JP2017159351A - Manufacturing method of liquid-cooled jacket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a liquid-cooled jacket capable of preventing a joined part from metal shortage as well as allowing easy deburring.SOLUTION: A manufacturing method of a liquid-cooled jacket comprises: a preparation step for preparing a jacket body 2 having a sealing body 3 and a frame-like peripheral wall part 11; an abutting step for placing the sealing body 3 in a step difference part 15a and forming an abutting part J1 in which a step difference side part 15b abutting a side surface 21c of the sealing body 3; an arranging step for arranging an auxiliary member 30 at an inner corner constituted of a peripheral wall part 11 and the sealing body 3; a friction agitation step for inserting a rotary tool F for joining into the inner corner, and performing friction agitation at the abutting part J1 with only an agitation pin F2 contacting the jacket body 2, the sealing body 3, and the auxiliary member 30; and a removal step for removing the auxiliary member 30 on which burrs are formed, wherein in the friction agitation step, the rotary tool F for joining, is moved one round along the inner corner around the sealing body 3.SELECTED DRAWING: Figure 9

Description

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

  Friction stir welding (FSW = Friction Stir Welding) is known as a method for joining metal members. Friction stir welding is a method in which the metal members are fixed together by rotating the rotary tool along the abutting portion between the metal members and plastically flowing the metal at the abutting portion by frictional heat between the rotating tool and the metal member. Phase joining is performed.

  In recent years, as the performance of electronic devices typified by personal computers has improved, the amount of heat generated by a mounted CPU (heating element) has increased, and cooling of the CPU has become important. Conventionally, air-cooled fan type heat sinks have been used to cool CPUs, but problems such as fan noise and cooling limit in air-cooled systems have come to be highlighted. The jacket is drawing attention.

  As a method for manufacturing such a liquid cooling jacket, Patent Document 1 discloses a technique for joining metal components by friction stir welding. A conventional liquid cooling jacket is composed of a box-shaped jacket body that is open at the top and a plate-shaped sealing body that seals the opening of the jacket body.

  In the conventional method for manufacturing a liquid cooling jacket, a plate-shaped sealing body is placed on the stepped portion of the jacket body, and a stirring pin of a rotating tool is inserted from an inner corner formed by the jacket body and the sealing body, The rotating tool is rotated around the sealing body.

Japanese Patent Laid-Open No. 2006-2558

  In the conventional method for manufacturing a liquid cooling jacket, since frictional stirring is performed with only the stirring pin inserted in the inner corner, the plastic fluid material may overflow to the outside, and the joint may become insufficient in metal. Further, since the metal is not pressed by the shoulder portion of the rotary tool, a lot of burrs are generated, and there is a problem that the process of removing the burrs becomes complicated.

  Then, this invention makes it a subject to provide the manufacturing method of the liquid cooling jacket which can remove a burr | flash easily while preventing the metal shortage of a junction part.

  In order to solve the above-mentioned problem, the present invention is a method for manufacturing a liquid cooling jacket comprising a jacket body having a recess through which a heat transport fluid flows and a sealing body that seals the opening of the recess. A step bottom surface having a bottom portion and a frame-shaped peripheral wall portion rising from a peripheral edge of the bottom portion, the step bottom surface formed at a position one step lower than an end surface of the peripheral wall portion, and the step bottom surface A step of preparing the jacket body including a step side surface rising from the step side, placing the sealing body having a thickness larger than the height dimension of the step side surface on the step bottom surface, A butting step of forming a butting portion in which the side surface of the sealing body is butted, a disposing step of disposing an auxiliary member at an inner corner formed by an end surface of the peripheral wall portion and a side surface of the sealing body, Rotation with a stirring pin in the inner corner A friction stir process in which friction stir is performed on the abutting portion in a state where only a stirring pin is in contact with the jacket body, the sealing body and the auxiliary member, and the auxiliary member in which a burr is formed Removing from at least one of the jacket body and the sealing body, and in the friction stirring step, the rotating tool is made to make a round around the sealing body along the inner corner. It is characterized by joining parts.

  According to such a manufacturing method, the auxiliary member is disposed in the inner corner, and the auxiliary member in addition to the jacket main body and the sealing body is frictionally stirred at the same time, so that the metal shortage of the joint portion can be prevented. Further, since the burr can be removed together with the auxiliary member by the removing step, the burr can be easily removed.

