Aluminum bronze refining method for butterfly valve plate
By optimizing the refining parameters of aluminum bronze using the JC model and additives, and combining multi-directional forging and annealing, the problem of excessive rheological stress during the refining process of aluminum bronze was solved, thereby improving the strength and plasticity of aluminum bronze and enhancing refining efficiency and quality.
Patent Information
- Application Number
- CN202510742029.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-05
- Publication Date
- 2025-10-31
AI Technical Summary
The existing aluminum bronze refining process cannot adjust the rheological stress, which leads to difficulties in forming, affects the surface quality and dimensional accuracy of aluminum bronze products, and reduces the refining quality.
By predicting rheological stress using the JC model, adjusting refining parameters, adding aluminum-nickel, iron, silicon, and tin, using a graphite rotor and high-purity argon gas rotary blowing to reduce molten viscosity, and combining water-cooled copper mold casting and multi-directional forging, annealing treatment refines equiaxed crystals, thus optimizing the rheological stress and strength of aluminum bronze.
It effectively reduces rheological stress, improves the strength and plasticity of aluminum bronze, enhances refining efficiency, reduces scrap rate, and ensures the quality and dimensional accuracy of aluminum bronze products.
Smart Images
Figure CN120866675A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of alloy refining technology, specifically a method for refining aluminum bronze for butterfly valve plates. Background Technology
[0002] A butterfly valve, also known as a flap valve, is a simple regulating valve that can be used for the on / off control of low-pressure pipeline media. A butterfly valve is a type of valve in which the closing element (valve disc or butterfly plate) is a disc that rotates around the valve shaft to achieve opening and closing.
[0003] Butterfly valve plates are generally made of stainless steel and alloys. Alloy materials include aluminum bronze, a copper-based alloy with aluminum as the main alloying element. It contains iron and manganese and is a high-strength, heat-resistant bronze. The aluminum content is generally no more than 11.5%. Aluminum bronze can be heat-treated to strengthen it, and its strength is higher than that of tin bronze. It also has better resistance to high-temperature oxidation. Aluminum bronze has many excellent properties, including high strength, hardness, and wear resistance. It is often used to manufacture gear blanks, threaded parts, and other components. Aluminum bronze also has good corrosion resistance, so it can be used to manufacture corrosion-resistant parts such as propellers and valves.
[0004] The aluminum bronze used in most existing butterfly valve plates is generally produced by adding boron-iron alloy to aluminum bronze raw materials for modification treatment to obtain aluminum bronze molten liquid. This molten aluminum bronze is then poured into a casting cavity with a chilling material to obtain an aluminum bronze casting. After the aluminum bronze cools to a set temperature, the casting cavity is opened for further cooling treatment to obtain the final aluminum bronze alloy, which is used to manufacture butterfly valve plates. By combining modification treatment, chilling, and rapid cooling, the grain size is further reduced, thereby improving the strength and toughness of the aluminum bronze alloy.
[0005] However, in the above-mentioned aluminum bronze refining process, it is impossible to adjust the rheological stress during the refining process, resulting in excessively high rheological stress. This makes it more difficult to form aluminum bronze during the refining process and makes aluminum bronze processing more inconvenient. Consequently, the refining precision of aluminum bronze is reduced, affecting the surface quality and dimensional accuracy of aluminum bronze products, and thus affecting the final refining quality of aluminum bronze.
[0006] Therefore, the present invention provides a method for refining aluminum bronze for butterfly valve plates to solve the above-mentioned problems. Summary of the Invention
[0007] This invention provides a method for refining aluminum bronze for butterfly valve plates, aiming to solve the problems mentioned in the background art.
[0008] To achieve the above objectives, the present invention provides the following technical solution:
[0009] A method for refining aluminum bronze for butterfly valve plates includes the following specific steps:
[0010] S1: Take a certain amount of electrolytic copper and pre-treat the surface of the electrolytic copper to remove the surface oxide scale. At the same time, take aluminum material and preheat it. Also take the prepared aluminum nickel to complete the material preparation. At the same time, use the JC model to predict the rheological stress of aluminum bronze and adjust the aluminum bronze refining parameters.
