High-strength anti-oxidation precision casting and casting process thereof

Abstract

The invention discloses a high-strength anti-oxidation precision casting and a casting process thereof, and belongs to the technical field of precision casting machining, the high-strength anti-oxidation precision casting comprises a valve body, a valve rod and a water hammer prevention valve element mechanism on the valve rod are rotationally connected in the valve body, and the water hammer prevention valve element mechanism comprises a first valve plate and a second valve plate; a pressure relief assembly is arranged in a cavity formed by the first valve plate and the second valve plate, protective noise reduction parts are arranged in grooves in the outer sides of the first valve plate and the second valve plate correspondingly, and anti-impact drum pieces are arranged on the sides, away from the valve plates, of the two protective noise reduction parts correspondingly. Pressure waves generated by a water hammer can be effectively absorbed and dispersed, so that the valve plate is prevented from being directly impacted by high-strength pressure, abrasion and fatigue of the valve plate caused by frequent impact of the water hammer are reduced, the service life of the valve plate is prolonged, the valve plate is prevented from possibly deforming or shifting when impacted by the water hammer, and the sealing performance is improved.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of precision casting processing, and specifically relates to a high-strength anti-oxidation precision casting and a casting process thereof. Background Art

[0002] Precision castings are produced through the precision casting process, which requires high precision, high quality and high efficiency. It is widely used in aviation, aerospace, automobile and energy fields, and is particularly suitable for the production of complex shapes and high-precision castings. The basic principle of precision casting is to pour liquid metal into a pre-prepared mold, and demold the metal after it cools and solidifies to obtain a casting of the desired shape. Compared with traditional casting, precision casting has higher requirements in mold making, smelting process, pouring process and heat treatment.

[0003] Common precision castings mainly include valve bodies, impellers, pistons, connecting rods, gearbox gears, turbochargers, radiators, pump bodies, impellers, flanges, bearings and fasteners. During the use of the valve body, if the valve body is closed, the fluid in the pipeline will be affected by the start and stop of the pump body or other human operations, resulting in an instantaneous change in the pressure in the pipeline, causing a water hammer effect and instantaneous pressure fluctuations. The high-pressure fluctuations caused by the water hammer may cause the valve plate to be subjected to a pressure exceeding its design bearing capacity, which may lose its sealing performance, causing valve leakage, and even deformation, rupture or falling off, shortening the service life. The rapid pressure changes caused by the water hammer will generate noise and vibration, which will not only damage the valve plate, but also affect the safety of surrounding equipment and structures. At present, the treatment of the water hammer effect is mostly to add additional anti-water hammer structures in the pipeline, such as accumulators, which not only increases the cost, but also makes the pipeline more complicated, and is not suitable for complex pipeline distribution in a small space. Summary of the invention

[0004] The technical solution of the present invention aims at the technical problem that the existing technical solutions are too single, and provides a solution that is significantly different from the existing technologies. Specifically, the present invention mainly provides a high-strength anti-oxidation precision casting and its casting process, which is used to solve the technical problem raised in the above background technology that when the valve body is used to close the pipeline, the water hammer effect sometimes generated in the pipeline will cause the valve plate to be subjected to pressure exceeding its design tolerance capacity, causing damage.

[0005] The technical solution adopted by the present invention to solve the above technical problems is: A high-strength, oxidation-resistant precision casting comprises a valve body, a valve stem is rotatably connected in the valve body, a water-proof hammer valve core mechanism is arranged on the valve stem, the water-proof hammer valve core mechanism comprises a first valve plate and a second valve plate, the first valve plate and the second valve plate are connected by threads, and the valve stem passes through two upper and lower circular holes of the first valve plate, a pressure relief assembly is arranged in the cavity formed by the first valve plate and the second valve plate, protective noise reduction parts are arranged in the grooves on the outer sides of the first valve plate and the second valve plate, and anti-impact drum plates are arranged on the side of the two protective noise reduction parts away from the valve plates.

[0006] Preferably, the pressure relief assembly includes a sleeve, which is provided with two arc-shaped protrusions, and the two arc-shaped protrusions are centrally symmetrical. The sleeve is sleeved on the valve stem, and the upper and lower ends of the sleeve are provided with pressure relief torsion springs, which are sleeved on the valve stem. The upper end of the pressure relief torsion spring located on the upper side of the sleeve is clamped with the upper side of the inner wall of the first valve plate, and the lower end of the pressure relief torsion spring located on the lower side of the sleeve is clamped with the lower side of the inner wall of the first valve plate.

