Preparation method of near-net forming refrigerant runner plate

Abstract

The invention discloses a preparation method of a near-net forming refrigerant runner plate, which comprises the following steps: A, aiming at a refrigerant runner plate with a complex structure, designing a mold, a salt core structure and a combination mode of the mold and the salt core structure on the basis of a casting method; b, preparing an alloy raw material, a mold and a salt core, preheating and assembling the mold and the salt core, and casting a melt obtained by melting the alloy raw material to obtain a blank; and C, the blank is subjected to aftertreatment, and the refrigerant runner plate is obtained. According to the invention, the casting process of the runner plate is effectively improved, so that the near-net forming of the runner plate is realized, the machining workload is obviously reduced, the preparation process is shortened, and the cost is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of casting, and in particular relates to a method for preparing a near-net-shape refrigerant flow channel plate. Background Art

[0002] Compared with traditional fuel vehicles, the thermal management system of new energy vehicles is more complex, and its modularization and integration have become a major development trend. As a key integrated component of the automotive thermal management system, the refrigerant flow plate has become more complex in recent years, and its manufacturing difficulty has continued to increase. At the same time, the emergence of new refrigerant media such as CO2 has also continuously increased the pressure resistance requirements of the refrigerant flow plate.

[0003] At present, the refrigerant flow plate is generally prepared by the forging + brazing process, that is, the 6000 series aluminum alloy is forged, machined, and then assembled with the 3000 series or 6000 series plates by brazing. However, the production process of forgings is long, the machining workload is large, complex components cannot be prepared, the effective yield rate is low, and the product cost is high.

[0004] As a near-net-shape forming technology, casting can realize the forming of thin-walled, complex structure, and high-precision parts. Only a small amount of processing or even no processing is needed to complete the preparation of parts. However, the solidus temperature of the current mainstream aluminum-silicon cast aluminum alloy is generally below 580°C, which cannot meet the brazing temperature requirement of 590-610°C. To this end, in recent years, relevant manufacturers have successively developed a number of cast aluminum alloys that can be used for high-temperature brazing. However, in actual application, the casting process conditions of such alloys are harsh, the casting yield is not high, and the production cost is still high. In addition, whether it is the forging + brazing process route or the casting + brazing process route, aluminum alloy parts have undergone a high-temperature brazing process, which leads to a significant reduction in material properties. Therefore, the pressure resistance of the runner plate parts is low and cannot meet the requirements of new refrigerant media such as CO2. Therefore, for runner plates with complex internal structures, it is necessary to develop a low-cost preparation process.

[0005] Therefore, in view of the above technical problems, it is necessary to provide a method for preparing a near-net-shape refrigerant flow channel plate.

[0006] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0007] The object of the present invention is to provide a method for preparing a near-net-shape refrigerant flow channel plate.

[0008] In order to achieve the above object, a technical solution provided by a specific embodiment of the present invention is as follows:

[0009] A method for preparing a near-net-shape refrigerant flow channel plate comprises: A. designing a mold and a salt core structure and a combination thereof based on a casting method for a refrigerant flow channel plate having a complex structure; B. preparing alloy raw materials, a mold, and a salt core, preheating and combining the mold and the salt core, and then casting a melt obtained by melting the alloy raw materials to obtain a blank; C. post-processing the blank to obtain a refrigerant flow channel plate.

[0010] In one or more embodiments of the present invention, the salt core structure is used to form a complex internal flow channel structure of the refrigerant flow channel plate.

[0011] In one or more embodiments of the present invention, when the salt core is combined with the mold, the salt core is fixed by relying on the manifold valve seat and the preset hole position to ensure the accuracy of the salt core position and the stability of the placement. The manifold valve seat position and the preset hole position are adjusted according to the product characteristics and the casting method.

[0012] In one or more embodiments of the present invention, the salt core is a water-soluble salt core and meets the following requirements: melting temperature ≥ 680°C, bending strength ≥ 20 MPa.

[0013] In one or more embodiments of the present invention, the salt core is a high-strength water-soluble salt core reinforced with particles, fibers, whiskers, etc., or a high-strength water-soluble salt core composited with multiple inorganic salts.