[0011] S2: Add electrolytic copper to the induction furnace and heat it until the electrolytic copper is completely melted and the melt is uniform. Then, the temperature inside the induction furnace is increased and preheated aluminum material is added. After melting the aluminum material, aluminum nickel, iron, silicon and tin are added inside the induction furnace to reduce the viscosity of the melt inside the induction furnace and the high temperature brittleness, and further reduce the rheological stress of the aluminum bronze raw material.
[0012] S3: Based on the graphite rotor driving the high-purity argon gas to rotate and spray the molten liquid inside the induction furnace, and the preparation of refining agent and covering agent to be added to the molten liquid, the mixed molten liquid is refined, and the refined mixed molten liquid is cast based on the water-cooled copper mold to obtain fine equiaxed crystals.
[0013] S4: Based on forging equipment and heating system, fine equiaxed crystals are forged and then annealed to obtain further refined fine equiaxed crystals. Based on multi-directional forging, the fine equiaxed crystals are forged and then annealed to obtain the final refined aluminum bronze.
[0014] As a preferred technical solution of this application, the preheating temperature of the aluminum material is controlled at 150-200℃, the induction furnace is equipped with argon gas to form a protective cover, the temperature inside the induction furnace is controlled at 1200℃ after the electrolytic copper is completely melted and the melt reaches uniformity, and the temperature inside the induction furnace is controlled at 1080-1220℃ after aluminum material is added inside the induction furnace.
[0015] As a preferred technical solution of this application, the aluminum content inside the induction furnace is 8%, the silicon and tin content is 0.3% and 0.2% respectively, the silicon is used to form a low melting point eutectic, the tin is used to adsorb at the grain boundaries to suppress high temperature brittleness, and the aluminum, nickel and iron content is 1.7% and 1% respectively, which are used to refine the intermetallic compound strengthening phase and improve the thermoplasticity of the melt.
[0016] As a preferred technical solution of this application, the purity of the high-purity argon gas is maintained above 99.999%, the rpm of the graphite rotor is controlled at 500, the flow rate of the high-purity argon gas is controlled at 1.5 L / min·kg, the blowing time is 8 min, the temperature of the molten liquid is controlled at around 1200℃ during blowing, and the covering agent is a mixture of calcium fluoride and glass slag, with a ratio of calcium fluoride to glass slag of 1:1.
[0017] As a preferred technical solution of this application, the refining agent is prepared by mixing sodium carbonate, sodium hexafluoroaluminate and sodium chloride, wherein the ratio of sodium carbonate, sodium hexafluoroaluminate and sodium chloride is 4:3:3, the amount of refining agent added is 0.5%, the refining agent is dehydrated before being added to the melt, and is added to the melt in several batches with stirring at 3-minute intervals each time, and the melt is allowed to stand for 10 minutes after spraying.
[0018] As a preferred technical solution of this application, the JC model is used to predict the rheological stress σ of aluminum bronze. The JC model is described as follows:
[0019]
[0020] Where A is the stress at ε = 0, i.e., the initial stress, B is the strain hardening coefficient, n is the strain hardening exponent, and ε is the true strain. Used to describe the strain hardening behavior of aluminum bronze under quasi-static deformation;
[0021] Where C is the strain rate sensitivity coefficient. This is a normalized strain rate used to express the sensitivity of aluminum bronze to strain rate.
[0022] As a preferred technical solution of this application, T is the normalized temperature, and m is the temperature softening index, used to reflect the softening effect of rheological stress at high temperatures. The higher the temperature, the greater the softening effect of T. * As the value approaches 1, the rheological stress of aluminum bronze decreases accordingly. Based on the JC model, the change in rheological stress of preheated aluminum bronze during the refining process is analyzed. The parameters in the refining of aluminum bronze are optimized to further optimize the rheological stress of aluminum bronze.
[0023] As a preferred technical solution of this application, the forging equipment controls the pressure at 100MPa and the forging time at 2 / h when forging fine equiaxed crystals. The heating system controls the temperature at 900℃ to heat the fine equiaxed crystals. The annealing temperature of the fine equiaxed crystals is controlled at 800℃ and the time is maintained at 4 / h to adjust the distribution state of the intermetallic compound strengthening phase.