[0007] Preferably, the outer edges of the two arc-shaped protrusions on the sleeve are in contact with a receiving plate, and each receiving plate is provided with two connecting rods. The front end of each connecting rod passes through the circular hole on the valve plate and is threadedly connected to the corresponding impact-resistant drum plate.

[0008] Preferably, each of the connecting rods is provided with a pressure relief spring, and two ends of the pressure relief spring are respectively connected to the outer side of the corresponding receiving plate and the inner wall of the valve plate.

[0009] Preferably, each of the protective noise reduction components comprises an activated carbon plate and a porous plate, and the activated carbon plate is embedded on the back of the porous plate.

[0010] Preferably, each of the porous plates is embedded with an electromagnet, the electromagnet is attracted and connected with an armature ring, the armature ring is embedded in an impact-resistant drum sheet, and a plurality of water-permeable holes are arranged around the outer side of the impact-resistant drum sheet at equal intervals.

[0011] Preferably, a sealing ring is arranged in the groove formed by the first valve plate and the second valve plate.

[0012] A casting process for a high-strength, anti-oxidation precision casting, the casting process for the precision casting specifically comprising the following steps: Step 1: Design and mold preparation. According to the design drawings of the valve body casting, carry out detailed structural design and process design, and manufacture high-precision casting molds. CNC machining technology is usually used to ensure the dimensional accuracy and surface finish of the mold; Step 2: Material selection and smelting. According to the use requirements of the valve body, select the appropriate casting material, melt the selected material to obtain molten metal, and strictly control the smelting temperature and chemical composition to ensure the quality of the melt; Step 3: Modeling and sand mold preparation. Use quartz sand, resin sand and other materials to prepare sand molds. The quality and precision of the sand molds have a direct impact on the quality of the castings. Use a high-pressure molding machine to ensure the compactness and uniformity of the sand molds. Step 4: Casting: inject the molten metal into the prepared mold through the pouring system. During the pouring process, the pouring speed, temperature and sequence must be controlled to avoid casting defects such as pores and slag inclusions. Step 5: Cooling and solidification. The casting is cooled and solidified in the mold. During the cooling process, ensure that the casting is cooled evenly. Step 6: Demolding and cleaning: After the casting has cooled, take it out of the mold, remove the gating system, and polish and remove burrs. The cleaned casting should be inspected for appearance to ensure there are no obvious defects. Step 7: Heat treatment and surface treatment. According to the performance requirements of the valve body, appropriate heat treatment, such as tempering and quenching, is carried out to improve the mechanical properties of the casting. Surface treatment may include grinding, polishing and painting to improve the corrosion resistance and appearance quality of the casting. Step 8: Inspection and testing: perform dimensional inspection and non-destructive testing on the castings to ensure that the castings meet the design requirements, and then perform pressure testing and sealing tests; Step 9: Assemble and debug. Assemble the processed valve body, valve stem and anti-water hammer valve core mechanism, and debug them to ensure that the overall performance of the valve meets the requirements.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a valve body, a valve stem, a sealing ring and an anti-water hammer valve core mechanism, so that after the valve is closed, the first valve plate, the second valve plate, the electromagnet and the armature ring cooperate with each other to expand the impact-resistant drum plate. When the fluid pressure in the pipeline changes instantaneously, the pressure wave generated by the water hammer can be effectively absorbed and dispersed, thereby protecting the valve plate from the direct impact of high-intensity pressure, reducing the wear and fatigue of the valve plate caused by frequent water hammer impacts, extending the service life of the valve plate, preventing the valve plate from being deformed or shifted when impacted by water hammer, improving the overall sealing performance of the valve, avoiding the need for additional anti-water hammer structures, such as accumulators, in the pipeline in existing equipment, reducing the overall cost, optimizing the pipeline distribution structure, and being more in line with the complex pipeline distribution in a small space. (2) The present invention realizes efficient pressure relief and buffering by providing a receiving plate, a connecting rod, an arc-shaped protrusion, a pressure relief spring, an anti-impact drum plate, a pressure relief torsion spring and a sleeve. When the anti-impact drum plate is impacted by water flow, the double deformation effect of the linear deformation of the pressure relief spring and the rotational deformation of the pressure relief torsion spring is used, thereby further improving the valve plate's resistance to water flow impact, more effectively coping with the problem of frequent water hammer impact, better adapting to pipelines with frequent water pressure changes, reducing valve plate wear and fatigue, and ensuring the sealing of the valve plate.

