JP7226242B2 - Liquid cooling jacket manufacturing method - Google Patents

Description

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

Liquid cooling jackets are manufactured using friction stir welding. For example, Patent Literature 1 discloses a method of manufacturing a liquid cooling jacket. FIG. 19 is a cross-sectional view showing a method of manufacturing a conventional liquid cooling jacket. In the conventional method for manufacturing a liquid cooling jacket, a butt portion J10 is formed by abutting a stepped side surface 101c provided at a stepped portion of the jacket body 101 made of aluminum alloy and a side surface 102c of the sealing body 102 made of aluminum alloy. It is to perform friction stir welding for. Further, in the conventional method for manufacturing a liquid cooling jacket, friction stir welding is performed by inserting only the stirring pin F42 of the rotating tool F40 into the butted portion J10. Further, in the conventional method of manufacturing a liquid cooling jacket, the rotating center axis Z of the rotary tool F40 is superimposed on the butted portion J10 and relatively moved.

JP 2015-131321 A

Here, the jacket body 101 tends to have a complicated shape. There are cases where it is formed by In this way, there is a case where a liquid cooling jacket is manufactured by joining aluminum alloy members of different grades. In such a case, the hardness of the jacket body 101 is generally higher than that of the sealing body 102. Therefore, if friction stir welding is performed as shown in FIG. The material resistance received from the jacket body 101 side is greater than the material resistance received from the side. Therefore, it becomes difficult to stir different types of materials with the stirring pin F42 of the rotary tool F40 in a well-balanced manner, and there is a problem that void defects occur in the plasticized region after bonding, resulting in a decrease in bonding strength.

In addition, as shown in FIG. 19, when inserting the agitating pin F42 into the abutting portion J10, the agitating pin F42 is pushed in in the vertical direction to a predetermined depth, so the frictional heat at the start position of the friction stir becomes excessive. . As a result, the metal on the jacket main body 101 side is likely to mix into the sealing body 102 side at the start position, which causes a problem of joint failure.

From this point of view, it is an object of the present invention to provide a method of manufacturing a liquid cooling jacket that can suitably join different types of aluminum alloys.

In order to solve the above problems, the present invention comprises a jacket body having a bottom and a peripheral wall rising from the peripheral edge of the bottom, and a sealing body for sealing an opening of the jacket body. A method for manufacturing a liquid cooling jacket in which the sealing body is joined by friction stir, wherein the jacket main 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 with higher hardness than the second aluminum alloy, and the rotary tool used in friction stir includes a proximal pin and a distal pin, and the proximal pin has a taper angle of The taper angle of the pin on the distal side is larger than the taper angle of the pin on the proximal side, and a stepped portion is formed on the outer peripheral surface of the pin on the proximal side. a first inclined stepped side surface that rises from an upper end of the first inclined stepped side surface so as to widen toward the opening; a preparation step of forming a peripheral wall stepped portion having a stepped portion, and forming the plate thickness of the sealing body so as to be larger than the height dimension of the first inclined stepped side surface of the peripheral wall stepped portion; The first inclined stepped side surface of the peripheral wall stepped portion and the outer peripheral side surface of the sealing body are butted against each other to form a first abutting portion, and the stepped bottom surface of the peripheral wall stepped portion and the back surface of the sealing body to form a second abutting portion; inserting the tip-side pin of the rotating rotating tool into the sealing body, the outer peripheral surface of the tip-side pin is slightly in contact with the first inclined stepped side surface of the peripheral wall stepped portion, and the outer peripheral surface of the proximal pin is in contact with the surface of the sealing body. a final joining step of friction-stirring the first abutting portion by making one turn around the sealing body at a predetermined depth along a set movement route set inside, wherein the main joining step includes: An end position is set further inside the set movement route, and after friction stir welding to the first abutting portion, the tip side pin is gradually pulled out from the sealing body while moving the rotating tool to the end position. to disengage the rotating tool from the sealing body at the end position.

According to this manufacturing method, the second aluminum alloy mainly on the sealing body side of the first abutting portion is agitated and plastically fluidized by frictional heat between the sealing body and the proximal-side pin and the distal-side pin. The first slanted stepped side surface and the outer peripheral side surface of the sealing body can be joined at the above. In addition, since the outer peripheral surface of the tip-side pin is kept in contact with the first inclined stepped side surface of the jacket body, it is possible to minimize the mixing of the first aluminum alloy from the jacket body into the sealing body. As a result, mainly the second aluminum alloy on the side of the sealing body is friction-stirred at the first abutting portion, so that a decrease in joint strength can be suppressed. Further, by gradually withdrawing the tip side pin while moving the rotating tool from the position overlapping the set movement route to the inner end position, it is possible to prevent frictional heat from becoming excessive on the set movement route.

In the manufacturing method of the liquid cooling jacket of the present invention, in the main joining step, the rotating tool is rotated while the outer peripheral surface of the base end pin is brought into slight contact with the second inclined stepped side surface of the peripheral wall stepped portion. Let γ be the inclination angle of the central axis with respect to the vertical plane, β be the inclination angle of the first inclined stepped side surface with respect to the vertical plane, β′ be the inclination angle of the second inclined stepped side surface with respect to the vertical plane, and β′ be the inclination angle of the tip side pin. Assuming that the inclination angle of the outer peripheral surface with respect to the rotation center axis is α, and the inclination angle of the outer peripheral surface of the proximal pin with respect to the rotation center axis is α', γ=α-β and γ=α'-β'. It is preferable to perform friction stir welding in this state.

According to this manufacturing method, the inclination angle γ with respect to the vertical plane of the rotation center axis of the rotary tool is obtained by obtaining the inclination angle β of the first inclined stepped side surface with respect to the vertical plane from the inclination angle α of the outer peripheral surface of the tip side pin with respect to the rotation center axis. Optimal values can be selected for the tilt angles α and β by matching the subtracted values. Further, the inclination angle γ of the rotation center axis of the rotating tool with respect to the vertical plane is obtained by subtracting the inclination angle β' of the second inclined stepped side surface with respect to the vertical plane from the inclination angle α' of the outer peripheral surface of the proximal pin with respect to the rotation center axis. Optimal values can be selected for the tilt angles α' and β' by matching the values. Further, the outer peripheral surface of the distal pin and the first inclined stepped side surface are made parallel, the outer peripheral surface of the proximal pin and the second inclined stepped side surface are made parallel, and the outer peripheral surface of the distal pin and the first inclined stepped side surface are arranged in parallel. and contact between the outer peripheral surface of the proximal pin and the second inclined stepped side surface. At the same time, the outer peripheral surface of the distal pin and the first inclined stepped side surface can be brought as close as possible in the height direction, and the outer peripheral surface of the proximal pin and the second inclined stepped side surface can be arranged in the height direction. can be brought as close together as possible.

