JP7327238B2 - Liquid cooling jacket manufacturing method - Google Patents

Description

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

A method of manufacturing a liquid cooling jacket using friction stir welding has been carried out. For example, Patent Literature 1 discloses a method of manufacturing a liquid cooling jacket. FIG. 17 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 FD2 of the rotating tool FD into the butted portion J10. Further, in the conventional method of manufacturing a liquid cooling jacket, the rotation center axis XA of the rotary tool FD is superimposed on the butted portion J10 and relatively moved.

JP 2015-131321 A

Here, the jacket body 101 is likely 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 FD2 of the rotating tool FD 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.

Further, after the liquid cooling jacket is completed, there are cases where quality control of the liquid cooling jacket is performed, for example, by performing an ultrasonic inspection. At this time, although it is possible to grasp the presence or absence of joint failure by ultrasonic flaw detection, there is a problem that it is not possible to grasp which position the rotating tool has passed.

Moreover, since the stirring pin FD2 is moved in the vertical direction when the stirring pin FD2 is separated from the abutting portion J10, the frictional heat at the start position of the friction stirring 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.

Moreover, since the stirring pin FD2 is moved in the vertical direction when the stirring pin FD2 is separated from the abutting portion J10, the frictional heat at the end position of the friction stirring becomes excessive. As a result, the metal on the side of the jacket main body 101 is likely to be mixed into the side of the sealing body 102 at the end position, which causes a problem of connection failure.

From such a 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 aluminum alloys of different grades and can grasp the passage position of a rotating tool. do.

In order to solve such problems, the present invention provides a liquid for friction stir welding of a jacket body having a bottom, a peripheral wall rising from the peripheral edge of the bottom, and a sealing body for sealing an opening of the jacket body. In the cold jacket manufacturing method, the jacket main body is made of a material having a hardness higher than that of the sealing body, and the rotary tool used for friction stir includes a proximal side pin and a distal side pin. The taper angle of the side pin is larger than the taper angle of the tip side pin, and a stepped pin step portion is formed on the outer peripheral surface of the proximal side pin, and the outer peripheral surface of the tip side pin. is inclined so as to be tapered, and the tip side pin has a flat surface perpendicular to the rotation center axis of the rotary tool at its tip, and has a protrusion projecting from the flat surface, and the peripheral wall portion a preparation step of forming a peripheral wall stepped portion having a stepped bottom surface and a stepped side surface rising from the stepped bottom surface toward the opening on the inner peripheral edge of the jacket 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 butting portion, and the stepped bottom surface and the back side of the sealing body are overlapped to form a second butting portion. and, while the flat surface of the tip side pin of the rotating rotating tool is brought into contact only with the sealing body, the tip surface of the protrusion is moved to the same depth as or slightly deeper than the bottom surface of the step. The first pin is inserted deeply, and the outer peripheral surface of the proximal pin is brought into contact with the surface of the sealing body, while the outer peripheral surface of the distal pin is slightly brought into contact with at least the upper side of the jacket body. Friction stirring is performed by rotating a rotating tool along a set movement route set closer to the sealing body than the abutting portion, while forming a coarse and dense portion having a predetermined width in a portion adjacent to the stepped side surface in the plasticized region. and a main joining step, wherein in the main joining step, after inserting the rotating tip side pin into a start position set further inside the set movement route, the rotation center axis of the rotating tool is moved to the set movement. The tip side pin is gradually pushed in until reaching a predetermined depth while being moved to a position overlapping the root.

According to this manufacturing method, the metal 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 pin on the distal end side, and the stepped side surface and the sealing body are formed at the first abutting portion. The outer peripheral side surface can be joined. In addition, while the outer peripheral surface of the proximal pin is in contact with the surface of the sealing body, the distal pin is brought into slight contact with at least the upper side of the stepped side surface of the jacket body to perform friction stir, thereby ensuring the bonding strength. It is possible to minimize the mixing of metal from the jacket main body into the sealing body. As a result, mainly the metal on the side of the sealing body is friction-stirred at the first abutting portion, so that a decrease in bonding strength can be suppressed. In addition, by moving the rotating tool to a position that overlaps with the set movement route and gradually pushing the distal end pin until a predetermined depth is reached, it is possible to prevent frictional heat from becoming excessive on the set movement route. .

Further, by deliberately forming the sparse and dense portions with a predetermined width, it is possible to grasp the passage position of the tip side pin by flaw detection inspection. Thereby, quality control work can be performed more easily. Further, by forming the outer peripheral surface and the stepped side surface of the tip side pin to be inclined, it is possible to avoid large contact between the tip side pin and the stepped side surface. In addition, since the plastic flow material wound up around the protrusion is pressed by the flat surface, the oxide film of the second abutting portion can be reliably divided. Thereby, the joint strength of the second butted portion can be increased.

