JP2021112748A - Manufacturing method of liquid-cooled jacket - Google Patents

Abstract

To provide a manufacturing method of a liquid-cooled jacket capable of manufacturing the liquid-cooled jacket at low cost.SOLUTION: A manufacturing method of a liquid-cooled jacket includes a first regular joining process for inserting a rotating tip side pin F3 of a rotary tool F into a first abutting part J1, and performing friction agitation on the first abutting part J1 by relatively going around a sealing body 3 and a step side surface 14b of a peripheral step part 14 along the first abutting part J1 in a state where the outer circumferential surface of a base end side pin F2 is brought into contact with a surface 3a of the sealing body 3. In the first regular joining process, while holding a bottom part 10 of a jacket body 2 and the surface 3a of the sealing body 3 by pushing them from both outer sides with a pair of holding parts 22, friction agitation is performed on the jacket body 2 and the sealing body 3 by rotating and translating the jacket body 2 and the sealing body 3 with use of the holding parts 22.SELECTED DRAWING: Figure 9

Description

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

A method for manufacturing a liquid-cooled jacket using friction stir welding is used. For example, Patent Document 1 discloses a method for manufacturing a liquid-cooled jacket in which a jacket body and a sealing body that seals an opening of the jacket body are joined by friction stir welding. In the method for manufacturing the liquid-cooled jacket, a rotating tool is inserted vertically from the side surface of the jacket body and the sealing body, and friction stir welding is performed by rotating the jacket body around the jacket body.

JP-A-2018-69322

In the invention according to Patent Document 1, in order to rotate the rotation tool around the jacket body with the rotation tool and the side surface of the jacket body perpendicular to each other, a rotation tool is provided, for example, a rotation driving means such as a spindle unit at the tip. It is necessary to change / adjust the angle and insertion position of the rotation center axis of the rotation tool by attaching it to the arm robot. Therefore, there is a problem that ancillary equipment such as a device for driving the rotary tool is costly, and as a result, the manufacturing cost is high.

From such a viewpoint, it is an object of the present invention to provide a method for manufacturing a liquid-cooled jacket capable of manufacturing the liquid-cooled jacket at low cost.

In order to solve the above problems, the present invention comprises a jacket body having a bottom, a peripheral wall portion rising from the peripheral edge of the bottom, and a support column rising from the bottom, and a sealing body for sealing the opening of the jacket body. A method for manufacturing a liquid-cooled jacket in which the jacket body and the sealing body are joined by frictional stirring. The rotary tool used in frictional stirring includes a proximal end side pin and a distal end side pin, and the proximal end side is provided. The taper angle of the pin is larger than the taper angle of the tip end side pin, a stepped step portion is formed on the outer peripheral surface of the base end side pin, and a step portion is formed on the inner peripheral edge of the peripheral wall portion. A jacket body having a bottom surface and a stepped side surface rising from the stepped bottom surface toward the opening, and a sealing body having a thickness larger than the height of the stepped side surface are prepared. By placing the sealing body on the jacket body, the stepped side surface of the peripheral wall portion and the side surface of the sealing body are abutted to form the first abutting portion, and the step bottom surface of the peripheral wall portion is formed. And the back surface of the sealing body are overlapped to form a second butt portion, and the end surface of the support column and the back surface of the sealing body are overlapped to form a fourth butt portion. The tip end side pin of the rotation tool is inserted into the first abutting portion, and the outer peripheral surface of the base end side pin is at least sealed while the tip end side pin is in contact with the peripheral wall portion and the sealing body. A first joining step in which the first butt portion is rubbed and agitated by making a relative circumference along the first butt portion at a predetermined depth along the first butt portion in a state of being in contact with the surface of the body. In the first main joining step, the bottom portion of the jacket body and the surface of the sealing body are pressed and held by a pair of holding portions from both outer sides, and the holding portions are used. It is characterized in that the jacket body and the sealing body are rotated or moved in parallel to frictionally stir the jacket body and the sealing body.

