CN110691667A

CN110691667A - Method for manufacturing liquid cooling jacket

Info

Publication number: CN110691667A
Application number: CN201880035508.1A
Authority: CN
Inventors: 堀久司; 濑尾伸城
Original assignee: Nippon Light Metal Co Ltd
Current assignee: Nippon Light Metal Co Ltd
Priority date: 2017-10-27
Filing date: 2018-06-25
Publication date: 2020-01-14
Also published as: WO2019082439A1

Abstract

A method for manufacturing a liquid-cooled jacket, the liquid-cooled jacket being configured from a jacket main body (2) and a sealing member (3), the sealing member including a hole portion (4) into which a tip end of a support (15) is inserted and closing an opening portion of the jacket main body (2), the method for manufacturing a liquid-cooled jacket being characterized in that the jacket main body (2) and the sealing member (3) are joined by friction stirring, the method comprising: a first primary joining step of inserting only the rotating stirring pin into the seal (3), and rotating the rotating tool once along the first butt joint section (J1) to perform friction stirring while bringing only the stirring pin into contact with only the seal (3); and a second primary joining step of inserting only the rotating stirring pin into the seal (3), and rotating the rotating tool once along the third butting portion (J3) to perform friction stirring while slightly contacting the stirring pin with the step side surface (17b) of the pillar step portion (17).

Description

Method for manufacturing liquid cooling jacket

Technical Field

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

Background

For example, patent document 1 discloses a method for manufacturing a liquid-cooled jacket. Fig. 41 is a sectional view showing a method of manufacturing a conventional liquid-cooled jacket. In the conventional method for manufacturing a liquid-cooled jacket, a butt joint J10 formed by butting a step side surface 101c provided in a step portion of an aluminum alloy jacket main body 101 and a side surface 102c of an aluminum alloy seal 102 is friction stir welded. In the conventional method for manufacturing a liquid-cooled jacket, only the stirring pin F2 of the rotary tool F is inserted into the butting portion J10 to perform friction stir welding. In the conventional method for manufacturing a liquid-cooled jacket, the rotation center axis C of the rotary tool F is relatively moved so as to overlap the butting portion J10.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open No. 2015-131321

Disclosure of Invention

Technical problem to be solved by the invention

Here, the jacket main body 101 is easily formed into a complicated shape, for example, by a casting material of 4000 series aluminum alloy, while a member having a relatively simple shape like the closure 102 is sometimes formed by an expanded material of 1000 series aluminum alloy. In this case, the liquid-cooled jacket may be manufactured by joining members made of different types of aluminum alloys. In this case, since the hardness of the sleeve main body 101 is generally higher than that of the seal 102, when the friction stir welding is performed as shown in fig. 41, the material resistance received by the stir pin from the sleeve main body 101 side is higher than the material resistance received by the seal 102 side. Therefore, it is difficult to stir different types of materials with high balance by the stirring pin of the rotary tool F, and there is a problem that a void defect occurs in a plasticized region after joining, and the joining strength is lowered.

From such a viewpoint, an object of the present invention is to provide a method for manufacturing a liquid-cooled jacket, which can satisfactorily join aluminum alloys of different types of materials.

Technical scheme for solving technical problem

In order to solve the above-described problems, the present invention is a method for manufacturing a liquid-cooled jacket including a jacket main body and a sealing material, wherein the jacket main body includes a bottom portion, a peripheral wall portion rising from a peripheral edge of the bottom portion, and a pillar rising from the bottom portion, and the sealing material includes a hole portion into which a tip end of the pillar is inserted and closes an opening portion of the jacket main body, and in the method for manufacturing a liquid-cooled jacket, the jacket main body and the sealing material are joined by friction stirring, wherein the jacket main body is formed of a first aluminum alloy, the sealing material is formed of a second aluminum alloy, the first aluminum alloy is a material type having a hardness higher than that of the second aluminum alloy, and an outer peripheral surface of a stirring pin of a rotary tool is inclined so as to be tapered, the method including: a preparation step of forming a peripheral wall step portion on an inner peripheral edge of the peripheral wall portion, the peripheral wall step portion having a step bottom surface and step side surfaces rising obliquely so as to extend outward from the step bottom surface toward the opening portion, and a pillar step portion having a step bottom surface and step side surfaces rising from the step bottom surface being formed at a front end of the pillar; a mounting step of mounting the seal on the jacket main body so that a level difference side surface of the peripheral wall level difference portion is brought into abutment with an outer peripheral side surface of the seal to form a first abutment portion, and a level difference bottom surface of the peripheral wall level difference portion is brought into abutment with a back surface of the seal to form a second abutment portion, and then a level difference side surface of the strut level difference portion is brought into abutment with a hole wall of the hole portion of the seal to form a third abutment portion, and a level difference bottom surface of the strut level difference portion is brought into abutment with the back surface of the seal to form a fourth abutment portion; a first primary welding step of inserting only the rotating stirring pin into the seal member, and rotating the rotating tool by one rotation along the first butting portion while bringing only the stirring pin into contact with only the seal member, thereby performing friction stirring; and a second primary welding step of inserting only the rotating stirring pin into the seal member, and rotating the rotating tool by one rotation along the third butting portion while slightly contacting the stirring pin with the step side surface of the pillar step portion to perform friction stirring.

According to the above production method, the second aluminum alloy on the main seal side in the first butt joint portion is stirred by frictional heat of the seal and the stirring pin to be plastically fluidized, so that the step side surface and the outer peripheral side surface of the seal can be joined at the first butt joint portion. Further, friction stirring is performed by bringing only the stirring pin into contact with only the seal member, and therefore, the first aluminum alloy hardly mixes into the seal member from the jacket main body. Further, at the third butting portion, only the stirring pin is kept in slight contact with the step side face. Thus, the second aluminum alloy, which is mainly on the closure side, is friction-stirred at the first butting portion and the third butting portion, and therefore, a decrease in the joining strength can be suppressed. Further, since the step side surface of the sleeve main body is inclined outward, contact of the stirring pin with the sleeve main body can be easily avoided without causing a decrease in the joining strength. Further, the strength of the liquid-cooled jacket can be improved by joining the stay and the seal member.

In the second primary welding step, it is preferable that the rotating tool is rotated once along the third butting portion to perform friction stirring while the stirring pin is in slight contact with the stepped bottom surface of the pillar stepped portion.

According to the above manufacturing method, only the stirring pin is held in slight contact with the level difference bottom surface at the fourth butting portion. Thereby, the aluminum alloy mainly on the closure side is friction-stirred at the fourth butting portion, and therefore, a reduction in the joining strength can be prevented. Further, the fourth butted portion is friction-stirred, whereby the joining strength can be further improved.

Further, the present invention is a method for manufacturing a liquid-cooled jacket including a jacket main body and a sealing material, wherein the jacket main body includes a bottom portion, a peripheral wall portion rising from a peripheral edge of the bottom portion, and a pillar rising from the bottom portion, and the sealing material includes a hole portion into which a tip end of the pillar is inserted and closes an opening portion of the jacket main body, and in the method for manufacturing a liquid-cooled jacket, the jacket main body and the sealing material are joined by friction stirring, wherein the jacket main body is formed of a first aluminum alloy, the sealing material is formed of a second aluminum alloy, the first aluminum alloy is a material type having a higher hardness than that of the second aluminum alloy, and an outer peripheral surface of a stirring pin of a rotary tool is inclined so as to be tapered, the method including: a preparation step of forming a peripheral wall step portion on an inner peripheral edge of the peripheral wall portion, the peripheral wall step portion having a step bottom surface and step side surfaces rising obliquely so as to extend outward from the step bottom surface toward the opening portion, and a pillar step portion having a step bottom surface and step side surfaces rising from the step bottom surface being formed at a front end of the pillar; a mounting step of mounting the seal on the jacket main body so that a level difference side surface of the peripheral wall level difference portion is brought into abutment with an outer peripheral side surface of the seal to form a first abutment portion, and a level difference bottom surface of the peripheral wall level difference portion is brought into abutment with a back surface of the seal to form a second abutment portion, and then a level difference side surface of the strut level difference portion is brought into abutment with a hole wall of the hole portion of the seal to form a third abutment portion, and a level difference bottom surface of the strut level difference portion is brought into abutment with the back surface of the seal to form a fourth abutment portion; a first primary welding step of inserting only the rotating stirring pin into the seal member, and rotating the rotating tool by one rotation along the first butting portion while slightly contacting the stirring pin with the step side surface of the peripheral wall step portion to perform friction stirring; and a second primary welding step of inserting only the rotating stirring pin into the seal member, and rotating the rotating tool by one rotation along the third butting portion while slightly contacting the stirring pin with the step side surface of the pillar step portion to perform friction stirring.

According to the above production method, the second aluminum alloy on the main seal side in the first butt joint portion is stirred by frictional heat of the seal and the stirring pin to be plastically fluidized, so that the step side surface and the outer peripheral side surface of the seal can be joined at the first butt joint portion. Further, since the outer peripheral surface of the stirring pin is kept in slight contact with the stepped side surface of the sleeve body, the mixing of the first aluminum alloy from the sleeve body into the seal can be reduced as much as possible. Further, since the stirring pin is kept in slight contact with the step side surface also at the third butting portion, the mixing of the first aluminum alloy from the jacket main body into the seal can be reduced as much as possible. Thus, the second aluminum alloy, which is mainly on the closure side, is friction-stirred at the first butting portion and the third butting portion, and therefore, a decrease in the joining strength can be suppressed. Further, since the step side surface of the sleeve main body is inclined outward, the first butting portion can be joined without the stirring pin entering the sleeve main body to a large extent. Further, the strength of the liquid-cooled jacket can be improved by joining the stay and the seal member.

In the first primary welding step, it is preferable that the rotating tool is rotated one turn along the first butting portion to perform friction stirring while the stirring pin is brought into slight contact with the stepped bottom surface of the peripheral wall stepped portion.

According to the above manufacturing method, only the stirring pin is held in slight contact with the stepped bottom surface at the second butting portion. Thereby, the second aluminum alloy, which is mainly the closure side, at the second butt joint portion is friction-stirred, and therefore, a decrease in the joint strength can be prevented. Further, the friction stir welding is also performed on the second butted portion, whereby the joining strength can be further improved.

According to the above manufacturing method, only the stirring pin is held in slight contact with the level difference bottom surface at the fourth butting portion. Thereby, the second aluminum alloy, which is mainly the closure side, is friction-stirred at the fourth butting portion, and therefore, a reduction in the joining strength can be prevented. Further, the fourth butted portion is friction-stirred, whereby the joining strength can be further improved.

Further, it is preferable that in the preparation process, the cover main body is formed by molding and the bottom portion is formed to protrude toward the front side, and the closure is formed to protrude toward the front side.

The heat shrinkage occurs in the plasticized region due to the heat input of the friction stir welding, and the seal member side of the liquid-cooled jacket may be deformed in a concave manner.

In addition, it is preferable that a deformation amount of the sleeve main body is measured in advance, and in the first primary welding step and the second primary welding step, friction stirring is performed while adjusting an insertion depth of a stirring pin of the rotary tool according to the deformation amount.

According to the above manufacturing method, even when the sleeve body and the seal are convexly bent and friction stir welded, the length and the width of the plasticized region formed on the liquid cooling sleeve can be made constant.

In addition, it is preferable that a temporary joining step be included before the first primary joining step and the second primary joining step, and in the temporary joining step, at least one of the first butting portion and the third butting portion be temporarily joined.

According to the manufacturing method, the temporary joining can prevent the joint portions from being cracked in the first primary joining step and the second primary joining step.

In the first primary welding step and the second primary welding step, it is preferable that a cooling plate through which a cooling medium flows is provided on the back surface side of the bottom portion, and friction stirring is performed while the jacket main body and the seal are cooled by the cooling plate.

According to the above manufacturing method, since the frictional heat can be suppressed to a low level, the deformation of the liquid-cooled jacket due to thermal shrinkage can be reduced.

Further, it is preferable that the front surface of the cooling plate is in surface-contact with the back surface of the bottom portion. According to the manufacturing method, the cooling efficiency can be improved.

Further, it is preferable that the cooling plate has a cooling flow path through which the cooling medium flows, and the cooling flow path has a planar shape along a movement locus of the rotary tool in the first primary welding step.

According to the above manufacturing method, the friction-stirred portion can be intensively cooled, and therefore, the cooling efficiency can be further improved.

Preferably, the cooling flow path through which the cooling medium flows is constituted by a cooling pipe embedded in the cooling plate. According to the above manufacturing method, management of the cooling medium can be easily performed.

In the first primary welding step and the second primary welding step, it is preferable that a cooling medium is caused to flow through a hollow portion formed by the jacket main body and the seal member, and friction stirring is performed while cooling the jacket main body and the seal member.

According to the above manufacturing method, since the frictional heat can be suppressed to a low level, the deformation of the liquid-cooled jacket due to thermal shrinkage can be reduced. Further, the jacket body itself can be cooled without using a cooling plate or the like.

In order to solve the above technical problems, the present invention is a method for manufacturing a liquid cooling jacket, the liquid cooling jacket being composed of a jacket main body and a sealing member, wherein the cover main body has a bottom portion, a peripheral wall portion rising from a peripheral edge of the bottom portion, and a pillar rising from the bottom portion, the closing member forms a hole portion into which the front end of the pillar is inserted, and closes the opening portion of the jacket main body, in the method of manufacturing the liquid-cooled jacket, the jacket main body and the closure are joined by friction stirring, wherein the sleeve main body is formed of a first aluminum alloy, the closing member is formed of a second aluminum alloy, the first aluminum alloy is a material having a hardness higher than that of the second aluminum alloy, a method for manufacturing a liquid-cooled jacket, in which an outer peripheral surface of a stirring pin of a rotary tool used for friction stirring is inclined so that a tip thereof becomes thin, includes: a preparation step of forming a peripheral wall step portion on an inner peripheral edge of the peripheral wall portion, the peripheral wall step portion having a step bottom surface and step side surfaces rising from the step bottom surface toward the opening portion, and forming a pillar step portion at a front end of the pillar, the pillar step portion having a step bottom surface and step side surfaces rising obliquely from the step bottom surface so that the front end of the pillar becomes thinner, and then setting a plate thickness of the closure to be larger than a height dimension of the step side surfaces of the pillar step portion; a mounting step of mounting the seal on the jacket main body so that a step side surface of the peripheral wall step portion is brought into abutment with an outer peripheral side surface of the seal to form a first abutment portion, a step bottom surface of the peripheral wall step portion is brought into abutment with a back surface of the seal to form a second abutment portion, a third abutment portion is formed so that a gap is present when the step side surface of the strut step portion is brought into abutment with the hole wall of the hole portion, and a step bottom surface of the strut step portion is brought into abutment with the back surface of the seal to form a fourth abutment portion; and a second primary welding step of inserting only the rotating stirring pin into the seal member and performing friction stirring while allowing the second aluminum alloy of the seal member to flow into the gap when the rotating tool is moved along the third butting portion in a state where the outer peripheral surface of the stirring pin is not in contact with the step side surface of the pillar step portion.

According to the above production method, the second aluminum alloy on the main seal side in the third butt joint portion is stirred by frictional heat of the seal and the stirring pin to be plastically fluidized, whereby the step side surface of the pillar step portion and the hole wall of the hole portion can be joined at the third butt joint portion. Further, friction stirring is performed by bringing only the stirring pin into contact with the seal, and therefore, the first aluminum alloy hardly enters the seal from the jacket main body. Thereby, the second aluminum alloy, which is mainly the closure side, is friction-stirred at the third butting portion, and therefore, a decrease in the joining strength can be suppressed. Further, by increasing the plate thickness of the seal, insufficient metal at the joint portion in the second primary joining step can be prevented.

In the second primary welding step, it is preferable that the rotating tool is moved along the third butting portion while the stirring pin is in slight contact with the stepped bottom surface of the pillar stepped portion, and friction stirring is performed. According to the above manufacturing method, the fourth butting portion can be firmly joined, and water-tightness and air-tightness can be improved.