  Moreover, it is preferable to set joining conditions so that the said burr | flash generate | occur | produces in the said auxiliary member in the said friction stirring process. According to this manufacturing method, burrs can be removed more easily.

  Further, in the friction stirring step, it is preferable to perform the friction stirring in a state where the rotation center axis of the rotary tool is inclined outward. According to this manufacturing method, the rotary tool can be easily inserted into the inner corner.

  Further, in the preparation step, a support portion provided with an end surface flush with the step bottom surface and a protruding portion protruding from the support portion are formed on the bottom portion, and a concave groove is formed on the back surface of the sealing body, In the butting step, the sealing body is placed while inserting the protruding portion into the concave groove, and in the friction stirring step, the fitting portion in which the protruding portion and the concave groove are fitted to each other. Friction stirring is preferably performed in a state where only the stirring pin of the rotary tool is in contact with only the sealing body or with the protruding portion and the sealing body.

  According to this manufacturing method, since the sealing body is supported by the support portion and the support portion and the sealing body are also friction stir welded, the strength of the liquid cooling jacket can be increased. Moreover, the positioning work of the sealing body can be easily performed by inserting the protruding portion into the concave groove.

  Further, the support portion extends from the peripheral wall portion, and in the friction stirring step, after the friction stir of the fitting portion, the support portion is moved as it is to the peripheral wall portion, and the It is preferable to release the rotating tool.

  According to such a manufacturing method, since the punching hole of the stirring pin is formed at a position away from the concave portion of the jacket body, it is possible to improve the water tightness and air tightness of the liquid cooling jacket.

  According to the method for manufacturing a liquid cooling jacket according to the present invention, it is possible to prevent a metal shortage at a joint portion and to easily remove burrs.

It is a disassembled perspective view of the liquid cooling jacket which concerns on 1st embodiment of this invention. It is a perspective view which shows the butt | matching process of the manufacturing method of the liquid cooling jacket which concerns on 1st embodiment. It is sectional drawing which shows the butt | matching process of the manufacturing method of the liquid cooling jacket which concerns on 1st embodiment. It is a perspective view which shows the auxiliary member of the manufacturing method of the liquid cooling jacket which concerns on 1st embodiment. It is a perspective view which shows the arrangement | positioning process of the manufacturing method of the liquid cooling jacket which concerns on 1st embodiment. It is a perspective view which shows the 1st friction stirring process of the manufacturing method of the liquid cooling jacket which concerns on 1st embodiment. It is sectional drawing which shows the 1st friction stirring process of the manufacturing method of the liquid cooling jacket which concerns on 1st embodiment. It is a perspective view which shows the 2nd friction stirring process of the manufacturing method of the liquid cooling jacket which concerns on 1st embodiment. It is sectional drawing which shows the 2nd friction stirring process of the manufacturing method of the liquid cooling jacket which concerns on 1st embodiment. It is a perspective view which shows the removal process of the manufacturing method of the liquid cooling jacket which concerns on 1st embodiment. It is sectional drawing which shows the removal process of the manufacturing method of the liquid cooling jacket which concerns on 1st embodiment. It is a perspective view which shows the auxiliary member of the manufacturing method of the liquid cooling jacket which concerns on 2nd embodiment. It is a perspective view which shows the arrangement | positioning process of the manufacturing method of the liquid cooling jacket which concerns on 2nd embodiment. It is a perspective view which shows the 1st friction stirring process and the 2nd friction stirring process of the manufacturing method of the liquid cooling jacket which concerns on 2nd embodiment. It is sectional drawing which shows the 2nd friction stirring process of the manufacturing method of the liquid cooling jacket which concerns on 2nd embodiment. It is sectional drawing which shows the removal process of the manufacturing method of the liquid cooling jacket which concerns on 2nd embodiment.

[First embodiment]
A manufacturing method of a liquid cooling jacket and a liquid cooling jacket according to a first embodiment of the present invention will be described in detail with reference to the drawings. In the manufacturing method of the liquid cooling jacket according to the present embodiment, as shown in FIG. 1, a preparation process, a butting process, an arranging process, a friction stirring process, and a removing process are performed. In the following description, “front surface” means a surface opposite to the “back surface”.

