Green welding process for water cooling box

Abstract

The invention discloses a green welding process for a water-cooling box, and particularly relates to the field of water-cooling box machining, the water-cooling box comprises a water-cooling box shell and a water-cooling box cover plate, the water-cooling box shell comprises a water-cooling box shell main body, a plurality of pin fins are uniformly distributed in the water-cooling box shell main body, and a shell friction stir welding zone is arranged around the outer sides of the pin fins; the welding method comprises the specific welding steps that diffusion welding is conducted on the contact bottom faces of the pin fins and the water-cooling box cover plate, and friction stir welding is conducted on the contact bottom faces / side walls of the assembled water-cooling box shell and the water-cooling box cover plate. According to the process, the overall sealing performance and the strength of the water-cooling box are remarkably improved, and the risks of equipment failure or damage caused by medium leakage due to water pressure bulge and long-term use are thoroughly solved.

Description

Technical Field

[0001] The present invention relates to the technical field of water cooling box processing, and more specifically, to a green welding process for a water cooling box. Background Art

[0002] A water-cooling box is an efficient heat dissipation device, which is usually used for heat dissipation of high-performance electronic components, such as motor drive of new energy vehicles, LED technology and renewable energy applications. In the one-piece aluminum pin-type water-cooling box with patent application number 201210222176.2, the structural composition of the water-cooling box is disclosed, which includes a base, a plurality of heat dissipation columns and a sealing cover plate. The base is a rectangular parallelepiped, and a receiving cavity is concavely provided on the base. The heat dissipation column is arranged in the receiving cavity of the base and is connected to the base as a whole, and is formed in one piece by a forging process. The sealing cover plate covers the base and is located on one side of the opening of the receiving cavity. An annular groove is provided on the periphery of the receiving cavity on the base, and a corresponding sealing ring is provided in the annular groove. The sealing cover plate and the one-piece aluminum pin-type water-cooling box are sealed by the sealing ring. There is a gap between the heat dissipation column and the sealing cover plate of the above structure, the structural strength is low, and there is a technical problem of bulging when the water pressure is applied, which affects the assembly accuracy and use of electronic components. The existing technology uses sealing rings, which have problems such as easy aging, easy deformation, limited applicability, low-temperature brittleness, and poor radiation resistance. Long-term use will cause the sealing ring to harden and become brittle, thereby losing its original elasticity and sealing performance, and cannot effectively prevent medium leakage, which may cause equipment failure or damage. Summary of the invention

[0003] In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides a green welding process for a water-cooling box, which improves the sealing performance of the water-cooling box and enhances the strength of the water-cooling box.

[0004] To achieve the above-mentioned object, the present invention provides the following technical solutions: a green welding process for a water-cooled box, comprising a water-cooled box shell and a water-cooled box cover plate, wherein the water-cooled box shell comprises a water-cooled box shell body, wherein a plurality of pin fins integrally formed with the water-cooled box shell body are evenly arranged in the water-cooled box shell body, and a shell stir friction welding zone is arranged around the outer side of the pin fins; The water-cooling box cover plate comprises a water-cooling cover plate body, a diffusion welding zone is provided on the water-cooling cover plate body, and a cover plate friction stir welding zone is provided around the outer side of the diffusion welding zone; The specific welding steps are as follows: S1: performing diffusion welding on the contact area between the pin fin and the water cooling box cover body; the contact area is a diffusion welding zone; S2: Friction stir welding is performed on the friction stir welding zone of the shell and the friction stir welding zone of the cover plate.

[0005] In a preferred embodiment, the specific diffusion welding steps in step S1 are as follows: S1.1: The equipment uses a hydraulic press, an insulating plate is installed in the hydraulic direction of the hydraulic press, a heating resistor is arranged inside the insulating plate, and graphite is placed under the heating resistor; S1.2: Place a water cooling box to be welded under the graphite; S1.3: Run the hydraulic press to apply pressure to the water cooling box to make the graphite tightly bonded with the water cooling box cover plate and pin fins; wherein the heat transfer sequence is set as: heating resistor → graphite → water cooling box cover plate → pin fins; S1.4: The pin-fins in the water-cooling box shell and the diffusion welding zone at the end of the water-cooling box cover plate will be heated and diffused and combined to achieve the connection between the water-cooling box cover plate and the pin-fins in the water-cooling box shell.