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

According to this manufacturing method, it is possible to increase the bonding strength of the second abutting portion while preventing the first aluminum alloy from being mixed into the sealing body as much as possible.

Further, in the main welding step, the tip side pin is rotated at a predetermined rotation speed to perform friction stir, and when the tip side pin is detached in the main welding step, the rotation speed is gradually higher than the predetermined rotation speed. It is preferable to move to the end position while increasing the speed.

According to this manufacturing method, friction stirring can be performed more suitably.

In order to solve the above problems, the second aspect of the present invention comprises a jacket body having a bottom and a peripheral wall rising from the peripheral edge of the bottom, and a sealing body for sealing an opening of the jacket body, A method for manufacturing a liquid cooling jacket in which a jacket body and the sealing body are joined by friction stir, wherein 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 with higher hardness than the second aluminum alloy, and the rotary tool used in friction stir includes a proximal pin and a distal pin, and the proximal pin tapers The angle is larger than the taper angle of the pin on the distal end side, and a stepped portion is formed on the outer peripheral surface of the pin on the proximal end side. A first inclined stepped side surface rising from the bottom surface of the step so as to widen toward the opening, and a second inclined stepped side surface rising from the upper end of the first inclined stepped side surface so as to further widen toward the opening. a preparation step of forming a peripheral wall stepped portion having a stepped side surface and forming the plate thickness of the sealing body so as to be larger than the height dimension of the first inclined stepped side surface of the peripheral wall stepped portion; By placing the sealing body on the jacket main body, the first inclined stepped side surface of the peripheral wall stepped portion and the outer peripheral side surface of the sealing body are butted to form a first abutting portion, and the peripheral wall stepped portion is formed. a placing step of overlapping the bottom surface of the step with the back surface of the sealing body to form a second butting portion; inserting the tip side pin of the rotating rotating tool into the sealing body to slightly contacting the first inclined stepped side surface of the peripheral wall stepped portion, while the outer peripheral surface of the proximal pin is in contact with the surface of the sealing body, the outer periphery of the sealing body a final joining step of friction-stirring the first abutting portion by making one turn around the sealing body at a predetermined depth along a set moving route set inside the side surface, wherein the main joining step In step 3, an end position is set on the set movement route, and after friction stir welding to the first butt portion, the tip side pin is gradually pulled out from the sealing body while moving the rotating tool to the end position. to disengage the rotating tool from the sealing body at the end position.

According to this manufacturing method, the second aluminum alloy mainly on the sealing body side of the first abutting portion is agitated and plastically fluidized by frictional heat between the sealing body and the proximal-side pin and the distal-side pin. , the stepped side surface and the outer peripheral side surface of the sealing body can be joined. In addition, since the outer peripheral surface of the tip-side pin is kept in contact with the first inclined stepped side surface of the jacket body, it is possible to minimize the mixing of the first aluminum alloy from the jacket body into the sealing body. As a result, mainly the second aluminum alloy on the side of the sealing body is friction-stirred at the first abutting portion, so that a decrease in joint strength can be suppressed. Further, by gradually withdrawing the distal pin while moving the rotary tool along the set movement route, it is possible to prevent excessive frictional heat at one point on the set movement route.

Also in the method for manufacturing a liquid cooling jacket according to the second aspect of the present invention, in the main joining step, the outer peripheral surface of the base end pin is brought into slight contact with the second inclined stepped side surface of the peripheral wall stepped portion, and the rotation is performed. Let γ be the inclination angle of the center axis of rotation of the tool with respect to the vertical plane, β be the inclination angle of the first inclined stepped side surface with respect to the vertical plane, β′ be the inclination angle of the second inclined stepped side surface with respect to the vertical plane, and β′ be the tip. Let α be the inclination angle of the outer peripheral surface of the side pin with respect to the rotation center axis, and let α′ be the inclination angle of the outer peripheral surface of the proximal side pin with respect to the rotation center axis, then γ=α−β and γ=α′− Friction stir welding is preferably performed in the state of β'.

According to this manufacturing method, the inclination angle γ of the rotation center axis of the rotating tool with respect to the vertical plane is obtained by subtracting the inclination angle β of the stepped side surface with respect to the vertical plane from the inclination angle α of the outer peripheral surface of the tip side pin with respect to the rotation center axis. , optimal values can be selected for the tilt angles α and β. Further, the inclination angle γ of the rotation center axis of the rotating tool with respect to the vertical plane is obtained by subtracting the inclination angle β' of the second inclined stepped side surface with respect to the vertical plane from the inclination angle α' of the outer peripheral surface of the proximal pin with respect to the rotation center axis. Optimal values can be selected for the tilt angles α' and β' by matching the values. Further, the outer peripheral surface of the distal pin and the first inclined stepped side surface are made parallel, the outer peripheral surface of the proximal pin and the second inclined stepped side surface are made parallel, and the outer peripheral surface of the distal pin and the first inclined stepped side surface are arranged in parallel. and contact between the outer peripheral surface of the proximal pin and the second inclined stepped side surface. At the same time, the outer peripheral surface of the distal pin and the first inclined stepped side surface can be brought as close as possible in the height direction, and the outer peripheral surface of the proximal pin and the second inclined stepped side surface can be arranged in the height direction. can be brought as close together as possible.

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

According to this manufacturing method, it is possible to increase the bonding strength of the second abutting portion while preventing the first aluminum alloy from being mixed into the sealing body as much as possible.

Further, in the main welding step, the tip side pin is rotated at a predetermined rotation speed to perform friction stir, and when the tip side pin is detached in the main welding step, the rotation speed is gradually higher than the predetermined rotation speed. It is preferable to move to the end position while increasing the speed.

According to this manufacturing method, friction stirring can be performed more suitably.

Moreover, in the preparation step, it is preferable that the jacket body is formed by die casting and at least the sealing body is formed so as to protrude on the surface side.

According to this manufacturing method, the liquid cooling jacket can be flattened by making use of heat shrinkage caused by frictional heat by making the sealing body convex in advance.

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

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

According to the method for manufacturing a liquid cooling jacket according to the present invention, it is possible to suitably join different types of aluminum alloys.