  The preparation step is a step of preparing the jacket body 2 and the sealing body 3. The jacket body 2 includes a bottom portion 10, a peripheral wall portion 11, and a support portion 12. The material of the jacket body 2 may be any metal that can be frictionally stirred, but is formed of a metal that can be frictionally stirred, such as aluminum, aluminum alloy, copper, copper alloy, titanium, titanium alloy, magnesium, and magnesium alloy. . The jacket body 2 is a box-shaped member that is open at the top. The bottom 10 has a rectangular shape in plan view. The peripheral wall portion 11 rises from the periphery of the bottom portion 10 and has a rectangular frame shape.

  The peripheral wall part 11 is comprised by wall part 11A, 11B, 11C, 11D. The walls 11A and 11B are opposed to each other and are short sides. The walls 11C and 11D are opposed to each other and are long sides. A recess 13 is formed inside the jacket body 2. A step portion 15 is formed on the inner peripheral edge of the end surface 11 a of the peripheral wall portion 11. The step portion 15 includes a step bottom surface 15a formed at a position lower than the end surface 11a and a step side surface 15b rising from the step bottom surface 15a.

  The support portion 12 rises from the bottom portion 10 and extends from the wall portion 11 </ b> B of the peripheral wall portion 11. The support portion 12 may be formed away from the peripheral wall portion 11 or may be omitted. The end surface 12a of the support part 12 is flush with the step bottom surface 15a. A protruding portion 12 b is formed on the end surface 12 a of the support portion 12. The protrusion 12b has a cylindrical shape in the present embodiment. The protruding portion 12 b is a portion that is fitted to the sealing body 3.

  The sealing body 3 is a metal member that covers the opening of the jacket body 2. The material of the sealing body 3 is not particularly limited, but is formed of the same material as that of the jacket body 2 in the present embodiment. The sealing body 3 includes a main body portion 21 and a plurality of fins 22.

  The main body 21 is a plate-like member having a rectangular shape in plan view. The main body portion 21 is a part placed on the step portion 15. The plate | board thickness dimension of the main-body part 21 is larger than the height dimension of the level | step difference side surface 15b. In this embodiment, the plate | board thickness dimension of the main-body part 21 is about 2 times the height dimension of the level | step difference side surface 15b. The fins 22 are plate-like members formed on the back surface 21 b of the main body 21. A plurality of fins 22 are formed at predetermined intervals.

  Three concave grooves 23 are formed on the back surface 21 b of the main body 21. The concave groove 23 is formed so that the protruding portion 12b is inserted at a position corresponding to the protruding portion 12b. In this embodiment, the hollow portion of the concave groove 23 has a cylindrical shape, but may be any shape as long as the protruding portion 12b can be inserted.

  The butting process is a process of butting the jacket body 2 and the sealing body 3 as shown in FIG. As shown in FIG. 3, in the butting process, the sealing body 3 is placed on the step portion 15 of the jacket body 2. The side face 21c of the main body 21 and the step side face 15b are abutted to form the abutting portion J1. Further, the back surface 21b of the main body 21 and the step bottom surface 15a are overlapped. The butting portion J1 is formed over the entire circumference of the sealing body 3. Further, an inner corner is formed by the end surface 11 a of the peripheral wall portion 11 and the four side surfaces 21 c of the main body portion 21. In the butting step, the recessed groove 23 of the sealing body 3 is fitted into the protruding portion 12 b of the support portion 12. Thereby, the fitting part J2 is formed.

  The placement step is a step of placing the auxiliary member 30 on the jacket body 2 as shown in FIG. The auxiliary member 30 is a plate-like member in which a hollow portion 31 having a rectangular shape in plan view is formed. The plate thickness dimension of the auxiliary member 30 is appropriately set to such an extent that a metal shortage does not occur at the joint in the second friction stirring step described later. The hollow portion 31 has the same shape as the planar shape of the sealing body 3. The material of the auxiliary member 30 is not particularly limited as long as it is a metal that can be frictionally stirred, but in the present embodiment, the material is the same as that of the jacket body 2 and the sealing body 3. A slit 32 continuous in the width direction is formed in a part of the auxiliary member 30.

  In the arranging step, the auxiliary member 30 is arranged on the end surface 11a of the peripheral wall portion 11 as shown in FIG. Thereby, the end surface 11 a is covered with the auxiliary member 30. The inner peripheral edge of the auxiliary member 30 is in surface contact with the side surface 21c of the main body 21 or is disposed with a fine gap. In the present embodiment, the entire end surface 11a is covered with the auxiliary member 30, but the size of the auxiliary member 30 may be adjusted so that a part of the end surface 11a is covered.