[0024] As a preferred technical solution of this application, the multi-directional forging includes a first forging, a second forging, and a third forging. The first forging, the second forging, and the third forging are used to roughen, deform, and refine the aluminum bronze raw material. After roughing, the aluminum bronze raw material needs to be returned to the furnace for 15 minutes of heat preservation. During deformation, the temperature is maintained above 680°C. The first forging, the second forging, and the third forging are based on box-type resistance furnace heating.
[0025] As a preferred technical solution of this application, based on the aluminum bronze after the first, second and third multi-directional forging, annealing is used to further enhance the performance of the aluminum bronze. The annealing is to place the aluminum bronze in an annealing furnace, control the temperature at 600℃, hold it at that temperature for 2 hours, and then take out the aluminum bronze to obtain the final aluminum bronze.
[0026] After adopting the above technical solution, the beneficial effects of the present invention are:
[0027] The addition of aluminum-nickel and iron, along with the reduction of aluminum content, not only can the viscosity of the melt be reduced and the plasticity improved, but high-temperature brittleness can also be suppressed. This can also reduce the formation of hard and brittle aluminum bronze raw materials, increase the weight of the solid solution, further reduce the viscosity of the melt, and improve the fluidity of the melt. Furthermore, the appropriate addition of iron and aluminum-nickel can reduce the rheological stress during the refining process of aluminum bronze. At the same time, aluminum-nickel can refine the intermetallic compound strengthening phase and improve the thermoplasticity of aluminum bronze. The annealing treatment of fine equiaxed crystals can enhance the strength of the fine equiaxed crystals, thereby further improving the strength of the refined aluminum bronze.
[0028] Based on the cooperation of forging equipment and heating system, fine equiaxed crystals are further forged to reduce their grain size, thereby improving the strength of the subsequently forged aluminum bronze. Through multi-directional forging, the aluminum bronze raw material is recycled and forged multiple times, causing deformation of the aluminum bronze. After forging, annealing is performed to further improve the plasticity of the aluminum bronze. This not only makes the refining of aluminum bronze more convenient and improves the efficiency of aluminum bronze refining, but also, based on reducing the grain size of fine equiaxed crystals and enhancing the plasticity of aluminum bronze, further adjusts the rheological stress in the aluminum bronze refining process, thus not only ensuring the plasticity of aluminum bronze, but also enhancing the strength of the refined aluminum bronze.
[0029] Based on the JC model, the strain hardening behavior of aluminum bronze raw materials under quasi-static deformation, their sensitivity to strain rate, and the softening effect of rheological stress at high temperatures are used to calculate the rheological stress of aluminum bronze raw materials during the refining process. This allows for the prediction of the rheological behavior of aluminum bronze during refining, optimization of parameters in the aluminum bronze refining process, and thus not only improvement of the purity and performance of aluminum bronze after refining, but also reduction of the scrap rate in aluminum bronze refining, avoiding waste of aluminum bronze raw materials. Attached Figure Description
[0030] Figure 1 This is a flowchart of a method for refining aluminum bronze for butterfly valve plates.
[0031] Figure 2 This is a graph showing the experimental data of rheological stress in an aluminum bronze refining method for butterfly valve plates.
[0032] Figure 3Line graph showing experimental data on rheological stress in an aluminum bronze refining method for butterfly valve plates;
[0033] Figure 4 A graph showing the strength test data of an aluminum bronze refining method for butterfly valve plates;
[0034] Figure 5 This is a line graph showing the strength test data of an aluminum bronze refining method used for butterfly valve plates. Detailed Implementation
[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0036] This invention provides a method for refining aluminum bronze for butterfly valve plates, referring to... Figures 1-4 The present invention provides four embodiments:
[0037] Example 1:
[0038] The method for refining aluminum bronze for butterfly valve plates includes the following specific steps:
[0039] S1: Take a certain amount of electrolytic copper and pre-treat the surface of the electrolytic copper to remove the surface oxide scale. At the same time, take aluminum material and preheat it. Also take the prepared aluminum nickel to complete the material preparation. At the same time, use the JC model to predict the rheological stress of aluminum bronze and adjust the aluminum bronze refining parameters.
