CN207824326U - A kind of profile-followed runner radiator based on stack of sheets connection - Google Patents

Abstract

The utility model discloses a conformal flow channel radiator based on sheet lamination connection; the part model of the flow channel radiator is designed and established in the three-dimensional model design software, and the part model to be prepared is imported into the slicing software according to the specified Thickness cutting and layering, generating the code files required for laser processing and importing them into the laser cutting system to cut into metal sheets, and then stacking and clamping each metal sheet in sequence according to the sequence of the flow channel, and then performing vacuum pressure heat diffusion with the intermediate layer Welding: use the laminated connection process of thin sheets to directly manufacture complex flow channel radiators with complex inner cavities. After the manufacturing and molding, the overall deformation of the parts is small, the continuity of the inner cavity is excellent, the product performance is consistent, and the long cycle is saved. , The high-cost mold opening process is conducive to the further optimized design of the runner radiator, so that the runner can be precisely fitted to the surface of complex curved parts, thereby improving the molding accuracy and heat dissipation performance.

Description

A Conformal Flow Channel Heat Sink Based on Sheet Lamination Connection

technical field

The utility model relates to the manufacture of complex conformal flow channel radiators, in particular to a conformal flow channel radiator based on sheet lamination connections.

Background technique

Diffusion welding with an intermediate layer refers to processing the intermediate layer material between the interfaces to be welded, pressing the workpieces to be welded together, and placing them in a vacuum or protective atmosphere. After a certain period of time under a certain temperature and pressure, the workpieces contact A solid-state connection method in which surface atoms are sufficiently diffused with each other to achieve a reliable connection.

Traditional runner radiators need to make multiple molds, drill holes in each mold, and manufacture simple runner radiators by welding and connecting each part. This kind of runner radiator generally only has straight or straight cross runners. , it is impossible to manufacture flow channels with spiral or more complex curved surfaces, resulting in average heat dissipation performance of the radiator and few available ways. However, the manufactured simple runner radiators cannot meet the actual manufacturing needs. Therefore, the efficient and complex runner radiators have only remained in the theoretical stage for a long time.

Contents of the invention

The purpose of the utility model is to overcome the shortcomings and deficiencies of the above-mentioned prior art, and to provide a heat sink with conformal flow channels based on laminar lamination connections, so as to realize rapid prototyping of heat sinks with complex flow channels, and save long periods and high costs. The manufacturing process, the preparation process of the utility model can make the inner cavity of the flow channel have good molding accuracy, and improve the degree of superimposition with complex curved surface parts.

The utility model is realized through the following technical solutions:

A preparation method of a conformal flow channel heat sink based on laminar lamination connection, comprising the following steps:

Step 1: Design and establish the part model of the runner radiator in the 3D model design software, save it as an STL file, and import it into the computer slicing software, and use the computer slicing software to cut and layer the part model to be prepared according to the specified thickness , to obtain the surface two-dimensional graphics profile required by each CAD model, extract the cross-sectional profile information of each layer through the computer, and generate the code file required for laser processing;

Step 2: Import the code file extracted in step 1 into the laser cutting system, the laser cutting system automatically generates the processing path, the computer controls the movement path of the laser cutting head, and quickly cuts the metal sheet with a thickness of 0.05-0.1mm to form multiple pieces with the same CAD model The thin-layer structure with the same cross-sectional shape, and at the same time remove the surface oxide on the surface of the obtained metal sheet to be welded by mechanical means, so that the roughness of the surface to be welded reaches 3.2 μm or more;

Step 3: Vacuum thermal diffusion welding; the metal sheets in step 2 are mechanically stacked and positioned according to the shape of the flow channel of the part model in the 3D model design software, and paste solder is coated between each layer of metal sheets, and then the fixture is used Carry out fixed clamping to ensure that the layers are in a tight fit state, forming a layer of metal flakes that are stacked and stacked in sequence according to the design sequence of the conformal flow channel, and placed in a vacuum glass tube filled with inert gas argon, and then put Put the vacuum glass tube into the high-temperature heat treatment furnace 5, carry out vacuum pressure thermal diffusion welding, and finally form a conformal flow channel radiator based on laminar lamination connection with the required complex flow channel shape;

Surface treatment is carried out on the conformal flow channel heat sink formed by thermal diffusion welding to make the surface meet the requirements of use.