Further, the present invention is a method for manufacturing a liquid-cooled jacket including a jacket main body and a sealing material, wherein the jacket main body includes a bottom portion, a peripheral wall portion rising from a peripheral edge of the bottom portion, and a pillar rising from the bottom portion, and the sealing material forms a hole portion into which a tip end of the pillar is inserted and closes an opening portion of the jacket main body, and in the method for manufacturing a liquid-cooled jacket, the jacket main body and the sealing material are joined by friction stirring, wherein the jacket main body is formed of a first aluminum alloy, the sealing material is formed of a second aluminum alloy, the first aluminum alloy is a material type having a hardness higher than that of the second aluminum alloy, and an outer peripheral surface of a stirring pin of a rotary tool used for friction stirring is inclined so as to be tapered, the method including: a preparation step of forming a peripheral wall step portion on an inner peripheral edge of the peripheral wall portion, the peripheral wall step portion having a step bottom surface and step side surfaces rising from the step bottom surface toward the opening portion, and forming a pillar step portion at a front end of the pillar, the pillar step portion having a step bottom surface and step side surfaces rising obliquely from the step bottom surface so that the front end of the pillar becomes thinner, and then setting a plate thickness of the closure to be larger than a height dimension of the step side surfaces of the pillar step portion; a mounting step of mounting the seal on the jacket main body so that a step side surface of the peripheral wall step portion is brought into abutment with an outer peripheral side surface of the seal to form a first abutment portion, a step bottom surface of the peripheral wall step portion is brought into abutment with a back surface of the seal to form a second abutment portion, a third abutment portion is formed so that a gap is present when the step side surface of the strut step portion is brought into abutment with the hole wall of the hole portion, and a step bottom surface of the strut step portion is brought into abutment with the back surface of the seal to form a fourth abutment portion; and a second primary welding step of inserting only the rotating stirring pin into the seal member and performing friction stirring while allowing the second aluminum alloy of the seal member to flow into the gap when the rotating tool is moved along the third butting portion in a state where the outer peripheral surface of the stirring pin is slightly in contact with the step side surface of the pillar step portion.

According to the above production method, the second aluminum alloy on the main seal side in the third butt joint portion is stirred by frictional heat of the seal and the stirring pin to be plastically fluidized, whereby the step side surface of the pillar step portion and the hole wall of the hole portion can be joined at the third butt joint portion. Further, since the outer peripheral surface of the stirring pin is kept in slight contact with the stepped side surface of the pillar stepped portion, the mixing of the first aluminum alloy from the jacket main body into the seal can be reduced as much as possible. Thereby, the second aluminum alloy, which is mainly the closure side, is friction-stirred at the third butting portion, and therefore, a decrease in the joining strength can be suppressed. Further, by increasing the plate thickness of the seal, insufficient metal at the joint portion in the second primary joining step can be prevented.

In the second primary welding step, it is preferable that the rotating tool is moved along the third butting portion while the stirring pin is in slight contact with the stepped bottom surface of the pillar stepped portion, and friction stirring is performed. According to the manufacturing method, the fourth butting portion can be firmly joined.

Preferably, a first primary welding step is performed in which the rotating tool is moved along the first butting portion and rotated once around the opening portion to perform friction stirring.

According to the manufacturing method, the water tightness and the air tightness of the liquid cooling jacket can be improved.

In order to solve the above-described problems, the present invention is a method of manufacturing a liquid-cooled jacket including a jacket main body and a sealing material, wherein the jacket main body includes a bottom portion, a peripheral wall portion rising from a peripheral edge of the bottom portion, and a pillar rising from the bottom portion, and the sealing material includes a hole portion into which a tip end of the pillar is inserted and closes an opening portion of the jacket main body, and in the method of manufacturing a liquid-cooled jacket, the jacket main body and the sealing material are joined by friction stirring, characterized in that the jacket main body is formed of a first aluminum alloy, the sealing material is formed of a second aluminum alloy, the first aluminum alloy is a material type having a hardness higher than that of the second aluminum alloy, an outer peripheral surface of a stirring pin of a rotary tool is inclined so as to be tapered, a flat surface is formed on a tip end side of the stirring pin, and a protruding portion is provided on the flat surface, the manufacturing method of the liquid cooling jacket comprises the following steps: a preparation step of forming a peripheral wall step portion on an inner peripheral edge of the peripheral wall portion, the peripheral wall step portion having a step bottom surface and step side surfaces rising from the step bottom surface toward the opening portion, and forming a pillar step portion at a front end of the pillar, the pillar step portion having a step bottom surface and step side surfaces rising from the step bottom surface; a mounting step of mounting the seal on the jacket main body so that a level difference side surface of the peripheral wall level difference portion is brought into abutment with an outer peripheral side surface of the seal to form a first abutment portion, and a level difference bottom surface of the peripheral wall level difference portion is brought into abutment with a back surface of the seal to form a second abutment portion, and then a level difference side surface of the strut level difference portion is brought into abutment with a hole wall of the hole portion of the seal to form a third abutment portion, and a level difference bottom surface of the strut level difference portion is brought into abutment with the back surface of the seal to form a fourth abutment portion; and a second primary welding step of inserting only the rotating stirring pin into the seal member, and performing friction stirring by moving the rotating tool along the third butting portion while keeping the outer peripheral surface of the stirring pin out of contact with the step side surface of the pillar step portion and keeping the protrusion of the stirring pin in contact with the step bottom surface of the pillar step portion.

According to the above production method, the second aluminum alloy on the main seal side in the third butt joint portion is stirred by frictional heat of the seal and the stirring pin to be plastically fluidized, whereby the step side surface of the pillar step portion and the hole wall of the hole portion can be joined at the third butt joint portion. Further, friction stirring is performed by bringing only the outer peripheral surface of the stirring pin into contact with only the seal, and therefore, the first aluminum alloy hardly enters the seal from the jacket main body. The plastic fluidized material that is friction-stirred along the projection of the stirring pin and is wound up at the projection is pressed by the flat surface of the stirring pin. This ensures friction stirring around the projection, and also ensures that the oxide film of the fourth butting portion is cut off, thereby improving the bonding strength of the fourth butting portion.

In the second primary welding step, it is preferable that the rotating tool is moved along the third butting portion so as to perform friction stirring while the flat surface of the stirring pin is not in contact with the stepped bottom surface of the pillar stepped portion.

According to the above manufacturing method, since the mixing of the first aluminum alloy into the seal from the jacket main body can be further reduced, the reduction of the bonding strength can be effectively suppressed. Further, since the width of the plasticized region is reduced, the plastic fluidizing material can be prevented from flowing out from the fourth butting portion, and the step bottom face of the pillar step portion can be set small.

Further, the present invention is a method of manufacturing a liquid-cooled jacket including a jacket main body and a sealing material, wherein the jacket main body has a bottom portion, a peripheral wall portion rising from a peripheral edge of the bottom portion, and a pillar rising from the bottom portion, and the sealing material includes a hole portion into which a tip end of the pillar is inserted and closes an opening portion of the jacket main body, and in the method of manufacturing a liquid-cooled jacket, the jacket main body and the sealing material are joined by friction stirring, characterized in that the jacket main body is formed of a first aluminum alloy, the sealing material is formed of a second aluminum alloy, the first aluminum alloy is a material type having a higher hardness than that of the second aluminum alloy, an outer peripheral surface of a stirring pin of a rotary tool is inclined so as to be tapered at a tip end, a flat surface is formed at a tip end side of the stirring pin, and a protruding portion is included in the flat surface, the manufacturing method of the liquid cooling jacket comprises the following steps: a preparation step of forming a peripheral wall step portion on an inner peripheral edge of the peripheral wall portion, the peripheral wall step portion having a step bottom surface and step side surfaces rising from the step bottom surface toward the opening portion, and forming a pillar step portion at a front end of the pillar, the pillar step portion having a step bottom surface and step side surfaces rising from the step bottom surface; a mounting step of mounting the seal on the jacket main body so that a level difference side surface of the peripheral wall level difference portion is brought into abutment with an outer peripheral side surface of the seal to form a first abutment portion, and a level difference bottom surface of the peripheral wall level difference portion is brought into abutment with a back surface of the seal to form a second abutment portion, and then a level difference side surface of the strut level difference portion is brought into abutment with a hole wall of the hole portion of the seal to form a third abutment portion, and a level difference bottom surface of the strut level difference portion is brought into abutment with the back surface of the seal to form a fourth abutment portion; and a second primary welding step of inserting only the rotating stirring pin into the seal member, and moving the rotating tool along the third butting portion to perform friction stirring while bringing the outer peripheral surface of the stirring pin into slight contact with the step side surface of the pillar step portion and bringing the protrusion of the stirring pin into contact with the step bottom surface of the pillar step portion.

According to the above production method, the second aluminum alloy on the main seal side in the third butt joint portion is stirred by frictional heat of the seal and the stirring pin to be plastically fluidized, whereby the step side surface of the pillar step portion and the hole wall of the hole portion can be joined at the third butt joint portion. Further, since the outer peripheral surface of the stirring pin is kept in slight contact with the stepped side surface of the pillar stepped portion, the mixing of the first aluminum alloy from the jacket main body into the seal can be reduced as much as possible. Thereby, the second aluminum alloy, which is mainly the closure side, is friction-stirred at the third butting portion, and therefore, a decrease in the joining strength can be suppressed. The plastic fluidized material that is friction-stirred along the projection of the stirring pin and is wound up at the projection is pressed by the flat surface of the stirring pin. This makes it possible to more reliably perform friction stirring around the projection portion and to reliably cut the oxide film of the fourth butting portion, thereby improving the bonding strength of the fourth butting portion.

According to the above manufacturing method, since the mixing of the first aluminum alloy from the jacket main body into the seal can be further reduced, the decrease in the bonding strength can be effectively suppressed. Further, since the width of the plasticized region is reduced, the plastic fluidizing material can be prevented from flowing out from the fourth butting portion, and the step bottom face of the pillar step portion can be set small.

Preferably, the method of manufacturing the liquid-cooled jacket includes a first primary welding step of performing friction stirring by moving the rotary tool along the first butting portion and rotating the rotary tool around the opening portion once.

Effects of the invention

According to the method for manufacturing a liquid-cooled jacket of the present invention, aluminum alloys of different material types can be preferably joined.

Drawings

Fig. 1 is a perspective view showing a preparation step of a method for manufacturing a liquid cooling jacket according to a first embodiment of the present invention.

Fig. 2 is a cross-sectional view showing a mounting step of the method for manufacturing a liquid-cooled jacket according to the first embodiment.

Fig. 3 is a perspective view showing a first primary bonding step of the method for manufacturing a liquid-cooled jacket according to the first embodiment.

Fig. 4 is a cross-sectional view showing a first main joining step of the method for manufacturing a liquid-cooled jacket according to the first embodiment.

Fig. 5 is a cross-sectional view showing the method for manufacturing a liquid-cooled jacket according to the first embodiment after the first main bonding step.

Fig. 6 is a perspective view showing a second primary bonding step of the method for manufacturing a liquid-cooled jacket according to the first embodiment.

Fig. 7 is a sectional view showing a second main joining step of the method for manufacturing a liquid-cooled jacket according to the first embodiment.

Fig. 8 is a cross-sectional view showing a mounting step of a method of manufacturing a liquid cooling jacket according to a first modification of the first embodiment.

Fig. 9 is a cross-sectional view showing a mounting step of a method of manufacturing a liquid cooling jacket according to a second modification of the first embodiment.

Fig. 10 is a sectional view showing a first main joining step of the method for manufacturing a liquid-cooled jacket according to the second embodiment of the present invention.

Fig. 11 is a sectional view showing a first main joining step of a method of manufacturing a liquid-cooled jacket according to a third embodiment of the present invention.

Fig. 12 is a sectional view showing a first main joining step of a method of manufacturing a liquid-cooled jacket according to a fourth embodiment of the present invention.

Fig. 13 is a cross-sectional view showing a first main joining step of the method of manufacturing a liquid-cooled jacket according to the first modification of the fourth embodiment.

Fig. 14 is a sectional view showing a second main joining step of the method for manufacturing a liquid-cooled jacket according to the fifth embodiment of the present invention.

Fig. 15 is a sectional view showing a second main joining step of the method of manufacturing a liquid-cooled jacket according to the first modification of the fifth embodiment.

Fig. 16 is a sectional view showing a second main joining step of the method for manufacturing a liquid-cooled jacket according to the sixth embodiment of the present invention.

Fig. 17 is a perspective view showing a third modification of the method of manufacturing the liquid-cooled jacket according to the first embodiment.

Fig. 18A is a perspective view of a table showing a fourth modification of the method of manufacturing a liquid-cooled jacket according to the first embodiment.

Fig. 18B is a perspective view showing a state in which the jacket main body and the seal are fixed to the table in a fourth modification of the method for manufacturing a liquid-cooled jacket according to the first embodiment.

Fig. 19 is an exploded perspective view showing a fifth modification of the method of manufacturing the liquid cooling jacket according to the first embodiment.

Fig. 20 is a perspective view showing a state in which the jacket main body and the seal member of the fifth modification of the method for manufacturing a liquid-cooled jacket according to the first embodiment are fixed to the table.

Fig. 21 is a perspective view showing a preparation step of a method for manufacturing a liquid cooling jacket according to a seventh embodiment of the present invention.

Fig. 22 is a sectional view showing a mounting step of the method of manufacturing a liquid cooling jacket according to the seventh embodiment.

Fig. 23 is a perspective view showing a first primary bonding step of the method of manufacturing a liquid-cooled jacket according to the seventh embodiment.

Fig. 24 is a sectional view showing a first main joining step of the method of manufacturing a liquid-cooled jacket according to the seventh embodiment.

Fig. 25 is a cross-sectional view showing the method for manufacturing a liquid-cooled jacket according to the seventh embodiment after the first main bonding step.

Fig. 26 is a perspective view showing a second primary bonding step in the method for manufacturing a liquid-cooled jacket according to the seventh embodiment.

Fig. 27 is a sectional view showing a second main joining step of the method for manufacturing a liquid-cooled jacket according to the seventh embodiment of the present invention.

Fig. 28 is a sectional view showing a first main joining step of the method of manufacturing a liquid-cooled jacket according to the eighth embodiment of the present invention.

Fig. 29 is a sectional view showing a first main joining step of the method of manufacturing a liquid-cooled jacket according to the ninth embodiment of the present invention.

Fig. 30 is a sectional view showing a first main joining step of a method of manufacturing a liquid-cooled jacket according to a tenth embodiment of the present invention.

Fig. 31 is a sectional view showing a second main joining step of the method of manufacturing a liquid-cooled jacket according to the eleventh embodiment of the present invention.

Fig. 32 is a perspective view showing a preparation step of a method for manufacturing a liquid cooling jacket according to a twelfth embodiment of the present invention.

Fig. 33 is a sectional view showing a mounting step of the method of manufacturing a liquid-cooled jacket according to the twelfth embodiment.

Fig. 34 is a perspective view showing a first primary bonding step of the method for manufacturing a liquid-cooled jacket according to the twelfth embodiment.

Fig. 35 is a sectional view showing a first main joining step of the method of manufacturing a liquid-cooled jacket according to the twelfth embodiment.

Fig. 36 is a cross-sectional view showing the method for manufacturing a liquid-cooled jacket according to the twelfth embodiment after the first main joining step.

Fig. 37 is a perspective view showing a second primary bonding step of the method for manufacturing a liquid-cooled jacket according to the twelfth embodiment.

Fig. 38 is a sectional view showing a second main joining step of the method for manufacturing a liquid-cooled jacket according to the twelfth embodiment of the present invention.

Fig. 39 is a sectional view showing a first primary bonding step of a method of manufacturing a liquid-cooled jacket according to a thirteenth embodiment of the present invention.

Fig. 40 is a sectional view showing a second main joining step of the method for manufacturing a liquid-cooled jacket according to the fourteenth embodiment of the present invention.

