JP5062155B2 - Liquid cooling jacket manufacturing method and friction stir welding method - Google Patents

Description

  The present invention relates to a manufacturing method and a friction stir welding method of a liquid cooling jacket configured by fixing a sealing body to an opening of a concave portion of a jacket body by friction stir welding.

  Friction stir welding (FSW = Friction Stir Welding) is known as a method for joining metal members. Friction stir welding is a technique in which metal members are fixed to each other by causing the metal at the abutting portion to plastically flow 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. A liquid cooling jacket is manufactured by rotating the rotating tool around the abutting portion with the outer peripheral surface of the stationary body and performing friction stir welding. The sealing body is formed thinner than the jacket main body, and is placed on a support surface including a bottom surface of a step formed in the jacket main body. The rotating tool moves along the abutting portion so that the center thereof is located on the abutting portion, and joins the jacket body and the sealing body.

By the way, as described above, when a thin sealing body is placed on the support surface of the jacket body and the abutting portion is friction stir welded, the shear side of the rotating tool (relative to the outer periphery of the rotating tool with respect to the bonded portion) The moving direction and rotating direction of the rotating tool are determined so that the speed becomes the value obtained by adding the moving speed to the tangential speed at the outer periphery of the rotating tool). Has been disclosed (see Patent Document 2). By doing in this way, the shear side where there is a large amount of metal flow and there is a possibility of occurrence of a cavity defect becomes the jacket body side which is thick and away from the abutting portion, and the fixing strength can be increased.
JP 2006-324647 A (FIG. 19) JP 2000-246467 A

  However, as in Patent Document 1, when the rotation tool is moved so that the center of the rotating tool is positioned on the abutting portion, the plasticizing region is centered on the abutting portion between the step side surface of the jacket body and the outer peripheral surface of the sealing body. It is formed. Therefore, there were few plasticization regions in the joint surface between the support surface and the lower surface of the sealing body. That is, there is still room for increasing the proportion of the plasticized region on the joint surface between the support surface and the lower surface of the sealing body.

  The liquid cooling jacket manufactured by the liquid cooling jacket manufacturing method (friction stir welding method) described in Patent Document 1 has no problem in the sealing performance of the joint, but in recent years, the reliability has been further improved. Therefore, it is required to improve the sealing performance of the joint portion between the jacket body and the sealing body by increasing the ratio of the plasticized region in the joint surface between the jacket body and the sealing body.

  Then, this invention makes it a subject to provide the manufacturing method and friction stir welding method of a liquid cooling jacket which can improve the sealing performance of the junction part of a jacket main body and a sealing body.

  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 configured by fixing the sealing body to be sealed by friction stir welding, the opening peripheral edge of the recess of the jacket body is lowered by the same dimension as the thickness dimension of the sealing body. Forming a support surface consisting of a bottom surface of the step, placing the sealing body on the support surface, butting the step side surface of the jacket body and the outer peripheral surface of the sealing body, and the step side surface of the jacket body and the step At the position closer to the inner side than the abutting portion with the outer peripheral surface of the sealing body, the front end of the pin of the rotating tool penetrates the support surface, and the abutting portion is positioned on the flow side of the rotating tool. Rotating the rotary tool, along the butting portion while moving is round and forms a plasticized region, a liquid cooling jacket method for producing characterized in that for fixing the sealing body to the jacket body.

  Here, the flow side of the rotating tool refers to a side on which the relative speed of the rotating tool with respect to the bonded portion is reduced by rotating the rotating tool in a direction opposite to the moving direction of the rotating tool. Specifically, the flow side is the left side of the moving direction when the rotating tool rotates left, and the right side of the moving direction when the rotating tool rotates right.

  According to the method as described above, the friction stir welding is performed so that the pin tip penetrates the support surface at a position closer to the inside than the abutting portion between the step side surface of the jacket body and the outer peripheral surface of the sealing body. By performing the above, many plasticized regions can be formed on the joint surface between the support surface and the lower surface of the sealing body, and the joint area can be increased. Also, by rotating and moving the rotating tool so that the abutting part is located on the flow side, the relative speed of the rotating tool with respect to the abutting part is reduced, and the amount of metal flow is reduced. Become. As a result, it is possible to prevent the occurrence of a cavity defect due to the lack of metal in the butt portion, and it is possible to prevent a decrease in the bonding strength of the butt portion. Therefore, the sealing performance of the joint portion between the jacket body and the sealing body can be improved.

