JP5136072B2 - Manufacturing method of liquid cooling jacket - Google Patents

Description

The present invention also relates to the production how of the 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 metal members are fixed to each other by causing the metal at the abutting portion to flow plastically by frictional heat between the rotating tool and the metal member by moving the rotating tool along the abutting portion while rotating the rotating tool. Phase joining is performed.

  By the way, in recent years, as the performance of an electronic device typified by a personal computer is improved, the amount of heat generated by a CPU (heat generating body) to be mounted has increased, and cooling of the CPU has become increasingly 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.

In such a liquid cooling jacket, Patent Document 1 discloses a technique in which constituent members are joined by friction stir welding. This liquid cooling jacket includes, for example, a jacket body having a fin housing chamber for housing metal fins, and a sealing body for sealing the fin housing chamber, and seals the peripheral wall of the jacket body surrounding the fin housing chamber. The liquid cooling jacket is manufactured by rotating the rotating tool around the abutting portion with the stationary body and performing friction stir welding. And in patent document 1, by making the start end and termination | terminus in friction stir welding overlap, a jacket main body and a sealing body are joined favorably, and the heat transport fluid which flows through a fin accommodation chamber becomes difficult to leak outside. Techniques for doing so are disclosed.
JP 2006-324647 A (FIGS. 18 to 20)

  However, generally, in the friction stir welding method, a cavity defect may occur in the plasticized region. In the liquid cooling jacket manufactured by the manufacturing method of the liquid cooling jacket described in Patent Document 1 (friction stir welding method), even if a cavity defect occurs, it is difficult to be exposed on the surface. However, it is required to improve the sealing performance by reducing the cavity defects near the abutting portion in order to further improve the reliability.

The present invention aims to provide a manufacturing how the liquid cooling jacket can improve sealing performance of the joint.

As a means for solving the above-mentioned problems, the present invention provides a jacket main body having a recessed portion in which a heat transport fluid for transporting heat generated by a heat generating body flows to the outside and a partially opened recess, and the opening of the recessed portion is provided. In the manufacturing method of the liquid cooling jacket constituted by fixing the sealing body to be sealed by friction stir welding, along the abutting portion between the opening peripheral edge of the recess of the jacket body and the peripheral edge of the sealing body After forming a plasticizing region by making one rotation of the rotating tool, the amount of pushing into the abutting portion of the rotating tool is made larger than the amount of pushing into the abutting portion in the first round of the rotating tool, and the plasticizing It is a manufacturing method of a liquid cooling jacket characterized in that the rotary tool is further rotated along a region to fix the sealing body to the jacket body.

According to such a method, since the plasticizing region is further stirred by forming the plasticizing region by rotating the rotating tool once and further rotating the rotating tool along the plasticizing region. The sealing performance of the joint can be improved, and a highly reliable liquid cooling jacket can be supplied. Further, since the rotary tool is pushed further into the second round and efficiently stirred, cavity defects can be reduced and the sealing performance of the joint can be improved.

  The invention according to claim 2 is characterized in that the start end and the end of the first round of the rotary tool overlap, and a part of the plasticizing region overlaps. It is a manufacturing method of a cold jacket.

  According to such a method, the peripheral wall of the jacket main body and the sealing body can be satisfactorily joined by overlapping a part of the plasticized region. Thereby, it becomes difficult for the heat transport fluid to leak to the outside, and the sealing performance of the joint portion can be improved.

  The invention according to claim 3 is characterized in that the movement trajectory of the second rotation of the rotary tool is shifted outward from the plasticizing region formed by the movement of the first rotation of the rotary tool. Or it is a manufacturing method of the liquid cooling jacket of Claim 2.

  According to such a method, even if a cavity defect occurs in the first round, it is possible to reduce the cavity defect by stirring in the movement of the second round, and in the unlikely event that a cavity defect occurs in the second round However, the heat transport fluid is less likely to leak to the outside, and the sealing performance of the joint can be greatly improved since it occurs at a portion separated from the abutting portion between the opening peripheral portion of the jacket body and the peripheral portion of the sealing body. it can.

In the invention according to claim 4, the insertion position of the rotary tool is an upper surface of the peripheral wall that is outside the abutting portion, and the drawing position of the rotary tool is an upper surface of the peripheral wall that is outside the abutting portion. It is a manufacturing method of the liquid cooling jacket of any one of the Claims 1 thru | or 3 characterized by the above-mentioned.

  In the invention according to claim 5, when the rotating tool is moved clockwise with respect to the opening, the rotating tool is rotated clockwise, and the rotating tool is moved counterclockwise with respect to the opening. The method for manufacturing a liquid cooling jacket according to any one of claims 1 to 4, wherein the rotary tool is rotated counterclockwise.

