A butterfly head with easy processing and controllable precision and a spinning forming method thereof

Abstract

This invention relates to the field of butterfly head manufacturing technology, specifically to a butterfly head that is easy to process and has controllable precision, and its stamping and forming method. The head includes a body, a reinforcing rib layer disposed at the bottom of the body, a connecting component disposed at the bottom of the body, and a sealing element disposed at the bottom of the connecting component. The butterfly head structure of this invention is relatively simple, easy to process and manufacture, and can improve production efficiency. Adding a reinforcing rib layer to the settling groove of the body blank can increase the strength and rigidity of the product. Using aluminum-nickel alloy, aluminum-copper alloy, and aluminum-silicon alloy powders for hot pressing sintering gives the reinforcing rib layer good mechanical properties and corrosion resistance, which enables the butterfly head to have high stress resistance and better withstand external pressure and force loading.

Description

Technical Field

[0001] This invention relates to the field of butterfly head preparation technology, specifically to a butterfly head that is easy to process and has controllable precision, and its punching and spinning forming method. Background Technology

[0002] A butterfly head is a specially shaped container element primarily used in low-pressure vessel systems. It consists of a spherical surface, a cylindrical straight edge, and a transition section. Butterfly heads are commonly used in low-pressure vessels in the chemical industry, such as reactors, storage tanks, and heat exchangers. Their structural characteristics make them suitable for storing and handling chemicals, liquids, or gases under low pressure, and they can be used in oil tanks, gas cylinders, and petroleum refining equipment. Because butterfly heads are typically made of corrosion-resistant materials such as stainless steel, they also have applications in the food and pharmaceutical industries. When using butterfly heads in containers and equipment, it is essential to ensure the safety and hygiene performance of the products.

[0003] Dinnerheads are typically manufactured using a stamping and spinning process. This process involves mold design and selection of pressing parameters to achieve accurate dimensional control and good surface quality. A well-designed stamping process can yield a superior head shape and performance. The materials used in manufacturing dernerheads are usually high-temperature and corrosion-resistant metals, such as stainless steel and carbon steel. Material selection must consider the working environment and usage requirements to ensure the dernerhead possesses the necessary corrosion resistance and mechanical properties.

[0004] As a special type of container component, the development of butterfly heads involves the application of technologies such as structural design, stamping and forming, bending stress resistance, and material selection. The integrated use of these technologies can improve the performance of butterfly heads, meet specific engineering requirements, and expand their application range in various fields. However, currently available butterfly heads are difficult to process, have low precision, and are slow to form, affecting production speed and quality, thus requiring improvement. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a butterfly-shaped end cap that is easy to process and has controllable precision, comprising a body, a reinforcing rib layer disposed at the bottom of the body, a connecting component disposed at the bottom of the body, and a sealing element disposed at the bottom of the connecting component.

[0006] The body is formed by punching and spinning a die and a punch. The diameter of the punch is R = (0.3~0.5)*d, and the longitudinal arc height of the die is h = (0.4~0.6)*d, where R is the diameter of the punch, d is the diameter of the body to be prepared, and h is the longitudinal arc height of the die. The contact area between the punch and the body is 70~90% of the surface area of ​​the punch.

[0007] The reinforcing rib layer is formed by uniformly mixing 25-35 wt% aluminum-nickel alloy powder and 65-75 wt% aluminum-copper alloy powder, drying and grinding to form a base material, then laying a layer of aluminum-silicon alloy powder accounting for 23-33% of the base material on the base material and cold pressing it to form a reinforcing layer blank, and then hot pressing and sintering the reinforcing layer blank and cutting it.

[0008] Explanation: By reinforcing the inner wall of the head with a rib layer, the internal structure of the head can be strengthened without affecting its normal operation. The rib layer significantly increases the stress resistance of the head, making it less prone to deformation under external forces or pressure. This reinforcement enhances the stability and structural strength of the head, enabling it to operate under higher pressure conditions. Using seals and connecting components improves the sealing effect during installation, filling and sealing gaps between the head and other components to prevent media leakage or external contaminants from entering the head, ensuring its sealing performance. During extrusion, the contact area between the punch and the material affects material flow and deformation; controlling the contact area between the punch and the material between 70% and 90% helps achieve optimal extrusion results.

