimposing the back surface of the sealing body to form a second butt portion, and inserting the tip side pin of the rotating tool into the sealing body to form an outer peripheral surface of the tip side pin. It is set inside the outer peripheral side surface of the sealing body in a state where the outer peripheral surface of the base end side pin is in contact with the surface of the sealing body while slightly contacting the stepped side surface of the peripheral wall step portion. In the main joining step, the first butt portion includes a main joining step of circling around the sealing body at a predetermined depth along a set movement route and frictionally stirring the first butt portion. In the first joining step of setting the first region and the second region, clamping the jacket body and the sealing body related to the second region, and then rubbing and stirring the first region, and the first region. After clamping the jacket body and the sealing body, a second joining step of rubbing and stirring the second region is performed, and the tip that rotates in the first joining step and the second joining step. After inserting the side pin into the start position set further inside the set movement route, the tip of the rotation tool is moved to a position overlapping the set movement route until it reaches the predetermined depth. Gradually push the side pin It is characterized by entering.

Further, the present invention is composed of a jacket main body having a bottom portion and a peripheral wall portion rising from the peripheral edge of the bottom portion, and a sealing body for sealing the opening of the jacket main body, and the jacket main body and the sealing body. A method for manufacturing a liquid-cooled jacket that is joined by frictional stirring. The jacket body is made of a first aluminum alloy, the sealant is made of a second aluminum alloy, and the first aluminum alloy is The rotation tool used for friction stirring, which is a grade having a higher hardness than the second aluminum alloy, includes a base end side pin and a tip end side pin, and the taper angle of the base end side pin is the taper of the tip end side pin. It is larger than the angle, and a stepped step portion is formed on the outer peripheral surface of the base end side pin, and the step bottom surface and the step bottom surface toward the opening are formed on the inner peripheral edge of the peripheral wall portion. A preparatory step of forming a peripheral wall stepped portion having a stepped side surface that rises up, and forming the plate thickness of the sealing body so as to be larger than the height dimension of the stepped side surface of the peripheral wall stepped portion. By placing the sealing body on the jacket body, the step side surface of the peripheral wall step portion and the outer peripheral side surface of the sealing body are abutted to form the first abutting portion, and the step bottom surface of the peripheral wall step portion is formed. A mounting step of superimposing the back surface of the sealing body to form a second butt portion, and inserting the tip side pin of the rotating tool into the sealing body to form an outer peripheral surface of the tip side pin. It is set inside the outer peripheral side surface of the sealing body in a state where the outer peripheral surface of the base end side pin is in contact with the surface of the sealing body while slightly contacting the step side surface of the peripheral wall step portion. In the main joining step, the first butt portion includes a main joining step of circling around the sealing body at a predetermined depth along a set movement route and frictionally stirring the first butt portion. In the first joining step of setting the first region and the second region, clamping the jacket body and the sealing body related to the second region, and then rubbing and stirring the first region, and the first region. After clamping the jacket body and the sealing body, a second joining step of rubbing and stirring the second region is performed, and in the first joining step and the second joining step, the set movement route is performed. The tip side pin is inserted from the start position set above, and the tip side pin is gradually pushed in while moving in the traveling direction until the predetermined depth is reached.

According to such a manufacturing method, the second aluminum alloy mainly on the sealing body side of the first butt portion is agitated and plastically fluidized by the frictional heat between the sealing body and the stirring pin, and the first butt portion is sealed with the step side surface. It can be joined to the outer peripheral side surface of the body. Further, since the outer peripheral surface of the stirring pin is kept slightly in contact with the stepped side surface of the jacket body, it is possible to minimize the mixing of the first aluminum alloy from the jacket body to the sealing body. As a result, in the first butt portion, the second aluminum alloy on the sealing body side is mainly frictionally agitated, so that a decrease in joint strength can be suppressed. Further, by gradually 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 on the set movement route. Further, by separately performing the clamping position and the friction stir welding position of the jacket body and the sealing body in this joining step, the friction stir welding operation can be efficiently performed.

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

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

Further, in the main joining step, the rotation tool is rotated at a predetermined rotation speed to perform frictional stirring, and when the tip end side pin is inserted in the main joining step, the rotation speed is higher than the predetermined rotation speed. It is preferable to insert the pin on the tip side in a rotated state and move it to the set movement route while gradually reducing the rotation speed.

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

Further, in the preparatory step, a peripheral wall 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. Is preferable.

According to such a manufacturing method, the rotating tool and the side surface of the step can be reliably joined while avoiding excessive contact.

Further, in the preparatory step, it is preferable that the jacket body is die-cast and at least the sealed body is formed so as to be convex toward the surface side.

According to such a manufacturing method, the liquid-cooled jacket can be flattened by utilizing the heat shrinkage caused by the frictional heat by making it convex in advance.

Further, it is preferable to further include a temporary joining step of temporarily joining the first butt portion prior to the main joining step.

According to such a manufacturing method, it is possible to prevent the opening of the first butt portion in the main joining step.

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 side view which shows the rotation tool which concerns on embodiment of this invention. It is an enlarged sectional view of the rotation tool. It is sectional drawing which shows the 1st modification of a rotation tool. It is sectional drawing which shows the 2nd modification of the rotation tool. It is sectional drawing which shows the 3rd modification of the rotation tool. It is an exploded perspective view which shows the liquid-cooled jacket which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the mounting process of the manufacturing method of the liquid-cooled jacket which concerns on 1st Embodiment. It is a top view which shows the 1st region and the 2nd region of the liquid-cooled jacket which concerns on 1st Embodiment. It is a top view which shows the setting movement route of the liquid cooling jacket which concerns on 1st Embodiment. It is a top view which shows the 1st main joining process of the manufacturing method of the liquid-cooled jacket which concerns on 1st Embodiment. It is sectional drawing which shows the 1st main joining process of the manufacturing method of the liquid-cooled jacket which concerns on 1st Embodiment. It is sectional drawing which shows the 1st main joining process of the manufacturing method of the liquid-cooled jacket which concerns on 1st Embodiment. It is a top view which shows the 1st main joining process of the manufacturing method of the liquid-cooled jacket which concerns on 1st Embodiment. It is sectional drawing which shows the 1st main joining process of the manufacturing method of the liquid-cooled jacket which concerns on 1st Embodiment. It is a top view which shows the 2nd joining process of the manufacturing method of the liquid-cooled jacket which concerns on 1st Embodiment. It is a top view which shows the 1st main joining process of the manufacturing method of the liquid-cooled jacket which concerns on 2nd Embodiment of this invention. It is a top view which shows the 2nd joining process of the manufacturing method of the liquid-cooled jacket which concerns on 2nd Embodiment. It is a top view which shows the main joining process of the manufacturing method of the liquid-cooled jacket which concerns on 3rd Embodiment. It is a top view which shows after the main joining process of the manufacturing method of the liquid-cooled jacket which concerns on 3rd Embodiment. It is a top view which shows the main joining process of the manufacturing method of the liquid-cooled jacket which concerns on 4th Embodiment. It is a top view which shows after 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 1st modification of this invention. It is sectional drawing which shows the 2nd modification of this invention. It is sectional drawing which shows the manufacturing method of the conventional liquid-cooled jacket.

