A method for manufacturing a carbide valve ball and semi-processing equipment

Abstract

The present disclosure relates to a cemented carbide valve ball manufacturing method, comprising: S1, batching and mixing: S1.1, batching: selecting main material, hard carbide, binder phase and forming agent by percentage; wherein the main material comprises WC powder; the hard carbide adopts one or any combination of titanium carbide, chromium carbide and vanadium carbide; the binder phase adopts Co powder or Ni powder; the forming agent adopts PEG or paraffin; S1.2, mixing: after mixing the main material, hard carbide, binder phase and forming agent, adding alcohol grinding and spray drying, thereby generating a mixture; S2, pressing forming: pressing the mixture generated in S1 into a near-spherical compact; S3, semi-processing: processing the near-spherical compact into a standard spherical compact through semi-processing equipment; S4, sintering: placing the standard spherical compact on a graphite sintering tool in the shape of a ball, and sintering through a hydrogen PEG removal-low pressure sintering integrated sintering process, finally obtaining a cemented carbide valve ball.

Description

Technical Field

[0001] This invention relates to the field of alloy valve ball processing and manufacturing, and more specifically, to a method and semi-processing equipment for manufacturing a cemented carbide valve ball. Background Technology

[0002] Oilfield development is gradually shifting towards reservoirs with deeper burial depths, lower energy levels, and poorer permeability, resulting in increasingly harsh working environments. Simultaneously, to improve the efficiency of oil extraction, the requirements for the service life of pumping unit equipment are increasing, leading to higher demands on the materials used in key components like valve balls. Greater requirements are being placed on the uniformity and stability of valve ball materials. Furthermore, with the increasing need to improve valve ball grinding efficiency, the control of dimensional deformation and reduction of allowances in valve ball blanks are becoming increasingly urgent.

[0003] Currently, cemented carbide valve balls on the market generally suffer from defects such as porosity, carburization, and uneven microstructure, resulting in insufficient material life and unstable quality. Furthermore, the valve ball blanks exhibit significant deformation, requiring increased machining allowances during subsequent grinding, which substantially impacts grinding efficiency. This invention provides a method for producing cemented carbide valve balls that effectively solves problems such as uneven microstructure, porosity, carburization, and large deformation of the valve ball blank, and enables highly efficient automated processing and production.

[0004] However, there are currently no relevant solutions on the market. Summary of the Invention

[0005] In view of the above-mentioned technical problems in related technologies, the present invention proposes a method for manufacturing a cemented carbide valve ball and a semi-processing equipment, which can overcome the above-mentioned deficiencies of the prior art.

[0006] To achieve the above-mentioned technical objectives, the technical solution of the present invention is implemented as follows:

[0007] The primary objective of this disclosure is to provide a method for manufacturing a cemented carbide valve ball, comprising the following steps:

[0008] S1 Ingredients and Mix:

[0009] S1.1 Ingredients: Select the main ingredient, hard carbide, binder phase, and forming agent by mass percentage; wherein, the main ingredient includes WC powder; the hard carbide is one or any combination of titanium carbide, chromium carbide, and vanadium carbide; the binder phase is Co powder or Ni powder; the forming agent is PEG or paraffin wax;

[0010] S1.2 Mixing: After mixing the main material, hard carbide, binder phase and molding agent, add alcohol, grind and spray dry to generate a mixture;

[0011] S2 pressing molding: The mixture generated in S1 is pressed into a near-spherical compact;

[0012] S3 semi-processing: processing the near-spherical compact into a standard spherical compact;

[0013] S4 sintering: placing the standard spherical compact on a graphite sintering tool in the shape of a ball, sintering by a hydrogen PEG removal-low pressure sintering integrated sintering process, and finally obtaining a cemented carbide valve ball.

[0014] Preferably, in S1, the mass percentage content of the main material is 52.5%-95.2%, the mass percentage content of the hard carbide is 0.3%-30%, the mass percentage content of the binder phase is 4%-16%, the mass percentage content of the forming agent is <1.5%, and the percentage content of the main material, hard carbide, binder phase and forming agent adds up to 100%.

[0015] Preferably, in S2, the mixed material is molded by a powder molding press to form the near-spherical compact.