[0014] In one or more embodiments of the present invention, the salt core is selected from: a NaCl-Na2CO3 water-soluble salt core reinforced with Al2O3 ceramic particles, and a NaCl-Na2CO3-BaCl2 multi-inorganic salt high-strength water-soluble salt core.

[0015] In one or more embodiments of the present invention, in the NaCl-Na2CO3 water-soluble salt core reinforced with Al2O3 ceramic particles: the dosage of Al2O3 ceramic particles is 10-20wt% of the total amount of the water-soluble salt.

[0016] In one or more embodiments of the present invention, the molar ratio of NaCl to Na2CO3 in the NaCl-Na2CO3 water-soluble salt core reinforced with Al2O3 ceramic particles is: (6-8): (2-4).

[0017] In one or more embodiments of the present invention, the molar ratio of NaCl-Na2CO3-BaCl2 in the highly water-soluble salt core of the multi-inorganic salt of NaCl-Na2CO3-BaCl2 is: (2-3.5): (6-8): (1.5-3).

[0018] In one or more embodiments of the present invention, the components of the melt and the mass percentage of each component are: Si: 3-12%, Mg: 0.1-3%, Cu: 0.005-4%, Zn: 0.005-5%, Fe: 0.05-0.5%, Mn: 0.005-1%, Ti: 0.02-0.3%, Sr: 0.005-0.06%, RE: 0.005-0.5%, and the rest are Al and unavoidable impurities; wherein RE is Ce or La.

[0019] In one or more embodiments of the present invention, the post-processing is selected from sawing, salt core removal, defect inspection, heat treatment, sealing, cleaning, and performance testing.

[0020] In one or more embodiments of the present invention, the mold and the salt core are preheated and combined as follows: the mold preheating temperature is set to 150-350°C, the prepared salt core is preheated at 150-350°C, and then the mold is opened to place the preheated salt core, and the mold is closed.

[0021] In one or more embodiments of the present invention, melt casting is: pouring a melt with a temperature of 670-780° C. into a mold after mold closing.

[0022] In one or more embodiments of the present invention, the salt core is removed by soaking in an aqueous solution or washing with high-pressure water. Preferably, the soaking is soaking in an aqueous solution at 40 to 90° C. for 2 to 30 minutes.

[0023] In one or more embodiments of the present invention, the heat treatment is at least selected from T6 heat treatment and T5 heat treatment. Preferably, the solution temperature of T6 treatment is 450-550°C, and the solution time is 180-480 min. Further preferably, the artificial aging temperature of T6 and T5 treatment is 120-220°C, and the artificial aging time is 120-360 min.

[0024] In one or more embodiments of the present invention, sealing includes welding specific areas such as salt core positioning holes to achieve sealing. Welding methods include laser welding, friction stir welding, argon arc welding, etc.

[0025] Compared with the prior art, the method for preparing the near-net-shape refrigerant flow channel plate of the present invention.

[0026] (1) Compared with the forging process, the salt core + casting method is used to prepare the complex structure flow plate, which realizes the near-net shape of the flow plate, significantly reduces the machining workload, shortens the preparation process, and reduces the cost;

[0027] (2) The near-net-shape forming of the complex flow channel structure inside the flow channel plate also eliminates the brazing process, shortens the preparation process, improves the yield rate, and reduces costs;

[0028] (3) Compared with brazed cast aluminum alloys, the developed Al-Si cast aluminum alloy has a mature casting process, excellent casting performance, fewer casting defects, and a higher yield rate;

[0029] (4) At the same time, the developed Al-Si cast aluminum alloy has excellent mechanical properties and avoids the brazing process, preventing the reduction of mechanical properties. Therefore, it can meet the pressure resistance requirements of the convection channel plate of new refrigerants such as CO2. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 It is a schematic diagram of a process of preparing a near-net-shape refrigerant flow channel plate in one embodiment of the present invention;

[0032] Figure 2 It is a schematic structural diagram of a refrigerant channel plate casting in one embodiment of the present invention;