Embodiments of the present invention will be described with reference to the drawings as appropriate. First, the rotation tool used in the joining method according to the present embodiment will be described. The rotary tool is a tool used for friction stir welding. As shown in FIG. 1, the rotary tool F is made of, for example, tool steel, and is mainly composed of a base shaft portion F1, a base end side pin F2, and a tip end side pin F3. The base shaft portion F1 has a columnar shape and is a portion connected to the main shaft of the friction stir welder.

The base end side pin F2 is continuous with the base shaft portion F1 and is tapered toward the tip end. The proximal end side pin F2 has a truncated cone shape. The taper angle A of the base end side pin F2 may be appropriately set, and is, for example, 135 to 160 °. If the taper angle A is less than 135 ° or exceeds 160 °, the joint surface roughness after friction stir welding becomes large. The taper angle A is larger than the taper angle B of the tip side pin F3 described later. As shown in FIG. 2, a stepped pin step portion F21 is formed on the outer peripheral surface of the base end side pin F2 over the entire height direction. The pin step portion F21 is formed in a clockwise or counterclockwise spiral shape. That is, the pin step portion F21 has a spiral shape when viewed in a plane and a step shape when viewed from a side surface. In the first embodiment, in order to rotate the rotation tool F clockwise, the pin step portion F21 is set counterclockwise from the base end side to the tip end side.

When the rotation tool F is rotated counterclockwise, it is preferable to set the pin step portion F21 clockwise from the base end side to the tip end side. As a result, the plastic fluid material is guided to the tip side by the pin step portion F21, so that the metal overflowing to the outside of the metal member to be joined can be reduced. The pin step portion F21 is composed of a step bottom surface F21a and a step side surface F21b. The distance X1 (horizontal distance) between the vertices F21c and F21c of the adjacent pin step portions F21 is appropriately set according to the step angle C and the height Y1 of the step side surface F21b described later.

The height Y1 of the step side surface F21b may be appropriately set, but is set to, for example, 0.1 to 0.4 mm. If the height Y1 is less than 0.1 mm, the joint surface roughness becomes large. On the other hand, when the height Y1 exceeds 0.4 mm, the joint surface roughness tends to increase, and the number of effective step portions (the number of pin step portions F21 in contact with the metal member to be joined) also decreases.

The step angle C formed by the step bottom surface F21a and the step side surface F21b may be appropriately set, but is set to, for example, 85 to 120 °. The step bottom surface F21a is parallel to the horizontal plane in this embodiment. The step bottom surface F21a may be inclined in the range of -5 ° to 15 ° with respect to the horizontal plane from the rotation center axis of the tool toward the outer peripheral direction (minus is downward with respect to the horizontal plane, plus is with respect to the horizontal plane). Above). The distance X1, the height Y1 of the step side surface F21b, the step angle C, and the angle of the step bottom surface F21a with respect to the horizontal plane are such that the plastic fluid material does not stay inside the pin step portion F21 and adhere to the outside during friction stir welding. It is appropriately set so that the joint surface roughness can be reduced by pressing the plastic fluid material with the step bottom surface F21a.

As shown in FIG. 1, the distal end side pin F3 is continuously formed on the proximal end side pin F2. The tip side pin F3 has a truncated cone shape. The tip of the tip side pin F3 is a flat surface F4 perpendicular to the rotation center axis. The taper angle B of the tip end side pin F3 is smaller than the taper angle A of the base end side pin F2. As shown in FIG. 2, a spiral groove F31 is engraved on the outer peripheral surface of the tip end side pin F3. The spiral groove F31 may be clockwise or counterclockwise, but in the first embodiment, the spiral groove F31 is carved counterclockwise from the base end side to the tip end side in order to rotate the rotation tool F clockwise.

When the rotation tool F is rotated counterclockwise, it is preferable to set the spiral groove F31 clockwise from the base end side to the tip end side. As a result, the plastic fluid material is guided to the tip side by the spiral groove F31, so that the metal overflowing to the outside of the metal member to be joined can be reduced. The spiral groove F31 is composed of a spiral bottom surface F31a and a spiral side surface F31b. The distance (horizontal distance) between the vertices F31c and F31c of the adjacent spiral grooves F31 is defined as the length X2. The height of the spiral side surface F31b is defined as the height Y2. The spiral angle D composed of the spiral bottom surface F31a and the spiral side surface F31b is formed at, for example, 45 to 90 °. The spiral groove F31 has a role of increasing frictional heat by coming into contact with the metal member to be joined and guiding the plastic fluid material to the tip side.

The design of the rotation tool F can be changed as appropriate. FIG. 3 is a side view showing a first modification of the rotation tool of the present invention. As shown in FIG. 3, in the rotation tool FA according to the first modification, the step angle C formed by the step bottom surface F21a of the pin step portion F21 and the step side surface F21b is 85 °. The step bottom surface F21a is parallel to the horizontal plane. As described above, the step bottom surface F21a is parallel to the horizontal plane, and the step angle C may be an acute angle within a range in which the plastic fluid material stays in the pin step portion F21 during friction stir welding and escapes to the outside without adhering. ..

FIG. 4 is a side view showing a second modification of the rotation tool of the present invention. As shown in FIG. 4, in the rotation tool FB according to the second modification, the step angle C of the pin step portion F21 is 115 °. The step bottom surface F21a is parallel to the horizontal plane. As described above, the step bottom surface F21a is parallel to the horizontal plane, and the step angle C may be an obtuse angle within the range of functioning as the pin step portion F21.

FIG. 5 is a side view showing a third modification of the rotation tool of the present invention. As shown in FIG. 5, in the rotation tool FC according to the third modification, the step bottom surface F21a is inclined 10 ° upward with respect to the horizontal plane from the rotation center axis of the tool toward the outer peripheral direction. The step side surface F21b is parallel to the vertical surface. In this way, the step bottom surface F21a may be formed so as to incline upward from the horizontal plane from the rotation center axis of the tool toward the outer peripheral direction within a range in which the plastic fluid material can be pressed during friction stir welding. The same effect as that of the following embodiment can be obtained by the first to third modifications of the rotation tool described above.