  According to such a method, even if a cavity defect occurs, it will occur in a part away from the abutting part, and the heat transport fluid will be difficult to leak to the outside. Performance can be improved.

  The invention according to claim 6 is characterized in that the moving direction in the second turn of the rotating tool is opposite to the moving direction in the first turn of the rotating tool. 2. A method for producing a liquid cooling jacket according to item 1.

  According to such a method, the abutting portion is agitated in the opposite direction in the first and second revolutions, and thus is agitated efficiently. Therefore, cavity defects can be reduced and the sealing performance of the joint can be improved.

  According to a seventh aspect of the present invention, prior to the step of forming the plasticized region with the rotary tool, a part of the abutting portion is temporarily joined using a temporary joining rotary tool smaller than the rotary tool. The method for manufacturing a liquid cooling jacket according to any one of claims 1 to 6, wherein:

  According to such a method, by temporarily joining the jacket body and the sealing body, the sealing body does not move during the main joining, and it becomes easy to perform the main joining and positioning of the sealing body. Accuracy is improved. In addition, since the temporary welding rotary tool is smaller than the main welding rotary tool, the main welding can be completed only by moving the main welding rotary tool on the temporary bonding portion and performing frictional stirring.

  The invention according to claim 8 is characterized in that the abutting portion has a rectangular ring shape, and in the step of temporarily joining the abutting portion with the temporary joining rotary tool, one diagonal of the abutting portion is temporarily joined first. The method of manufacturing a liquid cooling jacket according to claim 7, wherein the other diagonals are temporarily joined together.

  According to such a method, the sealing body can be temporarily joined with a good balance, and the positioning accuracy of the sealing body with respect to the jacket body is improved.

  In the invention according to claim 9, the abutting portion has a rectangular ring shape, and in the step of temporarily joining the abutting portion with the temporary joining rotary tool, an intermediate portion of one opposite side of the abutting portion is first placed. 8. The method for manufacturing a liquid-cooled jacket according to claim 7, wherein the intermediate portions of the other opposite side are temporarily joined after the temporary joining.

  According to such a method, the sealing body can be temporarily joined with a good balance, and the positioning accuracy of the sealing body with respect to the jacket body is improved. Furthermore, since temporary joining is performed linearly, processing becomes easy.

  According to the present invention, the sealing performance of the joint portion between the jacket body of the liquid cooling jacket and the sealing body or the joint portion between the opening of the first member and the plate-like second member can be improved. Exhibits excellent effects.

  Hereinafter, embodiments of the present invention will be described in detail with appropriate reference to the drawings.

(First embodiment)
First, the liquid cooling jacket formed by the liquid cooling jacket manufacturing method and the friction stir welding method according to the present invention will be described. The liquid cooling jacket is a component of a cooling system mounted on an electronic device such as a personal computer, for example, and is a component that cools a CPU (heat generating body) and the like. The liquid cooling system includes a liquid cooling jacket in which a CPU is mounted at a predetermined position, a radiator (heat dissipating means) that discharges heat transported by cooling water (heat transport fluid) to the outside, and a micropump (heat transport) that circulates the cooling water. Fluid supply means), a reserve tank that absorbs expansion / contraction of cooling water due to temperature change, a flexible tube that connects these, and cooling water that transports heat. For example, an ethylene glycol antifreeze is used as the cooling water. And if a micropump act | operates, cooling water will circulate through these apparatuses.

  As shown in FIG. 1, the liquid cooling jacket 1 partially flows with cooling water (not shown), which is a heat transport fluid that transports heat generated by a CPU (not shown), which is a heat generator, to the outside. A sealing body 30 that seals the opening 12 of the recess 11 is fixed to the jacket main body 10 having the recess 11 opened by friction stir welding (see FIG. 3).

  The liquid cooling jacket 1 is configured such that a CPU (not shown) is attached to the lower center of the liquid cooling jacket 1 via a heat diffusion sheet (not shown). As the cooling water flows through 1, the heat generated by the CPU is received and exchanged with the cooling water flowing through the inside. Thereby, the liquid cooling jacket 1 transmits the heat received from the CPU to the cooling water, and as a result, the CPU is efficiently cooled. The thermal diffusion sheet is a sheet for efficiently transmitting the heat of the CPU to the jacket body 10 and is formed of a metal having high thermal conductivity such as copper, for example.

  The jacket main body 10 is a shallow box that is open on one side (the upper side in the present embodiment), and has a recess 11 formed therein, and has a bottom wall 13 and a peripheral wall 14. . Such a jacket main body 10 is produced by die casting, casting, forging or the like, for example. The jacket body 10 is formed from aluminum or an aluminum alloy. Thereby, the liquid cooling jacket 1 has been reduced in weight and is easy to handle.

