JP7318201B2 - manufacturing method, structure - Google Patents

Description

The present invention relates to manufacturing methods and structures.

In recent years, in a cooling device composed of members formed using an aluminum material such as aluminum or an aluminum alloy, soldering or brazing is performed to join the members formed using an aluminum material. is proposed.
For example, in the liquid-cooling type cooling device described in Patent Document 1, an aluminum inlet header is brazed to one end face of the inflow portion of the coolant flow, and an aluminum outlet header is brazed to one end face of the outflow portion. An aluminum intermediate header is brazed to the other end face of the cooling liquid circulation body.
Further, as a method for joining members formed using an aluminum material, Patent Document 2 proposes performing laser welding.

JP 2016-161158 A JP-A-4-270088

Laser welding may be used to join members formed using an aluminum material (hereinafter sometimes referred to as "aluminum material"). However, when laser welding is performed, the laser-welded portion thermally shrinks and deforms, causing the non-laser-welded portion to be displaced (warped), which may result in a different shape from the desired shape. be. Therefore, in order to obtain a desired shape, a process of re-displacing the displaced (warped) shape due to laser welding is required after laser welding.
SUMMARY OF THE INVENTION It is an object of the present invention to provide a manufacturing method and the like that can easily form a desired shape even if laser welding is performed.

The present invention completed for this purpose joins the first member and the second member by irradiating the second member superimposed on the plate-shaped first member with a laser beam. and a melting step of melting the surface of the first member opposite to the surface on which the second member is superimposed.
Here, the bonding step is performed prior to the melting step, and in the melting step, the second member is bonded in the first member to which the second member is bonded in the bonding step. The surface on the opposite side of the surface may be melted.
Further, the melting step is performed prior to the bonding step, and in the bonding step, the surface of the first member on which the melted portion is formed in the melting step is opposite to the surface on which the melted portion is formed. You may join said 2nd member to the surface of.
Further, in the melting step, the first member may be irradiated with a laser beam.
Further, in the melting step, the laser beam may be applied to the same position as the irradiation position in the bonding step when viewed in a direction orthogonal to the plate surface of the first member.
Further, in the melting step, when viewed in a direction orthogonal to the plate surface of the first member, the laser beams are placed at predetermined intervals on both sides in the longitudinal direction centering on the irradiation position in the bonding step. Light may be applied.
In addition, from another point of view, the present invention is directed to a plate-shaped first member made of an aluminum material and a second member made of an aluminum material that are butted against each other by irradiating the first member with a laser beam. A manufacturing method comprising: a joining step of joining a member and the second member; and a melting step of melting a side of the butted portion opposite to the side irradiated with the laser beam in the joining step. .
Here, in the melting step, the butted portion may be irradiated with a laser beam from a side opposite to the side irradiated with the laser beam in the bonding step.
In addition, from another point of view, the present invention is such that a second member superimposed on a plate-like first member is irradiated with a laser beam, whereby the first member and the second member overlap each other. The joined structure has a fusion zone on the surface of the first member opposite to the surface on which the second member is superimposed.
Here, the fusion zone is formed at the same position as the irradiation position for joining the first member and the second member when viewed in a direction orthogonal to the plate surface of the first member. It's okay to be.
In addition, when viewed in a direction orthogonal to the plate surface of the first member, the fusion zone is longitudinally centered on the irradiation position for joining the first member and the second member. may be formed at positions spaced apart from each other by a predetermined distance.
In addition, from another point of view, the present invention provides a structure in which a plate-like first member made of an aluminum material and a second member made of an aluminum material are abutted against each other by irradiating the first member with a laser beam. A structure in which a member and the second member are joined together, and the structure has a melted portion on the surface of the butted portion opposite to the surface on which the welded portion is formed by the irradiation of the laser beam. be.

ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method etc. which can be easily made into a desired shape even if laser welding is performed can be provided.

1 is a perspective view of a liquid-cooled cooling device according to a first embodiment; FIG. FIG. 2 is an exploded view of parts constituting the liquid-cooled cooling device according to the first embodiment; 2 is a cross-sectional view taken along line III-III of FIG. 1; FIG. FIG. 2 is a sectional view taken along line IV-IV of FIG. 1; It is a perspective view explaining the laser welding process in an overlapping part. (a) is a top view of the liquid-cooled cooling device. (b) is a bottom view of the liquid-cooled cooling device. 2(a) is a cross-sectional view taken along line VII-VII of FIG. 1; FIG. (b) is an enlarged view of the VIIb portion of (a). (a) to (d) are diagrams schematically showing deformation of the device main body. (a) is a diagram showing a first modification of the shape of a fusion zone. (b) is a diagram showing a second modification of the shape of the fusion zone. (a) to (d) are diagrams schematically showing modifications of a device main body manufactured by a modification of the method for manufacturing a liquid-cooled type cooling device. It is the figure which looked at the liquid cooling type cooling device which concerns on 2nd Embodiment from the downward direction. (a) to (d) are diagrams schematically showing deformations of the main body of the liquid-cooling type cooling device according to the second embodiment. It is the figure which looked at the liquid cooling type cooling device which concerns on 2nd Embodiment from the downward direction. (a) and (b) are diagrams showing modifications of the cross-sectional shape of the fusion zone.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings.
<First Embodiment>
FIG. 1 is a perspective view of a liquid cooling system 1 according to the first embodiment.
FIG. 2 is an exploded view of parts constituting the liquid cooling system 1 according to the first embodiment.
FIG. 3 is a cross-sectional view taken along line III--III in FIG.
FIG. 4 is a cross-sectional view taken along line IV-IV in FIG.
A liquid-cooling type cooling device 1 according to an embodiment includes a device main body 10 in which a cooling liquid flows, and a changing member 20 that changes the flow direction of the cooling liquid that flows through the device main body 10 . The liquid-cooled cooling device 1 also includes an inlet joint 30 for inflowing cooling liquid from the outside of the device main body 10 to the inside, and an outlet joint 40 for allowing the cooling liquid to flow out from the inside of the device main body 10 to the outside. .