[0040] S2: Add electrolytic copper to the induction furnace and heat it until the electrolytic copper is completely melted and the melt is uniform. Then, the temperature inside the induction furnace is increased and preheated aluminum material is added. After melting the aluminum material, aluminum nickel, iron, silicon and tin are added inside the induction furnace to reduce the viscosity of the melt inside the induction furnace and the high temperature brittleness, and further reduce the rheological stress of the aluminum bronze raw material.
[0041] S3: Based on the graphite rotor driving the high-purity argon gas to rotate and spray the molten liquid inside the induction furnace, and the preparation of refining agent and covering agent to be added to the molten liquid, the mixed molten liquid is refined, and the refined mixed molten liquid is cast based on the water-cooled copper mold to obtain fine equiaxed crystals.
[0042] S4: Based on forging equipment and heating system, fine equiaxed crystals are forged and then annealed to obtain further refined fine equiaxed crystals. Based on multi-directional forging, the fine equiaxed crystals are forged and then annealed to obtain the final refined aluminum bronze.
[0043] Furthermore, the preheating temperature of the aluminum material is controlled at 150-200℃, and argon gas is installed inside the induction furnace to form a protective cover to protect the inside of the induction furnace. After the electrolytic copper is completely melted and the melt reaches uniformity, the temperature inside the induction furnace is controlled at 1200℃. After aluminum material is added inside the induction furnace, the temperature is controlled at 1080-1220℃ to avoid the aluminum material being damaged due to excessively high temperature inside the induction furnace, which would affect the subsequent refining of aluminum bronze.
[0044] Furthermore, the aluminum content inside the induction furnace is 8%, which reduces the aluminum content in the aluminum bronze, reduces the formation of hard and brittle aluminum bronze raw materials, increases the weight of the solid solution, further reduces the viscosity of the melt, and improves the fluidity of the melt. The silicon and tin contents are 0.3% and 0.2%, respectively. Silicon is used to form a low-melting-point eutectic, and tin is used to adsorb at grain boundaries to suppress high-temperature brittleness. The aluminum-nickel and iron contents are 1.7% and 1%, respectively, which are used to refine the intermetallic compound strengthening phase and improve the thermoplasticity of the melt. By adding aluminum-nickel and iron, not only can the viscosity of the melt be reduced and the plasticity improved, but high-temperature brittleness can also be suppressed.
[0045] Furthermore, the purity of high-purity argon gas is maintained above 99.999%, the rpm of the graphite rotor is controlled at 500, and the flow rate of high-purity argon gas is controlled at 1.5 L / min·kg. Through spraying, the bubbles inside the aluminum bronze raw material float to the surface, removing impurities from the aluminum bronze raw material. The spraying time is 8 minutes, and the spraying time limit ensures that the inclusions float to the surface, making the melt purer. During the spraying, the temperature of the melt is controlled at around 1200℃. The covering agent is a mixture of calcium fluoride and glass slag, with a ratio of calcium fluoride to glass slag of 1:1. The addition of the covering agent prevents the oxidation of the aluminum bronze melt.
[0046] Furthermore, the refining agent is prepared by mixing sodium carbonate, sodium hexafluoroaluminate, and sodium chloride in a ratio of 4:3:3. The amount of refining agent added is 0.5%. The refining agent is dehydrated before being added to the melt and is added to the melt in several batches with stirring every 3 minutes. After blowing, the melt is allowed to stand for 10 minutes to further improve the purity and performance of the aluminum bronze, making the aluminum bronze refined by this method suitable for the manufacture of butterfly valve plates.
[0047] Example 2: Based on Example 1, the JC model is further used to predict the rheological stress σ of aluminum bronze. The JC model is described as follows:
[0048]
[0049] Where A is the stress at ε = 0, i.e., the initial stress, B is the strain hardening coefficient, n is the strain hardening exponent, and ε is the true strain. Used to describe the strain hardening behavior of aluminum bronze under quasi-static deformation;
[0050] Where C is the strain rate sensitivity coefficient. This is a normalized strain rate used to express the sensitivity of aluminum bronze to strain rate.