[0009] A method for forming a butterfly-shaped end cap that is easy to process and has controllable precision includes the following steps:

[0010] S1. Preparation of the body blank:

[0011] S1-1, Desulfurization of molten iron:

[0012] Molten iron is produced in a blast furnace and then introduced into a pre-desulfurization system through pipelines for desulfurization treatment.

[0013] S1-2, Steelmaking:

[0014] The pre-desulfurized molten iron is transported to the converter for smelting;

[0015] S1-3, Steelmaking Continuous Casting:

[0016] Molten steel is introduced into an LF furnace for LF refining, and then the LF-refined molten steel is introduced into an RH refining furnace for RH refining. Subsequently, the molten steel is cast using a continuous casting machine to obtain a billet.

[0017] S1-4, Rolling and Cutting:

[0018] After the billet is rolled multiple times and cooled, it is cut to obtain a circular billet; multiple grooves are rolled along the circumference on the surface of the circular billet to obtain the main body billet.

[0019] S2. Preparation of the reinforcing rib layer:

[0020] After mixing 25-35 wt% of aluminum-nickel alloy powder and 65-75 wt% of aluminum-copper alloy powder evenly, drying and grinding to form a base material, a layer of aluminum-silicon alloy powder accounting for 23-33% of the base material mass is laid on the base material and cold-pressed to form a reinforcing layer blank. The reinforcing layer blank is then hot-pressed, sintered and cut to obtain a reinforcing rib layer.

[0021] S3, Welding and Assembly:

[0022] The reinforcing ribs are assembled into the groove of the main blank and welded along the joint to obtain the end plate.

[0023] S4, Stamping and spinning:

[0024] The stamping and spinning die is preheated, and the end cap plate is fixed on the stamping and spinning die using a clamping device or vacuum adsorption method. The stamping and spinning operation is performed on the stamping and spinning machine. During the stamping process, the end cap plate is deformed by applying pressure through the punch. The stamping speed is 4-6 mm / s. At the same time, the forming die rotates, and the end cap plate is gradually stamped into shape to obtain a butterfly end cap. The dimensions are corrected by grinding, followed by deburring and annealing. The butterfly end cap is assembled and welded with the connecting parts, and then assembled and bonded with the sealing parts to obtain the butterfly end cap product.

[0025] Explanation: Through desulfurization and smelting processes, impurities and undesirable elements in molten iron can be effectively removed, improving the purity and quality of the steel and resulting in high-quality cast billets. The stamping and spinning process of this invention allows the end cap plates to be progressively stamped into butterfly-shaped end caps. Grinding, deburring, and annealing of the butterfly-shaped end caps enhance their strength and surface finish, improving product quality. This process further corrects dimensional deviations, enhancing product precision and consistency. Ultimately, precise control of product dimensions ensures accuracy and consistency, providing high-quality, high-strength, high-precision butterfly-shaped end caps with excellent sealing performance.

[0026] Further, the method for desulfurizing molten iron in step S1-1 is as follows: molten iron is introduced into the pre-desulfurization system through a pipeline, and the temperature of the molten iron in the pre-desulfurization system is controlled at 1400-1600℃. Fe2O3, CaO, and Na2S are added to the molten iron by a spraying system at a mass percentage of 0.0001-0.001% of the total mass of the molten iron. The sulfur content of the final molten iron in the pre-desulfurization system is monitored. When the sulfur content in the molten iron is less than or equal to 0.001%, the pre-desulfurization treatment is completed.

[0027] Explanation: By controlling the temperature of molten iron in the pre-desulfurization system and the dosage of additives in the injection system, the sulfur content in molten iron can be effectively reduced. Precise control and adjustment of the desulfurization process can be achieved by controlling the amount of additives and monitoring the final sulfur content of the molten iron. This allows for accurate adjustment of the sulfur content according to needs and process requirements to achieve the desired treatment effect. Furthermore, controlling the temperature of molten iron and the dosage of additives can reduce the impurity content in the molten iron, decrease process fluctuations, and improve the stability of product quality.

[0028] Further, the method for refining molten steel described in steps S1-2 is as follows: the pre-desulfurized molten iron is transported to the converter, and combustion is carried out by injecting preheated air or a mixture of oxygen and pulverized coal. By mass percentage, 0.1-1% ammonium molybdate, 0.5-2% aluminum-nickel alloy, 0.1-1% low-carbon ferrochrome, 0.5-3% silicon-manganese alloy, and 0.1-0.6% antimony blocks are added to the furnace to alloy the molten iron into steel. Before tapping, the ladle is purged with inert gas for 10-15 minutes. The tapping temperature of the converter is 1700-1750℃.

