Preparation process for aluminum-copper integrated die-cast composite heat sink for laser chip, and heat sink

Abstract

A preparation process for an aluminum-copper integrated die-cast composite heat sink for a laser chip, and a heat sink. In the process, when the structure of a copper heat dissipation assembly is completely prepared, the copper heat dissipation assembly is stably arranged in a counter-gravity die-casting mold for die-casting with an aluminum material to form a copper-aluminum composite, and the copper-aluminum composite is subjected to T4+T6 heat treatment to prepare a composite blank.

Description

Preparation process of aluminum-copper integrated die-casting composite heat sink for laser chip and heat sink

[0001] Cross-reference to Related Applications

[0002] This application claims priority to the Chinese patent application No. 2024108813047, filed on July 03, 2024, and entitled "Preparation process of aluminum-copper integrated die-casting composite heat sink for laser chip and heat sink", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present application belongs to the technical field of semiconductor chip preparation, and specifically relates to a preparation process of aluminum-copper integrated die-casting composite heat sink for laser chip and a heat sink. BACKGROUND

[0004] A laser chip is a semiconductor chip device configured to generate a laser beam, which is the core component of a laser diode. It is a special chip that generates a coherent light beam by exciting atoms or molecules in a semiconductor material.

[0005] The working principle of a laser chip is based on stimulated emission, in which a laser diode injects electrons and positive electrons into a semiconductor material, causing the electrons to transition to a low-energy state, and then generates a laser through stimulated emission. This laser beam is usually monochromatic, coherent, has high energy and narrow spectral width. Laser chips have a wide range of applications, including: optical communication (configured as laser transmitters and receivers in fiber-optic communication systems), laser printers (configured as laser outputs in printers), medical devices (configured as medical devices for laser treatment, laser surgery, etc.), distance measuring instruments (configured as laser range finders, laser radars, etc.), optical sensors (configured as various optical sensor applications such as photoelectric switches), cutting and welding (configured as material cutting, welding and processing). The small size, high efficiency and tunability of laser chips make them an indispensable part of modern technology and industrial applications.

[0006] When a laser chip is working, a large amount of heat will be generated. If the heat cannot be effectively dissipated, the temperature of the chip will rise, which will affect the performance and stability of the laser. Therefore, heat dissipation is needed during the working process of the laser chip to ensure that the chip can maintain a relatively low temperature during work.

[0007] The existing heat sink for laser chips usually adopts a copper-based or aluminum-based heat sink. These heat sinks utilize the good thermal conductivity of metals to conduct heat away from the chip and carry away the heat through the cooling channels of the heat sink fins.

[0008] However, the inventors have found that these heat sinks still have the following disadvantages:

[0009] 1. The pure aluminum or pure copper material is used, the thermal conductivity of pure aluminum is 205W / m·K-235W / m·K, the heat dissipation efficiency is low, and the heat dissipation effect is poor; the thermal conductivity of copper is 401W / (m·K), but the forming rate of pure copper is less than 50%, the copper material in the design without the heat dissipation area causes material waste, the effective utilization rate is low, and the cost is high;

[0010] 2. The whole product can only be processed by a mechanical process due to the single material whole design, the structure is complex, the processing time is long, the processing cost is high, the product is prone to cracking and deformation, the yield is low, and the service life is short;

[0011] 3. The heat conduction path is limited: the heat conduction path in the heat sink design exists cross, the cooling liquid flow is blocked, the heat conduction efficiency is low or uneven, and the overall heat dissipation effect is affected;

[0012] 4. Different materials of the cooling system: the flow channel and the cooling module of the heat sink are composed of multiple materials, which form an electrochemical reaction during use, causing material electrolytic corrosion, increasing maintenance cost and reducing service life.

[0013] SUMMARY

[0014] In order to solve the problems of unreasonable design, material waste, high cost, easy cracking by only using mechanical processing technology, short service life and poor heat dissipation effect of the heat sink used in the preparation process of the existing semiconductor laser chip, the application provides a laser chip aluminum-copper integrated die-casting composite heat sink preparation process and a heat sink which are more reasonable in design, more cost-saving, not easy to crack, long in service life and good in heat dissipation effect.

[0015] The technical scheme of the application is:

[0016] The application discloses a laser chip aluminum-copper integrated die-casting composite heat sink preparation process, comprising the following steps:

[0017] S1. Preparing an inner core of a heat sink comprising an inner core body and an inner core accessory:

[0018] S11. A copper bar is put into an inner core body mold, and a pulling force is applied to form a plurality of inner core bodies matched with the shape of the inner core body mold, and the inner core bodies are further milled to complete the preparation of the pure copper inner core bodies;

[0019] S12. The prepared inner core bodies and the inner core accessory are welded into one body;

[0020] S13. The inner core body and the inner core accessory welded into one body are subjected to copper polishing, cleaning, nickel plating and drying treatment to complete the preparation of the inner core of the heat sink comprising the inner core body and the inner core accessory;

[0021] S14. The inner core is filled with casting sand;

[0022] S2. Prepare the shell of the heat sink, and form the copper-aluminum composite blank with the inner core integrated with the shell:

[0023] S21. Prepare the aluminum liquid;

[0024] S22. Put the prepared inner core into the counter-gravity cavity mold, fill the cavity mold with the prepared aluminum liquid, and perform die casting processing to form the copper-aluminum composite blank with the aluminum shell wrapping the copper inner core body and the inner core accessories, and then demold and naturally cool to 20-35℃;

[0025] S23. Trim the shell, remove the material belt and slag ladle, and blow and clean the casting sand of the inner core of the heat sink;

[0026] S24. Perform T4+T6 heat treatment on the shell after die casting processing;

[0027] S25. Perform CNC rough machining on the shell after heat treatment;

[0028] S26. Clean and dry the copper-aluminum composite blank after rough machining.

[0029] Optionally, the T4+T6 heat treatment on the shell after die casting processing in step S24 specifically includes the following sub-steps:

[0030] S241. Solution treatment: heat the shell to a solution temperature to make the solute atoms in the shell dissolve into the solvent lattice, the solution temperature is 470-540℃, and the processing time is 2-3h;

[0031] S242. Rapid cooling treatment: quench the shell after solution treatment, and the shell is rapidly cooled to 20-35℃;

[0032] S243. Aging treatment: continuously heat the shell after rapid cooling treatment at a temperature of 120-200℃, and the heating time is 2-3h;

[0033] S244. Natural cooling treatment: place the shell after aging treatment at 20-35℃.

[0034] Optionally, the preparation of the aluminum liquid in step S21 specifically includes the following steps:

[0035] S211. Heat and stir the aluminum material, and add grain refiner to the aluminum material in a solution state to form aluminum water;

[0036] S212. Further perform degassing treatment on the aluminum water with grain refiner to form the prepared aluminum liquid.

[0037] Optionally, the copper throwing, cleaning, nickel plating and drying treatment of the inner core body and the inner core fitting welded together in the step S13 specifically includes: copper throwing of the oxide layer, ultrasonic oil removing agent cleaning, pure water rinsing, then surface nickel plating treatment, followed by air cutting dehydration, then tunnel drying, and the drying temperature is up to 100℃; the cleaning and drying of the integrated copper-aluminum composite blank in the step S26 specifically includes: ultrasonic oil removing agent cleaning, then pure water rinsing, followed by air cutting dehydration, then tunnel drying, and the drying temperature is up to 100℃.

[0038] Optionally, the milling of the inner core body in the step S11 specifically adopts CNC machining process to mill the inner core body; and the CNC rough machining of the shell after heat treatment in the step S25 specifically includes milling and drilling of the shell 3.

[0039] Optionally, the aluminum liquid in the step S21 is prepared by mixing the grain refiner with the aluminum liquid in a weight ratio of 0.2:100.

[0040] Optionally, the die casting solidification shrinkage in the step S22 is performed at a die casting treatment temperature of 500-800℃, a pressure of 80-120MPa, and a time of 150-220s.

