A precision casting process for stainless steel valve castings

Abstract

The invention relates to the field of valve casting, and discloses a precision casting process for stainless steel valve castings, comprising S1, mold making: pressing wax material into a mold cavity, and taking it out after cooling to form a wax mold; S2, mold repairing: repairing the batch seams, wax injection nozzles and flow lines on the surface of the wax mold; S3, making a mold shell: coating the surface of the wax mold with refractory coating for many times and sprinkling refractory sand material on it, and forming a silica sol mold shell after drying and hardening; S4, dewaxing: melting and discharging the wax in the mold shell by steam, leaving a mold shell with a cavity; S5, shell roasting: used to burn off the residual wax material and moisture; S6, smelting and pouring: smelting molten steel after batching according to product material components, removing slag and performing spectrum test, and pouring in a red shell state to form a casting blank after passing the test; S7, sand cleaning and shelling: after the casting blank is cooled, using a vibration shelling machine to separate the mold shell from the casting blank; S8, finishing inspection; S9, quality inspection: carrying out size and appearance inspection on the finished casting blank, and putting it into storage after passing the inspection.

Description

Technical Field

[0001] The invention relates to the field of valve casting, and in particular to a precision casting process for stainless steel valve castings. Background Art

[0002] The precision casting process of castings includes the investment casting process, which uses wax mold casting to cast the castings, but there are still some problems in the separation process of the mold shell and the casting in the existing investment casting process;

[0003] For example, in the existing market, manual and simple vibration machines are used for shelling. For shells with complex structures, both of the above two methods will have a lot of residual sand, resulting in a lot of energy required for subsequent processing steps. At the same time, the sand cannot be discharged during the shelling process and can only be discharged after the machine is shut down. Too much sand during the shelling process may hinder the shelling action. Summary of the invention

[0004] The purpose of the present invention is to provide a stainless steel valve casting precision casting process to solve the above technical problems.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A stainless steel valve casting precision casting process, comprising the following steps:

[0007] S1. Molding: Press the wax material into the mold cavity and take it out after cooling to form a wax mold;

[0008] S2. Mold repair: repair the seams, wax injection nozzles and flow lines on the surface of the wax mold;

[0009] S3, making a mold shell: coating the wax mold surface with refractory coating for many times and sprinkling refractory sand, then drying and hardening, repeating this process 5-6 times to form a silica sol mold shell;

[0010] S4, dewaxing: steam is used to melt the wax in the shell and discharge it, leaving a hollow shell;

[0011] S5, shell calcination: the dewaxed shell is calcined at 950-1050 degrees for 1-2 hours to burn off the remaining wax and moisture;

[0012] S6, melting and pouring: After the materials are divided according to the product material composition, the molten steel is melted, the slag is removed and the spectrum test is carried out. After passing the test, it is poured in the red shell state to form a casting blank;

[0013] S7, sand cleaning and shelling: After the casting blank is cooled, a vibrating shelling machine is used to separate the mold shell from the casting blank, and preliminary sand cleaning and shot blasting are performed;

[0014] S8, finishing inspection: welding, grinding, correction and shot blasting are carried out on the casting blank to repair the sand holes, slag holes and flash burrs on the casting blank;

[0015] S9, Quality Inspection: Check the size and appearance of the finished castings, and put them into storage after they are qualified;

[0016] The process of separating the mold shell from the casting blank in the above-mentioned precision casting process step S7 needs to be completed by a vibrating shelling machine to complete the corresponding processing operations. The vibrating shelling machine includes a base, a controller and a box body are arranged on the base, a vibration mechanism is arranged in the box body, an upper movable plate is arranged above the vibration mechanism, the upper movable plate is slidably installed on the upper part of the box body, a lower movable plate is arranged below the vibration mechanism, a telescopic cylinder is arranged between the lower movable plate and the bottom of the box body, and the telescopic cylinder can drive the lower movable plate to move up and down. Through the up and down movement of the above-mentioned lower movable plate, the shelling space composed of the upper movable plate and the lower movable plate and the channel of the outside world are intermittently opened to realize the discharge of broken sand.

[0017] Furthermore, the vibration mechanism includes a driving motor, which is installed on the outer wall of the box body, and the driving motor is connected to the rotating shaft in a transmission manner. The rotating shaft is rotatably installed on two opposite inner walls of the box body, and a plurality of vibration disks are spaced apart on the rotating shaft. The vibration disks are eccentrically arranged on the rotating shaft, and grooves are provided at both ends of the long axis direction of the vibration disks, and a spring rod is fixedly arranged in the groove, and a crushing head is fixed at the end of the spring rod, and the crushing head is arranged in a conical structure, and the head end diameter of the crushing head is smaller than the tail end diameter of the crushing head.