[0029] Explanation: Preheated air or a mixture of oxygen and pulverized coal burns in the converter, producing a high-temperature flame and a reducing atmosphere. This helps increase the furnace temperature and promotes the removal of oxides, while also facilitating the dissolution of alloying elements. Pre-mixed alloying materials are added to the furnace to adjust the composition and structure of the molten steel, precisely controlling and meeting the requirements for manufacturing the butterfly heads. Before tapping, the ladle is purged with inert gases such as argon or nitrogen to reduce the oxygen content and impurities in the molten steel, ensuring its purity.

[0030] Furthermore, in steps S1-3, the tapping temperature of the LF furnace is 1620-1650℃, the tapping temperature of the RH furnace is 1580-1600℃, and the casting speed of the continuous casting machine is 0.5-3m / min.

[0031] Note: By precisely controlling the tapping temperature, the quality and microstructure of the molten steel can be guaranteed to meet the design requirements. Controlling the appropriate casting speed can ensure a uniform solidification and crystallization process, which helps to reduce the generation of defects in the butterfly head products, improve the uniformity and surface quality of the products, and at the same time help to improve production efficiency and output.

[0032] Furthermore, the thickness of the circular billet after rolling and cutting in steps S1-4 is 30-150 mm.

[0033] Note: Controlling the thickness within the range of 30 to 150 mm can meet different production processes and processing requirements, thereby improving processing flexibility and efficiency.

[0034] Further, the hot pressing sintering method described in step S2 is as follows: the reinforcing layer blank is placed in a sintering furnace, and the reinforcing layer blank is heated from room temperature to 700-800℃ at a heating rate of 10-15℃ / min and held for 30 min; then the temperature is raised from 700-800℃ to 1250-1300℃ at a heating rate of 5-10℃ / min and held for 1-1.5 h; finally, the temperature is lowered from 1250-1300℃ to 800-900℃ at a cooling rate of 5-10℃ / min, and vacuum hot pressing is performed under a pressure of 5-10 MPa for 1-2 h.

[0035] Note: Controlling the heating rate and holding parameters helps to homogenize the internal structure of the billet and promote grain growth, thereby improving the material's density and mechanical properties. Using vacuum hot pressing helps eliminate pores and defects within the material, further improving its density and uniformity. This enhances the material's mechanical properties, wear resistance, and corrosion resistance, resulting in a final product with excellent performance and stable quality.

[0036] Further, the mixing method in step S2 is as follows: the proportioned aluminum-nickel alloy powder and aluminum-copper alloy powder are placed in a star-shaped ball mill and mixed for 24 to 36 hours at a speed of 300 rpm / min, and the mixing medium is ethanol; the pressure of the cold pressing is 100 to 150 MPa.

[0037] Explanation: Prolonged operation of a star-shaped ball mill ensures thorough mixing of the aluminum-nickel alloy powder and the aluminum-copper alloy powder, forming a homogeneous mixture. This helps ensure material uniformity and consistency, improving the quality and performance of subsequent cold pressing. During mixing, the ethanol in the ball mill acts as a mixing medium, promoting diffusion between powder particles and increasing interparticle contact. This facilitates the diffusion and interaction of alloying elements, resulting in a more uniform alloy structure. Cold pressing can then form high-density polyatomic particles within a limited time, improving their compactness and strength, reducing porosity and defects, laying a solid foundation for subsequent sintering processes, and increasing production efficiency and output.

[0038] Furthermore, the preheating parameters of the punching die in step S4 are as follows: the forming die is heated to 55-75°C, and the punch is heated to 155-165°C; the rotation speed of the forming die is 10-30 rpm / min.

[0039] Note: Preheating the molding die helps improve the fluidity and plasticity of plastic molding, reduces the friction between the molding die and the plastic, thereby reducing the deformation pressure during molding and promoting the improvement of product molding quality; preheating the punch can increase the molding speed of the butterfly head, shorten the molding cycle, and reduce energy consumption; rotating the molding die can improve production efficiency, improve molding uniformity, and improve product consistency and stability.