[0051] T is the normalized temperature, and m is the temperature softening index, used to reflect the softening effect of flow stress at high temperatures. The higher the temperature, the greater the softening effect of T. * As the value approaches 1, the rheological stress of aluminum bronze decreases. Based on the JC model, the change in rheological stress of preheated aluminum bronze during the refining process is analyzed. The parameters in the refining process of aluminum bronze are optimized, and the rheological stress of aluminum bronze is further optimized. Based on the settings of the JC model, the strain hardening behavior of aluminum bronze raw materials under quasi-static deformation, its sensitivity to strain rate, and the softening effect of rheological stress at high temperature are used to calculate the rheological stress of aluminum bronze raw materials during the refining process. This allows for the prediction of the rheological behavior of aluminum bronze during the refining process and the optimization of the parameters in the refining process of aluminum bronze.
[0052] The forging equipment controls the pressure at 100MPa and the forging time at 2h when forging fine equiaxed crystals. The heating system temperature is controlled at 900℃ to heat the fine equiaxed crystals. The annealing temperature of the fine equiaxed crystals is controlled at 800℃ and the time is maintained at 4h. The distribution state of the intermetallic compound strengthening phase is adjusted. Based on the forging of fine equiaxed crystals by the forging equipment, the fine equiaxed crystals are further made finer, thereby reducing the stress in the subsequent aluminum bronze refining.
[0053] Multi-directional forging includes a first forging, a second forging, and a third forging. The first, second, and third forgings are used to upsetting, deform, and refine the aluminum bronze raw material. After upsetting, the aluminum bronze raw material needs to be returned to the furnace for 15 minutes to maintain its temperature. During deformation, the temperature is kept above 680℃. The first, second, and third forgings are based on box-type resistance furnace heating. Through multi-directional forging, fine equiaxed crystals are forged, thereby improving the strength of the aluminum bronze after refining. It also improves the plasticity of the aluminum bronze after refining, making it more convenient for subsequent processing of aluminum bronze.
[0054] Based on the aluminum bronze after the first, second, and third multi-directional forging processes, annealing is used to further enhance the performance of the aluminum bronze. Annealing involves placing the aluminum bronze in an annealing furnace, controlling the temperature at 600℃, holding it at that temperature for 2 hours, and then removing the aluminum bronze to obtain the final aluminum bronze. Annealing improves the toughness and strength of the aluminum bronze.
[0055] Example 3, based on Example 1, further includes the following specific steps in the aluminum bronze refining method for butterfly valve plates:
[0056] S1: Take a certain amount of electrolytic copper and pre-treat the surface of the electrolytic copper to remove the surface oxide scale. At the same time, take aluminum material and preheat it. Also take the prepared aluminum nickel to complete the material preparation. At the same time, use the JC model to predict the rheological stress of aluminum bronze and adjust the aluminum bronze refining parameters.
[0057] S2: Add electrolytic copper to the induction furnace and heat it until the electrolytic copper is completely melted and the melt is uniform. Then, the temperature inside the induction furnace is increased and preheated aluminum material is added. After melting the aluminum material, aluminum nickel, iron, silicon and tin are added inside the induction furnace to reduce the viscosity of the melt inside the induction furnace and the high temperature brittleness, and further reduce the rheological stress of the aluminum bronze raw material.
[0058] S3: Based on the graphite rotor driving the high-purity argon gas to rotate and spray the molten liquid inside the induction furnace, and the preparation of refining agent and covering agent to be added to the molten liquid, the mixed molten liquid is refined, and the refined mixed molten liquid is cast based on the water-cooled copper mold to obtain fine equiaxed crystals.
[0059] S4: Based on multi-directional forging, fine equiaxed crystals are forged and then annealed to obtain the final refined aluminum bronze.
[0060] Example 4, based on Examples 1 and 3, further includes the following specific steps in the aluminum bronze refining method for butterfly valve plates:
[0061] S1: Take a certain amount of electrolytic copper and pre-treat the surface of the electrolytic copper to remove the surface oxide scale. At the same time, take aluminum material and preheat it. Also take the prepared aluminum nickel to complete the material preparation. At the same time, use the JC model to predict the rheological stress of aluminum bronze and adjust the aluminum bronze refining parameters.
