High-precision valve body forging forming process and device

Abstract

The invention relates to the technical field of valve body forging equipment, in particular to a high-precision valve body forging forming device and process, and aims at achieving automation of the whole process of sand mold preparation, cooling, compaction, mold closing and pouring through linkage of a stirring structure and a pressing vibration and turnover mechanism. The device comprises a feeding box, a cooling cylinder, a left mold base, a right mold base, an overturning structure and a pressing and vibrating structure, a stirring structure synchronously drives compacting and vibrating through a belt, a transmission rod drives a cam to vibrate the mold bases, meanwhile, a main force rod on the belt pushes a stress rod in a semi-ring groove to be lifted and then instantaneously falls to compact sandy soil, and air holes are eliminated; the cooling cylinder adopts the design of multiple layers of cooling branch pipes and inclined flow channels, and the sand cooling path is prolonged; the overturning structure achieves precise mold closing of the mold base through a gear-push rod mechanism, the process integrates the steps of sand heating and cooling, vibration compaction, chemical hardening and mold closing pouring, the size precision and compactness of the valve body are remarkably improved, and the sand hole defect is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of valve body forging equipment, and specifically discloses a high-precision valve body forging forming process and device. Background Art

[0002] As the core component of the fluid control system, the valve body has a complex internal flow channel structure and extremely high sealing surface precision requirements (usually need to reach IT8 level). The traditional forging process has the following defects: Sand mold preparation problems: Artificial sand filling and compaction lead to uneven density of sand molds, and the penetration of molten metal during pouring produces "sand holes" (the industry scrap rate is about 5% to 8%). The cooling efficiency of sand is low (natural cooling requires ≥30 minutes), and the uneven temperature causes cavity deformation, affecting the dimensional accuracy of the valve body flow channel.

[0003] Process separation defects: Sand mold making, mold closing, and pouring were carried out in steps. Multiple handling caused the sand mold to be misaligned (misalignment > 0.5mm). After mold closing, the mold cavity shifted, resulting in excessive deviation in the valve body wall thickness. The vibration compaction and pouring systems are independent and cannot eliminate the micropores inside the sand mold in real time.

[0004] Energy consumption and efficiency bottlenecks: Sand mold hardening relies on high-temperature baking (which accounts for more than 40% of energy consumption), and the coverage rate of manual spraying of chemical hardeners is less than 60%.

[0005] Therefore, in view of this, the inventor provides a high-precision valve body forging process and device to solve the above problems. Summary of the Invention

[0006] The present invention aims to provide a process and device for high-precision valve body forging. Through innovative designs of sand processing, compaction, mold closing, and casting, the accuracy and quality of valve body forging can be effectively improved, casting defects can be reduced, production efficiency can be improved, production costs can be reduced, and the automation and efficient production of valve body forging can be realized.

[0007] In order to achieve the above-mentioned purpose, the basic scheme of the present invention provides a high-precision valve body forging process and device, including a feeding box with a stirring structure inside, a cooling part for cooling sand, a left mold base and a right mold base for receiving sand to form a valve body mold, a flipping structure for flipping the left mold base and the right mold base so that the left mold base and the right mold base overlap for casting and forming, and a pressure-vibration structure driven by the stirring structure to intermittently vibrate and compact the sand. The feeding part includes a feeding hopper and a discharge pipe, the cooling part is a cooling cylinder provided at the discharge end of the feeding hopper, and a cold delivery pipe for conveying sand to the corresponding upper and lower mold bases is provided at the bottom of the cooling pipe. The pressure-vibration structure includes a guide plate provided on one side of the upper and lower mold bases and provided with a semi-annular groove, a pressure plate slidably connected in the semi-annular groove for compacting sand, a transmission part driven by the stirring structure to intermittently press down the sand, and a vibrating part for intermittently vibrating the upper and lower mold bases.

[0008] Furthermore, both ends of the cooling cylinder are connected to circulation pipes for cooling water circulation. The cooling pipe includes a number of cooling branch pipes arranged from the inside to the outside and filled with cooling water. Flow channels for the flow of heated sand are provided between adjacent cooling branch pipes, and a number of falling inclined plates for buffering are provided in the flow channels.