[0016] Preferably, the powder molding press includes a semi-circular upper punch, a semi-circular lower punch and a female mold, and the near-spherical compact is pressed into the near-spherical compact by the semi-circular upper punch, the semi-circular lower punch and the female mold.

[0017] Preferably, the near-spherical compact has a stepped waistband.

[0018] Preferably, in S2, the mixed material is loaded into an elastic quasi-spherical soft mold by positive pressure blowing, and then the elastic quasi-spherical soft mold is vibrated to form a cold isostatic pressing compact, and the cold isostatic pressing compact is placed in a cold isostatic pressing machine for pressure forming to form the near-spherical compact.

[0019] Preferably, in S3, the near-spherical compact is processed into the standard spherical compact by a semi-processing device.

[0020] The second object of the present disclosure is to provide a semi-processing device for the cemented carbide valve ball manufacturing method, which comprises a clamping assembly, a workbench and a processing assembly; the clamping assembly and the workbench are respectively left-right symmetrical structures as a whole;

[0021] The clamping assembly comprises a top plate, the top plate is provided with a compression cylinder on the left and right sides at the top, and the top plate is provided with a top rod assembly on the left and right sides at the bottom, the top rod assembly comprises a vertically aligned upper top rod and a lower top rod, the upper top rod is connected to the bottom of the top plate, and the upper top rod and the lower top rod are used to clamp the near-spherical compact between the bottom of the upper top rod and the top of the lower top rod;

[0022] The workbench is arranged on the top of the base, and the bottom of the base is connected to the ground.

[0023] The workbench is a rotary double-station workbench, and each of the two stations on the left and right sides of the top of the workbench is symmetrically provided with one station, and the stations on the same side are connected with the bottom of the lower top rod;

[0024] The ground is provided with a transverse feeding guide rail, the bottom of the machining assembly is in sliding connection with the transverse feeding guide rail, the side of the machining assembly facing the clamping assembly is provided with a center height adjusting guide rail, and the center height adjusting guide rail is in sliding connection with a cutter corresponding to the station.

[0025] In implementation, the transverse position of the machining assembly and the cutter relative to the clamping assembly or the workbench is adjusted through the transverse feeding guide rail, and the longitudinal position of the cutter relative to the clamping assembly or the workbench is adjusted through the center height adjusting guide rail, so that the cutter is aligned with the corresponding near-spherical compact, and then the machining of the near-spherical compact by the cutter is realized, and finally the near-spherical compact is machined into the standard spherical compact by the cutter. The transverse feeding guide rail realizes the feeding of the cutter, and the center height adjusting guide rail realizes the adjustment of the center height of the cutter when machining compacts of different sizes. The workbench is a rotary double-station workbench, which realizes simultaneous operation of clamping and machining of the compact and reduces the idle running time of the equipment.

[0026] The two stations alternately serve as a clamping station and a machining station, the clamping assembly above the clamping station clamps a second near-spherical compact while the cutter above the machining station machines a first near-spherical compact, the clamping station has completed the clamping of the second near-spherical compact after the machining of the first near-spherical compact by the cutter is completed, then the workbench rotates the two stations by 180°, so that the clamping station and the machining station are alternated, at this time, the new machining station is the original clamping station and the new clamping station is the original machining station, the cutter continues to machine the second near-spherical compact on the new machining station, and the new clamping station continues to clamp a third near-spherical compact, and the cycle is repeated.

[0027] During the machining of the cutter, the adjacent clamping assemblies are rotated, so as to ensure that the spherical surface of the near-spherical compact is uniformly machined.

[0028] Preferably, the compression cylinder is preferably an air compression cylinder.

[0029] Preferably, the cutter is preferably a crescent-shaped cutter. The crescent-shaped cutter is more convenient for machining the near-spherical compact into a spherical shape.

[0030] Preferably, during the machining of the crescent-shaped cutter, the adjacent clamping assemblies are preferably rotated by 90° each time, so as to ensure that the crescent-shaped cutter uniformly machines the spherical surface of the near-spherical compact.

[0031] Preferably, the tool material is preferably PCD material.