(Device body 10)
The device main body 10 is a rectangular parallelepiped member. The device main body 10 is formed using an extruded material of JIS A6063 alloy formed by extrusion, and is formed into a long shape so that the extrusion direction is the longitudinal direction. Further, as shown in FIG. 1, the longitudinal and lateral lengths of the device main body 10 are greater than the vertical length. Incidentally, the temper of JIS A6063 alloy can be exemplified as T0 or T6. Although other tempers may be used, it is desirable that the hardness of the device main body 10 is 42 (HV (Vickers hardness)) or more.

A plurality of through holes 11 are formed in the interior of the device main body 10 so as to penetrate from one end portion to the other end portion in the longitudinal direction. In the liquid cooling type cooling device 1 according to the present embodiment, as shown in FIG. 4, the through holes 11 are provided on the front side of the central portion in the lateral direction and on the rear side of the central portion. are formed.

The six through-holes 11 on the front side function as inflow-side flow passages 111 through which coolant flows through the inlet joint 30 and before reaching the change member 20 . Adjacent inflow-side channels 111 are partitioned by inflow side walls 111a.
On the other hand, the six through-holes 11 on the far side function as outflow-side passages 112 through which the coolant flows after passing through the change member 20 and before reaching the outlet joint 40 . Adjacent outflow-side channels 112 are partitioned by outflow side walls 112a.

In addition, two spaces 12 recessed from the upper surface are formed in the central portion of the apparatus main body 10 in the longitudinal direction. One of the two spaces 12 is an inflow-side space 121 formed to communicate with the inflow-side channel 111, and the other is an outflow-side space formed to communicate with the outflow-side channel 112. 122.

The inflow-side space 121 is a space formed by removing the upper wall 13 and the inflow side wall 111a by, for example, cutting. It is formed by the lower space 121b. In addition, in the example shown in FIG. 2, the inflow side wall 111a is completely removed from the upper side to the lower side, but a part of the upper side may be removed and the lower part may remain. Further, the inflow-side space 121 may be formed by removing the upper wall 13 and the inflow side wall 111a, for example, by cutting, and also by removing the upper portion of the lower wall 14, for example, by cutting. good.

The outflow side space 122 is a space formed by removing the upper wall 13 and the outflow side wall 112a by, for example, cutting. It is formed by the lower space 122b. In the example shown in FIG. 2, the outflow side wall 112a is completely removed from the upper side to the lower side, but the upper side may be partially removed and the lower side may remain. Further, the outflow side space 122 may be formed by removing the upper wall 13 and the outflow side wall 112a by cutting, for example, and also by removing the upper part of the lower wall 14 by cutting, for example. good.

(Change member 20)
The changing members 20 are arranged at both longitudinal ends of the apparatus main body 10 .
The change member 20 is a rectangular parallelepiped member and has a concave portion 21 recessed from the end face on the apparatus main body 10 side. The inflow-side channel 111 and the outflow-side channel 112 are communicated with each other by the concave portion 21 .
The change member 20 is joined by applying laser welding to the abutting portion in a state in which the end face on the side of the device main body 10 and the end face in the longitudinal direction of the device main body 10 are butted. Thus, the change member 20 is an example of a member to be joined to be joined to the device main body 10 by laser welding.

For example, the modified member 20 may be formed by subjecting a strip made of a JIS A3000 series alloy of temper grade O to deep drawing. Alternatively, the change member 20 may be formed by cutting a material made of, for example, a JIS A3000 series alloy with a temper of H14 or a JIS A1000 series aluminum with a temper of H14.

(Inlet joint 30)
The inlet joint 30 has a cylindrical inlet pipe 31 arranged so that the center line direction is the vertical direction, and a holding member 32 that holds the inlet pipe 31 .

The inlet pipe 31 has an upper-end protrusion 311 that protrudes radially outward over the entire circumference, and a portion closer to the lower end that extends radially outward over the entire circumference. and a projecting lower end side projecting portion 312 .
A portion of the inlet pipe 31 on the lower end side of the lower end side projecting portion 312 is inserted into a through hole 321 formed in the holding member 32 and described later.
The holding member 32 is a generally plate-like rectangular parallelepiped member, and has a circular through-hole 321 formed in the central portion thereof. The holding member 32 is formed using a plate material of JIS A3003 alloy. Incidentally, the temper of the JIS A3003 alloy can be exemplified as H12 or H18. Although other tempers may be used, it is desirable that the hardness of the holding member 32 is 35 (HV) or more.

The inlet pipe 31 can be exemplified such that the lower end side portion of the inlet pipe 31 is brazed while being inserted into the through hole 321 formed in the holding member 32 . A fillet 33 made of melted brazing material is formed between the outermost diameter portion of the lower end side projecting portion 312 and the holding member 32 . Note that the inlet pipe 31 and the holding member 32 may be joined by laser welding. In the case of laser welding, a laser beam is applied from the lower surface side of the holding member 32 while the portion of the inlet pipe 31 on the lower end side of the lower end side projecting portion 312 is inserted into the through hole 321 formed in the holding member 32 . Irradiation can be exemplified.