[0006] In a preferred embodiment, the specific friction stir welding steps in step S2 are as follows: The specific friction stir welding steps in step S2 are as follows: S2.1: After the water-cooling box shell and the water-cooling box cover plate connected in step S1.4 are fixed as a whole, a stirring tool equipped with a shaft shoulder and a needle protrusion is inserted into the friction stir welding zone of the shell and the friction stir welding zone of the cover plate in a high-speed rotating state; S2.2: The frictional shear resistance between the stirring tool's stirring head and the material to be welded generates frictional heat, which softens the material and causes plastic deformation, and releases plastic deformation energy. When the stirring head is driven to move forward along the interface to be welded, the hot plasticized material is transferred from the front to the rear of the stirring head, and under the forging action of the stirring head shoulder, a solid phase connection is achieved between the water-cooling box shell and the water-cooling box cover.

[0007] In a preferred embodiment, when welding is finished: the mechanical pressure is released, and the water cooling box is removed by a robot arm and cooled naturally.

[0008] In a preferred embodiment, in step S2.2, the welding width is set to 4-15 mm, and the welding depth is set to 4-15 mm.

[0009] In a preferred embodiment, when the welding in step S2.2 is completed: the stirring head rotates to remove the parts, and takes out the product formed by consolidation of the water-cooling box shell and the water-cooling box cover.

[0010] In a preferred embodiment, the diffusion welding in step S1.3 causes the atoms between the materials to diffuse and move with each other through high temperature heating, thereby forming a tight bonding area between the pin fins and the bottom of the water cooling box cover; In a preferred embodiment, water inlets / outlets are provided on both sides of the diffusion welding zone, and the water inlets / outlets include a water inlet and a water outlet.

[0011] Technical effects and advantages of the present invention: The process of the present invention significantly improves the overall sealing performance and strength of the water cooling box, and completely solves the risk of water pressure bulging and medium leakage after long-term use, causing equipment failure or damage.

[0012] The process of the present invention is applicable to copper, aluminum and other materials suitable for diffusion welding and stir friction welding; the present invention selects diffusion welding and stir friction welding in different areas of the product, wherein diffusion welding achieves the purpose of material welding by heating at high temperature to make the atoms between materials diffuse and move with each other, without the need to melt the solder, thus avoiding defects that may occur during the welding process, such as pores and cracks, and ensuring that the pin fins are tightly combined with the bottom of the cover plate, and completely solving the technical problem that the pin fins cannot be completely welded to the bottom of the cover plate and there is a gap. The welded joint usually has a strength equivalent to that of the parent material, and the product strength is high. After that, stir friction welding is used to ensure that the water cooling box is well sealed, and the strength of the welding area can reach 80-90% of the parent material; no solder is required in the process, and no solder flux will remain after welding, which is green and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The water cooling box structure of the present invention is shown in FIG. Figure 1 ; Figure 2 The water cooling box structure of the present invention is shown in FIG. Figure 2 ; Figure 3 The water cooling box structure of the present invention is shown in FIG. Figure 3 ; Figure 4 The water cooling box structure of the present invention is shown in FIG. Figure 4 ; Figure 5 It is a schematic diagram of the diffusion welding process; Figure 6 for Figure 3 AA section view in the schematic diagram; Figure 7 for Figure 6 A partial enlarged view of point B in the middle; The reference numerals are: 1 water cooling box housing, 2 water cooling box cover plate; 3 diffusion bonding layer; 11 water-cooling box shell body, 12 pin fins, 13 shell friction stir welding zone; 21 water-cooled cover plate body, 22 diffusion welding zone, 23 water inlet / outlet, 24 cover plate friction stir welding zone. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] The present invention provides Figure 1-7 A green welding process for a water-cooled box is shown, comprising a water-cooled box shell 1 and a water-cooled box cover plate 2, wherein the water-cooled box shell 1 comprises a water-cooled box shell body 11, wherein a plurality of pin fins 12 are evenly arranged in the water-cooled box shell body 11, and a shell stir friction welding zone 13 is arranged around the outer side of the pin fins 12; Diffusion welding in the present invention does not require the use of solder like brazing, thus avoiding the problem of residual solder flux in the water channel; in addition, diffusion welding can solve the problem that only stir friction welding will produce pin fins that cannot be welded to the bottom of the water cooling box cover, resulting in gaps and low structural strength.