1 is a side view of a rotary tool according to an embodiment of the invention; FIG. FIG. 4 is an enlarged cross-sectional view of the rotary tool; It is a cross-sectional view showing a first modification of the rotary tool. It is a sectional view showing the second modification of the rotary tool. It is a sectional view showing the third modification of a rotation tool. 1 is an exploded perspective view showing a liquid cooling jacket according to a first embodiment of the invention; FIG. FIG. 4 is a cross-sectional view showing a placing step in the method for manufacturing the liquid cooling jacket according to the first embodiment; FIG. 5 is a plan view showing a placing step of the method for manufacturing the liquid cooling jacket according to the first embodiment; FIG. 4 is a plan view showing a main bonding step of the method for manufacturing the liquid cooling jacket according to the first embodiment; FIG. 4 is a cross-sectional view showing a state near the starting point of the rotary tool in the main joining step of the method for manufacturing the liquid cooling jacket according to the first embodiment; FIG. 4 is a cross-sectional view showing a main bonding step in the method for manufacturing the liquid cooling jacket according to the first embodiment; FIG. 4 is a plan view showing a main bonding step of the method for manufacturing the liquid cooling jacket according to the first embodiment; FIG. 4 is a cross-sectional view showing a state near the end point of the rotary tool in the main joining step of the method for manufacturing the liquid cooling jacket according to the first embodiment; FIG. 4 is a cross-sectional view showing a plasticized region formed by the liquid cooling jacket manufacturing method according to the first embodiment; FIG. 8 is a plan view showing a main bonding step of the method for manufacturing the liquid cooling jacket according to the second embodiment; FIG. 10 is a plan view showing the state after the main bonding step in the method for manufacturing the liquid cooling jacket according to the second embodiment; FIG. 10 is a cross-sectional view showing a preparation step and a butting step of a method for manufacturing a liquid cooling jacket according to the third embodiment; FIG. 5 is a cross-sectional view showing a bonding step in the method for manufacturing the liquid cooling jacket according to the first embodiment; FIG. 10 is a cross-sectional view showing a method of manufacturing a conventional liquid cooling jacket;

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

The base end pin F2 is continuous with the base shaft portion F1 and tapers toward the tip. The proximal pin F2 has a truncated cone shape. The taper angle A of the proximal pin F2 may be set appropriately, 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 increases. The taper angle A is larger than the taper angle B of the distal pin F3, which will be described later. As shown in Figure 2,
A stepped pin stepped portion F21 is formed over the entire height direction on the outer peripheral surface of the proximal pin F2. The pin stepped portion F21 is spirally formed clockwise or counterclockwise. That is, the pin stepped portion F21 has a spiral shape when viewed from above, and has a stepped shape when viewed from the side. In the first embodiment, the pin stepped portion F21 is set counterclockwise from the base end side to the tip end side in order to rotate the rotary tool F right.

When rotating the rotating tool F to the left, it is preferable to set the pin stepped portion F21 clockwise from the proximal side to the distal side. As a result, the plastic flow material is guided to the tip end side by the pin stepped portion F21, so that the amount of metal overflowing to the outside of the metal members 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, F21c of the adjacent pin stepped portions F21 is appropriately set according to the stepped angle C and the height Y1 of the stepped side surface F21b, which will be described later.

The height Y1 of the stepped side surface F21b may be set as appropriate, and is set to 0.1 to 0.4 mm, for example. 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 stepped portions (the number of pin stepped portions F21 in contact with the metal members to be joined) also decreases.

The step angle C between the step bottom surface F21a and the step side surface F21b may be set appropriately, but is set to 85 to 120°, for example. The stepped bottom surface F21a is parallel to the horizontal plane in this embodiment. The stepped bottom surface F21a may be inclined in the range of -5° to 15° with respect to the horizontal plane toward the outer peripheral direction from the rotation center axis of the tool (minus is downward with respect to the horizontal plane, plus is with respect to the horizontal plane up). The distance X1, the height Y1 of the stepped side surface F21b, the stepped angle C, and the angle of the stepped bottom surface F21a with respect to the horizontal plane are such that the plastic flow material does not stay inside the pin stepped portion F21 and adhere to the outside when performing friction stir. In addition, the step bottom F21a presses the plastic flow material to reduce the joint surface roughness.

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

In addition, when rotating the rotating tool F 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 flow material is guided to the tip side by the spiral groove F31, so that the amount of metal overflowing to the outside of the metal members 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 apexes F31c, F31c of the adjacent spiral grooves F31 is defined as length X2. Let the height of the spiral side surface F31b be a height Y2. A spiral angle D formed by the spiral bottom surface F31a and the spiral side surface F31b is, for example, 45 to 90°. The spiral groove F31 has the role of increasing the frictional heat by coming into contact with the metal members to be joined and guiding the plastic flow material to the tip side.

The design of the rotary tool F can be changed as appropriate. FIG. 3 is a side view showing a first modification of the rotary tool of the invention. As shown in FIG. 3, in the rotary tool FA according to the first modified example, the step angle C between the step bottom surface F21a and the step side surface F21b of the pin step portion F21 is 85°. The stepped bottom surface F21a is parallel to the horizontal plane. In this way, the stepped bottom surface F21a is parallel to the horizontal surface, and the stepped angle C may be an acute angle within a range in which the plastic flow material stays and adheres to the pin stepped portion F21 during friction stirring and escapes to the outside. .

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

FIG. 5 is a side view showing a third modification of the rotary tool of the invention. As shown in FIG. 5, in the rotary tool FC according to the third modification, the stepped bottom surface F21a is inclined upward by 10° with respect to the horizontal plane from the rotation center axis of the tool toward the outer peripheral direction. The stepped side surface F21b is parallel to the vertical plane. In this way, the bottom surface F21a of the step may be formed so as to be inclined upward from the horizontal plane toward the outer peripheral direction from the rotation center axis of the tool within the range where the plastic flow material can be pressed during friction stirring. The first to third modifications of the rotating tool described above can also produce effects equivalent to those of the following embodiments.

[First embodiment]
Embodiments of the present invention will be described with reference to the drawings as appropriate. The liquid cooling jacket 1 according to the first embodiment is composed of a jacket body 2 and a sealing body 3, as shown in FIG. The liquid cooling jacket 1 is a device that circulates a fluid inside to cool a heat generating element arranged therein. The jacket body 2 and the sealing body 3 are integrated by friction stir welding. The "front surface" in the following description 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 that can be friction-stirred, but in this embodiment it is formed mainly of a first aluminum alloy. As the first aluminum alloy, for example, an aluminum alloy cast material such as JISH5302 ADC12 (Al-Si-Cu system) is used.