[0032] Preferably, the semi-processing equipment is controlled by numerical control programming to realize automatic processing.

[0033] Preferably, the semi-processing equipment can also be equipped with a high negative pressure dust collection pipeline or a material collection port.

[0034] The present disclosure has the following advantages: when the present disclosure is compounded, the content of the special forming agent (PEG, paraffin) is less than 1.5%. First, PEG is used as the forming agent of the mixed material to improve the strength of the compact, so that the compact can be directly processed without pre-burning. In traditional powder metallurgy production, the compact needs to be pre-burned to a certain strength before being processed into a semi-finished product. Second, the content of the special forming agent (PEG, paraffin) is less than 1.5%, which will not cause cracks in the compacting and molding. In traditional cemented carbide production, the content of the forming agent is more than 2%, and less than 2% is easy to cause cracks in the compacting and molding or cannot be molded. Third, the content of the forming agent (PEG, paraffin) is less than 1.5%, which is beneficial to the complete removal of the forming agent in the subsequent sintering process, and ensures the uniformity of the microstructure of the cemented carbide valve ball.

[0035] When the present disclosure is compacted and molded, the mold pressing adopts a hemispherical upper punch, a lower punch and a female mold to press a nearly spherical mold compact with a stepped waistband. The cold isostatic pressing adopts a high polymer material with a certain elasticity to make an elastic imitation spherical soft mold. The mixed material is loaded into the elastic imitation spherical soft mold through positive pressure blowing, and then the mold is sealed. After vibration shaping, the mixed material is placed in a cold isostatic pressing machine for pressing and molding. The compacted compact is nearly spherical.

[0036] The semi-processing equipment provided by the present disclosure can process the nearly spherical compact into a standard spherical compact through the cooperation of the lower top rod, the upper top rod, the compression cylinder, the crescent-shaped tool, the feeding guide rail, the center height adjustment guide rail, the double-station rotary workbench, the closed protective cover, etc. The semi-processing equipment includes a clamping unit and a processing table. During operation, the operator only needs to replace the compact in the clamping unit and control the process quality. The clamping unit contacts the compact through two imitation spherical upper and lower top rods, and is pressurized by a compression cylinder and a top plate, so as to clamp the nearly spherical compact.

[0037] The workbench is a rotary double-station workbench. A work station is symmetrically arranged on the top of the workbench on the left and right sides. The two work stations alternately serve as a clamping station and a processing station. The double stations are rotated alternately. When the processing station is processing the first compact, the clamping station is clamping another compact for standby. After the processing is completed, the workbench is rotated. The original clamping station runs to the processing station for processing, and the original processing station runs to the clamping station for clamping. In this way, the stations are repeatedly changed to perform cyclic processing.

[0038] The semi-processing cutter shape can adopt a crescent cutter and the material can adopt PCD, to ensure that a complete spherical product is processed and the quality stability of batch production is ensured. After the near-spherical compact is processed once, the clamping direction of the product is changed by 90°, the spherical surface in another direction is processed, and the spherical surface is ensured to be uniformly processed. The semi-processing equipment can be automatically operated through numerical control programming, production efficiency is improved, and human error rate is reduced. When the semi-finished product equipment is processed, the processing area is in a closed protective cover all the time, a high negative pressure dust collection system is additionally installed in the protective cover, and a special material collection port is designed. The air quality of the working environment is good, the whole processing process is convenient, safe and stable, and thus the product quality is ensured.

[0039] The present disclosure has the following advantages: (1) The cemented carbide valve ball forming agent produced by the present disclosure is completely removed, the microstructure is uniform, and the roundness of the shape is within 0.2 mm. (2) The present disclosure can realize mixed material change card batch production. When the shrinkage changes greatly, the mold does not need to be re-modified. Only the pressing and semi-processing parameters need to be fine-tuned. (3) The present disclosure provides a special semi-processing equipment, which can efficiently, in batches and stably produce high-quality cemented carbide valve ball products. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0041] Figure 1 It is a structural schematic diagram of the semi-processing equipment described in the present disclosure.

[0042] Figure 2 It is a clamping and cutter schematic diagram for semi-processing described in the present disclosure.

[0043] Figure 3 It is a structural schematic diagram of the mold pressing forming described in the present disclosure.