[0041] Optionally, the tension applied in the step S11 is 15000-22000N.

[0042] The application further discloses an aluminum-copper integrated die-casting composite heat sink for laser chips, which is prepared by the aluminum-copper integrated die-casting composite heat sink preparation process for laser chips.

[0043] Optionally, the inner core body includes an inner tube and an outer wall, the inner wall of the inner tube is provided with a plurality of heat dissipation grooves, and the outer wall is provided with a plurality of groove strips; the diameter of the inner tube is the same as the inner diameter of the connecting head and the diameter of the pipeline; and the cross section of the heat dissipation groove is peak-tooth-shaped.

[0044] The application has the following beneficial effects:

[0045] (1) In the preparation process, first, the inner core of the heat sink including the inner core main body with copper and the inner core accessory is prepared, and then the inner core is stably arranged in the outer shell during the aluminum shell preparation process by using die casting and T4+T6 heat treatment method. The inner core of the inner core main body with copper is combined with the aluminum shell to form a copper-aluminum piece composite, which has better strength and wear resistance, improves the overall use performance of the heat sink, enables the heat sink to maintain high dimensional stability in an extreme environment of-40℃-280℃, resist cold and hot impact and high temperature and high humidity, and is not simply machined, but also makes the heat sink less likely to crack and deform. In addition, the inner core and the outer shell of the heat sink are respectively subjected to surface finishing to ensure the heat dissipation effect of the heat sink.

[0046] (2) The inner core main body of the heat sink is made of pure copper material, and the outer shell of the heat sink is made of die-cast aluminum material, which is special for special areas and does not cause material waste, thereby saving costs. The design of the heat dissipation groove of the inner core main body increases the heat dissipation area and improves the heat dissipation efficiency. The design of the outer wall groove of the inner core main body makes the connection between the inner core and the outer shell of the heat sink more stable, has strong structural dimensional stability, prolongs the service life, and reduces the maintenance cost. BRIEF DESCRIPTION OF DRAWINGS

[0047] Fig. 1 is a flowchart of the preparation process of the aluminum-copper integrated die-cast composite heat sink for laser chips according to the present application;

[0048] Fig. 2 is a structure schematic diagram of the internal structure perspective of the aluminum-copper integrated die-cast composite heat sink for laser chips according to the present application;

[0049] Fig. 3 is a structure schematic diagram of the inner core of the aluminum-copper integrated die-cast composite heat sink for laser chips according to the present application;

[0050] Fig. 4 is a structure schematic diagram of the cross-sectional structure of the inner core main body of the aluminum-copper integrated die-cast composite heat sink for laser chips according to the present application;

[0051] Fig. 5 is a flowchart of the preparation process of the heat sink according to the present application.

[0052] Fig. 5 is a flowchart of the preparation process of the heat sink according to the present application. DETAILED DESCRIPTION

[0053] In order to make the technical problems, technical solutions and beneficial effects of the present application more clear and explicit, the present application will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and are not intended to limit the present application.

[0054] Example 1: Referring to Fig. 1, a preparation process of an aluminum-copper integrated die-cast composite heat sink for laser chips, comprising the following steps:

[0055] S1. Preparing the inner core of the heat sink including the inner core body 1 and the inner core fitting 2:

[0056] S11. Put the copper bar with 99.9% purity into the inner core body 1 mold, the copper bar with 99% purity is T2 grade copper, and apply a pulling force with a value of 20000N to form a plurality of inner core bodies 1 matching the shape of the inner core body 1 mold, and further mill the inner core body 1, that is, according to the required length of the inner core body 1, the long strip structure drawn is cut into a plurality of inner core bodies 1 with a preset length, and the preparation of the pure copper inner core body 1 is completed.

[0057] In FIG. 4, each inner core body 1 includes an inner tube 4 provided with a heat dissipation groove 6 and an outer wall provided with a groove strip 7, so that the inner core body 1 mold is also provided with a first protrusion matching the shape of the heat dissipation groove 6 and a second protrusion matching the shape of the groove strip 7; the drawing process is simple, convenient and fast to form the required shape, and the thermal conductivity of pure copper is 401 W / (m·K), so that the pure copper inner core body 1 is used as the core component, which does not cause material waste and reduces the production cost.

[0058] S12. Referring to FIGS. 2 and 3, the prepared plurality of inner core bodies 1 and the inner core fitting 2 are welded together, the inner core fitting 2 includes a connecting head 8 and a pipeline 9, the heat sink is provided for the cooling liquid to flow, the pure copper inner core body 1 can also be called a T2 grade copper heat dissipation and heat exchange flow channel, and the cooling liquid can be an advanced coolant, so that the heat sink has a liquid inlet and outlet, the first connecting head 8 can be used as the liquid inlet, the first connecting head 8 is welded and fixed with one end of the first inner core body 1, the second connecting head 8 is used as the liquid outlet, the second connecting head 8 is welded and fixed with one end of the last inner core body 1, two inner core bodies 1 are arranged between the first inner core body 1 and the last inner core body 1, the inner core bodies 1 are communicated through the pipeline 9, and the pipeline 9 is also welded and fixed on the inner core body 1, the inner core is a multi-bend structure, which further increases the heat dissipation area and improves the heat dissipation efficiency; the solid inner core is a reliable cooling circulation system, which can also be called a full-sealed cooling circulation system, and in cooperation with the advanced coolant, the problems of water electrolysis and microorganism generation and flow channel oxidation or corrosion of the cooling liquid in the related art under the working condition are solved, and the heat sink of the present application can be maintained for more than 10 years.

[0059] S13. The welded inner core body 1 and inner core fitting 2 are subjected to copper polishing, cleaning, nickel plating and drying treatment. First, the copper polishing treatment removes the surface oxide layer, and the ultrasonic oil removal agent cleaning can efficiently remove the oil and impurities on the surface of the inner core, ensuring the cleanliness of the inner core surface. Then, pure water rinsing is performed, followed by surface nickel plating treatment to prevent oxidation and reduce the risk of copper and aluminum inter-diffusion at high temperatures. Then, air cutting dehydration is performed to quickly remove water from the surface of the workpiece, reducing water stain residues, facilitating subsequent drying and coating processes. Then, tunnel drying is performed at a maximum drying temperature of 100°C, which can be adjusted according to actual needs. The drying temperature can quickly evaporate the moisture on the surface of the inner core, ensuring that the inner core surface is dry and avoiding problems caused by moisture residues. Pure water rinsing can thoroughly clean the cleaning agent residues and other impurities, avoiding adverse effects on subsequent processes. The preparation of the inner core of the radiator, including the inner core body 1 and the inner core fitting 2, is completed.

[0060] S14. The inner core is filled with casting sand, and the cavity structure can withstand a casting pressure of 100Mpa.

[0061] S2. Prepare the outer shell 3 of the radiator, and form a copper-aluminum composite blank with the inner core and the outer shell 3 integrated:

[0062] S21. Prepare the aluminum liquid, specifically:

[0063] S211. Heat and stir the aluminum material, the model of the aluminum material is A356, the heating temperature is 700-750°C, and the grain refiner is added to the solution state of the aluminum material to form aluminum water.

[0064] S212. Further degassing treatment is performed on the aluminum water with grain refiner to form the required prepared aluminum liquid.

[0065] It is worth noting that the weight ratio of grain refiner to aluminum liquid is 0.2:100. The main function of the grain refiner is to improve the microstructure of the casting, refine the grain, improve the mechanical properties and surface quality of the casting, and reduce defects such as shrinkage and porosity. The main function of the degassing treatment is to remove the gas in the aluminum liquid, reduce the generation of gas holes and improve the density and mechanical properties of the casting.