[0040] Compared with the prior art, the beneficial effects of the present invention are:

[0041] The butterfly-shaped head structure of this invention is relatively simple, easy to process and manufacture, and can improve production efficiency. Adding a reinforcing rib layer to the settling groove of the main body blank can increase the strength and rigidity of the product. Hot pressing and sintering using aluminum-nickel alloy, aluminum-copper alloy, and aluminum-silicon alloy powders gives the reinforcing rib layer good mechanical properties and corrosion resistance, enabling the butterfly head to have high stress resistance and better cope with external pressure and force loading. By controlling the diameter of the punch and the longitudinal arc height of the punching die, the overall shape of the butterfly head body can be controlled. This facilitates a fast and stable extrusion process, thereby accelerating production speed. Similar product size and shape can be obtained in each production cycle, thus improving product consistency and quality stability, and facilitating processing and production.

[0042] The stamping and spinning process of this invention can progressively stamp end caps into butterfly-shaped end caps. By preheating and heating the stamping and spinning die, and by using clamping devices or vacuum adsorption to fix the end caps, it can be ensured that the end caps can be accurately deformed and formed during the stamping and spinning operations, achieving precise control over the dimensions of the butterfly-shaped end caps. The simultaneous stamping and spinning operation during the stamping process can greatly improve manufacturing efficiency, shorten the production cycle, and achieve uniform stress distribution and deformation. By assembling and welding the butterfly-shaped end caps with connecting components, the integrity and connection density of the butterfly-shaped end caps can be achieved, enabling the product to better adapt to various environments and application requirements. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the overall structure of the butterfly-shaped end cap according to Embodiment 1 of the present invention;

[0044] Figure 2 This is a cross-sectional view of the butterfly-shaped end cap of Embodiment 1 of the present invention;

[0045] Among them, 1-body, 2-reinforcing rib layer, 3-connecting component, 4-sealing component. Detailed Implementation

[0046] The present invention will now be described in more detail with reference to specific embodiments, so as to better demonstrate the advantages of the present invention.

[0047] Example 1

[0048] Example 1 illustrates a butterfly-shaped end cap designed according to the present invention, which is easy to process and has controllable precision. Figure 1 , 2As shown, it includes a body 1, a reinforcing rib layer 2 disposed at the bottom of the body 1, a connecting component 3 disposed at the bottom of the body 1, and a sealing component 4 disposed at the bottom of the connecting component 3.

[0049] Connecting component 3 is a welded joint; sealing component 4 is a sealing gasket;

[0050] The body 1 is formed by punching and spinning a die and a punch. The diameter of the punch is R = 0.4 * d, and the longitudinal arc height of the punching and spinning die is h = 0.5 * d, where R is the diameter of the punch, d is the diameter of the body 1 to be prepared, and h is the longitudinal arc height of the punching and spinning die; the contact area between the punch and the body 1 is 77-83% of the surface of the punch.

[0051] The reinforcing rib layer 2 is formed by uniformly mixing 30wt% aluminum-nickel alloy powder and 70wt% aluminum-copper alloy powder, drying and grinding to form a base material, laying a layer of aluminum-silicon alloy powder accounting for 28% of the base material mass on the base material, and cold pressing to form a reinforcing layer blank, and then hot pressing and sintering the reinforcing layer blank and cutting it.

[0052] Example 2

[0053] This embodiment illustrates a punching and spinning method for a butterfly-shaped end cap that is easy to process and has controllable precision, as designed in Embodiment 1 of the present invention. The content is as follows:

[0054] S1. Preparation of blank 1 for body body:

[0055] S1-1, Desulfurization of molten iron:

[0056] Molten iron is produced in a blast furnace and introduced into a pre-desulfurization system via pipeline for desulfurization treatment. The temperature of the molten iron in the pre-desulfurization system is controlled at 1500℃. Fe₂O₃ (0.0005%), CaO (0.065%), and Na₂S (0.0055%) are added to the molten iron via a spraying system, based on a mass percentage. The sulfur content of the molten iron at the end of the pre-desulfurization process is monitored; if the sulfur content is 0.0002%, the pre-desulfurization treatment is complete. The pre-desulfurization system is an existing KR method desulfurization device system, and the spraying system uses an existing molten iron desulfurization spraying device system.