[First Embodiment]
Embodiments of the present invention will be described with reference to the drawings as appropriate. As shown in FIG. 6, the liquid-cooled jacket 1 according to the first embodiment is composed of a jacket body 2 and a sealing body 3. The liquid-cooled jacket 1 is a device that circulates a fluid inside to cool an arranged heating element. The jacket body 2 and the sealing body 3 are integrated by friction stir welding. In the following description, the "front surface" means the surface opposite to the "back surface".

The jacket body 2 is mainly composed of a bottom portion 10 and a peripheral wall portion 11. The jacket body 2 is not particularly limited as long as it is a metal capable of friction stir welding, but in the present embodiment, it is formed mainly containing a first aluminum alloy. As the first aluminum alloy, for example, an aluminum alloy casting material such as JISH5302 ADC12 (Al—Si—Cu system) is used.

The bottom portion 10 is a plate-shaped member having a rectangular shape. The peripheral wall portion 11 is a wall portion that rises in a rectangular frame shape from the peripheral edge portion of the bottom portion 10. A recess 13 is formed in the bottom portion 10 and the peripheral wall portion 11. A peripheral wall step portion 12 is formed on the inner peripheral edge of the peripheral wall portion 11. The peripheral wall step portion 12 is composed of a step bottom surface 12a and a step side surface 12b that rises diagonally from the step bottom surface 12a. As shown in FIG. 7, the inclination angle β of the step side surface 12b may be appropriately set, but for example, in the present embodiment, it is the same as the inclination angle α of the tip side pin F3 of the rotation tool F shown in FIG. There is.

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

The sealing body 3 is a member that seals the opening of the jacket body 2. The sealing body 3 is not particularly limited as long as it is a metal capable of friction stir welding, but in the present embodiment, it is formed mainly containing a second aluminum alloy. The second aluminum alloy is a material having a lower hardness than the first aluminum alloy. The second aluminum alloy is formed of, for example, an aluminum alloy wrought material such as JIS A1050, A1100, A6063.

Next, a method for manufacturing the liquid-cooled jacket according to the present embodiment will be described. In the method for manufacturing a liquid-cooled jacket according to the present embodiment, a preparation step, a mounting step, and a main joining step are performed.

The preparation step is a step of preparing the jacket body 2 and the sealing body 3. The jacket body 2 and the sealing body 3 are not particularly limited in terms of manufacturing method, but the jacket body 2 is molded by die casting, for example. The sealing body 3 is formed by, for example, extrusion molding.

As shown in FIG. 7, the mounting step is a step of mounting the sealing body 3 on the jacket body 2. By the mounting step, the outer peripheral side surface 3c of the sealing body 3 and the step side surface 12b of the peripheral wall step portion 12 are abutted to form the first abutting portion J1. Since the step side surface 12b is inclined outward, a gap having a V-shaped cross section is formed in the first butt portion J1. The first butt portion J1 is formed in a rectangular shape in a plan view along the periphery of the sealing body 3. Further, the step bottom surface 12a of the peripheral wall step portion 12 and the back surface 3b of the sealing body 3 are abutted to form the second abutment portion J2. The plate thickness of the sealing body 3 may be appropriately set, but in the present embodiment, it is larger than the height dimension of the step side surface 12b.

As shown in FIG. 8, the region of the first butt portion J1 on one side (upper side in FIG. 8) of the intermediate line X10 set on the sealing body 3 is defined as the first region R1. Further, the region of the first butt portion J1 on the other side (lower side in FIG. 8) of the intermediate line X10 is referred to as the second region R2. The intermediate line X10 is a line segment at an intermediate position in the longitudinal direction of the sealing body 3.

As shown in FIG. 9, when the sealing body 3 is placed on the jacket main body 2, the jacket main body 2 and the sealing body 3 related to the second region R2 (see FIG. 8) are clamped immovably by the three clamps K1. .. Further, the "set movement route L1" (dashed line) is set inside the first butt portion J1. The set movement route L1 is a movement route of the rotation tool F necessary for joining the first butt portion J1 in the main joining step described later. As will be described later, in this embodiment, since the tip side pin F3 is slightly brought into contact with the step side surface 12b, the set movement route L1 is set in a rectangular shape in a plan view inside the outer peripheral side surface 3c.

As shown in FIGS. 10A and 11, this joining step is a step of friction stir welding the first butt portion J1 using the rotary tool F. In the present embodiment, the first main joining step of joining the first region R1 (see FIG. 8) of the first butt portion J1 and the second region R2 (see FIG. 8) of the first butt portion J1 are joined. The second main joining process is performed respectively.

As shown in FIG. 10A, in the first 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 on the set movement route L1, and the intermediate point S2. The three sections of the detachment section up to the end position EP1 are continuously frictionally agitated. The intermediate points S1 and S2 are set at positions where the intermediate line X10 and the set movement route L1 intersect. The start position SP1 is set at a position inside the set movement route L1 on the surface 3a of the sealing body 3. In the present embodiment, the angle between the line segment connecting the start position SP1 and the intermediate point S1 and the set movement route L1 in the first region R1 (see FIG. 8) is set to an obtuse angle.

In the closet section of the first main joining step, as shown in FIG. 10A, friction stir welding is performed from the start position SP1 to the intermediate point S1. In the closet section, the tip side pin F3 rotated clockwise is inserted into the start position SP1 and moved to the intermediate point S1. At this time, as shown in FIG. 10B, the tip side pin F3 is gradually pushed in so as to reach a preset "predetermined depth" by at least reaching the intermediate point S1. That is, the rotation tool F is gradually lowered while being moved to the set movement route L1 without staying in one place.

When the intermediate point S1 is reached, the process proceeds to friction stir welding in this section as it is. As shown in FIGS. 10A and 11, in this section, the rotation tool F is moved so that the rotation center axis Z of the tip end side pin F3 and the set movement route L1 overlap. In this section, the "predetermined depth" of the tip side pin F3 is set so that the flat surface F4 of the tip side pin F3 slightly contacts the step bottom surface 12a. The "predetermined depth" of the tip side pin F3 may be set as appropriate, and may be set at a position where the tip side pin F3 does not reach the step bottom surface 12a, for example.