  A stepped portion 15 that is lowered by one step is formed on the bottom surface side of the recessed portion 11 at the opening peripheral edge portion 12 a of the recessed portion 11 of the jacket body 10. The step portion 15 has a step having the same dimension as the thickness of the sealing body 30. On the stepped portion 15 lowered by one step, the peripheral portion 30a of the sealing body 30 is placed. The width W1 of the step portion 15 is preferably set as small as possible in order to secure the volume of the recess 11 through which the cooling water flows. Through-holes 16 and 16 for circulating cooling water through the recess 11 are formed in a pair of wall portions 14a and 14a facing each other of the peripheral wall 14, respectively. In this embodiment, the through-holes 16 and 16 extend in the opposing direction of the walls 14 a and 14 a (X-axis direction in FIG. 1), have a circular cross section, and are formed in the intermediate portion in the depth direction of the recess 11. Is formed. In addition, the shape and position of the through-hole 16 are not restricted to this, It can change suitably according to the kind and flow volume of cooling water.

  As shown in FIGS. 1 and 2, the sealing body 30 is a plate-like lid having a planar shape that is the same shape (square in this embodiment) as the opening 12 (see FIG. 1) of the recess 11 of the jacket body 10. It comprises a plate portion 31 and a plurality of fins 32, 32... Provided on the lower surface of the lid plate portion 31.

  The plurality of fins 32, 32... Are arranged parallel to each other and orthogonal to the lid plate portion 31, and are configured integrally with the lid plate portion 31. Thereby, heat is transmitted favorably between the cover plate portion 31 and the fins 32, 32. As shown in FIG. 1, the fins 32, 32... Are arranged so as to extend in a direction (X-axis direction in FIG. 1) orthogonal to the wall portions 14a, 14a of the peripheral wall 14 in which the through holes 16, 16 are formed. ing. The fin 32 has a height (depth) dimension (length in the Z-axis direction in FIG. 1) equivalent to the depth dimension of the recess 11, and its tip end abuts against the bottom surface of the recess 11. It has become. Thus, in a state where the sealing body 30 is attached to the jacket body 10, a cylindrical space is partitioned by the cover plate portion 31 of the sealing body 30, the adjacent fins 32 and 32, and the bottom surface of the recess 11. The space functions as a flow path 33 (see FIG. 3A) through which cooling water flows. Further, the fins 32, 32... Have a length dimension (length in the X-axis direction in FIG. 1) shorter than the length dimension of one side of the recess 11, and both ends of the fins 32, 32. Each of the wall portions 14a, 14a is configured to be spaced from the inner wall surface by a predetermined distance. Thus, in a state in which the sealing body 30 is attached to the jacket main body 10, the space between the outer ends of the fins 32, 32... And the wall portion 14 a of the peripheral wall 14 of the concave portion 11 extends from the through hole 16 to the fin. The flow path header portion 34 (see FIG. 3A) extending in the direction orthogonal to the extending direction of 32 (the Y-axis direction in FIG. 1) is configured.

  The sealing body 30 is also made of aluminum or an aluminum alloy, like the jacket body 10. Thereby, the liquid cooling jacket 1 has been reduced in weight and is easy to handle. The sealing body 30 is formed from aluminum or an aluminum alloy, and is formed by cutting a block. In addition, the manufacturing method is not limited to this. For example, a member having a cross-sectional shape including the cover plate portion 31 and the plurality of fins 32, 32... Is formed by extrusion molding or groove processing. You may comprise by removing both ends.

  Next, a method of fixing the sealing body 30 to the jacket body 10 by friction stir welding will be described with reference to FIGS. 3 and 4.

  First, as shown in FIG. 3A, the sealing body 30 is inserted into the concave portion 11 of the jacket body 10 with the fins 32 on the lower side, and the peripheral portion 30a of the sealing body 30 is It is installed so as to be placed on the step portion 15 of the opening peripheral edge portion 12a of the recess 11. Here, the opening peripheral part 12a of the recessed part 11 of the jacket main body 10 and the peripheral part 30a of the sealing body 30 are faced | matched, and the abutting part 40 is comprised.

  Next, the rotary tool 50 for friction stir welding is relatively moved along the abutting portion 40. At this time, it is preferable that a jig (not shown) surrounding the jacket body 10 from four directions is applied in advance to the peripheral surface of the peripheral wall 14 of the jacket body 10. According to this, the thickness of the peripheral wall 14 is thin, and the distance (gap) between the outer peripheral surface of the shoulder 51 (see FIG. 4A) of the rotary tool 50 and the outer peripheral surface of the peripheral wall 14 is, for example, 2 Even if it is 0.0 mm or less, the peripheral wall 14 is hardly deformed to the outside by the pressing force of the rotary tool 50. In addition, when the thickness of the surrounding wall 14 is thick, the said jig | tool does not need to be installed.