[0016] The water-cooling box cover plate 2 comprises a water-cooling cover plate body 21, a diffusion welding zone 22 is provided at one end of the water-cooling cover plate body 21, a cover plate friction stir welding zone 24 is provided around the outside of the diffusion welding zone 22, and water inlets / outlets 23 are provided on both sides of the diffusion welding zone 22, and the water inlet / outlet 23 comprises a water inlet and a water outlet; S1: Diffusion welding is performed on the diffusion welding zone 22 where the pin fin contacts the cover plate body.

[0017] The specific process steps of diffusion welding are as follows: first, install the insulating plate, wherein there is one insulating plate on the top and one on the bottom, place the heating resistor inside the insulating plate, the heating resistor is placed in the contact surface with the graphite, and then place the graphite in the middle of the insulating plate (one on the top and one on the bottom); as shown in the attached figure Figure 5 shown.

[0018] The water-cooling box housing 1 and the water-cooling box cover plate 2 to be welded are placed in the middle of the graphite, wherein the water-cooling box cover plate 2 is arranged above the water-cooling box housing 1; The heating resistor in the graphite is located directly above the water-cooled box cover plate 2. Under the force of the hydraulic press equipment, the insulating plate is driven downward to apply pressure, so that the graphite is combined with the water-cooled box cover plate 2; the water-cooled box shell 1 and the water-cooled box cover plate 2 are tightly combined; after the heating resistor is energized, the heat is transferred to the graphite and then reaches the diffusion welding zone 22 of the water-cooled box cover plate 2; the heat transfer sequence is set as: heating resistor → graphite → water-cooled box cover plate → pin fin; the pin fin 12 corresponding to the water-cooled box shell 1 and the contact surface of the water-cooled box shell cover plate 2 diffuse and move together under the action of pressure and high temperature, thereby realizing the close combination of the pin fin 12 and the water-cooled box shell body 11, and obtaining a diffusion bonding layer 3, as shown in the attached Figure 7As shown; the solution of the present invention does not require melting of solder, thus avoiding defects that may occur during the welding process, such as pores and cracks.

[0019] At the end of welding: release the mechanical pressure (applied by the hydraulic press), remove the initially connected water cooling box with a robotic arm and allow it to cool naturally.

[0020] S2: performing friction stir welding on the friction stir welding area of ​​the assembly surface of the water cooling box shell 1 and the water cooling box cover plate 2; The specific steps are as follows: put the water-cooling box preliminarily connected by S1 into the fixed tooling, and then insert the stirring tool with the shoulder and the needle convex into the welding area to be welded by high-speed rotation. The friction shear resistance between the stirring head and the material to be welded generates friction heat, which softens the material and causes plastic deformation, and releases plastic deformation energy. When the stirring head is driven to move forward along the interface to be welded, the hot plasticized material is transferred from the front to the rear of the stirring head, and under the forging action of the stirring head shoulder, the solid phase connection between the water-cooling box cover plate 2 and the water-cooling box shell is achieved (welding width 4-15mm, depth 4-15mm); At the end of welding: the stirring head rotates to remove the parts, and the product formed by consolidation of the water-cooling box shell 1 and the water-cooling box cover 2 is taken out.

[0021] In summary, the present invention solves the problem that the pin fins cannot be connected to the bottom of the water cooling box cover plate, and there are gaps and low structural strength by developing a new water cooling box welding method using diffusion welding + stir friction welding; combined with stir friction welding, the water cooling box can be ensured to have good sealing, and the strength of the welding area can reach 80-90% of the parent material, and the product has high structural strength.