  The friction stir process is a process in which the jacket main body 2 and the sealing body 3 are subjected to friction stir welding using the welding rotary tool F. As shown in FIGS. 6 and 7, the joining rotary tool F includes a connecting portion F <b> 1 and a stirring pin F <b> 2. The joining rotary tool F corresponds to a “rotary tool” in the claims. The joining rotary tool F is made of, for example, tool steel. The connecting part F1 is a part connected to a rotating shaft (not shown) of the friction stirrer. The connecting portion F1 has a cylindrical shape.

  The stirring pin F2 hangs down from the connecting portion F1 and is coaxial with the connecting portion F1. The stirring pin F2 is tapered as it is separated from the connecting portion F1. A spiral groove is formed on the outer peripheral surface of the stirring pin F2. In the present embodiment, the spiral groove is formed in a counterclockwise direction from the proximal end toward the distal end in order to rotate the joining rotary tool F to the right. In other words, the spiral groove is formed counterclockwise as viewed from above when the spiral groove is traced from the proximal end to the distal end.

  In addition, when rotating the rotation tool F for joining counterclockwise, it is preferable to form a spiral groove clockwise as it goes to a front-end | tip from a base end. In other words, the spiral groove in this case is formed clockwise when viewed from above when the spiral groove is traced from the proximal end to the distal end. By setting the spiral groove in this way, the metal plastically fluidized during friction stirring is guided to the tip side of the stirring pin F2 by the spiral groove. Thereby, the quantity of the metal which overflows to the exterior of a to-be-joined metal member (the jacket main body 2, the sealing body 3, and the auxiliary member 30) can be decreased. The spiral groove may be omitted.

  The joining rotary tool F may be attached to a friction stirrer such as a machining center, but may be attached to, for example, an arm robot having a rotating means such as a spindle unit at the tip. By attaching the joining rotary tool F to the arm robot, the inclination angle of the rotation center axis Fc of the joining rotary tool F can be easily changed.

  In the friction stirring process of the present embodiment, a first friction stirring process and a second friction stirring process are performed. The first friction stirring step is a step of joining the support portion 12 and the sealing body 3 together. As shown in FIG. 6, in the first friction agitation step, the agitation pin F2 of the rotating tool F for bonding rotated to the right is inserted into the start position Sp1 set on the surface 21a of the sealing body 3, and the wall 11B The auxiliary member 30 is relatively moved toward the end position Ep1 set. As shown in FIG. 7, in the first friction stirring step, the stirring pin F2 reaches the protruding portion 12b, or the protruding portion 12b and the groove 23 are in contact with the stirring pin F2 only in the sealing body 3. Friction stir welding is performed on the fitting portion J2. A plasticized region W1 is formed in the movement locus of the welding rotary tool F. When the joining rotary tool F reaches the end position Ep1, the joining rotary tool F is once detached. At this time, a punch hole of the bonding rotary tool F is formed, but overlay welding may be performed on the punch hole. Alternatively, the joining rotary tool F may be gradually pulled out so as not to form a punched hole.

  The second friction stirring step is a step of joining the peripheral wall portion 11 and the sealing body 3. As shown in FIG. 8, first, the stirring pin F2 of the rotating tool for welding F rotated to the right is inserted into the start position Sp2 set on the auxiliary member 30, and is relatively moved toward the inner corner. When the stirring pin F2 reaches the inner corner, as shown in FIG. 9, the rotation center axis Fc of the bonding rotary tool F is inclined outward. And the rotating tool F for joining is relatively moved over the circumference | surroundings of the sealing body 3 in the inclined state, and the butt | matching part J1 is friction-stir-welded. A plasticized region W2 is formed in the movement locus of the welding rotary tool F.

  In the second friction stirring step, only the stirring pin F2 rotated to the right is inserted into the butting portion J1, and the metal member to be joined and the connecting portion F1 are moved relative to each other while being separated from each other. In other words, the friction stir welding is performed with the base end portion of the stirring pin F2 exposed. And the rotation tool F for joining is relatively moved along the abutting part J1 in the state which made the jacket main body 2, the sealing body 3, the auxiliary member 30, and the stirring pin F2 contact.