[0066] S22. Put the prepared inner core into the counter-gravity cavity mold, fill the cavity mold with the prepared aluminum liquid, and perform pressure casting treatment to form a copper-aluminum composite blank with the aluminum outer shell 3 wrapping the copper inner core body 1 and the inner core fitting 2. The pressure casting treatment temperature is 750°C, the pressure is 100MPa, and the time is 180s.

[0067] It is worth noting that the shape of the inner wall of the cavity mold matches the shape of the inner core and the shape of the outer shell, and the aluminum liquid fills the gap of the cavity mold, wrapping the inner core.

[0068] In addition, the copper-aluminum composite blank formed by wrapping the copper inner core body and the inner core fittings with the aluminum shell can be demolded and naturally cooled to 20-35℃.

[0069] S23. The shell 3 is trimmed to remove the sprue and the runner. The sprue and the runner are removed by a saw blade cutting machine. The runner is tail material formed in the material well in the mold during the die casting process. In order to ensure that the part is completely filled in the mold, a material well is arranged in the position which is not easy to fill according to the shape of the product, so that the aluminum liquid is filled more in this area to achieve the purpose of complete filling. The runner refers to the excess material formed in the material package at the inlet of the mold. The material package is a device for supplying metal liquid to the mold during the die casting process, which is located in the feeding system of the die casting machine, and the metal liquid is sent into the mold cavity through the connection with the die casting mold. The casting sand of the inner core of the radiator is blown and cleaned, that is, the casting sand of the inner core of the radiator is blown and cleaned by a high-pressure air gun.

[0070] S24. The shell 3 after the die casting process is subjected to T4+T6 heat treatment, which specifically includes the following steps:

[0071] S241. Solution treatment: the shell 3 is heated to a solution temperature, so that the solute atoms in the shell 3 are melted into the solvent lattice. The solute refers to the substance dissolved in the aluminum solvent, and the solvent lattice refers to the crystal structure of the main component of the shell 3, in which the atoms are arranged in order to form a lattice structure. The solution temperature is 520℃, and the treatment time is 3h. This process can improve the uniformity and hardness of the shell 3, and at the same time adjust the mechanical properties and chemical properties of the alloy.

[0072] S242. Rapid cooling treatment: the shell 3 after the solution treatment is subjected to water quenching treatment, and the shell 3 is rapidly cooled to 20-35℃ to prevent the solute from precipitating out of the solid solution as much as possible.

[0073] S243. Aging treatment: the shell 3 after the rapid cooling treatment is continuously heated at a temperature of 180℃ for 3h to enhance the hardness and strength of the alloy.

[0074] S244. Natural cooling treatment: the shell 3 after the aging treatment is placed at 20-35℃ to allow the solute inside the solid solution of the shell 3 to gradually diffuse and precipitate, forming the required strengthening phase, thereby further improving the hardness and strength of the shell 3.

[0075] The T4+T6 heat treatment can improve the hardness and strength of the alloy by forming a strengthening phase through the precipitation of solid solutes in the solid solution in the alloy, and can improve the hardness of the shell 3 to 95HV or higher; it is worth noting that when the laser chip is in some special application scenarios, such as aerospace, automotive electronics, industrial detection, etc., the environment temperature is -40℃-280℃, the heat sink in the related art is prone to cracking, resulting in the heat sink cannot work normally, while the heat sink of the present application can maintain high dimensional stability, cold and hot impact resistance and high temperature and humidity resistance in the extreme environment of -40℃-280℃.

[0076] S25. The shell 3 after heat treatment is subjected to CNC rough machining, that is, the shell 3 after heat treatment is subjected to CNC cutting machining by using process positioning hole to establish a reference, and XYZ reference is processed, which is convenient for fine positioning and finishing in subsequent processes.

[0077] S26. The copper-aluminum composite blank with an inner core is cleaned and dried. First, ultrasonic oil removal cleaning is performed, which can efficiently remove oil stains and impurities on the surface of the shell 3, and ensure the cleanliness of the surface of the shell 3. Then, pure water rinsing is performed, followed by air cutting dehydration, which can quickly remove water from the surface of the workpiece, reduce water stain residues, and facilitate subsequent drying and coating processes. Finally, tunnel drying is performed, and the maximum drying temperature is 100℃, which can quickly evaporate the water on the surface of the shell 3, ensure the dryness of the surface of the shell 3, and avoid problems caused by water residues. Pure water rinsing can completely remove cleaning agent residues and other impurities, and avoid adverse effects on subsequent processes.

[0078] Optionally, the milling of the inner core body 1 in step S11 is a CNC machining process, and the inner core body 1 is milled; and the CNC rough machining of the shell after heat treatment in step S25 is a fine surface treatment, which ensures the accuracy of the size and shape of the inner core body 1 and the shell 3. The CNC machine automatically processes, greatly improves the production efficiency, reduces the manual operation time and cost, and can maintain stable processing quality during production, reducing errors caused by human factors.

[0079] Embodiment 2: A preparation process of an aluminum-copper integrated die-casting composite heat sink for a laser chip, comprising the following steps:

[0080] S1. Preparing an inner core of a heat sink comprising an inner core body 1 and an inner core fitting 2:

[0081] S11. Put the copper bar with 99.9% purity into the inner core body 1 mold, and apply a pulling force of 15000N to form a plurality of inner core bodies 1 matched with the shape of the inner core body 1 mold, and further mill the inner core body 1, that is, cut the long strip structure drawn into a plurality of inner core bodies 1 with a preset length according to the required length of the inner core body 1, to complete the preparation of the pure copper inner core body 1.

[0082] In FIG. 4, each inner core body 1 includes an inner tube 4 provided with a heat dissipation groove 6 and an outer wall 5 provided with a groove strip 7, and therefore, the inner core body 1 mold is also provided with a first protrusion matched with the shape of the heat dissipation groove 6 and a second protrusion matched with the shape of the groove strip 7; the drawing process is simple, convenient and fast to form the required shape, and the thermal conductivity of pure copper is 401 W / (m·K), so that the pure copper inner core body 1 as the core component will not cause material waste and reduce production cost.

[0083] S12. Referring to FIGS. 2 and 3, the prepared plurality of inner core bodies 1 and inner core fittings 2 are welded together, the inner core fittings 2 are connecting heads 8 and pipelines 9, and the radiator is provided with cooling liquid flow, so that the radiator has liquid inlet and outlet, the first connecting head 8 can be used as the liquid inlet, the first connecting head 8 is welded and fixed with one end of the first inner core body 1, the second connecting head 8 is used as the liquid outlet, the second connecting head 8 is welded and fixed with one end of the last inner core body 1, two inner core bodies 1 are arranged between the first inner core body 1 and the last inner core body 1, the inner core bodies 1 are communicated through the pipelines 9, and the pipelines 9 are also welded and fixed on the inner core bodies 1, the inner core as a whole has a multi-bend structure, which further increases the heat dissipation area and improves the heat dissipation efficiency.

[0084] S13. The inner core body 1 and the inner core fitting 2 welded together are subjected to copper polishing, cleaning, nickel plating and drying treatment. First, copper polishing is performed to remove the surface oxidation layer, and ultrasonic oil removal agent cleaning can efficiently remove the oil stains and impurities on the surface of the inner core to ensure the cleanliness of the surface of the inner core. Then, pure water rinsing is performed, followed by surface nickel plating treatment to prevent oxidation and reduce the risk of mutual solubility of copper and aluminum at high temperature. Then, air cutting dehydration is performed to quickly remove water from the surface of the workpiece, reduce water stain residues, and facilitate subsequent drying and coating processes. Then, tunnel drying is performed, and the maximum drying temperature is 100℃, which can be adjusted according to actual needs. The water on the surface of the inner core can be quickly evaporated to ensure the dryness of the surface of the inner core and avoid problems caused by water residues. Pure water rinsing can completely clean the cleaning agent residues and other impurities to avoid adverse effects on subsequent processes. The preparation of the inner core of the radiator including the inner core body 1 and the inner core fitting 2 is completed.