Further, the present invention includes a jacket body having a bottom portion, a peripheral wall portion rising from the peripheral edge of the bottom portion, and a support column rising from the bottom portion, and a hole into which the tip of the support column is inserted, and seals the opening of the jacket body. A method for manufacturing a liquid-cooled jacket, which is composed of a sealing body and joins the jacket body and the sealing body by frictional stirring. The taper angle of the base end side pin is larger than the taper angle of the tip end side pin, and a stepped step portion is formed on the outer peripheral surface of the base end side pin, and the peripheral wall portion is provided. A peripheral wall step portion having a step bottom surface and a step side surface rising from the step bottom surface toward the opening is formed on the inner peripheral edge of the column, and from the step bottom surface of the column and the step bottom surface of the column at the tip of the column. A preparatory step for preparing the jacket body having the stepped side surface of the strut having the stepped side surface of the strut and the sealing body having a thickness larger than the height of the stepped side surface, and the sealing on the jacket body. By placing the body, the stepped side surface of the peripheral wall portion and the side surface of the sealing body are abutted to form a first abutting portion, and the stepped bottom surface of the peripheral wall portion and the back surface of the sealing body are overlapped with each other. A second butt portion is formed, and a third butt portion is formed by abutting the step side surface of the support column and the hole wall of the hole portion, and the step bottom surface of the support column and the back surface of the sealing body are overlapped with each other. In the mounting step of forming the fourth butt portion, the tip side pin of the rotating tool is inserted into the first butt portion, and the tip end side pin is brought into contact with the peripheral wall portion and the sealing body. With the outer peripheral surface of the base end side pin in contact with at least the surface of the sealing body, the peripheral surface is relatively made to go around the first butt portion at a predetermined depth along the first butt portion. In the first joining step, which includes a first joining step of rubbing and stirring the first butt portion, the bottom portion of the jacket body and the surface of the sealing body are pressed from both outer sides by a pair of holding portions. The jacket body and the sealing body are rotated or moved in parallel using the holding portion to frictionally stir the jacket body and the sealing body.

According to such a manufacturing method, the jacket body and the sealing body are rotated or translated while the bottom of the jacket body and the surface of the sealing body are held by the pair of holding portions, so that the jacket body and the sealing body are held during the first joining step. The part and the rotation tool do not interfere. That is, the jig for positioning the jacket body and the sealing body does not hinder the movement of the rotating tool. As a result, the man-hours can be reduced and friction stir welding can be easily performed.

Further, the tip end side pin of the rotating tool is inserted from the surface of the sealing body, and the tip end side pin is brought into contact with only the sealing body or the sealing body and the support column. It is preferable to further include a second joining step of frictionally agitating the fourth butt portion by relatively moving the rotating tool with the outer peripheral surface of the side pin in contact with the surface of the sealing body. ..
Further, the tip end side pin of the rotating tool is inserted into the third butt portion, and the outer peripheral surface of the base end side pin is at least sealed while the tip end side pin is in contact with the sealing body and the support column. It is preferable to further include a second joining step in which the rotating tool is relatively moved in contact with the surface of the stop body to frictionally stir the third butt portion.

According to such a manufacturing method, the bonding strength can be increased.

Further, it is preferable to perform the second main joining step after the first main joining step.
Further, it is preferable to perform the first main joining step after the second main joining step.

Further, in the first main joining step, the rotation tool is rotated at a predetermined rotation speed to perform frictional stirring, and when the tip end side pin is separated in the first main joining step, the rotation speed is higher than the predetermined rotation speed. It is preferable to move the rotation tool relative to the end position while gradually increasing the rotation speed.

Further, in the first main joining step, the rotation tool is rotated at a predetermined rotation speed to perform frictional stirring, and when the tip end side pin is inserted in the first main joining step, the rotation speed is higher than the predetermined rotation speed. It is preferable that the tip end side pin is inserted in a rotated state at a high speed, and the pin is relatively moved to the first butt portion while gradually reducing the rotation speed.

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

According to the method for manufacturing a liquid-cooled jacket according to the present invention, the liquid-cooled jacket can be manufactured at low cost.