[0009] Furthermore, a collection box for collecting excess sand and soil is provided at the bottom of the left and right mold bases. The stirring structure includes a servo motor provided on one side of the collection box, a transmission rod coaxially connected to the output shaft of the servo motor, a driving gear coaxially connected to the transmission rod, a belt meshed with the driving gear, a driven gear meshed at the other end of the belt, and a stirring shaft coaxially connected to the driven gear and rotatably connected to the feeding box. A heating element for heating sand and soil is provided in the feeding box, and a liquid storage tank heated by the heating element is also provided on one side of the feeding box. The liquid storage tank is provided with high-temperature and high-pressure molten metal for casting the left and right mold bases.

[0010] Furthermore, a stress rod is slidably connected in the semi-annular groove, and the pressure plate is arranged at the bottom of the stress rod. It is characterized in that the transmission part includes a main rod arranged on the belt and capable of pushing the stress rod, and the semi-annular groove includes an arc-shaped portion and a vertical portion connected to both ends of the arc-shaped portion. The main rod can push the stress rod to slide along the arc-shaped portion for lifting. The stress rod is provided with a disengagement structure for disengaging from the main rod when the stress rod is located at the highest point of the arc-shaped portion. After disengaging from the main rod, the stress rod falls along the vertical portion, thereby driving the pressure plate to compact the sand.

[0011] Furthermore, the disengagement structure includes a slider slidably connected in the semi-annular groove, and a return spring arranged in the slider and connected to the stress rod.

[0012] Furthermore, the transmission rod is rotatably connected to the inner wall of the collection box, and the rapping member includes a plurality of cam blocks coaxially connected to the transmission rod and a plurality of stress blocks arranged at the bottom of the left mold base and the right mold base.

[0013] Furthermore, the flipping structure includes a rocker fixedly connected to the left and right mold bases, a second transmission gear provided at the other end of the rocker and rotatably connected to the collection box, a third transmission gear meshing with the corresponding second transmission gear, and an electric push rod for driving the third transmission gear to slide vertically.

[0014] Furthermore, a spray box for spraying a chemical hardener is provided on the side wall of the collection box.

[0015] Furthermore, the process comprises the following steps: S001: Sand and adhesive are put into the feeding box in a ratio of 10:1. The mixing structure and the heating element are used to stir and heat the sand and adhesive. The sand is then dropped through the feeding pipe to the cooling element. At the same time, the high-temperature and high-pressure molten metal is preheated by the heating element. S002: The heated sand is fully cooled through the flow channel of the cooling cylinder and falls to the left and right mold bases through the cooling pipes; S003: The servo motor starts to make the pressure-vibration structure perform intermittent compaction and vibration to prevent the occurrence of air holes and sand holes; S004: After compacting the sand, wait for the sand to cool and form, and then harden it through the spray box; S005: After hardening, the left mold base and the right mold base are closed by flipping the structure, and high-temperature and high-pressure molten metal is poured, and the valve body is cooled and formed; S006: Polishing by grinding the structure.

[0016] The principles and effects of this basic solution are: 1. Revolutionary improvement in sand mold quality Cooling-compacting coordinated control: The multi-layer cooling pipes and inclined flow channel design in the cooling cylinder make the sand fall in an "S-shape" in the flow channel (the contact area increases by 70%). Combined with the inclined plate buffer, the cooling time is extended and the effect is better. Mixing structure linked pressure and vibration: the servo motor drives the main rod (compaction) and the cam (vibration) synchronously through the belt. The pressure plate compacts at a certain frequency, while the cam vibrates the sand at a high frequency, which greatly improves the uniformity of the sand mold density.

[0017] 2. Breakthrough in mold clamping precision and automation Anti-dislocation and flipping mechanism: Driven by the electric push rod, the rocker-gear group forces the left / right mold base to flip and close the mold along a fixed trajectory, thereby achieving precise mold closing; The collection box is integrated with a spray box, which automatically sprays the hardener before mold closing, replacing manual operation.