[0085] S14. Fill the inner core with casting sand, so that the cavity structure can withstand a casting pressure of 100 MPa.

[0086] S2. Prepare the outer shell 3 of the heat sink, and form a copper-aluminum composite blank with the inner core integrated with the outer shell 3:

[0087] S21. Prepare the aluminum liquid, specifically:

[0088] S211. Heat and stir the aluminum material, and add a grain refiner to the aluminum material in a solution state to form aluminum water.

[0089] S212. Further deaerate the aluminum water to which the grain refiner is added to form a prepared aluminum liquid that meets the requirements.

[0090] It is worth noting that the weight ratio of the grain refiner to the aluminum liquid is 0.2:100. The main function of the grain refiner is to improve the microstructure of the casting, refine the grains, improve the mechanical properties and surface quality of the casting, and reduce defects such as shrinkage and porosity. The main function of the deaeration treatment is to remove the gas in the aluminum liquid, reduce the generation of pores and pores, and improve the density and mechanical properties of the casting.

[0091] S22. Place the inner core into the counter-gravity cavity mold, fill the cavity mold with the prepared aluminum liquid, and perform die casting treatment to form a copper-aluminum composite blank with the outer shell 3 of aluminum wrapping the copper inner core main body 1 and the inner core accessory 2. The die casting treatment temperature is 800°C, the pressure is 120 MPa, and the time is 220 s.

[0092] S23. Trim the outer shell 3 to remove the flash and the slag pocket, i.e., use a saw blade cutter to remove the flash and the slag pocket. The flash refers to the protruding part or excess material on the edge of the part formed during the die casting process. The slag pocket refers to the excess material or small pieces of material on the surface or edge of the part formed during the die casting process, usually caused by uneven material flow during the filling process or the angle of the mold contact surface. Also, the casting sand in the inner core of the heat sink is blown and removed, i.e., the casting sand in the inner core of the heat sink is blown and removed using a high-pressure air gun.

[0093] S24. Perform T4+T6 heat treatment on the outer shell 3 after die casting, specifically including the following steps:

[0094] S241. Solution treatment: heat the outer shell 3 to the solution temperature, so that the solute atoms in the outer shell 3 are dissolved into the solvent lattice. The solute refers to the substance dissolved in the aluminum solvent, and the solvent lattice refers to the crystal structure of the main component of the outer shell, in which the atoms are arranged in order to form a lattice structure. The solution temperature is 540°C, and the treatment time is 3 h. This process can improve the uniformity and hardness of the outer shell, and adjust the mechanical properties and chemical properties of the alloy.

[0095] S242. Rapid cooling treatment: the shell 3 after solid solution treatment is quenched, and the shell is rapidly cooled to 20-35℃ to prevent solute from precipitating out of the solid solution as much as possible.

[0096] S243. Aging treatment: the shell 3 after rapid cooling treatment is heated at a temperature of 200℃ for 3h to enhance the hardness and strength of the alloy.

[0097] S244. Natural cooling treatment: the shell 3 after aging treatment is placed at 20-35℃ to allow the solute inside the solid solution of the shell 3 to gradually diffuse and precipitate to form the desired strengthening phase, thereby further improving the hardness and strength of the shell 3.

[0098] The inner core of the copper inner core body is combined with the aluminum outer shell to form a copper-aluminum composite, and the composite is a composite blank, which has better strength and wear resistance. The T4+T6 heat treatment described above precipitates the solute in the solid solution to form a strengthening phase in the alloy, thereby improving the hardness and strength of the alloy, and the hardness of the shell 3 can be improved to more than 95HV. It is worth noting that when the laser chip is in some special application scenarios, such as aerospace, automotive electronics, industrial detection, etc., the environment temperature is -40-280℃, and the heat sink in the related art is prone to cracking, which causes the heat sink to fail to work normally. The heat sink of the present application can maintain high dimensional stability, cold and hot impact resistance, and high temperature and high humidity resistance in an extreme environment of -40-280℃.

[0099] S25. The blank after heat treatment is processed by CNC cutting with process positioning hole to establish a reference to process XYZ reference for precise positioning and finishing in subsequent processes.

[0100] S26. The integrated heat sink with inner core is cleaned and dried. First, ultrasonic oil removal cleaning is performed to efficiently remove oil stains and impurities on the surface of the shell 3, ensuring the cleanliness of the surface of the shell 3. Then, pure water rinsing is performed, followed by air cutting dehydration to quickly remove water from the surface of the workpiece, reduce water stain residues, and facilitate subsequent drying and coating processes. Finally, tunnel drying is performed at a maximum drying temperature of 100℃ to quickly evaporate the water on the surface of the shell 3, ensuring the dryness of the surface of the shell 3 and avoiding problems caused by water residues. Pure water rinsing can completely remove cleaning agent residues and other impurities, avoiding adverse effects on subsequent processes.

[0101] Optionally, the milling of the inner core body 1 in step S11 is CNC machining, and the inner core body 1 is milled; and the CNC rough machining of the outer shell after heat treatment in step S25 is finely surface treated, so as to ensure the accuracy of the size and shape of the inner core body 1 and the outer shell 3. The CNC machine automatically processes, greatly improves the production efficiency, reduces the manual operation time and cost, and can maintain stable processing quality in the production process, thereby reducing the error caused by human factors.

[0102] In the embodiment 3, referring to FIGS. 2 to 4, the application further discloses an aluminum-copper integrated die-casting composite heat sink for laser chips, which is prepared by using the aluminum-copper integrated die-casting composite heat sink for laser chips and the preparation process described above. The heat sink comprises four inner core bodies 1, an inner core accessory 2 and an outer shell 3. The inner core accessory 2 comprises two connecting heads 8 and three pipe sections 9. One connecting head 8 is welded and fixed to one end of the first inner core body 1, and the other connecting head 8 is welded and fixed to one end of the last inner core body 1. The pipe sections 9 connect the first and last ends of the inner core bodies 1. The outer shell 3 wraps the inner core bodies 1 and the inner core accessory 2. The inner core of the heat sink is used for flowing cooling liquid. Therefore, the heat sink has liquid inlets and outlets. The first connecting head 8 can be used as a liquid inlet, and the second connecting head 8 can be used as a liquid outlet. Two inner core bodies 1 are arranged between the first inner core body 1 and the last inner core body 1, and the inner core bodies 1 are connected by the pipe sections 9. The pipe sections 9 are also welded and fixed to the inner core bodies 1. The inner core has a multi-bend structure, which further increases the heat dissipation area and improves the heat dissipation efficiency. The inner core body 1 is made of pure copper, and the outer shell 3 is made of die-casting aluminum. The core for flowing cooling liquid is made of pure copper, and the outer shell 3 is configured to protect the inner core. Therefore, the outer shell 3 is made of die-casting aluminum. The design is reasonable, does not cause material waste, has high effective utilization rate, and reduces the cost.

[0103] The inner core body can be any one of welding combination, mechanical combination, metallurgical combination or other types of combination. Of course, the inner core body includes but is not limited to welding combination, mechanical combination, metallurgical combination or other types of combination.

[0104] Optionally, the diameter of the inner tube 4 is the same as the inner diameter of the connecting head 8 and the diameter of the pipe section 9, so as to ensure the flowing of the cooling liquid in the inner core of the heat sink and prevent the leakage of the cooling liquid.

[0105] Optionally, the inner core body 1 comprises an inner tube 4 and an outer wall 5, the inner wall of the inner tube 4 is provided with a plurality of heat dissipation grooves 6, the cross section of the heat dissipation grooves 6 is peak-tooth-shaped, the peak-tooth-shaped heat dissipation grooves 6 further increase the heat dissipation area, and the heat dissipation grooves 6 dissipate heat during the working process of the laser chip, so as to ensure that the chip can maintain a lower temperature during working; the outer wall 5 is provided with a plurality of groove strips 7, the groove strips 7 are designed to make the inner core and the shell 3 more closely connected after being integrally formed by die casting, that is, the outer wall is a reverse buckling structure; in particular, when the laser chip is used in some special application scenarios, such as aerospace, automobile electronics, industrial detection and the like, and the environmental temperature is-40℃-280℃, the heat sink in the related art is prone to cracking, which causes the heat sink to fail to work normally, and the design of the groove strips 7 can make the metal structure interlock even if it is deformed in an extreme environment, so as to ensure that the inner core is stably in the shell 3 and is not prone to cracking.