[0057] S1-2, Steelmaking:

[0058] The pre-desulfurized molten iron is transported to the converter for smelting. The pre-desulfurized molten iron is transported to the converter and burned by injecting preheated air or a mixture of oxygen and pulverized coal to produce a high-temperature flame and a reducing atmosphere. By mass percentage, 0.55% ammonium molybdate, 1.25% aluminum-nickel alloy, 0.55% low-carbon ferrochrome, 1.75% silicon-manganese alloy, and 0.35% antimony blocks are added to the furnace to alloy the molten iron into steel. Before tapping, the ladle is purged with inert gas for 12.5 minutes. The tapping temperature of the converter is 1725℃.

[0059] S1-3, Steelmaking Continuous Casting:

[0060] Molten steel is introduced into an LF furnace for LF refining, and then the LF-refined molten steel is introduced into an RH refining furnace for RH refining. Subsequently, the molten steel is cast using a continuous casting machine to obtain a billet. The tapping temperature of the LF furnace is 1635℃, the tapping temperature of the RH furnace is 1590℃, and the casting speed of the continuous casting machine is 1.75m / min.

[0061] S1-4, Rolling and Cutting:

[0062] After the billet is rolled multiple times and cooled, it is cut to obtain a circular billet with a thickness of 90mm; multiple grooves are rolled on the surface of the circular billet along the circumferential direction to obtain the body 1 billet;

[0063] S2, Preparation of reinforced rib layer 2:

[0064] 30 wt% of aluminum-nickel alloy powder and 70 wt% of aluminum-copper alloy powder were uniformly mixed. The mixed aluminum-nickel alloy powder and aluminum-copper alloy powder were placed in a star ball mill and mixed for 30 hours at a speed of 300 rpm / min. The mixing medium was ethanol. After drying, the mixture was ground to obtain a base material. Aluminum-silicon alloy powder, accounting for 28% of the mass of aluminum-copper alloy powder, was uniformly spread on the base material. The powder was then cold-pressed to form a solid shape at a pressure of 125 MPa to obtain a reinforced layer blank. The reinforced layer blank was then hot-pressed and sintered, and cut according to the size of the settling tank to obtain the reinforced rib layer 2.

[0065] The hot pressing sintering method is as follows: the reinforced layer blank is placed in a sintering furnace and heated from room temperature to 750℃ at a heating rate of 12.5℃ / min, and held for 30 min; then heated from 750℃ to 1275℃ at a heating rate of 7.5℃ / min, and held for 1.25 h; finally, cooled from 1275℃ to 850℃ at a cooling rate of 7.5℃ / min, and vacuum hot pressed under a pressure of 7.5 MPa for 1.5 h.

[0066] S3, Welding and Assembly:

[0067] The reinforcing rib layer 2 is assembled into the groove of the body 1 blank and welded along the connection to obtain the end plate;

[0068] S4, Stamping and spinning:

[0069] The stamping and spinning die is preheated, with the forming die heated to 65°C and the punch heated to 160°C. The end cap plate is fixed on the stamping and spinning die using a clamping device or vacuum adsorption method. The stamping and rotating operations are performed on the stamping and spinning machine, with the forming die rotating at a speed of 20 rpm / min. During the stamping process, the end cap plate is deformed by applying pressure to it through the punch at a stamping speed of 5 mm / s. While stamping, the forming die rotates, gradually stamping the end cap plate into shape to obtain a butterfly-shaped end cap. Its dimensions are corrected through a grinding process, followed by deburring and annealing. The butterfly-shaped end cap is then assembled and welded with the connecting component 3, and finally assembled and bonded with the sealing component 4 to obtain the butterfly-shaped end cap product.

[0070] Example 3

[0071] The difference between this embodiment and Embodiment 2 is that the temperature of the molten iron in the pre-desulfurization system is controlled at 1400℃; and 0.0001% Fe2O3, 0.03% CaO, and 0.001% Na2S are added to the molten iron through a spraying system, accounting for 0.0001% of the total mass of the molten iron.

[0072] Example 4

[0073] The difference between this embodiment and Embodiment 2 is that the temperature of the molten iron in the pre-desulfurization system is controlled at 1600℃; and 0.001% Fe2O3, 0.1% CaO, and 0.01% Na2S by mass of the molten iron are added to the molten iron through a spraying system.