[0014] (3) The present invention realizes that the mesh structure can play a certain damping role through the porous plate in the protective noise reduction component, so that the pressure wave energy passing through the mesh is attenuated, thereby reducing the intensity of the water hammer wave. The mesh structure can force the fluid to disperse when passing through, which helps to smooth the rapid changes in fluid velocity and reduce water hammer caused by sudden changes in flow velocity. At the same time, it reduces noise and vibration, avoids damage to the surrounding environment and equipment, and saves maintenance costs. The structure is integrated, stable and durable. The activated carbon plate can adsorb fine sand, dust, soil and other suspended particles in the fluid around the sealing ring to avoid embedding into the gap between the sealing ring and the inner wall of the valve body, damaging the sealing ring and affecting the sealing performance.

[0015] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the overall structure decomposition of the present invention; Figure 3 It is an exploded schematic diagram of the anti-water hammer valve core mechanism of the present invention; Figure 4 It is a schematic diagram of the decomposition of the pressure relief assembly of the present invention.

[0017] In the figure: 1. valve body; 2. valve stem; 3. anti-water hammer valve core mechanism; 31. first valve plate; 32. second valve plate; 33. protective noise reduction component; 331. activated carbon plate; 332. porous plate; 34. impact-resistant drum plate; 341. water-permeable hole; 35. electromagnet; 36. armature ring; 4. pressure relief assembly; 41. sleeve; 411. arc-shaped protrusion; 42. receiving plate; 43. connecting rod; 44. pressure relief spring; 45. pressure relief torsion spring; 5. sealing ring. DETAILED DESCRIPTION

[0018] To facilitate understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings, but the present invention can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the content disclosed in the present invention more thorough and comprehensive.

[0019] It should be noted that when an element is referred to as being "fixed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this article are for illustrative purposes only.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly connected by technicians in the technical field to which the present invention belongs. The terminology used in the specification of the present invention is for the purpose of describing specific embodiments and is not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0021] Example 1, please refer to the attached Figure 1-4 As shown, a high-strength anti-oxidation precision casting includes a valve body 1, in which a valve stem 2 is rotatably connected, and a water-proof hammer valve core mechanism 3 is arranged on the valve stem 2, and the water-proof hammer valve core mechanism 3 includes a first valve plate 31 and a second valve plate 32, the first valve plate 31 and the second valve plate 32 are connected by threads, and the valve stem 2 passes through the upper and lower circular holes of the first valve plate 31, and a pressure relief assembly 4 is arranged in the cavity formed by the first valve plate 31 and the second valve plate 32, and protective noise reduction parts 33 are arranged in the grooves on the outer sides of the first valve plate 31 and the second valve plate 32, and anti-impact drum plates 34 are arranged on the side of the two protective noise reduction parts 33 away from the valve plates.

[0022] Through the above structure, when the fluid pressure in the pipeline changes instantaneously, the pressure wave generated by the water hammer can be effectively absorbed and dispersed, thereby protecting the valve plate from the direct impact of high-intensity pressure, reducing the wear and fatigue of the valve plate caused by frequent water hammer impacts, extending the service life of the valve plate, preventing the valve plate from being deformed or shifted when impacted by water hammer, improving the sealing performance, reducing noise and vibration, avoiding damage to the surrounding environment and equipment, saving maintenance costs, and having an integrated structure that is stable and durable.

[0023] The casting process is as follows: design and mold preparation, according to the design drawings of the valve body 1 casting, carry out detailed structural design and process design, manufacture high-precision casting molds, and usually use CNC machining technology to ensure the dimensional accuracy and surface finish of the mold; material selection and smelting, according to the use requirements of the valve body 1, select suitable casting materials, melt the selected materials to obtain molten metal, strictly control the smelting temperature and chemical composition to ensure the quality of the melt; molding and sand mold preparation, use quartz sand, resin sand and other materials to prepare sand molds. The quality and accuracy of the sand mold have a direct impact on the quality of the casting. A high-pressure molding machine is used to ensure the compactness and uniformity of the sand mold; casting, the molten metal liquid is injected into the prepared mold through the pouring system. During the pouring process, the pouring speed, temperature and sequence must be controlled to avoid the generation of pores, slag inclusions, etc. Casting defects; Cooling and solidification: the casting is cooled and solidified in the mold. During the cooling process, it is necessary to ensure that the casting is cooled evenly; Demolding and cleaning: after the casting is cooled, it is taken out of the mold, and the gating system is removed and the burrs are polished. The casting after cleaning is visually inspected to ensure that there are no obvious defects; Heat treatment and surface treatment: according to the performance requirements of the valve body 1, appropriate heat treatment such as tempering and quenching is carried out to improve the mechanical properties of the casting. Surface treatment may include grinding, polishing and painting to improve the corrosion resistance and appearance quality of the casting; Inspection and testing: the casting is inspected for size and non-destructive testing to ensure that the casting meets the design requirements, and then pressure testing and sealing testing are carried out; Assembly and debugging: the processed valve body 1, valve stem 2 and anti-water hammer valve core mechanism 3 are assembled and debugged to ensure that the overall performance of the valve meets the requirements; When the anti-impact drum piece 34 is impacted by the water flow in the pipeline, the anti-impact drum piece 34 moves toward one side of the protective noise reduction component 33, and the pressure relief spring 44 on the connecting rod 43 is deformed. At the same time, the receiving plate 42 at one end of the connecting rod 43 squeezes the arc-shaped protrusion 411 of the sleeve 41, forcing the sleeve 41 to rotate, thereby deforming the pressure relief torsion spring 45. The deformation of the pressure relief spring 44 and the pressure relief torsion spring 45 weakens the impact force of the water flow. When the valve needs to be opened, the electromagnet 35 is energized, and the anti-impact drum piece 34 is adsorbed into the groove on the outside of the valve piece through the armature ring 36, so that the valve stem 2 can be rotated to open the valve.