  The rotary tool 50 is made of a metal material that is harder than the jacket body 10 and the sealing body 30, and has a cylindrical shoulder portion 51 and a lower end surface of the shoulder portion 51 as shown in FIG. A projecting stirring pin (probe) 52 is provided. The dimensions and shape of the rotary tool 50 may be set according to the material and thickness of the jacket body 10 and the sealing body 30. The protruding length dimension L1 of the stirring pin 52 is preferably 60% or less of the thickness dimension T1 of the cover plate portion 31 of the sealing body 30 (in this embodiment, approximately 50%). According to such a configuration, the sealing body 30 is less likely to be deformed toward the concave portion 11 by friction stir welding, and the volume of the concave portion 11 is prevented from being reduced. The rotational speed of the rotary tool 50 is 500 to 15000 (rpm), the feed speed is 0.05 to 2 (m / min), and the pushing force for pressing the abutting portion 40 is about 1 to 20 (kN). 10 and the sealing body 30 are appropriately selected according to the material, plate thickness, and shape.

  As shown in FIG. 3A, the insertion position 53 of the rotary tool 50 is the upper surface of the peripheral wall 14 that is outside the abutting portion 40. The rotation tool 50 is moved while rotating from the insertion position 53 to the abutting portion 40. When the axis of the rotary tool 50 moves to a portion located on the abutting surface 40a of the abutting portion 40, the rotating tool 50 is moved so that the axis is along the abutting surface 40a. At this time, the rotation direction (rotation direction) of the rotary tool 50 is set to be the same direction as the movement direction (revolution direction). That is, in the present embodiment, the rotary tool 50 is moved clockwise with respect to the opening 12 of the concave portion 11 (see arrow Y1 in FIG. 3), so that the rotary tool 50 is rotated clockwise (in FIG. 3, (See arrow Y2). When the rotary tool 50 is moved counterclockwise with respect to the opening 12 of the recess 11, the rotary tool 50 is rotated counterclockwise.

  Thereafter, the rotation and movement of the rotary tool 50 are continued, and the plasticizing region 41 is formed by making the rotary tool 50 go around the opening 12 as shown in FIG. Here, the “plasticization region” includes both a state in which the rotary tool 50 is heated by frictional heat and is actually plasticized, and a state in which the rotary tool 50 passes and returns to room temperature. At this time, the start end 54a (see FIG. 3A) and the end 54b (see FIG. 3B) in the first round of the rotating tool 50 overlap, and a part of the plasticizing region 41 overlaps. Is configured to do.

  Then, as shown in (c) of FIG. 3, after the movement of the first round of the rotary tool 50 is finished, the rotary tool 50 is further rotated once along the plasticizing region 41. In the present embodiment, the rotation and movement of the second turn of the rotary tool 50 are the same as the rotation direction, rotation speed, movement direction, and movement speed of the first turn (see arrows Y3 and Y4 in FIG. 3). Further, when entering the second round of movement, the rotary tool 50 is not replaced, and is continuously rotated and moved while being inserted into the abutting portion 40, and the pushing amount is not changed. Note that the rotation speed, movement speed, and the like of the rotary tool 50 may be appropriately changed according to the shape and material of the jacket body 10 and the sealing body 30.

  Here, the rotation tool 50 forms the plasticized region 41 in the movement of the first round, and further stirs the formed plasticized region 41 in the movement of the second round, thereby reducing the cavity defects existing therein. I am letting. Hereinafter, a region formed after the second movement of the rotary tool 50 is completed may be referred to as a “second plasticizing region 43”.

  Then, as shown in FIG. 3C, when the movement of the second turn of the rotary tool 50 is completed, the upper surface of the peripheral wall 14 that has moved the rotary tool 50 out of the plasticizing region 41 (butting portion 40). The rotary tool 50 is pulled out at that position. As described above, the extraction position 55 of the rotary tool 50 is located outside the abutting portion 40, so that the extraction trace of the stirring pin 52 is not formed in the abutting portion 40. Thereby, the joining property of the jacket main body 10 and the sealing body 30 can further be improved.

  As described above, the rotary tool 50 is rotated around the opening portion 12 of the recess 11 along the abutting portion 40 (see FIG. 3A) to perform friction stir welding, and is sealed to the jacket body 10 By fixing the body 30, the liquid cooling jacket 1 is formed.

  According to the method for manufacturing the liquid cooling jacket 1 and the friction stir welding method according to the present embodiment, after forming the plasticized region 41 by making one rotation of the rotary tool 50, the rotary tool 50 is further moved along the plasticized region 41. By making one round, a second plasticized region 43 that is further stirred than the plasticized region 41 is formed. That is, even when a cavity defect occurs in the plasticized region 41, the defect is automatically repaired, and the cavity defect in the second plasticized region 43 can be greatly reduced. Accordingly, the sealing performance of the joint can be further improved, and the highly reliable liquid cooling jacket 1 can be supplied.