[0062] S2: Add electrolytic copper to the induction furnace and heat it until the electrolytic copper is completely melted and the melt is uniform. Then, the temperature inside the induction furnace is increased and preheated aluminum material is added to obtain a mixed solution.
[0063] S3: Based on the graphite rotor driving the high-purity argon gas to rotate and spray the molten liquid inside the induction furnace, and the preparation of refining agent and covering agent to be added to the molten liquid, the mixed molten liquid is refined, and the refined mixed molten liquid is cast based on the water-cooled copper mold to obtain fine equiaxed crystals.
[0064] S4: Based on forging equipment and heating system, fine equiaxed crystals are forged and then annealed to obtain further refined fine equiaxed crystals. Based on multi-directional forging, the fine equiaxed crystals are forged and then annealed to obtain the final refined aluminum bronze.
[0065] Example 5:
[0066] To investigate the promoting effect of the disclosed embodiments on the refining of aluminum bronze used in butterfly valve plates, further experimental verification was conducted based on the technical solutions provided in Embodiments 1, 3, and 4. The experimental steps are as follows:
[0067] Aluminum bronze was refined using the refining methods described in Examples 1, 3, and 4, as well as existing aluminum bronze refining methods. Ten pieces of each type of aluminum bronze were prepared and divided into four groups: experimental group 1 corresponding to Example 1, experimental group 2 corresponding to Example 3, control group corresponding to Example 4, and a blank control group corresponding to existing aluminum bronze refining methods. Figure 2 and Figure 3 Experimental data in the middle;
[0068] according to Figure 2 and Figure 3 As shown, compared with experimental group 2, experimental group 1 and experimental group 2 have similar rheological stress during the aluminum bronze refining process, and the aluminum bronze in experimental group 1 has higher strength than that in experimental group 2.
[0069] Compared with the control group, the strength of the control group was higher than that of the experimental group 2, while the rheological stress of the experimental group 2 was lower than that of the control group.
[0070] The strength of aluminum bronze in experimental group 1 is similar to that in the control group, but the rheological stress in experimental group 1 is lower than that in the control group.
[0071] Compared with the blank control group, the strength of experimental group 1 was higher and the rheological stress of experimental group 1 was lower than that of the blank control group.
[0072] As can be seen from the above, the refining method of experimental group 1 has the best effect. It not only reduces the rheological stress of aluminum bronze during the refining process, but also increases the strength of aluminum bronze after refining, making it more suitable for butterfly valve plates.
[0073] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.
Claims
1. A method for refining aluminum bronze for butterfly valve plates, characterized in that: The specific steps include the following: S1: Take a certain amount of electrolytic copper and pre-treat the surface of the electrolytic copper to remove the surface oxide scale. At the same time, take aluminum material and preheat it. Also take the prepared aluminum nickel to complete the material preparation. At the same time, use the JC model to predict the rheological stress of aluminum bronze and adjust the aluminum bronze refining parameters. S2: Add electrolytic copper to the induction furnace and heat it until the electrolytic copper is completely melted and the melt is uniform. Then, the temperature inside the induction furnace is increased and preheated aluminum material is added. After melting the aluminum material, aluminum nickel, iron, silicon and tin are added inside the induction furnace to reduce the viscosity of the melt inside the induction furnace and the high temperature brittleness, and further reduce the rheological stress of the aluminum bronze raw material. S3: Based on the graphite rotor driving the high-purity argon gas to rotate and spray the molten liquid inside the induction furnace, and the preparation of refining agent and covering agent to be added to the molten liquid, the mixed molten liquid is refined, and the refined mixed molten liquid is cast based on the water-cooled copper mold to obtain fine equiaxed crystals. S4: Based on forging equipment and heating system, fine equiaxed crystals are forged and then annealed to obtain further refined fine equiaxed crystals. Based on multi-directional forging, the fine equiaxed crystals are forged and then annealed to obtain the final refined aluminum bronze.