[0018] Furthermore, a transverse through groove is provided below the lower movable plate, and a sand falling plate is slidably installed in the transverse through groove, and corresponding sand falling holes are provided on the sand falling plate and the lower movable plate, and an L-shaped push plate is fixedly provided on a section of the sand falling plate, and one end of the L-shaped push plate is connected to the outer wall of the box body with a return spring, and the other end is movably inserted into the box body and fixed with a No. 1 inclined block, and the No. 1 inclined block is located on the moving path of the telescopic end of the telescopic cylinder, and a No. 2 inclined block is fixed to the telescopic end of the telescopic cylinder, and the No. 1 inclined block cooperates with the No. 2 inclined block, and when the No. 2 inclined block moves downward, the No. 1 inclined block is pushed to slide outward, driving the L-shaped plate and the sand falling plate to move to one side and just aligning the sand falling holes on the sand falling plate and the lower movable plate.

[0019] Furthermore, a transverse impact assembly is arranged on the upper movable plate, and the transverse impact assembly is used for assisting in crushing the mold shell in the shelling space.

[0020] Furthermore, the lateral impact assembly includes a waist-shaped track arranged around the side wall of the shelling space, and a plurality of movable seats are slidably connected to the waist-shaped track. Two adjacent movable seats are movably connected by a connecting plate, and an impact head is connected to the movable seat. A column is fixed to the top of one of the movable seats, and a permanent magnet is fixedly connected to the end of the column. The permanent magnet is magnetically attracted to the electromagnet, and the electromagnet is slidably installed in a waist-shaped groove. The waist-shaped groove is opened on the top of the upper movable plate, and a positioning block is fixed to one side of the electromagnet. The positioning block is toggled by the toggle assembly to achieve sliding around the waist-shaped groove.

[0021] Furthermore, the toggle assembly includes an extension rod, an end of the extension rod is transmission-connected to the output end of the servo motor, the servo motor is mounted on the upper movable plate, an movable slot is provided at the end of the extension rod, a retracting rod is slidably inserted in the movable slot, the bottom of the retracting rod is provided as a T-shaped structure, the T-shaped structure is adapted to the movable slot, a support spring is provided between the bottom of the movable slot and the bottom of the retracting rod, and the end of the retracting rod is in contact with the positioning block.

[0022] Furthermore, a gear is provided at the bottom of the impact head, the gear is rotatably connected to the movable seat, a tooth portion is provided on the inner side wall of the waist-shaped slide rail, and the gear is meshed with the tooth portion.

[0023] Furthermore, a movable groove is provided at the connection between the gear and the bottom of the impact head, a sliding portion is provided at the bottom of the impact head, the sliding portion is limitedly slidably connected to the movable groove, a bracket is provided at the bottom of the impact head, arc-shaped protrusions are arranged at intervals on the waist-shaped track, and the arc-shaped protrusions are located on the moving path of the bracket.

[0024] Beneficial effects of the present invention:

[0025] (1) The shell placed in the shelling space is vibrated and crushed by a vibration mechanism, and finally separated from the casting blank. The rotating shaft is driven by a driving motor to rotate, and the rotating shaft drives the vibration plate to rotate. Since the vibration plate is eccentrically arranged, the two ends of the vibration plate in the long axis direction will alternately contact the upper movable plate and the lower movable plate, so that the shelling space is periodically enlarged and reduced. Under the action of gravity, the shell always falls on the lower movable plate. Therefore, in the process of the lower movable plate moving up and down, the shell in the shelling space will form a repeated vibration effect, so as to accelerate the separation speed of the shell and the casting blank;

[0026] (2) A sand falling plate is provided to process the crushed fallen sand, and the vibrating plate is used to push the lower movable plate to overcome the force of the elastic support of the telescopic cylinder to forcibly move downward, so that the telescopic end of the telescopic cylinder drives the second inclined block to move downward. During the downward movement of the second inclined block, it contacts the first inclined block and pushes the first inclined block to move outward, so that the L-shaped push plate is passively moved outward. After the lower movable plate moves down to the right position, the stopped L-shaped push plate drives the sand falling plate to align with the sand falling hole on the lower movable plate, so that the staggered and closed shelling space in the initial state is connected with the bottom of the box body, and then the fallen sand is automatically separated and processed. Compared with the means of stopping the machine to process the fallen sand in the prior art, the present invention is obviously more convenient, and there is no need to use additional power to realize the action of sand discharge. It only needs to use the force of the vibrating plate to push the lower movable plate and the contraction of the telescopic cylinder to realize the rapid switching of the shelling space to the outside world. It can not only realize the discharge of the fallen sand, but also does not occupy the original vibration shelling time, achieving multiple goals at one stroke;

[0027] (3) A structure for meshing gear teeth and a structure for an arc-shaped protrusion to push the impact head to extend intermittently toward the mold shell are provided. Under the meshing action of the gear and the tooth, the gear is always in a rotating state. Therefore, the impact head connected to the impact head not only has the effect of vibration impact, but also can have rotation impact. Compared with a single impact method, the dual effect of vibration impact plus rotation impact can enhance the destructiveness to the mold shell, so as to achieve the purpose of accelerating the crushing of the mold shell and the separation of the casting blank. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be further described below in conjunction with the accompanying drawings.