[0018] 3. Energy efficiency and cost optimization Heat energy recycling: The heating element of the feeding box preheats the sand and molten metal at the same time, reducing the pouring temperature requirement and energy consumption; Integrated structure reduces consumption: A single servo motor synchronously drives stirring, compacting, and vibration, and cooperates with electric push rods to close the mold. This reduces equipment power consumption, saves floor space, and reduces the probability of work-related injuries caused by manual operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 The figure shows an overall schematic diagram of a high-precision valve body forging process and apparatus proposed in an embodiment of the present application; Figure 2 A schematic diagram of a cooling member of a high-precision valve body forging process and apparatus proposed in an embodiment of the present application is shown; Figure 3 A schematic diagram of a guide plate of a high-precision valve body forging process and apparatus proposed in an embodiment of the present application is shown; Figure 4 A schematic diagram of a telescopic part of a high-precision valve body forging process and apparatus proposed in an embodiment of the present application is shown; Figure 5 A schematic diagram of a telescopic part of a high-precision valve body forging process and device proposed in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0021] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0022] The figure marks in the drawings of the specification include: feeding box 1, feeding pipe 101, liquid storage tank 2, liquid storage pipe 201, cooling cylinder 3, cooling branch pipe 301, flow channel 302, sand 4, cold delivery pipe 5, circulation pipe 6, mounting plate 7, guide plate 8, main rod 801, stress rod 802, semi-annular groove 803, slider 804, return spring 805, servo motor 9, driving gear 10, belt 11, stirring shaft 12, transmission rod 13, extension rod 14, pressure plate 15, blanking trough 1501, guide platform 1502, cam block 16, spray box 17, electric push rod 18, rocker 19, collecting tank 20, second transmission gear 21, and third transmission gear 22.

[0023] A high-precision valve body forging process and device, for example Figure 1 The present invention provides a high-precision valve body forging device and process, comprising, arranged from top to bottom, a feed box 1 with a stirring structure inside, a cooling element for cooling sand 4, left and right die bases for receiving the sand 4 to form the valve body, a turning structure for turning the left and right die bases so that they overlap for casting and forming, and a compressive vibration structure driven by the stirring structure to intermittently vibrate and compact the sand 4. A mounting plate 7 is fixedly mounted on the bottom of the feed box 1, and the cooling element is fixedly mounted on the mounting plate 7. The feeding member includes a feeding hopper and a feeding pipe 101 connected to the bottom of the feeding hopper, and the top of the cooling member is directly opposite to the feeding pipe 101. Figure 2 The cooling element is a cooling cylinder 3 located at the discharge end of the hopper. A cooling pipe 5 connects to the bottom of the cooling pipe, delivering sand 4 to the corresponding left and right mold bases. A circulation pipe 6 for cooling water circulation connects to each end of the cooling cylinder 3. The cooling pipe comprises several cooling branch pipes 301 arranged from the inside out and filled with cooling water. Flow channels 302 for the heated sand 4 flow through adjacent cooling branch pipes 301. Within these flow channels 302 are multiple inclined plates to cushion the flow. This cooling structure ensures that the heated sand 4 fully exchanges heat with the cooling branch pipes 301 within the flow channels 302, achieving rapid cooling. The inclined plates also slow the sand 4's descent, further ensuring effective cooling. The pressure-vibration structure includes a guide plate 8 mounted on the left side of the left and right mold bases and having a semi-annular groove 803 formed therein; a pressure plate 15 slidably mounted within the semi-annular groove 803 for compacting the sand 4; a transmission member driven by the mixing structure to intermittently press down the sand 4; and a vibration member that intermittently vibrates the left and right mold bases. A collection box for collecting excess sand 4 is located at the bottom of each mold base, and a collection trough 20 is formed on the collection box, located below the left and right mold bases. The stirring structure includes a servo motor 9 installed on the left inner wall of the collecting box, a transmission rod 13 coaxially connected to the output shaft of the servo motor 9, a driving gear 10 coaxially connected to the transmission rod 13, a belt 11 meshing with the driving gear 10, a driven gear meshing at the other end of the belt 11, and a stirring shaft 12 coaxially connected to the driven gear and rotatably connected to the feeding box 1. A heating element for heating the sand 4 is provided in the feeding box 1. The heating element is an existing heating element. A liquid storage tank 2 heated by the heating element is also provided on the right side of the feeding box 1. The liquid storage tank 2 is filled with high-temperature and high-pressure molten metal for pouring the left and right mold bases. The bottom of the liquid storage tank 2 is connected to a liquid storage pipe 201 for pouring, which is preheated by the heating element. like Figure 3 A stress rod 802 is slidably installed in the semi-annular groove 803, the bottom of the stress rod 802 is fixedly connected to the extension rod 14, and the pressure plate 15 is fixedly installed at the bottom of the extension rod 14. Figure 4A blanking chute 1501 is provided on the top of the pressing plate 15 for the sand 4 to flow into the left and right mold seats. Guide platforms 1502 are provided on both sides of the blanking chute 1501 for guiding the sand 4 to be blanked. The guide platforms 1502 are inclined to facilitate continued blanking during the compaction process.