[0044] Figure 4 It is a structural schematic diagram of the cold isostatic pressing forming described in the present disclosure.

[0045] In the figure: 1, lower ram; 2, near-spherical compact; 3, upper ram; 4, compression cylinder; 5, top plate; 6, workbench; 7, base; 8, ground; 9, cutter; 10, center height adjustment guide rail; 11, transverse feed guide rail; 12, upper punch; 13, lower punch; 14, female mold; 15, near-spherical compact; 1501, step waistband; 16, elastic imitation spherical soft mold; 17, compact to be cold isostatic pressed. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.

[0047] As Figures 1-4 shown, in order to facilitate the understanding of the above technical solutions of the present application, the above technical solutions of the present application will be described in detail below through specific use modes.

[0048] The first object of the present disclosure is to provide a cemented carbide valve ball manufacturing method, which comprises the following steps:

[0049] S1. compounding and mixing:

[0050] S1.1. compounding: selecting main material, hard carbide, binder phase and forming agent by mass percentage; wherein the main material comprises WC powder; the hard carbide adopts one or any combination of titanium carbide, chromium carbide and vanadium carbide; the binder phase adopts Co powder or Ni powder; the forming agent adopts PEG or paraffin wax;

[0051] S1.2. mixing: after mixing the main material, hard carbide, binder phase and forming agent uniformly, grinding and spray drying are further added, thereby generating a mixed material;

[0052] S2. pressing forming: the mixed material generated in S1 is pressed into a near-spherical compact 15;

[0053] S3. semi-processing: the near-spherical compact 15 is processed into a standard spherical compact;

[0054] S4. sintering: the standard spherical compact is placed on a graphite sintering tool in the shape of a ball, and sintering is performed through a hydrogen PEG removal-low pressure sintering integrated sintering process, finally obtaining a cemented carbide valve ball.

[0055] In an embodiment, in S1, the mass percentage content of the main material is 52.5%--95.2%, the mass percentage content of the hard carbide is 0.3%--30%, the mass percentage content of the binder phase is 4%--16%, the mass percentage content of the forming agent is <1.5%, and the sum of the percentage contents of the main material, hard carbide, binder phase and forming agent is 100%.

[0056] In an embodiment, in S2, the mixed material is molded by a powder forming press, thereby being pressed into the near-spherical compact 15.

[0057] In an embodiment, the powder forming press comprises a semicircular upper punch 12, a semicircular lower punch 13 and a negative mold 14, and the near-spherical compact 15 is pressed into the near-spherical compact 15 by the semicircular upper punch 12, the semicircular lower punch 13 and the negative mold 14.

[0058] In one embodiment, the near-spherical compact 15 has a stepped waistband 1501.

[0059] In one embodiment, in S2, the mixture is loaded into the elastic quasi-spherical soft mold 16 by positive pressure blowing, and then the elastic quasi-spherical soft mold 16 is vibrated to form the cold isostatic pressing compact 17. The cold isostatic pressing compact 17 is placed in a cold isostatic pressing machine for pressure forming, thereby pressing the near-spherical compact 15.

[0060] In one embodiment, in S3, the near-spherical compact 15 is processed into the standard spherical compact by semi-processing equipment.

[0061] The second object of the present disclosure is to provide semi-processing equipment for the cemented carbide valve ball manufacturing method, which comprises a clamping assembly, a workbench 6, and a processing assembly; the clamping assembly and the workbench 6 are respectively in a left-right symmetrical structure as a whole.

[0062] The clamping assembly comprises a top plate 5, wherein the top plate 5 is provided with a compression cylinder 4 on each of the left and right sides at the top, and is provided with a top rod assembly on each of the left and right sides at the bottom. The top rod assembly comprises an upper top rod 3 and a lower top rod 1 vertically aligned, wherein the upper top rod 3 is connected to the bottom of the top plate 5 at the top, and the bottom of the upper top rod 3 and the top of the lower top rod 1 are used to clamp the near-spherical compact 2.

[0063] The workbench 6 is arranged on the top of a base 7, and the base 7 is connected to the ground 8 at the bottom.