The bottom portion 10 is a rectangular plate-like member. The peripheral wall portion 11 is a wall portion that rises in a rectangular frame shape from the peripheral portion of the bottom portion 10 . A concave portion 13 is formed by the bottom portion 10 and the peripheral wall portion 11 . A peripheral wall stepped portion 12 is formed on the inner peripheral edge of the peripheral wall portion 11 . The peripheral wall stepped portion 12 is composed of a stepped bottom surface 12a, a first inclined stepped side surface 12b that rises obliquely from the stepped bottom surface 12a, and a second inclined stepped side surface 12c that further tilts and rises from the upper end of the first inclined stepped side surface 12b. ing. The first inclined stepped side surface 12b is inclined so as to widen toward the opening of the jacket body 2 (upward). The second inclined stepped side surface 12c is inclined so as to widen further toward the opening than the first inclined stepped side surface 12b. As shown in FIG. 7, the inclination angle β of the first inclined stepped side surface 12b and the inclined angle β' of the second inclined stepped side surface 12c may be appropriately set. is smaller than the inclination angle β' of the second inclined stepped side surface 12c. Further, in the present embodiment, the inclination angle β of the first inclined stepped side surface 12b is the same as the inclined angle α (half of the taper angle B) of the distal pin F3 of the rotating tool F shown in FIG. The inclination angle β' of the side surface 12c is the same as the inclination angle α' (half the taper angle A) of the proximal pin F2 of the rotating tool F.

Although the jacket main body 2 of the present embodiment is integrally formed, for example, the peripheral wall portion 11 may be divided and joined by a sealing 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 that can be friction-stirred, but in this embodiment, it is formed mainly containing a second aluminum alloy. The second aluminum alloy is a material with a lower hardness than the first aluminum alloy. The second aluminum alloy is made of, for example, an aluminum alloy wrought material such as JIS A1050, A1100, A6063. As used herein, hardness refers to Brinell hardness, which can be measured by a method according to JIS Z 2243.

Next, a method for manufacturing the liquid cooling jacket according to this embodiment will be described. In the manufacturing method of the liquid cooling jacket according to the present embodiment, a preparation process, a placement process, and a main bonding process are performed.

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

The mounting step is a step of mounting the sealing member 3 on the jacket body 2 as shown in FIG. In the mounting step, the outer peripheral side surface 3c of the sealing body 3 and the first inclined stepped side surface 12b of the peripheral wall stepped portion 12 are brought into contact with each other to form the first butted portion J1. Since the first inclined stepped side surface 12b is inclined outward, a gap having a V-shaped cross section is formed in the first abutting portion J1. Since the second inclined stepped side surface 12 c is inclined further outward than the first inclined stepped side surface 12 b , it does not come into contact with the outer peripheral side surface 3 c of the sealing body 3 . The first butting portion J1 is formed in a rectangular shape in a plan view along the periphery of the sealing body 3 . Further, the stepped bottom surface 12a of the peripheral wall stepped portion 12 and the rear surface 3b of the sealing body 3 are butted together to form a second butted portion J2. The plate thickness of the sealing body 3 may be appropriately set, but in this embodiment, it is larger than the sum of the height dimension of the first inclined stepped side surface 12b and the height dimension of the second inclined stepped side surface 12c. . The surface 3 a of the sealing body 3 is located above the surface 11 a of the peripheral wall portion 11 of the jacket body 2 .

As shown in FIG. 8, a "set movement route L1" (chain line) is set inside the first matching portion J1. The set movement route L1 is a movement route of the rotating tool F necessary for joining the first butted portion J1 in the main joining step described later. As will be described later, in this embodiment, the distal pin F3 is brought into slight contact with the first inclined stepped side surface 12b, and the proximal pin F2 is brought into slight contact with the second inclined stepped side surface 12c. is set to have a rectangular shape in plan view inside the outer peripheral side surface 3c.

9, 11, and 12, the main welding step is a step of friction stir welding the first butted portion J1 using a rotating tool F. FIG. As shown in FIGS. 9 and 12, in the main joining process, there is a push-in section from the starting position SP1 to the intermediate point S1, and from the intermediate point S1 on the set movement route L1 to the intermediate point S2 (see FIG. 12) after making one round. and a separation section from the middle point S2 to the end position EP1 (see FIG. 12) are continuously friction-stirred. The intermediate points S1 and S2 are set on the set movement route L1. The start position SP1 is set at a position inside the set movement route L1 on the surface 3a of the sealing body 3. As shown in FIG. In this embodiment, the angle between the line segment connecting the start position SP1 and the intermediate point S1 and the set movement route L1 is set to be an obtuse angle.

In the pressing section of the main joining step, as shown in FIG. 9, friction stir is performed from the start position SP1 to the intermediate point S1. In the push-in section, the tip side pin F3 rotated to the right is inserted into the starting position SP1 and moved to the intermediate point S1. At this time, as shown in FIG. 10, the tip side pin F3 is gradually pushed in so as to reach a preset "predetermined depth" at least until reaching the intermediate point S1. In other words, the rotating tool F is gradually lowered while being moved along the set movement route L1 without remaining in one place.

When the intermediate point S1 is reached, the friction stir welding of this section is performed as it is. As shown in FIGS. 9 and 11, in this section, the rotating tool F is moved so that the center axis Z of rotation of the distal pin F3 and the set movement route L1 overlap. At this time, since the jacket main body 2 is provided with the second inclined stepped side surface 12c, it is possible to prevent the base end pin F2 from coming into large contact with the jacket main body 2, and to allow the base end pin F2 to slightly contact the second inclined stepped side surface 12c. can be done. In this section, the "predetermined depth" of the tip side pin F3 is set to such an extent that the flat surface F4 at the tip of the tip side pin F3 slightly contacts the stepped bottom surface 12a. The "predetermined depth" of the tip side pin F3 may be set as appropriate. For example, the tip side pin F3 may be set at a position that does not reach the stepped bottom surface 12a.

In this section of the main joining step, as shown in FIG. 11, the outer peripheral surface of the distal pin F3 slightly contacts the first inclined stepped side surface 12b, and the outer peripheral surface of the proximal pin F2 contacts the second inclined stepped side surface 12c. The set movement route L1 is set so that the surfaces are slightly in contact with each other. In addition, in this section of the first main bonding step, the insertion depth is set so that the outer peripheral surface of the base end side pin F2 of the rotating tool F contacts the surface 3a of the sealing body 3. As shown in FIG. Here, the amount of contact of the outer peripheral surface of the tip side pin F3 with respect to the first inclined stepped side surface 12b is defined as an offset amount N. As shown in FIG. This offset amount N is equivalent to the contact allowance of the outer peripheral surface of the base end pin F2 with respect to the second inclined stepped side surface 12c. As in the present embodiment, the flat surface F4 of the tip-side pin F3 is inserted deeper than the stepped bottom surface 12a of the peripheral wall stepped portion 12, and the outer peripheral surface of the tip-side pin F3 is brought into contact with the first inclined stepped side surface 12b, In addition, when the outer peripheral surface of the proximal pin F2 is brought into contact with the second inclined stepped side surface 12c, the offset amount N is set between 0<N≦1.0 mm, preferably 0<N≦0.85 mm. , more preferably 0<N≦0.65 mm.