  And this invention is characterized by the width dimension of the said support surface being larger than the shoulder diameter dimension of the said rotary tool.

  According to such a method, more plasticized regions can be formed on the joint surface between the support surface and the sealing body, and the joint area can be increased.

  Further, the present invention is characterized in that the rotating tool moves along the abutting portion so that a shoulder portion covers the abutting portion.

  According to such a method, the plasticized region can be reliably formed in the entire butt portion, and the bonding strength at the butt portion can be increased.

  Furthermore, the present invention is characterized in that after the rotating tool makes one turn along the abutting portion, the rotating tool is moved along the starting end portion of the first turn to overlap a part of the plasticizing region. And

  According to such a method, a jacket main body and a sealing body can be favorably 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.

  In addition, the present invention provides the plasticization in which the rotation tool is reversed along the starting end of the first turn, the moving direction of the rotation tool is reversed, and the pins of the rotation tool are formed in the first turn. It shifts to the outer peripheral side of an area | region, The said rotation tool is made to make one round again along the said abutting part, The said plasticization area | region is re-stirred.

  According to such a method, after forming the plasticized region by rotating the rotating tool once, the plasticizing region is further agitated by rotating the rotating tool again, so that the defect repair is automatically performed. And the sealing performance of the joint can be improved. Furthermore, by reversing the direction of movement of the rotating tool and shifting it outward, the shearing side of the rotating tool (the rotating tool rotates in the same direction as the moving direction of the rotating tool, Since the side where the relative speed is high) is located outside the abutting portion, it is possible to prevent a cavity defect from occurring in the abutting portion. Moreover, since the shear side is located in the thick part of the jacket main body near the outside of the abutting part, there is no shortage of metal.

  Furthermore, the present invention is characterized in that, 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. And

  According to such a method, by temporarily joining the jacket body and the sealing body, the sealing body does not move during friction stir welding (hereinafter sometimes referred to as “main joining”). And it becomes easy to join and the positioning accuracy of a sealing body improves. Further, 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.

  Further, according to the present invention, the abutting portion has a rectangular frame 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. Later, 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.

  Further, according to the present invention, the abutting portion has a rectangular frame 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 temporarily placed. After joining, the intermediate part of the other opposite side is temporarily joined.

  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.

In the friction stir welding method for fixing the plate-like second member to the opening of the concave portion of the first member by friction stir welding,
A support surface consisting of a step bottom surface that is lowered by the same dimension as the thickness dimension of the second member is formed on the peripheral edge of the opening of the first member, and the second member is placed on the support surface. Abut the step side surface of the first member and the outer peripheral surface of the second member,
The pin tip of the rotating tool penetrates the support surface at a position closer to the inner side than the abutting portion between the step side surface of the first member and the outer peripheral surface of the second member, and the abutting against the flow side of the rotating tool. The second tool is fixed to the first member by forming a plasticized region by making a round along the abutting portion while rotating and moving the rotary tool so that the portion is positioned. Stir welding method.

  According to such a friction stir welding method, many plasticized regions can be formed on the joint surface between the support surface and the second member, and the joint area can be increased. Moreover, generation | occurrence | production of the cavity defect by the metal shortage in a butt | matching part can be prevented, and the joining strength of a butt | matching part can be raised. Therefore, the sealing performance of the joint portion between the first member and the second member can be improved.