It is a side view which shows the rotation tool which concerns on embodiment of this invention. It is an enlarged sectional view of the rotation tool. It is sectional drawing which shows the 1st modification of a rotation tool. It is sectional drawing which shows the 2nd modification of the rotation tool. It is sectional drawing which shows the 3rd modification of the rotation tool. It is an exploded perspective view of the liquid-cooled jacket which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the mounting process of the manufacturing method of the liquid-cooled jacket which concerns on 1st Embodiment. It is a perspective view which shows the 1st main joining process of the manufacturing method of the liquid-cooled jacket which concerns on 1st Embodiment. It is a perspective view which shows the 1st main joining process of the manufacturing method of the liquid-cooled jacket which concerns on 1st Embodiment. It is sectional drawing which shows the 1st main joining process of the manufacturing method of the liquid-cooled jacket which concerns on 1st Embodiment. It is a perspective view which shows the 1st main joining process of the manufacturing method of the liquid-cooled jacket which concerns on 1st Embodiment. It is sectional drawing which shows the 2nd joining process of the manufacturing method of the liquid-cooled jacket which concerns on 1st Embodiment. It is sectional drawing which shows the 2nd main joining process of the manufacturing method of the liquid-cooled jacket which concerns on 2nd Embodiment of this invention.

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

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

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

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

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

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

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

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

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

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

In this embodiment, the rotation tool F is attached to a friction stir device that can move in the horizontal direction and the vertical direction. The rotation tool F may be attached to a robot arm having a rotation driving means such as a spindle unit at its tip.

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

The jacket body 2 may be any metal (aluminum, aluminum alloy, magnesium, magnesium alloy, copper, copper alloy, titanium, titanium alloy, etc.) that can be agitated by friction, but in this embodiment, it is made of an aluminum alloy.

The bottom portion 10 is a plate-shaped member having a rectangular shape. The peripheral wall portion 11 is a wall portion that rises in a rectangular frame shape from the peripheral edge portion of the bottom portion 10. The corner of the peripheral wall portion 11 may be a right angle, but in the present embodiment, a round chamfering process is performed. A support column 12 stands up at the bottom 10. The number of columns 12 is not particularly limited, but is two in this embodiment. A recess 13 is formed in the bottom portion 10 and the peripheral wall portion 11. Although the jacket body 2 of the present embodiment is integrally formed, for example, the peripheral wall portion 11 may be divided and joined by a seal member to be integrated.

On the end surface 11a which is the end surface of the peripheral wall portion 11, a peripheral wall step portion 14 is formed along the inner peripheral edge of the peripheral wall portion 11 of the jacket body 2. The peripheral wall step portion 14 is composed of a step bottom surface 14a and a step side surface 14b rising from the step bottom surface 14a. The step bottom surface 14a is formed at a position one step lower than the end surface 11a. The step bottom surface 14a has the same height as the end surface 12a of the support column 12.

The sealing body 3 is a plate-shaped member that seals the opening of the jacket body 2. The corners of the sealing body 3 may be right angles, but in the present embodiment, round chamfering is performed. The side surface 3c of the sealing body 3 is preferably larger than the step side surface 14b. That is, the sealing body 3 has a thickness larger than that of the step side surface 14b. The sealing body 3 is not particularly limited as long as it is a metal capable of friction stir welding, but is made of an aluminum alloy in this embodiment.

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

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

As shown in FIG. 7, the mounting step is a step of mounting the sealing body 3 on the peripheral wall stepped portion 14 formed on the jacket body 2. The stepped side surface 14b of the peripheral wall stepped portion 14 and the side surface 3c of the sealing body 3 are abutted to form the first abutting portion J1. Further, the step bottom surface 14a of the peripheral wall step portion 14 and the back surface 3b of the sealing body 3 are overlapped to form the second butt portion J2. Further, the end surface 12a of the support column 12 and the back surface 3b of the sealing body 3 are overlapped to form the fourth butt portion J4. The jacket body 2 and the sealing body 3 may be temporarily joined by welding, friction stir welding, or the like.