In this section of the first main joining step, as shown in FIG. 11, the set movement route L1 is set so that the outer peripheral surface of the tip side pin F3 slightly contacts the step side surface 12b. Further, in this section of the first main joining step, the insertion depth is set so that the outer peripheral surface of the base end side pin F2 of the rotation tool F comes into contact with the surface 3a of the sealing body 3. Here, the contact allowance of the outer peripheral surface of the tip side pin F3 with respect to the step side surface 12b is defined as the offset amount N. When the flat surface F4 of the tip side pin F3 is inserted deeper than the step bottom surface 12a of the peripheral wall step portion 12 and the outer peripheral surface of the tip side pin F3 is brought into contact with the step side surface 12b as in the present embodiment, it is offset. The amount N is set between 0 <N ≦ 1.0 mm, preferably between 0 <N ≦ 0.85 mm, and more preferably between 0 <N ≦ 0.65 mm.

If the outer peripheral surface of the tip side pin F3 is set so as not to come into contact with the step side surface 12b, the joint strength of the first butt portion J1 is lowered. Further, if the offset amount N between the outer peripheral surface of the tip side pin F3 and the step side surface 12b exceeds 1.0 mm, a large amount of the first aluminum alloy of the jacket body 2 is mixed into the sealing body 3 side, resulting in poor bonding. There is a risk.

As shown in FIG. 12A, when the tip side pin F3 reaches the intermediate point S2, the process shifts to the detachment section as it is. In the detachment section, as shown in FIG. 12B, the tip side pin F3 is gradually moved upward from the intermediate point S2 to the end position EP1, and the tip side pin F3 is gradually moved upward from the sealing body 3 at the end position EP1. To leave. That is, the rotation tool F is gradually pulled out (raised) while being moved to the end position EP1 without staying in one place. The end position EP1 is 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 in the first region R1 (see FIG. 8) is an obtuse angle. A plasticized region W1 is formed in the movement locus of the rotation tool F.

When the first main joining step is completed, the clamp K1 is temporarily released, and as shown in FIG. 13, the jacket body 2 and the sealing body 3 related to the first region R1 (see FIG. 8) cannot be moved by the three clamps K1. Clamp to.

The second main joining step is a step of performing friction stir welding with respect to the first butt portion J1 of the second region R2 (see FIG. 8). As shown in FIG. 13, in the second main joining step, the intrusion section from the start position SP2 to the intermediate point S2, the main section from the intermediate point S2 to the intermediate point S1 on the set movement route L1, and the intermediate point S1 to The three sections of the detachment section up to the end position EP2 are continuously frictionally agitated. The start position SP2 is set at a position inside the set movement route L1 on the surface 3a of the sealing body 3. In the present embodiment, the angle between the line segment connecting the start position SP2 and the intermediate point S2 and the set movement route L1 in the second region R2 (see FIG. 8) is set to an obtuse angle.

In the closet section of the second main joining step, as shown in FIG. 13, friction stir welding is performed from the start position SP2 to the intermediate point S2. In the closet section, the tip side pin F3 rotated clockwise is inserted into the start position SP2 and moved to the intermediate point S2. At this time, the tip side pin F3 is gradually pushed in so as to reach a preset "predetermined depth" by at least reaching the intermediate point S2.

When the intermediate point S2 is reached, the process proceeds to friction stir welding in this section as it is. As shown in FIG. 13, in this section, the rotation tool F is moved so that the rotation center axis Z of the tip side pin F3 and the set movement route L1 overlap. In this section of the second main joining process, friction stir welding is performed in the same manner as in this section of the first main joining process.

When the tip side pin F3 reaches the intermediate point S1, the process shifts to the detachment section as it is. In the detachment section, the tip side pin F3 is gradually pulled out (raised) from the sealing body 3 between the intermediate point S1 and the end position EP2, and the tip side pin F3 is gradually pulled out (raised) from the sealing body 3 at the ending position EP2. To leave. The end position EP2 is set at a position where the angle formed by the line segment connecting the end position EP2 and the intermediate point S1 and the set movement route L1 in the second region R2 (see FIG. 8) is an obtuse angle. A plasticized region W2 is formed in the movement locus of the rotation tool F.

According to the method for manufacturing a liquid-cooled jacket in the present embodiment described above, the second aluminum alloy mainly on the sealing body 3 side of the first butt portion J1 is agitated by the frictional heat between the sealing body 3 and the tip side pin F3. Then, it is plastically fluidized, and the step side surface 12b and the outer peripheral side surface 3c of the sealing body 3 can be joined at the first butt portion J1. Further, since the outer peripheral surface of the tip side pin F3 is kept slightly in contact with the stepped side surface 12b of the jacket body 2, the mixing of the first aluminum alloy from the jacket body 2 into the sealing body 3 can be minimized. As a result, in the first butt portion J1, the second aluminum alloy on the sealing body 3 side is mainly frictionally agitated, so that a decrease in joint strength can be suppressed. That is, in this joining step, the imbalance of the material resistance received by the tip side pin F3 on one side and the other side with respect to the rotation center axis Z of the tip side pin F3 can be minimized. As a result, the plastic fluid material is frictionally agitated in a well-balanced manner, so that a decrease in joint strength can be suppressed. Further, by increasing the plate thickness of the sealing body 3, it is possible to prevent a metal shortage at the joint portion.

Further, in the present embodiment, in the main joining step, the outer peripheral surface of the base end side pin F2 is brought into contact with the sealing body 3, and friction stirring is performed while pressing the plastic fluid material, so that the generation of burrs can be suppressed. it can. Further, since the plastic fluid material can be pressed on the outer peripheral surface of the base end side pin F2, the stepped concave groove formed on the joint surface (surface 3a of the sealing body 3) can be reduced, and the stepped concave groove can be reduced. The bulge formed on the side of the swelling can be eliminated or reduced. Further, since the stepped pin step portion F21 of the base end side pin F2 is shallow and the outlet is wide, the plastic fluid material can be easily pulled out to the outside of the pin step portion F21 while pressing the plastic fluid material with the step bottom surface F21a. There is. Therefore, even if the plastic fluid material is pressed by the base end side pin F2, the plastic fluid material is unlikely to adhere to the outer peripheral surface of the base end side pin F2. Therefore, the roughness of the joint surface can be reduced, and the joint quality can be suitably stabilized.

Further, in the closet section of the first main joining step and the second main joining step, the tip side pin F3 is moved to a predetermined depth while moving the rotation tool F from the start positions SP1 and SP2 to the position overlapping with the set movement route L1. By gradually pushing in, it is possible to prevent the rotation tool F from stopping on the set movement route L1 and causing the frictional heat to become excessive.
Similarly, in the detachment section of the first main joining step and the second main joining step, the tip side pin F3 is gradually raised from a predetermined depth while moving the rotation tool F from the set movement route L1 to the end positions EP1 and EP2. It is possible to prevent the rotation tool F from stopping on the set movement route L1 and causing the frictional heat to become excessive.
As a result, it is possible to prevent the frictional heat from becoming excessive on the set movement route L1 and excessively mixing the first aluminum alloy from the jacket body 2 to the sealing body 3 to cause poor bonding.

