Hard alloy valve ball manufacturing method and semi-machining equipment

Abstract

The invention relates to a manufacturing method of a hard alloy valve ball. The manufacturing method comprises the steps that S1, burdening and mixing are conducted; S1.1, burdening is conducted, specifically, a main material, hard carbide, a binding phase and a forming agent are selected according to the percentage; wherein the main material comprises WC powder; the hard carbide is one or any combination of titanium carbide, chromium carbide and vanadium carbide; co powder or Ni powder is adopted as the binding phase; pEG (Polyethylene Glycol) or paraffin is adopted as the forming agent; s1.2, mixing: uniformly mixing the main material, the hard carbide, the binding phase and the forming agent, adding alcohol, grinding, and carrying out spray drying, so as to generate a mixture; s2, compression molding: pressing the mixture generated in the S1 into a nearly spherical green compact; s3, semi-processing: processing the nearly spherical green compact into a standard spherical green compact through semi-processing equipment; and S4, sintering is conducted, specifically, the standard spherical pressed blank is placed on a ball-like graphite sintering tool, sintering is conducted through the hydrogen PEG removal-low-pressure sintering integrated sintering technology, and finally the hard alloy valve ball is obtained.

Description

Technical Field

[0001] The invention relates to the field of alloy valve ball processing and manufacturing, and in particular to a hard alloy valve ball manufacturing method and semi-processing equipment. Background Art

[0002] Oilfield development is gradually shifting to oil reservoirs with deeper strata, lower energy and poorer permeability. The working environment is becoming more and more demanding. At the same time, in order to improve the efficiency of oil extraction, the service life of oil pump equipment is becoming more and more demanding. The material requirements for its key component, the valve ball, are also becoming higher and higher, and the material uniformity and stability of the valve ball material are also higher. In addition, with the demand for improving the grinding efficiency of the valve ball, the control of the size deformation and reduction of the allowance of the valve ball blank are becoming increasingly urgent.

[0003] At present, cemented carbide valve balls on the market generally have defects such as holes, carburization, and uneven structure, and the material life is insufficient and the quality is unstable; the valve ball blanks are greatly deformed, and the subsequent grinding allowance needs to be increased, which has a great impact on the grinding efficiency. The method of a cemented carbide valve ball of the present invention can effectively solve the problems of uneven structure, holes, carburization and other material defects, large deformation of valve ball blanks, etc., and can realize efficient automated processing and production.

[0004] But currently, there is no relevant solution on the market. Summary of the invention

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

[0006] To achieve the above technical objectives, the technical solution of the present invention is implemented as follows: The first object of the present disclosure is to provide a method for manufacturing a cemented carbide valve ball, comprising the following steps: S1 Ingredients and Mix: S1.1 Ingredients: Select the main material, hard carbide, binder phase and molding agent according to percentage; wherein the main material 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 molding agent is PEG or paraffin; S1.2 Mixing: After the main material, hard carbide, binder phase and forming agent are mixed, alcohol is added to grind and spray-dried to form a mixture; S2: pressing and molding: pressing the mixed material generated in S1 into a nearly spherical green compact; S3 semi-processing: processing the nearly spherical compact into a standard spherical compact; S4 sintering: placing the standard spherical compact on a spherical graphite sintering tool, and sintering it through a hydrogen dePEG-low-pressure sintering integrated sintering process to finally obtain a cemented carbide valve ball.

[0007] Preferably, in S1, the percentage content of the main material is 52.5%-95.2%, the percentage content of the hard carbide is 0.3%-30%, the percentage content of the binding phase is 4%-16%, the percentage content of the forming agent is <1.5%, and the cumulative sum of the percentage contents of the main material, hard carbide, binding phase and forming agent is 100%.

[0008] Preferably, in S2, the mixed material is pressed into the nearly spherical green compact by a powder molding press.

[0009] Preferably, the powder molding press comprises a semicircular upper punch, a semicircular lower punch and a female die, and the nearly spherical compact is pressed into the nearly spherical compact by the semicircular upper punch, the semicircular lower punch and the female die.

[0010] Preferably, the nearly spherical compact has a stepped waistband.