  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. The cooling water is a heat transport fluid that transports heat generated by a CPU (not shown), which is a heat generator, to the outside. 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, a liquid cooling jacket 1 is a sealing body that seals an opening 12 of a recess 11 in a jacket body 10 having a recess 11 that is partially opened while cooling water (not shown) flows. 30 is fixed 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), and receives the heat generated by the CPU. Heat exchange with the circulating water. 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 heat diffusion sheet is a sheet for efficiently transferring 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 support surface 15 a is formed on the opening peripheral edge 12 a of the concave portion 11 of the jacket body 10, which is a stepped bottom surface that is lowered by one step on the bottom surface side of the concave portion 11. As shown in FIG. 4A, the height difference between the upper surface of the jacket body 10 and the support surface 15a is set to the same dimension H1 as the thickness dimension T1 of the sealing body 30. The support surface 15a is a surface which supports the sealing body 30, Comprising: The peripheral part 30a of the sealing body 30 is mounted on the support surface 15a. Further, the width W1 of the support surface 15a (the width of the portion on which the peripheral edge 30a of the sealing body 30 is placed) dimension W1 is the shoulder diameter (diameter of the shoulder part 51) dimension R1 of the rotary tool 50 used for friction stir welding. Is set larger than.

  As shown in FIG. 1, through-holes 16 and 16 for allowing cooling water to flow through the recess 11 are formed in a pair of wall portions 14 a and 14 a facing each other of the peripheral wall 14 around the recess 11. In the present 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 the intermediate portion in the depth direction of the recess 11. Is formed. In addition, the shape, number, and formation 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 cover plate portion 31 having the same outer shape (a square in the present embodiment) as the step side surface 15 b (see FIG. 1) of the jacket body 10. And a plurality of fins 32, 32... Provided on the lower surface of the lid plate portion 31.

  The fins 32 are provided to increase the surface area of the sealing body 30. 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... Extend in a direction (X-axis direction in FIG. 1) perpendicular to the wall portions 14 a, 14 a of the peripheral wall 14 in which the through holes 16, 16 are formed. Has been placed. 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 thereof are each wall portion of the peripheral wall 14. It is comprised so that the predetermined | prescribed space | interval may be spaced apart from the inner wall surface of 14a, 14a, respectively. The space between the end portions of the fins 32, 32... And the wall portion 14a is a flow path header portion 34 ((a in FIG. 3) that connects the flow path 33 formed by the fins 32, 32 and the through hole 16. ))).

  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 manufactured by forming a cover plate portion 31 and fins 32 by cutting a block formed of aluminum or an aluminum alloy. The manufacturing method is not limited to this. For example, a member having a cross-sectional shape including the lid plate portion 31 and the plurality of fins 32, 32... Is formed by extrusion molding or grooving. You may produce by removing both ends.

  Next, a method for 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 so that the fins 32 are on the lower side, and the peripheral portion 30a of the sealing body 30 is removed. Then, it is placed on the support surface 15a. Then, the step side surface 15b of the jacket main body 10 and the outer peripheral surface 30b of the sealing body 30 are abutted to form the abutting portion 40.

  Next, after the rotational tool 50 for friction stir welding is inserted into the insertion position 53, the friction stir welding rotary tool 50 is moved to a position closer to the inside of the abutting portion 40 and 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 outer 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 portion 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. In the present embodiment, the stirring pin 52 has a truncated cone shape with a reduced diameter at the lower portion, and the protruding length dimension is equal to or greater than the thickness dimension T1 of the lid plate portion 31 of the sealing body 30. At the time of friction stir welding, the rotary tool 50 is pushed so that the tip of the stirring pin 52 penetrates the support surface 15a. The rotational speed of the rotary tool 50 is 500 to 15000 (rpm), the feed rate is 0.05 to 2 (m / min), and the pushing force for pressing the abutting portion 40 is about 1 to 20 (kN). The sealing body 30 is appropriately selected according to the material, plate thickness, and shape.

  Hereinafter, the movement of the rotary tool 50 will be specifically described. First, the rotary tool 50 is inserted into the insertion position 53 while rotating. 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. A pilot hole (not shown) may be formed in advance at the insertion position 53 of the rotary tool 50. If it does in this way, the insertion time (pressing time) of the rotation tool 50 can be shortened.