The inlet joint 30 is in a state in which the lower end of the inlet pipe 31 is inserted into the inlet-side space 121 of the apparatus main body 10 and the lower end surface of the holding member 32 is placed on the upper surface of the apparatus main body 10 (the holding member 32 and the apparatus main body are separated from each other). 10 are superimposed), and are joined by laser welding. Thus, the holding member 32 is an example of a member to be joined to the device main body 10 by laser welding.

(Exit joint 40)
The outlet joint 40 is a member similar to the inlet joint 30, and has a cylindrical outlet pipe 41 arranged so that the center line direction is the vertical direction, and a holding member 42 that holds the outlet pipe 41. ing.

The outlet pipe 41 has an upper end-side projecting portion 411 that protrudes radially outward over the entire circumference provided in a portion closer to the upper end, and an upper end-side projecting portion 411 that is provided in a portion closer to the lower end and extends radially outward over the entire circumference. and a projecting lower end side projecting portion 412 .
A portion of the outlet pipe 41 on the lower end side of the lower end side projecting portion 412 is inserted into a through hole (not shown) formed in the holding member 42 and described later.
The holding member 42 is a generally plate-shaped rectangular parallelepiped member, and has a circular through hole (not shown) formed in the center. Like the holding member 32, the holding member 42 is formed using a JIS A3003 alloy plate material. Incidentally, the temper of the JIS A3003 alloy can be exemplified as H12 or H18. Although other tempers may be used, it is desirable that the hardness of the holding member 42 is 35 (HV) or more.

The outlet pipe 41 can be exemplified by inserting a portion of the outlet pipe 41 on the lower end side than the lower end side projecting portion 412 into a through hole (not shown) formed in the holding member 42 and brazing. A fillet 43 made of melted brazing material is formed between the outermost diameter portion of the lower end side projecting portion 412 and the holding member 42 . Note that the outlet pipe 41 and the holding member 42 may be joined by laser welding. In the case of laser welding, a laser beam is irradiated from the lower surface side of the holding member 42 while the portion of the exit pipe 41 on the lower end side of the lower end side protrusion 412 is inserted into the through hole formed in the holding member 42. can be exemplified.

The outlet joint 40 is in a state in which the lower end of the outlet pipe 41 is inserted into the outflow side space 122 of the apparatus main body 10 and the lower end surface of the holding member 42 is placed on the upper surface of the apparatus main body 10 (the holding member 42 and the apparatus main body are separated from each other). 10 are superimposed), and are joined by laser welding. Thus, the holding member 42 is an example of a member to be joined to the device main body 10 by laser welding.

(Action of Liquid Cooling System 1)
In the liquid-cooled cooling device 1 configured as described above, the liquid-cooled cooling device 1 is provided on the upper surface of the device main body 10 and outside in the longitudinal direction the portion where the inlet joint 30 and the outlet joint 40 are provided. An object to be cooled by the device 1 is placed thereon. The object to be cooled can be exemplified by an assembled battery 100 composed of a plurality of rectangular parallelepiped single cells 101 .

In the liquid cooling type cooling device 1 , the cooling liquid that has flowed from the inlet pipe 31 of the inlet joint 30 into the inflow-side space 121 of the device main body 10 passes through the inflow-side channel 111 and enters the concave portion 21 of the changing member 20 . up to. The coolant that has reached the recess 21 of the change member 20 then passes through the outflow-side channel 112 to reach the outflow-side space 122 and flows out from the outlet pipe 41 of the outlet joint 40 . In this manner, the cooling liquid cools the assembled battery 100 placed on the upper surface of the device main body 10 while flowing through the inflow channel 111 and the outflow channel 112 of the device main body 10 .

(Manufacturing method of liquid cooling type cooling device 1)
The liquid cooling system 1 configured as described above is manufactured as follows.
With the end faces of both ends of the device main body 10 in the longitudinal direction and the end face of the changing member 20 on the device main body 10 side facing each other, the butted portions are continuously irradiated with a laser beam. In this manner, the changing members 20 are joined to the longitudinal ends of the apparatus main body 10 by laser welding.
By irradiating the butted portion with the laser beam, the welded portion 22 (see FIG. 3) is formed at substantially the same position as the butted portion.

Also, the lower end of the inlet pipe 31 of the inlet joint 30 is inserted into the inflow-side space 121 of the apparatus main body 10, and the lower end surface of the holding member 32 of the inlet joint 30 is placed on the upper surface of the apparatus main body 10 (the holding member 32 and the apparatus main body 10). Then, in a state where the holding member 32 and the apparatus main body 10 are overlapped, the holding member 32 is irradiated with laser light, and the periphery of the inlet pipe 31 is continuously irradiated with laser light. In this manner, the inlet joint 30 is joined to the central portion of the device main body 10 by laser welding.
By irradiating the overlapped portion with the laser beam, the welded portion 34 (see FIG. 3) is formed at substantially the same position as the irradiated position.

Similarly, the lower end of the outlet pipe 41 of the outlet joint 40 is inserted into the outflow side space 122 of the device main body 10, and the lower end surface of the holding member 42 of the outlet joint 40 is placed on the upper surface of the device main body 10 (the holding member 42 and the device the main body 10). Then, while the holding member 42 and the apparatus main body 10 are overlapped, the holding member 42 is irradiated with laser light, and the periphery of the outlet pipe 41 is continuously irradiated with the laser light. In this manner, the outlet joint 40 is joined to the central portion of the apparatus main body 10 by laser welding.
A welded portion 44 (see FIG. 1) is formed at substantially the same position as the irradiated position by irradiating the overlapping portion with the laser beam.