If the outer peripheral surface of the distal pin F3 and the first inclined stepped side surface 12b are set so as not to contact each other, and the outer peripheral surface of the base end side pin F2 and the second inclined stepped side surface 12c are set so as not to contact each other, the first abutting portion J1 is Bonding strength becomes low. In addition, if the offset amount N between the outer peripheral surface of the distal pin F3 and the first inclined stepped side surface 12b and the offset amount N between the outer peripheral surface of the proximal pin F2 and the second inclined stepped side surface 12c exceed 1.0 mm, the jacket A large amount of the first aluminum alloy of the main body 2 may be mixed into the sealing body 3 side, resulting in poor bonding.

As shown in FIG. 12, when the rotary tool F is rotated around the sealing body 3, the starting end and the terminal end of the plasticized region W are overlapped, and when the tip side pin F3 reaches the intermediate point S2, the separation section remains as it is. transition to In the detachment section, as shown in FIG. 13, the tip side pin F3 is gradually moved upward from the intermediate point S2 to the end position EP1. let go. In other words, the rotating tool F is gradually pulled out (raised) while being moved to the end position EP1 without remaining 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 is an obtuse angle. A plasticized region W is formed in the movement trajectory of the rotating tool F. As shown in FIG.

As shown in FIG. 14, the plasticized region W is formed to reach the jacket main body 2 beyond the first butt portion J1 and the second butt portion J2. The surface of the plasticized region W is formed with an inclined surface, which is higher on the side of the sealing body 3 and lower on the side of the jacket main body 2 .

According to the manufacturing method of the liquid cooling jacket according to the present embodiment described above, the frictional heat between the sealing body 3 and the tip end pin F3 agitates the second aluminum alloy mainly on the side of the sealing body 3 of the first abutting portion J1. The first inclined stepped side surface 12b and the outer peripheral side surface 3c of the sealing body 3 can be joined at the first abutting portion J1. In addition, the outer peripheral surface of the distal pin F3 is brought into slight contact with the first inclined stepped side surface 12b of the jacket body 2, and the outer peripheral surface of the base end pin F2 is brought into slight contact with the second inclined stepped side surface 12c of the jacket body 2. Therefore, the mixing of the first aluminum alloy from the jacket body 2 into the sealing body 3 can be minimized. As a result, mainly the second aluminum alloy on the side of the sealing body 3 is friction-stirred at the first butted portion J1, so that a decrease in joint strength can be suppressed. That is, in the main joining step, the imbalance in the material resistance received by the distal end pin F3 can be minimized between one side and the other side with respect to the rotation center axis Z of the distal end side pin F3. As a result, the plastic flow material is friction-stirred in a well-balanced manner, so that a decrease in bonding strength can be suppressed. In addition, by increasing the plate thickness of the sealing body 3, it is possible to prevent metal shortage at the joint.

In addition, in the conventional liquid cooling jacket manufacturing method, since the hardness of the jacket main body and the sealing body are different, the material resistance that the distal end side pin and the proximal side pin receive on one side and the other side of the rotation center axis. was also very different. Therefore, the plastic flow material is not stirred in a well-balanced manner, which has been a factor in lowering the bonding strength. However, according to the present embodiment, the contact margin between the outer peripheral surfaces of the distal side pin F3 and the proximal side pin F2 and the jacket body 2 is minimized, so that the distal side pin F3 and the proximal side pin F2 are brought into contact with the jacket. The material resistance received from the main body 2 can be minimized.

In addition, in the present embodiment, in the main joining step, the outer peripheral surface of the base end pin F2 and the sealing body 3 are brought into contact with each other, and friction stir is performed while pressing the plastic flow material, thereby suppressing the generation of burrs. can. In addition, since the plastic flow material can be pressed by the outer peripheral surface of the proximal pin F2, the stepped groove formed on the joint surface (the surface 3a of the sealing body 3) can be reduced, and the stepped groove can be reduced. It is possible to eliminate or reduce the bulging portion formed on the side of the . Further, since the stepped pin stepped portion F21 of the base end pin F2 is shallow and has a wide outlet, the plastic flowable material is easily pulled out of the pin stepped portion F21 while the stepped bottom face F21a holds down the plastic flowable material. there is Therefore, even if the base end pin F2 presses the plastic flow material, the plastic flow material is less likely to adhere to the outer peripheral surface of the base end pin F2. Therefore, the joint surface roughness can be reduced, and the joint quality can be preferably stabilized.

In addition, in the pushing section of the main joining step, while moving the rotating tool F from the starting position SP1 to a position that overlaps with the set movement route L1, the distal end side pin F3 is gradually pushed in until reaching a predetermined depth, whereby the setting movement is performed. It is possible to prevent the rotary tool F from stopping on the route L1 and causing excessive frictional heat.
Similarly, in the detachment section of the main joining process, while moving the rotary tool F from the set movement route L1 to the end position EP1, the distal end side pin F3 is gradually lifted from a predetermined depth to be detached. It is possible to prevent the rotary tool F from stopping on L1 and excessive frictional heat.
As a result, it is possible to prevent the frictional heat from becoming excessively large on the set movement route L1, and the excessive mixing of the first aluminum alloy from the jacket main body 2 to the sealing body 3, resulting in poor bonding.

In addition, the friction stir welding is performed in a state in which the distal pin F3 is brought into slight contact with both the first inclined stepped side surface 12b and the stepped bottom surface 12a, and the proximal pin F2 is brought into slight contact with the second inclined stepped side surface 12c. By doing so, the first butted portion J1 and the second butted portion J2 can be reliably joined. In addition, the second inclined stepped side surface 12c and the proximal pin F2 are brought into slight contact, the first inclined stepped side surface 12b and the tip pin F3 are brought into slight contact, and the stepped bottom surface 12a and the tip pin F3 are brought into contact with each other. Since the contact is limited to a slight amount, mixing of the first aluminum alloy from the jacket body 2 into the sealing body 3 can be prevented as much as possible.

In the main joining step, the position of the start position SP1 may be set as appropriate. Transition smoothly to this section without slowing down. As a result, it is possible to prevent frictional heat from becoming excessive due to the rotation tool F stopping or moving at a reduced speed on the set movement route L1. Also, by setting the end position EP1 in the same manner as the start position SP1, the rotating tool F can be smoothly moved from the main section to the separation section.

In addition, in the main joining process of the present embodiment, the rotating direction and advancing direction of the rotating tool F may be appropriately set. The direction of rotation and the direction of movement of the rotary tool F were set so that the side of the sealing body 3 was the side of the flow. By setting the jacket main body 2 side to the shear side, the agitation action of the tip side pin F3 around the first butt portion J1 is enhanced, and the temperature rise at the first butt portion J1 can be expected, resulting in the first butt portion J1. , the first inclined stepped 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 velocity of the outer circumference of the rotating tool with respect to the part to be welded is the sum of the tangential velocity at the outer circumference of the rotating tool and the moving velocity. . 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 parts to be welded becomes low due to the rotation of the rotating tool in the direction opposite to the moving direction of the rotating tool.