  In this embodiment, the advancing direction of the joining rotary tool F is set so that the auxiliary member 30 is positioned on the right side in the advancing direction of the joining rotary tool F. The rotation direction and the traveling direction of the joining rotary tool F are not limited to those described above, and may be set as appropriate. For example, the joining rotary tool F may be rotated counterclockwise while the auxiliary member 30 is disposed on the right side in the traveling direction of the joining rotary tool F. Alternatively, the auxiliary member 30 may be arranged on the left side in the traveling direction of the joining rotary tool F, and the joining rotary tool F may be rotated to the left or right. The preferable positional relationship between the auxiliary member 30 and the conditions such as the rotation direction of the joining rotary tool F will be described later.

  What is necessary is just to set the insertion depth of the stirring pin F2 so that the stirring pin F2 and the butt | matching part J1 may contact. As shown in FIG. 8, when the rotating tool F for welding is made to make a round around the sealing body 3 and the plasticizing region W <b> 2 is overlapped, the rotating tool F for bonding is set at the end position Ep <b> 2 set in the auxiliary member 30. To leave.

  The removing step is a step of removing the auxiliary member 30 from the jacket body 2 as shown in FIG. The auxiliary member 30 turns up the end portion of the auxiliary member 30 with the slit 32 (see FIG. 8) as a boundary, and bends the auxiliary member 30 in a direction away from the end surface 11a of the peripheral wall portion 11 as shown in FIG. Then, the auxiliary member 30 is removed from the peripheral wall portion 11. The liquid cooling jacket 1 is formed by the above manufacturing method.

  The liquid cooling jacket 1 is a metal hollow member having a hollow portion. By circulating a heat transport fluid (for example, water) through the hollow portion of the liquid cooling jacket 1, heat exchange can be performed with a heating element (not shown) installed in the jacket body 2 or the sealing body 3. Moreover, since the liquid cooling jacket 1 which concerns on this embodiment has the several fin 22 formed, it can improve heat exchange efficiency.

  According to the liquid cooling jacket manufacturing method and the liquid cooling jacket described above, the auxiliary member 30 is disposed in the inner corner, and the auxiliary member 30 is simultaneously frictionally stirred in addition to the jacket body 2 and the sealing body 3 to thereby join the joint portion It is possible to prevent metal shortage in (plasticized region W2). Further, since the burr V can be removed together with the auxiliary member 30 by the removing step, the burr V can be easily removed.

  Further, in the second friction stirring step, by performing friction stirring with the rotation center axis Fc of the bonding rotary tool F inclined to the outside of the sealing body 3, the bonding rotary tool F can be easily placed in the inner corner. Can be inserted. In addition, although the support portion 12 may be omitted, the support portion 12 is provided as in the present embodiment, and the support portion 12 (protrusion portion 12b) and the sealing body 3 are joined, so that the liquid cooling jacket 1 is provided. Strength can be increased. Moreover, since the protrusion part 12b of the support part 12 was fitted in the concave groove 23 of the sealing body 3 in the butt | matching process, the positioning operation | work of the sealing body 3 can be performed easily. Moreover, the position shift of the sealing body 3 can be prevented in the first friction stirring step.

  Further, in the first friction stirring step, the end position (detachment position) Ep1 of the welding rotary tool F is set on the peripheral wall portion 11, so that a hole for the stirring pin F2 is formed at a position away from the recess 13. Therefore, the water tightness and air tightness of the liquid cooling jacket 1 can be improved.

  Moreover, according to this embodiment, although the burr | flash V is formed in the auxiliary member 30 by a 2nd friction stirring process, it can remove with the auxiliary member 30 in a removal process. Thereby, the operation | work which removes the burr | flash V can be performed easily. Although the auxiliary member 30 may use a removing device or the like, in this embodiment, the auxiliary member 30 can be easily removed manually.

  Moreover, in this embodiment, since only the stirring pin F2 is made to contact with a to-be-joined metal member, the load which acts on a friction stirring apparatus can be reduced compared with the case where the shoulder part of a rotary tool is made to contact. Further, since the friction stir is performed in a state where only the stirring pin F2 of the rotating tool F for bonding is in contact with the jacket body 2 and the sealing body 3, the stirring pin F2 can be inserted to a deep position of the abutting portion J1. Thereby, the jacket main body 2 and the sealing body 3 can be joined suitably.