[0022] The diffusion welding and stir friction welding of the present invention do not require the use of solder, thus avoiding the problem of residual solder flux in the water channel; and do not require melting the solder, thus avoiding defects that may occur during the welding process, such as pores and cracks, thereby achieving a better welding effect on the water cooling box.

[0023] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change; Secondly: In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other; Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A green welding process for a water-cooled box, characterized in that: The water-cooling box comprises a water-cooling box shell (1) and a water-cooling box cover plate (2), wherein the water-cooling box shell (1) comprises a water-cooling box shell body (11), a plurality of pin fins (12) formed integrally with the water-cooling box shell body (11) are evenly arranged in the water-cooling box shell body (11), and a shell friction stir welding zone (13) is provided around the outer side of the pin fins (12); The water-cooling box cover plate (2) comprises a water-cooling cover plate body (21), a diffusion welding zone (22) being provided on the water-cooling cover plate body (21), and a cover plate friction stir welding zone (24) being provided around the outside of the diffusion welding zone (22); The specific welding steps are as follows: S1: performing diffusion welding on the contact area between the pin fin (12) and the water cooling box cover plate body (21); the contact area is the diffusion welding zone (22); S2: Stir friction welding is performed on the shell friction stir welding zone (13) and the cover plate friction stir welding zone (24).

2. A water-cooling box green welding process according to claim 1, characterized in that: The specific diffusion welding steps in step S1 are as follows: S1.1: The equipment uses a hydraulic press, an insulating plate is installed in the hydraulic direction of the hydraulic press, a heating resistor is arranged inside the insulating plate, and graphite is placed under the heating resistor; S1.2: Place a water cooling box to be welded under the graphite; S1.3: Run the hydraulic press to apply pressure to the water cooling box to make the graphite tightly bonded to the water cooling box cover plate and the pin fin (12); the heat transfer sequence is set as: heating resistor → graphite → water cooling box cover plate → pin fin; S1.4: The pin fins (12) in the water-cooling box shell (1) and the diffusion welding zone (22) at the end of the water-cooling box cover plate (2) are heated and molecularly diffused and bonded, thereby achieving connection between the water-cooling box cover plate (2) and the pin fins (12) in the water-cooling box shell (1).

3. A water-cooling box green welding process according to claim 2, characterized in that: The specific friction stir welding steps in step S2 are as follows: S2.1: After the water-cooling box shell and the water-cooling box cover plate connected in step S1.4 are fixed as a whole, a stirring tool equipped with a shaft shoulder and a needle protrusion is inserted into the friction stir welding zone of the shell and the friction stir welding zone of the cover plate in a high-speed rotating state; S2.2: The frictional shear resistance between the stirring tool's stirring head and the material to be welded generates frictional heat, which softens the material and causes plastic deformation, and releases plastic deformation energy. When the stirring head is driven to move forward along the interface to be welded, the hot plasticized material is transferred from the front to the rear of the stirring head, and under the forging action of the stirring head shoulder, a solid phase connection is achieved between the water-cooling box shell and the water-cooling box cover.

4. A water-cooling box green welding process according to claim 3, characterized in that: At the end of welding: release the mechanical pressure, remove the water cooling box with the robot arm and allow it to cool naturally.

5. A water-cooling box green welding process according to claim 4, characterized in that: In step S2.2, the welding width is set to 4-15 mm, and the welding depth is set to 4-15 mm.

6. A water-cooling box green welding process according to claim 3, characterized in that: When the welding in step S2.2 is completed: the stirring head rotates to remove the parts, and the product formed by the consolidation of the water cooling box shell (1) and the water cooling box cover (2) is taken out.

7. A water-cooling box green welding process according to claim 4, characterized in that: In step S1.3, the diffusion welding causes the atoms between the materials to diffuse and move with each other through high-temperature heating, thereby promoting the formation of a tightly bonded area between the pin fins (12) and the bottom of the water-cooling box cover (2).

8. The green welding process for a water-cooled box according to claim 1 is characterized in that: Water inlets / outlets (23) are provided on both sides of the diffusion welding zone (22), and the water inlets / outlets (23) comprise a water inlet and a water outlet.

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