A heat sink joint and method of processing the same

Abstract

The present application relates to the technical field of heat dissipation plate joint, in particular to a heat dissipation plate joint and a processing method thereof, which comprises the following steps: pipe material selection, external circle turning, inner hole CNC milling, first end cold compression pre-necking, filter screen body positioning and second end cold compression final necking, and has the advantages of simple operation, convenient control, high production efficiency, low production cost, large-scale production, effective filtration of impurities in the cooling liquid during use through the built-in filter screen body, prevention of flow channel blockage, improved heat dissipation performance and reliability of the liquid cooling heat dissipation plate, guaranteed sealing and strength of the joint through the cold compression necking process, no need for additional installation of independent filters outside the joint, lower pressure drop and avoidance of high flow resistance caused by the installation of independent filters. In addition, the cold compression necking process does not have the process of high-temperature welding of the filter screen, and the problems of filter screen deformation and deviation of filtering precision caused by high temperature are avoided.

Description

Technical Field

[0001] This invention relates to the field of heat sink connector technology, and specifically to a heat sink connector and its processing method. Background Technology

[0002] Liquid-cooled heat sinks are devices that achieve efficient heat dissipation through liquid circulation, and are widely used in high-power electronic equipment, new energy vehicles, data centers, and other fields. Traditional liquid-cooled heat sinks mainly consist of three parts: a tubular substrate, flow channels, and inlet / outlet ports. The tubular substrate is typically made of high thermal conductivity materials such as copper or aluminum, and its surface is in direct contact with the heat-generating elements. The flow channels are grooves machined inside the tubular substrate for the flow of coolant. The inlet / outlet ports are located on the side of the tubular substrate and serve as interfaces for connecting to an external circulation system, ensuring the circulation of coolant.

[0003] Most existing liquid cooling heat sinks have inlet and outlet connectors that are directly machined into a single unit using CNC machining. The interior of these connectors is a smooth, unobstructed fluid channel, which cannot filter impurities in the coolant. During long-term operation of the liquid cooling system, metal debris precipitated from the inner walls of the pipes, colloidal impurities in the coolant, and residual welding slag and chips from the installation process can enter the microchannels inside the liquid cooling heat sink with the fluid, easily causing blockages. This leads to a sharp drop in localized heat exchange efficiency, an increase in thermal resistance, and ultimately, overheating failure of high-power devices. Adding an external independent filter to the connector not only increases the system size and number of pipe connections but also introduces additional fluid pressure drops, disrupting the original flow distribution balance of the liquid cooling circuit. Summary of the Invention

[0004] To overcome the shortcomings and deficiencies of the existing technology, the present invention aims to provide a processing method for a heat sink connector. This method is simple to operate, easy to control, has high production efficiency, low production cost, and can be used for large-scale production. Furthermore, the built-in filter body can effectively filter impurities in the coolant during use, avoiding flow channel blockage and improving the heat dissipation performance and reliability of the liquid-cooled heat sink. The cold compression port process ensures the sealing and strength of the connector, eliminating the need for an additional independent filter on the outside of the connector, resulting in lower pressure drop and avoiding the high flow resistance caused by adding an independent filter.

[0005] Another object of the present invention is to provide a heat sink connector.

[0006] The objective of this invention is achieved through the following technical solution: a method for processing a heat sink connector, comprising the following steps: (1) Pipe selection: Metal heat dissipation pipes are used as joint blanks; (2) External turning: The outer surface of the joint blank is precision machined using a CNC lathe; (3) CNC milling of inner hole: The turned pipe is clamped in the tooling fixture of the machining center, and the inner hole is milled through using a carbide end mill; (4) First end cold compression pre-shrinking: Insert one end of the milled pipe into the positioning mold cavity of the hydraulic compression machine. The cone angle of the mold cavity is set to 10°-25°. Perform radial cold extrusion compression on the first end of the pipe at room temperature to reduce the inner diameter of one end of the pipe by 5%-20%. (5) Filter body installation and positioning: Take the filter body and push it into the inner hole of the pipe from the other end of the pipe that has not been constricted, and make the end face of the filter body close to the inner step formed by the first end constriction; (6) Second end cold compression final shrinkage: The other end of the tube installed into the filter body is installed into the positioning mold cavity of the hydraulic compression machine. The cone angle of the mold cavity is kept at 10°-25°. The second end of the tube is radially cold extruded and compressed at room temperature, reducing the inner diameter of the other end of the tube by 5%-20%. Finally, the inner step formed by the shrinkage at both ends limits the filter body and obtains the heat dissipation plate joint.

[0007] Preferably, the filter body is a rigid filter plate, and the filter body has a plurality of filter through holes that are evenly spaced apart.