Moreover, the first aluminum alloy of the jacket body 2 is a material with higher hardness than the second aluminum alloy of the sealing body 3 . Thereby, the durability of the liquid cooling jacket 1 can be enhanced. Moreover, it is preferable that the first aluminum alloy of the jacket main body 2 is a cast aluminum alloy material, and the second aluminum alloy of the sealing body 3 is a wrought aluminum alloy material. By using, for example, an Al--Si--Cu based aluminum alloy cast material such as JISH5302 ADC12 as the first aluminum alloy, the castability, strength, machinability, etc. of the jacket body 2 can be enhanced. Further, by using, for example, JIS A1000 series or A6000 series as the second aluminum alloy, workability and thermal conductivity can be improved.

Further, in the main joining step, the entire circumference of the first butted portion J1 can be friction stir welded, so that the airtightness and watertightness of the liquid cooling jacket can be enhanced. Further, by overlapping the ends of the plasticized region W on the starting point side and the end point side, the airtightness and watertightness can be further improved.

In addition, by setting the inclination angle α of the tip-side pin F3 and the inclination angle β of the first inclined stepped side surface 12b to be the same (parallel), the first inclined stepped side surface 12b is uniformly inclined over the entire height direction. A distal pin F3 can be brought into contact. Furthermore, by setting the inclination angle α′ of the base end pin F2 and the inclination angle β′ of the second inclined stepped side surface 12c to be the same (parallel), the second inclined stepped side surface 12c can be covered entirely in the height direction. The base end pin F2 can be brought into uniform contact with the base end pin F2. As a result, friction stir welding can be performed in a well-balanced manner.

In addition, in the main joining step, the rotating speed of the rotating tool F may be constant, but may be varied. In the press-in section of the main joining process, if the rotational speed of the rotating tool F at the start position SP1 is V1, and the rotational speed of the rotating tool F between the intermediate points S1 and S2 is V2, then V1
>V2. The rotation speed V2 is a preset constant rotation speed on the set movement route L1. In other words, at the start position SP1, the rotation speed may be set high, and the rotation speed may be gradually reduced in the push-in interval to shift to the main interval.

Further, in the detachment section of the first main welding process, if the rotational speed of the rotating tool F between the intermediate points S1 and S2 is V2, and the rotational speed of the rotating tool F when detached at the end position EP1 is V3, then V3>V2. may be That is, after shifting to the detachment section, the rotating tool F may be detached from the sealing body 3 while gradually increasing the number of revolutions toward the end position EP1. When the rotating tool F is pushed into the sealing body 3 or separated from the sealing body 3, by setting as described above, the small pressing force in the pushing section or the separating section can be compensated for by the rotation speed. Therefore, friction stirring can be performed favorably.

[Second embodiment]
Next, a method for manufacturing the liquid cooling jacket according to the second embodiment of the present invention will be described. In the second embodiment, as shown in FIG. 15, the positions of the start position SP2 and the end position EP2 in the main bonding step are different from those in the first embodiment. In the second embodiment, the description will focus on the parts that are different from the first embodiment.

In manufacturing the liquid cooling jacket according to the second embodiment, a preparation process, a placement process, and a main bonding process are performed. The preparation process and the placement process are the same as in the first embodiment.

As shown in FIG. 15, in the main joining step of the present embodiment, the start position SP2 is set on the set movement route L1, and the end position EP2 is set on the set movement route L1.

In the main joining step, there is a push-in section from the start position SP2 to the intermediate point S1, a main section from the intermediate point S1 to the intermediate point S2 on the set movement route L1, and a separation from the intermediate point S2 to the end position EP2. Friction stir the three sections of the section in succession. The intermediate points S1 and S2 are set on the set movement route L1.

In the pressing section of the main joining step, as shown in FIG. 15, friction stir is performed from the start position SP2 to the intermediate point S1. In the push-in section, the tip side pin F3 rotated to the right is inserted into the start position SP2 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" at least until reaching the intermediate point S1.

When the intermediate point S1 is reached, the friction stir welding of this section is performed as it is. As shown in FIGS. 15 and 16, in this section, the rotating tool F is moved so that the center axis Z of rotation of the distal pin F3 and the set movement route L1 overlap. The offset amount between the distal pin F3 and the first inclined stepped side surface 12b, the offset amount between the proximal pin F2 and the second inclined stepped side surface 12c, and the insertion depth of the distal pin F3 are the same as in the first embodiment. .

When the tip side pin F3 reaches the intermediate point S2, the transition is made to the detachment section. In the detachment section, the tip side pin F3 is gradually pulled out (raised) from the sealing body 3 from the intermediate point S2 to the end position EP2, and is moved to the end position EP2 set on the set movement route L1. The tip side pin F3 is separated from the sealing body 3.

The method of manufacturing the liquid cooling jacket according to the second embodiment described above can also produce substantially the same effects as those of the first embodiment. Furthermore, in the pushing-in section of the main joining step according to the second embodiment, while moving the rotating tool F on the set movement route L1, the distal end side pin is gradually pushed in until reaching a predetermined depth, thereby moving the set movement route L1. It is possible to prevent the rotary tool F from stopping at one point above and causing excessive frictional heat.

[Third Embodiment]
Next, a method for manufacturing the liquid cooling jacket according to the third embodiment of the present invention will be described. In the third embodiment, as shown in FIGS. 16 and 17, the friction stir welding is performed by tilting the rotary tool F, which is different from the above-described embodiments. In this embodiment, differences from the first embodiment will be mainly described.

In this embodiment, the first slanted stepped side surface 12b1 and the second slanted stepped side surface 12c1 of the jacket body 2 are inclined outward more than in the first embodiment. That is, the inclination angle β1 of the first inclined stepped side surface 12b1 is larger than the inclination angle β of the first inclined stepped side surface 12b of the first embodiment, and the inclination angle β′1 of the second inclined stepped side surface 12c1 is the same as that of the first inclined stepped side surface 12c1 of the first embodiment. is larger than the inclination angle β' of the second inclined stepped side surface 12c. The intersection angle between the first inclined stepped side surface 12b1 and the second inclined stepped side surface 12c1 is the same as in the first embodiment, and is the angle between the outer peripheral surface of the distal side pin F3 of the rotating tool F and the outer peripheral surface of the proximal side pin F2. Equivalent to the intersection angle.