Fig. 41 is a sectional view showing a method of manufacturing a conventional liquid-cooled jacket.

Detailed Description

[ first embodiment ]

A method for manufacturing a liquid-cooled jacket according to an embodiment of the present invention will be described in detail with reference to the drawings. As shown in fig. 1, the liquid-cooled jacket 1 is manufactured by friction stir joining the jacket main body 2 and the closure 3. The liquid cooling jacket 1 is a member in which a heating element (not shown) is provided on the sealing member 3, and a fluid is caused to flow therein to perform heat exchange with the heating element. In the following description, the "front surface" refers to a surface opposite to the "back surface".

In the method of manufacturing a liquid cooling jacket according to the present embodiment, a preparation step, a mounting step, a first primary bonding step, and a second primary bonding step are performed. The preparation step is a step of preparing the sleeve body 2 and the seal 3. The jacket main body 2 is mainly composed of a bottom 10, a peripheral wall 11, and a plurality of stays 15. The jacket main body 2 is formed to mainly contain the first aluminum alloy. The first aluminum alloy is cast using an aluminum alloy such as JISH5302ADC12 (Al-Si-Cu series), for example.

As shown in fig. 1, the bottom portion 10 is a plate-like member having a rectangular shape in a plan view. The peripheral wall 11 is a wall rising in a rectangular frame shape from the peripheral edge of the bottom 10. A peripheral wall step portion 12 is formed on the inner peripheral edge of the peripheral wall portion 11. The peripheral wall step portion 12 is composed of a step bottom surface 12a and a step side surface 12b rising from the step bottom surface 12 a. As shown in fig. 2, the level difference side surface 12b is inclined so as to extend outward from the level difference bottom surface 12a toward the opening. The inclination angle β of the step side surface 12b may be appropriately set, and may be, for example, 3 ° to 30 ° with respect to the plumb surface. The recess 13 is formed by the bottom 10 and the peripheral wall 11.

As shown in fig. 1, the pillars 15 stand vertically from the bottom 10. The number of the support columns 15 is not limited, but four support columns are formed in the present embodiment. Further, although the shape of the support column 15 is a cylindrical shape in the present embodiment, other shapes are also possible. A projection 16 is formed at the front end of the pillar 15. The shape of the protruding portion 16 is not limited, but is cylindrical in the present embodiment. The height of the projection 16 is the same as the plate thickness of the closure 3. The pillar step 17 is formed by the end surface of the pillar 15 and the protrusion 16. The pillar step 17 includes a step bottom surface 17a and a step side surface 17b rising from the step bottom surface 17 a. The level difference bottom surface 17a is formed at the same height position as the level difference bottom surface 12a of the peripheral wall level difference portion 12.

The seal 3 is a plate-like member that seals the opening of the jacket main body 2. The seal 3 is sized to be placed on the peripheral wall step portion 12. The plate thickness of the seal 3 is substantially the same as the height of the step side 12 b. A hole portion 4 is formed in the closure 3 at a position corresponding to the pillar 15. The hole 4 is formed so that the projection 16 fits with almost no gap. The closure 3 is formed to contain mainly the second aluminum alloy. The second aluminum alloy is a material having a hardness lower than that of the first aluminum alloy. The second aluminum alloy is formed by, for example, JISA1050, a1100, a6063 or the like aluminum alloy wrought material.

As shown in fig. 2, the mounting step is a step of mounting the seal 3 on the jacket main body 2. In the mounting step, the back surface 3b of the seal 3 is mounted on the step bottom surface 12 a. The step side surface 12b is butted against the outer peripheral side surface 3c of the closure 3 to form a first butted portion J1. The first abutting portion J1 includes both the case where the step side surface 12b is in surface contact with the outer peripheral side surface 3c of the seal 3 and the case where the seal is abutted so as to form a gap having a substantially V-shaped cross section as in the present embodiment. Further, the stepped bottom surface 12a is butted against the back surface 3b of the closure 3 to form a second butted portion J2. In the present embodiment, when the seal 3 is placed, the end surface 11a of the peripheral wall portion 11 is flush with the front surface 3a of the seal 3.

In addition, the hole wall 4a of the hole 4 is butted against the stepped side surface 17b of the pillar stepped portion 17 in the mounting step to form a third butted portion J3. Further, the back surface 3b of the seal 3 is butted against the stepped bottom surface 17a of the pillar stepped portion 17 to form a fourth butted portion J4.

As shown in fig. 3 and 4, the first main joining step is a step of performing friction stir welding of the first butt joint portion J1 using the rotary tool F. The rotary tool F is composed of a coupling portion F1 and a stirring pin F2. The rotary tool F is formed of, for example, tool steel. The connection portion F1 is a portion connected to a rotating shaft of a friction stir device (not shown). The coupling portion F1 has a cylindrical shape and is formed with a screw hole (not shown) to which a bolt is fastened.

The stirring pin F2 is suspended from the coupling portion F1 and is coaxial with the coupling portion F1. The stirring pin F2 has a tapered tip as it goes away from the coupling portion F1. As shown in fig. 4, a flat surface F3 perpendicular to the rotation center axis C and flat is formed at the tip of the stirring pin F2. That is, the outer surface of the stirring pin F2 is constituted by an outer peripheral surface tapered at the tip end and a flat surface F3 formed at the tip end. In the side view, the inclination angle α of the rotation center axis C and the outer peripheral surface of the stirring pin F2 may be appropriately set within a range of, for example, 5 ° to 30 °, but is set to be the same as the inclination angle β of the level difference side surface 12b of the peripheral wall level difference portion 12 in the present embodiment.

A spiral groove is engraved on the outer peripheral surface of the stirring pin F2. In the present embodiment, since the rotary tool F is rotated rightward, the spiral groove is formed to be wound leftward from the base end toward the tip end. In other words, the spiral groove is formed to be wound leftward when viewed from above when the spiral groove is drawn from the base end toward the tip end.

Further, when the rotary tool F is rotated to the left, the spiral groove is preferably formed to be wound to the right from the base end toward the tip end. In other words, the spiral groove at this time is formed to be wound rightward when viewed from above when the spiral groove is drawn from the base end toward the tip end. By setting the spiral groove in the above manner, the plastically fluidized metal is guided by the spiral groove toward the leading end side of the stirring pin F2 when friction stirring is performed. Thereby, the amount of metal that overflows to the outside of the joined metal members (the jacket main body 2 and the closure 3) can be reduced.

As shown in fig. 3, when friction stirring is performed using the rotary tool F, only the stirring pin F2 that rotates to the right is inserted into the closure 3, and the stirring pin F2 is moved while separating the closure 3 from the coupling portion F1. In other words, the friction stirring is performed with the base end portion of the stirring pin F2 exposed. A plasticized region W1 is formed on the moving locus of the rotary tool F due to solidification of the metal after the friction stirring. In the present embodiment, the stirring pin F2 is inserted at the start position Sp set at the closure 3, and the rotating tool F is relatively moved so as to be rotated rightward with respect to the closure 3.

As shown in fig. 4, in the first main joining step, only the stirring pin F2 is brought into contact with only the closures 3 and rotated once along the first butt portion J1. In the present embodiment, the insertion depth is set so that the flat surface F3 of the stirring pin F2 does not contact the sleeve main body 2. The "state where only the stirring pin F2 is in contact with only the closure 3" means a state where the outer surface of the stirring pin F2 is not in contact with the jacket main body 2 at the time of friction stirring, and includes a case where the distance between the outer peripheral surface of the stirring pin F2 and the step side surface 12b is zero, and a case where the distance between the flat surface F3 of the stirring pin F2 and the step bottom surface 12a is zero.

When the distance from the stepped side surface 12b to the outer peripheral surface of the stirring pin F2 is too long, the bonding strength of the first butting portion J1 is reduced. The distance L from the step side surface 12b to the outer peripheral surface of the stirring pin F2 may be appropriately set according to the material of the jacket main body 2 and the seal 3, but it is preferable to set 0. ltoreq.l.ltoreq.0.5 mm, and more preferably 0. ltoreq.l.ltoreq.0.3 mm, for example, when the outer peripheral surface of the stirring pin F2 is not brought into contact with the step side surface 12b and the flat surface F3 is not brought into contact with the step bottom surface 12a as in the present embodiment.

After rotating the rotating tool F one revolution around the closure 3, the beginning and the end of the plasticized region W1 are brought into coincidence. The rotating tool F can also be extracted by gradually raising it in the front face 3a of the closure 3. Fig. 5 is a sectional view of the joined portion after the main joining step of the present embodiment. A plasticized region W1 is formed on the closure 3 side, bounded by the first butt J1. Further, the flat surface F3 of the stirring pin F2 does not contact the stepped bottom surface 12a (see fig. 4), and the plasticized region W1 is formed to exceed the second butting portion J2 and reach the jacket main body 2.

As shown in fig. 6 and 7, the second main joining step is a step of friction stir joining the third butting portion J3 using the rotary tool F. As shown in fig. 6, in the second main joining step, only the stirring pin F2 that rotates rightward is inserted to the start position Sp set on the front surface 3a of the seal 3, and the stirring pin F2 is moved while separating the seal 3 from the coupling portion F1. In other words, the friction stirring is performed with the base end portion of the stirring pin F2 exposed. A plasticized region W2 is formed in the start locus of the rotary tool F due to solidification of the metal after the friction stirring.

As shown in fig. 7, in the second primary welding step, the rotary tool F is relatively moved along the third butting portion J3 in a state where the outer peripheral surface of the stirring pin F2 slightly contacts the stepped side surface 17b (protruding portion 16) of the pillar stepped portion 17. After the rotating tool F is rotated once around the projection 16, the beginning and the end of the plasticized region W2 are made to coincide. Although the flat face F3 of the stirring pin F2 does not contact the level difference bottom face 17a, the plasticized region W2 is formed to reach the fourth butt portion J4.

According to the method for manufacturing the liquid-cooled jacket of the present embodiment described above, the stirring pin F2 of the rotary tool F does not contact the step side surface 12b of the peripheral wall step portion 12, but the second aluminum alloy on the main seal 3 side of the first butt joint portion J1 is stirred by the frictional heat of the seal 3 and the stirring pin F2 to be plastically fluidized, so that the step side surface 12b and the outer peripheral side surface 3c of the seal 3 can be joined at the first butt joint portion J1. Further, friction stirring is performed by bringing only the stirring pin F2 into contact with only the seal 3, and therefore, the first aluminum alloy hardly enters the seal 3 from the jacket main body 2. Thus, the second aluminum alloy mainly on the side of the seal 3 is friction-stirred at the first butt joint portion J1, and therefore, a decrease in the joining strength can be suppressed.

In the first primary welding step, since the step side surface 12b of the jacket main body 2 is inclined outward, the contact of the stirring pin F2 with the jacket main body 2 can be easily avoided. In the present embodiment, the inclination angle β of the step side surface 12b is made equal to the inclination angle α of the stirring pin F2 (the step side surface 12b is made parallel to the outer peripheral surface of the stirring pin F2), so that the stirring pin F2 can be made as close as possible to the step side surface 12b while avoiding contact between the stirring pin F2 and the step side surface 12 b.

Further, in the first main joining step, friction stir joining is performed by bringing only the stirring pin F2 into contact with only the closure 3, and therefore, it is possible to eliminate imbalance of the material resistance received by the stirring pin F2 at one side and the other side of the rotation center axis C of the stirring pin F2. This makes it possible to suppress a decrease in the bonding strength because the plastic fluidizing material is friction-stirred with a high balance.

In the first primary welding step, the rotation direction and the advancing direction of the rotary tool F may be appropriately set, but the rotation direction and the advancing direction of the rotary tool F are set so that the sleeve body 2 side and the seal 3 side in the plasticized region W1 formed in the movement locus of the rotary tool F are set to be the shear side and the flow side, respectively. By setting the sleeve body 2 side to be the shearing side, the stirring action of the stirring pin F2 around the first butt joint portion J1 is increased, and the step side surface 12b and the outer peripheral side surface 3c of the closure 3 can be more reliably joined at the first butt joint portion J1 in anticipation of a temperature rise at the first butt joint portion J1.

The shear side (Advancing side) is a side where the relative speed of the outer periphery of the rotating tool with respect to the engaged portion is a value obtained by adding the magnitude of the moving speed to the magnitude of the tangential speed at the outer periphery of the rotating tool. On the other hand, the flow side (Retreating side) means a side where the relative speed of the rotary tool with respect to the engaged portion is lowered by rotating the rotary tool in the direction opposite to the moving direction of the rotary tool.

Further, the first aluminum alloy of the jacket main body 2 is a material having a higher hardness than the second aluminum alloy of the closure 3. This can improve the durability of the liquid-cooled jacket 1. Preferably, the first aluminum alloy of the jacket main body 2 is an aluminum alloy cast material, and the second aluminum alloy of the seal 3 is an aluminum alloy expanded material. By using the first aluminum alloy as an Al — Si — Cu series aluminum alloy casting material such as JISH5302ADC12, for example, the castability, strength, machinability, and the like of the jacket main body 2 can be improved. Further, by setting the second aluminum alloy to, for example, JISA1000 series or a6000 series, workability and thermal conductivity can be improved.

In the present embodiment, the flat surface F3 of the stirring pin F2 is not inserted deeper than the level difference bottom surface 12a at the first butt joint portion J1, but the plasticized region W1 reaches the second butt joint portion J2, so that the joint strength can be improved.

Further, at the third butting portion J3, only the stirring pin F2 is held in slight contact with the step difference side surface 17b (protruding portion 16) of the pillar step portion 17. Thus, at the third butting portion J3, the first aluminum alloy can be prevented from being mixed into the seal 3 from the pillar 15 of the sleeve main body 2 as much as possible, and the second aluminum alloy mainly on the side of the seal 3 is friction-stirred, so that the reduction of the bonding strength can be suppressed. Further, the strength of the liquid-cooled jacket can be improved by joining the stay 15 to the closing member 3.

In addition, either the first primary bonding step or the second primary bonding step may be performed first. Before the first primary joining step and the second primary joining step are performed, at least one of the first butting portion J1 and the third butting portion J3 may be temporarily joined by friction stir welding or welding. By performing the temporary joining, the first butting portion J1 and the third butting portion J3 can be prevented from being cracked in the first primary joining process or the second primary joining process.

[ first modification ]

Next, a first modification of the first embodiment will be described. As in the first modification shown in fig. 8, the plate thickness of the seal 3 may be set to be larger than the height of the level difference side surface 12b of the peripheral wall level difference portion 12. Since the first butting portion J1 is formed with a gap, there is a possibility that the metal shortage will occur at the butting portion, but the metal shortage can be compensated for by setting as in the first modification.

[ second modification ]

Next, a second modification of the first embodiment will be described. As in the second modification shown in fig. 9, the inclined surface may be provided so as to incline the outer peripheral side surface 3c of the closure 3. The outer peripheral side surface 3c is inclined outward from the rear surface 3b toward the front surface 3 a. The inclination angle γ of the outer peripheral side surface 3c is the same as the inclination angle β of the step side surface 12 b. Thus, in the mounting step, the step side surface 12b is brought into surface contact with the outer peripheral side surface 3c of the seal 3. According to the second modification, since there is no gap at the first butting portion J1, it is possible to make up for the shortage of metal at the joint portion.

[ second embodiment ]

Next, a method for manufacturing a liquid-cooled jacket according to a second embodiment of the present invention will be described. In the method of manufacturing a liquid-cooled jacket according to the second embodiment, a preparation step, a mounting step, a first primary bonding step, and a second primary bonding step are performed. In the second embodiment, the preparation step, the mounting step, and the second primary bonding step are the same as those in the first embodiment, and therefore, the description thereof is omitted. In the second embodiment, a description will be given mainly on a portion different from the first embodiment.

As shown in fig. 10, the first main joining step is a step of friction stir joining the first butt joint portion J1 using a rotary tool F. In the primary joining step, when the stirring pin F2 is moved relatively along the first butting portion J1, friction stir joining is performed such that the outer peripheral surface of the stirring pin F2 slightly contacts the level difference side surface 12b of the peripheral wall level difference portion 12 and the flat surface F3 does not contact the level difference bottom surface 12 a.