As shown in FIGS. 8 to 11, the first main joining step is a step of friction stir welding the first butt portion J1 using the rotary tool F. In the first main joining step, a holding step and a friction stir welding step are performed. As shown in FIG. 8, in the holding step, the jacket body 2 and the sealing body 3 are pressed from both outer sides by a holding device (jig) provided with a pair of holding portions 22 to hold the jacket body 2. In the present embodiment, an intermediate plate 21 is interposed between the holding portion 22 and the bottom portion 10 and between the holding portion 22 and the sealing body 3, respectively. The holding portion 22 has a columnar shape, and its end faces come into surface contact with the intermediate plates 21 and 21, respectively. By providing the intermediate plate 21, the pressing force of the holding portion 22 can be dispersed, and the jacket body 2 and the sealing body 3 can be reliably held. The intermediate plate 21 may be omitted.

The holding portion 22 of the holding device, the jacket body 2 and the sealing body 3 rotate or move in parallel in synchronization with each other. That is, the sandwiching device rotates the jacket body 2 and the sealing body 3 in the circumferential direction while the bottom portion 10 of the jacket body 2 and the surface 3a of the sealing body 3 are pressed and sandwiched by the holding portions 22 and 22, respectively. At the same time, it can be linearly moved up and down, left and right, and front and back.

In the first main joining step, first, the rotary tool F attached to the friction stir welder is rotated clockwise. The position of the rotary tool F is fixed so as not to move with respect to the friction stir welding device in the first main joining step of the present embodiment. That is, the rotating tool F is not displaced, and the jacket body 2 and the sealing body 3 are moved with respect to the rotating tool F, so that the rotating tool F is moved relative to the jacket body 2 and the sealing body 3. Friction stir is performed by letting it run.

Next, as shown in FIG. 8, a holding step of holding the jacket main body 2 and the sealing body 3 is performed, and the jacket main body 2 and the sealing body 3 are held by using a holding device (jig). Then, by operating the sandwiching device, as shown in FIG. 9, the rotary tool F is inserted into the start position SP1 set on the surface 3a of the sealing body 3 to perform the friction stirring step. In the friction stir welding step, the press-in section, the main section, and the detachment section are continuously subjected to friction stir welding.

As shown in FIG. 9, the closet section is a section from the start position SP1 set on the surface 3a of the sealing body 3 to the intermediate point S1 set on the first butt portion J1. This section is a section from the intermediate point S1 to the intermediate point S2 (see FIG. 11) set on the first butt portion J1 after going around the first butt portion J1 and passing through the intermediate point S1. The detachment section is a section from the intermediate point S2 to the end position EP1 (see FIG. 11) set on the surface 3a of the sealing body 3.

In the closet section, as shown in FIG. 10, the rotation tool F is arranged so that the rotation center axis Z of the rotation tool F is perpendicular to the start position SP1, and the tip side is reached to a predetermined depth while moving relative to the intermediate point S1. The pin F3 is gradually pushed in. When the rotation tool F reaches the intermediate point S1, the section shifts to this section as it is. A plasticized region W1 is formed in the movement locus of the rotation tool F.

Further, when the intermediate point S1 is reached, the outer peripheral surface of the base end side pin F2 and the surface 3a of the sealing body 3 are set to come into contact with each other. At this time, the outer peripheral surface of the base end side pin F2 may be in contact with the end surface 11a of the peripheral wall portion 11. Further, the flat surface F4 of the tip side pin F3 is set so as to penetrate the step bottom surface 14a. Then, the process shifts to friction stir welding in this section as it is.

In this section, the rotation tool F is moved while maintaining a predetermined depth while keeping the rotation center axis Z of the rotation tool F, the end surface 11a of the peripheral wall portion 11 and the surface 3a of the sealing body 3 perpendicular to each other. The jacket body 2 and the sealing body 3 are made to go around the jacket body 2 and the sealing body 3 by moving them relative to each other along the first butt portion J1. When the rotation tool F reaches the intermediate point S2, the process shifts to the departure section as it is. The predetermined depth means the depth at which the tip end side pin F3 is inserted in this section from the intermediate point S1 to the intermediate point S2 on the first butt portion J1. In the present embodiment, the predetermined depth is set so that the tip of the tip side pin F3 reaches the step bottom surface 14a, but the predetermined depth is set so that the tip of the tip side pin F3 does not come into contact with the step bottom surface 14a. It may be set.