In the liquid cooling type cooling device 1 according to the present embodiment, the surface (lower surface) opposite to the surface (upper surface) on which the holding member 32 (holding member 42) is superimposed is melted. . Then, in the present embodiment, the lower wall 14 of the device main body 10 is irradiated with a laser beam in order to melt the lower surface of the device main body 10 . By irradiating the lower surface (lower surface) of the lower wall 14 of the apparatus main body 10 with laser light, a melted portion 15 is formed at the irradiated position.

(laser welding process)
FIG. 5 is a perspective view explaining the laser welding process in the overlapped portion.
As shown in FIG. 5, the holding member 32 (holding member 42) of the laser device 150 is attached to the holding member 32 of the inlet joint 30 (holding member 42 of the outlet joint 40) at the overlapping portion of the device main body 10 and the holding member 42 of the outlet joint 40. A laser beam L is emitted from the laser head 151 . Then, the laser head 151 is moved along the end shape of the holding member 32 (holding member 42) around the inlet pipe 31 (outlet pipe 41), thereby continuously irradiating the laser light L.
Note that the laser source of the laser device 150 is not particularly limited. YAG lasers, _CO2 lasers, fiber lasers, disk lasers, semiconductor lasers can be exemplified. Further, the irradiation direction of the laser light L may be a direction perpendicular to the surface of the holding member 32 (holding member 42) of the overlapping portion, or may be a direction inclined with respect to the perpendicular direction.
In addition, the laser head 151 irradiates the laser light L toward the abutting portion between the device main body 10 and the change member 20 . Then, the laser beam is continuously irradiated by moving the laser head 151 along the shape of the butted portion.

(Regarding the relationship between the welded portion 34 and the welded portion 44 and the fusion portion 15)
FIG. 6(a) is a top view of the liquid cooling system 1. FIG. FIG. 6(b) is a diagram of the liquid-cooled type cooling device 1 as viewed from below.
As shown in FIG. 6( a ), a welded portion 34 is formed around the entrance pipe 31 by laser welding the overlapped portion of the device main body 10 and the holding member 32 of the entrance joint 30 . It is formed along the edge shape of the member 32 . Further, as shown in FIG. 6A, a welded portion 44 is formed around the outlet pipe 41 by performing laser welding on the overlapping portion of the device main body 10 and the holding member 42 of the outlet joint 40. , along the edge shape of the holding member 42 .

In the liquid cooling type cooling device 1 according to the present embodiment, when viewed in a direction (vertical direction) perpendicular to the plate surface (upper surface) of the device main body 10, as shown in FIG. A laser beam (not shown) is irradiated so as to form the melted portion 15 at the same position as the welded portion 34 and the welded portion 44 . For example, the lower wall 14 (lower surface) of the device main body 10 is irradiated with laser light from the laser head 151 of the laser device 150 . By moving the laser head 151 around the lower space 121b of the inflow-side space 121 and around the lower space 122b of the outflow-side space 122, laser light is emitted continuously.
It should be noted that the conditions such as the spot diameter, power, and moving speed for irradiating the laser beam to form the melted portion 15 are determined by adjusting the apparatus main body 10 and the holding member 32 of the inlet joint 30 (the holding member 42 of the outlet joint 40). It can be exemplified that the conditions are the same as those of the laser light L (see FIG. 5) irradiated for bonding. Moreover, in order to form the melted portion 15, the laser beam may be irradiated multiple times at intervals. For example, the laser head 151 may be rotated multiple times around the lower space 121b of the inflow-side space 121 and the lower space 122b of the outflow-side space 122 to continuously irradiate the laser beam. can.

FIG. 7(a) is a sectional view taken along the line VII--VII in FIG. FIG. 7(b) is an enlarged view of the VIIb portion of FIG. 7(a).
7(a) and 7(b) show the cross-sectional shape of the welded portion 34 of the overlapping portion between the holding member 32 of the inlet joint 30 and the device main body 10, and the cross-sectional shape of the fusion portion 15. FIG.
The holding member 32 is made of an aluminum material and forms the overlapping portion by irradiating the holding member 32 with the laser beam L from the laser head 151 of the laser device 150 and converting the energy of the laser beam L into heat. 32 and the base material of the apparatus main body 10 are melted and then rapidly cooled. This rapid heating and rapid cooling causes structural change in the welded portion 34, and the welded portion 34 is composed of a melted portion 34m that has melted and hardened and a heat affected zone 34h that has undergone a structural change due to the welding heat. The heat-affected portion 34 h is composed of the heat-affected portion 32 h of the holding member 32 and the heat-affected portion 10 h of the apparatus main body 10 . Although illustration is omitted, the welded portion 44, like the welded portion 34, is composed of a melted portion (not shown) that has melted and solidified, and a heat-affected zone (not shown) that has undergone a structural change due to the welding heat. be done.

In addition, when the laser head 151 of the laser device 150 irradiates the lower wall 14 of the device main body 10 with laser light, the base material of the device main body 10 melts and then rapidly cools. By this rapid heating and rapid cooling, a melted zone 15 that is melted and hardened and a heat affected zone (not shown) in which structural change occurs due to the welding heat are formed.