Here, the contact amount between the outer peripheral surface of the stirring pin F2 and the level difference side surface 12b is set as the offset amount N. In the case where the outer peripheral surface of the stirring pin F2 is brought into contact with the level difference side surface 12b and the flat surface F3 of the stirring pin F2 is not brought into contact with the level difference bottom surface 12a as in the present embodiment, the offset N is set to 0 < N.ltoreq.0.5 mm, more preferably 0 < N.ltoreq.0.25 mm.

In the conventional method of manufacturing a liquid-cooled jacket shown in fig. 41, since the jacket main body 101 and the seal 102 have different hardnesses, the material resistance received by the stirring pin F2 greatly differs between one side and the other side with respect to the rotation center axis C. Therefore, the plastic fluidizing material is not stirred with a high balance, and this causes a reduction in the bonding strength. However, according to the present embodiment, the amount of contact between the outer peripheral surface of the agitating pin F2 and the sleeve main body 2 is reduced as much as possible, and therefore, the material resistance that the agitating pin F2 receives from the sleeve main body 2 can be reduced as much as possible. In the present embodiment, the inclination angle β of the level difference side surface 12b of the peripheral wall level difference portion 12 is made equal to the inclination angle α of the stirring pin F2 (the level difference side surface 12b is made parallel to the outer peripheral surface of the stirring pin F2), so that the contact amount between the stirring pin F2 and the level difference side surface 12b can be made uniform in the height direction. Thus, in the present embodiment, the plastic fluidizing material is stirred with a high balance, and therefore, the strength of the joined portion can be suppressed from being lowered.

In the second embodiment, the plate thickness of the seal 3 may be increased or inclined surfaces may be provided on the side surfaces as in the first and second modifications of the first embodiment. In the second primary welding step, a fifth embodiment, a first modification of the fifth embodiment, or a sixth embodiment, which will be described later, may be applied.

[ third embodiment ]

Next, a method for manufacturing a liquid-cooled jacket according to a third embodiment of the present invention will be described. In the method of manufacturing a liquid-cooled jacket according to the third embodiment, a preparation step, a mounting step, a first primary bonding step, and a second primary bonding step are performed. In the third embodiment, the preparation step, the mounting step, and the second primary bonding step are the same as those in the first embodiment, and therefore, the description thereof is omitted. In the third embodiment, a description will be given mainly on a portion different from the first embodiment.

As shown in fig. 11, the first primary welding step is a step of friction stir welding the sleeve body 2 and the seal 3 using a rotary tool F. In the primary joining step, when the stirring pin F2 is moved relatively along the first butting portion J1, friction stir joining is performed in a state where the outer peripheral surface of the stirring pin F2 is not in contact with the step side surface 12b and the flat surface F3 is inserted deeper than the step bottom surface 12 a.

According to the method of manufacturing the liquid cooling jacket of the present embodiment, the stirring pin F2 is not in contact with the level difference side surface 12b of the peripheral wall level difference portion 12, but the second aluminum alloy on the main seal 3 side of the first butt joint portion J1 is stirred and plastically fluidized by the frictional heat of the seal 3 and the stirring pin F2, so that the level difference side surface 12b and the outer peripheral side surface 3c of the seal 3 can be joined at the first butt joint portion J1. Further, friction stirring is performed by bringing only the stirring pin F2 into contact with only the closure 3 at the first butt portion J1, and therefore, the first aluminum alloy hardly enters the closure 3 from the jacket main body 2. Thus, the second aluminum alloy mainly on the side of the seal 3 is friction-stirred at the first butt joint portion J1, and therefore, a decrease in the joining strength can be suppressed.

Further, since the step side surface 12b of the jacket main body 2 is inclined outward, the contact of the stirring pin F2 with the step side surface 12b can be easily avoided. In the present embodiment, the inclination angle β of the step side surface 12b is made equal to the inclination angle α of the stirring pin F2 (the step side surface 12b is made parallel to the outer peripheral surface of the stirring pin F2), so that the stirring pin F2 can be made as close to the step side surface 12b as possible while avoiding contact between the stirring pin F2 and the step side surface 12 b.

Further, since the outer peripheral surface of the stirring pin F2 is separated from the step side surface 12b to be friction stir welded, the imbalance of the material resistance received by the stirring pin F2 on one side and the other side of the rotation center axis C of the stirring pin F2 can be reduced. This makes it possible to suppress a decrease in the bonding strength because the plastic fluidizing material is friction-stirred with a high balance. Preferably, as in the present embodiment, when the outer peripheral surface of the stirring pin F2 is not brought into contact with the step side surface 12b and the flat surface F3 is inserted deeper than the step bottom surface 12a, the distance L from the step side surface 12b to the outer peripheral surface of the stirring pin F2 is set to, for example, 0. ltoreq. l.ltoreq.0.5 mm, more preferably 0. ltoreq. l.ltoreq.0.3 mm.

Further, by inserting the flat surface F3 of the stirring pin F2 into the stepped bottom surface 12a, the lower portion of the joint portion can be more reliably friction-stirred. This can prevent the occurrence of void defects and the like in the plasticized region W1, and can improve the bonding strength. Further, the entire surface of the flat surface F3 of the stirring pin F2 is located closer to the center side of the closure 3 than the outer peripheral side surface 3c of the closure 3. This can increase the joining area of the second butt joint portion J2, and therefore can improve the joining strength.

In the third embodiment, the plate thickness of the seal 3 may be increased or the outer peripheral side surface may be provided with an inclined surface as in the first and second modifications of the first embodiment. In the second primary welding step, a fifth embodiment, a first modification of the fifth embodiment, or a sixth embodiment, which will be described later, may be applied.

[ fourth embodiment ]

Next, a method for manufacturing a liquid-cooled jacket according to a fourth embodiment of the present invention will be described. In the method of manufacturing a liquid-cooled jacket according to the fourth embodiment, a preparation step, a mounting step, a first primary bonding step, and a second primary bonding step are performed. In the fourth embodiment, the preparation step, the mounting step, and the second primary bonding step are the same as those in the first embodiment, and therefore, the description thereof is omitted. In the fourth embodiment, a description will be given centering on a portion different from the third embodiment.

As shown in fig. 12, the first main joining step is a step of friction stir joining the first butt joint portion J1 using a rotary tool F. In the primary joining step, when the stirring pin F2 is moved relatively along the first butting portion J1, friction stir joining is performed such that the outer peripheral surface of the stirring pin F2 slightly contacts the level difference side surface 12b of the peripheral wall level difference portion 12 and the flat surface F3 is inserted deeper than the level difference bottom surface 12 a.

Here, the contact amount between the outer peripheral surface of the stirring pin F2 and the level difference side surface 12b is set as the offset amount N. In the case where the flat surface F3 of the stirring pin F2 is inserted deeper than the level difference bottom surface 12a of the peripheral wall level difference portion 12 and the outer peripheral surface of the stirring pin F2 is brought into contact with the level difference side surface 12b as in the present embodiment, the offset N is set to 0 < N.ltoreq.1.0 mm, preferably 0 < N.ltoreq.0.85 mm, and more preferably 0 < N.ltoreq.0.65 mm.

In the conventional method of manufacturing a liquid-cooled jacket shown in fig. 41, since the jacket main body 101 and the seal 102 have different hardnesses, the material resistance received by the stirring pin F2 is greatly different between the one side and the other side with respect to the rotation center axis C. Therefore, the plastic fluidizing material is not stirred with a high balance, and this causes a reduction in the bonding strength. However, according to the present embodiment, the amount of contact between the outer peripheral surface of the agitating pin F2 and the sleeve main body 2 is reduced as much as possible, and therefore, the material resistance that the agitating pin F2 receives from the sleeve main body 2 can be reduced as much as possible. In the present embodiment, the inclination angle β of the step side surface 12b is made equal to the inclination angle α of the stirring pin F2 (the step side surface 12b is made parallel to the outer peripheral surface of the stirring pin F2), and therefore the contact amount between the stirring pin F2 and the step side surface 12b can be made uniform in the height direction. Thus, in the present embodiment, the plastic fluidizing material is stirred with a high balance, and therefore, the strength of the joined portion can be suppressed from being lowered.

Further, by inserting the flat surface F3 of the stirring pin F2 into the stepped bottom surface 12a, the lower portion of the joint portion can be more reliably friction-stirred. This can prevent the occurrence of void defects and the like in the plasticized region W1, and can improve the bonding strength. That is, both the first docking portion J1 and the second docking portion J2 can be securely engaged.

In the fourth embodiment, the plate thickness of the seal 3 may be increased or inclined surfaces may be provided on the side surfaces as in the first and second modifications of the first embodiment. In the second primary welding step, a fifth embodiment, a first modification of the fifth embodiment, or a sixth embodiment, which will be described later, may be applied.

[ first modification of the fourth embodiment ]

Next, a first modification of the fourth embodiment will be described. As shown in fig. 13, the first modification differs from the fourth embodiment in that a rotary tool FA is used. In this modification, a description will be given centering on a portion different from the fourth embodiment.

The rotary tool FA used in the primary joining step includes a coupling portion F1 and a stirring pin F2. The stirring pin F2 includes a flat surface F3 and a protrusion F4. The protrusion F4 protrudes downward from the flat surface F3. The shape of the projection F4 is not limited, but is cylindrical in the present embodiment. The side surface of the protrusion F4 and the flat surface F3 form a step portion.

In the primary bonding step of the first modification, the tip of the rotary tool FA is inserted deeper than the step bottom surface 12 a. Thereby, the plastic fluidized material which is friction-stirred along the projection F4 and is wound up at the projection F4 is pressed by the flat surface F3. This makes it possible to more reliably friction stir the periphery of the protrusion F4 and reliably cut off the oxide film of the second butt joint portion J2. This can improve the joining strength of the second butt joint portion J2. Further, by setting only the projection portion F4 to be inserted deeper than the second butt joint portion J2 as in the present modification, the width of the plasticized region W1 can be reduced as compared with the case where the flat surface F3 is inserted deeper than the second butt joint portion J2. This prevents the plastic fluidizing material from flowing out to the recessed portion 13, and the width of the step bottom surface 12a can be set small.

In the first modification of the fourth embodiment shown in fig. 13, the projection F4 (the tip of the stirring pin F2) is inserted deeper than the second abutting portion J2, but the flat surface F3 may be inserted deeper than the second abutting portion J2.

[ fifth embodiment ]

Next, a method for manufacturing a liquid cooling jacket according to a fifth embodiment will be described. In the method of manufacturing a liquid cooling jacket according to the fifth embodiment, a preparation step, a mounting step, a first primary bonding step, and a second primary bonding step are performed. In the fifth embodiment, the preparation step, the placement step, and the first primary bonding step are the same as those in the first embodiment, and therefore, the description thereof is omitted. In the fifth embodiment, a description will be given mainly on a portion different from the first embodiment.

As shown in fig. 14, in the second primary welding step, the rotary tool F is rotated once around the third butting portion J3 without contacting the support column 15 and the projecting portion 16, and friction stir welding is performed. In the second primary welding step, although the friction stir welding is performed without bringing the stir pin F2 into contact with either the step side surface 17b or the step bottom surface 17a of the pillar step 17, the insertion depth of the stir pin F2 is set so that the plasticized region W2 reaches the fourth butt portion J4. That is, the fourth butt portion J4 is plastically fluidized by the frictional heat of the agitation pin F2 and the closure 3 to be joined. The insertion depth may be set so that the stirring pin F2 contacts the stepped bottom surface 17a of the pillar stepped portion 17.

[ first modification of the fifth embodiment ]

Next, a method for manufacturing a liquid-cooled jacket according to a first modification of the fifth embodiment will be described. In the method of manufacturing a liquid-cooled jacket according to the first modification of the fifth embodiment, a preparation step, a mounting step, a first primary welding step, and a second primary welding step are performed. This modification is different from the fifth embodiment in that a rotary tool FA is used in the second primary welding step.

As shown in fig. 15, in the second primary welding step, the rotary tool FA is rotated once around the third butting portion J3 so as to perform friction stir welding without contacting the rotary tool FA with the step side surface 17b (the protruding portion 16). In the second primary welding step, the tip of the rotary tool FA is inserted deeper than the step bottom surface 17a of the pillar step 17. Thereby, the plastic fluidized material which is friction-stirred along the projection F4 and is wound up at the projection F4 is pressed by the flat surface F3. This makes it possible to more reliably friction stir the periphery of the protrusion F4 and reliably cut off the oxide film of the fourth butt portion J4. This can improve the joint strength of the fourth butting portion J4. Further, by setting only the projection portion F4 to be inserted deeper than the fourth butt portion J4 as in the present modification, the width of the plasticized region W2 can be reduced as compared with the case where the flat surface F3 is inserted deeper than the fourth butt portion J4. This prevents the plastic fluidizing material from flowing out to the recessed portion 13, and the width of the step bottom surface 17a of the pillar step portion 17 can be set small.

In the first modification of the fifth embodiment shown in fig. 15, the projection F4 (the tip of the stirring pin F2) is inserted deeper than the fourth butt portion J4, but the flat surface F3 may be inserted deeper than the fourth butt portion J4.

[ sixth embodiment ]

Next, a method for manufacturing a liquid-cooled jacket according to a sixth embodiment will be described. In the method of manufacturing a liquid-cooled jacket according to the sixth embodiment, a preparation step, a mounting step, a first primary bonding step, and a second primary bonding step are performed. In the sixth embodiment, the preparation step, the placement step, and the first primary bonding step are the same as those in the first embodiment, and therefore, the description thereof is omitted.

As shown in fig. 16, in the second primary welding step, the friction stir welding is performed on the third butting portion J3 with the rotary tool F tilted outward with respect to the protruding portion 16. In the second primary welding step, the friction stir welding is performed in a state where the rotation center axis C of the rotary tool F is inclined outward at an angle α with respect to the protruding portion 16. Thus, the outer peripheral surface of the stirring pin F2 is parallel to the stepped side surface 17b of the pillar stepped portion 17. The stepped surface 17b may be separated from the stirring pin F2, or may be slightly in contact with the stirring pin F2.

In the method of manufacturing the liquid-cooled jacket according to the sixth embodiment, since the friction stirring can be performed in a state where the outer peripheral surface of the stirring pin F2 is parallel to the step side surface 17b, the rotary tool F and the protruding portion 16 can be brought as close as possible while the step side surface 17b and the outer peripheral surface of the stirring pin F2 are separated. This can prevent the first aluminum alloy from entering from the jacket main body 2 side to the seal 3 side, and can improve the joining strength. On the other hand, if the level difference side surface 17b is slightly brought into contact with the stirring pin F2, the first aluminum alloy can be prevented from being mixed from the jacket main body 2 side toward the closure 3 side as much as possible, and the level difference side surface 17b can be brought into uniform contact with the stirring pin F2 in the height direction. The stirring pin F2 may be in contact with the stepped bottom surface 17 a.

[ third modification of the first embodiment ]

Next, a method for manufacturing a liquid-cooled jacket according to a third modification of the first embodiment will be described. As shown in fig. 17, the third modification differs from the first embodiment in that the temporary bonding step, the first primary bonding step, and the second primary bonding step are performed using a cooling plate. In a third modification of the first embodiment, a description will be given mainly of a portion different from the first embodiment.

As shown in fig. 17, in the third modification of the first embodiment, the cover main body 2 is fixed to the table K in the fixing step. The table K includes a rectangular parallelepiped base plate K1, clips K3 formed at four corners of the base plate K1, and cooling pipes WP arranged inside the base plate K1. The table K restricts the jacket main body 2 from moving and functions as a "cooling plate" in the claims.