Further, the present invention is a method for manufacturing a liquid cooling jacket by friction stir welding a jacket main body having a bottom portion, a peripheral wall portion rising from the peripheral edge of the bottom portion, and a sealing body for sealing an opening of the jacket main body. The jacket body is made of a material having hardness higher than that of the sealing body, and the rotary tool used for friction stir includes a proximal side pin and a distal side pin, and the proximal side pin has a taper angle of The taper angle of the distal side pin is larger than that of the distal side pin, and a stepped pin stepped portion is formed on the outer peripheral surface of the proximal side pin, and the outer peripheral surface of the distal side pin is inclined to be tapered. The tip side pin has a flat surface perpendicular to the rotation center axis of the rotating tool at its tip, and has a protrusion projecting from the flat surface. and a stepped side surface that rises from the stepped bottom surface toward the opening; and a stepped side surface of the peripheral wall stepped portion by placing the sealing body on the jacket body. a mounting step of forming a first abutment portion by abutting the outer peripheral side surface of the sealing body, and forming a second abutting portion by overlapping the bottom surface of the step and the back surface of the sealing body; While the flat surface of the distal pin of the rotating tool is in contact only with the sealing body, the distal end surface of the protrusion is inserted to the same depth as or slightly deeper than the bottom surface of the step, and the proximal end is inserted. While the outer peripheral surface of the side pin is in contact with the surface of the sealing body, the outer peripheral surface of the tip side pin is slightly in contact with at least the upper side of the jacket body, and the sealing is performed from the first abutment portion. a final joining step of forming a coarse and dense portion with a predetermined width in a portion adjacent to the stepped side surface in the plasticized region while rotating the rotating tool around along a set movement route set on the body side to friction stir. , in the main joining step, the tip side pin is inserted from the start position set on the set moving route, and the tip side pin is gradually pushed in until reaching a predetermined depth while moving in the advancing direction. and

According to this manufacturing method, the metal 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 pin on the distal end side, and the stepped side surface and the sealing body are formed at the first abutting portion. The outer peripheral side surface can be joined. In addition, while the outer peripheral surface of the proximal pin is in contact with the surface of the sealing body, the distal pin is brought into slight contact with at least the upper side of the stepped side surface of the jacket body to perform friction stir, thereby ensuring the bonding strength. It is possible to minimize the mixing of metal from the jacket main body into the sealing body. As a result, mainly the metal on the side of the sealing body is friction-stirred at the first abutting portion, so that a decrease in bonding strength can be suppressed. In addition, while moving the rotary tool along the set movement route, the tip side pin is gradually pushed in until reaching a predetermined depth, thereby preventing excessive frictional heat at one point on the set movement route. .

Further, by deliberately forming the sparse and dense portions with a predetermined width, it is possible to grasp the passage position of the tip side pin by flaw detection inspection. Thereby, quality control work can be performed more easily. Further, by forming the outer peripheral surface and the stepped side surface of the tip side pin to be inclined, it is possible to avoid large contact between the tip side pin and the stepped side surface. In addition, since the plastic flow material wound up around the protrusion is pressed by the flat surface, the oxide film of the second abutting portion can be reliably divided. Thereby, the joint strength of the second butted portion can be increased.

Further, in the present invention, in the main welding step, the rotating tool is rotated at a predetermined rotational speed to perform friction stir, and when inserting the tip side pin in the main welding step, the rotational speed is faster than the predetermined rotational speed. It is preferable to insert the distal pin while rotating it at a high speed and move it to the set movement route while gradually decreasing the rotational speed.

According to such a joining method, friction stir can be performed more suitably.

Further, the present invention is a method for manufacturing a liquid cooling jacket by friction stir welding a jacket main body having a bottom portion, a peripheral wall portion rising from the peripheral edge of the bottom portion, and a sealing body for sealing an opening of the jacket main body. The jacket body is made of a material having hardness higher than that of the sealing body, and the rotary tool used for friction stir includes a proximal side pin and a distal side pin, and the proximal side pin has a taper angle of The taper angle of the distal side pin is larger than that of the distal side pin, and a stepped pin stepped portion is formed on the outer peripheral surface of the proximal side pin, and the outer peripheral surface of the distal side pin is inclined to be tapered. The tip side pin has a flat surface perpendicular to the rotation center axis of the rotating tool at its tip, and has a protrusion projecting from the flat surface. and a stepped side surface that rises from the stepped bottom surface toward the opening; and a stepped side surface of the peripheral wall stepped portion by placing the sealing body on the jacket body. a mounting step of forming a first abutment portion by abutting the outer peripheral side surface of the sealing body, and forming a second abutting portion by overlapping the bottom surface of the step and the back surface of the sealing body; While the flat surface of the distal pin of the rotating tool is in contact only with the sealing body, the distal end surface of the protrusion is inserted to the same depth as or slightly deeper than the bottom surface of the step, and the proximal end is inserted. While the outer peripheral surface of the side pin is in contact with the surface of the sealing body, the outer peripheral surface of the tip side pin is slightly in contact with at least the upper side of the jacket body, and the sealing is performed from the first abutment portion. a final joining step of forming a coarse and dense portion with a predetermined width in a portion adjacent to the stepped side surface in the plasticized region while rotating the rotating tool around along a set movement route set on the body side to friction stir. , in the main welding step, the end position is set further inside the set moving route, and after friction stir welding for the first butted portion, the tip side pin is moved while moving the rotating tool to the end position The rotary tool is separated from the sealing body at the end position by gradually pulling out the sealing body.