[0033] Figure 3 In one embodiment of the present invention Figure 2 A schematic diagram of the structure of a salt core used for casting shown;

[0034] Figure 4 In one embodiment of the present invention Figure 2 and 3 Schematic diagram of the structure of the combined state of the casting and salt core shown. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0036] like Figure 1 As shown, a specific implementation process of the method for preparing the near-net-shape refrigerant flow channel plate of the present invention can be as follows:

[0037] S1 selects a casting method according to the structure and size characteristics of the flow channel plate, and designs the mold structure, salt core structure and salt core fixing method based on the characteristics of the selected casting method. After confirmation by simulation, the casting mold and salt core are made; then casting can be carried out.

[0038] S2 melts the alloy raw materials, and obtains a qualified target aluminum melt after composition adjustment, refining, degassing, and adding a refiner.

[0039] The preheating temperature of the S3 mold is set to 150-350°C. At the same time, the prepared salt core is preheated at 150-350°C. The mold is then opened to place the preheated salt core. After the mold is closed, a mold combination that can realize complex internal flow channels is formed.

[0040] S4: pouring aluminum melt at a temperature of 670-780° C. into the above-mentioned mold assembly for casting to obtain a casting blank.

[0041] S5 uses sawing method to remove auxiliary pouring system including slag bag, runner, material handle, etc.

[0042] S6: Soak the blank in an aqueous solution or use high-pressure water to clean it so that the salt core is completely removed. On this basis, other measures can be considered to further clean the inner flow channel according to product requirements.

[0043] S7 conducted appearance inspection and X-ray inspection on the above-mentioned blanks and found no obvious shrinkage or hole defects.

[0044] S8 performs necessary heat treatment or no heat treatment according to the performance requirements of the manifold.

[0045] S9 performs machining according to the dimension requirements of the runner plate products and performs dimension inspection to ensure that the dimensions meet the requirements.

[0046] S10 cleans the machined flow channel plate to ensure cleanliness.

[0047] S11 welds specific areas such as the salt core positioning holes according to the structural characteristics of the flow channel plate to achieve sealing.

[0048] S12 product performance test: helium detection for leak detection, hydraulic oil or water for burst pressure test.

[0049] Furthermore, the salt core in step (S1) is a high-strength water-soluble salt core reinforced with particles, fibers, whiskers, etc., or a high-strength water-soluble salt core composited with multiple inorganic salts;

[0050] Further, the melting temperature of the salt core in step (S1) is ≥680°C and the flexural strength is ≥20MPa;

[0051] Further, the components of the aluminum melt in step (S2) and the mass percentage of each component are: Si: 3-12%, Mg: 0.1-3%, Cu: 0.005-4%, Zn: 0.005-5%, Fe: 0.05-0.5%, Mn: 0.005-1%, Ti: 0.02-0.3%, Sr: 0.005-0.06%, RE: 0.005-0.5%, and the rest are Al and unavoidable impurities; wherein RE is one or a combination of Ce or La;

[0052] Furthermore, when placing the salt core in step (S3), the salt core is fixed by relying on the valve seat of the flow channel plate and the preset hole position to ensure the accuracy of the salt core position and the stability of the placement;

[0053] Further, the number of salt cores placed in step (S3) is 1 or more;

[0054] Furthermore, the casting method in step (S4) includes low pressure casting, high pressure casting, squeeze casting, gravity casting, etc.;

[0055] Furthermore, the soaking process in step (S6) is to soak the blank in a 40-90° C. aqueous solution for 2-30 min;

[0056] Further, the heat treatment in step (S8) includes T6, T5, etc., wherein the solution temperature of T6 treatment is 450-550°C, the solution time is 180-480min, the artificial aging temperature of T6 and T5 treatment is 120-220°C, and the artificial aging time is 120-360min;

[0057] Furthermore, the cleaning method in step (S10) is ultrasonic cleaning or high-pressure cleaning, and the cleaning time is 2 to 30 minutes;

[0058] Furthermore, the welding method in step (S11) includes laser welding, friction stir welding, argon arc welding, etc.