At the corners of the jacket body 2 and the sealing body 3, the rotating tool F is relatively moved while rotating the holding portions 22 and 22. On the sides of the jacket body 2 and the sealing body 3 excluding the corners, the rotating tool F is relatively moved while the holding portions 22 and 22 are translated. In this section, the tip end side pin F3 is brought into contact with the peripheral wall portion 11 and the sealing body 3, and friction stir welding is performed so that the outer peripheral surface of the proximal end side pin F2 and the surface 3a of the sealing body 3 are in contact with each other.

In the detachment section, as shown in FIG. 11, while moving relative to the end position EP1 from the intermediate point S2, the tip side pin F3 is gradually pulled out and detached at the end position EP1. When the first main joining step is completed, the holding device is detached from the jacket body 2 and the sealing body 3.

As shown in FIG. 12, the second main joining step is a step of friction stir welding the sealing body 3 and the support column 12 using the rotary tool F. In the second main joining step, the rotating tool F is inserted vertically from the surface 3a of the sealing body 3, is relatively moved along the fourth butt portion J4 by one or more turns, and then the rotating tool F is separated from the sealing body 3. Let me. In the second main joining step, the tip end side pin F3 is brought into contact with the support column 12 of the jacket body 2 and the sealing body 3, and friction is performed so that the outer peripheral surface of the base end side pin F2 and the surface 3a of the sealing body 3 are in contact with each other. Stir. In the second main joining step, a plasticized region W2 is formed in the movement locus of the rotation tool F.

In the present embodiment, the flat surface F4 at the tip of the tip side pin F3 reaches the end face 12a of the support column 12, but the friction stir welding is performed in a state where only the tip side pin F3 and the sealing body 3 are in contact with each other. You may go. In this case, the fourth butt portion J4 is plastically fluidized and joined by the frictional heat between the tip end side pin F3 and the sealing body 3. The second joining step may be omitted.

According to the method for manufacturing a liquid-cooled jacket according to the first embodiment described above, the jacket main body is held in a state where the bottom portion 10 of the jacket main body 2 and the surface 3a of the sealing body 3 are held from both outer sides by a pair of holding portions 22. Since the 2 and the sealing body 3 are rotated or moved, the holding portion 22 and the rotating tool F do not interfere with each other during the first main joining process. That is, since the jig for positioning the jacket body 2 and the sealing body 3 is not on the movement route of the rotation tool F, the movement of the rotation tool F is not hindered. As a result, the man-hours can be reduced, the first main joining process can be easily performed, and the manufacturing cost can be reduced.

Further, according to the first joining step according to the present embodiment, since the plate thickness of the sealing body 3 is set to be larger than that of the step side surface 14b, it is possible to prevent the joint portion from becoming short of metal. ..

Further, the joining strength can be increased by performing the second joining step. In the second main joining step, if the tip end side pin F3 is brought into contact with the support column 12, the fourth butt portion J4 can be joined more reliably.

Here, the start position SP1 may be set on the first butt portion J1 and the rotation tool F may be inserted vertically to perform friction stir welding, but in this form, excessive frictional heat is generated at the start position SP1. It may occur and cause poor joining. On the other hand, as in the present embodiment, the start position SP1 is set at a position away from the first butt portion J1, and the first butt portion is gradually pushed in while being relatively moved toward the first butt portion J1. It is possible to prevent the frictional heat from becoming excessive on J1. The start position SP1 may be set on the end surface 11a of the peripheral wall portion 11.

Similarly, the end position EP1 may be set on the first butt portion J1 and the rotation tool F may be vertically detached at the end position EP1, but in this form, excessive frictional heat is generated at the end position EP1. However, there is a risk of poor joining. On the other hand, as in the present embodiment, the end position EP1 is set at a position away from the first butt portion J1 and gradually pulled out while moving relative to the first butt portion J1 on the first butt portion J1. It is possible to prevent the frictional heat from becoming excessive. The end position EP1 may be set on the end surface 11a of the peripheral wall portion 11.