According to this manufacturing method, the metal 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 pin on the distal end side, and the stepped side surface and the sealing body are formed at the first abutting portion. The outer peripheral side surface can be joined. In addition, while the outer peripheral surface of the proximal pin is in contact with the surface of the sealing body, the distal pin is brought into slight contact with at least the upper side of the stepped side surface of the jacket body to perform friction stir, thereby ensuring the bonding strength. It is possible to minimize the mixing of metal from the jacket main body into the sealing body. As a result, mainly the metal on the side of the sealing body is friction-stirred at the first abutting portion, so that a decrease in bonding strength can be suppressed. Further, by gradually withdrawing the tip-side pin while moving the rotary tool to the set end position inside the set movement route, it is possible to prevent frictional heat from becoming excessively large on the set movement route.

Further, by deliberately forming the sparse and dense portions with a predetermined width, it is possible to grasp the passage position of the tip side pin by flaw detection inspection. Thereby, quality control work can be performed more easily. Further, by forming the outer peripheral surface and the stepped side surface of the tip side pin to be inclined, it is possible to avoid large contact between the tip side pin and the stepped side surface. In addition, since the plastic flow material wound up around the protrusion is pressed by the flat surface, the oxide film of the second abutting portion can be reliably divided. Thereby, the joint strength of the second butted portion can be increased.

Further, the present invention is a method for manufacturing a liquid cooling jacket by friction stir welding a jacket main body having a bottom portion, a peripheral wall portion rising from the peripheral edge of the bottom portion, and a sealing body for sealing an opening of the jacket main body. The jacket body is made of a material having hardness higher than that of the sealing body, and the rotary tool used for friction stir includes a proximal side pin and a distal side pin, and the proximal side pin has a taper angle of The taper angle of the distal side pin is larger than that of the distal side pin, and a stepped pin stepped portion is formed on the outer peripheral surface of the proximal side pin, and the outer peripheral surface of the distal side pin is inclined to be tapered. The tip side pin has a flat surface perpendicular to the rotation center axis of the rotating tool at its tip, and has a protrusion projecting from the flat surface. and a stepped side surface that rises from the stepped bottom surface toward the opening; and a stepped side surface of the peripheral wall stepped portion by placing the sealing body on the jacket body. a mounting step of forming a first abutment portion by abutting the outer peripheral side surface of the sealing body, and forming a second abutting portion by overlapping the bottom surface of the step and the back surface of the sealing body; While the flat surface of the distal pin of the rotating tool is in contact only with the sealing body, the distal end surface of the protrusion is inserted to the same depth as or slightly deeper than the bottom surface of the step, and the proximal end is inserted. While the outer peripheral surface of the side pin is in contact with the surface of the sealing body, the outer peripheral surface of the tip side pin is slightly in contact with at least the upper side of the jacket body, and the sealing is performed from the first abutment portion. a final joining step of forming a coarse and dense portion with a predetermined width in a portion adjacent to the stepped side surface in the plasticized region while rotating the rotating tool around along a set movement route set on the body side to friction stir. , in the main welding step, an end position is set on the set movement route, and after friction stir welding to the first butting portion, the tip side pin is sealed while moving the rotating tool to the end position; It is characterized by gradually withdrawing from the body to disengage the rotary tool from the closure at the end position.

According to this manufacturing method, the metal 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 pin on the distal end side, and the stepped side surface and the sealing body are formed at the first abutting portion. The outer peripheral side surface can be joined. In addition, while the outer peripheral surface of the proximal pin is in contact with the surface of the sealing body, the distal pin is brought into slight contact with at least the upper side of the stepped side surface of the jacket body to perform friction stir, thereby ensuring the bonding strength. It is possible to minimize the mixing of metal from the jacket main body into the sealing body. As a result, mainly the metal on the side of the sealing body is friction-stirred at the first abutting portion, so that a decrease in bonding strength can be suppressed. Further, by gradually withdrawing the distal pin toward the end position 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.

Further, by deliberately forming the sparse and dense portions with a predetermined width, it is possible to grasp the passage position of the tip side pin by flaw detection inspection. Thereby, quality control work can be performed more easily. Further, by forming the outer peripheral surface and the stepped side surface of the tip side pin to be inclined, it is possible to avoid large contact between the tip side pin and the stepped side surface. In addition, since the plastic flow material wound up around the protrusion is pressed by the flat surface, the oxide film of the second abutting portion can be reliably divided. Thereby, the joint strength of the second butted portion can be increased.

In the main welding step, the rotating tool is rotated at a predetermined rotational speed to perform friction stir, and when the tip side pin is detached in the main welding step, the rotational speed is gradually increased from the predetermined rotational speed. It is preferable to move to the end position while moving.

According to such a joining method, friction stir can be performed more suitably.

According to the method for manufacturing a liquid cooling jacket according to the present invention, it is possible to grasp the passing position of the rotating tool while suitably joining metals of different materials.