[0059] The sealing of the final parts must meet the conditions of room temperature (23±2℃) and 18.7MPa pressure, with a leakage of less than or equal to 0.2g / a. The burst test should meet the burst pressure>34MPa.

[0060] Using the above method, we can achieve Figure 2-4 The casting product is prepared as shown. Figure 2 The casting 1 shown includes a main body having three large-angle (approximately 90-degree) bends, and a valve seat 11 arranged at one end and the second bend from the left, while the other end is arranged as a positioning hole 12. The slender curved main body has a hollow flow channel along the entire extension direction for the medium to flow therein.

[0061] In a specific embodiment, the casting may be performed using Figure 3 The salt core 2 shown in the figure has a fixing column 21 formed on the main body of the salt core. Figure 2 The fixed column 21 can be arranged in conjunction with the valve seat 11 to make full use of the existing casting hole structure. The prepared salt core 2 is then matched with the mold, and the salt core 2 is fixed in the mold and the mold is closed to start the casting operation. After the casting is completed and cooled, the mold is demolded to obtain Figure 3 The combination of the casting 1 and the salt core 2 shown can be washed or soaked to remove the salt core 2 and then be subjected to subsequent post-processing.

[0062] Example 1

[0063] See also Figure 1 The main process of the present invention includes the design and preparation of the mold and the salt core, casting, sawing, salt core removal, machining, cleaning, defect inspection, heat treatment, sealing, testing and other links, and finally the finished parts of the refrigerant flow channel plate are obtained.

[0064] Combination Figure 2-4 In this embodiment, a near-net-shape refrigerant flow channel plate is prepared by a salt core + extrusion casting process. The specific preparation method steps are as follows:

[0065] S1 According to the structure and performance requirements of the runner plate, the indirect extrusion casting process is selected for preparation; Figure 1-4 As shown, in combination with the characteristics of the parts, a fixing column is set at the valve seat of the flow channel plate, and a fixing column is set at the end or middle opening of the casting flow channel, and its height is higher than the casting, and the protruding part is used to fix the salt core on the mold to prevent the salt core from falling or position deviation; the salt core used in this embodiment is a 10wt.% Al2O3 ceramic particle (particle size 10μm, the same below) doped enhanced NaCl-Na2CO3 (molar ratio: 7:3) water-soluble salt core, the melting temperature is ≥720℃, and the bending strength is ≥25MPa;

[0066] S2 melts the prepared alloy raw material, and after the alloy composition is adjusted, obtains an aluminum melt composed of the following components and component contents (in mass percentage): Si: 7.02%, Mg: 0.32%, Cu: 0.21%, Zn: 0.03%, Fe: 0.09%, Mn: 0.008%, Ti: 0.08%, Ce: 0.05%, and the rest is Al and inevitable impurities; then adds 0.02wt.% of Al-10Sr for modification treatment, and refines and degasses at 730℃ for 25min, adds 0.5wt.% of grain refiner in this refining and degassing process, and after the degassing is completed, stands for 20min and then slags are removed to obtain a qualified target aluminum melt;

[0067] Before pouring, S3 sets the mold preheating temperature to 200℃ and preheats the salt core at 200℃. After preheating, spray the release agent and place three salt cores of different shapes. After closing the mold, a mold combination that can realize complex internal flow channels is formed. One of the salt cores is Figure 3 As shown, the salt core relies on three fixing columns to achieve positioning and fixation, and the remaining salt cores are placed in a similar manner;

[0068] S4 then performs extrusion casting, first slowly pressing 700°C aluminum melt into the above mold assembly, and after filling, extrusion casting is performed at a pressure of 100 bar and the pressure is maintained for 25 seconds, followed by cooling and taking out the casting blank;

[0069] S5 After removing the auxiliary pouring system including the slag bag, runner, material handle, etc. by using a vertical saw, the blank is immersed in an aqueous solution at 80°C for 10 minutes to completely dissolve the salt core in the aqueous solution;

[0070] S6 then conducted a visual inspection and X-ray inspection on the above-mentioned blank and found no obvious casting defects on the surface or inside;

[0071] S7 The above-mentioned blank is not subjected to heat treatment;

[0072] S8 performs machining according to the flow channel plate size requirements to make the product size meet the drawing requirements. At the same time, specific areas such as the salt core positioning holes on the casting are machined to form circular step holes for welding. The machined flow channel plate is then ultrasonically cleaned using an ultrasonic cleaning machine. The ultrasonic temperature is set to 60°C, the ultrasonic cleaning is for 2 minutes, and then dried at 70°C.