[0106] In the embodiment, the first end of the first inner core body 1 is welded and fixed to the first connecting head 8, and the second end of the last inner core body 1 is welded and fixed to the second connecting head 8.

[0107] In the embodiment, the number of the plurality of inner core bodies 1 can be four, five or six, and the number of the inner core bodies 1 is not particularly limited.

[0108] The inner core body 1 of the heat sink is used for flowing of the cooling liquid, so the heat sink has liquid inlets and outlets, the plurality of connecting heads 8 can comprise a first connecting head 8 and a second connecting head 8, the first connecting head 8 can be used as a liquid inlet, and the second connecting head 8 can be used as a liquid outlet, the first connecting head 8 is welded and fixed to the first end of the first inner core body 1, the second connecting head 8 is welded and fixed to the first end of the last inner core body 1, and two inner core bodies 1 can be arranged between the first inner core body 1 and the last inner core body 1, and the inner core bodies 1 are communicated through the pipeline 9.

[0109] It is worth noting that the first connecting head 8 can also be used as a liquid outlet, and the second connecting head 8 can also be used as a liquid inlet, and the embodiment is not particularly limited.

[0110] In the embodiment, the first end of the first inner core body 1 is welded and fixed to the first connecting head 8, and the second end of the last inner core body 1 is welded and fixed to the second connecting head 8.

[0111] Optionally, the heat sink provided in the embodiment is at least applied to the following fields: laser chip, data center, high-performance computer, artificial intelligence and energy storage.

[0112] For the field of laser chips, it provides an important guarantee for the normal, efficient and stable operation of laser chips, prevents the performance degradation or even damage of chips due to overheating, ensures the uniform temperature of each part of the chip, guarantees the consistency of its output performance, and improves the quality and stability of laser output.

[0113] For the field of data centers, it effectively reduces the temperature of servers and removes the heat generated during data processing in data centers through heat exchange, ensuring stable operation and improving the energy utilization efficiency of data centers.

[0114] For the field of high-performance computers and artificial intelligence, high-performance computers, supercomputers, and artificial intelligence computing require handling a large number of complex operations, which generates extremely high heat. The heat sink can meet the heat dissipation requirements and ensure the full play of computing performance.

[0115] For the field of energy storage, battery cells generate heat during high-power charging and discharging. Cooling the battery cell module through the heat sink helps maintain the optimal working temperature of the battery cell and prolongs its life and improves its safety.

[0116] It is worth noting that the heat sink has important applications in fields with high heat dissipation requirements, and its application range will further expand with the continuous development of technology and the reduction of costs.

[0117] Optionally, the inner core body 1 includes an inner tube 4 and an outer wall 5, and the inner wall of the inner tube 4 is provided with a plurality of heat dissipation grooves 6, and the outer wall 5 is provided with a plurality of groove strips 7.

[0118] The heat dissipation grooves 6 are used for heat dissipation during the working process of the laser chip to ensure that the chip can maintain a low temperature during work.

[0119] The groove strips 7 are designed to make the inner core and the outer shell 3 integrally formed by pressure casting, i.e., the outer wall is a reverse buckling structure, and the connection between the inner core and the outer shell 3 is more compact. For example, when the laser chip is used in some special application scenarios such as aerospace, automotive electronics, and industrial detection, the environment temperature is -40℃-280℃, and the heat sink in related technologies is prone to cracking, which causes the heat sink to fail to work normally. The design of the groove strips 7 can make the metal structure deform even in extreme environments, but it can still be buckled, ensuring that the inner core is stable in the outer shell 3 and is not prone to cracking.

[0120] Optionally, the diameter of the inner tube 4 is the same as the inner diameter of the connecting head 8 and the diameter of the pipeline 9.

[0121] In this embodiment, the diameter of the inner tube 4 is the same as the inner diameter of the connecting head 8 and the diameter of the pipeline 9, which can ensure the flow of the cooling liquid in the inner core of the heat sink and prevent the leakage of the cooling liquid.

[0122] Optionally, the cross section of the heat dissipation groove 6 is any one of the following through hole structures: peak-tooth shape, round hole shape, mesh shape, sponge shape.

[0123] Of course, the cross section of the heat dissipation groove 6 includes but is not limited to the through hole structures such as peak-tooth shape, round hole shape, mesh shape, sponge shape, etc.

[0124] Among them, the cross section of the heat dissipation groove 6 is a through hole structure, and the heat dissipation groove 6 with the through hole structure can increase the heat dissipation area and dissipate heat during the working process of the laser chip to ensure that the chip can maintain a lower temperature during working.

[0125] Optionally, the plurality of inner core bodies 1 are multi-bend channel structures.

[0126] The plurality of inner core bodies 1 are multi-bend channel structures, which can increase the heat dissipation area, improve the heat dissipation efficiency, and the solid structure of the inner core is a reliable cooling circulation system, which can also be called a fully sealed cooling circulation system. With the cooperation of advanced cooling liquid, the problems of water electrolysis and microorganism generation and flow channel oxidation or corrosion of the cooling liquid in the related art under the working condition are solved, and the radiator of the present application can be maintained for more than 10 years.

[0127] Optionally, the pipeline 9 is welded and fixed on the inner core body 1.

[0128] Optionally, the inner core body 1 is a first material, and the shell 3 is a second material.

[0129] Among them, the first material is any one of the following high thermal conductivity materials: copper, silver, diamond, boron nitride, and the second material is any one of the following die casting materials: aluminum alloy, zinc alloy, magnesium alloy.

[0130] If the inner core body 1 is a pure copper material and the shell 3 is a die-cast aluminum material, the core for the cooling liquid to flow is made of pure copper material, and the shell 3 is configured to protect the inner core. Therefore, the shell 3 is made of die-cast aluminum material, which is reasonable in design and does not cause material waste, has high effective utilization rate, and reduces cost. At the same time, it can avoid limiting the entire product to be processed only by mechanical process, improve the yield of finished products and service life.

[0131] Embodiment 5: With reference to FIG. 5, the present application also discloses a radiator preparation process, comprising:

[0132] S3. Preparing the inner core of the radiator including the inner core body 1 and the inner core accessory 2.

[0133] The inner core body 1 and the inner core accessory 2 are prepared, and the inner core body and the inner core accessory are welded into one body to prepare the inner core of the radiator.

[0134] Referring to FIG. 4, each inner core body 1 includes an inner tube 4 provided with heat dissipation grooves 6 and an outer wall provided with groove strips 7, and therefore the inner core body 1 mold is also provided with a first protrusion matched with the shape of the heat dissipation grooves 6 and a second protrusion matched with the shape of the groove strips 7; the drawing process is simple and convenient to form the required shape, and the thermal conductivity of pure copper is 401 W / (m·K), so that the inner core body 1 of pure copper is used as the core component, which does not cause material waste and reduces the production cost.

[0135] Optionally, S3. Preparing the inner core of the heat sink including the inner core body and the inner core accessory can include:

[0136] S31. A first material is put into the inner core body 1 mold, and a pulling force is applied to form a plurality of inner core bodies 1 matched with the shape of the inner core body 1 mold, and the inner core body 1 is milled to prepare the inner core body 1.

[0137] The first material can be copper, for example, a copper bar with a purity of 99.9% is put into the inner core body 1 mold, and a pulling force is applied, the pulling force value is in the range of 15000N-22000N, and the pulling force value can be 20000N, to form a plurality of inner core bodies 1 matched with the shape of the inner core body 1 mold.