  Thereafter, the rotary tool 50 is moved while being rotated from the insertion position 53 to a position closer to the inside than the abutting portion 40. As shown in FIG. 4A, the agitating pin 52 enters the inner side beyond the abutting surface of the abutting portion 40, and the outer side of the shoulder portion 51 does not exceed the abutting surface of the abutting portion 40. It is the position which is outside. That is, the shoulder portion 51 outside the stirring pin 52 is also a position that covers the abutting surface of the abutting portion 40.

  If the rotary tool 50 moves to a position closer to the inner side than the abutting portion 40, the center (axial center) of the rotating tool 50 keeps a certain distance from the abutting portion 40 as shown in FIG. The rotation tool 50 is moved while changing the moving direction so as to move in parallel along the abutting portion 40. At this time, as shown in FIGS. 3A and 4B, the rotary tool 50 rotates in the direction opposite to the moving direction of the rotary tool 50 (see arrow Y1 in FIGS. 3 and 4). The rotary tool 50 is rotated and moved so that the abutting portion 40 is positioned on the flow side 50a (see arrows Y2 in FIGS. 3 and 4). Specifically, the rotation direction (spinning direction) of the rotary tool 50 at the abutting portion 40 is set to be opposite to the moving direction (revolution direction). That is, in this embodiment, as shown in FIG. 3A, the rotary tool 50 is moved clockwise with respect to the opening 12 of the recess 11, and therefore the rotary tool 50 is rotated counterclockwise. When the rotary tool 50 is moved counterclockwise with respect to the opening 12 of the recess 11, the rotary tool 50 is rotated clockwise. By doing so, the relative speed of the outer periphery of the rotary tool 50 with respect to the abutting portion 40 becomes a value obtained by subtracting the magnitude of the moving speed from the magnitude of the tangential speed on the outer periphery of the rotary tool 50. Compared with the shear side 50b in which the rotary tool 50 rotates in the same direction as the moving direction, the speed is low.

  Subsequently, 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. After rotating the rotary tool 50 once, the rotary tool along the start end including the start end 54a of the first turn (a portion from the start end 54a to a position advanced by a predetermined length in the moving direction of the rotary tool 50 (the same position as the end end 54b)). 50 is moved by a predetermined length. Accordingly, the start end 54a and the end end 54b in the circumferential movement of the rotary tool 50 overlap each other, and a part of the plasticizing region 41 is configured to overlap.

  Then, when the circumferential movement of the rotary tool 50 is completed, the rotary tool 50 is moved to the upper surface of the peripheral wall 14 that is outside from the plasticizing region 41 (butting portion 40), and the rotary tool 50 is moved to that position. Pull out. In this way, the extraction position 55 of the rotary tool 50 is located outside the abutting portion 40, so that an extraction trace of the stirring pin 52 (see FIG. 4A) is formed in the abutting portion 40. Never happen. Thereby, the joining property of the jacket main body 10 and the sealing body 30 can further be improved. In addition, you may make it repair the drawing trace of the upper surface of the surrounding wall 14 by processing, such as filling a weld metal.

  As described above, the rotary tool 50 is made to make a round around the opening portion 12 of the recess 11 along the abutting portion 40 and friction stir welding is performed to form the plasticized region 41, and the sealing body 30 is formed on the jacket body 10. Is fixed to form the liquid cooling jacket 1.

  According to the manufacturing method and the friction stir welding method of the liquid cooling jacket 1 according to the present embodiment, the friction stir welding is performed at a position closer to the inner side than the abutting portion 40, thereby, as shown in FIG. Many plasticized regions 41 can be formed on the joint surface between 15 a and the lower surface of the sealing body 30. Thereby, the joining area of the jacket main body 10 and the sealing body 30 can be increased. In particular, by performing the friction stir welding so that the tip of the pin of the rotary tool 50 penetrates the support surface 15a, the plasticized region 41 is reliably formed on the joint surface between the support surface 15a and the lower surface of the sealing body 30. The

  Further, since the width dimension W1 of the support surface 15a is larger than the shoulder diameter dimension R1 of the rotary tool 50, the plasticized region 41 is not exposed in the concave portion 11, and the horizontal length of the plasticized region 41 is large. The portion can be positioned on the joint surface between the support surface 15 a and the lower surface of the sealing body 30. Further, since the plasticized region 41 is not exposed in the concave portion 11 and the inner peripheral wall of the concave portion 11 is not deformed, the volume of the flow path is not reduced and the cooling performance can be prevented from being lowered.