[0064] The workbench 6 is a rotary double-station workbench, and each of the left and right sides of the top of the workbench 6 is provided with a station, and the stations on the same side are connected to the bottom of the lower top rod 1.

[0065] The ground 8 is provided with a transverse feed guide 11, and the processing assembly is slidably connected to the transverse feed guide 11 at the bottom. The side of the processing assembly facing the clamping assembly is provided with a center height adjustment guide 10, and the center height adjustment guide 10 is slidably connected to a tool 9 corresponding to the station.

[0066] In implementation, the transverse position of the machining assembly and the tool 9 relative to the clamping assembly or the worktable 6 is adjusted by the transverse feed guide 11, and the longitudinal position of the tool 9 relative to the clamping assembly or the worktable 6 is adjusted by the center height adjustment guide 10, so that the tool 9 is aligned with the corresponding near-spherical compact 2, and the near-spherical compact 2 is machined into a standard spherical compact by the tool 9. The transverse feed guide 11 realizes the feed of the tool 9, and the center height adjustment guide 10 realizes the adjustment of the center height of the tool 9 when machining compacts of different sizes. The worktable 6 is a rotary double-station worktable, which realizes the simultaneous operation of clamping and machining of the compact, and reduces the idle running time of the equipment.

[0067] The two stations alternately serve as a clamping station and a machining station. When the tool 9 is machining the first near-spherical compact 2 above the machining station, the clamping assembly above the clamping station is clamping the second near-spherical compact 2. After the tool 9 finishes machining the first near-spherical compact 2, the clamping station has finished clamping the second near-spherical compact 2. Then the worktable 6 rotates the two stations by 180°, so that the clamping station and the machining station are alternated. At this time, the new machining station is the original clamping station, and the new clamping station is the original machining station. The tool 9 continues to machine the second near-spherical compact 2 on the new machining station, and the new clamping station continues to clamp the third near-spherical compact 2, and the cycle is repeated.

[0068] During the machining of the tool 9, the adjacent clamping assembly is rotated, so as to ensure that the spherical surface of the near-spherical compact 2 is uniformly machined.

[0069] In an embodiment, the compression cylinder 4 is preferably an air compression cylinder.

[0070] In an embodiment, the material of the tool 9 is preferably a crescent-shaped tool. The crescent-shaped tool is more convenient for machining the near-spherical compact into a spherical compact.

[0071] In an embodiment, during the machining of the crescent-shaped tool, the adjacent clamping assembly is preferably rotated by 90° each time, so as to ensure that the crescent-shaped tool uniformly machines the spherical surface of the near-spherical compact 2.

[0072] In an embodiment, the material of the tool 9 is preferably PCD material.

[0073] In an embodiment, the semi-machining equipment is controlled by a numerical control programming program to realize automatic machining.

[0074] In an embodiment, the semi-machining equipment can also be equipped with a high negative pressure dust collection pipeline or a material collection port.

[0075] The principles of this disclosure will be further demonstrated and explained through the following three embodiments.

[0076] The mixture is prepared by mass percentageing WC (main material) at 82.5%-89.2%, chromium carbide (hard carbide) at 0.3%-1%, and Co (binder phase) at 10%-15%. During the alcohol grinding process, 0.5%-1.5% PEG molding agent is added, followed by spray drying to obtain the final mixture. This mixture is then filled into a cemented carbide mold and pressed into a near-spherical compact with a stepped waistband on a powder forming press. The compact diameter is 25.60 mm. The compact was machined on the semi-finishing equipment manufactured in this invention. The clamping cylinder pressure was 0.1-0.15 MPa, the product rotation speed was 500 r / min, the tool feed rate was 15 mm / min, and the crescent-shaped tool had a diameter of 24.23 mm and a width of 18.10 mm. After machining, the compact was placed on a specific spherical sintering fixture and then placed in a pressure sintering furnace. A hydrogen-de-PEG-low-pressure sintering integrated sintering process was used to obtain cemented carbide valve balls. The diameters of 50 valve balls after semi-finishing and sintering were measured, and their dimensions and material results are shown in Table 1.

[0077] Table 1: Dimensions and material of the valve ball with a diameter of 19.94 mm prepared in Example 1 after semi-processing and sintering.