In the liquid cooling system 1 according to the present embodiment, the melted portion 34m of the welded portion 34, the melted portion of the welded portion 44, and the melted portion 15 are formed so as not to reach the through hole 11. there is In other words, the melted portion 34m and the melted portion 15 do not reach the inflow-side channel 111 and the outflow-side channel 112 through which the coolant flows (see FIG. 7A). This suppresses an increase in pressure loss due to obstruction of the flow of the cooling liquid flowing through the inflow-side channel 111 or the outflow-side channel 112 .

The liquid-cooled cooling device 1 manufactured by the manufacturing method described above has the following effects.
FIGS. 8(a) to 8(d) are diagrams schematically showing deformation of the device main body 10. FIG.
When the laser beam L is irradiated to join the apparatus main body 10 and the holding member 32 of the inlet joint 30, the energy of the laser beam L is converted into heat, and then the melted portion 34m is formed (FIG. 8A). reference). At that time, the upper part of the device main body 10 where the fusion zone 34m is formed and the region of the device main body 10 where the fusion zone 34m is not formed (the region below the fusion zone 34m (for example, the lower part)) in the laser-welded region. Due to the difference in thermal contraction, the entire apparatus main body 10 is deformed so that the lower portion of the apparatus main body 10 at the laser-welded portion becomes convex (see FIG. 8B). Since the device main body 10 is elongated, the amount of displacement increases toward the longitudinal ends of the device main body 10, and the device main body 10 moves upward from the position before laser welding. In other words, if the position before laser welding is the desired position, laser welding may cause the difference in thermal contraction between the upper portion and the lower portion of the laser-welded portion. The position of the part where laser welding is not performed moves upward from the position before laser welding is performed, and the shape of the device main body 10 is deformed from the desired shape. Therefore, even if the lower surface of the device main body 10 before laser welding satisfies the flatness required for the liquid-cooling type cooling device 1, laser welding does not satisfy the required flatness. There is a risk. If the lower surface of the device main body 10 does not satisfy the required flatness, a step of deforming is required so as to satisfy the required flatness.

In the liquid-cooled cooling device 1 according to the present embodiment, when the melted portion 15 is formed by irradiating the lower surface of the device main body 10 (the lower surface of the lower wall 14) with the laser beam (Fig. 8(c)), the lower portion of the device body 10 where the melted portion 15 is formed in the portion irradiated with the laser beam, and the portion of the device body 10 where the melted portion 15 is not formed (the portion above the melted portion 15) (For example, the upper part)), the entire apparatus main body 10 is deformed so that the upper part of the apparatus main body 10 becomes convex (see FIG. 8D). Since the positions of the melted portion 34m and the melted portion 15 in the longitudinal direction are the same, the deformation of the entire device body 10 caused by the laser beam irradiation for joining the device body 10 and the holding member 32 of the entrance joint 30 and the deformation of the entire apparatus body 10 due to the laser beam irradiation for melting the lower wall 14 are offset. As a result, even if laser welding is performed to join the device main body 10 and the holding member 32 of the inlet joint 30 (the holding member 42 of the outlet joint 40), the lower surface of the device main body 10 satisfies the required flatness. becomes easier. That is, even if laser welding is performed to join the device main body 10 and the holding member 32 of the inlet joint 30 (the holding member 42 of the outlet joint 40), the lower surface of the device main body 10 is joined by, for example, brazing. It becomes possible to make the flatness equal to or less than the case.

Further, according to the method of forming the melted portion 15 by irradiating a laser beam, the size of the apparatus is increased due to laser welding for joining the apparatus main body 10 and the holding member 32 (holding member 42). In order to reduce the flatness of the lower surface of the main body 10, the flatness can be reduced more easily than in the case of adopting another method, for example, a method of applying force to both ends of the device main body 10 in the longitudinal direction.
Furthermore, the conditions for irradiating the laser beam to form the melted portion 15, such as the spot diameter, are set to the conditions for joining the apparatus main body 10 and the holding member 32 of the inlet joint 30 (the holding member 42 of the outlet joint 40). By making it the same as , the flatness can be reduced more easily.
However, the means for forming the fusion zone 15 is not limited to irradiation with laser light. For example, arc discharge may be used to form the fusion zone 15 .

Further, in the liquid-cooling type cooling device 1 according to the present embodiment, by moving the laser head 151 toward the butted portion between the device main body 10 and the change member 20 one round around the butted portion, A laser beam is continuously irradiated to form a welded portion 22 over one circumference. As a result, when viewed in a direction (vertical direction) orthogonal to the plate surface (upper surface or lower surface) of the apparatus main body 10, the welded portion 22 on the upper wall 13 of the apparatus main body 10 and the welded portion 22 on the lower wall 14 be in the same position. Therefore, deformation of the entire device body 10 due to laser beam irradiation for joining the butted portion between the upper wall 13 of the device main body 10 and the changing member 20 and joining of the butted portion between the lower wall 14 and the changing member 20 The deformation of the entire device main body 10 due to the laser beam irradiation for the adjustment is canceled out. As a result, even if laser welding is performed to join the butted portions of the device main body 10 and the change member 20, the required flatness of the lower surface of the device main body 10 can be easily satisfied. In other words, even if laser welding is performed to join the butted portions of the device main body 10 and the change member 20, the flatness of the lower surface of the device main body 10 is equal to or lower than that in the case of joining by brazing, for example. becomes possible.

(Modified example of the shape of the fusion zone 15)
FIG. 9A is a diagram showing a first modification of the shape of the fusion zone 15. FIG. FIG. 9B is a diagram showing a second modification of the shape of the fusion zone 15. As shown in FIG.
The fusion zone 15 described with reference to FIG. 6(b) can be seen in a direction (vertical direction) perpendicular to the plate surface (upper surface or lower surface) of the apparatus main body 10 and the holding member 32 (holding member 32). 42) is rectangular along the shape of the end portion of the holding member 32 (holding member 42), similar to the shape of the welded portion 34 (welded portion 44) that joins 42), but is not particularly limited to such a shape.