[0138] The inner core body 1 is milled, that is, according to the required length of the inner core body 1, the drawn long strip structure is cut into a plurality of inner core bodies 1 with a preset length, and the preparation of the pure copper inner core body 1 is completed.

[0139] S32. The prepared plurality of inner core bodies 1 and the inner core accessory 2 are welded together.

[0140] The inner core accessory 2 includes a plurality of connecting heads 8 and a plurality of pipes 9, one connecting head 8 is welded and fixed to one end of the first inner core body 1, another connecting head 8 is welded and fixed to one end of the last inner core body 1, and the pipes 9 connect the first and last inner core bodies 1.

[0141] It is worth mentioning that the radiator is provided with a liquid inlet and a liquid outlet, the first connecting head 8 can be used as the liquid inlet, the first connecting head 8 is welded and fixed to one end of the first inner core body 1, the second connecting head 8 is used as the liquid outlet, the second connecting head 8 is welded and fixed to one end of the last inner core body 1, two inner core bodies 1 are arranged between the first inner core body 1 and the last inner core body 1, the inner core bodies 1 are connected through the pipelines 9, and the pipelines 9 are also welded and fixed to the inner core bodies 1, the inner core body has a multi-bend structure, and the heat dissipation area is further increased, and the heat dissipation efficiency is improved; the inner core body is a reliable cooling circulation system, which can also be called a fully-closed cooling circulation system, and cooperates with the advanced cooling liquid to solve the problems of water electrolysis and microorganism generation and flow channel oxidation or corrosion of the cooling liquid in the related art, and the radiator can be maintained free of maintenance for more than 10 years.

[0142] S33. The inner core body 1 and the inner core fitting 2 welded as a whole are polished, cleaned, nickel-plated and dried to prepare the inner core.

[0143] The inner core body 1 and the inner core fitting 2 welded as a whole are polished to remove the surface oxide layer, and are cleaned to remove the oil stains and impurities on the surface of the inner core, so that the cleanliness of the surface of the inner core is ensured, and then the inner core body 1 and the inner core fitting 2 welded as a whole are nickel-plated to prevent oxidation and reduce the risk of mutual solubility of copper and aluminum at high temperature.

[0144] After nickel plating, the inner core body 1 and the inner core fitting 2 welded as a whole are dried to evaporate the moisture on the surface of the inner core, so that the surface of the inner core is dry, and problems caused by residual moisture are avoided. Thus, the preparation of the inner core of the radiator including the inner core body 1 and the inner core fitting 2 is completed.

[0145] Optionally, S33. The inner core body and the inner core fitting welded as a whole are polished, cleaned, nickel-plated and dried, which can include:

[0146] The inner core body and the inner core fitting welded as a whole are sequentially polished, ultrasonic oil removal agent cleaned, pure water rinsed, surface nickel-plated, air-dried and tunnel-dried.

[0147] The inner core body 1 and the inner core fitting 2 welded as a whole are polished, for example, copper polishing, to remove the surface oxide layer, and are ultrasonic oil removal agent cleaned, which can efficiently remove the oil stains and impurities on the surface of the inner core, so that the cleanliness of the surface of the inner core is ensured.

[0148] Then the inner core body 1 and the inner core accessory 2 welded as a whole are subjected to pure water rinsing and surface nickel plating treatment. The pure water rinsing can thoroughly clean the cleaning agent residues and other impurities, avoiding adverse effects on subsequent processes. The surface nickel plating treatment prevents oxidation and reduces the risk of mutual solubility of copper and aluminum at high temperatures. Then air cutting dehydration and tunnel drying are performed to complete the preparation of the inner core of the radiator including the inner core body 1 and the inner core accessory 2. The air cutting dehydration can quickly remove water from the surface of the workpiece, reducing water stains and facilitating subsequent drying and coating processes. The tunnel drying temperature can be up to a preset temperature (e.g., 100°C), which can be adjusted according to actual needs, and the water on the surface of the inner core can be quickly evaporated to ensure the dryness of the inner core surface and avoid problems caused by water residues.

[0149] S34. Fill the inner core with casting sand.

[0150] By filling the inner core with casting sand, the cavity structure can withstand a preset casting pressure (e.g., 100 Mpa).

[0151] S4. Prepare the outer shell 3 of the radiator and form a metal composite blank with the inner core integrated with the outer shell 3.

[0152] The outer shell of the radiator can be a second material. The preparation of the outer shell 3 of the radiator and the formation of a metal composite blank with the inner core integrated with the outer shell 3 as a radiator, for example, can be a copper-aluminum composite blank.

[0153] Optionally, S4. Preparing the outer shell 3 of the radiator and forming a metal composite blank with the inner core integrated with the outer shell 3 can include:

[0154] S41. Prepare the second material liquid.

[0155] The second material liquid can be an aluminum liquid.

[0156] Optionally, S41. Preparing the second material liquid can include:

[0157] S411. Heat and stir the second material and add a grain refiner to the second material in a solution state to form a second material water.

[0158] S412. Perform degassing treatment on the second material water with the grain refiner to prepare the second material liquid.

[0159] The second material can be aluminum, for example. The second material (e.g., aluminum material) is heated and stirred, and a grain refiner is added to the aluminum material in a solution state to form a second material water (e.g., aluminum water).

[0160] It is worth noting that the model of the aluminum material is A356, and the heating temperature is 700-750°C, which is not particularly limited in this embodiment.

[0161] Then, the second material water added with the grain refiner is degassed to prepare the second material liquid (e.g. aluminum liquid) meeting the requirements.

[0162] It is worth mentioning that the weight ratio of the grain refiner to the second material liquid can be 0.2:100. The grain refiner mainly improves the microstructure of the casting, refines the grain, improves the mechanical properties and surface quality of the casting, and reduces defects such as shrinkage and porosity. The degassing treatment mainly removes the gas in the second material liquid, reduces the porosity and the generation of porosity, and improves the density and mechanical properties of the casting.

[0163] S42. The prepared inner core is placed in the anti-gravity cavity mold, the prepared second material liquid is filled into the anti-gravity cavity mold, and the die casting process is performed to form a metal composite blank of the first material shell wrapping the inner core body and the inner core accessory of the second material, and the mold is demolded and naturally cooled to a first temperature.

[0164] The prepared inner core is placed in the anti-gravity cavity mold, the prepared second material liquid is filled into the anti-gravity cavity mold, and the die casting process is performed to form a metal composite blank of the first material shell (e.g. aluminum shell 3) wrapping the inner core body 1 and the inner core accessory 2 of the second material (e.g. copper).

[0165] Optionally, the temperature range of the die casting process is 500-800℃, the pressure range is 80-120MPa, and the time range is 150-220s.

[0166] In this embodiment, the die casting process temperature can be 750℃, the pressure can be 100MPa, and the time can be 180s, or the die casting process temperature can be 800℃, the pressure can be 120MPa, and the time can be 220s.

[0167] It is worth mentioning that the shape of the inner wall of the anti-gravity cavity mold matches the shape of the inner core and the shape of the shell, and the second material liquid fills the gap of the cavity mold to wrap the inner core.

[0168] S43. The first material shell is trimmed to remove the material belt and the slag ladle, and the casting sand of the inner core is blown and cleaned.

[0169] The strip and the ladle are removed, that is, the strip and the ladle are removed by using a saw blade cutting machine. The strip is tail material formed in a material well in a mold during die casting. In order to ensure that a part is completely filled in the mold, a material well is arranged at a position where filling is not easy according to the shape of the product, so that more aluminum liquid is filled in this area to achieve the purpose of complete filling. The ladle refers to the excess material formed in the material package at the inlet of the mold. The material package is a device for supplying metal liquid to the mold during die casting, which is located in the feeding system of the die casting machine. The metal liquid is sent into the mold cavity by connecting with the die casting mold, and the casting sand in the inner core of the radiator is blown and cleaned, that is, the casting sand in the inner core of the radiator is blown and cleaned by using a high-pressure air gun.