[0078]

[0079] The mixture is prepared by mass percentageing WC (main material) at 87.5%-95.2%, chromium carbide (hard carbide) at 0.3%-1%, and Ni (binder phase) at 4%-10%. During the grinding process with added alcohol, 0.5%-1.5% PEG molding agent is added, followed by spray drying to obtain the final mixture. This mixture is then filled into a cemented carbide mold and pressed into a near-spherical compact with a stepped waistband on a powder forming press. The compact diameter is 39.08 mm. The compact was machined on the semi-finishing equipment manufactured in this invention. The clamping cylinder pressure was 0.15-0.2 MPa, the product rotation speed was 500 r / min, the tool feed rate was 15 mm / min, and the crescent-shaped tool had a diameter of 36.68 mm and a width of 27.35 mm. After machining, the compact was placed on a specific spherical sintering fixture and then placed in a pressure sintering furnace. A hydrogen-de-PEG-low-pressure sintering integrated sintering process was used to obtain cemented carbide valve balls. The diameters of 50 valve balls after semi-finishing and sintering were measured, and their dimensions and material results are shown in Table 2.

[0080] Table 2: Dimensions and material of the valve ball with a diameter of 29.53 mm prepared in Example 2 after semi-finishing and sintering.

[0081]

[0082] According to WC (main material) mass percentage content 52.5-62%, titanium carbide (hard carbide) mass percentage content 25-30%, Ni+Co (binder phase) mass percentage content 12-16%, ingredients are prepared, and 1.0%-1.5% PEG forming agent is added in the process of adding alcohol grinding, and then mixed material is obtained by spray drying. The mixed material is loaded into a polymer soft mold and placed in a cold isostatic pressing machine to press out a near spherical compact, and the compact diameter is 65.10-66.65mm. The compact is processed on the semi-addition equipment manufactured in the application, the clamping cylinder pressure is 0.2-0.3Mpa, the product rotation speed is 500r / min, the cutter feed speed is 12mm / min, the diameter of the crescent-shaped cutter is 63.05mm, and the width is 45.90mm. After processing, the compact is placed on a special spheroid sintering tool and placed in a pressure sintering furnace, and a hydrogen PEG removal-low pressure sintering integrated sintering process is used for sintering to obtain a hard alloy valve ball. The diameters of 50 valve balls after semi-processing and sintering are measured, and the size and material results are shown in Table 3.

[0083] Table 3: The size and material of the valve ball with a diameter of 52.32mm prepared in Example Three after semi-processing and sintering

[0084]

[0085] It can be seen from the above three examples that the hard alloy valve ball prepared by the application has uniform microstructure, the roundness of the shape is within 0.2mm, and the industry technical requirements can be met to meet the requirements of stable batch production.

[0086] In summary, through the unique design described above, the application has the following beneficial effects (1) The hard alloy valve ball produced by the application has clean forming agent removal, uniform microstructure, and the roundness of the shape is within 0.2mm. (2) The application can realize mixed material change batch number production, and when the shrinkage changes greatly, the mold does not need to be modified again, and only the pressing and semi-processing parameters need to be adjusted. (3) The application provides a special semi-processing equipment, which can efficiently, batch and stably produce high-quality hard alloy valve ball products.

[0087] The above only describes the preferred embodiments of the application and is not intended to limit the application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the application shall be included in the protection scope of the application.