Further, by performing friction stir welding with the tip side pin F3 slightly in contact with both the step side surface 12b and the step bottom surface 12a, the first butt portion J1 and the second butt portion J2 can be reliably joined. it can. Further, in order to keep the step side surface 12b and the tip side pin F3 in slight contact and the step bottom surface 12a and the tip side pin F3 in slight contact, the first aluminum alloy from the jacket body 2 to the sealing body 3 Can be prevented as much as possible.

Further, in the main joining step, the positions of the start positions SP1 and SP2 may be appropriately set, but by setting the angle formed by the start positions SP1 and SP2 and the set movement route L1 to be obtuse, the intermediate point S1 , S2 smoothly shifts to this section without slowing down the moving speed of the rotation tool F. As a result, it is possible to prevent the frictional heat from becoming excessive due to the rotation tool F stopping or the moving speed decreasing on the set movement route L1. Further, by setting the end positions EP1 and EP2 in the same manner as the start positions SP1 and PS2, the rotation tool F can be smoothly moved from this section to the departure section.

Further, in the main joining step of the present embodiment, the rotation direction and the traveling direction of the rotation tool F may be appropriately set, but the jacket body 2 side of the plasticized region W1 formed in the movement locus of the rotation tool F is sheared. The rotation direction and the traveling direction of the rotation tool F were set so as to be on the side and the sealing body 3 side was on the flow side. By setting the jacket body 2 side to be the shear side, the stirring action by the tip side pin F3 around the first butt portion J1 is enhanced, and the temperature rise in the first butt portion J1 can be expected, and the first butt portion J1 The step side surface 12b and the outer peripheral side surface 3c of the sealing body 3 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, when the set movement route L1 of the main joining process is a closed route as in the present embodiment, the rotation tool F and the clamp K1 interfere with each other when the main joining process is performed, which complicates the work. There is a problem of becoming. However, according to the present embodiment, the friction stir welding operation can be efficiently performed by separately performing the clamp position and the friction stir welding position in the first main joining step and the second main joining step.

Further, in the main joining step, since the entire circumference of the first butt portion J1 can be friction-stir welded in the first main joining step and the second main joining step, the airtightness and watertightness of the liquid-cooled jacket can be improved. Further, for example, at the end portion of the second main joining step, the detaching step may be performed so that the rotation tool F completely passes through the intermediate point S1 and then heads toward the end position EP2. That is, the airtightness and watertightness are further enhanced by overlapping the ends of the plasticized region W1 formed by the first main joining step and the plasticized region W2 formed by the second main joining step. Can be done.

Further, by setting the inclination angle α of the tip side pin F3 and the inclination angle β of the step side surface 12b to be the same (parallel), the tip side pin F3 is uniformly contacted over the entire height direction of the step side surface 12b. Can be made to. As a result, friction stir welding can be performed in a well-balanced manner.

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 first main joining step, if the rotation speed of the rotation tool F at the start position SP1 is V1 and the rotation speed of the rotation tool F between the intermediate points S1 to S2 is V2, V1> V2 may be satisfied. The rotation speed V2 is a preset constant rotation speed in the set movement route L1. That is, at the start position SP1, the rotation speed may be set high, and the rotation speed may be gradually reduced in the closet section to shift to the main section.

Further, assuming that the rotation speed of the rotation tool F between the intermediate points S1 and S2 is V2 and the rotation speed of the rotation tool F at the end position EP1 is V3 in the detachment section of the first main joining step, V3> V2. May be. That is, after shifting to the detachment section, the rotation tool F may be detached from the sealing body 3 while gradually increasing the rotation speed toward the end position EP1. When the rotary tool F is pushed into the sealing body 3 or separated from the sealing body 3, by setting as described above, a small pressing force in the pushing section or the separating section can be compensated by the rotational speed. Therefore, friction stir welding can be preferably performed. The fact that the rotation speed of the rotation tool F may be changed in the closet section or the release section is the same in both the second joining step and other embodiments.

[Second Embodiment]
Next, a method for manufacturing a liquid-cooled jacket according to the second embodiment of the present invention will be described. In the second embodiment, as shown in FIG. 14, the positions of the start position SP1 and the end position EP1 in the main joining step are different from those of the first embodiment. The same applies to the start position SP2 and the end position EP2. In the second embodiment, the parts different from the first embodiment will be mainly described.

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

In this joining step, the first main joining step of friction stir welding with respect to the first region R1 (see FIG. 8) of the first butt portion J1 and the second with respect to the second region R2 (see FIG. 8). This joining step is performed. As shown in FIG. 14, in the first main joining step of the present embodiment, the start position SP1 is set on the second region R2 (see FIG. 8) side of the intermediate point S1 on the set movement route L1. Further, in the second joining step of the present embodiment, the end position EP1 is set on the second region R2 (see FIG. 8) side of the intermediate point S2 on the set movement route L1.

In the first 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 on the set movement route L1, and the departure section from the intermediate point S2 to the end position EP1. The three sections of are continuously rubbed and agitated. The intermediate points S1 and S2 are set at positions where the intermediate line X10 and the set movement route L1 intersect.

In the closet section of the first main joining step, as shown in FIG. 14, friction stir welding is performed from the start position SP1 to the intermediate point S1. In the closet section, the tip side pin F3 rotated clockwise is inserted into the start position SP1 and moved to the intermediate point S1. At this time, the tip side pin F3 is gradually pushed in so as to reach a preset "predetermined depth" by at least reaching the intermediate point S1.

When the intermediate point S1 is reached, the process proceeds to friction stir welding in this section as it is. As shown in FIGS. 14 and 15, in this section, the rotation tool F is moved so that the rotation center axis Z of the tip side pin F3 and the set movement route L1 overlap. The offset amount between the tip side pin F3 and the step side surface 12b and the insertion depth of the tip side pin F3 are the same as those in the first embodiment.

When the tip side pin F3 reaches the intermediate point S2, the process shifts to the detachment section as it is. In the detachment section, the tip side pin F3 is gradually pulled out (raised) from the sealing body 3 between the intermediate point S2 and the end position EP1 at the end position EP1 set on the set movement route L1. The tip side pin F3 is separated from the sealing body 3.