[0024] like Figure 5 The transmission part includes a main rod 801 installed on the belt 11 and capable of pushing the stress rod 802. The semi-annular groove 803 includes an arc-shaped portion and a vertical portion connected to both ends of the arc-shaped portion. The main rod 801 can push the stress rod 802 to slide along the arc-shaped portion for lifting. The stress rod 802 is provided with a detachment structure for detaching from the main rod 801 when the stress rod 802 is at the highest point of the arc-shaped portion. After detaching from the main rod 801, the stress rod 802 falls along the vertical portion, thereby driving the pressure plate 15 to compact the sand 4. The disengagement structure includes a slider 804 slidably installed in the semi-annular groove 803, and a return spring 805 arranged in the slider 804 and connected to the stress rod 802. When the main rod 801 pushes the stress rod 802 to the top of the arc portion, since the main rod 801 continues to move upward, the stress rod 802 is abutted against the inner wall of the semi-annular groove 803, so that the stress rod 802 compresses the return spring 805, so that the stress rod 802 is separated from the main rod 801 and the sand 4 is compacted once.

[0025] The rapping mechanism includes multiple sets of cam blocks 16 coaxially mounted on the transmission rod 13 and multiple sets of stress blocks located at the bottom of the left and right mold bases. When the transmission rod 13 rotates, the cam blocks 16 intermittently strike the stress blocks, thereby rapping the left and right mold bases and further improving the compaction of the sand 4. The flipping mechanism includes a rocker 19 fixed to each of the left and right mold bases; a second transmission gear 21, located at the other end of the rocker 19 and rotationally connected to the collection box; a third transmission gear 22 meshing with the corresponding second transmission gear 21; and an electric push rod 18 for vertically sliding the third transmission gear 22. The electric push rod 18 pushes the third transmission gear 22 vertically, driving the second transmission gear 21 to rotate, thereby flipping and closing the left and right mold bases. Furthermore, a spray box 17 for spraying a chemical hardener is located on the right side wall of the collection box. This hardens the formed sand 4 and enhances its strength. The electric push rod 18 is preferably controlled in conjunction with the servo motor 9 via a controller.

[0026] Based on the above device, the present invention also provides a high-precision valve body forging process, comprising the following steps: S001: Sand 4 and adhesive are placed into the feeding box 1 in a ratio of 10:1. The mixture is stirred and heated using a stirring mechanism and a heating element. The mixture then falls through a discharge pipe 101 to a cooling element, where the heating element simultaneously preheats the high-temperature, high-pressure molten metal. In this step, the stirring mechanism ensures thorough mixing of the sand 4 and adhesive, while the heating element heats the sand 4 to the appropriate temperature for subsequent cooling and shaping. The preheated molten metal ensures fluidity during pouring. S002: After heating, the sand 4 is fully cooled through the flow channel 302 of the cooling cylinder 3 and falls through the cooling pipe to the left and right mold bases. The unique design of the cooling pipe 301 and flow channel 302 of the cooling cylinder 3 ensures rapid and uniform cooling of the sand 4, laying the foundation for high-quality sand mold formation. S003: The servo motor 9 starts to intermittently compact and vibrate the pressure-vibration structure to prevent the formation of air holes and sand holes. The pressure-vibration structure compacts and vibrates the sand 4 through the coordinated action of the transmission parts and the vibrating parts, effectively improving the compactness of the sand 4 and reducing casting defects. S004: After compacting the sand 4, the sand 4 is cooled and formed, and hardened by the spray box 17. Spraying a chemical hardener can enhance the strength of the sand mold and ensure the stability of the sand mold during the subsequent pouring process. S005: After hardening, the left and right mold bases are closed by flipping the mold mechanism, and high-temperature, high-pressure molten metal is poured. The valve body is then cooled and formed. Precise flipping and closing the mold and stable pouring process ensure the molding accuracy and quality of the valve body. S006: Grind the valve body through the grinding structure to remove burrs and uneven parts on the surface, so that the valve body can reach the final precision requirements.