[0008] Preferably, the metal heat dissipation pipe is made of copper or aluminum; the filter body is made of stainless steel.

[0009] Preferably, in step (2), the spindle speed of the CNC lathe is 1800 r / min, the feed rate is 0.12 mm / r, and the surface roughness Ra of the outer circle after turning is ≤1.6 μm; in step (3), the spindle speed of the machining center is 6500 r / min, the feed rate is 80 mm / min, and the surface roughness Ra of the inner hole is ≤3.2 μm.

[0010] Preferably, in step (4), the axial extrusion force of the hydraulic compression machine is 12-15kN; in step (6), the axial extrusion force of the hydraulic compression machine is 12-15kN.

[0011] Preferably, in step (5), the filter body and the inner hole are fitted with a gap, and the gap is controlled between 0.01mm and 0.05mm.

[0012] Preferably, the processing method of the heat sink connector further includes the following steps: (7) quick interface groove and external thread processing: a first quick interface groove is formed by CNC machining on the outer wall of the first end of the pipe, and an external thread is formed by CNC machining on the outer wall of the second end of the pipe. The structural design of the first quick interface groove and the external thread makes the connection between the heat sink connector and the heat sink and the liquid cooling pipe more convenient and improves the installation efficiency.

[0013] Preferably, the processing method of the heat sink connector further includes the following steps: (8) forming a second quick interface groove by CNC machining on the outer wall of the second end of the pipe.

[0014] Another objective of the present invention is achieved by the following technical solution: a heat sink connector, which is manufactured by the heat sink connector manufacturing method described above, and the heat sink connector is used to connect to the liquid inlet / outlet of a liquid-cooled heat sink.

[0015] The beneficial effects of this invention are as follows: The processing method of the heat sink connector of this invention is simple to operate, easy to control, has high production efficiency, and low production cost, making it suitable for large-scale production. Furthermore, the built-in filter body effectively filters coolant impurities during use, preventing flow channel blockage and improving the heat dissipation performance and reliability of the liquid-cooled heat sink. The cold compression port process ensures the sealing and strength of the connector, eliminating the need for an external independent filter, resulting in lower pressure drop and avoiding the high flow resistance associated with an external filter. In addition, the cold compression port process eliminates the high-temperature welding of the filter screen, avoiding filter deformation and filtration accuracy deviation caused by high temperatures.

[0016] The heat sink connector of the present invention uses a cold compression port process to confine and house the filter body inside the pipe, preventing the filter body from detaching; by using the built-in filter body, it can effectively filter impurities in the coolant, improve the heat dissipation performance and reliability of the liquid cooling heat sink, and prevent impurities from entering the flow channel of the liquid cooling heat sink and causing flow channel blockage. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is an exploded view of the present invention; Figure 3 This is a structural schematic diagram from another perspective of the present invention; Figure 4 yes Figure 3 A schematic diagram of the cross section of AA.

[0018] The attached diagram is labeled as follows: 1. Filter body; 2. Tube; 3. Filter through hole; 4. First quick-connect groove; 5. External thread; 6. Second quick-connect groove. Detailed Implementation

[0019] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present invention.

[0020] like Figure 1-4 As shown, a method for processing a heat sink connector includes the following steps: (1) Selection of pipe material 2: Take metal heat dissipation pipe material 2 as the joint blank; (2) External turning: The outer surface of the joint blank is precision machined using a CNC lathe; (3) CNC milling of inner hole: The machined pipe 2 is clamped in the tooling fixture of the machining center and the inner hole is milled through using a carbide end mill; (4) First end cold compression pre-shrinking: Insert one end of the milled pipe 2 into the positioning mold cavity of the hydraulic compression machine. The cone angle of the mold cavity is set to 10°-25°. At room temperature, perform radial cold extrusion compression on the first end of the pipe 2 to reduce the inner diameter of one end of the pipe 2 by 5%-20%. (5) Insertion and positioning of filter body 1: Take filter body 1 and push it into the inner hole of tube 2 from the other end of tube 2 that is not constricted, and make the end face of filter body 1 close to the inner step formed by the first end constriction. (6) Second end cold compression final shrinkage: The other end of the tube 2 installed in the filter body 1 is installed into the positioning mold cavity of the hydraulic compression machine. The cone angle of the mold cavity is kept at 10°-25°. The second end of the tube 2 is radially cold extruded and compressed at room temperature, reducing the inner diameter of the other end of the tube 2 by 5%-20%. Finally, the inner step formed by the shrinkage at both ends limits the filter body 1, and the heat dissipation plate joint is obtained.