[0073] S9 presses a 6061 disc of suitable diameter into the salt core positioning hole after machining, and performs laser welding along the circumference of the disc to completely seal the hole;

[0074] S10 conducted performance tests on the above products. Helium was used for leak detection at room temperature, with a test pressure of 18.7 MPa. The test result showed that the leakage was 0.07 g / year. Water was used for burst pressure test. After testing, when the pressure was greater than 34 MPa, the product did not burst.

[0075] Example 2

[0076] The method is basically the same as Example 1, except that the alloy composition and heat treatment system are different.

[0077] In this embodiment, an aluminum melt having the following components and component contents (in percentage by mass) is obtained: Si: 4.52%, Mg: 0.45%, Cu: 0.11%, Zn: 0.01%, Fe: 0.12%, Mn: 0.05%, Ti: 0.10%, Ce+La: 0.11%, and the rest being Al and unavoidable impurities.

[0078] After the casting obtained in this embodiment is confirmed to be qualified by X-ray, T6 heat treatment is performed, wherein the solid solution temperature of T6 treatment is 530°C, the solid solution time is 180min, the artificial aging temperature is 170°C, and the artificial aging time is 240min;

[0079] The product performance test results obtained in this embodiment are as follows: at room temperature, helium detection was used for leakage detection, the test pressure was 18.7MPa, and the test result was a leakage of 0.04g / year; water was used for bursting pressure test, and after testing, when the pressure was greater than 34MPa, the product did not explode.

[0080] Example 3

[0081] It is basically the same as Example 1, with the only difference being that the salt core is a NaCl-Na2CO3 water-soluble salt core reinforced with Al2O3 ceramic particles, wherein the dosage of Al2O3 ceramic particles is 10wt% of the total amount of water-soluble salt, and the molar ratio of NaCl to Na2CO3 is 6:4.

[0082] The product performance test results obtained in this embodiment are as follows: at room temperature, helium detection was used for leakage detection, the test pressure was 18.7MPa, and the test result was a leakage of 0.06g / year; water was used for bursting pressure test, and after testing, when the pressure was greater than 34MPa, the product did not explode.

[0083] Example 4

[0084] It is basically the same as Example 1, with the only difference being that the salt core is a NaCl-Na2CO3 water-soluble salt core reinforced with Al2O3 ceramic particles, wherein the dosage of Al2O3 ceramic particles is 10wt% of the total amount of water-soluble salt, and the molar ratio of NaCl to Na2CO3 is 8:2.

[0085] The product performance test results obtained in this embodiment are as follows: at room temperature, helium detection was used for leakage detection, the test pressure was 18.7MPa, and the test result was a leakage of 0.05g / year; water was used for bursting pressure test, and after testing, when the pressure was greater than 34MPa, the product did not explode.

[0086] Example 5

[0087] It is basically the same as Example 1, with the only difference being that the salt core is a NaCl-Na2CO3 water-soluble salt core reinforced with Al2O3 ceramic particles, wherein the dosage of Al2O3 ceramic particles is 20wt% of the total amount of water-soluble salt, and the molar ratio of NaCl to Na2CO3 is 6:4.

[0088] The product performance test results obtained in this embodiment are as follows: at room temperature, helium detection was used for leakage detection, the test pressure was 18.7MPa, and the test result was a leakage of 0.03g / year; water was used for bursting pressure test, and after testing, when the pressure was greater than 34MPa, the product did not explode.

[0089] Example 6

[0090] It is basically the same as Example 1, with the only difference being that the salt core is a NaCl-Na2CO3 water-soluble salt core reinforced with Al2O3 ceramic particles, wherein the dosage of Al2O3 ceramic particles is 20wt% of the total amount of water-soluble salt, and the molar ratio of NaCl to Na2CO3 is 8:2.