[0027] The use process of the present invention is as follows: In actual production, sand 4 and adhesive are first accurately placed in a 10:1 ratio into feeding box 1. The heating element and stirring mechanism within feeding box 1 are activated, and stirring shaft 12, driven by servo motor 9, rotates. Drive gear 10 drives belt 11, which in turn drives driven gear, causing stirring shaft 12 to stir and heat the sand 4 and adhesive, thereby heating the sand 4. Simultaneously, the high-temperature, high-pressure molten metal within liquid storage tank 2 is also preheated by the heating element. The heated sand 4 enters the cooling drum 3 through the discharge pipe 101. Inside the cooling drum 3, the sand 4 flows along the flow channel 302, exchanging heat with the cooling water circulating in the cooling branch pipe 301. The inclined plates within the flow channel 302 slow the sand 4's descent. After a period of time, the sand 4 cools to a suitable mold forming temperature and is evenly transported to the left and right mold bases via the cold delivery pipe 5. At this time, the servo motor 9 continues to operate, and the main rod 801 on the belt 11 pushes the stress rod 802 to slide and lift along the arc portion of the semi-annular groove 803. When the stress rod 802 reaches the highest point of the arc portion, the slider 804 and the return spring 805 of the disengagement structure act to separate the stress rod 802 from the main rod 801 and fall along the vertical portion, driving the pressure plate 15 to compact the sand 4. At the same time, the cam block 16 on the transmission rod 13 intermittently hits the stress blocks at the bottom of the left and right mold bases, vibrating the mold bases and making the sand 4 more compact. After compacting the sand 4, wait for a period of time until the sand 4 is initially cooled and formed, and then start the spray box 17 to spray the chemical hardener onto the surface of the sand mold to further harden the sand mold. After hardening is completed, the electric push rod 18 is started, which pushes the third transmission gear 22 to slide vertically, driving the second transmission gear 21 to rotate, thereby causing the left and right mold bases to flip and close the mold via the rocker 19. Subsequently, the high-temperature and high-pressure molten metal preheated in the liquid storage tank 2 is poured into the mold cavity after the mold is closed, and the valve body is cooled and formed. Finally, the polishing mechanism polishes the formed valve body to remove surface burrs and unevenness, resulting in a high-precision valve body product. Testing has shown that the valve body's dimensional accuracy, strength, and sealing properties all meet the requirements. The advantages of the present invention are as follows: Improved molding precision: The unique cooling element design of this invention achieves precise control of the sand 4 temperature, ensuring uniform cooling of the sand 4, thus providing a guarantee for high-quality sand mold formation. At the same time, the intermittent compaction and vibration of the pressure-vibration structure effectively improves the compactness of the sand 4, reduces defects such as pores and sand holes, and greatly improves the molding precision of the valve body. Guaranteed product quality: The interplay of various components within the device optimizes the entire process, from mixing, heating, cooling, and compacting the sand 4 to mold closing and casting. In particular, the precise positioning and stable mold closing provided by the flip mechanism, along with the hardening of the sand mold by the spray chamber 17, ensures mold stability during casting, effectively preventing valve body defects caused by mold defects and thus guaranteeing product quality. Improved production efficiency: This invention automates the entire process from sand processing (4) to valve body molding, reducing manual intervention and labor intensity. The servo motor (9)-driven stirring mechanism, the pressure-vibration mechanism, and the electric push rod (18)-controlled flip mechanism work together to improve production continuity and efficiency, meeting the needs of large-scale production. Reduce production costs: Automated production reduces labor costs. At the same time, by improving product quality and molding accuracy, it reduces scrap rate and reduces the waste of raw materials, thereby effectively reducing production costs.

[0028] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make some changes or modifications to equivalent embodiments using the technical contents disclosed above. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A high-precision valve body forging device, characterized in that: It includes a feeding box with a stirring structure inside, a cooling part for cooling sand, a left mold base and a right mold base for receiving sand to form a valve body, a flipping structure for flipping the left mold base and the right mold base so that the left mold base and the right mold base overlap for casting and forming, and a pressure vibration structure driven by the stirring structure to intermittently vibrate and compact the sand. The feeding part includes a feeding hopper and a discharge pipe. The cooling part is a cooling cylinder provided at the discharge end of the feeding hopper. A cold delivery pipe for conveying sand to the corresponding upper and lower mold bases is provided at the bottom of the cooling pipe. The pressure vibration structure includes a guide plate provided on one side of the upper and lower mold bases and provided with a semi-annular groove, a pressure plate slidably connected in the semi-annular groove for compacting sand, a transmission part driven by the stirring structure to intermittently press down the sand, and a vibrating part for intermittently vibrating the upper and lower mold bases.