  Further, the movement of the rotating tool 50 in the second round is continuously performed following the movement of the first round without exchanging the rotating tool 50, so that an increase in the joining time can be suppressed.

  Further, the start end 54a and the end end 54b in the first round of the rotary tool 50 overlap each other, and a part of the plasticized region 41 overlaps, so that the peripheral wall 14 of the jacket body 10, the sealing body 30, Can be bonded satisfactorily. That is, since the plasticized region 41 reliably covers the entire circumference of the abutting portion 40, the heat transport fluid is less likely to leak to the outside, and the sealing performance of the joint portion can be further improved.

  In addition, by rotating the rotary tool 50 in the same direction as the movement direction of the recess 11 around the opening 12, even if a cavity defect occurs in the second plasticization region 43, it is closer to the outside than the abutting portion 40. The space 56 (see (b) of FIG. 4) is generated at a portion separated by a predetermined distance from the abutting surface 40a. Therefore, since the heat transport fluid in the recess 11 does not flow through the cavity defect, it becomes difficult to leak to the outside of the recess 11, and the sealing performance of the joint can be further improved.

  Furthermore, the sealing body 30 has the lid plate portion 31 and the fins 32, 32... Integrally formed, so that the rigidity of the lid plate portion 31 is increased, and the sealing body 30 is heated by the friction stir welding. Deformation can be prevented. Thereby, the abutting state of the opening peripheral part 12a of the opening part 12 of the recessed part 11 and the peripheral part 30a of the sealing body 30 becomes favorable, and the sealing performance of a junction part can further be improved.

(Second Embodiment)
Next, a method for manufacturing a liquid cooling jacket and a friction stir welding method according to the second embodiment will be described with reference to FIG.

  In this embodiment, as shown in FIG. 5A, prior to the step of forming the plasticized region 41 with the rotary tool 50 of the first embodiment, the sealing is performed with the opening peripheral portion 12a of the opening 12 of the recess 11 and the sealing. A part of the abutting portion 40 with the peripheral edge portion 30a of the stationary body 30 is temporarily joined using a temporary joining rotary tool 60 smaller than the rotary tool 50. After performing temporary joining, the main joining similar to 1st Embodiment is performed using the rotary tool 50 (refer FIG.5 (b)).

  The temporary joining rotary tool 60 includes a stirring pin (not shown) having a diameter smaller than that of the stirring pin 52 of the rotating tool 50, and the plasticized region 45 to be formed is formed by the rotating tool 50 in a later step. It has a width smaller than the width of the plasticized region 41 (see FIG. 5B). As a result, the plasticizing region 45 in the temporary joining is completely covered with the plasticizing region 41, so that the trace of the extraction of the temporary joining rotary tool 60 remaining in the plasticizing region 45 and the trace of the plasticizing region 45 are present. Does not remain.

  In the present embodiment, as in the first embodiment, the abutting portion 40 has a square shape (rectangular ring), and in the step of temporarily joining the abutting portion 40 with the temporary joining rotary tool 60, one of the abutting portions 40 is provided. After the diagonals 44a and 44b are temporarily joined together, the other diagonals 44c and 44d are temporarily joined. By temporarily joining in such an order, the sealing body 30 can be temporarily joined to the jacket body 10 in a well-balanced manner, and the positioning accuracy of the sealing body 30 with respect to the jacket body 10 is improved. Deformation can be prevented. Moreover, by performing the temporary joining of the sealing body 30, it is possible to prevent the sealing body 30 from being displaced at the time of the main joining by the rotary tool 50, and to further improve the sealing performance of the joint portion.

(Third embodiment)
Next, a method for manufacturing a liquid cooling jacket and a friction stir welding method according to the third embodiment will be described with reference to FIG.

  In this embodiment, as shown in FIG. 6A, prior to the step of forming the plasticized region 41 with the rotary tool 50 of the first embodiment, the sealing is performed with the opening peripheral portion 12a of the opening 12 of the recess 11 and the sealing. A part of the abutting portion 40 with the peripheral edge portion 30a of the stationary body 30 is temporarily joined using a temporary joining rotary tool 60 smaller than the rotary tool 50. Temporary joining here is performed in a straight line by friction stir welding at the middle part of each side, while the second embodiment is friction stir welding the corners of the butt 40 of the square. ing. Specifically, the abutting portion 40 has a square shape (rectangular ring shape), and in the step of temporarily joining the abutting portion 40 with the temporary joining rotary tool 60, an intermediate portion 46 a of one opposite side 46, 46 of the abutting portion 40. , 46b are temporarily joined together, and then the intermediate portions 47a, 47b of the other opposite sides 47, 47 are temporarily joined. At this time, the plasticizing regions 48 formed by the temporary bonding rotary tool 60 are linearly formed with the same length.