Claims

1. A method of manufacturing a cemented carbide valve ball, characterized in that, The method comprises the following steps: S1.1 ingredients: selecting main materials, hard carbide, binder phase and forming agent by mass percentage; wherein the main materials include WC powder; the hard carbide uses one or any combination of titanium carbide, chromium carbide and vanadium carbide; the binder phase uses Co powder or Ni powder; the forming agent uses PEG or paraffin; S1.2 mixing: after mixing the main materials, hard carbide, binder phase and forming agent, grinding and spray drying are added, thereby generating a mixture; In the S1, the mass percentage content of the main materials is 52.5%-95.2%, the mass percentage content of the hard carbide is 0.3%-30%, the mass percentage content of the binder phase is 4%-16%, the mass percentage content of the forming agent is <1.5%, and the mass percentage content of the main materials, hard carbide, binder phase and forming agent is 100%; S2 pressing: the mixture generated in S1 is pressed into a near-spherical compact (15); In the S2, the mixture is molded by a powder forming press, thereby being pressed into the near-spherical compact (15); The powder forming press comprises a semicircular upper punch (12), a semicircular lower punch (13) and a negative mold (14), the near-spherical compact (15) is pressed into the near-spherical compact (15) by the semicircular upper punch (12), the semicircular lower punch (13) and the negative mold (14), and the near-spherical compact (15) is provided with a stepped waistband (1501); S3 semi-processing: the near-spherical compact (15) is processed into a standard spherical compact by a semi-processing equipment; The semi-processing equipment comprises a clamping assembly, a workbench (6) and a processing assembly; the clamping assembly and the workbench (6) are respectively left-right symmetrical structures; The clamping assembly comprises a top plate (5), the top plate (5) is provided with a compression cylinder (4) on the left and right sides at the top, and the top plate (5) is provided with a top rod assembly on the left and right sides at the bottom; the top rod assembly comprises vertically aligned upper and lower top rods (3) and (1), the upper top rod (3) is connected to the bottom of the top plate (5), and the near-spherical compact (2) is clamped between the bottom of the upper top rod (3) and the top of the lower top rod (1); The workbench (6) is arranged on the top of a base (7), and the base (7) is connected to the ground (8) at the bottom; The workbench (6) is a rotary double-station workbench, each station is symmetrically arranged on the left and right sides of the top of the workbench (6), and the stations on the same side are connected to the bottom of the lower top rod (1); A horizontal feed guide (11) is arranged on the ground (8), the processing assembly is slidably connected to the horizontal feed guide (11) at the bottom, a center height adjustment guide (10) is arranged on the side of the processing assembly facing the clamping assembly, and a cutter (9) corresponding to the station is slidably connected to the center height adjustment guide (10). ​ In implementation, the transverse position of the machining assembly and the cutter (9) relative to the clamping assembly or the workbench (6) is adjusted by the transverse feed guide (11), and the longitudinal position of the cutter (9) relative to the clamping assembly or the workbench (6) is adjusted by the central height adjustment guide (10), so that the cutter (9) is aligned with the corresponding near-spherical compact (2), and then the near-spherical compact (2) is machined by the cutter (9), and finally the near-spherical compact (2) is machined into a standard spherical compact by the cutter (9); The two workstations alternately serve as clamping workstations and machining workstations. When the cutter (9) is machining the first near-spherical compact (2) above the machining workstation, the clamping assembly above the clamping workstation is clamping the second near-spherical compact (2). After the cutter (9) finishes machining the first near-spherical compact (2), the clamping workstation has finished clamping the second near-spherical compact (2). Then the workbench (6) rotates the two workstations by 180°, thereby completing the alternation of the clamping workstation and the machining workstation. At this time, the new machining workstation is the original clamping workstation, and the new clamping workstation is the original machining workstation. The cutter (9) continues to machine the second near-spherical compact (2) above the new machining workstation. Similarly, the new clamping workstation continues to clamp the third near-spherical compact (2), and the cycle is repeated. During the machining process of the cutter (9), the adjacent clamping assemblies rotate accordingly, thereby ensuring that the spherical surface of the near-spherical compact (2) is uniformly machined. S4 sintering: placing the standard spherical compact on a graphite sintering tool in the shape of a sphere, and sintering through a sintering process integrating hydrogen PEG removal and low-pressure sintering, thereby obtaining a hard alloy valve ball.

2. The method of manufacturing a cemented carbide valve ball according to claim 1, characterized in that The compression cylinder (4) is a compressed air cylinder.

3. The method of claim 1, wherein the cementing is performed by using a cementing agent comprising a binder and a solvent. The cutter (9) is a crescent-shaped cutter.

4. The method of claim 1, wherein the cementing is performed by using a cementing agent comprising 80 to 95 wt% of a binder and 5 to 20 wt% of a solvent. The cutter (9) is made of PCD material. The semi-machining equipment is controlled by a numerical control programming program to realize automatic machining.

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