The cooling pipe WP is a tubular member buried inside the substrate K1. A cooling medium for cooling substrate K1 flows through cooling pipe WP. The position where the cooling pipe WP is disposed, that is, the shape of the cooling flow path through which the cooling medium flows is not particularly limited, but in the third modification, the cooling pipe WP has a planar shape along the movement locus of the rotary tool F in the first primary welding step. That is, the cooling pipe WP is disposed so as to substantially overlap the first butting portion J1 in a plan view.

In the temporary joining step, the first primary joining step, and the second primary joining step of the third modification, after the jacket main body 2 is fixed to the table K, friction stir welding is performed while a cooling medium is caused to flow through the cooling pipe WP. This can suppress the frictional heat during friction stirring to a low level, and thus can reduce the deformation of the liquid cooling jacket 1 due to thermal shrinkage. In the third modification, since the cooling flow path overlaps the first butting portion J1 (the movement locus of the temporary joining rotary tool and the rotary tool F) in a plan view, the portion where frictional heat is generated can be intensively cooled. This can improve the cooling efficiency. Further, since the cooling pipe WP is provided to allow the cooling medium to flow therethrough, management of the cooling medium is facilitated. Further, since the table K (cooling plate) is in surface contact with the jacket main body 2, the cooling efficiency can be improved.

Further, the friction stir welding may be performed while cooling the jacket main body 2 and the seal 3 by using the table K (cooling plate) and flowing a cooling medium inside the jacket main body 2.

[ fourth modification of the first embodiment ]

Next, a method for manufacturing a liquid-cooled jacket according to a fourth modification of the first embodiment will be described. As shown in fig. 18A and 18B, the fourth modification of the first embodiment differs from the first embodiment in that the first primary welding step and the second primary welding step are performed in a state in which the front surface side of the jacket main body 2 and the front surface 3a of the seal 3 are convexly curved. In the fourth modification, a description will be given centering on a portion different from the first embodiment.

As shown in fig. 18A and 18B, in the fourth modification, a table KA is used. The table KA is composed of a rectangular base plate KA1, a spacer KA2 formed at the center of the base plate KA1, and clips KA3 formed at the four corners of the base plate KA 1. The spacer KA2 may be integral with the base plate KA1 or may be separate.

In the fixing step of the fourth modification, the cap body 2 and the seal 3 integrated by the temporary joining step are fixed to the table KA by the clip KA 3. The plasticized region W is formed by the temporary bonding process. As shown in fig. 18A, when the jacket main body 2 and the seal 3 are fixed to the table KA, the bottom portion 10, the end surface 11a, and the front surface 3a of the seal 3 of the jacket main body 2 are curved so as to protrude upward. More specifically, the first side portion 21 of the wall portion 11A, the second side portion 22 of the wall portion 11B, the third side portion 23 of the wall portion 11C, and the fourth side portion 24 of the wall portion 11D of the cover main body 2 are curved.

In the first primary welding step and the second primary welding step of the fourth modification, friction stir welding is performed using a rotary tool F. In the first primary welding step and the second primary welding step, the amount of deformation of at least one of the jacket main body 2 and the seal 3 is measured in advance, and friction stir welding is performed while adjusting the insertion depth of the stirring pin F2 based on the amount of deformation. That is, the rotary tool F is moved along the curved surface of the end surface 11a of the sleeve body 2 and the front surface 3a of the seal 3 so that the movement locus thereof is curved. In this way, the depth and width of the plasticized regions W1 and W2 can be made constant.

The heat shrinkage occurs in the plasticized regions W1 and W2 due to the heat input of the friction stir welding, and the seal 3 side of the liquid-cooled jacket 1 may be deformed into a concave shape, but according to the first primary welding step and the second primary welding step of the fourth modification, the sleeve body 2 and the seal 3 are fixed in advance in a convex shape, so that the tensile stress acts on the end surface 11a and the front surface 3a, and therefore, the liquid-cooled jacket 1 can be flattened by the heat shrinkage after the friction stir welding. Further, in the case where the primary joining step is performed by a conventional rotary tool, if the sleeve body 2 and the seal 3 are warped in a convex shape, the shoulder of the rotary tool comes into contact with the sleeve body 2 and the seal 3, and the workability is poor. However, according to the fourth modification, the rotary tool F does not have a shaft shoulder portion, and therefore, even when the sleeve body 2 and the seal 3 are warped in a convex shape, the operability of the rotary tool F is good.

In addition, a known height detecting device may be used to measure the amount of deformation of the sleeve body 2 and the seal 3. Further, for example, a friction stir welding apparatus equipped with a detection device that detects the height from the table KA to at least one of the jacket main body 2 and the seal 3 may be used to perform the first primary welding step and the second primary welding step while detecting the amount of deformation of the jacket main body 2 or the seal 3.

In the fourth modification, the case main body 2 and the seal 3 are bent so that all of the first side portion 21 to the fourth side portion 24 are curved, but the present invention is not limited thereto. For example, the cover main body 2 and the seal 3 may be bent so that the first side portion 21 and the second side portion 22 are straight lines and the third side portion 23 and the fourth side portion 24 are curved lines. For example, the cover main body 2 and the seal 3 may be bent so that the first side portion 21 and the second side portion 22 are curved and the third side portion 23 and the fourth side portion 24 are linear.

In the fourth modification, the height position of the stirring pin F2 is changed according to the amount of deformation of the jacket main body 2 or the seal 3, but the main joining step may be performed by fixing the height of the stirring pin F2 with respect to the table KA.

The spacer KA2 may have any shape as long as it can be fixed so that the front surfaces of the cover main body 2 and the seal 3 are convex. The spacer KA2 may be omitted as long as the front surfaces of the cover main body 2 and the seal 3 can be fixed in a convex shape. The rotary tool F may be attached to a robot arm having a rotary drive mechanism such as a spindle unit at the tip, for example. According to the above configuration, the rotation center axis of the rotary tool F can be easily changed at various angles.

[ fifth modification of the first embodiment ]

Next, a method for manufacturing a liquid-cooled jacket according to a fifth modification of the first embodiment will be described. As shown in fig. 19, a fifth modification of the first embodiment differs from the first embodiment in that the jacket main body 2 and the seal 3 are formed to be previously bent in a convex shape toward the front side in the preparatory step. A fifth modification of the first embodiment will be described centering on differences from the first embodiment.

In a preparation step of a fifth modification of the first embodiment, the front surfaces of the jacket main body 2 and the seal 3 are formed by a mold so as to be curved in a convex shape. Thus, the cover main body 2 is formed such that the bottom portion 10 and the peripheral wall portion 11 are convex on the front side. Further, the front face 3a of the closure 3 is formed in a convex shape.

As shown in fig. 20, in the fifth modification, the temporarily joined jacket main body 2 and seal 3 are fixed to the table KB in the fixing step. The table KB includes a rectangular base KB1, a spacer KB2 disposed at the center of the base KB1, clips KB3 formed at the four corners of the base KB1, and cooling pipes WP buried inside the base KB 1. The table KB restricts the jacket main body 2 from moving and is a member that functions as a "cooling plate" in the claims.

The spacer KB2 includes a curved surface KB2a curved in a convex shape upward, and upright surfaces KB2b and KB2b formed at both ends of the curved surface KB2a and rising from the base plate KB 1. The first side Ka and the second side KB of the spacer KB2 are curved lines, and the third side Kc and the fourth side Kd are straight lines.

The cooling pipe WP is a tubular member buried inside the substrate KB 1. A cooling medium for cooling the substrate KB1 flows through the cooling pipe WP. The position where the cooling pipe WP is disposed, that is, the shape of the cooling flow path through which the cooling medium flows is not particularly limited, but in the fifth modification, the cooling pipe WP has a planar shape along the movement locus of the rotary tool F in the first primary welding step. That is, the cooling pipe WP is disposed so as to substantially overlap the first butting portion J1 in a plan view.

In the fixing step of the fifth modification, the temporarily joined and integrated cap body 2 and seal 3 are fixed to the table KB by the clip KB 3. More specifically, the back surface of the bottom portion 10 of the jacket main body 2 is fixed to the table KB so as to be in surface contact with the curved surface KB2 a. When the cover main body 2 is fixed to the table KB, the first side portion 21 of the wall portion 11A and the second side portion 22 of the wall portion 11B of the cover main body 2 are curved, and the third side portion 23 of the wall portion 11C and the fourth side portion 24 of the wall portion 11D are curved so as to be linear.

In the first primary welding step and the second primary welding step of the fifth modification, the first butt joint portion J1 and the second butt joint portion J2 are friction stir welded, respectively, using the rotary tool F. In the first primary welding step and the second primary welding step, the amount of deformation of at least one of the jacket main body 2 and the seal 3 is measured in advance, and friction stir welding is performed while adjusting the insertion depth of the stirring pin F2 based on the amount of deformation. That is, the rotary tool F is moved along the end surface 11a of the sleeve body 2 and the front surface 3a of the seal 3 so that the movement locus thereof is curved or linear. In this way, the depth and width of the plasticized region W1 can be made constant.

The heat shrinkage occurs in the plasticized regions W1 and W2 due to the heat input of the friction stir welding, and the seal 3 side of the liquid-cooled jacket 1 may be deformed into a concave shape, but according to the first primary welding step and the second primary welding step of the fifth modification, the jacket main body 2 and the seal 3 are formed into a convex shape in advance, and therefore, the liquid-cooled jacket 1 can be flattened by the heat shrinkage after the friction stir welding.

In the fifth modification, the curved surface KB2a of the spacer KB2 is in surface contact with the concave back surface of the bottom 10 of the cover main body 2. This enables friction stir welding to be performed while more efficiently cooling the jacket main body 2 and the seal 3. Since the frictional heat during friction stir welding can be kept low, the deformation of the liquid-cooled jacket due to thermal shrinkage can be reduced. Thus, in the preparation step, when the cover main body 2 and the seal 3 are formed in the convex shape, the curvature of the cover main body 2 and the seal 3 can be reduced.

In addition, a known height detecting device may be used to measure the amount of deformation of the sleeve body 2 and the seal 3. Further, for example, the main joining step may be performed while detecting the deformation amount of the jacket main body 2 or the seal 3 using a friction stir welding apparatus equipped with a detection device that detects the height from the table KB to at least one of the jacket main body 2 and the seal 3.

In the fifth modification, the case main body 2 and the seal 3 are bent so that the first side portion 21 and the second side portion 22 are curved, but the present invention is not limited thereto. For example, the spacer KB2 having a spherical surface may be formed so that the back surface of the bottom portion 10 of the jacket main body 2 is in surface contact with the spherical surface. In the above case, if the jacket main body 2 is fixed to the table KB, all of the first side 21 to the fourth side 24 are curved.

In the fifth modification, the height position of the stirring pin F2 is changed according to the amount of deformation of the jacket main body 2 or the seal 3, but the main joining step may be performed with the stirring pin F2 at a constant height with respect to the table KB.

[ seventh embodiment ]

A method for manufacturing a liquid cooling jacket according to a seventh embodiment of the present invention will be described in detail with reference to the drawings. As shown in fig. 21, the method for manufacturing a liquid-cooled jacket according to the present embodiment includes a preparation step, a mounting step, a first primary bonding step, and a second primary bonding step. The preparation step is a step of preparing the sleeve body 2 and the seal 3. The jacket main body 2 is mainly composed of a bottom 10, a peripheral wall 11, and a plurality of stays 15.

As shown in fig. 21, the bottom portion 10 is a plate-like member having a rectangular shape in a plan view. The peripheral wall 11 is a wall rising in a rectangular frame shape from the peripheral edge of the bottom 10. A peripheral wall step portion 12 is formed on the inner peripheral edge of the peripheral wall portion 11. The peripheral wall step portion 12 is composed of a step bottom surface 12a and a step side surface 12b rising from the step bottom surface 12 a. As shown in fig. 22, the level difference side surface 12b is inclined so as to extend outward from the level difference bottom surface 12a toward the opening. The inclination angle β of the step side surface 12b may be appropriately set, and may be, for example, 3 ° to 30 ° with respect to the plumb surface. The recess 13 is formed by the bottom 10 and the peripheral wall 11.

As shown in fig. 21, the pillars 15 stand vertically from the bottom 10. The number of the support columns 15 is not limited, but four support columns are formed in the present embodiment. The shape of the support column 15 is a cylindrical shape in the present embodiment, but may be other shapes. A projection 16 is formed at the front end of the pillar 15. The shape of the protruding portion 16 is not limited, but is a truncated cone shape in the present embodiment. The height of the projection 16 is smaller than the plate thickness of the closure 3. The pillar step 17 is formed by the end surface of the pillar 15 and the protrusion 16. The pillar step 17 includes a step bottom surface 17a and a step side surface 17b rising from the step bottom surface 17 a. The level difference bottom surface 17a is formed at the same height position as the level difference bottom surface 12a of the peripheral wall level difference portion 12. The step side 17b is smaller than the plate thickness of the sealing member 3. The step side 17b is inclined so as to be spaced apart from the hole wall 4a as it goes toward the front end.

The sealing member 3 is a plate-like member that seals the opening of the jacket main body 2. The seal 3 is sized to be placed on the peripheral wall step portion 12. The plate thickness of the closure 3 is greater than the height of the step side 12 b. A hole portion 4 is formed in the closure 3 at a position corresponding to the pillar 15. The hole 4 is formed to fit the protrusion 16. The closure 3 is formed to contain mainly the second aluminum alloy. The second aluminum alloy is a material having a hardness lower than that of the first aluminum alloy. The second aluminum alloy is formed by, for example, JISA1050, a1100, a6063 or the like aluminum alloy wrought material.

As shown in fig. 22, the mounting step is a step of mounting the seal 3 on the jacket main body 2. In the mounting step, the back surface 3b of the seal 3 is mounted on the step bottom surface 12 a. The step side surface 12b is butted against the outer peripheral side surface 3c of the closure 3 to form a first butted portion J1. Further, the stepped bottom surface 12a is butted against the back surface 3b of the closure 3 to form a second butted portion J2.

In addition, the hole wall 4a of the hole 4 is butted against the stepped side surface 17b of the pillar stepped portion 17 in the mounting step to form a third butted portion J3. The third abutting portion J3 includes both the case where the hole wall 4a is in surface contact with the step side surface 17b of the pillar step 17 and the case where the hole wall is abutted so as to form a gap having a substantially V-shaped cross section as in the present embodiment. Further, the back surface 3b of the seal 3 is butted against the stepped bottom surface 17a of the pillar stepped portion 17 to form a fourth butted portion J4. In the present embodiment, the projecting portion 16 is formed to be tapered, but may be formed to be cylindrical. That is, the step side surface 17b of the pillar step 17 may be brought into surface contact with the hole wall 4a of the hole 4, or the step side surface 17b of the pillar step 17 may be opposed to the hole wall 4a of the hole 4 with a slight gap therebetween.

As shown in fig. 23 and 24, the first main joining step is a step of performing friction stir welding of the first butt joint portion J1 using the rotary tool F.

As shown in fig. 24, in the first primary welding step, while the plastically fluidized metal is caused to flow into the gap of the first butt joint portion J1, only the stirring pin F2 is brought into contact with only the closure 3 and rotated once along the first butt joint portion J1.

After rotating the rotating tool F one revolution around the closure 3, the beginning and the end of the plasticized region W1 are brought into coincidence. The rotating tool F can also be extracted by gradually raising it in the front face 3a of the closure 3. Fig. 25 is a sectional view of the joined portion after the main joining step of the present embodiment. A plasticized region W1 is formed on the closure 3 side, bounded by the first butt J1. Further, the flat surface F3 of the stirring pin F2 does not contact the stepped bottom surface 12a (see fig. 24), and the plasticized region W1 is formed to exceed the second butting portion J2 and reach the jacket main body 2.

As shown in fig. 26 and 27, the second main joining step is a step of friction stir joining the third butting portion J3 using the rotary tool F. As shown in fig. 26, in the second main joining step, only the stirring pin F2 that rotates to the right is inserted to the start position Sp set on the front surface 3a of the seal 3, and the stirring pin F2 is moved while separating the seal 3 from the coupling portion F1. In other words, the friction stirring is performed with the base end portion of the stirring pin F2 exposed. A plasticized region W2 is formed on the moving locus of the rotary tool F due to solidification of the metal after the friction stirring.