  Furthermore, since the friction stir welding is performed so that the shoulder portion 51 of the rotary tool 50 covers the abutting portion 40, the plasticized region 41 can be reliably formed over the entire abutting portion 40.

  As described above, in the present embodiment, the plasticized region 41 is widely formed not only on the abutting portion 40 extending in the vertical direction but also on the joint surface between the support surface 15a extending in the horizontal direction and the lower surface of the sealing body 30. Is done. Therefore, the joint area between the jacket body 10 and the sealing body 30 can be increased, and the sealing performance of the joint portion between the jacket body 10 and the sealing body 30 can be improved.

  In addition, the friction stir welding is performed by setting the moving direction and the rotation direction of the rotary tool 50 so that the abutting portion 40 is positioned on the flow side 50a of the rotating tool 50. The speed is reduced and the metal flow is reduced. Therefore, it is possible to prevent the occurrence of cavity defects due to lack of metal in the abutting portion, and it is possible to prevent the bonding strength of the abutting portion 40 from being lowered. Thereby, the sealing performance of the junction part of the jacket main body 10 and the sealing body 30 can be improved. In addition, since the shear side 50b located on the opposite side of the flow side 50a across the stirring pin 52 can be located in the region 56 far away from the abutting portion 40, there is no problem even if a cavity defect is formed.

  Further, in the present embodiment, the plasticizing region 41 overlaps at the starting end 54a and the terminal end 54b in the circumferential movement of the rotary tool 50, so that the plasticizing region is formed in the opening peripheral portion 12a of the recess 11. There is no portion where 41 is interrupted. Therefore, the peripheral wall 14 of the jacket main body 10 and the sealing body 30 can be favorably joined, and the heat transport fluid does not leak to the outside, so that the sealing performance of the joint can 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. 6A, the abutting portion 40 between the jacket body 10 and the sealing body 30 prior to the step of forming the plasticized region 41 with the rotary tool 50 of the first embodiment. Is temporarily joined using a rotary tool 60 for temporary joining which is smaller than the rotary tool 50. After performing temporary joining, the main joining similar to 1st Embodiment is performed using the rotation tool 50 (refer FIG.6 (b)).

  The temporary joining rotary tool 60 includes a shoulder portion and a stirring pin (not shown) having a smaller diameter than the rotary tool 50, and the plasticized region 45 to be formed is formed by the rotary tool 50 in a later step. The width is smaller than the width of the plasticized region 41 (see FIG. 6B). And the plasticization area | region 45 is formed in the position which does not protrude from the position where the plasticization area | region 41 is formed in a next process. 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 frame shape), and in the step of temporarily joining the abutting portion 40 with the temporary joining rotary tool 60, The diagonals 44a and 44b are provisionally joined first, and then the other diagonals 44c and 44d are provisionally 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. 7A, the abutting portion 40 between the jacket body 10 and the sealing body 30 prior to the step of forming the plasticized region 41 with the rotary tool 50 of the first embodiment. Is temporarily joined using a rotary tool 60 for temporary joining which is 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 square butt 40. ing. Specifically, the abutting portion 40 has a square shape (rectangular frame shape), and in the step of temporarily joining the abutting portion 40 with the temporary joining rotary tool 60, an intermediate portion between one opposite side 46, 46 of the abutting portion 40. After temporarily joining 46a and 46b, the intermediate parts 47a and 47b of the other opposite sides 47 and 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 addition, the plasticized region 48 is formed at a position that does not protrude from the position where the plasticized region 41 is formed in a later step.

  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. 8 and 9.

  As shown in FIG. 8, this embodiment is characterized in that the rotation tool 50 is rotated once (including a portion where a part of the plasticized region 41 overlaps), and then the moving direction is reversed and the rotation tool 50 is rotated once again. Further, the movement trajectory of the second rotation tool 50 is shifted outward from the plasticizing region 41 formed by the movement in the first rotation of the rotation tool 50.