Further, by setting the start position SP1 and the intermediate point S1 so that the angle formed by the straight line connecting the start position SP1 and the first butt portion J1 and the first butt portion J1 is an obtuse angle, the first butt portion J1 It is possible to prevent the relative movement of the rotation tool F from stopping or the movement speed from slowing down to generate excessive frictional heat, resulting in poor joining.
Similarly, by setting the end position EP1 and the intermediate point S2 so that the angle formed by the straight line connecting the end position EP1 and the first butt portion J1 and the first butt portion J1 is an obtuse angle, the first butt portion J1 It is possible to prevent the relative movement of the rotation tool F from stopping or the movement speed from slowing down to generate excessive frictional heat, resulting in poor joining.

Further, in the first main joining step, since the start end and the end end of the plasticized region W1 on the first butt portion J1 are overlapped, the airtightness and watertightness can be improved.

The first main joining step may be performed after the second main joining step. Further, in the closet section and the withdrawal section, the movement route may be set so that the movement locus of the rotation tool F becomes a curve. The curve is, for example, an arc shape or the like. Further, in the first joining step of the present embodiment, the position of the rotating tool F is set not to be displaced, but the rotating tool F, the jacket body 2 and the sealing body 3 (holding device) are both moved. Friction stir welding may be performed. For example, when the rotary tool F is attached to the robot arm, the robot arm, the jacket body 2 and the sealing body 3 (holding device) may both be moved to perform friction stir welding.

Further, in this joining step, the rotation speed of the rotation tool F may be constant or variable. In the indentation section of the main joining step, if the rotation speed of the rotation tool F at the start position SP1 is V1 and the rotation speed of the rotation tool F in this section is V2, V1> V2 may be satisfied. The rotation speed V2 is a preset constant rotation speed in the first butting portion J1. That is, at the start position SP1, the rotation speed may be set high, and the rotation speed may be gradually reduced in the closet section to shift to the main section.

Further, in the detachment section of the first main joining step, if the rotation speed of the rotation tool F in this section is V2 and the rotation speed of the rotation tool F when detached at the end position EP1 is V3, V3> V2 may be satisfied. That is, after shifting to the detachment section, the rotation tool F may be detached from the sealing body 3 while gradually increasing the rotation speed toward the end position EP1. By setting as described above when the rotary tool F is pushed into the sealing body 3 or separated from the sealing body 3, the small pressing force in the pushing section or the separating section can be compensated by the rotational speed. Therefore, friction stir welding can be preferably performed.

[Second Embodiment]
Next, a method for manufacturing the liquid-cooled jacket according to the second embodiment of the present invention will be described. As shown in FIG. 13, the second embodiment is mainly different from the first embodiment in that the support column 12 is provided with the support column step portion 16. In the second embodiment, the parts different from the first embodiment will be mainly described.

The jacket body 2A is composed of a bottom portion 10, a peripheral wall portion 11, and a support column 12. The bottom portion 10 and the peripheral wall portion 11 are the same as those in the first embodiment. A protrusion 15 is formed on the tip end side of the support column 12. The shape of the protruding portion 15 is not particularly limited, but in the present embodiment, it has a columnar shape. By forming the projecting portion 15, a strut step portion 16 is formed at the tip of the strut 12. The strut step portion 16 is formed with a step bottom surface 16a and a step side surface 16b rising from the step bottom surface 16a. The step bottom surface 16a is formed at the same height position as the step bottom surface 14a of the peripheral wall step portion 14.

A hole 4 is formed in the sealing body 3A. The hole 4 is formed at a position corresponding to the protrusion 15 of the support column 12. The hole 4 is formed in a size such that the protrusion 15 can be inserted.

In the method for manufacturing a liquid-cooled jacket according to the second embodiment, a preparation step, a mounting step, a first main joining step, and a second main joining step are performed. The preparation step is a step of preparing the jacket body 2A and the sealing body 3A.

As shown in FIG. 13, the mounting step is a step of mounting the sealing body 3A on the jacket body 2A. In the mounting step, the protrusion 15 of the support column 12 is inserted into the hole 4 while the sealing body 3A is mounted on the step bottom surface 14a of the peripheral wall step portion 14. The stepped side surface 14b of the peripheral wall stepped portion 14 and the side surface 3c of the sealing body 3A are abutted to form the first abutting portion J1. Further, the step bottom surface 14a of the peripheral wall step portion 14 and the back surface 3b of the sealing body 3A are overlapped to form the second butt portion J2. Further, the step side surface 16b of the support column 12 and the hole wall 4a of the hole portion 4 are abutted to form a step side surface butt portion J12 (third butt portion). Further, the step bottom surface 16a of the support column 12 and the back surface 3b of the sealing body 3A are overlapped to form a step bottom surface butt portion J13 (fourth butt portion). The thickness of the sealing body 3A is larger than the height dimension of the step side surface 14b of the peripheral wall step portion 14 and the step side surface 16b of the support column 12.