In view of the fact that the device body 10 is elongated and the amount of displacement caused by laser welding is greater toward the ends of the device body 10 in the longitudinal direction, as shown in FIG. A portion 15 may be formed. That is, as shown in FIG. 9A, when viewed in the vertical direction, of the rectangular welded portion 34 (welded portion 44) having four sides, the same position as two sides extending in the lateral direction The laser beam may be irradiated so that the melted portion 15a and the melted portion 15b (the melted portion 15c and the melted portion 15d) are formed only on the sides and the melted portion 15 is not formed at the same position as the two sides extending in the longitudinal direction. . Furthermore, as shown in FIG. 9(b), in order to form the melted portion 15a, the melted portion 15e, and the melted portion 15c, the melted portion 15a and the melted portion 15c are formed so that the melted portion 15e is also formed at the portion between the melted portion 15a and the melted portion 15c. A laser beam may be continuously irradiated. Similarly, as shown in FIG. 9B, a fusion zone 15b, a fusion zone 15f, and a fusion zone 15d are formed so that a fusion zone 15f is also formed in a portion between the fusion zone 15b and the fusion zone 15d. A laser beam may be continuously irradiated as much as possible. In order to form the melted portion 15, the laser beam may be irradiated multiple times at intervals. For example, when the melted portion 15a is formed, the laser head 151 may be repeatedly moved a plurality of times in the same lateral direction, or the laser head 151 may be reciprocated.

<Modified Example of Manufacturing Method of Liquid-cooled Cooling Device 1>
FIGS. 10(a) to 10(d) are diagrams schematically showing modifications of the device main body 10 manufactured by the modification of the manufacturing method of the liquid-cooling type cooling device 1. FIG.
In the manufacturing method of the liquid-cooling type cooling device 1 described above, after the device body 10 and the holding member 32 (holding member 42) are laser-welded, the lower surface of the device body 10 is irradiated with a laser beam to form the melted portion 15. However, it is not particularly limited to such an aspect.
For example, as shown in FIGS. 10(a) to 10(d), first, the lower surface of the apparatus main body 10 is irradiated with a laser beam to form the melted portion 15, and then the apparatus main body 10 and the holding member 32 (holding member 32) are formed. The member 42) may be laser-welded. That is, the deformation of the entire device body 10 due to the laser beam irradiation for joining the device body 10 and the holding member 32 (holding member 42) is predicted, and the laser beam is first irradiated to the lower surface of the device body 10. Alternatively, the fusion zone 15 may be formed in advance. Even in this mode, deformation of the entire device body 10 due to laser beam irradiation for melting the lower wall 14 of the device body 10 and joining the device body 10 and the holding member 32 (holding member 42) The deformation of the entire device main body 10 due to the irradiation of the laser light is canceled out. As a result, even if laser welding is performed to join the apparatus main body 10 and the holding member 32 (holding member 42), the required flatness of the lower surface of the apparatus main body 10 can be easily satisfied.

Note that the melted portion 15 may be formed by irradiating the lower surface of the device main body 10 with a laser beam before or after joining the abutted portions of the device main body 10 and the change member 20. can be

<Second embodiment>
Unlike the liquid-cooled cooling device 1 according to the first embodiment, the liquid-cooled cooling device 2 according to the second embodiment has a melting portion 215 corresponding to the melting portion 15 formed on the lower surface of the device main body 10 . is different from the fusion zone 15 . Differences from the liquid cooling system 1 according to the first embodiment will be described below. Elements having the same functions in the liquid cooling system 1 according to the first embodiment and the liquid cooling system 2 according to the second embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. .

FIG. 11 is a bottom view of the liquid cooling system 2 according to the second embodiment.
In the liquid-cooled cooling device 2 according to the second embodiment, when viewed in a direction (vertical direction) orthogonal to the plate surface (upper surface or lower surface) of the device main body 10, a rectangular weld having four sides A fusion zone 215a, a fusion zone 215b, a fusion zone 215c, and a fusion zone 215d are formed at predetermined intervals on both sides of two sides 34a and 34b of the portion 34 extending in the lateral direction. Further, the welded portions 215e, 215f, 215g, and 215g are placed at predetermined intervals on both sides of the two sides 44a and 44b extending in the transverse direction of the rectangular welded portion 44 having four sides. A fusion zone 215h is formed. In other words, after the device main body 10 and the holding member 32 and the holding member 42 are joined by laser welding, when viewed in the vertical direction, predetermined A laser beam is irradiated to form a melted portion 215a, a melted portion 215b, a melted portion 215c, a melted portion 215d, a melted portion 215e, a melted portion 215f, a melted portion 215g, and a melted portion 215h at spaced positions.

FIGS. 12(a) to 12(d) are diagrams schematically showing deformations of the device main body 10 of the liquid cooling type cooling device 2 according to the second embodiment.
In the liquid-cooled cooling device 2 according to the second embodiment manufactured by the manufacturing method described above, the lower surface of the device body 10 (the lower surface of the lower wall 14) extends in the lateral direction of the welded portion 34. When the melted portions 215a and 215b are formed at predetermined intervals on both sides of the side 34a (see FIG. 12(c)), the upper portion of the device main body 10 at the portion irradiated with the laser beam becomes convex. As shown in FIG. 12(d), the entire device body 10 is deformed. As a result, the deformation of the entire device body 10 caused by the laser beam irradiation for joining the device body 10 and the holding member 32 is reduced by the laser beam irradiation for forming the melted portions 215a and 215b. It is weakened by the deformation of the entire 10.