[0170] Optionally, S31. Milling the inner core body can include:

[0171] The inner core body is milled by using a mechanical processing process.

[0172] For example, the inner core body 1 is milled by using a CNC mechanical processing process.

[0173] S44. The first material shell after the die casting process is subjected to heat treatment.

[0174] For example, the first material shell after the die casting process is subjected to T4+T6 heat treatment.

[0175] Optionally, S44. The first material shell after the die casting process is subjected to heat treatment can include:

[0176] S441. The first material shell is heated to a solid solution temperature, so that solute atoms in the first material shell are dissolved into solvent crystal lattices.

[0177] In this embodiment, the shell 3 made of the first material is heated to a solid solution temperature, so that solute atoms in the shell 3 are dissolved into solvent crystal lattices. The solute refers to a substance dissolved in an aluminum solvent, and the solvent crystal lattice refers to the crystal structure of the main component of the shell 3. The atoms are arranged in order to form a crystal lattice structure. The solid solution temperature can be 520℃, and the processing time can be 3h. This process can improve the uniformity and hardness of the shell 3, and adjust the mechanical properties and chemical properties of the alloy. The solid solution temperature and the processing time are not particularly limited in this embodiment.

[0178] It is worth noting that the above T4+T6 heat treatment can improve the hardness and strength of the alloy by forming a strengthening phase through the precipitation of solid solutes in the solid solution in the alloy, and can improve the hardness of the shell 3 to above 95HV; it is worth noting that when the laser chip is in some special application scenarios, such as aerospace, automotive electronics, industrial detection, etc., the environment temperature is-40℃-280℃, the heat sink in the related technology is easy to crack, which causes the heat sink to be unable to work normally, and the heat sink in the present application can maintain high dimensional stability, cold and hot impact resistance and high temperature and humidity resistance in-40℃-280℃ extreme environment.

[0179] S442. Quenching the first material shell after solid solution treatment.

[0180] The shell 3 after solid solution treatment is quenched, that is, the first material shell after solid solution treatment is rapidly cooled to a preset temperature, such as 20-35℃, so as to prevent solute from precipitating out of the solid solution as much as possible. The present embodiment does not particularly limit the preset temperature.

[0181] S443. The first material shell after quenching is continuously heated at a second temperature for a preset time.

[0182] The shell 3 after rapid cooling is continuously heated at a second temperature for a preset time to enhance the hardness and strength of the alloy. The second temperature may be, for example, 180℃, and the preset time may be, for example, 3h. The present embodiment does not particularly limit the second temperature and the preset time.

[0183] S444. The first material shell after heating is placed at a third temperature.

[0184] The heated shell 3 is placed at a third temperature to allow the solute inside the solid solution of the shell 3 to gradually diffuse and precipitate, forming the required strengthening phase, thereby further improving the hardness and strength of the shell 3. The third temperature may be, for example, 20-35℃. The present embodiment does not particularly limit the third temperature.

[0185] S45. Rough machining of the first material shell after heat treatment.

[0186] For example, the first material shell after heat treatment is CNC rough machined to finely process the surface, ensuring the accuracy of the size and shape of the inner core body 1 and the shell 3. CNC machining is automatically processed, greatly improving production efficiency, reducing manual operation time and cost, and maintaining stable processing quality during production, reducing errors caused by human factors.

[0187] Optionally, S45. Rough machining of the first material shell after heat treatment can include:

[0188] The first material shell after heat treatment is cut.

[0189] The shell 3 after heat treatment is established by process positioning hole to establish the benchmark for CNC cutting to process XYZ benchmark, which is convenient for precise positioning and finishing in subsequent processes.

[0190] S46. The rough-machined integrated metal composite blank is cleaned and dried.

[0191] The rough-machined integrated metal composite blank is cleaned and dried, wherein the metal composite blank can be ultrasonic oil removal agent cleaned, which can efficiently remove oil stains and impurities on the surface of the shell 3, ensure the cleanliness of the surface of the shell 3, then pure water rinsing, then air cutting dehydration, which can quickly remove water from the surface of the workpiece, reduce water stains, which is conducive to subsequent drying and coating process, finally tunnel drying, the highest drying temperature is 100℃, which can quickly evaporate the water on the surface of the shell 3, ensure the dryness of the surface of the shell 3, avoid the problems caused by water residue, pure water rinsing can completely clean the cleaning agent residue and other impurities, avoid the adverse effects on subsequent processes.

[0192] The above-described embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as limiting the scope of the patent of the present application. It should be noted that for ordinary skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims. Industrial applicability

[0193] The application provides a composite heat dissipator prepared by an aluminum-copper integrated die-casting process for a laser chip, an inner core of the heat dissipator is prepared first, the inner core including a copper-containing inner core main body and an inner core accessory, then the inner core is stably arranged in an aluminum outer shell during aluminum shell preparation by using a die-casting and T4+T6 heat treatment method, the inner core of the copper-containing inner core main body is combined with the aluminum outer shell to form a copper-aluminum piece composite, the strength and wear resistance are better, the use performance of the heat dissipator as a whole is improved, the heat dissipator can maintain high dimensional stability, resist cold and hot impact and resist high temperature and high humidity in an extreme environment of-40 DEG C to 280 DEG C, and is not simply mechanically processed, so that the heat dissipator is not prone to cracking and deformation, the inner core and the outer shell of the heat dissipator are respectively subjected to surface finishing, the heat dissipation effect of the heat dissipator is guaranteed, the inner core main body of the heat dissipator is made of pure copper material, the outer shell of the heat dissipator is made of die-casting aluminum material, and the heat dissipator is special for a special area, so that material waste is avoided and cost is saved; the heat dissipation groove design of the inner core main body increases the heat dissipation area and improves the heat dissipation efficiency; the design of the outer wall groove strip of the inner core main body makes the connection between the inner core and the outer shell of the heat dissipator more stable, the structural size has strong stability, the service life is prolonged, and the maintenance cost is reduced.

Claims

1. A preparation process of an aluminum-copper integrated die-casting composite heat sink for a laser chip, characterized in that, The method comprises the following steps: S1. preparing an inner core of a heat sink comprising an inner core body and an inner core fitting: S11. placing copper bars into an inner core body mold and applying a pulling force to form a plurality of inner core bodies matching the shape of the inner core body mold, and further milling the inner core bodies to complete the preparation of the pure copper inner core body; S12. welding the prepared plurality of inner core bodies and the inner core fitting into one body; S13. performing copper polishing, cleaning, nickel plating and drying treatment on the inner core body and the inner core fitting welded into one body to complete the preparation of the inner core of the heat sink comprising the inner core body and the inner core fitting; S14. filling the inner core with casting sand; S2. preparing an outer shell of the heat sink and forming a copper-aluminum composite blank with the inner core integrated with the outer shell: S21. preparing aluminum liquid; S22. placing the prepared inner core into a counter-gravity cavity mold, filling the cavity mold with the prepared aluminum liquid, and performing die casting treatment to form a copper-aluminum composite blank with the aluminum outer shell wrapping the copper inner core body and the inner core fitting, and then demolding and naturally cooling to 20-35℃; S23. trimming the outer shell, removing the material belt and slag ladle, and blowing and removing the casting sand of the inner core of the heat sink; S24. performing T4+T6 heat treatment on the outer shell after die casting treatment; S25. performing CNC rough machining on the outer shell after heat treatment; S26. cleaning and drying the integrated copper-aluminum composite blank after rough machining.