The first main joining step is the same as that of the first embodiment. In the second main joining step, the tip side pin F3 of the rotation tool F is inserted into the step side surface butt portion J12 and the step bottom surface butt portion J13, and the rotation tool F is relatively moved one or more turns along the step side surface butt portion J12. In the present embodiment, the insertion depth is set so that the flat surface F4 at the tip of the tip side pin F3 reaches the step bottom surface 16a of the support column 12. In the second main joining step, a plasticized region W2 is formed in the movement locus of the rotation tool F. In the second joining step, the flat surface F4 at the tip of the rotation tool F may be set so as not to come into contact with the step bottom surface 16a of the support column 12.

According to the second joining step according to the present embodiment described above, the jacket body 2A and the sealing body 3A can be positioned by inserting the hole 4 of the sealing body 3A into the protruding portion 15 of the support column 12. It can be done easily. Further, since the plate thickness of the sealing body 3A is set to be larger than that of the step side surface 16b of the support column 12, it is possible to prevent the joint portion from becoming short of metal.

The method for manufacturing the liquid-cooled jacket according to the second embodiment described above can also achieve substantially the same effect as that of the first embodiment. Further, although the embodiments of the present invention have been described above, the design can be appropriately changed within a range not contrary to the gist of the present invention. Further, in the first main joining step, the start position SP1 and the end position EP1 may be set on the first butt portion J1. Also in this case, in the closet section, it is preferable to perform friction stir while gradually pushing in while moving the rotary tool F relative to each other. Further, in the detachment section, it is preferable to perform friction stir while gradually pulling out the rotating tool F while moving it relative to each other. By doing so, it is possible to prevent the frictional heat from becoming excessive at one point on the first butt portion J1.

1 Liquid-cooled jacket 2 Jacket body 3 Encapsulant 10 Bottom 11 Peripheral wall 22 Holding F Rotating tool F2 Base end side pin F3 Tip side pin J1 First butt part J2 Second butt part J12 Step side butt part J13 Step bottom butt Part SP1 Start position EP1 End position W1 Plasticization area

Claims (8)