As shown in FIG. 18, in the main joining step, the rotation center axis j of the rotary tool F is inclined with respect to the vertical plane toward the outer peripheral portion of the jacket body 2 by an inclination angle γ, so that the tip end side pin F3 is attached to the sealing body. Friction stirring is performed in a state of contact with 3. The inclination angle γ for inclining the rotation center axis j of the rotating tool F with respect to the vertical plane is the first inclination of the jacket body 2 from the inclination angle α formed by the outer peripheral surface of the distal end pin F3 and the rotation center axis j. It is the same as the value obtained by subtracting the inclination angle β1 (see FIG. 17) of the stepped side surface 12b1 (γ=α−β1), and the inclination angle formed between the outer peripheral surface of the proximal pin F2 and the rotation center axis j. It is the same as the value obtained by subtracting the inclination angle β'1 (see FIG. 17) of the second inclined step side surface 12c1 of the jacket body 2 from α' (γ=α'-β'1). Since the value of γ in this case is a negative value, the rotation center axis j is inclined toward the outer peripheral portion of the jacket body 2 . The first inclined stepped side surface 12b1 and the outer peripheral surface of the tip side pin F3 facing the first inclined stepped side surface 12b1 are parallel to each other. In addition, the second inclined stepped side surface 12c1 and the outer peripheral surface of the base end pin F2 facing the second inclined stepped side surface 12c1 are parallel to each other.

That is, the direction in which the rotation center axis j of the rotating tool F is tilted is determined by the relationship between the tilt angles α, β1, α', and β'1. For example, when "α>β1, α'>β'1", the inclination angle γ takes a positive value, and the rotation center axis j of the rotating tool F is inclined toward the sealing body 3 side. In the case of "α<β1, α'<β'1", the inclination angle γ takes a negative value, and the rotation center axis j of the rotating tool F is inclined toward the outer peripheral portion of the jacket body 2. In addition, when "α=β1, α'=β'1", the tilt angle γ is "0 (zero)", and the rotational center axis j of the rotating tool F is parallel to the vertical plane without being tilted.
Other steps are the same as those in the first embodiment, so description thereof is omitted.

The method of manufacturing the liquid cooling jacket according to the third embodiment described above can also produce substantially the same effects as those of the first embodiment. Further, in the present embodiment, the inclination angle γ with respect to the vertical plane of the rotation center axis j of the rotary tool F is calculated from the inclination angle α of the outer peripheral surface of the distal pin F3 with respect to the rotation center axis j to the vertical plane of the first inclined stepped side surface 12b1. and the inclination angle β'1 of the second inclined stepped side surface 12c1 with respect to the vertical plane is subtracted from the inclination angle α' of the outer peripheral surface of the proximal pin F2 with respect to the rotation center axis j. By matching the values, the following effects can be obtained. That is, optimum values can be selected for the tilt angles α, β1, α', and β'1. In addition, the outer peripheral surface of the tip-side pin F3 and the first inclined stepped side surface 12b1 are made parallel to avoid contact between the outer peripheral surface of the tip-side pin F3 and the first inclined stepped side surface 12b1. and the first inclined stepped side surface 12b1 can be brought as close as possible in the height direction. Further, the outer peripheral surface of the proximal pin F2 and the second inclined stepped side surface 12c1 are made parallel to avoid contact between the outer peripheral surface of the proximal pin F2 and the second inclined stepped side surface 12c1. and the second inclined stepped side surface 12c1 can be brought as close as possible over the height direction. Furthermore, the contact margin between the outer peripheral surface of the distal pin F3 and the first inclined stepped side surface 12b1 can be made uniform over the height direction, and the contact between the outer peripheral surface of the proximal pin F2 and the second inclined stepped side surface 12c1 can be achieved. The margin can be made uniform over the height direction. As a result, in the present embodiment, the plastic flow material is stirred in a well-balanced manner, thereby suppressing a decrease in the strength of the joint.

Furthermore, the inclination angles α and α' are determined by the design concept of the rotary tool in the technical field of friction stir welding (FSW), and the inclination angles β1 and β'1 are determined by the casting field (for example, die casting). Determined by the design concept of the mold. In other words, since the inclination angles α, α', β1, and β'1 all have optimum values depending on the design concept, it may be difficult to set "α=β1, α'=β'1". However, according to the present embodiment, since the inclination angles α, α', β1, β'1 can be freely selected, optimum values can be selected as the inclination angles α and β.

Although the embodiments of the present invention have been described above, design changes can be made as appropriate without departing from the gist of the present invention. In the above embodiment, the distal pin F3 is brought into slight contact with both the first inclined stepped side surface 12b and the stepped bottom surface 12a, and the proximal pin F2 is brought into slight contact with the second inclined stepped side surface 12c. Stir welding is performed, but it is not limited to this. The proximal pin F2 does not necessarily have to be in contact with the second inclined stepped side surface 12c.

In the above-described embodiment, the surface 3a of the sealing body 3 is located above the surface 11a of the peripheral wall portion 11 of the jacket body 2, but the present invention is not limited to this. The surface 3a of the sealing body 3 and the surface 11a of the peripheral wall portion 11 of the jacket body 2 may have the same height.

By the way, when friction heat is generated by friction stir welding, there is a possibility that the sealing body 3 may warp in a concave shape due to thermal contraction. Therefore, the sealing body 3 may be formed in advance so as to protrude toward the surface 3a. By configuring in this way, the liquid cooling jacket can be flattened using thermal contraction.

Moreover, a temporary bonding step of temporarily bonding the jacket main body 2 and the sealing body 3 may be performed before performing the main bonding step. As a result, opening between the jacket body 2 and the sealing body 3 can be prevented during the main joining process. The temporary joining step may be performed by friction stir using a rotating tool for temporary joining, or may be performed by welding.

Further, in the push-in section and the withdrawal section, the movement route may be set so that the movement locus of the rotating tool F draws a curved line (for example, an arc) in a plan view. As a result, it is possible to smoothly transition from the push-in section to the main section or from the main section to the detachment section.

1 liquid cooling jacket 2 jacket main body 3 sealing body 11 peripheral wall portion 12 peripheral wall step portion 12a step bottom surface 12b first inclined step side surface 12c second inclined step side surface 12b1 first inclined step side surface 12c1 second inclined step side surface F rotating tool F2 base End side pin F3 Tip side pin J1 First abutting part J2 Second abutting part L1 Set movement route S1 Intermediate point S2 Intermediate point SP1 Start position SP2 Start position EP1 End position EP2 End position W Plasticization region

Claims (10)