Similarly, when the melted portion 215c and the melted portion 215d, the melted portion 215e and the melted portion 215f, the melted portion 215g and the melted portion 215h are formed, the upper portion of the apparatus main body 10 at the portion irradiated with the laser beam becomes convex. The entire device main body 10 is deformed so as to be.
From the above, even if laser welding is performed to join the device main body 10 and the holding member 32 and the holding member 42, the lower surface of the device main body 10 can be secured by forming the melted portions 215a to 215h. It becomes easier to satisfy the required flatness.
In addition, the said predetermined space|interval is not specifically limited. FIG. 11 illustrates a case where the predetermined interval is 1/3 of the side of the welded portion 34 extending in the longitudinal direction.
Further, in order to form the melted portion 215, the laser light may be irradiated multiple times at intervals. For example, when forming the fusion zone 215a, the laser head 151 may be repeatedly moved a plurality of times in the same lateral direction, or the laser head 151 may be reciprocated.

(Modified example of the shape of the fusion zone 215)
FIG. 13 is a bottom view of the liquid cooling system 2 according to the second embodiment.
The predetermined interval is set to 1/2 of the side extending in the longitudinal direction of the welded portion 34, and when viewed in the vertical direction, one fusion zone is located between the side 34a and the side 34b extending in the lateral direction of the welded portion 34. 215i may be formed. In such a case, a fusion zone 215j is formed on the opposite side of the side 34b from the side 34a at a half position of the side extending in the longitudinal direction of the welded part 34, and the side 34b It is preferable to form a fusion zone 215k at a half position of the longitudinally extending side of the weld zone 34 on the opposite side of the weld zone 34a. In addition, it is preferable to form a fusion portion 215l, a fusion portion 215m, and a fusion portion 215n for the welded portion 44 as well.

In addition, in the liquid-cooled cooling device 2 according to the second embodiment described above, a melted portion is also formed in a portion between the melted portion 215a and the melted portion 215e, and the melted portion 215a to the melted portion 215e are continuous. As shown, the laser light may be continuously irradiated. Similarly, the laser beam may be continuously irradiated so that the melted portion 215b to the melted portion 215f, the melted portion 215c to the melted portion 215g, and the melted portion 215d to the melted portion 215h are continuous. Similarly, the laser beam may be continuously irradiated so that the melted portion 215i to the melted portion 215l, the melted portion 215j to the melted portion 215m, and the melted portion 215k to the melted portion 215n are continuous.
In addition, in order to form the melted portion 215, the laser beam may be irradiated multiple times at intervals as described above.

<Modified Example of Manufacturing Method of Liquid-cooled Cooling Device 2>
In the above-described liquid-cooled cooling device 2 as well, the device body 10 and the holding member 32 (holding member 42) are laser-welded after the melted portion 215 is formed by irradiating the lower surface of the device body 10 with a laser beam. You can That is, the deformation of the device body 10 caused by the laser beam irradiation for joining the device body 10 and the holding member 32 (holding member 42) is predicted, and the laser beam is first irradiated to the lower surface of the device body 10. The melted portion 215 may be formed in advance. Even in this mode, the device main body 10 and the holding member 32 (holding member 42) are moved in the direction opposite to the deformation of the device main body 10 caused by the laser beam irradiation for melting the lower wall 14 of the device main body 10. Deformation of the device main body 10 occurs due to the laser beam irradiation for joining. As a result, even if laser welding is performed to join the apparatus main body 10 and the holding member 32 (holding member 42), the required flatness of the lower surface of the apparatus main body 10 can be easily satisfied.

As described above, the present invention irradiates a second member, for example the holding member 32, superimposed on the first member, for example, the plate-like apparatus main body 10, so that the first member is irradiated with a laser beam. A liquid-cooling type cooling device comprising: a joining step of joining a member and a second member; and a melting step of melting a surface of the first member opposite to a surface on which the second member is superimposed. 1 is an example of a structure manufacturing method.
Here, in the melting step, the first member may be irradiated with a laser beam.
Further, if the structure is a structure in which the first member and the second member are joined by irradiating the second member superimposed on the plate-like first member with a laser beam, It is not limited to the liquid-cooled cooling device 1 and the liquid-cooled cooling device 2 .

In addition, the bonding step is performed before the melting step, and in the melting step, the surface of the first member to which the second member is bonded in the bonding step opposite to the surface to which the second member is bonded may be melted.
Alternatively, the melting process is performed before the bonding process, and in the bonding process, the fusion zone (eg, fusion zone 15) is formed in the first member in which the fusion zone (eg, fusion zone 15) is formed in the fusion process. A second member may be joined to the surface opposite to the surface on which the second member is formed.

In addition, according to the present invention, by irradiating a laser beam to the abutting portion between a first member such as a plate-like apparatus main body 10 and a second member such as a changing member 20, the first member and The structure manufacturing method includes a joining step of joining a second member and a melting step of melting a side of the butted portion opposite to the side irradiated with laser light in the joining step.