  Further, as shown in FIG. 9, in the second friction agitation process according to the present embodiment, the auxiliary member 30 is arranged on the right side in the traveling direction and the rotating tool F for rotation is rotated to the right, so the auxiliary member 30 side becomes the Re side. . The Re side is the side on which the magnitude of the feed speed is subtracted from the magnitude of the tangential speed on the outer circumference of the welding rotary tool F. On the other hand, the side opposite to the Re side is the Ad side. The Ad side is a side where the magnitude of the feed speed is added from the magnitude of the tangential speed on the outer periphery of the welding rotary tool F.

  For example, when the rotational speed of the rotating tool F for bonding is slow, the temperature of the plastic fluidized material is likely to rise more on the Ad side than on the Re side of the plasticizing region W2, so that more burrs V are generated on the Ad side. Tend to. On the other hand, for example, when the rotational speed of the bonding rotary tool F is high, the temperature of the plastic fluidized material increases on the Ad side, but there is a tendency that more burrs V are generated on the Re side due to the higher rotational speed.

  In the present embodiment, since the rotational speed of the joining rotary tool F is set to be high, burrs V are generated on the Re side, that is, on the auxiliary member 30 side. That is, in the present embodiment, the rotational speed, the rotational direction, the traveling direction, and the like of the joining rotary tool F are set so that many burrs V are formed on the auxiliary member 30 side. Thereby, since the burr | flash V formed in the auxiliary member 30 is removed with the auxiliary member 30, the burr | flash removal process can be performed more easily. Moreover, the moving speed (feeding speed) of the joining rotary tool F can be increased by setting the rotational speed of the joining rotary tool F faster. Thereby, a joining cycle can be shortened.

  As described above, in the friction stirring step, which side of the traveling direction of the welding rotary tool F the burr V is generated varies depending on the joining conditions. The joining conditions include the rotational speed, rotational direction, moving speed (feed speed) of the rotating tool F for joining, the inclination angle (taper angle) of the stirring pin F2, the material of the jacket body 2, the sealing body 3, and the auxiliary member 30. The thickness of each member is determined by each element and the combination of these elements. It is preferable to arrange the auxiliary member 30 on the side where the burrs V are generated or on the side where many burrs V are generated, depending on the joining conditions, because the burr removing step can be easily performed.

  Moreover, since the slit 32 is provided in the auxiliary member 30, the auxiliary member 30 can be easily removed from the slit 32 as a starting point in the removal step.

  Moreover, according to the liquid cooling jacket 1 which concerns on this embodiment, since the sealing body 3 with a large thickness dimension is used, it can prevent that the sealing body 3 deform | transforms by friction heat. Moreover, like the 2nd friction stirring process of this embodiment, the water-tightness and airtightness of the liquid cooling jacket 1 can be improved more by making the start end and terminal end side of the plasticization area | region W2 overlap (overlap). it can.

[Second Embodiment]
Next, the manufacturing method of the liquid cooling jacket which concerns on 2nd embodiment is demonstrated. In the joining method according to the present embodiment, a preparation process, a butting process, an arranging process, a friction stirring process, and a removing process are performed. As shown in FIG. 12, the second embodiment is mainly different from the first embodiment in that the auxiliary member 40 is brought into surface contact with the side surface 21 c of the sealing body 3. In the description according to the present embodiment, the description will focus on parts that are different from the first embodiment.

  Since the preparation process is the same as that of the first embodiment, description thereof is omitted. The butting process is a process in which the jacket body 2 and the sealing body 3 are butted together to form the butting portion J1 in the same manner as in the first embodiment. As shown in FIG. 12, an inner corner is formed by the end surface 11 a of the peripheral wall portion 11 and the side surface 21 c of the sealing body 3.

  An arrangement | positioning process is a process of arrange | positioning the auxiliary member 40 in an inner corner. The auxiliary member 40 is a frame-shaped member including a hollow portion 41 having a rectangular shape in plan view. The plate | board thickness of the auxiliary member 40 is suitably set so that a joining part may not become metal shortage in the 2nd friction stir welding mentioned later. The hollow portion 41 has the same shape as the planar shape of the main body portion 21. In the arranging step, as shown in FIG. 13, the end surface of the auxiliary member 40 is brought into contact with the end surface 11 a of the peripheral wall portion 11, and the inner peripheral surface of the auxiliary member 40 is brought into surface contact with the four side surfaces 21 c of the main body portion 21.