When the first main joining step is completed, the clamp K1 is temporarily released, and as shown in FIG. 15, the jacket body 2 and the sealing body 3 related to the first region R1 (see FIG. 8) cannot be moved by the three clamps K1. Clamp to.

The second main joining step is a step of performing friction stir welding with respect to the first butt portion J1 of the second region R2 (see FIG. 8). As shown in FIG. 15, in the second main joining step, the intrusion section from the start position SP2 to the intermediate point S2, the main section from the intermediate point S2 to the intermediate point S1 on the set movement route L1, and the intermediate point S1 to Friction stir welding is continuously performed in three sections of the detachment section up to the end position EP2.

As shown in FIG. 15, in the second main joining step of the present embodiment, the start position SP2 is set on the set movement route L1 on the first region R1 (see FIG. 8) side of the intermediate point S2. Further, in the second joining step of the present embodiment, the end position EP2 is set on the set movement route L1 on the first region R1 side of the intermediate point S1. That is, both the start position SP2 and the end position EP2 are set on the plasticization region W1.

In the closet section of the second main joining step, as shown in FIG. 15, friction stir welding is performed from the start position SP2 to the intermediate point S2. In the closet section, the tip side pin F3 rotated clockwise is inserted into the start position SP2 and moved to the intermediate point S2. At this time, the tip side pin F3 is gradually pushed in so as to reach a preset "predetermined depth" by at least reaching the intermediate point S2.

When the intermediate point S2 is reached, the process proceeds to friction stir welding in this section as it is. As shown in FIG. 15, in this section, the rotation tool F is moved so that the rotation center axis Z of the tip side pin F3 and the set movement route L1 overlap. In this section of the second main joining process, friction stir welding is performed in the same manner as in this section of the first main joining process.

When the tip side pin F3 reaches the intermediate point S1, the process shifts to the detachment section as it is. In the detachment section, the tip side pin F3 is gradually pulled out (raised) from the sealing body 3 between the intermediate point S1 and the end position EP2, and the tip side pin F3 is gradually pulled out (raised) from the sealing body 3 at the ending position EP2. To leave.

The liquid-cooled jacket manufacturing method according to the second embodiment described above can also achieve substantially the same effect as that of the first embodiment. The start positions SP1 and SP2 and the end positions EP1 and EP2 in the main joining step may be set on the set movement route L1 as in the second embodiment.

[Third Embodiment]
Next, a method for manufacturing the liquid-cooled jacket according to the third embodiment of the present invention will be described. The third embodiment is different from the above-described embodiment in that, as shown in FIGS. 16 and 17, the main joining step is performed once instead of being divided into two times. In this embodiment, the points different from those in the first embodiment will be mainly described.

In the method for manufacturing a liquid-cooled jacket according to the present embodiment, a preparation step, a mounting step, and a main joining step are performed. The preparation step and the placement step are the same as those in the first embodiment. In this joining step, the rotating tool F rotated clockwise is inserted into the start position SP3, and friction stir welding is performed with respect to the first butt portion J1.

As shown in FIGS. 16 and 17, in the main joining step, the intrusion section from the start position SP1 to the intermediate point S1 and the reference point around the intermediate point S1 on the set movement route L1 to the sealing body 3 are circled. The main section up to S3 and the departure section from the reference point S3 to the end position EP3 are continuously friction-stir-welded. The intermediate point S1 is set at a position where the intermediate line X10 and the set movement route L1 intersect. The reference point S3 is set on the set movement route L1 in the first region R1 (see FIG. 8).

The start position SP3 is set at a position inside the set movement route L1 on the surface 3a of the sealing body 3. In the present embodiment, the angle between the line segment connecting the start position SP3 and the intermediate point S1 and the set movement route L1 in the first region R1 (see FIG. 8) is set to an obtuse angle.

In the closet section of the first main joining step, as shown in FIG. 16, friction stir welding is performed from the start position SP3 to the intermediate point S1. In the closet section, the tip side pin F3 rotated clockwise is inserted into the start position SP3 and moved to the intermediate point S1. At this time, the tip side pin F3 is gradually pushed in so as to reach a preset "predetermined depth" by at least reaching the intermediate point S1.

When the intermediate point S1 is reached, the process proceeds to friction stir welding in this section as it is. As shown in FIGS. 16 and 17, in this section, the rotation tool F is moved so that the rotation center axis Z of the tip side pin F3 and the set movement route L1 overlap. The offset amount between the tip end side pin F3 and the step side surface 12b, and the insertion depth of the base end side pin F2 and the tip end side pin F3 are the same as those in the first embodiment.

The rotation tool F is made to go around the sealing body 3, and when the tip end side pin F3 passes through the intermediate point S1 and reaches the reference point S3, the rotation tool F shifts to the detachment section as it is. In the detachment section, the tip side pin F3 is gradually moved upward from the reference point S3 toward the end position EP3, and the tip end side pin F3 is detached from the sealing body 3 at the end position EP3.

Also in the method for manufacturing the liquid-cooled jacket according to the third embodiment described above, substantially the same effect as that of the first embodiment can be obtained. Further, according to the third embodiment, since friction stir welding can be performed in one step, work efficiency can be improved.

[Fourth Embodiment]
Next, a method for manufacturing the liquid-cooled jacket according to the fourth embodiment of the present invention will be described. The fourth embodiment is different from the second embodiment in that, as shown in FIGS. 18 and 19, the main joining step is performed once instead of being divided into two times. In this embodiment, the points different from the second embodiment will be mainly described.

In the method for manufacturing a liquid-cooled jacket according to the present embodiment, a preparation step, a mounting step, and a main joining step are performed. The preparation step and the placement step are the same as those in the above-described embodiment. In this joining step, the rotating tool F rotated clockwise is inserted into the start position SP4, and friction stir welding is performed with respect to the first butt portion J1.

As shown in FIG. 18, in the first main joining step of the present embodiment, the start position SP4 is set on the second region R2 (see FIG. 8) side of the intermediate point S1 on the set movement route L1. Further, the end position EP4 is set on the first region R1 (see FIG. 8) side of the intermediate point S1 on the set movement route L1.

As shown in FIG. 18, in the main joining step, the intrusion section from the start position SP4 to the intermediate point S1 and the intermediate point S1 on the set movement route L1 to the reference point S3 are circled around the sealing body 3. This section and the three sections of the departure section from the reference point S3 to the end position EP4 are continuously friction-stir-welded. The reference point S3 is set on the second region R2 (see FIG. 8) side of the intermediate point S1 on the set movement route L1.