2. The method for refining aluminum bronze for butterfly valve plates according to claim 1, characterized in that: In S1, the preheating temperature of the aluminum material is controlled at 150-200℃. Argon gas is installed inside the induction furnace to form a protective cover. After the electrolytic copper is completely melted and the melt reaches uniformity, the internal temperature of the induction furnace is controlled at 1200℃. After aluminum material is added inside the induction furnace, the temperature is controlled at 1080-1220℃.
3. The method for refining aluminum bronze for butterfly valve plates according to claim 1, characterized in that: The induction furnace contains 8% aluminum, 0.3% silicon, and 0.2% tin. Silicon is used to form a low-melting-point eutectic, while tin is used to adsorb at grain boundaries to suppress high-temperature brittleness. The aluminum, nickel, and iron contents are 1.7% and 1%, respectively, which are used to refine the intermetallic compound strengthening phase and improve the thermoplasticity of the melt.
4. The method for refining aluminum bronze for butterfly valve plates according to claim 1, characterized in that: The purity of the high-purity argon gas is maintained above 99.999%, the rpm of the graphite rotor is controlled at 500, the flow rate of the high-purity argon gas is controlled at 1.5 L / min·kg, the blowing time is 8 min, and the temperature of the molten liquid is controlled at 1200℃ during blowing. The covering agent is a mixture of calcium fluoride and glass slag, with a ratio of calcium fluoride to glass slag of 1:
1.
5. The method for refining aluminum bronze for butterfly valve plates according to claim 1, characterized in that: The refining agent is prepared by mixing sodium carbonate, sodium hexafluoroaluminate and sodium chloride in a ratio of 4:3:
3. The amount of refining agent added is 0.5%. The refining agent is dehydrated before being added to the melt and is added to the melt in several batches with stirring every 3 minutes. The melt is allowed to stand for 10 minutes after spraying.
6. The method for refining aluminum bronze for butterfly valve plates according to claim 1, characterized in that: The JC model is used to predict the flow stress σ of aluminum bronze. The JC model is described as follows: Where A is the stress at ε = 0, i.e., the initial stress, B is the strain hardening coefficient, n is the strain hardening exponent, and ε is the true strain. Used to describe the strain hardening behavior of aluminum bronze under quasi-static deformation; Where C is the strain rate sensitivity coefficient. This is a normalized strain rate used to express the sensitivity of aluminum bronze to strain rate.
7. The method for refining aluminum bronze for a butterfly valve plate according to claim 6, characterized in that: Where T is the normalized temperature and m is the temperature softening index, used to reflect the softening effect of rheological stress at high temperatures. The higher the temperature, the greater the softening effect of T. * As the value approaches 1, the rheological stress of aluminum bronze decreases accordingly. Based on the JC model, the change in rheological stress of preheated aluminum bronze during the refining process is analyzed. The parameters in the refining of aluminum bronze are optimized to further optimize the rheological stress of aluminum bronze.
8. The method for refining aluminum bronze for a butterfly valve plate according to claim 1, characterized in that: The forging equipment controls the pressure at 100MPa and the forging time at 2 hours when forging fine equiaxed crystals. The heating system controls the temperature at 900℃ to heat the fine equiaxed crystals. The annealing temperature of the fine equiaxed crystals is controlled at 800℃ and the time is maintained at 4 hours to adjust the distribution of the intermetallic compound strengthening phase.
9. The method for refining aluminum bronze for butterfly valve plates according to claim 1, characterized in that: The multi-directional forging process includes a first forging, a second forging, and a third forging. The first forging, the second forging, and the third forging are used to roughen, deform, and refine the aluminum bronze raw material. After roughing, the aluminum bronze raw material needs to be kept in the furnace for 15 minutes. During deformation, the temperature is kept above 680℃. The first forging, the second forging, and the third forging are based on box-type resistance furnace heating.
10. A method for refining aluminum bronze for a butterfly valve plate according to claim 9, characterized in that: Based on the aluminum bronze after the first, second and third multi-directional forging processes, annealing is used to further enhance the performance of the aluminum bronze. The annealing process involves placing the aluminum bronze in an annealing furnace, controlling the temperature at 600℃, holding it at that temperature for 2 hours, and then removing the aluminum bronze to obtain the final aluminum bronze.