The specified thickness cutting layer thickness in step 1 is 50-100 μm, which can avoid the step-like phenomenon of flow channel holes between adjacent layers.

The metal sheet in step 2 is 304 stainless steel, copper or spring steel sheet.

The solder paste in step 3 is brass solder.

The mechanical positioning method for the metal sheets described in Step 3 is to use positioning pins of two different sizes, M1 and M2, for positioning and fixing, so as to improve the positioning accuracy during the lamination process of the sheets.

The vacuum pressure thermal diffusion welding temperature in step 3 is kept constant at 1000°C;

The vacuum pressure thermal diffusion welding constant temperature heating time is 10h;

The vacuum degree of the vacuum environment is 50kPa, and the inert atmosphere is argon.

The surface treatment method described in step three includes mechanical polishing, wax penetration treatment, and nitric acid alcohol solution treatment.

A conformal flow channel heat sink based on laminar lamination connection. The conformal flow channel heat sink is formed by connecting and stacking a plurality of metal sheets with holes in sequence, and the holes on each adjacent layer of metal sheets are connected to each other. connected to form the overall shape of the radiator conformal flow channel.

The holes on each adjacent layer of metal sheets communicate with each other, which means that the axes of the holes on the adjacent layers of metal sheets deviate from each other or coincide; The overall setting shape of the runner depends on the section position where the shape is located.

The metal sheet is 304 stainless steel, copper or spring steel sheet with a thickness of 50-100 μm.

Compared with the prior art, the utility model has the following advantages and effects:

The connecting process of metal flakes of the utility model saves the mold production process with long period and high cost, and effectively saves manpower and cost.

The connection process of the metal flakes of the utility model can greatly improve the manufacturing precision of the parts with complex inner cavities, avoid the step phenomenon, make the parts better adapt to the complex working conditions, and the products produced by it have higher Forming accuracy provides more accurate experimental results for the design and optimization of metal parts.

The connection process of the metal flakes of the utility model utilizes the middle brass solder layer to connect the flakes, which reduces the welding temperature and time required for the experiment, and has better connection performance and improves the forming density of the parts; Vacuum diffusion welding under the same parameters can effectively improve the welding rate between the sheets, reduce the degree of warping and deformation between the sheets, and further improve the use effect of the parts.

After a long time of diffusion welding, the connection between the metal sheets is tight, the anti-deformation ability is greatly improved, and the service life of the product is improved.

The heat sink after diffusion welding can be in any shape, such as a complex spiral inner cavity. The flow channel of this structure has better heat dissipation performance than the traditional simple flow channel heat sink, and the service life is longer, which improves the performance of the heat sink. usage efficiency.

In the sheet connection process of the utility model, the conformal flow channel heat sink formed by metal sheet connection is bonded to the corresponding heat source parts with complex curved surfaces to improve heat conduction and heat dissipation performance, so that the heat dissipation efficiency is increased by more than 30%.

Description of drawings

Fig. 1 is the general flow chart of the preparation process of the utility model based on the lamination connection of the conformal channel heat sink.

Fig. 2 is a schematic diagram of the process of vacuum thermal diffusion welding treatment.

Figure 3 is a schematic diagram of the runner radiator model.

Fig. 4 is a schematic cross-sectional view of the runner radiator.

In the figure: metal sheet 1; laser cutting head 2; successively stacked metal sheet layers 3; fixture 4; high temperature heat treatment furnace 5.

Detailed ways

Below in conjunction with specific embodiment the utility model is described in further detail.

Example

The preparation method of the utility model based on the lamination-connected conformal flow channel radiator of the present invention can be realized through the following steps:

(1) Through the application analysis and effect prediction of complex flow channel radiators, the complex flow channel radiator model is established with computer 3D modeling software. The three-dimensional axial view of the model and the schematic diagram of the middle interface section are shown in Figure 3 and Figure 4 , save the model as a (*STL) format file.