[0011] Preferably, in S2, the mixed material is loaded into an elastic spherical soft mold by positive pressure blowing, and then shaped into a green compact to be isostatically pressed by vibration of the elastic spherical soft mold, and the green compact to be isostatically pressed is placed in a cold isostatic press for pressure molding, thereby being pressed into the near-spherical green compact.

[0012] Preferably, in S3, the nearly spherical compact is processed into the standard spherical compact by semi-processing equipment.

[0013] 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 and overall bilaterally symmetrical structures; The clamping assembly includes a top plate, a compression cylinder is respectively provided on the left and right sides of the top of the top plate, and a push rod assembly is respectively provided on the left and right sides of the bottom of the top plate, and the push rod assembly includes an upper push rod and a lower push rod that are vertically aligned, the top of the upper push rod is connected to the bottom of the top plate, and the bottom of the upper push rod and the top of the lower push rod are used to clamp the nearly spherical compact; The workbench is arranged on the top of the base, and the bottom of the base is connected to the ground; The workbench is a rotary double-station workbench, with a station symmetrically arranged on the left and right sides of the top of the workbench, and the stations located on the same side are connected to the bottom of the lower push rod; A transverse feed guide rail is provided on the ground, the bottom of the processing component is slidably connected to the transverse feed guide rail, a center height adjustment guide rail is provided on the side of the processing component facing the clamping component, and a tool corresponding to the workstation is slidably connected to the center height adjustment guide rail.

[0014] During implementation, the lateral position of the processing assembly and the tool relative to the clamping assembly or the workbench is adjusted by the lateral feed guide rail, and the longitudinal position of the tool relative to the clamping assembly or the workbench is adjusted by the center height adjustment guide rail, so that the tool is aligned with the corresponding nearly spherical compact, and then the tool processes the nearly spherical compact, and finally the nearly spherical compact is processed into the standard spherical compact by the tool. The lateral feed guide rail realizes the feeding of the tool, and the center height adjustment guide rail realizes the adjustment of the center height of the tool when processing compacts of different sizes. The workbench is a rotary double-station workbench, which realizes the simultaneous clamping and processing of the compact, reducing the idle running time of the equipment.

[0015] The two stations respectively act as the clamping station and the processing station in rotation. When the tool processes the first nearly spherical compact above the processing station, the clamping assembly above the clamping station clamps the second nearly spherical compact; after the tool has finished processing the first nearly spherical compact, the clamping station has completed the work of clamping the second nearly spherical compact; then the workbench rotates the two stations 180°, thereby completing the rotation of the clamping station and the processing station. At this time, the new processing station is the original clamping station and the new clamping station is the original processing station. The tool continues to process the second nearly spherical compact on the new processing station. Similarly, the new clamping station continues to clamp the third nearly spherical compact, and the cycle is repeated.

[0016] During the tool machining process, the adjacent clamping components rotate accordingly, thereby ensuring that the spherical surface of the nearly spherical compact is machined evenly.

[0017] Preferably, the compression cylinder is a compressed air cylinder.

[0018] Preferably, the tool material is preferably a crescent-shaped tool, which is more convenient for processing a nearly spherical compact into a full spherical shape.

[0019] Preferably, during the processing of the crescent-shaped tool, the rotation amplitude of the adjacent clamping assemblies is preferably 90° each time, so as to ensure that the crescent-shaped tool processes the spherical surface of the nearly spherical compact evenly.

[0020] Preferably, the tool material is PCD material.

[0021] Preferably, the semi-processing equipment is controlled by a numerical control programming program to achieve automated processing.

[0022] Preferably, the semi-processing equipment may also be equipped with a high negative pressure dust collection duct or a material receiving port.

[0023] The beneficial effects of the present invention: When the present invention prepares the ingredients, a proprietary molding agent (PEG, paraffin) is added with a content of less than 1.5%. First, PEG is used as a molding agent for the mixture to improve the strength of the pressed green sheet, and the pressed green sheet can be directly processed without pre-burning. In traditional powder metallurgy production, the pressed green sheet needs to be pre-burned and reach a certain strength before it can be processed into a semi-finished product. Second, the proprietary molding agent (PEG, paraffin) content is less than 1.5%, which will not cause cracks in the pressing molding. In traditional cemented carbide production, the molding agent content is above 2%, and a molding agent content below 2% is likely to cause cracks in the pressing molding or failure to form. Third, the molding agent (PEG, paraffin) content is less than 1.5%, which is conducive to the clean removal of the molding agent in the subsequent sintering process, ensuring the uniformity of the structure of the cemented carbide valve ball.