[0024] Example 2, please refer to the attached Figure 2 and 3As shown, each of the protective noise reduction components 33 includes an activated carbon plate 331 and a porous plate 332, and the activated carbon plate 331 is embedded in the back of the porous plate 332. Through the protective noise reduction component 33, the pressure wave energy generated by the fluid is attenuated by the mesh structure, thereby reducing the intensity of the water hammer wave, while reducing noise and vibration, and avoiding damage to the surrounding environment and equipment. An electromagnet 35 is embedded in each of the porous plates 332. The electromagnet 35 is suction-connected with an armature ring 36, and the armature ring 36 is embedded in the anti-impact drum sheet 34. A plurality of water-permeable holes 341 are arranged around the outer side of the anti-impact drum sheet 34 at equal intervals. Through the electromagnet 35 and the armature ring 36, the deformation force of the pressure relief spring 44 and the pressure relief torsion spring 45 can be overcome to control the movement of the anti-impact drum sheet 34. A sealing ring 5 is arranged in the groove formed by the first valve sheet 31 and the second valve sheet 32. The sealing ring 5 improves the sealing performance of the connection between the valve core and the inner wall of the valve body 1.

[0025] Example 3, please refer to the attached Figure 3 and 4 As shown, the pressure relief assembly 4 includes a sleeve 41, on which two arc-shaped protrusions 411 are arranged, and the two arc-shaped protrusions 411 are centrally symmetrical. The sleeve 41 is sleeved on the valve stem 2, and the upper and lower ends of the sleeve 41 are both provided with pressure relief torsion springs 45, which are sleeved on the valve stem 2. The upper end of the pressure relief torsion spring 45 located on the upper side of the sleeve 41 is clamped with the upper side of the inner wall of the first valve disc 31, and the lower end of the pressure relief torsion spring 45 located on the lower side of the sleeve 41 is clamped with the lower side of the inner wall of the first valve disc 31. Through the deformation of the pressure relief torsion spring 45, the sleeve 41 is rotated and returned after being subjected to force. The outer edges of the two arc-shaped protrusions 411 on the sleeve 41 are in contact with a receiving plate 42, and each of the receiving plates 42 is provided with two connecting rods 43. The front end of each connecting rod 43 passes through the circular hole on the valve plate and is threadedly connected to the corresponding anti-impact drum plate 34. Each of the connecting rods 43 is provided with a pressure relief spring 44, and the two ends of the pressure relief spring 44 are respectively connected to the outer side of the corresponding receiving plate 42 and the inner wall of the valve plate. Through the mutual cooperation between the connecting rod 43 and the pressure relief spring 44, the water flow force on the anti-impact drum plate 34 is realized to buffer the unloading force.

[0026] The above is an exemplary description of the present invention in combination with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as such non-substantial improvements are made by adopting the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A high-strength, oxidation-resistant precision casting, comprising a valve body (1), wherein a valve stem (2) is rotatably connected to the valve body (1), characterized in that The valve stem (2) is provided with an anti-water hammer valve core mechanism (3), the anti-water hammer valve core mechanism (3) comprises a first valve plate (31) and a second valve plate (32), the first valve plate (31) and the second valve plate (32) are connected by a thread, and the valve stem (2) passes through two upper and lower circular holes of the first valve plate (31), a pressure relief assembly (4) is provided in the cavity formed by the first valve plate (31) and the second valve plate (32), and protective noise reduction components (33) are provided in the grooves on the outer sides of the first valve plate (31) and the second valve plate (32), and anti-impact drum plates (34) are provided on the sides of the two protective noise reduction components (33) away from the valve plates.