  In this embodiment, by temporarily joining in the order as described above, the sealing body 30 can be temporarily joined to the jacket body 10 in a balanced manner, and the positioning accuracy of the sealing body 30 with respect to the jacket body 10 is improved. The deformation of the sealing body 30 can be prevented. Further, by performing temporary bonding of the sealing body 30, it is possible to prevent the sealing body 30 from being displaced during the main bonding by the rotary tool 50. Furthermore, according to this embodiment, since the friction stir welding of the temporary bonding is linear, it is only necessary to move the temporary bonding rotary tool 60 linearly and the processing is easy.

(Fourth embodiment)
Next, a method for manufacturing a liquid cooling jacket and a friction stir welding method according to the fourth embodiment will be described with reference to FIGS. 7, 8, and 9.

  In this embodiment, as shown in FIG. 7, the movement trajectory in the second turn of the rotary tool 50 is shifted outward from the plasticizing region 41 formed by the movement in the first turn of the rotary tool 50. And

  Specifically, first, as shown in FIG. 7A, the sealing body 30 is inserted into a recess (not shown) of the jacket body 10, and the peripheral portion 30 a of the sealing body 30 is recessed. Then, the rotary tool 50 is inserted into the insertion position 53 on the upper surface of the peripheral wall 14 that is outside the abutting portion 40. Thereafter, the rotary tool 50 is moved to the start end 54 a of the abutting portion 40, and is moved to the first end 54 b along the abutting portion 40 to form the plasticized region 41. The steps up to here are the same as those in the first embodiment (the same as in FIG. 3B). The rotation of the rotary tool 50 in the first round is clockwise with respect to the opening (not shown) of the recess (not shown) (see arrow Y1 in FIG. 7). The rotation is clockwise (see arrow Y2 in FIG. 7).

  Thereafter, as shown in FIG. 8, the rotary tool 50 is shifted outward from the end 54b of the first round. At this time, the first end 54a and the last end 54b of the first turn of the rotary tool 50 overlap each other. The deviation of the rotation tool 50 moves obliquely so as to move outward in the direction of movement, and the inner end of the second movement trajectory of the rotation tool 50 is the first movement trajectory (plasticization). It is located outside the center line of the region 41) (the abutting surface 40a of the abutting portion 40). Thereafter, as shown in FIG. 7B, the rotary tool 50 moves in parallel while maintaining the positional relationship with the movement trajectory (plasticization region 41) in the first round. As a result, the outer part of the movement track of the first round is agitated by the movement of the second round of the rotary tool 50 (see FIGS. 8 and 9). The movement of the rotary tool 50 in the second round is the same as the rotation direction, rotation speed, movement direction, movement speed, and push-in amount in the first round. Note that the rotation speed, movement speed, push-in amount, and the like of the second rotation tool 50 may be changed as appropriate according to the shape and material of the jacket body 10 and the sealing body 30.

Then, as shown in FIG. 7C, when the movement of the second turn of the rotary tool 50 is completed, the extraction position of the upper surface of the peripheral wall 14 that is outside the second plasticizing region 43 is removed. 55
The rotary tool 50 is pulled out at that position.

  According to the present embodiment, the following operational effects can be obtained in addition to the operational effects obtained in the first embodiment.

  In the present embodiment, the movement trajectory in the second round of the rotary tool 50 is shifted outward from the plasticizing region 41 formed by the movement in the first round of the rotary tool 50, so that the cavity is created by friction stirring in the first round. Even if a defect occurs, the cavity defect occurs in the outer space 56a (see FIG. 9) in the plasticized region 41. Therefore, stirring is performed by the second movement of the rotary tool 50 to reduce the cavity defect. be able to. Furthermore, even if a cavity defect occurs due to the friction agitation in the second round, it will occur in the space 56b (see FIG. 9) near the outside of the movement locus shifted to the outside. The main body 10 is greatly separated from the abutting portion 40 between the opening peripheral portion 12a of the main body 10 and the peripheral portion 30a of the sealing body 30. Therefore, it becomes difficult for the heat transport fluid to leak to the outside, and the sealing performance of the joint portion can be further improved.

(Fifth embodiment)
Next, a method for manufacturing a liquid cooling jacket and a friction stir welding method according to a fourth embodiment will be described with reference to FIG.

  As shown in FIG. 10, this embodiment is characterized in that the moving direction in the second turn of the rotary tool 50 is opposite to the moving direction in the first turn of the rotating tool.