[0024] During the pressing and forming of the disclosed product, the mold pressing adopts a hemispherical upper punch, a lower punch and a female mold to press a nearly spherical molded green sheet with a stepped waistband. Cold isostatic pressing adopts a polymer material with certain elasticity similar to a balloon as an elastic spherical soft mold, and the mixed material is filled into the elastic spherical soft mold by positive pressure blowing, and then sealed, and then vibrated and shaped, and placed in a cold isostatic press for pressure molding, and the pressed green sheet is nearly spherical.

[0025] The semi-processing equipment provided by the present disclosure can realize the processing of the nearly spherical compact into a standard spherical compact by the cooperation of a lower push rod, an upper push rod, a compression cylinder, a crescent-shaped tool, a feed guide rail, a center height adjustment guide rail, a double-station rotary worktable, a closed shield, etc. The semi-processing equipment includes a clamping unit and a processing table. During the operation, the operator only needs to replace the compact in the clamping unit and perform process quality control. The clamping unit contacts the compact through two spherical upper push rods and a lower push rod, and is pressurized by a compression cylinder and a top plate, thereby realizing the clamping of the nearly spherical compact.

[0026] The workbench is a rotary double-station workbench, with a station symmetrically arranged on the left and right sides of the top of the workbench. The two stations serve as the clamping station and the processing station in turn, and the double stations rotate in turn, that is, when the processing station is processing the first compact, another compact is clamped at the clamping station for standby use. After the processing is completed, the workbench rotates, and the original clamping station moves to the processing station for processing, and the original processing station moves to the clamping station for clamping, so that the station changes repeatedly for cyclic processing.

[0027] The semi-processing tool shape can be a crescent-shaped tool and the material can be PCD, which ensures the processing of complete spherical products and the quality stability of mass production. After the nearly spherical pressed billet is processed once, the clamping direction of the product is changed by 90°, and the spherical surface in another direction is processed to ensure that the spherical surface is processed evenly. The semi-processing equipment can be automatically operated through CNC programming to improve production efficiency and reduce the human error rate. When the semi-finished product equipment is processed, the processing area is in a closed protective cover throughout the process, and a high negative pressure dust collection system is installed in the protective cover, and a special material receiving port is designed. The air quality of the working environment is good, and the entire processing process is convenient, safe and stable, thereby ensuring product quality.

[0028] The present disclosure has the following advantages: (i) The cemented carbide valve ball produced by the present disclosure has a clean removal of the molding agent, a uniform microstructure, and an outer roundness within 0.2 mm. (ii) The present disclosure can realize the production of mixed material batches. When the shrinkage changes greatly, there is no need to modify the mold again, and only the pressing and semi-processing parameters need to be fine-tuned. (iii) The present disclosure provides special semi-processing equipment, which can efficiently, batch-wise, and stably produce high-quality cemented carbide valve ball products. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 It is a schematic structural diagram of the semi-processing equipment described in the present disclosure.

[0031] Figure 2 This is a schematic diagram of the semi-machining clamping and tool described in the present invention.

[0032] Figure 3 It is a schematic diagram of the structure of the compression molding described in the present invention.

[0033] Figure 4 It is a schematic diagram of the structure of the cold isostatic pressing molding described in the present invention.

[0034] In the figure: 1. lower ejector pin; 2. nearly spherical compact; 3. upper ejector pin; 4. compression cylinder; 5. ejector plate; 6. workbench; 7. base; 8. floor; 9. tool; 10. center height adjustment guide rail; 11. lateral feed guide rail; 12. upper punch; 13. lower punch; 14. female mold; 15. nearly spherical compact; 1501. step belt; 16. elastic spherical soft mold; 17. compact to be cooled and isostatically pressed. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0036] like Figure 1-4 As shown, in order to facilitate understanding of the above technical solutions of the present invention, the above technical solutions of the present invention are described in detail below through specific usage methods.