2. A high-precision valve body forging device according to claim 1, characterized in that: Both ends of the cooling cylinder are connected to a circulation pipe for cooling water circulation. The cooling pipe includes a number of cooling branch pipes arranged from the inside to the outside and filled with cooling water. A flow channel for the flow of heated sand is provided between adjacent cooling branch pipes, and a number of falling inclined plates for buffering are provided in the flow channel.

3. A high-precision valve body forging device according to claim 1, characterized in that: A collection box for collecting excess sand and soil is provided at the bottom of the left and right mold bases. The stirring structure includes a servo motor provided on one side of the collection box, a transmission rod coaxially connected to the output shaft of the servo motor, a driving gear coaxially connected to the transmission rod, a belt meshed with the driving gear, a driven gear meshed at the other end of the belt, and a stirring shaft coaxially connected to the driven gear and rotatably connected to the feeding box. A heating element for heating sand and soil is provided in the feeding box, and a liquid storage tank heated by the heating element is also provided on one side of the feeding box. The liquid storage tank is provided with high-temperature and high-pressure molten metal for casting the left and right mold bases.

4. A high-precision valve body forging device according to claim 3, wherein a stress rod is slidably connected in the semi-annular groove, and the pressure plate is arranged at the bottom of the stress rod, characterized in that: The transmission part includes a main rod arranged on the belt and capable of pushing the stress rod. The semi-annular groove includes an arc-shaped portion and a vertical portion connected to both ends of the arc-shaped portion. The main rod can push the stress rod to slide along the arc-shaped portion for lifting. The stress rod is provided with a disengagement structure that disengages from the main rod when the stress rod is at the highest point of the arc-shaped portion. After disengaging from the main rod, the stress rod falls along the vertical portion, thereby driving the pressure plate to compact the sand.

5. A high-precision valve body forging process and apparatus according to claim 4, characterized in that: The disengagement structure includes a slider slidably connected in the semi-annular groove, and a return spring arranged in the slider and connected to the stress rod.

6. A high-precision valve body forging device according to claim 3, characterized in that: The transmission rod is rotatably connected to the inner wall of the collection box, and the rapping member includes a plurality of cam blocks coaxially connected to the transmission rod and a plurality of stress blocks arranged at the bottom of the left mold base and the right mold base.

7. A high-precision valve body forging device according to claim 3, characterized in that: The flip structure includes a rocker fixed to the left and right mold bases respectively, a second transmission gear provided at the other end of the rocker and rotatably connected to the collection box, a third transmission gear meshing with the corresponding second transmission gear, and an electric push rod for driving the third transmission gear to slide vertically.

8. A high-precision valve body forging device according to claim 7, characterized in that: The side wall of the collection box is further provided with a spray box for spraying a chemical hardener.

9. The high-precision valve body forging device according to claim 1, characterized in that: A material dropping chute for dropping sand and soil is provided on the top of the pressing plate, and guide platforms for guiding the dropping of sand and soil are provided on both sides of the material dropping chute.

10. A high-precision valve body forging process and apparatus according to any one of claims 1 to 9, characterized in that: The following steps are involved: S001: Sand and adhesive are placed in a 10:1 ratio into the feeding box, stirred and heated by the stirring structure and the heating element, and then dropped through the feeding pipe to the cooling element, while the high-temperature and high-pressure molten metal is preheated by the heating element; S002: The heated sand is fully cooled through the flow channel of the cooling cylinder and falls to the left and right mold bases through the cooling pipes; S003: The servo motor starts to make the pressure-vibration structure perform intermittent compaction and vibration to prevent the occurrence of air holes and sand holes; S004: After compacting the sand, wait for the sand to cool and form, and then harden it through the spray box; S005: After hardening, the left mold base and the right mold base are closed by flipping the structure, and high-temperature and high-pressure molten metal is poured, and the valve body is cooled and formed; S006: Polishing by grinding the structure.

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