The jacket body is composed of a bottom portion, a peripheral wall portion rising from the peripheral edge of the bottom portion, a jacket main body having a support column rising from the bottom portion, and a sealing body for sealing an opening of the jacket main body. A method for manufacturing a liquid-cooled jacket that is joined by friction stir welding.
The rotary tool used for friction stir welding has a base end side pin and a tip end side pin.
The taper angle of the base end side pin is larger than the taper angle of the tip end side pin, and a stepped step portion is formed on the outer peripheral surface of the base end side pin.
The jacket body having a peripheral step portion having a step bottom surface and a step side surface rising from the step bottom surface toward the opening on the inner peripheral edge of the peripheral wall portion, and a thickness larger than the height of the step side surface. The preparatory step for preparing the sealed body to have, and
By placing the sealing body on the jacket body, the stepped side surface of the peripheral wall portion and the side surface of the sealing body are abutted to form a first abutting portion, and the stepped bottom surface of the peripheral wall portion and the sealing body are formed. A mounting step of forming a second butt portion by superimposing the back surface of the support and forming a fourth butt portion by superimposing the end surface of the support column and the back surface of the sealing body.
The tip end side pin of the rotating tool is inserted into the first abutting portion, and the outer peripheral surface of the base end side pin is at least sealed while the tip end side pin is in contact with the peripheral wall portion and the sealing body. A first joint in which the first butt portion is frictionally agitated by making a relative rotation along the first butt portion at a predetermined depth along the first butt portion in a state of being in contact with the surface of the stop body. Including the process,
In the first main joining step, the bottom of the jacket body and the surface of the sealing body are pressed and held by a pair of holding portions from both outer sides, and the jacket body and the sealing are used by using the holding portions. A method for producing a liquid-cooled jacket, which comprises rotating or translating a stop body to frictionally stir the jacket body and the sealing body. The tip side pin of the rotating tool is inserted from the surface of the seal body, and the base end side pin is brought into contact with only the seal body or the seal body and the support column. A second joining step of frictionally agitating the fourth butt portion by relatively moving the rotating tool with the outer peripheral surface of the sealing body in contact with the surface of the sealing body is further included. The method for manufacturing a liquid-cooled jacket according to claim 1. A jacket body having a bottom portion, a peripheral wall portion rising from the peripheral edge of the bottom portion, and a support column rising from the bottom portion, and a sealing body provided with a hole into which the tip of the support column is inserted and sealing an opening of the jacket body. It is a method for manufacturing a liquid-cooled jacket, which is configured and joins the jacket body and the sealing body by friction stir welding.
The rotary tool used for friction stir welding has a base end side pin and a tip end side pin.
The taper angle of the base end side pin is larger than the taper angle of the tip end side pin, and a stepped step portion is formed on the outer peripheral surface of the base end side pin.
A peripheral wall step portion having a step bottom surface and a step side surface rising from the step bottom surface toward the opening is formed on the inner peripheral edge of the peripheral wall portion, and the step bottom surface of the support column and the support column are formed at the tip of the support column. A preparatory step for preparing the jacket body having a support step portion having a step side surface of the support rising from the step bottom surface, and the sealing body having a thickness larger than the height of the step side surface.
By placing the sealing body on the jacket body, the stepped side surface of the peripheral wall portion and the side surface of the sealing body are abutted to form a first abutting portion, and the stepped bottom surface of the peripheral wall portion and the sealing body are formed. The back surface of the column is overlapped to form a second butt portion, and the step side surface of the column and the hole wall of the hole portion are abutted to form a third butt portion. The mounting process of forming the fourth butt portion by superimposing the back surface of the
The tip end side pin of the rotating tool is inserted into the first abutting portion, and the outer peripheral surface of the base end side pin is at least sealed while the tip end side pin is in contact with the peripheral wall portion and the sealing body. A first joint in which the first butt portion is frictionally agitated by making a relative rotation along the first butt portion at a predetermined depth along the first butt portion in a state of being in contact with the surface of the stop body. Including the process,
In the first main joining step, the bottom of the jacket body and the surface of the sealing body are pressed and held by a pair of holding portions from both outer sides, and the jacket body and the sealing are used by using the holding portions. A method for producing a liquid-cooled jacket, which comprises rotating or translating a stop body to frictionally stir the jacket body and the sealing body. The tip end side pin of the rotating tool is inserted into the third butt portion, and the outer peripheral surface of the base end side pin is at least the sealant while the tip end side pin is in contact with the sealing body and the support column. The liquid-cooled jacket according to claim 3, further comprising a second joining step of frictionally agitating the third butt portion by relatively moving the rotating tool in contact with the surface of the jacket. Production method. The method for manufacturing a liquid-cooled jacket according to claim 2 or 4, wherein the second joining step is performed after the first joining step. The method for manufacturing a liquid-cooled jacket according to claim 2 or 4, wherein the first main joining step is performed after the second main joining step. In the first main joining step, the rotary tool is rotated at a predetermined rotation speed to perform friction stir welding.
Claims 1 to 1, wherein when the tip end side pin is detached in the first main joining step, the rotation tool is relatively moved to the end position while gradually increasing the rotation speed from the predetermined rotation speed. Item 6. The method for manufacturing a liquid-cooled jacket according to any one of items 6. In the first main joining step, the rotary tool is rotated at a predetermined rotation speed to perform friction stir welding.
When the tip side pin is inserted in the first main joining step, the tip side pin is inserted in a state of being rotated at a speed higher than the predetermined rotation speed, and the first butting is performed while gradually reducing the rotation speed. The method for manufacturing a liquid-cooled jacket according to any one of claims 1 to 7, wherein the liquid-cooled jacket is relatively moved to a portion.

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