[0037] The first object of the present disclosure is to provide a method for manufacturing a cemented carbide valve ball, which comprises the following steps: S1 Ingredients and Mix: S1.1 Ingredients: Select the main material, hard carbide, binder phase and molding agent according to percentage; wherein the main material 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 molding agent is PEG or paraffin; S1.2 Mixing: After the main material, hard carbide, binder phase and forming agent are mixed, alcohol is added to grind and spray-dried to form a mixture; S2: pressing and molding: pressing the mixed material generated in S1 into a nearly spherical green compact 15; S3 semi-processing: processing the nearly spherical compact 15 into a standard spherical compact; S4 sintering: placing the standard spherical compact on a spherical graphite sintering tool, and sintering it through a hydrogen dePEG-low-pressure sintering integrated sintering process to finally obtain a cemented carbide valve ball.

[0038] In one embodiment, in S1, the percentage content of the main material is 52.5%-95.2%, the percentage content of the hard carbide is 0.3%-30%, the percentage content of the binding phase is 4%-16%, the percentage content of the forming agent is <1.5%, and the cumulative sum of the percentage contents of the main material, hard carbide, binding phase and forming agent is 100%.

[0039] In one embodiment, in S2, the mixed material is pressed into the nearly spherical green compact 15 by a powder molding press.

[0040] In one embodiment, the powder molding press includes a semicircular upper punch 12, a semicircular lower punch 13 and a female die 14, and the nearly spherical compact 15 is pressed into the nearly spherical compact 15 by the semicircular upper punch 12, the semicircular lower punch 13 and the female die 14.

[0041] In one embodiment, the nearly spherical compact 15 has a stepped waistband 1501 .

[0042] In one embodiment, in S2, the mixed material is loaded into an elastic spherical soft mold 16 by positive pressure blowing, and then shaped into a cold isostatically pressed blank 17 by vibration of the elastic spherical soft mold 16, and the cold isostatically pressed blank 17 is placed in a cold isostatic press and pressurized to form the near-spherical blank 15.

[0043] In one embodiment, in S3, the nearly spherical compact 15 is processed into the standard spherical compact by semi-processing equipment.

[0044] The second object of the present disclosure is to provide a semi-processing device for the cemented carbide valve ball manufacturing method, which includes a clamping assembly, a workbench 6 and a processing assembly; the clamping assembly and the workbench 6 are respectively and overall bilaterally symmetrical structures; The clamping assembly includes a top plate 5, a compression cylinder 4 is respectively provided on the left and right sides of the top of the top plate 5, and a push rod assembly is respectively provided on the left and right sides of the bottom of the top plate 5, and the push rod assembly includes an upper push rod 3 and a lower push rod 1 which are vertically aligned, and the top of the upper push rod 3 is connected to the bottom of the top plate 5, and the bottom of the upper push rod 3 and the top of the lower push rod 1 are used to clamp the nearly spherical compact 2; The workbench 6 is arranged on the top of the base 7, and the bottom of the base 7 is connected to the ground 8; The workbench 6 is a rotary double-station workbench, and a workstation 601 is symmetrically arranged on the left and right sides of the top of the workbench 6, and the workstation 601 on the same side is connected to the bottom of the lower push rod 1; A transverse feed guide rail 11 is provided on the ground 8, and the bottom of the processing component is slidably connected to the transverse feed guide rail 11. A center height adjustment guide rail 10 is provided on the side of the processing component facing the clamping component, and a tool 9 corresponding to the workstation 601 is slidably connected to the center height adjustment guide rail 10.

[0045] During implementation, the lateral position of the processing assembly and the tool 9 relative to the clamping assembly or the workbench 6 is adjusted by the lateral feed guide rail 11, and the longitudinal position of the tool 9 relative to the clamping assembly or the workbench 6 is adjusted by the center height adjustment guide rail 10, so that the tool 9 is aligned with the corresponding nearly spherical green compact 2, and then the tool 9 processes the nearly spherical green compact 2, and finally the nearly spherical green compact 2 is processed into the standard spherical green compact by the tool 9. The lateral feed guide rail 11 realizes the feeding of the tool 9, and the center height adjustment guide rail 10 realizes the adjustment of the center height of the tool 9 when processing green compacts of different sizes. The workbench 6 is a rotary double-station workbench, which realizes the simultaneous clamping and processing of the green compact, reducing the idle running time of the equipment.