  The height dimension of the auxiliary member 40 is the same as the height dimension of the portion of the side surface 21c of the main body 21 that is exposed to the outside. In the present embodiment, the entire side surface 21c is covered with the auxiliary member 40, but a part thereof may be covered.

  As shown in FIGS. 14 and 15, the friction stirring step is a step of friction stir welding the jacket main body 2 and the sealing body 3 using the rotating tool F for bonding. In the friction stirring process according to the present embodiment, a first friction stirring process and a second friction stirring process are performed. Since the first friction stirring step is the same as that of the first embodiment, detailed description thereof is omitted.

  The second friction stirrer step is a step of friction stir welding the peripheral wall portion 11 of the jacket body 2 and the sealing body 3 using the bonding rotary tool F. First, the stirring pin F2 of the rotating tool for welding F rotated counterclockwise is inserted into the start position Sp2 set on the end surface 11a of the peripheral wall portion 11, and is relatively moved toward the inner corner. When the stirring pin F2 reaches the inner corner, the rotation center axis Fc of the welding rotary tool F is inclined outward as shown in FIG. And the rotating tool F for joining is relatively moved over the circumference | surroundings of the sealing body 3 in the inclined state, and the butt | matching part J1 is friction-stir-welded. A plasticized region W2 is formed in the movement locus of the welding rotary tool F.

  In the second friction stirring step, only the stirring pin F2 rotated counterclockwise is inserted into the butting portion J1, and the metal member to be joined and the connecting portion F1 are moved relative to each other while being separated from each other. In other words, the friction stir welding is performed with the base end portion of the stirring pin F2 exposed. And the rotation tool F for joining is relatively moved along the abutting part J1 in the state which contacted the jacket main body 2, the sealing body 3, and the auxiliary member 40, and the stirring pin F2.

  In the present embodiment, the traveling direction of the joining rotary tool F is set so that the auxiliary member 40 is located on the left side in the traveling direction of the joining rotary tool F. Further, the rotational speed of the joining rotary tool F is rotated at such a high speed that burrs V are generated on the Re side. What is necessary is just to set the insertion depth of the stirring pin F2 so that the stirring pin F2 and the butt | matching part J1 may contact. As shown in FIG. 14, when the joining rotary tool F is made to make a round around the sealing body 3 to overlap the plasticized region W <b> 2, the joining rotary tool F is joined at the end position Ep <b> 2 set on the end surface 11 a of the peripheral wall portion 11. Release the rotary tool F.

  The removal step is a step of removing the auxiliary member 40 from the sealing body 3 as shown in FIG. In the removing step, the auxiliary member 40 is bent in a direction away from the side surface 21 c of the sealing body 3 to remove the auxiliary member 40 from the sealing body 3. The liquid cooling jacket 1 is formed by the above process.

  According to the joining method according to the present embodiment, the jacket body 2 and the sealing body 3 are joined, and in addition to the jacket body 2 and the sealing body 3, the auxiliary member 40 is also joined by friction stir welding at the same time. It is possible to prevent metal shortage in the portion (plasticization region W2).

  Moreover, according to this embodiment, although the burr | flash V is formed in the auxiliary member 40 by a friction stirring process, it can remove with the auxiliary member 40 in a removal process. Thereby, the operation | work which removes the burr | flash V can be performed easily. Although the auxiliary member 40 may use a removing device or the like, in the present embodiment, the auxiliary member 40 can be easily removed manually. Moreover, in this embodiment, since only the stirring pin F2 is made to contact with a to-be-joined metal member, the load which acts on a friction stirring apparatus can be reduced compared with the case where the shoulder part of a rotary tool is made to contact.

  Further, as shown in FIG. 15, in the second friction stirring step according to the present embodiment, the auxiliary member 40 is arranged on the left side in the traveling direction of the welding rotary tool F, and the auxiliary rotating tool F is rotated counterclockwise. The member 40 side is the Re side. In the present embodiment, since the rotational speed of the joining rotary tool F is set to be high, burrs V are generated on the Re side, that is, on the auxiliary member 40 side. That is, in this embodiment, the rotational speed, the rotational direction, the traveling direction, and the like of the bonding rotary tool F are set so that the burr V is formed on the auxiliary member 40 side. Thereby, since the burr | flash V formed in the auxiliary member 40 is removed with the auxiliary member 40, the burr removal process can be performed more easily. Moreover, the moving speed (feeding speed) of the joining rotary tool F can be increased by setting the rotational speed of the joining rotary tool F faster. Thereby, a joining cycle can be shortened. Moreover, you may arrange | position the auxiliary member 40 to an inner corner so that the side surface 21c of the sealing body 3 may be followed like the arrangement | positioning process of this embodiment.