As shown in fig. 27, in the second primary welding step, while the plastically fluidized metal is caused to flow into the gap of the third butting portion J3, only the stirring pin F2 is brought into contact with only the closure 3 and rotated once along the third butting portion J3. In the present embodiment, the outer peripheral surface F10 of the stirring pin F2 is not in contact with the step side surface 17b of the column step portion 17, and the flat surface F3 of the stirring pin F2 is not in contact with the step bottom surface 17 a. The distance separating the step side surface 17b from the outer peripheral surface F10 of the stirring pin F2 is the same as in the first primary welding step. After the rotating tool F is rotated once around the projection 16, the beginning and the end of the plasticized region W2 are made to coincide. The rotating tool F can also be extracted by gradually raising it in the front face 3a of the closure 3.

According to the method for manufacturing the liquid-cooled jacket of the present embodiment described above, the stirring pin F2 of the rotary tool F does not contact the step side surface 12b of the peripheral wall step portion 12, but the second aluminum alloy on the main seal 3 side of the first butt joint portion J1 is stirred by the frictional heat of the seal 3 and the stirring pin F2 to be plastically fluidized, so that the step side surface 12b and the outer peripheral side surface 3c of the seal 3 can be joined at the first butt joint portion J1. In both the first primary welding step and the second primary welding step, friction stirring is performed by bringing only the stirring pin F2 into contact with only the seal 3, and therefore the first aluminum alloy hardly enters the seal 3 from the jacket main body 2. Thereby, the second aluminum alloy, which is mainly on the closure 3 side, is friction-stirred at the first butting portion J1 and the third butting portion J3, and therefore, a decrease in the joining strength can be suppressed.

In the present embodiment, although the gap having a V-shaped cross section is formed between the first butt joint portion J1 and the third butt joint portion J3, the metal deficiency of the joint portions (plasticized regions W1 and W2) in the first primary joining step and the second primary joining step can be prevented by making the plate thickness of the seal 3 larger than the step side surfaces 12b and 17 b.

In the first primary welding step, since the step side surface 12b of the jacket main body 2 is inclined outward, the contact of the stirring pin F2 with the jacket main body 2 can be easily avoided. In the present embodiment, the inclination angle β of the step side surface 12b is made the same as the inclination angle α of the stirring pin F2 (the step side surface 12b is made parallel to the outer peripheral surface F10 of the stirring pin F2), so that the stirring pin F2 and the step side surface 12b can be made as close as possible while avoiding contact between the stirring pin F2 and the step side surface 12 b.

In the second primary welding step, the stepped side surface 17b of the pillar stepped portion 17 is inclined in a direction away from the hole wall 4a (so as to narrow the distal end of the pillar 15) as it goes toward the distal end, and therefore, the contact of the stirring pin F2 with the jacket main body 2 can be easily avoided. In the present embodiment, the inclination angle γ of the step side surface 17b is made the same as the inclination angle α of the stirring pin F2 (the step side surface 17b is made parallel to the outer peripheral surface F10 of the stirring pin F2), so that the stirring pin F2 and the step side surface 17b can be made as close as possible while avoiding contact between the stirring pin F2 and the step side surface 17 b.

Further, in the first primary joining step and the second primary joining step, friction stir joining is performed by bringing only the stirring pin F2 into contact with only the closure 3, and therefore, imbalance of the material resistance received by the stirring pin F2 on one side and the other side of the rotation center axis C of the stirring pin F2 can be eliminated. This makes it possible to suppress a decrease in the bonding strength because the plastic fluidizing material is friction-stirred with a high balance.

In the first primary welding step, the rotation direction and the advancing direction of the rotary tool F may be appropriately set, but the rotation direction and the advancing direction of the rotary tool F are set so that the sleeve body 2 side and the seal 3 side in the plasticized region W1 formed in the movement locus of the rotary tool F are set to be the shear side and the flow side, respectively. Further, by setting the sleeve body 2 side to be the shearing side, the stirring action of the stirring pin F2 around the first butt joint portion J1 is increased, and the temperature rise at the first butt joint portion J1 can be expected, and the step side surface 12b and the outer peripheral side surface 3c of the closure 3 can be joined more reliably at the first butt joint portion J1.

Similarly, in the second primary welding step, the stirring action of the stirring pin F2 is increased around the third butting portion J3 by setting the pillar (sleeve body 2) side to the shearing side, so that the temperature rise at the third butting portion J3 can be expected and the step side surface 17b and the hole wall 4a of the hole 4 can be more reliably welded at the third butting portion J3.

Further, in the present embodiment, although the flat surface F3 of the stirring pin F2 is not inserted deeper than the level difference bottom surface 12a at the second butt joint portion J2, the joining strength can be improved by making the plasticized region W1 reach the second butt joint portion J2.

In the second primary welding step shown in fig. 27, the outer peripheral surface F10 of the stirring pin F2 may be kept out of contact with the step side surface 17b, and the flat surface F3 of the stirring pin F2 may be brought into contact (slightly brought into contact) with the step bottom surface 17a of the pillar step 17. In this way, the fourth abutting portion J4 can be firmly joined. The step side surface 12b may be formed to be perpendicular to the step bottom surface 12a without being inclined.

[ eighth embodiment ]

Next, a method for manufacturing a liquid-cooled jacket according to an eighth embodiment of the present invention will be described. In the method of manufacturing a liquid-cooled jacket according to the eighth embodiment, a preparation step, a mounting step, a first primary bonding step, and a second primary bonding step are performed. In the eighth embodiment, the preparation step, the mounting step, and the second primary bonding step are the same as those in the seventh embodiment, and therefore, descriptions thereof are omitted. In the eighth embodiment, the description will be focused on the differences from the seventh embodiment.

As shown in fig. 28, the first main joining step is a step of friction stir joining the first butt joint portion J1 using the rotary tool F. In the primary joining step, when the stirring pin F2 is moved relatively along the first butting portion J1, friction stir joining is performed such that the outer peripheral surface F10 of the stirring pin F2 slightly contacts the level difference side surface 12b of the peripheral wall level difference portion 12 and the flat surface F3 does not contact the level difference bottom surface 12 a.

Here, the contact amount between the outer peripheral surface F10 of the stirring pin F2 and the level difference side surface 12b is set as an offset amount N. In the case where the outer peripheral surface F10 of the stirring pin F2 is brought into contact with the level difference side surface 12b and the flat surface F3 of the stirring pin F2 is not brought into contact with the level difference bottom surface 12a as in the present embodiment, the offset N is set to 0 < N.ltoreq.0.5 mm, and more preferably 0 < N.ltoreq.0.25 mm.

In the conventional method of manufacturing a liquid-cooled jacket shown in fig. 41, since the jacket main body 101 and the seal 102 have different hardnesses, the material resistance received by the stirring pin F2 is greatly different between the one side and the other side with respect to the rotation center axis C. Therefore, the plastic fluidizing material is not stirred with a high balance, and this causes a reduction in the bonding strength. However, according to the present embodiment, the amount of contact between the outer peripheral surface F10 of the agitating pin F2 and the sleeve body 2 is reduced as much as possible, and therefore, the material resistance that the agitating pin F2 receives from the sleeve body 2 can be reduced as much as possible. In the present embodiment, the inclination angle β of the level difference side surface 12b of the peripheral wall level difference portion 12 is made the same as the inclination angle α of the stirring pin F2 (the level difference side surface 12b is made parallel to the outer peripheral surface F10 of the stirring pin F2), so that the contact amount of the stirring pin F2 with the level difference side surface 12b can be made uniform in the height direction. Thus, in the present embodiment, the plastic fluidizing material is stirred with a high balance, and therefore, the strength of the joined portion can be suppressed from being lowered.

[ ninth embodiment ]

Next, a method for manufacturing a liquid-cooled jacket according to a ninth embodiment of the present invention will be described. In the method of manufacturing a liquid-cooled jacket according to the ninth embodiment, a preparation step, a mounting step, a first primary bonding step, and a second primary bonding step are performed. In the ninth embodiment, the preparation step, the mounting step, and the second primary bonding step are the same as those in the seventh embodiment, and therefore, the description thereof is omitted. In the ninth embodiment, the explanation will be focused on the differences from the seventh embodiment.

As shown in fig. 29, the first primary welding step is a step of friction stir welding the sleeve body 2 and the seal 3 using a rotary tool F. In the primary joining step, when the stirring pin F2 is moved relatively along the first butting portion J1, friction stir joining is performed in a state where the outer peripheral surface F10 of the stirring pin F2 is not in contact with the step side surface 12b and the flat surface F3 is slightly in contact with the step bottom surface 12 a.

According to the method of manufacturing the liquid cooling jacket of the present embodiment, the stirring pin F2 is not in contact with the level difference side surface 12b of the peripheral wall level difference portion 12, but the second aluminum alloy on the main seal 3 side of the first butt joint portion J1 is stirred and plastically fluidized by the frictional heat of the seal 3 and the stirring pin F2, so that the level difference side surface 12b and the outer peripheral side surface 3c of the seal 3 can be joined at the first butt joint portion J1. Further, friction stirring is performed by bringing only the outer peripheral surface F10 of the stirring pin F2 into contact with only the closure 3 at the first butting portion J1, and therefore, the first aluminum alloy hardly mixes into the closure 3 from the jacket main body 2. Thus, the second aluminum alloy mainly on the side of the seal 3 is friction-stirred at the first butt joint portion J1, and therefore, a decrease in the joining strength can be suppressed.

Further, since the step side surface 12b of the jacket main body 2 is inclined outward, the contact of the stirring pin F2 with the step side surface 12b can be easily avoided. In the present embodiment, the inclination angle β of the step side surface 12b is made equal to the inclination angle α of the stirring pin F2 (the step side surface 12b is made parallel to the outer peripheral surface F10 of the stirring pin F2), so that the stirring pin F2 and the step side surface 12b can be brought as close as possible while avoiding contact between the stirring pin F2 and the step side surface 12 b.

Further, since the friction stir welding is performed by separating the outer peripheral surface F10 of the stirring pin F2 from the step side surface 12b, the imbalance of the material resistance received by the stirring pin F2 on one side and the other side of the rotation center axis C of the stirring pin F2 can be reduced. This makes it possible to suppress a decrease in the bonding strength because the plastic fluidizing material is friction-stirred with a high balance. Preferably, as in the present embodiment, when the outer peripheral surface F10 of the stirring pin F2 is not brought into contact with the level difference side surface 12b and the flat surface F3 is inserted deeper than the level difference bottom surface 12a, the distance L from the level difference side surface 12b to the outer peripheral surface F10 of the stirring pin F2 is set to, for example, 0. ltoreq. l.ltoreq.0.5 mm, and more preferably, 0. ltoreq. l.ltoreq.0.3 mm.

Further, since the flat surface F3 of the stirring pin F2 is kept in slight contact with the stepped bottom surface 12a, the mixing of the first aluminum alloy from the jacket main body 2 into the closure 3 can be reduced as much as possible also at the second abutting portion J2. Further, by inserting the flat surface F3 of the stirring pin F2 into the stepped bottom surface 12a, the second butted portion J2 can be more reliably friction-stirred. This can prevent the occurrence of void defects and the like in the plasticized region W1, and can improve the bonding strength. Further, the entire surface of the flat surface F3 of the stirring pin F2 is located closer to the center side of the closure 3 than the outer peripheral side surface 3c of the closure 3. This can increase the joining area of the second butt joint portion J2, and therefore can improve the joining strength.

[ tenth embodiment ]

Next, a method for manufacturing a liquid-cooled jacket according to a tenth embodiment of the present invention will be described. In the method of manufacturing a liquid cooling jacket according to the tenth embodiment, a preparation step, a mounting step, a first primary welding step, and a second primary welding step are performed. In the tenth embodiment, the preparation step, the mounting step, and the second primary bonding step are the same as those in the first embodiment, and therefore, the description thereof is omitted. In the tenth embodiment, the description will be focused on the differences from the ninth embodiment.

As shown in fig. 30, the first main joining step is a step of friction stir joining the first butt joint portion J1 using the rotary tool F. In the primary joining step, when the stirring pin F2 is moved relatively along the first butting portion J1, friction stir joining is performed such that the outer peripheral surface F10 of the stirring pin F2 slightly contacts the level difference side surface 12b of the peripheral wall level difference portion 12 and the flat surface F3 slightly contacts the level difference bottom surface 12 a.

Here, the contact amount between the outer peripheral surface F10 of the stirring pin F2 and the level difference side surface 12b is set as an offset amount N. In the case where the flat surface F3 of the stirring pin F2 is inserted deeper than the level difference bottom surface 12a of the peripheral wall level difference portion 12 and the outer peripheral surface F10 of the stirring pin F2 is brought into contact with the level difference side surface 12b as in the present embodiment, the offset N is set to 0 < N.ltoreq.1.0 mm, preferably 0 < N.ltoreq.0.85 mm, and more preferably 0 < N.ltoreq.0.65 mm.

In the conventional method of manufacturing a liquid-cooled jacket shown in fig. 41, since the jacket main body 101 and the seal 102 have different hardnesses, the material resistance received by the stirring pin F2 is greatly different between the one side and the other side with respect to the rotation center axis C. Therefore, the plastic fluidizing material is not stirred with a high balance, and this causes a reduction in the bonding strength. However, according to the present embodiment, the amount of contact between the outer peripheral surface F10 of the agitating pin F2 and the sleeve body 2 is reduced as much as possible, and therefore, the material resistance that the agitating pin F2 receives from the sleeve body 2 can be reduced as much as possible. In the present embodiment, the inclination angle β of the step side surface 12b is made equal to the inclination angle α of the stirring pin F2 (the step side surface 12b is made parallel to the outer peripheral surface F10 of the stirring pin F2), so that the contact amount between the stirring pin F2 and the step side surface 12b can be made uniform in the height direction. Thus, in the present embodiment, the plastic fluidizing material is stirred with a high balance, and therefore, the strength of the joined portion can be suppressed from being lowered.

Further, since the flat surface F3 of the stirring pin F2 is kept in slight contact with the stepped bottom surface 12a, the mixing of the first aluminum alloy from the jacket main body 2 into the closure 3 can be reduced as much as possible also at the second abutting portion J2. Further, by inserting the flat surface F3 of the stirring pin F2 into the stepped bottom surface 12a, the second butted portion J2 can be more reliably friction-stirred. This can prevent the occurrence of void defects and the like in the plasticized region W1, and can improve the bonding strength. That is, according to the present embodiment, both the first butt joint portion J1 and the second butt joint portion J2 can be more firmly engaged.

[ eleventh embodiment ]

Next, a method for manufacturing a liquid-cooled jacket according to an eleventh embodiment of the present invention will be described. In the method of manufacturing a liquid cooling jacket according to the eleventh embodiment, a preparation step, a mounting step, a first primary bonding step, and a second primary bonding step are performed. In the eleventh embodiment, the preparation step, the placement step, and the first primary bonding step are the same as those in the seventh embodiment, and therefore, descriptions thereof are omitted.

As shown in fig. 31, in the second primary welding step of the eleventh embodiment, friction stirring is performed while the flat surface F3 of the stirring pin F2 is separated from the level difference bottom surface 17a while the outer peripheral surface F10 of the stirring pin F2 is slightly brought into contact with the level difference side surface 17b of the column level difference portion 17. The contact amount between the outer peripheral surface F10 of the stirring pin F2 and the step side surface 17b may be appropriately set, but is preferably set to be the same as the offset amount N (see fig. 28) in the first primary welding step of the eighth embodiment.