[0046] The two stations 601 respectively serve as the clamping station and the processing station in rotation. When the tool 9 processes the first nearly spherical green sheet 2 above the processing station, the clamping assembly above the clamping station clamps the second nearly spherical green sheet 2; after the tool 9 has finished processing the first nearly spherical green sheet 2, the clamping station has completed the work of clamping the second nearly spherical green sheet 2; then the workbench 6 rotates the two stations 601 180°, thereby completing the rotation of the clamping station and the processing station. At this time, the new processing station is the original clamping station and the new clamping station is the original processing station. The tool 9 continues to process the second nearly spherical green sheet 2 on the new processing station. Similarly, the new clamping station continues to clamp the third nearly spherical green sheet 2, and the cycle is repeated.

[0047] During the machining process of the tool 9 , the adjacent clamping components rotate accordingly, thereby ensuring that the spherical surface of the nearly spherical compact 2 is machined evenly.

[0048] In one embodiment, the compression cylinder 4 is preferably a compressed air cylinder.

[0049] In one embodiment, the tool 9 is preferably made of a crescent-shaped tool, which is more convenient for processing a nearly spherical compact into a full spherical shape.

[0050] In a certain embodiment, during the processing of the crescent-shaped tool, the rotation amplitude of the adjacent clamping assemblies is preferably 90° each time, so as to ensure that the crescent-shaped tool processes the spherical surface of the nearly spherical compact 2 evenly.

[0051] In one embodiment, the tool 9 is preferably made of PCD material.

[0052] In one embodiment, the semi-processing equipment is controlled by a numerical control programming program to achieve automated processing.

[0053] In one embodiment, the semi-processing equipment may also be equipped with a high negative pressure dust collection duct or a material receiving port.

[0054] The principle of the present disclosure is further demonstrated and illustrated by the following three embodiments.

[0055] Example 1: Preparation of a valve ball with a diameter of 19.94 mm The ingredients are prepared according to the mass percentage of WC (main material) of 82.5%-89.2%, the mass percentage of chromium carbide (hard carbide) of 0.3%-1%, and the mass percentage of Co (binder phase) of 10%-15%. 0.5%-1.5% of PEG molding agent is added during the alcohol grinding process, and then the mixture is obtained by spray drying. The mixture is filled into a cemented carbide mold and pressed into a nearly spherical green compact with a step belt on a powder molding press. The green compact has a diameter of 25.60 mm. The pressed green sheet is processed on the semi-processing equipment manufactured by the present invention, the clamping cylinder pressure is 0.1-0.15Mpa, the product speed is 500r / min, the tool feed speed is 15mm / min, the diameter of the crescent-shaped tool is 24.23mm, and the width is 18.10mm. After the processing is completed, the pressed green sheet is placed on a specific spherical sintering tool, placed in a pressure sintering furnace, and sintered by a hydrogen dePEG-low-pressure sintering integrated sintering process to obtain a cemented carbide 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 1.

[0056] Table 1: Dimensions and materials of the valve ball with a diameter of 19.94 mm prepared in Example 1 after semi-processing and sintering

[0057] Example 2: Preparation of a valve ball with a diameter of 29.53 mm The ingredients are prepared according to the mass percentage of WC (main material) of 87.5%-95.2%, the mass percentage of chromium carbide (hard carbide) of 0.3%-1%, and the mass percentage of Ni (binder phase) of 4%-10%, and 0.5%-1.5% of PEG molding agent is added during the alcohol grinding process, and then the mixture is obtained by spray drying. The mixture is filled into a cemented carbide mold and pressed into a nearly spherical green compact with a step belt on a powder molding press, and the green compact diameter is 39.08mm. The pressed green sheet was processed on the semi-processing equipment manufactured by the present invention, the clamping cylinder pressure was 0.15-0.2Mpa, the product speed was 500r / min, the tool feed speed was 15mm / min, the diameter of the crescent-shaped tool was 36.68mm, and the width was 27.35mm. After the processing was completed, the pressed green sheet was placed on a specific spherical sintering tool, placed in a pressure sintering furnace, and sintered by a hydrogen dePEG-low-pressure sintering integrated sintering process to obtain a cemented carbide valve ball. The diameters of 50 valve balls after semi-processing and sintering were measured, and the size and material results are shown in Table 2.