  Although the embodiments of the present invention have been described above, design changes can be made as appropriate without departing from the spirit of the present invention. For example, in the above-described embodiment, the auxiliary member is arranged on one side of the inner corner, but the auxiliary member may be arranged on both sides of the inner corner. In the removing step in this case, auxiliary members on which burrs are formed are removed on both sides of the plasticized region. That is, in the removing step according to the present invention, the auxiliary member may be removed from at least one of the jacket body 2 and the sealing body 3.

  Moreover, in this embodiment, although the protrusion part 12b was provided in the support part 12, the protrusion part 12b may be abbreviate | omitted and the support part 12 and the sealing body 3 may be joined. Further, in the present embodiment, the first friction stirring step and the second friction stirring step are performed discontinuously. However, after the first friction stirring step is finished, the welding rotary tool F is not detached and the second friction stirring step is performed as it is. You may perform a friction stirring process. Thereby, a joining cycle can be raised more.

  Further, in the present embodiment, the liquid cooling jacket 1 is a rectangular parallelepiped in appearance, but may be a columnar body having a cylindrical shape in appearance and other polygonal sections, for example.

DESCRIPTION OF SYMBOLS 1 Liquid cooling jacket 2 Jacket body 3 Sealing body 10 Bottom part 11 Peripheral wall part 12 Support part 13 Concave part 23 Concave groove 30 Auxiliary member F Rotary tool for rotation (rotary tool)
F1 connecting portion F2 stirring pin Fc rotation center axis J1 butt portion V burr W1 plasticizing region W2 plasticizing region

Claims (5)

A method for manufacturing a liquid cooling jacket comprising a jacket body having a recess through which a heat transport fluid flows, and a sealing body for sealing an opening of the recess,
While preparing the sealing body, having a bottom and a frame-shaped peripheral wall that rises from the peripheral edge of the bottom, a step bottom formed at a position one step lower than the end surface of the peripheral wall, and the step bottom A preparation step of preparing the jacket main body with a stepped side surface that rises;
A butting step in which the sealing body having a thickness larger than the height dimension of the step side surface is placed on the step bottom surface to form a butt portion in which the step side surface and the side surface of the sealing body are abutted against each other. When,
An arranging step of arranging an auxiliary member at an inner corner constituted by an end surface of the peripheral wall portion and a side surface of the sealing body;
A friction stirring step of inserting a rotary tool having a stirring pin in the inner corner and performing friction stirring on the butt portion in a state where only the stirring pin is in contact with the jacket body, the sealing body and the auxiliary member; ,
Removing the auxiliary member formed with burrs from at least one of the jacket body and the sealing body,
In the friction stirring step, the rotating tool is rotated around the sealing body along the inner corner, and the butt portion is joined.   The method for manufacturing a liquid cooling jacket according to claim 1, wherein in the friction stirring step, a joining condition is set so that the burr is generated in the auxiliary member.   3. The method for manufacturing a liquid cooling jacket according to claim 1, wherein in the friction stirring step, friction stirring is performed in a state where a rotation center axis of the rotary tool is inclined outward. In the preparation step, a support portion provided with an end surface flush with the step bottom surface and a protruding portion protruding from the support portion are formed on the bottom portion, and a concave groove is formed on the back surface of the sealing body,
In the butting step, the sealing body is placed while inserting the protruding portion into the concave groove,
In the friction agitation step, only the agitation pin of the rotary tool is applied to the fitting part in which the protruding part and the concave groove are fitted together, only the sealing body, or the protruding part and the sealing body. The method for producing a liquid-cooled jacket according to any one of claims 1 to 3, wherein friction stirring is performed in a contacted state. The support portion extends from the peripheral wall portion,
5. The liquid according to claim 4, wherein, in the friction agitation step, after the frictional agitation of the fitting portion is performed, the fitting is moved as it is to the peripheral wall portion, and the rotary tool is detached on the peripheral wall portion. Manufacturing method for cold jacket.

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