  Specifically, first, as shown in FIG. 10A, the sealing body 30 is inserted into a recess (not shown) of the jacket body 10, and the peripheral portion 30 a of the sealing body 30 is recessed. Then, the rotary tool 50 is inserted into the insertion position 53 on the upper surface of the peripheral wall 14 that is outside the abutting portion 40. Thereafter, the rotary tool 50 is moved to the start end 54 a of the abutting portion 40, and is moved to the first end 54 b along the abutting portion 40 to form the plasticized region 41. The steps so far are the same as in the first embodiment (up to (b) in FIG. 3). The first rotation of the rotary tool 50 is clockwise with respect to the opening 12 of the recess (see arrow Y1 in FIG. 10), and the rotation direction of the rotary tool 50 is also clockwise (FIG. 10). Middle, see arrow Y2).

  Thereafter, as shown in FIG. 10B, the rotary tool 50 is folded back at the end 54b of the first round and moved counterclockwise along the formed plasticized region 41 (along the abutting portion 40). (See arrow Y5 in FIG. 10). At this time, the rotation tool 50 continues to rotate clockwise as in the first rotation (see arrow Y6 in FIG. 10). The second plasticizing region 43 in which the formed plasticizing region 41 is further stirred is formed by the second rotation in which the rotating tool 50 moves in the opposite direction to the first rotation and rotates in the same direction. Note that the rotation speed, movement speed, push-in amount, and the like of the second rotation tool 50 may be changed as appropriate according to the shape and material of the jacket body 10 and the sealing body 30.

  Then, as shown in FIG. 10C, when the movement of the second turn of the rotary tool 50 is completed (in this embodiment, the rotary tool 50 is moved to the start end 54a of the first turn), the rotary tool 50 is second plasticized. It moves to the upper surface of the surrounding wall 14 which remove | deviated from the area | region 43 (butting part 40), and the rotary tool 50 is pulled out in the position. The position where the rotary tool 50 is pulled out is the same as the insertion position 53.

  According to the present embodiment, the following operational effects can be obtained in addition to the operational effects obtained in the first embodiment.

  In the present embodiment, the plasticizing regions 41 and 43 are agitated in the opposite directions in the first and second rounds by reversing the moving directions in the first and second rounds of the rotary tool 50. So it is stirred efficiently. Therefore, cavity defects can be reduced and the sealing performance of the joint can be improved.

(Sixth embodiment)
Next, a method for manufacturing a liquid cooling jacket and a friction stir welding method according to a sixth embodiment will be described with reference to FIG.

  As shown in FIG. 11, this embodiment is characterized in that the pushing amount into the abutting portion 40 in the second round of the rotary tool 50 is larger than the pushing amount into the abutting portion 40 in the first round of the rotating tool 50. And

  Specifically, as shown in FIG. 11A, the rotary tool 50 in the first round is slightly lower in the lower end surface of the shoulder portion 51 of the rotary tool 50 than the upper end surfaces of the jacket body 10 and the sealing body 30. The distance between the upper end surfaces of the jacket main body 10 and the sealing body 30 and the lower end surface of the shoulder portion 51 of the rotary tool 50 is the amount L2 pushed into the abutting portion 40. . As for the rotary tool 50 in the second round, as shown in FIG. 11B, the lower end surface of the shoulder portion 51 of the rotary tool 50 is deeper than the first round and lower than the upper end surfaces of the jacket body 10 and the sealing body 30. It arrange | positions so that it may be located in height, and the pushing amount L3 to the abutting part 40 of the rotary tool 50 is larger than the pushing amount L2 to the abutting part 40 in the 1st round of the rotating tool 50. At this time, the second plasticizing region 43 formed by the rotary tool 50 is formed up to a deep position of the abutting portion 40. In addition, the metal pushed away by the shoulder part 51 of the rotary tool 50 is removed as a burr.

  According to the present embodiment, the following operational effects can be obtained in addition to the operational effects obtained in the first embodiment.

  In the present embodiment, the amount of pushing into the abutting portion 40 in the second round of the rotary tool 50 is made larger than the amount of pushing into the abutting portion 40 in the first round of the rotating tool 50. The pressure applied to the second plasticizing region 43 is increased by the pressing force of the rotary tool 50 and is efficiently stirred. Thereby, cavity defects can be reduced.

  As mentioned above, although embodiment of this invention was described, embodiment of this invention is not limited to this, In the range which does not deviate from the meaning of this invention, it can change suitably, For example, in the said embodiment, Although the sealing body 30 is a square in plan view, the shape is not limited to this, and may be other shapes such as a rectangle, a polygon, and a circle. Furthermore, in the said embodiment, the fin 32 provided in the sealing body 30 may be a different body from a cover board part, for example, may be integral with a jacket main body.