[0021] The processing method of this heat sink connector, through the built-in filter body 1, effectively filters coolant impurities during use, preventing flow channel blockage and improving the heat dissipation performance and reliability of the liquid-cooled heat sink. The cold compression port process ensures the sealing and strength of the connector, eliminating the need for an additional external filter, resulting in lower pressure drop and avoiding the high flow resistance caused by adding an external filter. In addition, the cold compression port process eliminates the high-temperature welding process for the filter, avoiding filter deformation and filtration accuracy deviation caused by high temperatures.

[0022] In step (1), metal heat dissipation pipe 2 is selected as the joint blank. The good thermal conductivity, strength and corrosion resistance of metal heat dissipation pipe 2 are used to ensure that the joint can effectively conduct heat when connected to the liquid cooling heat dissipation system, while ensuring its own structural stability and adapting to the working environment of the liquid cooling system. In step (2), the outer surface of the joint blank is precision machined by CNC lathe. The outer diameter and surface roughness of the joint can be accurately controlled, so that the joint has better fit and sealing when connected to external parts, reducing the risk of coolant leakage. It can be combined with the inner hole CNC milling and other steps to ensure the overall dimensional accuracy and shape accuracy of the joint, providing a guarantee for the subsequent installation of the filter screen and the normal use of the joint. In step (3), the inner hole is milled by carbide end mill. The inner hole shape and size that meet the design requirements can be processed, reducing the surface roughness of the inner hole, providing a suitable space for the installation of the filter screen, and ensuring the smooth flow of coolant in the inner hole of the joint. In step (4), the inner diameter of one end of pipe 2 is reduced by 5%. 20%, forming an inner step, providing a structural basis for the initial positioning of the filter screen. The radial cold extrusion compression process at room temperature avoids the influence of high temperature on the performance of the pipe 2, maintains the strength and toughness of the pipe 2, and cooperates with the final cold compression at the second end in step (6) to further limit the filter screen body 1, so that the inner step formed by the two ends of the compression limits the filter screen body 1 in the pipe 2, preventing the filter screen from coming out during use, while avoiding the problems of filter screen deformation and filtration accuracy deviation caused by high temperature, ensuring the filtration performance of the filter screen and the sealing of the joint, and can make the outer diameter of the filter screen body 1 larger than the inner diameter of the first end of the pipe 2 / the inner diameter of the second end of the pipe 2, increasing the effective filtration area and reducing the pressure drop, and also helps to prevent the filter screen body 1 from coming off the pipe 2; In step (5), the filter screen body 1 is pushed into the inner hole of the pipe 2 from the un-compression end of the pipe 2, and its end face is close to the inner step formed by the first end compression, which can effectively intercept impurities in the coolant and prevent impurities from entering the flow channel of the liquid cooling heat sink and causing blockage.

[0023] Furthermore, the filter body 1 is a rigid filter plate to prevent the filter body 1 from easily deforming. The filter body 1 has multiple evenly spaced filter holes 3, which can effectively intercept impurities in the coolant and prevent impurities from entering the flow channel of the liquid cooling heat sink and causing blockage.

[0024] Furthermore, the metal heat dissipation pipe 2 is made of copper or aluminum, utilizing the good thermal conductivity, strength, and corrosion resistance of copper and aluminum to ensure that the joint can effectively conduct heat when connected to the liquid cooling system, while ensuring its own structural stability and adapting to the working environment of the liquid cooling system; the filter body 1 is made of stainless steel.

[0025] Furthermore, in step (2), the spindle speed of the CNC lathe is 1800 r / min, the feed rate is 0.12 mm / r, and the surface roughness Ra of the outer circle after turning is ≤1.6 μm, so that the joint has better fit and sealing when connected with external parts, reducing the risk of coolant leakage; in step (3), the spindle speed of the machining center is 6500 r / min, the feed rate is 80 mm / min, and the surface roughness Ra of the inner hole is ≤3.2 μm, providing suitable space for the installation of the filter body 1, while ensuring the smooth flow of coolant in the inner hole of the joint.

[0026] Furthermore, in step (4), the axial extrusion force of the hydraulic compression machine is 12-15kN; in step (6), the axial extrusion force of the hydraulic compression machine is 12-15kN, and the cone angle of the mold cavity is set to 10°-25°, which ensures the quality and accuracy of the compression.

[0027] Furthermore, in step (5), the filter body 1 and the inner hole are fitted with a clearance, with the clearance controlled at 0.01mm-0.05mm, which facilitates the installation of the filter and ensures the stability of the filter inside the tube.