  Specifically, first, as shown in FIG. 8A, the sealing body 30 is inserted into a concave portion (not shown) of the jacket main body 10, and the peripheral portion 30 a of the sealing body 30 is formed into the concave portion. Then, the rotating 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 54a closer to the inner side than the abutting surface of the abutting portion 40, and further moved along the abutting portion 40 to form the plasticized region 41 up to the end 54b of the first round. The steps so far are the same as in the first embodiment. The first rotation of the rotary tool 50 is clockwise with respect to the abutting portion 40 (see arrow Y1 in FIG. 8A), and the rotation direction of the rotary tool 50 is counterclockwise ( (See arrow Y2 in FIG. 8A).

  Thereafter, as shown in FIG. 8B, the moving direction of the rotary tool 50 is turned back at the end 54b of the first turn and moved counterclockwise (see arrow Y3 in FIG. 8). At this time, the movement trajectory of the rotary tool 50 is shifted outward from the end 54b of the first round. The deviation of the rotary tool 50 moves obliquely so as to go outward in the moving direction (arrow Y3), until the axial center of the rotary tool 50 is located on the abutting surface of the abutting portion 40. Shift. Thereafter, the rotary tool 50 translates along the plasticizing region 41 (along the abutting portion 40). When entering the second round of movement, the rotating tool 50 is not replaced and remains inserted into the abutting portion 40, and the rotation direction is the left rotation as in the first round (in FIG. 8B, the arrow Y2) is continued and the push-in 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. The second plasticizing region 43 that further agitates the plasticizing region 41 formed in the first round is formed by the second round in which the rotary tool 50 moves in the opposite direction to the first round and rotates in the same direction.

  Then, as shown in FIG. 8C, when the movement of the second turn of the rotary tool 50 is completed (in this embodiment, the rotary tool 50 is moved to a position equivalent to the start end 54a of the first turn), the rotary tool 50 is moved. It moves to the upper surface of the surrounding wall 14 which removed outside from the 2nd plasticization area | region 43 (butting part 40), and the rotary tool 50 is pulled out in the position. The extraction position 55 where the rotary tool 50 is extracted is the same as the insertion position 53. Since the drawing position 55 is a position deviated to the outside from the abutting portion 40, the drawing trace is not formed in the abutting portion 40, and the bondability between the jacket body 10 and the sealing body 30 is further improved. Can do. In addition, you may make it repair a drawing trace.

  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 rotation tool 50 is rotated once to form the plasticized region 41, and then the rotation tool 50 is further rotated along the plasticization region 41 to further agitate the plastic tool region 41. A two-plasticized region 43 is formed. That is, since the defect repair of the plasticized region 41 can be automatically performed, the sealing performance of the joint can be further improved, and the highly reliable liquid cooling jacket 1 can be supplied.

  Furthermore, by making the moving direction in the first and second rounds of the rotating tool 50 reverse, the plasticized regions 41 and 43 are agitated in opposite directions in the first and second rounds. Stirred. Therefore, cavity defects can be further reduced, and the sealing performance of the joint can be improved.

  Further, the rotation tool 50 is shifted outside the plasticizing region 41 formed closer to the inside of the abutting portion 40 due to the movement of the rotation tool 50 in the first turn of the rotation tool 50. Is located in the vicinity of the abutting portion 40 (on the abutting surface of the abutting portion 40 in this embodiment). As a result, the shear side 50 b of the rotary tool 50 becomes a thick portion of the jacket body 10 closer to the outer side than the abutting portion 40. Therefore, even on the shear side 50b, since the periphery thereof is thick, the metal does not fall short, and a cavity defect is unlikely to occur. Even if a cavity defect occurs, there is no problem because the region 57 (see FIG. 9) is separated from the abutting portion 40. Therefore, it becomes difficult for the heat transport fluid to leak to the outside, and the sealing performance of the joint portion between the jacket body 10 and the sealing body 30 can be further improved.

  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, the fin 32 provided in the sealing body 30 may be a separate body from the lid plate portion. For example, the fin 32 may be separately housed in the recess 11 or provided integrally with the jacket body. It is good.