In the closet section of the main joining step, as shown in FIG. 18, friction stirring is performed from the start position SP4 to the intermediate point S1. In the closet section, the tip side pin F3 rotated clockwise is inserted into the start position SP4 and moved to the intermediate point S1. At this time, the tip side pin F3 is gradually pushed in so as to reach a preset "predetermined depth" by at least reaching the intermediate point S1.

When the intermediate point S1 is reached, the process proceeds to friction stir welding in this section as it is. As shown in FIGS. 18 and 19, in this section, the rotation tool F is moved so that the rotation center axis Z of the tip side pin F3 and the set movement route L1 overlap. The offset amount between the tip end side pin F3 and the step side surface 12b, and the insertion depth of the base end side pin F2 and the tip end side pin F3 are the same as those in the second embodiment.

The rotation tool F is made to go around the sealing body 3, and when the tip end side pin F3 passes through the intermediate point S1 and reaches the reference point S3, the rotation tool F shifts to the detachment section as it is. In the detachment section, the tip side pin F3 is gradually pulled out (raised) in the direction of detaching from the sealing body 3 from the reference point S3 to the ending position EP4, and from the sealing body 3 at the ending position EP4. The tip side pin F3 is detached.

Also in the method for manufacturing the liquid-cooled jacket according to the fourth embodiment described above, substantially the same effect as that of the second embodiment can be obtained. Further, according to the fourth embodiment, since friction stir welding can be performed in one step, work efficiency can be improved.

Although the embodiments of the present invention have been described above, the design can be appropriately changed within a range not contrary to the gist of the present invention. As shown in FIG. 20, the mounting step according to the first modification of the present invention differs from the above-described embodiment in that the step side surface 12b and the outer peripheral side surface 3c are brought into surface contact with each other and abutted against each other. In the modified example, the outer peripheral side surface 3c of the sealing body 3 is formed so as to be inclined outward, and the outer peripheral side surface 3c and the step side surface 12b are abutted in the mounting step. Even in this way, the same effect as that of the above-described embodiment can be obtained. In addition, as in the modification, the height dimension of the step side surface 12b and the plate thickness of the sealing body 3 are made the same, and the peripheral wall end surface 11a and the surface 3a of the sealing body 3 are flush with each other. May be good.

As shown in FIG. 21, in the mounting step according to the second modification of the present invention, the sealing body 3 is mounted on the jacket body 2 in a curved state so that the surface 3a side is convex. It is different from the embodiment. When frictional heat is generated by friction stir welding, the sealing body 3 may warp in a concave shape due to heat shrinkage. However, according to the modification, by making the sealing body 3 convex toward the surface 3a in advance, the liquid-cooled jacket can be flattened by utilizing heat shrinkage.
The jacket body 2 according to the second modification of the present invention has a frame-shaped seal portion 5 formed on a part of the peripheral wall portion 11. The jacket body 2 may be integrally formed by die-casting, or the frame-shaped portion and the plate-shaped portion may be joined and integrated by the seal portion 5 in this way.

Further, in the present embodiment, the friction stir welding is performed while clamping in two steps, but it may be performed once, or the friction stir welding may be performed in three or more steps while clamping. Further, before performing the main joining step, a temporary joining step of temporarily joining the jacket body 2 and the sealing body 3 may be performed. As a result, it is possible to prevent the jacket body 2 and the sealing body 3 from opening in the main joining process. In the temporary joining step, a rotary tool for temporary joining may be used for friction stir welding, or welding may be performed. Further, in the closet section and the withdrawal section, the movement route may be set so that the movement locus of the rotation tool F draws a curve (for example, an arc) in a plan view. As a result, the transition from the closet section to the main section or from the main section to the departure section can be smoothly performed.

1 Liquid-cooled jacket 2 Jacket body 3 Encapsulant F Rotating tool F2 Base end side pin F3 Tip side pin J1 First butt part J2 Second butt part W Plasticization area

Claims (11)