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 rotation tool. It is a sectional view showing the third modification of a rotating tool. FIG. 4 is a perspective view showing a preparatory step of the manufacturing method of the liquid cooling jacket according to the first embodiment of the present invention; FIG. 5 is a cross-sectional view showing a placing step of the method for manufacturing the liquid cooling jacket according to the first embodiment; FIG. 4 is a perspective view showing a 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 after the main bonding step in the method for manufacturing the liquid cooling jacket according to the first embodiment; FIG. 4 is a plan view showing an inspection step of the method for manufacturing the liquid cooling jacket according to the first embodiment; It is a figure which shows the example which inserted the outer peripheral surface of the front-end|tip side pin in the position spaced apart from the step|step difference side surface. It is a figure which shows the example inserted in the position which made the outer peripheral surface of the front-end|tip side pin contact the side surface of a step|step largely. FIG. 10 is a plan view showing a main bonding step of the method for manufacturing the liquid cooling jacket according to the second embodiment of the present invention; 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 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. The present invention is not limited only to the following embodiments. Also, some or all of the components in each embodiment can be combined as appropriate. First, the rotating tool used in the manufacturing method of the liquid cooling jacket according to this embodiment will be described. A rotating 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 proximal pin F2, a distal pin F3, a flat surface F4, and a projection F5. is configured to 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 FIG. 2, a stepped pin stepped portion F21 is formed over the entire height direction on the outer peripheral surface of the base end side 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 projecting portion F5 is a portion projecting downward from the center of the flat surface F4. Although the shape of the protrusion F5 is not particularly limited, it is, for example, cylindrical. A stepped portion is formed by the side surface of the protrusion F5 and the flat surface F4.

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 step angle C and the height Y1 of the step side face 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 axis of the tool (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 stepped side surface F21b, the stepped angle C, and the angle of the stepped bottom surface F21a with respect to the horizontal plane are set so 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 tip of the tip side pin F3 forms a flat surface F4 perpendicular to the rotation axis. 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 axis of the tool toward the outer peripheral direction. The stepped side surface F21b is parallel to the vertical plane. In this manner, the stepped bottom surface F21a may be formed so as to be inclined upward from the horizontal surface toward the outer peripheral direction from the rotating shaft of the tool within a 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.

The rotating tool F is attached to the rotating shaft of the friction stirrer. Note that the rotary tool F may be attached to a robot arm having a rotary drive means such as a spindle unit at its tip. Thereby, the rotation center axis line X (see FIG. 9) of the rotating tool F can be freely inclined.

[First embodiment]
A method of manufacturing a liquid cooling jacket according to an embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIG. 6, the method for manufacturing the liquid cooling jacket 1 according to the embodiment of the present invention manufactures the liquid cooling jacket 1 by joining the jacket main body 2 and the sealing body 3 by friction stir welding. The liquid cooling jacket 1 is a member in which a heating element (not shown) is installed on the sealing body 3 and heat is exchanged with the heating element by flowing a fluid inside. In addition, the "front surface" in the following description means the surface on the opposite side of the "back surface".

The method for manufacturing a liquid cooling jacket according to this embodiment includes a preparation process, a placement process, a main bonding process, and an inspection process. The preparation step is a step of preparing the jacket body 2 and the sealing body 3 . The jacket body 2 is mainly composed of a bottom portion 10 and a peripheral wall portion 11 . The jacket body 2 is formed mainly containing 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. Although the jacket main body 2 is made of an aluminum alloy in this embodiment, other metals that can be friction-stirred may be used.

As shown in FIG. 6, the bottom portion 10 is a plate-like member having a rectangular shape in plan view. 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 peripheral wall stepped 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 rising from the step bottom surface 12a. As shown in FIG. 7, the stepped side surface 12b is inclined so as to expand outward from the stepped bottom surface 12a toward the opening. The inclination angle β of the stepped side surface 12b with respect to the vertical plane may be appropriately set, and is, for example, 3° to 30° with respect to the vertical plane. A concave portion 13 is formed by the bottom portion 10 and the peripheral wall portion 11 . Here, the vertical plane is defined as a plane composed of the moving direction vector of the rotary tool F and the vertical direction vector.

The sealing body 3 is a plate-like member that seals the opening of the jacket body 2 . The sealing body 3 is sized to be placed on the peripheral wall stepped portion 12 . The plate thickness of the sealing body 3 is larger than the height dimension of the stepped side surface 12b. The plate thickness dimension of the sealing body 3 is appropriately set to such an extent that the joint portion does not become short of metal during the main joint step described later. The sealing body 3 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. Although an aluminum alloy is exemplified for the sealing body 3 in this embodiment, other metals that can be friction-stirred may be used. In this specification, hardness refers to Brinell hardness, which can be measured by a method according to JIS Z 2243.

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 rear surface 3b of the sealing body 3 is mounted on the stepped bottom surface 12a. The stepped side surface 12b and the outer peripheral side surface 3c of the sealing body 3 are butted together to form a first butting portion J1. The first abutment part J1 may include a case where the parts are abutted with a gap having a substantially V-shaped cross section as in the present embodiment. Further, the stepped bottom surface 12a and the back surface 3b of the sealing body 3 are overlapped to form a second butted portion J2.