2. A high-strength, anti-oxidation precision casting according to claim 1, characterized in that: The pressure relief assembly (4) comprises a sleeve (41), on which two arc-shaped protrusions (411) are arranged, and the two arc-shaped protrusions (411) are centrally symmetrical. The sleeve (41) is sleeved on the valve stem (2), and pressure relief torsion springs (45) are arranged at the upper end and the lower end of the sleeve (41). The pressure relief torsion spring (45) is sleeved on the valve stem (2), and the upper end of the pressure relief torsion spring (45) located on the upper side of the sleeve (41) is clamped with the upper side of the inner wall of the first valve plate (31), and the lower end of the pressure relief torsion spring (45) located on the lower side of the sleeve (41) is clamped with the lower side of the inner wall of the first valve plate (31).

3. A high-strength, anti-oxidation precision casting according to claim 2, characterized in that: The outer edges of the two arc-shaped protrusions (411) on the sleeve (41) are in contact with a receiving plate (42), and each receiving plate (42) is provided with two connecting rods (43). The front end of each connecting rod (43) passes through a circular hole on the valve plate and is threadedly connected to a corresponding anti-impact drum plate (34).

4. A high-strength, anti-oxidation precision casting according to claim 3, characterized in that: A pressure relief spring (44) is provided on each of the connecting rods (43), and two ends of the pressure relief spring (44) are respectively connected to the outer side of the corresponding receiving plate (42) and the inner wall of the valve plate.

5. A high-strength, anti-oxidation precision casting according to claim 1, characterized in that: Each of the protective noise reduction components (33) comprises an activated carbon plate (331) and a porous plate (332), and the activated carbon plate (331) is embedded on the back of the porous plate (332).

6. A high-strength, anti-oxidation precision casting according to claim 5, characterized in that: An electromagnet (35) is embedded in each of the porous plates (332), and the electromagnet (35) is attracted and connected to an armature ring (36). The armature ring (36) is embedded in an impact-resistant drum sheet (34), and a plurality of water-permeable holes (341) are arranged around the outer side of the impact-resistant drum sheet (34) at equal intervals.

7. A high-strength, anti-oxidation precision casting according to claim 2, characterized in that: A sealing ring (5) is arranged in the groove formed by the first valve plate (31) and the second valve plate (32).

8. A casting process for high-strength, anti-oxidation precision castings, characterized in that: The casting process of the precision casting specifically comprises the following steps: Step 1: Design and mold preparation. According to the design drawings of the valve body (1) casting, detailed structural design and process design are carried out to manufacture high-precision casting molds. CNC machining technology is usually used to ensure the dimensional accuracy and surface finish of the molds. Step 2: Material selection and smelting: According to the use requirements of the valve body (1), select suitable casting materials, melt the selected materials to obtain molten metal, and strictly control the smelting temperature and chemical composition to ensure the quality of the melt; Step 3: Modeling and sand mold preparation. Use quartz sand, resin sand and other materials to prepare sand molds. The quality and precision of the sand molds have a direct impact on the quality of the castings. Use a high-pressure molding machine to ensure the compactness and uniformity of the sand molds. Step 4: Casting: inject the molten metal into the prepared mold through the pouring system. During the pouring process, the pouring speed, temperature and sequence must be controlled to avoid casting defects such as pores and slag inclusions. Step 5: Cooling and solidification. The casting is cooled and solidified in the mold. During the cooling process, ensure that the casting is cooled evenly. Step 6: Demolding and cleaning: After the casting cools down, take it out of the mold, remove the gating system, and polish and remove burrs. The cleaned casting should be inspected for appearance to ensure there are no obvious defects. Step 7: Heat treatment and surface treatment. According to the performance requirements of the valve body (1), appropriate heat treatment, such as tempering and quenching, is performed to improve the mechanical properties of the casting. Surface treatment may include grinding, polishing and painting to improve the corrosion resistance and appearance quality of the casting. Step 8: Inspection and testing: perform dimensional inspection and non-destructive testing on the castings to ensure that the castings meet the design requirements, and then perform pressure testing and sealing tests; Step 9: Assemble and debug. Assemble the processed valve body (1), valve stem (2) and anti-water hammer valve core mechanism (3), and debug to ensure that the overall performance of the valve meets the requirements.

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