<Modified Example of Cross-Sectional Shape of Fusion Portion>
14(a) and 14(b) are diagrams showing modifications of the cross-sectional shape of the fusion zone.
The structure manufactured using the above-described manufacturing method is not the liquid-cooled cooling device 1 and the liquid-cooled cooling device 2 in which the inflow-side flow path 111 and the like through which the cooling liquid flows are formed, but the structure shown in FIG. ), the first member 501 and the second member 502 are formed by irradiating a second member 502 made of an aluminum material superimposed on a first member 501 made of a solid aluminum material with a laser beam. is a bonded structure 3 . In the case of this structure 3, as shown in FIG. 14(a), a melted portion 503 by laser welding for joining and a first member 501 for canceling or weakening the deformation of the first member 501 due to laser welding. It may have a size that overlaps with the melted portion 504 formed by laser beam irradiation. For example, the bonding process is performed prior to the melting process, and the melted portion 503 by laser beam irradiation for bonding the first member 501 and the second member 502 in the bonding process is processed in the melting process. A melted portion 504 due to laser beam irradiation to the first member 501 may reach. In addition, the melting process is performed before the bonding process, and the first member 501 and the second member 501 are melted in the bonding process by irradiating the first member 501 with laser light in the melting process. A melted portion 503 due to laser beam irradiation for joining the member 502 may reach there. Even in such a case, even if laser welding is performed to join the first member 501 and the second member 502, the surface of the first member 501 on which the second member 502 is overlapped and the The surface on the opposite side of is more likely to satisfy the required flatness. In order to form the melted portion 503 or the melted portion 504, the laser light may be irradiated a plurality of times at intervals.

Further, as shown in FIG. 14(b), a first member 511 made of a solid aluminum material and a second member 512 made of a solid aluminum material are abutted against each other by irradiating the first member 511 with a laser beam. In the case of the structure 4 to which the member 511 and the second member 512 are joined, the melted portion 513 due to laser welding for joining, and the first member 511 and the second member resulting from laser welding It may have a size that overlaps with the melted portion 514 formed by laser beam irradiation for canceling or weakening the deformation of 512 . For example, after joining the first member 511 and the second member 512 (forming the melted portion 513) by irradiating the butted portion of the first member 511 and the second member 512 with a laser beam, , the butted portion of the first member 511 and the second member 512 is irradiated with a laser beam from the side opposite to the side irradiated with the laser beam for joining. You may irradiate so that 513 may be reached. In other words, in the structure 4, the first member 511 and the second member 512 are joined by irradiating the butted portion of the first member 511 and the second member 512 with laser light, and the butted portion is formed. , a melted portion 514 is provided on the surface opposite to the surface on which the melted portion 513 is formed by laser light irradiation. Even in such a case, even if laser welding is performed to join the first member 511 and the second member 512, the surfaces of the first member 511 and the second member 512 are required. Flatness is easily satisfied. Note that after the butted portion of the first member 511 and the second member 512 is irradiated with a laser beam to bond the two, the laser beam is irradiated to the butted portion for bonding. By irradiating the laser beam from the opposite side, both are firmly joined. Further, in order to form the melted portion 513 or the melted portion 514, the laser light may be irradiated multiple times at intervals.

DESCRIPTION OF SYMBOLS 1, 2... Liquid cooling type cooling device, 10... Apparatus main body, 13... Upper wall, 14... Lower wall, 15, 215... Melting part, 20... Change member, 30... Entrance joint, 31... Entrance pipe, 32... Holding Member 34 Welded portion 34m Melted portion 40 Outlet joint 41 Outlet pipe 42 Holding member

Claims (7)

A joining step of joining the first member and the second member by irradiating the second member superimposed on the plate-shaped first member with a laser beam;
a melting step of melting the surface of the first member opposite to the surface on which the second member is superimposed;
has
performing the melting step prior to the bonding step,
In the bonding step, the second member is bonded to a surface of the first member on which the melted portion is formed in the melting step, opposite to the surface on which the melted portion is formed. 2. The manufacturing method according to claim 1, wherein in the melting step, the first member is irradiated with a laser beam. 3. The manufacturing method according to claim 2, wherein in the melting step, the laser beam is applied to the same position as the irradiation position in the bonding step when viewed in a direction orthogonal to the plate surface of the first member. A joining step of joining the first member and the second member by irradiating the second member superimposed on the plate-shaped first member with a laser beam;
a melting step of melting the surface of the first member opposite to the surface on which the second member is superimposed;
has
In the melting step, when viewed in a direction orthogonal to the plate surface of the first member, at a position different from the irradiation position in the bonding step, on both sides in the longitudinal direction centering on the irradiation position and irradiating the first member with the laser beam at positions spaced apart from each other by a predetermined distance. performing the bonding step prior to the melting step;
5. The method according to claim 4, wherein in the melting step, the surface of the first member to which the second member is bonded in the bonding step, which is opposite to the surface to which the second member is bonded, is melted. manufacturing method. A joining step of joining the first member and the second member by irradiating the butted portion of the plate-shaped first member made of aluminum material and the second member made of aluminum material with laser light. and,
a melting step of melting the side of the butted portion opposite to the side irradiated with the laser beam in the bonding step;
has
In the manufacturing method, in the melting step, the butted portion is irradiated with a laser beam from a side opposite to the side irradiated with the laser beam in the joining step. A structure in which the first member and the second member are joined by irradiating the second member superimposed on the plate-shaped first member with a laser beam,
The first member has a fusion zone on the surface opposite to the surface on which the second member is superimposed,
The fusion zone is at a position different from the irradiation position for joining the first member and the second member when viewed in a direction orthogonal to the plate surface of the first member, Structures formed at predetermined intervals on both sides in the longitudinal direction centering on the irradiation position.