  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), (b) is a top view for demonstrating the manufacturing method of the liquid cooling jacket which concerns on 1st Embodiment. It is the figure which showed the friction stir welding of the manufacturing method of the liquid cooling jacket which concerns on 1st Embodiment, Comprising: (a) is sectional drawing, (b) is a top view. It is sectional drawing which showed the plasticization area | region formed with the manufacturing method of the liquid cooling jacket which concerns on 1st Embodiment. (A), (b) is a top view for demonstrating the manufacturing method of the liquid cooling jacket which concerns on 2nd Embodiment. (A), (b) is a top view for demonstrating the manufacturing method of the liquid cooling jacket which concerns on 3rd Embodiment. (A)-(c) is a top view for demonstrating the manufacturing method of the liquid cooling jacket which concerns on 4th Embodiment. It is sectional drawing which showed the plasticization area | region formed with the manufacturing method of the liquid cooling jacket which concerns on 4th Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid cooling jacket 10 Jacket main body 11 Recessed part 12 Opening part 12a Opening peripheral part 15a Support surface (step bottom)
15b Stepped side surface 30 Sealed body 30b Outer peripheral surface 40 Abutting portion 41 Plasticizing region 50 Rotating tool 50a Flow side 60 Rotating tool for temporary joining H1 (Difference in height between the upper surface of the jacket body and the support surface) Size T1 ) Thickness dimension R1 Shoulder diameter dimension W1 (Support surface) width dimension

Claims (9)

A sealing body that seals the opening of the recess is fixed by friction stir welding to a jacket body that has a recess that is partially open while a heat transport fluid that transports heat generated by the heat generator flows to the outside. In the manufacturing method of the liquid cooling jacket constituted,
Forming a support surface consisting of a step bottom surface that is lowered by the same dimension as the thickness dimension of the sealing body on the peripheral edge of the opening of the recess of the jacket body, and placing the sealing body on the support surface The step side of the jacket body and the outer peripheral surface of the sealing body are butted,
At the position closer to the inside than the abutting portion between the step side surface of the jacket body and the outer peripheral surface of the sealing body, the pin tip of the rotating tool penetrates the support surface, and the abutting portion on the flow side of the rotating tool The rotating tool is rotated and moved so as to be positioned so as to make a round along the abutting portion to form a plasticized region, and the sealing body is fixed to the jacket body. The manufacturing method of a jacket. The method for manufacturing a liquid cooling jacket according to claim 1, wherein a width dimension of the support surface is larger than a shoulder diameter dimension of the rotary tool. The method for manufacturing a liquid cooling jacket according to claim 1, wherein the rotating tool moves along the abutting portion such that a shoulder portion covers the abutting portion. The rotating tool is moved around along the starting end of the first turn after the rotating tool makes a round along the abutting portion, and a part of the plasticizing region is overlapped. The manufacturing method of the liquid cooling jacket of any one of Claim 3. After moving the rotating tool along the starting end of the first turn, the moving direction of the rotating tool is reversed, and the pin of the rotating tool is biased toward the outer peripheral side of the plasticizing region formed in the first turn. The manufacturing method of the liquid cooling jacket according to claim 4, wherein the plasticizing region is re-stirred by moving the rotating tool once again along the abutting portion. 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 5. The abutting portion has a rectangular frame 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. 6. A method for producing a liquid-cooled jacket according to 6. The abutting portion has a rectangular frame 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 6. In the friction stir welding method for fixing the plate-like second member to the opening of the concave portion of the first member by friction stir welding,
A support surface consisting of a step bottom surface that is lowered by the same dimension as the thickness dimension of the second member is formed on the peripheral edge of the opening of the first member, and the second member is placed on the support surface. Abut the step side surface of the first member and the outer peripheral surface of the second member,
The pin tip of the rotating tool penetrates the support surface at a position closer to the inner side than the abutting portion between the step side surface of the first member and the outer peripheral surface of the second member, and the abutting against the flow side of the rotating tool. The second tool is fixed to the first member by forming a plasticized region by making a round along the abutting portion while rotating and moving the rotary tool so that the portion is positioned. Stir welding method.

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