[0058] Table 2: Dimensions and materials of the valve ball with a diameter of 29.53 mm prepared in Example 2 after semi-processing and sintering

[0059] Example 3: Preparation of a valve ball with a diameter of 52.32 mm The ingredients are prepared according to the mass percentage content of WC (main material) of 52.5-62%, the mass percentage content of titanium carbide (hard carbide) of 25-30%, and the mass percentage content of Ni+Co (binder phase) of 12-16%, and 1.0%-1.5% of PEG forming agent is added during the grinding process of adding alcohol, and then spray-dried to obtain a mixture. The mixture is filled into a polymer soft mold and placed in a cold isostatic press to press out a nearly spherical green compact, and the green compact diameter is 65.10-66.65mm. The green compact is processed on the semi-additive equipment manufactured by the present invention, the clamping cylinder pressure is 0.2-0.3Mpa, the product rotation speed is 500r / min, the tool feed speed is 12mm / min, the diameter of the crescent-shaped tool is 63.05mm, and the width is 45.90mm. After processing, the compact is placed on a specific spherical sintering tool, placed in a pressure sintering furnace, and sintered using a hydrogen dePEG-low-pressure sintering integrated sintering process to obtain a cemented carbide valve ball. The diameters of 50 valve balls after semi-processing and sintering were measured, and their size and material results are shown in Table 3.

[0060] Table 3: Dimensions and materials of the valve ball with a diameter of 52.32 mm prepared in Example 3 after semi-processing and sintering

[0061] It can be seen from the above three embodiments that the cemented carbide valve ball prepared in the present invention has a uniform microstructure and an outer roundness within 0.2 mm, which can meet the technical requirements of the industry and satisfy the requirements of stable batch production.

[0062] In summary, through the above unique design, the present disclosure has the following beneficial effects: (i) The cemented carbide valve ball molding agent produced by the present disclosure is removed cleanly, the microstructure is uniform, and the roundness of the shape is within 0.2mm. (ii) The present disclosure can realize the production of mixed material batches. When the shrinkage changes greatly, there is no need to modify the mold again, and only the pressing and semi-processing parameters need to be fine-tuned. (iii) The present disclosure provides special semi-processing equipment, which can efficiently, batch and stably produce high-quality cemented carbide valve ball products.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for manufacturing a cemented carbide valve ball, characterized in that: The following steps are involved: S1 Ingredients and mix: S1.1 Ingredients: Select the main material, hard carbide, binder phase and molding agent according to percentage; wherein the main material 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 molding agent is PEG or paraffin; S1.2 Mixing: After the main material, hard carbide, binder phase and forming agent are mixed, alcohol is added to grind and spray-dried to form a mixture; S2: pressing and molding: pressing the mixed material produced in S1 into a nearly spherical green compact (15); S3 semi-processing: processing the nearly spherical compact (15) into a standard spherical compact by semi-processing equipment; S4 sintering: placing the standard spherical compact on a spherical graphite sintering tool, and sintering through a hydrogen dePEG-low-pressure sintering integrated sintering process to finally obtain a cemented carbide valve ball.

2. The method for manufacturing a cemented carbide valve ball according to claim 1, characterized in that: In S1, the percentage content of the main material is 52.5%-95.2%, the percentage content of the hard carbide is 0.3%-30%, the percentage content of the binding phase is 4%-16%, the percentage content of the molding agent is <1.5%, and the cumulative sum of the percentage contents of the main material, hard carbide, binding phase and molding agent is 100%.

3. The method for manufacturing a cemented carbide valve ball according to claim 1, characterized in that: In the step S2, the mixed material is pressed into a powder pressing machine to form the nearly spherical green compact (15).