According to the second main joining step of the eleventh embodiment, the pillar 15 and the closure 3 are joined together, whereby the joining can be performed firmly. Further, since the outer peripheral surface F10 of the stirring pin F2 is kept in slight contact with the stepped side surface 17b of the pillar stepped portion 17, the mixing of the first aluminum alloy into the seal 3 from the jacket main body 2 can be reduced as much as possible. Thereby, the second aluminum alloy, which is mainly on the side of the closure 3, is friction-stirred at the third butting portion J3, and therefore, a decrease in the joining strength can be suppressed. In the second primary welding step of the eleventh embodiment, friction stirring may be performed in a state where the flat surface F3 is slightly in contact with the step bottom surface 17a of the pillar step 17. That is, in the second primary welding step of the present embodiment, the flat surface F3 may slightly contact the level difference bottom surface 17a while the outer peripheral surface F10 of the stirring pin F2 slightly contacts the level difference side surface 17 b. This can reduce the mixing of the first aluminum alloy from the jacket main body 2 into the seal 3 as much as possible, and can also firmly join the fourth butting portion J4.

[ twelfth embodiment ]

A method for manufacturing a liquid-cooled jacket according to a twelfth embodiment of the present invention will be described in detail with reference to the drawings. As shown in fig. 32, the liquid-cooled jacket 1 is manufactured by friction stir joining the jacket main body 2 and the closure 3.

In the method of manufacturing a liquid cooling jacket according to the present embodiment, a preparation step, a mounting step, a first primary bonding step, and a second primary bonding step are performed. The preparation step is a step of preparing the sleeve body 2 and the seal 3. The jacket main body 2 and the seal 3 of the present embodiment are common to the seventh embodiment, except that the step side surface 12b and the seal 3 have the same plate thickness.

As shown in fig. 33, the mounting step is a step of mounting the seal 3 on the jacket main body 2. In the mounting step, the back surface 3b of the seal 3 is mounted on the step bottom surface 12 a. The step side surface 12b is butted against the outer peripheral side surface 3c of the closure 3 to form a first butted portion J1. Further, the stepped bottom surface 12a is butted against the back surface 3b of the closure 3 to form a second butted portion J2. In the present embodiment, when the seal 3 is placed, the peripheral wall end surface 11a of the peripheral wall portion 11 is flush with the front surface 3a of the seal 3.

In addition, the hole wall 4a of the hole 4 is butted against the stepped side surface 17b of the pillar stepped portion 17 in the mounting step to form a third butted portion J3. Further, the back surface 3b of the seal 3 is butted against the stepped bottom surface 17a of the pillar stepped portion 17 to form a fourth butted portion J4. In the present embodiment, the projecting portion 16 is formed to be tapered, but may be formed to be cylindrical. That is, the step side surface 17b of the pillar step 17 may be brought into surface contact with the hole wall 4a of the hole 4, or the step side surface 17b of the pillar step 17 may be opposed to the hole wall 4a of the hole 4 with a slight gap therebetween.

As shown in fig. 34 and 35, the first main joining step is a step of friction stir joining the first butt joint portion J1 using a rotary tool FA. The rotary tool FA includes a coupling portion F1 and a stirring pin F2. The rotary tool FA is formed of, for example, tool steel. The connection portion F1 is a portion connected to a rotating shaft of a friction stir device (not shown). The coupling portion F1 has a cylindrical shape and is formed with a screw hole (not shown) to which a bolt is fastened.

The stirring pin F2 is suspended from the coupling portion F1 and is coaxial with the coupling portion F1. The stirring pin F2 has a tapered tip as it goes away from the coupling portion F1. As shown in fig. 35, a flat surface F3 and a projection F4 protruding from the flat surface F3 are formed at the tip of the stirring pin F2, and the flat surface F3 is perpendicular to the rotation center axis C. That is, the outer surface of the stirring pin F2 is composed of an outer peripheral surface F10 tapered at the tip, a flat surface F3 formed at the tip, and a protrusion F4. In the side view, the inclination angle α of the rotation center axis C to the outer peripheral surface F10 of the stirring pin F2 may be appropriately set within a range of, for example, 5 ° to 30 °, but in the present embodiment, the inclination angle β to the level difference side surface 12b of the peripheral wall level difference portion 12 and the inclination angle γ to the level difference side surface 17b of the pillar level difference portion 17 are set to be the same.

A spiral groove is engraved in the outer peripheral surface F10 of the stirring pin F2. As shown in fig. 34, when friction stirring is performed using the rotary tool FA, only the stirring pin F2 that rotates to the right is inserted into the seal 3, and the stirring pin F2 is moved while separating the seal 3 from the coupling portion F1. In other words, the friction stirring is performed with the base end portion of the stirring pin F2 exposed. The plasticized region W1 is formed on the moving locus of the rotary tool FA due to solidification of the metal after the friction stirring. In the present embodiment, the stirring pin F2 is inserted at the start position Sp set at the closure 3, and the rotating tool FA is relatively moved to rotate rightward with respect to the closure 3.

As shown in fig. 35, in the first primary joining step, only the stirring pin F2 is inserted into the closure 3, and the rotating tool FA is rotated once along the first butt joint portion J1 without bringing the outer peripheral surface F10 of the stirring pin F2 into contact with the level difference side surface 12b of the peripheral wall level difference portion 12. In the present embodiment, the insertion depth is set so that the flat surface F3 of the stirring pin F2 does not contact the stepped bottom surface 12a of the peripheral wall stepped portion 12 of the cover main body 2, and so that the protrusion F4 contacts the stepped bottom surface 12 a. The front end surface F5 of the projection F4 contacts the peripheral wall 11. The phrase "the outer peripheral surface F10 of the stirring pin does not contact the level difference side surface 12b of the peripheral wall level difference portion 12" also includes a case where the distance between the outer peripheral surface F10 of the stirring pin F2 and the level difference side surface 12b is zero when friction stirring is performed.

If the distance from the stepped side surface 12b to the outer peripheral surface F10 of the stirring pin F2 is too long, the bonding strength of the first butting portion J1 decreases. The distance L from the step side surface 12b to the outer peripheral surface F10 of the stirring pin F2 may be appropriately set according to the material of the jacket main body 2 and the closure 3, but is preferably set to 0L 0.5mm, more preferably 0L 0.3mm, for example, when the outer peripheral surface F10 of the stirring pin F2 does not contact the step side surface 12b and the flat surface F3 does not contact the step bottom surface 12a as in the present embodiment.

After rotating the rotating tool FA one revolution around the closure 3, the beginning and the end of the plasticised area W1 are brought to coincide. The rotating tool FA can also be extracted by gradually rising in the front face 3a of the closure 3. Fig. 36 is a sectional view of the joined portion after the main joining step of the present embodiment. A plasticized region W1 is formed on the closure 3 side, bounded by the first butt J1. Further, the flat surface F3 of the stirring pin F2 does not contact the stepped bottom surface 12a (see fig. 35), and the plasticized region W1 is formed to exceed the second butting portion J2 and reach the jacket main body 2.

As shown in fig. 37 and 38, the second main joining step is a step of friction stir joining the third butting portion J3 using a rotary tool FA. As shown in fig. 37, in the second main joining step, only the stirring pin F2 that rotates to the right is inserted to the start position Sp set on the front surface 3a of the seal 3, and the stirring pin F2 is moved while separating the seal 3 from the coupling portion F1. In other words, the friction stirring is performed with the base end portion of the stirring pin F2 exposed. The plasticized region W2 is formed on the moving locus of the rotary tool FA due to solidification of the metal after the friction stirring.

In the second primary welding step, as shown in fig. 38, friction stirring is performed so that the outer peripheral surface F10 of the stirring pin F2 is separated from the step side surface 17b of the pillar step 17. Further, in a state where the flat surface F3 of the stirring pin F2 is not in contact with the stepped bottom surface 17a and the protrusion F4 is in contact with the stepped bottom surface 17a, the rotary tool FA is relatively moved along the fourth butting portion J4. The front end surface F5 of the projection F4 contacts the pillar 15. After the rotating tool FA is rotated once along the protruding portion 16, the start end and the end of the plasticized region W2 are overlapped. Since the friction stirring is performed in a state where the flat surface F3 of the stirring pin F2 is not in contact with the level difference bottom surface 17a of the pillar level difference portion 17 and the protrusion F4 is in contact with the level difference bottom surface 17a, the plasticized region W2 is formed to reach the fourth butting portion J4. That is, in the second main joining step, the fourth butting portion J4 is plastically fluidized by the frictional heat of the stirring pin F2 with the closure 3 and the pillar 15 to join them.

According to the method for manufacturing the liquid-cooled jacket of the present embodiment described above, the stirring pin F2 of the rotary tool FA does not contact the step side surface 12b of the peripheral wall step portion 12, but the second aluminum alloy on the main seal 3 side of the first butt joint portion J1 is stirred by the frictional heat of the seal 3 and the stirring pin F2 to be plastically fluidized, so that the step side surface 12b and the outer peripheral side surface 3c of the seal 3 can be joined at the first butt joint portion J1. Further, friction stirring is performed by bringing only the stirring pin F2 into contact with the seal 3, and therefore, the first aluminum alloy hardly enters the seal 3 from the jacket main body 2. Thus, the second aluminum alloy mainly on the side of the seal 3 is friction-stirred at the first butt joint portion J1, and therefore, a decrease in the joining strength can be suppressed.

Further, in the first main joining step, friction stir joining is performed by bringing only the stirring pin F2 into contact with the closure 3, and therefore, it is possible to eliminate imbalance of the material resistance received by the stirring pin F2 on one side and the other side of the rotation center axis C of the stirring pin F2. This makes it possible to suppress a decrease in the bonding strength because the plastic fluidizing material is friction-stirred with a high balance.

In the first primary welding step, the rotation direction and the advancing direction of the rotary tool FA may be appropriately set, but the rotation direction and the advancing direction of the rotary tool FA are set so that the sleeve body 2 side and the seal 3 side in the plasticized region W1 formed on the movement locus of the rotary tool FA become the shear side and the flow side, respectively. By setting the sleeve body 2 side to be the shearing side, the stirring action of the stirring pin F2 around the first butt joint portion J1 is increased, and the step side surface 12b and the outer peripheral side surface 3c of the closure 3 can be more reliably joined at the first butt joint portion J1 in anticipation of a temperature rise at the first butt joint portion J1.

In the present embodiment, the flat surface F3 of the stirring pin F2 is not inserted deeper than the level difference bottom surface 12a at the first butt joint portion J1, but the plasticized region W1 reaches the second butt joint portion J2, and therefore, the joint strength can be improved.

Further, at the second butting portion J2, since the projection portion F4 is formed on the flat surface F3 on the tip end side of the stirring pin F2, the plastic fluidizing material that is friction-stirred along the projection portion F4 and is wound up at the projection portion F4 is pressed by the flat surface F3. This makes it possible to more reliably perform friction stirring around the projection F4 and to reliably cut the oxide film of the fourth butt portion J4, thereby improving the bonding strength of the fourth butt portion J4. Further, since the friction stirring is performed in a state where the flat surface F3 of the stirring pin F2 is not in contact with the step bottom surface 17a and the protrusion F4 is in contact with the step bottom surface 17a of the pillar step 17, the width of the plasticized region at the step bottom surface 17a can be reduced. This also makes it possible to set the width of the step bottom surface 17a small.

Further, since friction stirring is performed in a state where the flat surface F3 of the stirring pin F2 is not in contact with the stepped bottom surface 17a, the first aluminum alloy hardly enters from the jacket main body 2 toward the seal 3 even at the fourth butting portion J4, and therefore, the second aluminum alloy mainly on the side of the seal 3 is friction-stirred at the fourth butting portion J4, and thus, a decrease in the joining strength can be suppressed. That is, in the present embodiment, while the oxide film of the fourth butting portion J4 is reliably cut off, the first aluminum alloy is suppressed from mixing from the jacket main body 2 toward the seal 3.

In the second primary welding step, although the stirring pin F2 of the rotary tool FA does not contact the stepped side surface 17b of the pillar stepped portion 17, the second aluminum alloy of the third butt portion J3, mainly on the seal 3 side, is stirred by frictional heat of the seal 3 and the stirring pin F2 to be plastically fluidized, so that the stepped side surface 17b and the hole wall 4a of the hole portion 4 can be joined at the third butt portion J3. Further, friction stirring is performed by bringing only the stirring pin F2 into contact with the seal 3, and therefore, the first aluminum alloy hardly enters the seal 3 from the jacket main body 2. Thereby, the second aluminum alloy, which is mainly on the side of the closure 3, is friction-stirred at the third butting portion J3, and therefore, a decrease in the joining strength can be suppressed.

In the second primary welding step, the stepped side surface 17b of the sleeve body 2 is inclined so as to be tapered, and therefore, the contact of the stirring pin F2 with the sleeve body 2 can be easily avoided. In the present embodiment, the inclination angle γ of the step side surface 17b is made the same as the inclination angle α of the stirring pin F2 (the step side surface 17b is made parallel to the outer peripheral surface F10 of the stirring pin F2), so that the stirring pin F2 and the step side surface 17b can be made as close as possible while avoiding contact between the stirring pin F2 and the step side surface 17 b.

Further, in the second main joining step, friction stir joining is performed by bringing only the stirring pin F2 into contact with the closure 3, and therefore, it is possible to eliminate imbalance of the material resistance received by the stirring pin F2 on one side and the other side of the rotation center axis C of the stirring pin F2. This makes it possible to suppress a decrease in the bonding strength because the plastic fluidizing material is friction-stirred with a high balance.

In the second primary welding step, the rotation direction and the advancing direction of the rotary tool FA may be appropriately set, but the rotation direction and the advancing direction of the rotary tool FA are set so that the sleeve body 2 side and the seal 3 side in the plasticized region W1 formed on the movement locus of the rotary tool FA become the shear side and the flow side, respectively. Further, by setting the sleeve main body 2 side to be the shear side, the stirring action of the stirring pin F2 around the third butting portion J3 is increased, and the temperature rise at the third butting portion J3 can be expected, and the step side surface 17b and the hole wall 4a of the hole portion 4 can be joined more reliably at the third butting portion J3.

Further, since the friction stirring is performed in a state where the flat surface F3 of the stirring pin F2 is not in contact with the stepped bottom surface 17a of the pillar stepped portion 17, the first aluminum alloy hardly enters from the jacket main body 2 toward the seal 3 even in the fourth butting portion J4. Thereby, the second aluminum alloy, which is mainly on the side of the closure 3, is friction-stirred at the fourth butting portion J4, and therefore, a decrease in the joining strength can be suppressed. Further, the strength of the entire liquid cooling jacket 1 can be improved by joining the stay 15 and the seal 3.

In addition, either the first primary bonding step or the second primary bonding step may be performed first. Before the first primary joining step is performed, at least one of the first butt joint portion J1 and the second butt joint portion J2 may be temporarily joined by friction stir welding or welding. By performing the temporary joining, the joint portions can be prevented from being cracked in the first primary joining step and the second primary joining step.

[ thirteenth embodiment ]

Next, a method for manufacturing a liquid-cooled jacket according to a thirteenth embodiment of the present invention will be described. In the method of manufacturing a liquid-cooled jacket according to the thirteenth embodiment, a preparation step, a mounting step, a first primary bonding step, and a second primary bonding step are performed. In the thirteenth embodiment, the preparation step, the mounting step, and the second primary bonding step are the same as those in the twelfth embodiment, and therefore, descriptions thereof are omitted. In the thirteenth embodiment, a description will be given centering on a portion different from the twelfth embodiment.

As shown in fig. 39, the first primary welding step is a step of friction stir welding the first butting portion J1 using a rotary tool FA. In the primary joining step, when the stirring pin F2 is moved relatively along the first butting portion J1, friction stir joining is performed in a state where the outer peripheral surface F10 of the stirring pin F2 is slightly in contact with the level difference side surface 12b of the peripheral wall level difference portion 12 and the protrusion portion F4 is not in contact with the level difference bottom surface 12 a. In the first primary bonding step, the flat surface F3 is not brought into contact with the step bottom surface 12 a.

In the thirteenth embodiment, the plate thickness of the seal 3 may be increased or an inclined surface may be provided on the outer peripheral side surface as in the first and second modifications of the first embodiment.