2. The process for manufacturing aluminum-copper integrated die-casting composite heat sink for laser chip according to claim 1, characterized in that, The T4+T6 heat treatment on the outer shell after die casting treatment in step S24 specifically comprises the following sub-steps: S241. solid solution treatment: heating the outer shell to a solid solution temperature to make the solute atoms in the outer shell dissolve into the solvent lattice, the solid solution temperature is 470-540℃, and the treatment time is 2-3h; S242. rapid cooling treatment: quenching the outer shell after solid solution treatment, and the outer shell is rapidly cooled to 20-35℃; S243. aging treatment: continuously heating the outer shell after rapid cooling treatment at a temperature of 120-200℃, and the heating time is 2-3h; S244. natural cooling treatment: placing the outer shell after aging treatment at 20-35℃.

3. The process for preparing aluminum-copper integrated die-casting composite heat sink for laser chip according to claim 1 or 2, characterized in that, The preparation of aluminum liquid in step S21 specifically comprises the following steps: S211. heating and stirring aluminum materials, and adding grain refiner to the aluminum materials in solution state to form aluminum water; S212. further performing degassing treatment on the aluminum water with grain refiner to form the prepared aluminum liquid.

4. The process for manufacturing aluminum-copper integrated die-casting composite heat sink for laser chip according to any one of claims 1-3, characterized in that, The copper polishing, cleaning, nickel plating and drying treatment on the inner core body and the inner core fitting welded into one body in step S13 specifically comprises: removing the oxide layer by copper polishing, ultrasonic oil removal cleaning, pure water rinsing, then surface nickel plating treatment, then air cutting dehydration, and then tunnel drying with the maximum drying temperature being 100℃; the cleaning and drying of the integrated copper-aluminum composite blank in step S26 specifically comprises: ultrasonic oil removal cleaning, then pure water rinsing, then air cutting dehydration, and then tunnel drying with the maximum drying temperature being 100℃.

5. The process for manufacturing aluminum-copper integrated die-casting composite heat sink for laser chip according to any one of claims 1-4, characterized in that, The inner core body milling in the step S11 is specifically adopting a CNC machining process to mill the inner core body; and the step S25 of performing CNC rough machining on the shell after heat treatment, specifically cutting the shell.

6. The process for manufacturing aluminum-copper integrated die-casting composite heat sink for laser chip according to claim 3, characterized in that, The step S21 of adjusting the aluminum liquid, the weight ratio of the grain refiner to the aluminum liquid is 0.2:

100.

7. The process for manufacturing aluminum-copper integrated die-casting composite heat sink for laser chip according to any one of claims 1-6, characterized in that, The step S22 of die casting solidification shrinkage, the die casting treatment temperature is 500-800℃, the pressure is 80-120MPa, and the time is 150-220s.

8. The process for manufacturing aluminum-copper integrated die-casting composite heat sink for laser chip according to any one of claims 1-7, characterized in that, The step S11 of applying tension, the tension value is 15000-22000N.

9. An aluminum-copper integrated die-casting composite heat sink for a laser chip, characterized by, The laser chip aluminum-copper integrated die-casting composite heat sink is prepared by the preparation process of any one of claims 1-8, comprising: a plurality of inner core bodies, inner core accessories and a shell, the inner core accessories comprising a plurality of connecting heads and a plurality of pipes, one of the connecting heads being welded and fixed to one end of the first inner core body, the other connecting head being welded and fixed to one end of the last inner core body, the pipes connecting the first and last inner core bodies, and the shell being wrapped and welded to the integrated inner core bodies and inner core accessories.

10. The aluminum-copper integrated die-casting composite heat sink for a laser chip according to claim 9, characterized by, The inner core body comprises an inner tube and an outer wall, the inner wall of the inner tube is provided with a plurality of heat dissipation grooves, and the outer wall is provided with a plurality of groove strips, the diameter of the inner tube is the same as the inner diameter of the connecting head and the diameter of the pipe, and the cross section of the heat dissipation groove is peak-tooth-shaped.

11. A heat spreader, comprising: Comprising: A plurality of inner core bodies, inner core accessories and a shell, the inner core accessories comprising a plurality of connecting heads and a plurality of pipes, one of the connecting heads being welded and fixed to one end of the first inner core body, the other connecting head being welded and fixed to one end of the last inner core body, the pipes connecting the first and last inner core bodies, and the shell being wrapped and welded to the integrated inner core bodies and inner core accessories; the inner core body is any one of welding combination, mechanical combination, metallurgical combination or other types of combination.

12. The heat spreader of claim 11, wherein, The inner core body comprises an inner tube and an outer wall, the inner wall of the inner tube is provided with a plurality of heat dissipation grooves, and the outer wall is provided with a plurality of groove strips; the diameter of the inner tube is the same as the inner diameter of the connecting head and the diameter of the pipe; the cross section of the heat dissipation groove is any one of the following through hole structures: peak-tooth-shaped, round hole-shaped, net-shaped, sponge-shaped.

13. The heat sink of any of claims 11-12, wherein, The inner core body is a first material, and the shell is a second material.

14. The heat sink of any of claims 11-12, wherein, The first material is any one of the following high-thermal-conductivity materials: copper, silver, diamond, boron nitride; and the second material is any one of the following die-casting materials: aluminum alloy, zinc alloy, magnesium alloy.

15. The heat sink of any of claims 11-14, wherein, The heat sink is at least applied to the following fields: laser chip, data center, high-performance computer, artificial intelligence, energy storage.

16. A heat spreader production process characterized by, Comprising: Preparation of the inner core of the heat sink comprising the inner core body and the inner core accessory; Preparation of the shell of the heat sink, and forming the metal composite blank of the integrated inner core and the shell.

17. The heat spreader fabrication process of claim 16, wherein, The preparation of the inner core of the heat sink comprising the inner core body and the inner core accessory comprises: The first material is put into the inner core body mold and a pulling force is applied to form a plurality of inner core bodies matching the shape of the inner core body mold, and the inner core bodies are milled to prepare the inner core bodies; The prepared inner core bodies and the inner core fittings are welded together; The inner core bodies and the inner core fittings welded together are polished, cleaned, nickel-plated, and dried to prepare the inner core; The inner core is filled with casting sand; The outer shell of the heat sink is prepared, and the metal composite blank of the inner core integrated with the outer shell is formed, comprising: The second material liquid is prepared; The prepared inner core is put into the counter-gravity cavity mold, and the prepared second material liquid is filled into the counter-gravity cavity mold for die casting treatment to form a metal composite blank of the inner core body and the inner core fitting wrapped by the first material shell, and the metal composite blank is demolded and naturally cooled to a first temperature; The first material shell is trimmed to remove the material belt and the slag ladle, and the casting sand of the inner core is blown and cleaned; The first material shell after die casting treatment is subjected to heat treatment; The first material shell after heat treatment is subjected to rough machining; The integrated metal composite blank after rough machining is cleaned and dried.

18. The heat spreader fabrication process of claim 17, wherein, The heat treatment of the first material shell after die casting treatment comprises: The first material shell is heated to a solid solution temperature, so that the solute atoms in the first material shell are dissolved into the solvent crystal lattice; The first material shell after solid solution treatment is subjected to water quenching treatment; The first material shell after water quenching treatment is continuously heated at a second temperature for a preset time; The first material shell after heating is placed at a third temperature.

19. The heat spreader fabrication process of claim 17, wherein, The preparation of the second material liquid comprises: The second material is heated and stirred, and a grain refiner is added to the second material in a solution state to form a second material water; The second material water with the grain refiner is subjected to degassing treatment to prepare the second material liquid.

20. The heat spreader fabrication process of claim 17, wherein, The polishing, cleaning, nickel-plating, and drying treatment of the inner core body and the inner core fitting welded together comprises: The inner core body and the inner core fitting welded together are sequentially polished, ultrasonic oil removal agent cleaned, pure water rinsed, surface nickel-plated, air-cut dehydrated, and tunnel dried; The cleaning and drying of the integrated metal composite blank after rough machining comprises: The integrated metal composite blank after rough machining is ultrasonic oil removal agent cleaned, pure water rinsed, air-cut dehydrated, and tunnel dried.

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