  Moreover, in the said embodiment, although the friction stir welding method of the jacket main body 10 and the sealing body 30 was demonstrated as a manufacturing method of a liquid cooling jacket, as embodiment of a friction stir welding method, it is not restricted to this. Of course, the present invention can be applied to joining metal materials of other forms (a first member corresponding to the jacket body 10 and a plate-like second member corresponding to the sealing body 30).

It is a disassembled perspective view of the liquid cooling jacket which concerns on 1st Embodiment. It is a perspective view of the sealing body of the liquid cooling jacket which concerns on 1st Embodiment. (A)-(c) is process drawing of the manufacturing method of the liquid cooling jacket which concerns on 1st Embodiment. (A) is sectional drawing which showed the friction stir welding of the manufacturing method of the liquid cooling jacket which concerns on 1st Embodiment, (b) is the cross section which showed the plasticization area | region formed by the friction stir welding of (a). FIG. (A), (b) is process drawing of the manufacturing method of the liquid cooling jacket which concerns on 2nd Embodiment. (A), (b) is process drawing of the manufacturing method of the liquid cooling jacket which concerns on 3rd Embodiment. (A)-(c) is process drawing of the manufacturing method of the liquid cooling jacket which concerns on 4th Embodiment. It is the enlarged plan view which showed the friction stir welding of the manufacturing method of the liquid cooling jacket which concerns on 4th Embodiment. It is sectional drawing which showed the plasticization area | region formed by the friction stir welding of the manufacturing method of the liquid cooling jacket which concerns on 4th Embodiment. (A)-(c) is process drawing of the manufacturing method of the liquid cooling jacket which concerns on 5th Embodiment. (A) is sectional drawing which showed the 1st round of the friction stir welding of the manufacturing method of the liquid cooling jacket which concerns on 6th Embodiment, (b) is the friction stirring of the manufacturing method of the liquid cooling jacket which concerns on 6th Embodiment. It is sectional drawing which showed the 2nd round of joining.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid cooling jacket 10 Jacket main body 11 Recessed part 12 Opening part 12a Opening peripheral part 30 Sealing body 30a Peripheral part 40 Butting part 41 Plasticization area | region 50 Rotating tool 60 Rotating tool for temporary joining

Claims (9)

A sealing body that seals the opening of the recess is fixed to the jacket body having a recess that is partially opened while a heat transport fluid that transports heat generated by the heat generator flows to the outside by friction stir welding. In the manufacturing method of the liquid cooling jacket constituted,
The amount of pushing of the rotary tool into the butt portion after forming a plasticized region by making a round of the rotary tool along the butt portion between the peripheral edge of the opening of the concave portion of the jacket body and the peripheral edge of the sealing body Is larger than the amount of pressing into the abutting portion in the first round of the rotary tool, and the rotary tool is further rotated along the plasticizing region to fix the sealing body to the jacket body. A method for producing a liquid-cooled jacket. The manufacturing method of the liquid cooling jacket according to claim 1, wherein a starting end and a terminal end of the first round of the rotating tool overlap and a part of the plasticizing region overlaps. 3. The liquid according to claim 1, wherein a movement trajectory in the second round of the rotary tool is shifted outward from a plasticizing region formed by movement in the first round of the rotary tool. Manufacturing method for cold jacket. The insertion position of the rotary tool is the upper surface of the peripheral wall that is out of the abutting portion, and the extraction position of the rotary tool is the upper surface of the peripheral wall that is out of the abutting portion.
The manufacturing method of the liquid cooling jacket of any one of Claim 1 thru | or 3 characterized by the above-mentioned. When moving the rotary tool clockwise with respect to the opening, rotate the rotary tool clockwise,
The liquid cooling jacket according to any one of claims 1 to 4, wherein when the rotating tool is moved counterclockwise with respect to the opening, the rotating tool is rotated counterclockwise. Method. The liquid cooling jacket according to any one of claims 1 to 4, wherein a moving direction of the rotating tool in the second turn is opposite to a moving direction of the rotating tool in the first turn. Manufacturing method. Prior to the step of forming the plasticized region with the rotary tool, a part of the abutting portion is temporarily joined using a rotary tool for temporary joining that is smaller than the rotary tool. The manufacturing method of the liquid cooling jacket of any one of Claim 6. The abutting portion has a rectangular ring shape;
In the step of temporarily joining the abutting portion with the temporary tool for temporary joining, after temporarily joining one diagonal of the abutting portion first, the other diagonal is temporarily joined. 8. A method for producing a liquid cooling jacket according to 7. The abutting portion has a rectangular ring shape;
In the step of temporarily joining the abutting portion with the temporary tool for temporary joining, the intermediate portions of one opposite side of the abutting portion are temporarily joined first, and then the intermediate portions of the other opposite side are temporarily joined. The manufacturing method of the liquid cooling jacket of Claim 7.

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