(2) Import the STL file into the slicing software in the computer, cut and layer the radiator model with a thickness of 50-100 μm, form a multi-layer CAD model with different cross-sectional shapes, and use the computer to extract the contour information of each layer, Generate the code files needed to laser cut the sheet;

(3) Import the contour information of each layer into the laser processing system in order to generate the path selection for cutting metal. The laser cutting head cuts and shapes the (stainless steel) metal sheet with a layer thickness of 50-100 μm according to the processing path generated by the computer, and obtains Each layer has the same (solid) metal sheet layer with the same cross-sectional shape as the virtual layer. The cut multi-layer metal sheet layers are placed in sequence, and the surface to be welded of each layer of metal sheet is polished to remove processing burrs and surfaces. For oxides, use nitric acid alcohol solution to remove the grease on the surface, and use ultrasonic vibration to wash away the surface impurities, so that the contact surface roughness between the layers can reach more than 3.2 μm.

(4) Superimpose each layer of metal sheets in sequence, use two positioning pin holes of different sizes to judge the correct placement of the front and back of each layer of metal sheets, and after the complete stacking and sorting of all the metal sheets, place them on each layer of metal sheets. Apply an appropriate amount of paste brass solder between the layers of the sheet, and fix the position of each sheet with an M1 and an M2 positioning pin to ensure that each sheet metal layer has been placed correctly, and then use a clamp to clamp each layer of sheet metal , to ensure that the metal sheets are in a tight fit state, and the whole workpiece is placed in a vacuum glass tube filled with inert gas argon, and the vacuum glass tube is placed in a high-temperature heat treatment furnace. The process parameters of the vacuum thermal diffusion experiment, The welding temperature is 1000°C, the diffusion time is 10h, the vacuum is 50kPa, and the inert atmosphere is argon.

(5) Observe the connection of the metal sheets in the vacuum tube in the thermal diffusion furnace. The metal atoms between the adjacent metal layers are fully diffused, the pores and gaps between the layers disappear, and the bonding between the layers reaches the experimental level. It is required to take out the formed parts after long-term vacuum thermal diffusion welding from the high temperature thermal diffusion furnace, and perform stress relief annealing in an environment of 500 ° C to eliminate the internal stress of the experimental parts during the welding process, and then place them at room temperature Grinding and polishing the surface of the molded part to improve the surface roughness, so that the surface roughness of the part is below 5 μm, and finally form a complex conformal flow channel radiator 6 with good molding accuracy of 20-50 μm and high continuity of the inner cavity.

The utility model saves the time and cost of manufacturing multiple molds, uses the lamination connection process between metal sheets, and directly manufactures parts with high molding accuracy in terms of thickness and continuity between sheets. The precision of the conformal flow channel radiator manufactured by the layer connection method reaches 20-50 microns, and the surface roughness Ra is below 5 microns. There is basically no stepped phenomenon between the sheets, which is suitable for the manufacture of parts with complex inner cavities or surfaces; the process of manufacturing part models from metal sheets also shortens the design and structure optimization cycle of part models; The performance of the parts is more stable and the use effect is better; the inner cavity of the molded parts has flow channels corresponding to the parts on the curved surface, and the heat dissipation performance is better than that of radiators made by traditional processes, effectively improving the heat dissipation efficiency by more than 30%, and the service life Greatly improve.

As mentioned above, the utility model can be better realized.

The implementation of the present utility model is not limited by the above-mentioned examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present utility model should be equivalent replacement methods. Included within the protection scope of the present utility model.

Claims (3)

1. A conformal flow channel heat sink based on thin sheet lamination connection, characterized in that, the conformal flow channel heat sink is formed by connecting and stacking layers of metal sheets with holes successively, and each adjacent layer The holes on the metal sheets communicate with each other to form the overall shape of the heat sink conformal flow channel. 2. The conformal flow channel radiator based on laminar lamination connection according to claim 1, wherein the holes on each adjacent layer of metal sheets communicate with each other, which refers to the axes of the holes on adjacent layers of metal sheets Deviating from or coincident with each other; the axis deviation angle and coincidence angle of each adjacent hole is determined by the cross-sectional position of the hole in this layer relative to the overall set shape of the conformal flow channel. 3 . The heat sink with conformal flow channel based on laminar lamination connection according to claim 2 , wherein the metal sheet is 304 stainless steel, copper or spring steel sheet with a thickness of 50-100 μm. 4 .