[0074] Example 5

[0075] The difference between this embodiment and Embodiment 2 is that, by mass percentage, 0.1% ammonium molybdate, 0.5% aluminum-nickel alloy, 0.1% low-carbon ferrochrome, 0.5% silicon-manganese alloy, and 0.1% antimony blocks are added to the furnace to alloy the molten iron and produce steel.

[0076] Example 6

[0077] The difference between this embodiment and Embodiment 2 is that, by mass percentage, 1% ammonium molybdate, 2% aluminum-nickel alloy, 1% low-carbon ferrochrome, 3% silicon-manganese alloy, and 0.6% antimony blocks are added to the furnace to alloy the molten iron into steel.

[0078] Example 7

[0079] The difference between this embodiment and embodiment 2 is that: 25 wt% of aluminum-nickel alloy powder and 75 wt% of aluminum-copper alloy powder are uniformly mixed, dried and ground to obtain a base material; aluminum-silicon alloy powder accounting for 23% of the mass of aluminum-copper alloy powder is uniformly spread on the base material, and then the powder is cold-pressed to obtain a reinforced layer blank.

[0080] Example 8

[0081] The difference between this embodiment and embodiment 2 is that: 35 wt% of aluminum-nickel alloy powder and 65 wt% of aluminum-copper alloy powder are uniformly mixed, dried and ground to obtain a base material; aluminum-silicon alloy powder accounting for 33% of the mass of aluminum-copper alloy powder is uniformly spread on the base material, and then the powder is cold-pressed to obtain a reinforced layer blank.

[0082] Example 9

[0083] The difference between this embodiment and Embodiment 2 is that the tapping temperature of the LF furnace is 1620℃, the tapping temperature of the RH furnace is 1580℃, and the casting speed of the continuous casting machine is 0.5m / min.

[0084] Example 10

[0085] The difference between this embodiment and Embodiment 2 is that the tapping temperature of the LF furnace is 1650℃, the tapping temperature of the RH furnace is 1600℃, and the casting speed of the continuous casting machine is 3m / min.

[0086] Example 11

[0087] The difference between this embodiment and Embodiment 2 is that the hot pressing sintering method in step S2 is as follows: the reinforcing layer blank is placed in a sintering furnace and heated from room temperature to 700°C at a heating rate of 10°C / min, and held for 30 min; then heated from 700°C to 1250°C at a heating rate of 5°C / min, and held for 1 h; finally, cooled from 1250°C to 800°C at a cooling rate of 5°C / min, and vacuum hot pressed for 1 h under a pressure of 5 MPa.

[0088] Example 12

[0089] The difference between this embodiment and Embodiment 2 is that the hot pressing sintering method in step S2 is as follows: the reinforcing layer blank is placed in a sintering furnace and heated from room temperature to 800°C at a heating rate of 15°C / min, and held for 30 min; then heated from 800°C to 1300°C at a heating rate of 10°C / min, and held for 1.5 h; finally, cooled from 1300°C to 900°C at a cooling rate of 10°C / min, and vacuum hot pressed for 2 h under a pressure of 10 MPa.

[0090] Example 13

[0091] The difference between this embodiment and embodiment 2 is that the mixing method in step S2 is as follows: the proportioned aluminum-nickel alloy powder and aluminum-copper alloy powder are placed in a star-shaped ball mill and mixed for 24 hours at a speed of 300 rpm / min. The mixing medium is ethanol. The pressure for cold pressing is 100 MPa.

[0092] Example 14

[0093] The difference between this embodiment and embodiment 2 is that the mixing method in step S2 is as follows: the proportioned aluminum-nickel alloy powder and aluminum-copper alloy powder are placed in a star-shaped ball mill and mixed for 36 hours at a speed of 300 rpm / min. The mixing medium is ethanol. The pressure for cold pressing is 150 MPa.

[0094] Example 15

[0095] The difference between this embodiment and embodiment 2 is that the preheating parameters of the stamping die in step S4 are: the forming die is heated to 55°C, the punch is heated to 155°C; the forming die rotation speed is 10 rpm / min; and the stamping speed is 4 mm / s.

[0096] Example 16

[0097] The difference between this embodiment and embodiment 2 is that the preheating parameters of the stamping die in step S4 are: the forming die is heated to 75°C, the punch is heated to 165°C; the forming die rotation speed is 30 rpm / min; and the stamping speed is 6 mm / s.