[0091] The product performance test results obtained in this embodiment are as follows: at room temperature, helium detection was used for leakage detection, the test pressure was 18.7MPa, and the test result was a leakage of 0.04g / year; water was used for bursting pressure test, and after testing, when the pressure was greater than 34MPa, the product did not explode.

[0092] Example 7

[0093] It is basically the same as Example 1, and the only difference is: the salt core type and the casting method are different.

[0094] The salt core used in this embodiment is a multi-inorganic salt high-strength water-soluble salt core of NaCl-Na2CO3-BaCl2 (molar ratio: 2:6:1.5), with a melting temperature of ≥730°C and a flexural strength of ≥21MPa;

[0095] The casting method used in this embodiment is low-pressure casting. Before casting, the preheated salt core is placed horizontally in the designed hole position on the mold, and then the mold is closed for low-pressure casting. First, the 715°C aluminum melt is slowly raised to the above mold assembly. After filling, it is cast at a pressure of 400mBar and the pressure is maintained for 60s. Then it is cooled and the casting blank is taken out;

[0096] The above products were tested for performance. Helium was used for leakage detection at room temperature, and the test pressure was 18.7MPa. The test result showed that the leakage was 0.05g / year. Water was used for burst pressure test. After testing, when the pressure was greater than 34MPa, the product did not explode.

[0097] Example 8

[0098] It is basically the same as Example 7, the only difference being that the salt core is a highly water-soluble salt core of a polynary inorganic salt of NaCl-Na2CO3-BaCl2 (molar ratio: 3.5:8:3).

[0099] The above products were tested for performance. Helium was used for leakage detection at room temperature, the test pressure was 18.7MPa, and the test result showed that the leakage was 0.04g / year. Water was used for burst pressure test, and the product did not burst when the pressure was greater than 34MPa.

[0100] Example 9

[0101] It is basically the same as Example 7, the only difference being that the salt core is a highly water-soluble polynary inorganic salt core of NaCl-Na2CO3-BaCl2 (molar ratio: 3:7:2).

[0102] The above products were tested for performance. Helium was used for leakage detection at room temperature, and the test pressure was 18.7MPa. The test result showed that the leakage was 0.03g / year. Water was used for burst pressure test. After testing, when the pressure was greater than 34MPa, the product did not explode.

[0103] Example 10

[0104] The method is basically the same as Example 1, except that the mold preheating temperature is set to 150° C., and the prepared salt core is preheated at 150° C. Aluminum melt at a temperature of 670° C. is poured into the above mold assembly.

[0105] The product performance test results obtained in this embodiment are as follows: at room temperature, helium detection was used for leakage detection, the test pressure was 18.7MPa, and the test result was a leakage of 0.07g / year; water was used for bursting pressure test, and after testing, when the pressure was greater than 34MPa, the product did not explode.

[0106] Embodiment 11

[0107] The method is basically the same as Example 1, except that the mold preheating temperature is set at 350° C., and the prepared salt core is preheated at 350° C. Aluminum melt at 780° C. is poured into the mold assembly.

[0108] The product performance test results obtained in this embodiment are as follows: at room temperature, helium detection was used for leakage detection, the test pressure was 18.7MPa, and the test result was a leakage of 0.03g / year; water was used for bursting pressure test, and after testing, when the pressure was greater than 34MPa, the product did not explode.

[0109] Example 12

[0110] The method is basically the same as Example 1, with the only difference being that after the auxiliary pouring system including the slag bag, runner, material handle, etc. is removed by using a vertical saw, the blank is immersed in a 40° C. aqueous solution for 30 minutes.

[0111] The product performance test results obtained in this embodiment are as follows: at room temperature, helium detection was used for leakage detection, the test pressure was 18.7MPa, and the test result was a leakage of 0.05g / year; water was used for bursting pressure test, and after testing, when the pressure was greater than 34MPa, the product did not explode.

[0112] Embodiment 13

[0113] The method is basically the same as Example 1, with the only difference being that after removing the auxiliary pouring system including the slag bag, runner, material handle, etc. by using a vertical saw, the blank is immersed in a 90° C. aqueous solution for 2 minutes.