As shown in FIG. 8, a "set movement route L1" (chain line) is set inside the first matching portion J1. As will be described later, in the present embodiment, the set movement route L1 is such that the upper side of the outer peripheral surface of the distal pin F3 is slightly in contact with the upper portion of the stepped side surface 12b of the peripheral wall stepped portion 12, and the lower side of the outer peripheral surface In order to avoid contact with the stepped side surface 12b of the portion 12, the set movement route L1 is set to have a rectangular shape in plan view inside the outer peripheral surface of the sealing body 3. As shown in FIG.

In the main joining step, the push-in section, the main section, and the detachment section are continuously friction-stirred. In the pressing section of the main joining step, as shown in FIG. 8, friction stir is performed from a start position SP1 set on the surface 3a of the sealing body 3 to an intermediate point S1 set on the set movement route L1. In the push-in section, the rotary tool F is arranged so that the center axis X of rotation of the rotary tool F is perpendicular to the start position SP1, and the distal pin F3 is gradually pushed in until it reaches a predetermined depth while relatively moving toward the intermediate point S1. To go.

At this time, as shown in FIG. 9, 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 rotating tool F reaches the intermediate point S1, the process proceeds directly to the main section. A plasticized region W1 is formed in the movement locus of the rotating tool F. As shown in FIG.

It should be noted that the predetermined depth is the main section from the intermediate point S1 on the set travel route L1 to the intermediate point S2 set on the set travel route L1 after passing the intermediate point S1 by going around the set travel route L1. , refers to the depth into which the tip side pin F3 is inserted. In this embodiment, the outer peripheral surface of the proximal pin F2 is brought into contact with the surface 3a of the sealing member 3, and the flat surface F4 of the distal pin F3 is brought into contact only with the sealing member 3, while the tip of the protrusion F5 is The surface is inserted so as to be slightly deeper than the stepped bottom surface 12a of the peripheral wall stepped portion 12. - 特許庁It should be noted that even if the flat surface F4 of the pin F3 on the tip side is brought into contact only with the sealing body 3, the tip surface of the protrusion F5 may be inserted so as to be at the same height as the bottom surface 12a of the stepped portion 12 of the peripheral wall. good.

In this section, as shown in FIG. 9, friction stir is performed in a state in which the rotation center axis X of the rotating tool F is parallel to the vertical line (vertical plane). With the distal pin F3 maintained at a predetermined depth, the rotary tool F is moved so that the rotation center axis X and the set movement route L1 overlap. The inclination angle β (see FIG. 7) of the stepped side surface 12b is set smaller than the inclination angle α of the outer peripheral surface of the distal pin F3. In this step, the outer peripheral surface of the proximal side pin F2 is brought into contact with the surface 3a of the sealing body 3, and the upper side of the outer peripheral surface of the distal side pin F3 is slightly brought into contact with the upper portion of the stepped side surface 12b of the peripheral wall stepped portion 12. , the lower side of the outer peripheral surface of the tip side pin F3 is set so as not to contact the stepped side surface 12b of the peripheral wall stepped portion 12. As shown in FIG.

As shown in FIG. 10, in this section, after rotating the rotating tool F once around the sealing body 3, the start and end of the plasticized region W1 on the set movement route L1 are overlapped, and the tip pin F3 is placed in the middle. When the point S2 is reached, the process proceeds to the detachment step.

In the detachment section, the distal pin F3 is gradually moved upward from the intermediate point S2 to the end position EP1, and is detached from the sealing body 3 at the end position EP1. In other words, the rotating tool F is gradually pulled out while being moved to the end position EP1 without remaining in one place.

As shown in FIG. 11, when the main bonding step is performed, a plasticized region W1 is formed in the movement locus of the rotary tool F, and a coarse-dense portion Z is formed near the inner side of the stepped side surface 12b in the lower part of the plasticized region W1. It is formed. The sparse/dense portion Z is an area in which the plastic flow material is insufficiently agitated, and the plastic flow material is more densely packed than other parts. The coarse and dense portions Z are formed continuously or intermittently in the longitudinal direction of the plasticized region W1.

The inspection step is, as shown in FIG. 12, a step of performing a flaw detection inspection of the liquid cooling jacket 1 . In the inspection process, an ultrasonic testing device (for example, an ultrasonic imaging device (SAT) manufactured by Hitachi High-Technologies Corporation) is used. In the inspection result screen R in FIG. 11, the hollow portion U of the liquid cooling jacket 1 is displayed in color. In addition, the sparse/dense portion Z is colored around the hollow portion U and displayed in a frame-like and linear shape. That is, by displaying the sparse/dense portion Z on the inspection result screen R, it can be identified that the rotating tool F has passed over the entire circumference of the sealing body 3 . A portion between the hollow portion U and the coarse/dense portion Z corresponds to the plasticized region W1.

Here, the width Zw of the sparse and dense portion Z is preferably set to 400 μm or less, preferably 300 μm or less, more preferably 200 μm or less. If the width Zw of the coarse and dense portion Z exceeds 400 μm, the bonding strength of the first butted portion J1 may become insufficient. In other words, if the width Zw of the coarse and dense portion Z is 400 μm or less, a sufficient bonding strength can be obtained. On the other hand, the width Zw of the sparse and dense portion Z is preferably 100 μm or more. If the width Zw of the sparse and dense portion Z is less than 100 μm, there is a possibility that the sparse and dense portion Z may not be displayed on the inspection result screen R in the ultrasonic flaw detector.