[0098] Application examples

[0099] Eight different butterfly heads were prepared using the methods of comparative examples and Examples 2, 5-8, 11, and 12, and the performance of the prepared butterfly heads was tested. The specific test results are shown in Table 1. The comparative example differs from Example 2 in that the welded reinforcing rib layer 2 was not prepared and assembled.

[0100] Table 1: Performance Test Table of 8 Different Butterfly-Shaped Head Samples

[0101]

[0102] The following conclusions can be drawn from the data in Table 1:

[0103] 1. To investigate the effect of different component ratios of additives used in steelmaking on the performance of the prepared butterfly heads.

[0104] Comparing Examples 2, 5, and 6, it can be seen that the material strength of Example 2 is the highest among the three sets of experiments. This indicates that the proportioning parameters of Example 2 are the best, and the stress resistance of the butterfly head is the highest, making it less prone to deformation.

[0105] 2. To investigate the effect of different component ratios in the preparation of the reinforcing layer blank on the performance of the prepared butterfly head.

[0106] When comparing Examples 2, 7, and 8, it can be seen that Example 8 has the best performance and the best parameter ratio among the three sets of experiments. Example 7 is slightly better than Example 2, but the difference is not significant.

[0107] 3. Investigate the effects of different process parameters for hot pressing and sintering of the reinforcing rib layer 2 on the performance of the prepared butterfly head.

[0108] Comparing the comparative example with Example 2, it can be seen that the material strength of Example 2 is much higher than that of the comparative example, indicating that the reinforcing rib layer can provide stable support and fixation to improve the stress resistance of the butterfly head.

[0109] When comparing Example 2 with Examples 11 and 12, it can be seen that in the three sets of experiments, the material strength of Example 2 is the best, and the material strength of Example 11 is better than that of Example 12. When preparing the butterfly head, the process parameters of Example 2 can be used preferentially.

Claims

1. A method for spinning forming a butterfly head with easy workability and controllable precision, characterized in that, The method comprises the following steps: S1, preparing a blank of the body (1); S1-1, desulfurization of molten iron; molten iron is produced by a blast furnace, and the molten iron is introduced into a pre-desulfurization system through a pipeline for desulfurization treatment; S1-2, smelting of molten iron; the pre-desulfurized molten iron is transported to a converter for smelting; S1-3, steelmaking and continuous casting; the molten iron is introduced into an LF furnace for LF refining, the LF-refined molten iron is introduced into an RH refining furnace for RH refining, and then the molten iron is cast by a continuous casting machine to obtain a casting blank; S1-4, rolling and cutting; the casting blank is cooled after being rolled multiple times, and a circular blank is obtained after cutting; a plurality of grooves are rolled on the surface of the circular blank in the circumferential direction to obtain a blank of the body (1); S2, preparation of the reinforcing rib layer (2); after the base material is formed by uniformly mixing and drying 25-35wt% of aluminum-nickel alloy powder and 65-75wt% of aluminum-copper alloy powder and grinding, a layer of aluminum-silicon alloy powder with a mass ratio of 23-33% to the base material is laid on the base material and cold-pressed to form a reinforcing layer blank, and the reinforcing layer blank is obtained after hot-pressing sintering and cutting to obtain the reinforcing rib layer (2); S3, welding and assembly; the reinforcing rib layer (2) is assembled into the groove of the blank of the body (1), and is welded and fixed along the connecting part to obtain a head plate; S4, punching and spinning forming; the punch spinning die is preheated, the head plate is fixed on the punch spinning die by using a clamping device or a vacuum adsorption method, and punching and spinning operations are performed on the punch spinning machine. During the punching process, the head plate is deformed by pressing it with a punch at a speed of 4-6 mm / s. The head plate is gradually formed by punching and spinning at the same time. A butterfly head piece is obtained. The size is corrected by polishing process, and then deburring and annealing treatment are performed. The butterfly head piece is assembled with the connecting part (3) and welded, and then assembled with the sealing piece (4) and bonded to obtain a butterfly head product. The butterfly head product comprises a body (1), a reinforcing rib layer (2) arranged at the bottom of the body (1), a connecting part (3) arranged at the bottom of the body (1), and a sealing piece (4) arranged at the bottom of the connecting part (3); The body (1) is prepared by a swaging die and a punch, the diameter of the punch is: The swaging die Wherein, R is the diameter of the punch, d is the diameter of the body (1) to be prepared, h is the longitudinal arc height of the swaging die; the contact area of the punch and the body (1) extrusion is 70~90% of the surface of the punch.