4. The method for manufacturing a cemented carbide valve ball according to claim 3, characterized in that: The powder forming press comprises a semicircular upper punch (12), a semicircular lower punch (13) and a female die (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 female die (14); and the near-spherical compact (15) has a stepped belt (1501).

5. The method for manufacturing a cemented carbide valve ball according to claim 1, characterized in that: In S2, the mixed material is loaded into an elastic spherical soft mold (16) by positive pressure blowing, and then shaped into a cold isostatically pressed green sheet (17) by vibration of the elastic spherical soft mold (16). The cold isostatically pressed green sheet (17) is placed in a cold isostatic press and press-formed, thereby being pressed into the nearly spherical green sheet (15).

6. The method for manufacturing a cemented carbide valve ball according to claim 1, characterized in that: In the step S3, the nearly spherical compact (15) is processed into the standard spherical compact by a semi-processing device.

7. Semi-processing equipment for the method for manufacturing a cemented carbide valve ball according to any one of claims 1 to 6, characterized in that: It comprises a clamping assembly, a workbench (6) and a processing assembly; the clamping assembly and the workbench (6) are respectively and overall bilaterally symmetrical structures; The clamping assembly comprises a top plate (5), a compression cylinder (4) is respectively provided on the left and right sides of the top of the top plate (5), and a push rod assembly is respectively provided on the left and right sides of the bottom of the top plate (5), and the push rod assembly comprises an upper push rod (3) and a lower push rod (1) which are vertically aligned, the top of the upper push rod (3) is connected to the bottom of the top plate (5), and the bottom of the upper push rod (3) and the top of the lower push rod (1) are used to clamp the nearly spherical compact (2); The workbench (6) is arranged on the top of the base (7), and the bottom of the base (7) is connected to the ground (8); The workbench (6) is a rotary double-station workbench, and a workstation (601) is symmetrically arranged on the left and right sides of the top of the workbench (6), and the workstation (601) located on the same side is connected to the bottom of the lower push rod (1); A transverse feed guide rail (11) is provided on the ground (8), the bottom of the processing component is slidably connected to the transverse feed guide rail (11), a center height adjustment guide rail (10) is provided on the side of the processing component facing the clamping component, and a tool (9) corresponding to the work station (601) is slidably connected to the center height adjustment guide rail (10); During implementation, the lateral position of the processing component and the tool (9) relative to the clamping component or the workbench (6) is adjusted by the lateral feed guide rail (11), and the longitudinal position of the tool (9) relative to the clamping component or the workbench (6) is adjusted by the center height adjustment guide rail (10), so that the tool (9) is aligned with the corresponding nearly spherical compact (2), thereby realizing the processing of the nearly spherical compact (2) by the tool (9), and finally processing the nearly spherical compact (2) into the standard spherical compact by the tool (9); The two workstations (601) are respectively used as the clamping workstation and the processing workstation in rotation. When the tool (9) processes the first nearly spherical pressed green sheet (2) above the processing workstation, the clamping assembly above the clamping workstation clamps the second nearly spherical pressed green sheet (2). After the tool (9) has finished processing the first nearly spherical pressed green sheet (2), the clamping workstation has completed the work of clamping the second nearly spherical pressed green sheet (2). Then the workbench (6) rotates the two workstations (601) by 180°, thereby completing the rotation of the clamping workstation and the processing workstation. At this time, the new processing workstation is the original clamping workstation and the new clamping workstation is the original processing workstation. The tool (9) continues to process the second nearly spherical pressed green sheet (2) on the new processing workstation. Similarly, the new clamping workstation continues to clamp the third nearly spherical pressed green sheet (2), and the cycle is repeated. During the machining process of the tool (9), the adjacent clamping components rotate accordingly, thereby ensuring that the spherical surface of the nearly spherical compact (2) is machined evenly.

8. The semi-processing equipment according to claim 7, characterized in that: The compression cylinder (4) is a compressed air cylinder.

9. The semi-processing equipment according to claim 7, characterized in that: The tool (9) is made of a crescent-shaped tool.

10. The semi-processing equipment according to claim 7, characterized in that: The tool (9) is made of PCD material; the semi-processing equipment is controlled by a numerical control programming program to achieve automated processing.

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