As shown in FIG. 9, in this bonding step, the ratio of the area where the outer peripheral surface of the tip pin F3 and the stepped side surface 12b contact and the area where they do not contact is about 2:8 in this embodiment. However, it may be appropriately set within a range in which the jacket body 2 and the sealing body 3 are joined with a desired strength and the sparse and dense portion Z having the predetermined width is formed. In other words, the inclination angle .alpha. and the sealing body 3 are joined with a desired strength, and the above-described sparse and dense portion Z having a predetermined width may be formed as appropriate.

As shown in FIG. 13, if the outer peripheral surface of the tip side pin F3 and the stepped side surface 12b are spaced apart from each other, there is a possibility that they cannot be joined or the joining strength may be lowered. It is preferred to bring F3 into contact. Further, as shown in FIG. 14, when the contact margin between the tip pin F3 and the stepped side surface 12b increases, a large amount of the metal of the jacket main body 2, which has high hardness, flows into the sealing body 3, which has low hardness. 2 and the sealing body 3 may become unbalanced in agitation, and the bonding strength may decrease. Also, in the vicinity of the stepped bottom surface 12a, if the outer peripheral surface of the tip pin F3 and the stepped side surface 12b are too close to each other, or if they are too far apart from each other, it will be difficult to form the sparse and dense portion Z having the predetermined width. .

According to the method of manufacturing the liquid cooling jacket according to the present embodiment described above, the metal of the first abutting portion J1 mainly on the side of the sealing body 3 is agitated by frictional heat between the sealing body 3 and the tip end pin F3. The 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 by being plastically fluidized. In addition, since friction stir is performed by bringing the outer peripheral surface of the base end pin F2 into contact with the surface 3a of the sealing body 3 and causing the tip end pin F3 to slightly contact at least the upper side of the stepped side surface 12b of the jacket body 2, welding is performed. It is possible to minimize the mixing of metal from the jacket main body 2 into the sealing body 3 while ensuring the strength. As a result, mainly the metal on the side of the sealing body 3 is friction-stirred at the first abutting portion J1, so that a decrease in bonding strength can be suppressed.

In addition, since the tip surface of the protrusion F5 is inserted flush with or slightly deeper than the stepped bottom surface 12a, the joint strength at the second abutting portion J2 is increased, and metal from the jacket main body 2 to the sealing body 3 is prevented from entering the sealing body 3. can be minimized. Further, by deliberately forming the sparse and dense portion Z with a predetermined width, it is possible to grasp the passing position of the tip side pin F3 by flaw detection inspection. Thereby, quality control work can be performed more easily. Also, by making the thickness of the sealing body 3 larger than the stepped side surface 12b, it is possible to prevent metal shortage at the joint.

Further, the distal pin F3 is formed with a protrusion F5 that protrudes from the flat surface F4. That is, a stepped portion is formed by the flat surface F4 of the distal pin F3 and the protrusion F5. Therefore, the plastic flow material wound up around the protrusion F5 is held down by the flat surface F4, so that the oxide film of the second butted portion J2 can be reliably divided. Thereby, the joint strength of the second butted portion J2 can be increased.

In addition, by bringing the outer peripheral surface of the base end pin F2 into contact with the surface 3a of the sealing body 3 to hold down the plastic flow material, it is possible to suppress the occurrence of burrs. 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.

Further, by forming the outer peripheral surface of the tip side pin F3 and the stepped side surface 12b to be inclined, it is possible to avoid large contact between the tip side pin F3 and the stepped side surface 12b.

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 movement of the rotary tool F from stopping on the route L1 and the frictional heat from becoming excessively large. 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 pulled out from a predetermined depth to be detached. Frictional heat can be prevented from becoming excessive due to the stop of the movement of the rotary tool F above.

As a result, it is possible to prevent the second aluminum alloy from being excessively mixed into the jacket body 2 from the sealing body 3 and resulting in a defective joint due to excessive frictional heat on the set movement route L1.

In addition, in the main joining step, the positions of the start position SP1 and the end position EP1 may be appropriately set, but the angle formed between the start position SP1 and the set movement route L1 and the angle formed between the end position EP1 and the set movement route L1 are By setting the obtuse angle, the movement speed of the rotating tool F does not decrease at the intermediate points S1 and S2, and the transition to the main section or the detachment section can be performed smoothly. 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. Note that the rotary tool F may be moved from the start position SP1 to the set movement route L1 so that the trajectory of the rotary tool F draws a curve when viewed from above. Similarly, the rotary tool F may be moved from the set movement route L1 to the end position EP1 so that the trajectory of the rotary tool F draws a curve when viewed from above. A curve may be, for example, an arc-shaped locus.

Further, in the main joining step, the rotating direction and advancing direction of the rotary 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. As a result, 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. 3c can be joined more reliably.