2. A method of flow forming a precision controllable butterfly head as claimed in claim 1, wherein, In step S1-1, the method for desulfurizing the molten iron is as follows: the molten iron is introduced into a pre-desulfurization system through a pipeline, the temperature of the molten iron in the pre-desulfurization system is controlled to be 1400-1600℃, 0.0001-0.001% of Fe2O3, 0.03-0.1% of CaO and 0.001-0.01% of Na2S are added into the molten iron by a spraying system according to the mass percentage, the total mass of the molten iron is 0.0001-0.001%, the sulfur content of the final molten iron in the pre-desulfurization system is monitored, and the pre-desulfurization treatment is completed when the sulfur content in the molten iron is less than or equal to 0.001%.

3. A method of flow forming a precision controllable and easy to machine butterfly head as claimed in claim 1, wherein, The method for refining molten steel in step S1-2 is as follows: the pre-desulfurized molten iron is delivered to a converter, a mixture of preheated air or oxygen and coal powder is sprayed and combusted, 0.1-1% of ammonium molybdate, 0.5-2% of aluminum-nickel alloy, 0.1-1% of low-carbon chromium iron, 0.5-3% of silicon-manganese alloy and 0.1-0.6% of antimony block are added into the converter, the molten iron is alloyed, the ladle is purged with inert gas for 10-15 minutes before tapping, and the tapping temperature of the converter is 1700-1750°C.

4. A method of flow forming a precision controllable and easy to machine butterfly head as claimed in claim 1, wherein, The tapping temperature of the LF furnace in step S1-3 is 1620-1650°C, the tapping temperature of the RH refining furnace is 1580-1600°C, and the casting speed of the continuous casting machine is 0.5-3 m / min.

5. A method of flow forming a precision controllable and easy to machine butterfly head as claimed in claim 1, wherein, The thickness of the round blank after rolling and cutting in step S1-4 is 30-150 mm.

6. A flow forming method of a precision controllable and easy to process butterfly head as claimed in claim 1, characterized in that, The method for hot-pressing sintering in step S2 is as follows: the strengthened layer blank is placed in a sintering furnace, the strengthened layer blank is heated from room temperature to 700-800°C at a heating rate of 10-15°C / min, and is kept at 700-800°C for 30 min; then the strengthened layer blank is heated from 700-800°C to 1250-1300°C at a heating rate of 5-10°C / min, and is kept at 1250-1300°C for 1-1.5 h; finally, the strengthened layer blank is cooled from 1250-1300°C to 800-900°C at a cooling rate of 5-10°C / min, and is vacuum hot-pressed at a pressure of 5-10 MPa for 1-2 h.

7. A method of flow forming a precision controllable and easy to machine butterfly head as claimed in claim 1, wherein, The mixing method in step S2 is as follows: the aluminum-nickel alloy powder and the aluminum-copper alloy powder are placed in a star-shaped ball mill, mixed for 24-36 h at a rotation speed of 300 rpm / min, and the mixing medium is ethanol; the pressure for cold-pressing forming is 100-150 MPa.

8. A flow forming method of a precision controllable and easy to process butterfly head as claimed in claim 1, characterized in that, The preheating parameters of the punching and rotating die in step S4 are as follows: the forming die is heated to 55-75°C, and the punch is heated to 155-165°C; the rotation speed of the forming die is 10-30 rpm / min.

9. A method of flow forming a precision controllable and easy to machine butterfly head as claimed in claim 1, wherein, The method for hot-pressing sintering in step S2 is as follows: the strengthened layer blank is placed in a sintering furnace, the strengthened layer blank is heated from room temperature to 700-800°C at a heating rate of 10-15°C / min, and is kept at 700-800°C for 30 min; then the strengthened layer blank is heated from 700-800°C to 1250-1300°C at a heating rate of 5-10°C / min, and is kept at 1250-1300°C for 1-1.5 h; finally, the strengthened layer blank is cooled from 1250-1300°C to 800-900°C at a cooling rate of 5-10°C / min, and is vacuum hot-pressed at a pressure of 5-10 MPa for 1-2 h.

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