[0028] Furthermore, the processing method of the heat sink connector also includes the following steps: (7) Processing of quick interface groove and external thread 5: A first quick interface groove 4 is formed by CNC machining on the outer wall of the first end of the pipe 2, and an external thread 5 is formed by CNC machining on the outer wall of the second end of the pipe 2. The structural design of the first quick interface groove 4 and the external thread 5 makes the connection between the heat sink connector and the heat sink and the liquid cooling pipe more convenient, improves the installation efficiency, facilitates the quick assembly of the heat sink connector onto the liquid cooling heat sink, and facilitates the maintenance of the heat sink connector; when it is necessary to clean the impurities intercepted by the filter body 1, the heat sink connector can be removed from the liquid cooling heat sink and the heat sink connector can be rinsed by reverse injection of rinsing liquid.

[0029] Furthermore, the processing method of the heat sink connector also includes the following steps: (8) CNC machining a second quick interface groove 6 on the outer wall of the second end of the pipe 2.

[0030] A heat sink connector is manufactured using the heat sink connector processing method described above. The heat sink connector is used to connect to the inlet / outlet of a liquid-cooled heat sink. The filter body 1 is contained within the tube 2 using a cold compression process to prevent the filter body 1 from detaching. By incorporating the filter body 1, impurities in the coolant can be effectively filtered, improving the heat dissipation performance and reliability of the liquid-cooled heat sink and preventing impurities from entering the flow channel of the liquid-cooled heat sink and causing flow channel blockage.

[0031] The above embodiments are preferred implementations of the present invention. In addition, the present invention can be implemented in other ways. Any obvious substitutions without departing from the concept of the present invention are within the protection scope of the present invention.

Claims

1. A method for processing a heat sink connector, characterized in that, Includes the following steps: (1) Pipe selection: Metal heat dissipation pipes are used as joint blanks; (2) External turning: The outer surface of the joint blank is precision machined using a CNC lathe; (3) CNC milling of inner hole: The turned pipe is clamped in the tooling fixture of the machining center, and the inner hole is milled through using a carbide end mill; (4) First end cold compression pre-shrinking: Insert one end of the milled pipe into the positioning mold cavity of the hydraulic compression machine. The cone angle of the mold cavity is set to 10°-25°. Perform radial cold extrusion compression on the first end of the pipe at room temperature to reduce the inner diameter of one end of the pipe by 5%-20%. (5) Filter body installation and positioning: Take the filter body and push it into the inner hole of the pipe from the other end of the pipe that has not been constricted, and make the end face of the filter body close to the inner step formed by the first end constriction; (6) Second end cold compression final shrinkage: The other end of the tube installed into the filter body is installed into the positioning mold cavity of the hydraulic compression machine. The cone angle of the mold cavity is kept at 10°-25°. The second end of the tube is radially cold extruded and compressed at room temperature, reducing the inner diameter of the other end of the tube by 5%-20%. Finally, the inner step formed by the shrinkage at both ends limits the filter body and obtains the heat dissipation plate joint.

2. The processing method of a heat sink connector according to claim 1, characterized in that: The filter body is a rigid filter plate, and the filter body has multiple evenly spaced filter holes.

3. The processing method of a heat sink connector according to claim 1, characterized in that: The metal heat dissipation pipe is made of copper or aluminum; the filter body is made of stainless steel.

4. The processing method of a heat sink connector according to claim 1, characterized in that: In step (2), the spindle speed of the CNC lathe is 1800 r / min, the feed rate is 0.12 mm / r, and the surface roughness Ra of the outer circle after turning is ≤1.6 μm; in step (3), the spindle speed of the machining center is 6500 r / min, the feed rate is 80 mm / min, and the surface roughness Ra of the inner hole is ≤3.2 μm.

5. The processing method of a heat sink connector according to claim 1, characterized in that: In step (4), the axial extrusion force of the hydraulic compression machine is 12-15kN; in step (6), the axial extrusion force of the hydraulic compression machine is 12-15kN.

6. The processing method of a heat sink connector according to claim 1, characterized in that: In step (5), the filter body and the inner hole are fitted with a clearance, and the clearance is controlled between 0.01mm and 0.05mm.

7. The processing method of a heat sink connector according to claim 1, characterized in that: The processing method of the heat sink connector also includes the following steps: (7) Quick interface groove and external thread processing: a first quick interface groove is formed by CNC machining on the outer wall of the first end of the pipe, and an external thread is formed by CNC machining on the outer wall of the second end of the pipe.

8. The processing method of a heat sink connector according to claim 1, characterized in that: The processing method of the heat sink connector also includes the following steps: (8) CNC machining a second quick interface groove on the outer wall of the second end of the pipe.

9. A heat sink connector, characterized in that: The heat sink connector is manufactured using the processing method described in any one of claims 1-8, and the heat sink connector is used to connect to the liquid inlet / outlet of the liquid-cooled heat sink.

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