A liquid that is composed of a jacket body having a bottom portion and a peripheral wall portion that rises from the peripheral edge of the bottom portion, and a sealing body that seals an opening of the jacket body, and that joins the jacket body and the sealing body by friction stirring. A method for manufacturing a cold jacket, comprising:
the jacket main body is made of a first aluminum alloy, the sealing body is made of a second aluminum alloy, and the first aluminum alloy is a material having a hardness higher than that of the second aluminum alloy,
A rotary tool used in friction stir includes a proximal pin and a distal pin,
A taper angle of the proximal pin is larger than a taper angle of the distal pin, and a stepped portion is formed on an outer peripheral surface of the proximal pin,
At the inner peripheral edge of the peripheral wall portion, a stepped bottom surface, a first inclined stepped side surface rising from the stepped bottom surface so as to widen toward the opening, and an upper end of the first inclined stepped side surface extending toward the opening. and a second inclined stepped side surface that rises so as to widen further, and the plate thickness of the sealing body is the height dimension of the first inclined stepped side surface of the peripheral wall stepped portion. a preparatory step of forming to be larger than
By placing the sealing body on the jacket main body, the stepped side surface of the peripheral wall stepped portion and the outer peripheral side surface of the sealing body are butted to form a first abutting portion, and the stepped bottom surface of the peripheral wall stepped portion is formed. and a placing step of overlapping the back surface of the sealing body to form a second butting portion;
The distal pin of the rotary tool that rotates is inserted into the sealing body, and while the outer peripheral surface of the distal pin is slightly in contact with the first inclined stepped side surface of the peripheral wall stepped portion, the proximal pin is inserted. is in contact with the surface of the sealing body, along a set movement route set inside the outer peripheral side surface of the sealing body to a predetermined depth around the sealing body. and a main joining step of friction-stirring the first butt portion by allowing the
In the main welding step, the end position is set further inside the set movement route, and after the friction stir welding for the first butting portion, the tip side pin is moved to the end position while moving the rotating tool to the end position. A method of manufacturing a liquid cooling jacket, wherein the rotating tool is separated from the sealing body at the end position by gradually pulling out the sealing body. In the main joining step, the outer peripheral surface of the proximal pin is slightly in contact with the second inclined stepped side surface of the peripheral wall stepped portion, and the inclination angle of the rotation center axis of the rotary tool with respect to the vertical plane is set to γ, Let β be the inclination angle of the first inclined stepped side surface with respect to the vertical plane, β′ be the inclination angle of the second inclined stepped side surface with respect to the vertical plane, and α be the inclination angle of the outer peripheral surface of the tip side pin with respect to the rotation center axis. and the friction stir welding is performed in a state where γ=α−β and γ=α′−β′, where α′ is the inclination angle of the outer peripheral surface of the proximal side pin with respect to the rotation center axis. The manufacturing method of the liquid cooling jacket according to claim 1. 3. The liquid according to claim 1, wherein the predetermined depth of the main joining step is set at a position where the tip-side pin slightly contacts the bottom surface of the step of the stepped portion of the peripheral wall. A method for manufacturing a cold jacket. In the main welding step, the tip side pin is rotated at a predetermined rotational speed to perform friction stir,
4. The pin as set forth in any one of claims 1 to 3, wherein when the pin on the tip side is detached in the main joining step, the pin is moved to the end position while gradually increasing the rotation speed from the predetermined rotation speed. A method for manufacturing the liquid cooling jacket according to claim 1. A liquid that is composed of a jacket body having a bottom portion and a peripheral wall portion that rises from the peripheral edge of the bottom portion, and a sealing body that seals an opening of the jacket body, and that joins the jacket body and the sealing body by friction stirring. A method for manufacturing a cold jacket, comprising:
the jacket main body is made of a first aluminum alloy, the sealing body is made of a second aluminum alloy, and the first aluminum alloy is a material having a hardness higher than that of the second aluminum alloy,
A rotary tool used in friction stir includes a proximal pin and a distal pin,
A taper angle of the proximal pin is larger than a taper angle of the distal pin, and a stepped portion is formed on an outer peripheral surface of the proximal pin,
At the inner peripheral edge of the peripheral wall portion, a stepped bottom surface, a first inclined stepped side surface rising from the stepped bottom surface so as to widen toward the opening, and an upper end of the first inclined stepped side surface extending toward the opening. and a second inclined stepped side surface that rises so as to widen further, and the plate thickness of the sealing body is the height dimension of the first inclined stepped side surface of the peripheral wall stepped portion. a preparatory step of forming to be larger than
By placing the sealing body on the jacket main body, the stepped side surface of the peripheral wall stepped portion and the outer peripheral side surface of the sealing body are butted to form a first abutting portion, and the stepped bottom surface of the peripheral wall stepped portion is formed. and a placing step of overlapping the back surface of the sealing body to form a second butting portion;
The distal pin of the rotary tool that rotates is inserted into the sealing body, and while the outer peripheral surface of the distal pin is slightly in contact with the first inclined stepped side surface of the peripheral wall stepped portion, the proximal pin is inserted. is in contact with the surface of the sealing body, along a set movement route set inside the outer peripheral side surface of the sealing body to a predetermined depth around the sealing body. and a main joining step of friction-stirring the first butt portion by allowing the
In the main welding step, an end position is set on the set movement route, and after friction stir welding to the first butt portion, the tip side pin is moved to the sealing body while moving the rotating tool to the end position. A method for manufacturing a liquid cooling jacket, characterized in that the rotating tool is separated from the sealing body at the end position by gradually pulling it out from the sealing body. In the main joining step, the outer peripheral surface of the proximal pin is slightly in contact with the second inclined stepped side surface of the peripheral wall stepped portion, and the inclination angle of the rotation center axis of the rotary tool with respect to the vertical plane is set to γ, Let β be the inclination angle of the first inclined stepped side surface with respect to the vertical plane, β′ be the inclination angle of the second inclined stepped side surface with respect to the vertical plane, and α be the inclination angle of the outer peripheral surface of the tip side pin with respect to the rotation center axis. and the friction stir welding is performed in a state where γ=α−β and γ=α′−β′, where α′ is the inclination angle of the outer peripheral surface of the proximal side pin with respect to the rotation center axis. The manufacturing method of the liquid cooling jacket according to claim 5. 7. The liquid according to claim 5, wherein the predetermined depth of the main joining step is set at a position where the tip side pin slightly contacts the bottom surface of the step of the stepped portion of the peripheral wall. A method for manufacturing a cold jacket. In the main welding step, the tip side pin is rotated at a predetermined rotational speed to perform friction stir,
8. The pin as set forth in any one of claims 5 to 7, characterized in that, when the pin on the tip side is detached in the main joining step, the pin is moved to the end position while gradually increasing the rotation speed from the predetermined rotation speed. A method for manufacturing the liquid cooling jacket according to claim 1. 9. The preparation step according to any one of claims 1 to 8, wherein the jacket body is formed by die casting and at least the sealing body is formed so as to protrude on the surface side. manufacturing method of the liquid cooling jacket. 10. The method of manufacturing a liquid cooling jacket according to any one of claims 1 to 9, further comprising a temporary joining step of temporarily joining the first abutting portion prior to the main joining step.

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