In addition, 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 becomes a value obtained by adding the magnitude of the tangential velocity at the outer circumference of the rotating tool and the magnitude of 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 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 enhanced.

For example, in the present embodiment, the plate thickness of the sealing body 3 is made larger than the height dimension of the stepped side surface 12b, but both may be made the same. Alternatively, the stepped side surface 12b may be perpendicular to the stepped bottom surface 12a without being inclined.

[Second embodiment]
Next, a method for manufacturing the liquid cooling jacket according to the second embodiment of the present invention will be described. As shown in FIGS. 15 and 16, the second embodiment differs from the first embodiment in the positions of the start position SP2 and the end position EP2 in the main bonding step. In the second embodiment, the description will focus on the parts that are different from the first embodiment.

In the method for manufacturing a liquid cooling jacket according to the second embodiment, a preparation process, a placement process, a main bonding process, and an inspection process are performed. The preparation process, placement process and inspection 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 upstream of the intermediate point S1 on the set movement route L1. Also, the end position EP2 is set downstream of the intermediate point S2 on the set travel route L1.

In the main joining process, there is a push-in section from the starting position SP2 to the intermediate point S1, a main section from the intermediate point S1 to the intermediate point S2 around 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.

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 FIG. 16, in this section, the rotating tool F is moved so that the center axis of rotation (not shown) of the distal pin F3 and the set movement route L1 overlap. The contact margin between the tip side pin F3 and the stepped side surface 12b and the insertion depth of the tip side 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 moved upward from the intermediate point S2 to the end position EP2, and the end side pin F3 is moved from the sealing body 3 to the tip side at the end position EP2 set on the set movement route L1. Release pin F3.

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 F3 is gradually pushed in until reaching a predetermined depth, whereby the set movement route It is possible to prevent the rotary tool F from stopping at one point on L1 and causing excessive frictional heat. Further, in the detachment section of the main joining process according to the second embodiment, by moving the rotating tool F along the set movement route L1 and gradually detaching the distal end side pin F3, it rotates at one point on the set movement route L1. It is possible to prevent the tool F from stopping and the frictional heat from becoming excessive. As in the second embodiment, the start position SP2 and the end position EP2 in the main joining step may be set on the set movement route L1.

REFERENCE SIGNS LIST 1 liquid cooling jacket 2 jacket main body 3 sealing body F rotating tool F1 base shaft portion F2 base end pin F3 tip end pin F4 flat surface F5 protrusion J1 first butt portion J2 second butt portion W1 plasticized region Z coarse and dense portion

Claims (8)