[0114] The product performance test results obtained in this embodiment are as follows: at room temperature, helium detection was used for leakage detection, the test pressure was 18.7MPa, and the test result was a leakage of 0.04g / year; water was used for bursting pressure test, and after testing, when the pressure was greater than 34MPa, the product did not explode.

[0115] Embodiment 14

[0116] The method is basically the same as Example 2, except that the solution temperature of T6 treatment is 450° C., the solution time is 280 min, the artificial aging temperature is 120° C., and the artificial aging time is 120 min.

[0117] The product performance test results obtained in this embodiment are as follows: at room temperature, helium detection was used for leakage detection, the test pressure was 18.7MPa, and the test result was a leakage of 0.03g / year; water was used for bursting pressure test, and after testing, when the pressure was greater than 34MPa, the product did not explode.

[0118] Embodiment 15

[0119] The method is basically the same as Example 2, except that the solution temperature of T6 treatment is 550° C., the solution time is 480 min, the artificial aging temperature is 220° C., and the artificial aging time is 360 min.

[0120] The product performance test results obtained in this embodiment are as follows: at room temperature, helium detection was used for leakage detection, the test pressure was 18.7MPa, and the test result was a leakage of 0.02g / year; water was used for bursting pressure test, and after testing, when the pressure was greater than 34MPa, the product did not explode.

[0121] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0122] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A method for preparing a near-net-shape refrigerant flow channel plate, comprising: A. For the refrigerant flow plate with complex structure, based on the casting method, design the mold and salt core structure and their combination; B. Prepare alloy raw materials, molds, and salt cores, preheat and assemble the molds and salt cores, and then cast the melt obtained by melting the alloy raw materials to obtain a blank; C. Post-process the blank to obtain the runner plate.

2. The method for preparing a near net shape refrigerant flow channel plate according to claim 1, characterized in that: The salt core is a water-soluble salt core and meets the following requirements: melting temperature ≥ 680° C., bending strength ≥ 20 MPa.

3. The method for preparing a near net shape refrigerant flow channel plate according to claim 2, characterized in that: The salt core is a high-strength water-soluble salt core reinforced by particles, fibers, whiskers, etc., or a high-strength water-soluble salt core composited by multiple inorganic salts.

4. The method for preparing a near net shape refrigerant flow channel plate according to claim 3, characterized in that: The components of the melt and the mass percentage of each component are: Si: 3-12%, Mg: 0.1-3%, Cu: 0.005-4%, Zn: 0.005-5%, Fe: 0.05-0.5%, Mn: 0.005-1%, Ti: 0.02-0.3%, Sr: 0.005-0.06%, RE: 0.005-0.5%, and the rest are Al and unavoidable impurities; wherein RE is one or a combination of Ce or La.

5. The method for preparing a near net shape refrigerant flow channel plate according to claim 4, characterized in that: The post-processing is selected from sawing, salt core removal, defect inspection, heat treatment, sealing, cleaning, and performance testing.

6. The method for preparing a near net shape refrigerant flow channel plate according to claim 1, characterized in that: The preheating and assembling of the mold and the salt core comprises: setting the mold preheating temperature to 150-350° C., preheating the prepared salt core at 150-350° C., then opening the mold to place the preheated salt core, and closing the mold.

7. The method for preparing a near net shape refrigerant flow channel plate according to claim 1, characterized in that: The melt casting is as follows: pouring a melt with a temperature of 670-780° C. into a mold after mold closing.

8. The method for preparing a near net shape refrigerant flow channel plate according to claim 5, characterized in that: The salt core is removed by soaking in an aqueous solution or washing with high-pressure water.

9. The method for preparing a near net shape refrigerant flow channel plate according to claim 5, characterized in that: The heat treatment is at least selected from T6 heat treatment and T5 heat treatment.

10. The method for preparing a near net shape refrigerant flow channel plate according to claim 5, characterized in that: The sealing includes welding specific areas such as the salt core positioning holes to achieve sealing.

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