A liquid that is composed of a jacket body having a bottom portion and a peripheral wall portion rising from the peripheral edge of the bottom portion and a sealing body that seals an opening of the jacket body, and joins the jacket body and the sealing body by friction stirring. It ’s a cold jacket manufacturing method.
The jacket body is made of a first aluminum alloy, the sealant is made of a second aluminum alloy, and the first aluminum alloy is a grade having a higher hardness than the second aluminum alloy.
The rotation tool used for friction stir welding has a base end side pin and a tip end side pin.
The taper angle of the base end side pin is larger than the taper angle of the tip end side pin, and a stepped step portion is formed on the outer peripheral surface of the base end side pin.
A peripheral wall 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 plate thickness of the sealing body is adjusted to the peripheral wall step portion. And the preparatory step of forming so as to be larger than the height dimension of the step side surface of
By placing the sealing body on the jacket body, the step side surface of the peripheral wall step portion and the outer peripheral side surface of the sealing body are abutted to form the first abutting portion, and the step bottom surface of the peripheral wall step portion is formed. And the mounting step of forming the second butt portion by superimposing the back surface of the sealing body and the sealing body.
The tip side pin of the rotating tool is inserted into the sealing body, and the outer peripheral surface of the base end side pin is slightly brought into contact with the step side surface of the peripheral wall step portion. Is in contact with the surface of the sealing body, and is made to go around the sealing body at a predetermined depth along a set movement route set inside the outer peripheral side surface of the sealing body. Including the main joining step of rubbing and stirring the first butt portion,
In the main joining step, after inserting the rotating tip side pin into the start position set further inside the set movement route, the rotation center axis of the rotation tool is moved to a position overlapping the set movement route. A method for manufacturing a liquid-cooled jacket, which comprises gradually pushing in the tip-side pin until the depth reaches a predetermined depth. A liquid that is composed of a jacket body having a bottom portion and a peripheral wall portion rising from the peripheral edge of the bottom portion and a sealing body that seals an opening of the jacket body, and joins the jacket body and the sealing body by friction stirring. It ’s a cold jacket manufacturing method.
The jacket body is made of a first aluminum alloy, the sealant is made of a second aluminum alloy, and the first aluminum alloy is a grade having a higher hardness than the second aluminum alloy.
The rotation tool used for friction stir welding has a base end side pin and a tip end side pin.
The taper angle of the base end side pin is larger than the taper angle of the tip end side pin, and a stepped step portion is formed on the outer peripheral surface of the base end side pin.
A peripheral wall 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 plate thickness of the sealing body is adjusted to the peripheral wall step portion. And the preparatory step of forming so as to be larger than the height dimension of the step side surface of
By placing the sealing body on the jacket body, the step side surface of the peripheral wall step portion and the outer peripheral side surface of the sealing body are abutted to form the first abutting portion, and the step bottom surface of the peripheral wall step portion is formed. And the mounting step of forming the second butt portion by superimposing the back surface of the sealing body and the sealing body.
The tip side pin of the rotating tool is inserted into the sealing body, and the outer peripheral surface of the base end side pin is slightly brought into contact with the step side surface of the peripheral wall step portion. Is in contact with the surface of the sealing body, and is made to go around the sealing body at a predetermined depth along a set movement route set inside the outer peripheral side surface of the sealing body. Including the main joining step of rubbing and stirring the first butt portion,
In the main joining step, a first region and a second region are set in the first butt portion, and the first region and the second region are set.
A first joining step of frictionally agitating the first region after clamping the jacket body and the sealing body related to the second region.
After clamping the jacket body and the sealing body related to the first region, a second joining step of rubbing and stirring the second region is performed.
In the first main joining step and the second main joining step, after inserting the rotating tip side pin into the start position set further inside the set movement route, the rotation center axis of the rotation tool is set. A method for manufacturing a liquid-cooled jacket, characterized in that the tip side pin is gradually pushed in until the predetermined depth is reached while moving to a position overlapping the movement route. The liquid according to claim 1 or 2, wherein the predetermined depth of the main joining step is set at a position where the tip end side pin slightly contacts the step bottom surface of the peripheral wall step portion. How to make a cold jacket. In the main joining step, the rotary tool is rotated at a predetermined rotation speed to perform friction stir welding.
When inserting the tip side pin in the main joining step, the tip side pin is inserted in a state of being rotated at a speed higher than the predetermined rotation speed, and the tip side pin is moved to the set movement route while gradually reducing the rotation speed. The method for manufacturing a liquid-cooled jacket according to any one of claims 1 to 3, wherein the liquid-cooled jacket is made to rotate. A liquid that is composed of a jacket body having a bottom portion and a peripheral wall portion rising from the peripheral edge of the bottom portion and a sealing body that seals an opening of the jacket body, and joins the jacket body and the sealing body by friction stirring. It ’s a cold jacket manufacturing method.
The jacket body is made of a first aluminum alloy, the sealant is made of a second aluminum alloy, and the first aluminum alloy is a grade having a higher hardness than the second aluminum alloy.
The rotation tool used for friction stir welding has a base end side pin and a tip end side pin.
The taper angle of the base end side pin is larger than the taper angle of the tip end side pin, and a stepped step portion is formed on the outer peripheral surface of the base end side pin.
A peripheral wall 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 plate thickness of the sealing body is adjusted to the peripheral wall step portion. And the preparatory step of forming so as to be larger than the height dimension of the step side surface of
By placing the sealing body on the jacket body, the step side surface of the peripheral wall step portion and the outer peripheral side surface of the sealing body are abutted to form the first abutting portion, and the step bottom surface of the peripheral wall step portion is formed. And the mounting step of forming the second butt portion by superimposing the back surface of the sealing body and the sealing body.
The tip side pin of the rotating tool is inserted into the sealing body, and the outer peripheral surface of the base end side pin is slightly brought into contact with the step side surface of the peripheral wall step portion. Is in contact with the surface of the sealing body, and is made to go around the sealing body at a predetermined depth along a set movement route set inside the outer peripheral side surface of the sealing body. Including the main joining step of rubbing and stirring the first butt portion,
The feature is that the tip side pin is inserted from the start position set on the set movement route in the main joining step, and the tip side pin is gradually pushed in until the predetermined depth is reached while moving in the traveling direction. How to manufacture a liquid-cooled jacket. A liquid that is composed of a jacket body having a bottom portion and a peripheral wall portion rising from the peripheral edge of the bottom portion and a sealing body that seals an opening of the jacket body, and joins the jacket body and the sealing body by friction stirring. It ’s a cold jacket manufacturing method.
The jacket body is made of a first aluminum alloy, the sealant is made of a second aluminum alloy, and the first aluminum alloy is a grade having a higher hardness than the second aluminum alloy.
The rotation tool used for friction stir welding has a base end side pin and a tip end side pin.
The taper angle of the base end side pin is larger than the taper angle of the tip end side pin, and a stepped step portion is formed on the outer peripheral surface of the base end side pin.
A peripheral wall 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 plate thickness of the sealing body is adjusted to the peripheral wall step portion. And the preparatory step of forming so as to be larger than the height dimension of the step side surface of
By placing the sealing body on the jacket body, the step side surface of the peripheral wall step portion and the outer peripheral side surface of the sealing body are abutted to form the first abutting portion, and the step bottom surface of the peripheral wall step portion is formed. And the mounting step of forming the second butt portion by superimposing the back surface of the sealing body and the sealing body.
The tip side pin of the rotating tool is inserted into the sealing body, and the outer peripheral surface of the base end side pin is slightly brought into contact with the step side surface of the peripheral wall step portion. Is in contact with the surface of the sealing body, and is made to go around the sealing body at a predetermined depth along a set movement route set inside the outer peripheral side surface of the sealing body. Including the main joining step of rubbing and stirring the first butt portion,
In the main joining step, a first region and a second region are set in the first butt portion, and the first region and the second region are set.
A first joining step of frictionally agitating the first region after clamping the jacket body and the sealing body related to the second region.
After clamping the jacket body and the sealing body related to the first region, a second joining step of rubbing and stirring the second region is performed.
In the first main joining step and the second main joining step, the tip side pin is inserted from the start position set on the set movement route, and the pin is gradually moved to the predetermined depth while moving in the traveling direction. A method for manufacturing a liquid-cooled jacket, which comprises pushing in a pin on the tip side. The liquid according to claim 5 or 6, wherein the predetermined depth of the main joining step is set at a position where the tip end side pin slightly contacts the step bottom surface of the peripheral wall step portion. How to make a cold jacket. In the main joining step, the tip side pin is rotated at a predetermined rotation speed to perform friction stir welding.
The insertion step of the main joining step is characterized in that the tip side pin is inserted in a state of being rotated at a speed higher than the predetermined rotation speed, and the rotation tool is pushed in while gradually reducing the rotation speed. The method for manufacturing a liquid-cooled jacket according to any one of claims 5 to 7. The preparatory step is characterized in that a peripheral wall 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 method for manufacturing a liquid-cooled jacket according to any one of claims 1 to 8. The method according to any one of claims 1 to 9, wherein in the preparation step, the jacket body is die-cast and at least the sealed body is formed so as to be convex toward the surface side. How to make a liquid-cooled jacket. The method for manufacturing a liquid-cooled jacket according to any one of claims 1 to 10, further comprising a temporary joining step of temporarily joining the first butt portion prior to the main joining step.

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