A method for manufacturing a liquid cooling jacket by friction stir welding a jacket body having a bottom portion, a peripheral wall portion rising from the peripheral edge of the bottom portion, and a sealing body for sealing an opening of the jacket body, the method comprising:
The jacket body is made of a material having a hardness higher than that of the sealing body,
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 pin step portion is formed on an outer peripheral surface of the proximal pin,
The outer peripheral surface of the tip-side pin is tapered, and the tip-side pin has a flat surface perpendicular to the rotation center axis of the rotary tool at its tip, and a projection protruding from the flat surface. having a department,
a preparation step of forming a peripheral wall stepped portion having a stepped bottom surface and a stepped side surface rising from the stepped bottom surface toward the opening at the inner peripheral edge of the peripheral wall portion;
The sealing body is placed on the jacket main body, and 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 and the sealing body are formed. a placing step of overlapping the back surface to form a second butted portion;
inserting the tip surface of the protrusion to the same depth as or slightly deeper than the bottom surface of the step while bringing the flat surface of the tip-side pin of the rotating tool into contact only with the sealing body; While the outer peripheral surface of the proximal side pin is in contact with the surface of the sealing body, the outer peripheral surface of the distal side pin is slightly in contact with at least the upper side of the jacket main body. A main joining step of forming a coarse and dense portion of a predetermined width in a portion adjacent to the stepped side surface in the plasticized region while performing friction stir by rotating the rotating tool along a set movement route set on the sealing body side. , including
In the main joining step, after inserting the rotating tip side pin into a set start position further inside the set movement route, the rotation center axis of the rotating tool is moved to a position overlapping with the set movement route. A method for manufacturing a liquid cooling jacket, characterized in that the tip pin is gradually pushed in until a predetermined depth is reached. In the main welding step, friction stir is performed by rotating the rotating tool at a predetermined rotational speed,
When inserting the tip side pin in the main joining step, insert the tip side pin while rotating at a speed higher than the predetermined rotation speed, and move to the set movement route while gradually decreasing the rotation speed. The manufacturing method of the liquid cooling jacket according to claim 1, characterized in that A method for manufacturing a liquid cooling jacket by friction stir welding a jacket body having a bottom portion, a peripheral wall portion rising from the peripheral edge of the bottom portion, and a sealing body for sealing an opening of the jacket body, the method comprising:
The jacket body is made of a material having a hardness higher than that of the sealing body,
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 pin step portion is formed on an outer peripheral surface of the proximal pin,
The outer peripheral surface of the tip-side pin is tapered, and the tip-side pin has a flat surface perpendicular to the rotation center axis of the rotary tool at its tip, and a projection protruding from the flat surface. having a department,
a preparation step of forming a peripheral wall stepped portion having a stepped bottom surface and a stepped side surface rising from the stepped bottom surface toward the opening at the inner peripheral edge of the peripheral wall portion;
The sealing body is placed on the jacket main body, and 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 and the sealing body are formed. a placing step of overlapping the back surface to form a second butted portion;
inserting the tip surface of the protrusion to the same depth as or slightly deeper than the bottom surface of the step while bringing the flat surface of the tip-side pin of the rotating tool into contact only with the sealing body; While the outer peripheral surface of the proximal side pin is in contact with the surface of the sealing body, the outer peripheral surface of the distal side pin is slightly in contact with at least the upper side of the jacket main body. A main joining step of forming a coarse and dense portion of a predetermined width in a portion adjacent to the stepped side surface in the plasticized region while performing friction stir by rotating the rotating tool along a set movement route set on the sealing body side. , including
In the main joining step, the tip side pin is inserted from a start position set on the set movement route, and the tip side pin is gradually pushed in until a predetermined depth is reached while moving in the advancing direction. A method for manufacturing a liquid cooling jacket. In the main welding step, friction stir is performed by rotating the rotating tool at a predetermined rotational speed,
When inserting the tip side pin in the main joining step, insert the tip side pin while rotating at a speed higher than the predetermined rotation speed, and move to the set movement route while gradually decreasing the rotation speed. 4. The method for manufacturing a liquid cooling jacket according to claim 3, characterized in that: A method for manufacturing a liquid cooling jacket by friction stir welding a jacket body having a bottom portion, a peripheral wall portion rising from the peripheral edge of the bottom portion, and a sealing body for sealing an opening of the jacket body, the method comprising:
The jacket body is made of a material having a hardness higher than that of the sealing body,
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 pin step portion is formed on an outer peripheral surface of the proximal pin,
The outer peripheral surface of the tip-side pin is tapered, and the tip-side pin has a flat surface perpendicular to the rotation center axis of the rotary tool at its tip, and a projection protruding from the flat surface. having a department,
a preparation step of forming a peripheral wall stepped portion having a stepped bottom surface and a stepped side surface rising from the stepped bottom surface toward the opening at the inner peripheral edge of the peripheral wall portion;
The sealing body is placed on the jacket main body, and 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 and the sealing body are formed. a placing step of overlapping the back surface to form a second butted portion;
inserting the tip surface of the protrusion to the same depth as or slightly deeper than the bottom surface of the step while bringing the flat surface of the tip-side pin of the rotating tool into contact only with the sealing body; While the outer peripheral surface of the proximal side pin is in contact with the surface of the sealing body, the outer peripheral surface of the distal side pin is slightly in contact with at least the upper side of the jacket main body. A main joining step of forming a coarse and dense portion of a predetermined width in a portion adjacent to the stepped side surface in the plasticized region while performing friction stir by rotating the rotating tool along a set movement route set on the sealing body side. , including
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 rotary tool is separated from the sealing body at the end position by gradually pulling out the sealing body. In the main welding step, friction stir is performed by rotating the rotating tool at a predetermined rotational speed,
6. The manufacture of the liquid cooling jacket according to claim 5, characterized in that when the pin on the tip end 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. Method. A method for manufacturing a liquid cooling jacket by friction stir welding a jacket body having a bottom portion, a peripheral wall portion rising from the peripheral edge of the bottom portion, and a sealing body for sealing an opening of the jacket body, the method comprising:
The jacket body is made of a material having a hardness higher than that of the sealing body,
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 pin step portion is formed on an outer peripheral surface of the proximal pin,
The outer peripheral surface of the tip-side pin is tapered, and the tip-side pin has a flat surface perpendicular to the rotation center axis of the rotary tool at its tip, and a projection protruding from the flat surface. having a department,
a preparation step of forming a peripheral wall stepped portion having a stepped bottom surface and a stepped side surface rising from the stepped bottom surface toward the opening at the inner peripheral edge of the peripheral wall portion;
The sealing body is placed on the jacket main body, and 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 and the sealing body are formed. a placing step of overlapping the back surface to form a second butted portion;
inserting the tip surface of the protrusion to the same depth as or slightly deeper than the bottom surface of the step while bringing the flat surface of the tip-side pin of the rotating tool into contact only with the sealing body; While the outer peripheral surface of the proximal side pin is in contact with the surface of the sealing body, the outer peripheral surface of the distal side pin is slightly in contact with at least the upper side of the jacket main body. A main joining step of forming a coarse and dense portion of a predetermined width in a portion adjacent to the stepped side surface in the plasticized region while performing friction stir by rotating the rotating tool along a set movement route set on the sealing body side. , including
In the main welding step, an end position is set on the set movement route, and after the friction stir welding of the first abutting 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 welding step, friction stir is performed by rotating the rotating tool at a predetermined rotational speed,
8. The manufacture of the liquid cooling jacket according to claim 7, characterized in that when the pin on the tip side is removed in the main joining step, the pin is moved to the end position while gradually increasing the rotation speed from the predetermined rotation speed. Method.

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