[ fourteenth embodiment ]

Next, a method for manufacturing a liquid-cooled jacket according to a fourteenth embodiment will be described. In the method of manufacturing a liquid-cooled jacket according to the fourteenth embodiment, a preparation step, a mounting step, a first primary bonding step, and a second primary bonding step are performed. In the present embodiment, the second primary welding step is different from the other embodiments in that the stirring pin F2 is slightly brought into contact with the protruding portion 16.

In the second primary welding step, as shown in fig. 40, friction stirring is performed in a state where the outer peripheral surface F10 of the stirring pin F2 is slightly in contact with the step side surface 17b of the pillar step 17. Friction stirring was performed in a state where the flat surface F3 was not in contact with the level difference bottom surface 17a and the protrusion F4 was in contact with the level difference bottom surface 17 a. Preferably, the outer peripheral surface F10 of the stirring pin F2 has the same inclination angle with the level difference side surface 17b (the outer peripheral surface F10 is parallel to the level difference side surface 17 b).

In the second primary bonding step, the plastic fluidized material wound around the protrusion F4 is pressed against the flat surface F3. This makes it possible to more reliably friction stir the periphery of the protrusion F4 and reliably cut off the oxide film of the fourth butt portion J4. This can improve the joint strength of the fourth butting portion J4. Further, by setting the flat surface F3 so as not to contact the step bottom surface 17a as in the present modification, the width of the plasticized region W2 can be reduced as compared with the case where the flat surface F3 is inserted deeper than the step bottom surface 17 a. This prevents the plastic fluidizing material from flowing out to the recessed portion 13, and the width of the step bottom surface 17a of the pillar step portion 17 can be set small. The contact amount of the stirring pin F2 with the protruding portion 16 may be set to be the same as that in the first primary welding step of the thirteenth embodiment.

(symbol description)

1, liquid cooling;

2 sets of main bodies;

3, closing the container;

3a front surface;

3b back side;

3c a peripheral side surface;

10, a bottom part;

11a peripheral wall portion;

11a peripheral wall end face;

12 peripheral wall layer difference parts;

12a floor difference bottom surface;

12b a layer difference side;

13 a recess;

17a pillar step portion;

17a floor difference bottom surface;

17b a layer difference side;

f, rotating the tool;

f2 stirring pin;

j1 first butt joint;

j2 second docking portion;

j3 third interface;

j4 fourth docking station;

k table (cooling plate);

a W1 plasticized region;

a W2 plasticized region;

WP cooling tube.

Claims

1. A method of manufacturing a liquid-cooled jacket, the jacket being composed of a jacket main body and a sealing material, wherein the jacket main body has a bottom portion, a peripheral wall portion rising from a peripheral edge of the bottom portion, and a pillar rising from the bottom portion, the sealing material includes a hole portion into which a leading end of the pillar is inserted, and closes an opening portion of the jacket main body, in the method of manufacturing a liquid-cooled jacket, the jacket main body and the sealing material are joined by friction stirring, characterized in that,

the jacket main body is formed of a first aluminum alloy, the closure is formed of a second aluminum alloy, the first aluminum alloy is a material species having a higher hardness than the second aluminum alloy,

the outer peripheral surface of the stirring pin of the rotary tool is inclined in such a manner that the front end becomes thin,

the manufacturing method of the liquid cooling jacket comprises the following steps:

a preparation step of forming a peripheral wall step portion on an inner peripheral edge of the peripheral wall portion, the peripheral wall step portion having a step bottom surface and step side surfaces rising obliquely so as to extend outward from the step bottom surface toward the opening portion, and forming a pillar step portion at a front end of the pillar, the pillar step portion having a step bottom surface and step side surfaces rising from the step bottom surface;

a mounting step of mounting the seal on the jacket main body so that a level difference side surface of the peripheral wall level difference portion is brought into abutment with an outer peripheral side surface of the seal to form a first abutment portion, and a level difference bottom surface of the peripheral wall level difference portion is brought into abutment with a back surface of the seal to form a second abutment portion, and then a level difference side surface of the strut level difference portion is brought into abutment with a hole wall of the hole portion of the seal to form a third abutment portion, and a level difference bottom surface of the strut level difference portion is brought into abutment with the back surface of the seal to form a fourth abutment portion;

a first primary welding step of inserting only the rotating stirring pin into the seal member, and rotating the rotating tool by one rotation along the first butting portion while bringing only the stirring pin into contact with only the seal member, thereby performing friction stirring; and

and a second primary welding step of inserting only the rotating stirring pin into the seal member, and rotating the rotating tool once along the third butting portion while slightly contacting the stirring pin with the step side surface of the pillar step portion to perform friction stirring.

2. The method of manufacturing a liquid cooling jacket according to claim 1,

in the second primary welding step, the rotating tool is rotated once along the third butting portion while the stirring pin is brought into slight contact with the stepped bottom surface of the pillar stepped portion, thereby performing friction stirring.

3. A method of manufacturing a liquid-cooled jacket, the jacket being composed of a jacket main body and a sealing material, wherein the jacket main body has a bottom portion, a peripheral wall portion rising from a peripheral edge of the bottom portion, and a pillar rising from the bottom portion, the sealing material includes a hole portion into which a leading end of the pillar is inserted, and closes an opening portion of the jacket main body, in the method of manufacturing a liquid-cooled jacket, the jacket main body and the sealing material are joined by friction stirring, characterized in that,

a preparation step of forming a peripheral wall step portion on an inner peripheral edge of the peripheral wall portion, the peripheral wall step portion having a step bottom surface and step side surfaces rising obliquely so as to extend outward from the step bottom surface toward the opening portion, and a pillar step portion having a step bottom surface and step side surfaces rising from the step bottom surface being formed at a front end of the pillar;

a first primary welding step of inserting only the rotating stirring pin into the seal member, and rotating the rotating tool by one rotation along the first butting portion while slightly contacting the stirring pin with the step side surface of the peripheral wall step portion to perform friction stirring; and

4. A method of manufacturing a liquid-cooled jacket according to claim 3,

in the first primary welding step, the rotating tool is rotated one turn along the first butting portion to perform friction stirring while the stirring pin is brought into slight contact with the stepped bottom surface of the peripheral wall stepped portion.

5. A method of manufacturing a liquid-cooled jacket according to claim 3 or 4,

6. A method of manufacturing a liquid-cooled jacket according to claim 1 or 3,

in the preparation process, the sleeve body is formed by molding and the bottom is formed to protrude toward the front side, and the closure is formed to protrude toward the front side.

7. The method of manufacturing a liquid cooling jacket according to claim 6,

the amount of deformation of the sleeve body is measured in advance, and friction stirring is performed while adjusting the insertion depth of the stirring pin of the rotary tool in the first primary welding step and the second primary welding step according to the amount of deformation.

8. A method of manufacturing a liquid-cooled jacket according to claim 1 or 3,

a temporary joining step of temporarily joining at least one of the first butting portion and the third butting portion is included before the first primary joining step and the second primary joining step.

9. A method of manufacturing a liquid-cooled jacket according to claim 1 or 3,

in the first primary welding step and the second primary welding step, a cooling plate through which a cooling medium flows is provided on the back surface side of the bottom portion, and friction stirring is performed while the jacket main body and the seal are cooled by the cooling plate.

10. The method of manufacturing a liquid cooling jacket according to claim 9,

the front face of the cooling plate is brought into surface-to-surface contact with the back face of the bottom portion.

11. The method of manufacturing a liquid cooling jacket according to claim 9,

the cooling plate has a cooling flow path through which the cooling medium flows,

the cooling flow path includes a planar shape along a movement locus of the rotary tool in the first primary welding step.

12. The method of manufacturing a liquid cooling jacket according to claim 9,

the cooling flow path through which the cooling medium flows is constituted by a cooling pipe embedded in the cooling plate.

13. A method of manufacturing a liquid-cooled jacket according to claim 1 or 3,

in the first primary welding step and the second primary welding step, a cooling medium is caused to flow through a hollow portion formed by the jacket main body and the seal, and friction stirring is performed while cooling the jacket main body and the seal.

14. A method of manufacturing a liquid-cooled jacket, the jacket being composed of a jacket main body and a sealing material, wherein the jacket main body has a bottom portion, a peripheral wall portion rising from a peripheral edge of the bottom portion, and a pillar rising from the bottom portion, and the sealing material forms a hole portion into which a leading end of the pillar is inserted and closes an opening portion of the jacket main body, in the method of manufacturing a liquid-cooled jacket, the jacket main body and the sealing material are joined by friction stirring, characterized in that,

the outer peripheral surface of a stirring pin of a rotary tool used in friction stirring is inclined in such a manner that the front end is tapered,

a preparation step of forming a peripheral wall step portion on an inner peripheral edge of the peripheral wall portion, the peripheral wall step portion having a step bottom surface and step side surfaces rising from the step bottom surface toward the opening portion, and forming a pillar step portion at a front end of the pillar, the pillar step portion having a step bottom surface and step side surfaces rising obliquely from the step bottom surface so that the front end of the pillar becomes thinner, and then setting a plate thickness of the closure to be larger than a height dimension of the step side surfaces of the pillar step portion;

a mounting step of mounting the seal on the jacket main body so that a step side surface of the peripheral wall step portion is brought into abutment with an outer peripheral side surface of the seal to form a first abutment portion, a step bottom surface of the peripheral wall step portion is brought into abutment with a back surface of the seal to form a second abutment portion, a third abutment portion is formed so that a gap is present when the step side surface of the strut step portion is brought into abutment with the hole wall of the hole portion, and a step bottom surface of the strut step portion is brought into abutment with the back surface of the seal to form a fourth abutment portion; and

and a second primary welding step of inserting only the rotating stirring pin into the seal member and performing friction stirring while allowing the second aluminum alloy of the seal member to flow into the gap when the rotating tool is moved along the third butting portion in a state where the outer peripheral surface of the stirring pin is not in contact with the step side surface of the pillar step portion.

15. The method of manufacturing a liquid cooling jacket according to claim 14,

in the second primary welding step, the rotating tool is moved along the third butting portion while the stirring pin is slightly brought into contact with the stepped bottom surface of the pillar stepped portion, thereby performing friction stirring.

16. A method of manufacturing a liquid-cooled jacket, the jacket being composed of a jacket main body and a sealing material, wherein the jacket main body has a bottom portion, a peripheral wall portion rising from a peripheral edge of the bottom portion, and a pillar rising from the bottom portion, and the sealing material forms a hole portion into which a leading end of the pillar is inserted and closes an opening portion of the jacket main body, in the method of manufacturing a liquid-cooled jacket, the jacket main body and the sealing material are joined by friction stirring, characterized in that,

and a second primary welding step of inserting only the rotating stirring pin into the seal member and performing friction stirring while allowing the second aluminum alloy of the seal member to flow into the gap when the rotating tool is moved along the third butting portion in a state where the outer peripheral surface of the stirring pin is slightly in contact with the step side surface of the pillar step portion.

17. The method of manufacturing a liquid cooling jacket according to claim 16,

18. The method of manufacturing a liquid-cooled jacket according to claim 14 or 16,

and performing a first primary welding step of performing friction stirring by moving the rotary tool along the first butting portion and rotating the rotary tool once around the opening.

19. The method of manufacturing a liquid cooling jacket according to claim 18,

20. The method of manufacturing a liquid cooling jacket according to claim 19,

21. The method of manufacturing a liquid cooling jacket according to claim 18,

a temporary joining step of temporarily joining the first butting portion or the third butting portion is included before the first primary joining step and the second primary joining step.

22. The method of manufacturing a liquid cooling jacket according to claim 18,

in the first primary welding step, a cooling plate through which a cooling medium flows is provided on the back surface side of the bottom portion, and friction stirring is performed while the jacket main body and the seal are cooled by the cooling plate.

23. The method of manufacturing a liquid cooling jacket according to claim 22,

24. The method of manufacturing a liquid cooling jacket according to claim 22,

25. The method of manufacturing a liquid cooling jacket according to claim 22,

26. The method of manufacturing a liquid cooling jacket according to claim 18,

in the first primary welding step, a cooling medium is caused to flow through a hollow portion formed by the jacket main body and the seal, and friction stirring is performed while cooling the jacket main body and the seal.

27. A method of manufacturing a liquid-cooled jacket, the jacket being composed of a jacket main body and a sealing material, wherein the jacket main body has a bottom portion, a peripheral wall portion rising from a peripheral edge of the bottom portion, and a pillar rising from the bottom portion, the sealing material includes a hole portion into which a leading end of the pillar is inserted, and closes an opening portion of the jacket main body, in the method of manufacturing a liquid-cooled jacket, the jacket main body and the sealing material are joined by friction stirring, characterized in that,

a flat surface is formed on the front end side of the stirring pin, and the flat surface comprises a protruding part,

a preparation step of forming a peripheral wall step portion on an inner peripheral edge of the peripheral wall portion, the peripheral wall step portion having a step bottom surface and step side surfaces rising from the step bottom surface toward the opening portion, and forming a pillar step portion at a front end of the pillar, the pillar step portion having a step bottom surface and step side surfaces rising from the step bottom surface;

a mounting step of mounting the seal on the jacket main body so that a level difference side surface of the peripheral wall level difference portion is brought into abutment with an outer peripheral side surface of the seal to form a first abutment portion, and a level difference bottom surface of the peripheral wall level difference portion is brought into abutment with a back surface of the seal to form a second abutment portion, and then a level difference side surface of the strut level difference portion is brought into abutment with a hole wall of the hole portion of the seal to form a third abutment portion, and a level difference bottom surface of the strut level difference portion is brought into abutment with the back surface of the seal to form a fourth abutment portion; and

and a second primary welding step of inserting only the rotating stirring pin into the seal member, and performing friction stirring by moving the rotating tool along the third butting portion while keeping the outer peripheral surface of the stirring pin out of contact with the step side surface of the pillar step portion and keeping the protrusion of the stirring pin in contact with the step bottom surface of the pillar step portion.

28. The method of manufacturing a liquid cooling jacket according to claim 27,

in the second primary welding step, the rotating tool is moved along the third butting portion so as to perform friction stirring while the flat surface of the stirring pin is not in contact with the stepped bottom surface of the pillar stepped portion.

29. A method of manufacturing a liquid-cooled jacket, the jacket being composed of a jacket main body and a sealing material, wherein the jacket main body has a bottom portion, a peripheral wall portion rising from a peripheral edge of the bottom portion, and a pillar rising from the bottom portion, the sealing material includes a hole portion into which a leading end of the pillar is inserted, and closes an opening portion of the jacket main body, in the method of manufacturing a liquid-cooled jacket, the jacket main body and the sealing material are joined by friction stirring, characterized in that,

and a second primary welding step of inserting only the rotating stirring pin into the seal, and moving the rotating tool along the third butting portion to perform friction stirring while bringing the outer peripheral surface of the stirring pin into slight contact with the step side surface of the pillar step portion and bringing the protrusion of the stirring pin into contact with the step bottom surface of the pillar step portion.

30. The method of manufacturing a liquid cooling jacket according to claim 29,

31. The method of manufacturing a liquid cooling jacket according to claim 27 or 29,

the method of manufacturing a liquid-cooled jacket includes a first primary welding step of performing friction stirring by moving the rotary tool along the first butting portion and rotating the rotary tool once around the opening portion.

32. The method of manufacturing a liquid cooling jacket according to claim 31,

33. The method of manufacturing a liquid cooling jacket according to claim 32,

the amount of deformation of the sleeve body is measured in advance, and friction stirring is performed in the first primary welding step and the second primary welding step while adjusting the insertion depth of the stirring pin of the rotary tool according to the amount of deformation.

34. The method of manufacturing a liquid cooling jacket according to claim 31,

35. The method of manufacturing a liquid cooling jacket according to claim 31,

36. The method of manufacturing a liquid cooling jacket according to claim 35,

37. The method of manufacturing a liquid cooling jacket according to claim 35,

38. The method of manufacturing a liquid cooling jacket according to claim 35,

39. The method of manufacturing a liquid cooling jacket according to claim 31,