[0029] Figure 1 It is a process step diagram of the present invention;

[0030] Figure 2 It is a schematic diagram of the structure inside the box body of the present invention;

[0031] Figure 3 for Figure 2 Schematic diagram of some structures;

[0032] Figure 4 This is a schematic diagram of the positions of the vibrating plate and the crushing head;

[0033] Figure 5 is a top view schematic diagram of the upper movable plate;

[0034] Figure 6 It is a schematic diagram of the structure of the waist-shaped track;

[0035] Figure 7 A three-dimensional schematic diagram of the bracket and the arc-shaped protrusion.

[0036] Description of the drawings: 1. Box; 2. Vibration mechanism; 3. Upper movable plate; 4. Lower movable plate; 5. Telescopic cylinder; 21. Driving motor; 22. Rotating shaft; 23. Vibrating plate; 24. Groove; 25. Spring rod; 26. Crushing head; 6. Horizontal through groove; 7. Sand falling plate; 8. Sand falling hole; 9. L-shaped push plate; 10. No. 1 inclined block; 11. No. 2 inclined block; 12. Horizontal impact assembly; 121. Waist-shaped track; 122. Movable seat; 123, impact head; 124, column; 125, permanent magnet; 126, electromagnet; 127, waist-shaped groove; 128, positioning block; 13, toggle assembly; 131, extension rod; 132, servo motor; 133, movable slot; 134, retracting rod; 135, supporting spring; 136, gear; 137, tooth portion; 128, movable groove; 139, sliding portion; 140, bracket; 141, arc-shaped protrusion. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] See also Figure 1-Figure 7 As shown, the present invention is a stainless steel valve casting precision casting process, comprising the following steps:

[0039] S1. Molding: Press the wax material into the mold cavity and take it out after cooling to form a wax mold;

[0040] S2. Mold repair: repair the seams, wax injection nozzles and flow lines on the surface of the wax mold;

[0041] S3, making a mold shell: coating the wax mold surface with refractory coating for many times and sprinkling refractory sand, then drying and hardening, repeating this process 5-6 times to form a silica sol mold shell;

[0042] S4, dewaxing: steam is used to melt the wax in the shell and discharge it, leaving a hollow shell;

[0043] S5, shell calcination: the dewaxed shell is calcined at 950-1050 degrees for 1-2 hours to burn off the remaining wax and moisture;

[0044] S6, melting and pouring: After the materials are divided according to the product material composition, the molten steel is melted, the slag is removed and the spectrum test is carried out. After passing the test, it is poured in the red shell state to form a casting blank;

[0045] S7, sand cleaning and shelling: After the casting blank is cooled, a vibrating shelling machine is used to separate the mold shell from the casting blank, and preliminary sand cleaning and shot blasting are performed;

[0046] S8, finishing inspection: welding, grinding, correction and shot blasting are carried out on the casting blank to repair the sand holes, slag holes and flash burrs on the casting blank;

[0047] S9, Quality Inspection: Check the size and appearance of the finished castings, and put them into storage after they are qualified;

[0048] The process of separating the mold shell from the casting blank in the above-mentioned precision casting process step S7 needs to be completed by a vibration shelling machine to complete the corresponding processing operations. The vibration shelling machine includes a base, on which a controller and a box body 1 are arranged, and a vibration mechanism 2 is arranged in the box body 1. An upper movable plate 3 is arranged above the vibration mechanism 2, and the upper movable plate 3 is slidably installed on the upper part of the box body 1. A lower movable plate 4 is arranged below the vibration mechanism 2, and a telescopic cylinder 5 is arranged between the lower movable plate 4 and the bottom of the box body 1. The telescopic cylinder 5 can drive the lower movable plate 4 to move up and down. Through the up and down movement of the above-mentioned lower movable plate 4, the shelling space composed of the upper movable plate 3 and the lower movable plate 4 and the channel to the outside world are intermittently opened to discharge the broken sand.

[0049] Furthermore, the vibration mechanism 2 includes a drive motor 21, which is installed on the outer wall of the box body 1. The drive motor 21 is transmission-connected to a rotating shaft 22. The rotating shaft 22 is rotatably installed on two opposite inner walls of the box body 1. A plurality of vibration disks 23 are spaced apart on the rotating shaft 22. The vibration disks 23 are eccentrically arranged on the rotating shaft 22. Grooves 24 are provided at both ends of the long axis direction of the vibration disk 23. A spring rod 25 is fixedly arranged in the groove 24. A crushing head 26 is fixed at the end of the spring rod 25. The crushing head 26 is arranged in a conical structure, and the head end diameter of the crushing head 26 is smaller than the tail end diameter of the crushing head 26. When in use, the shell placed in the shelling space is vibrated and crushed by the vibration mechanism 2, and finally separated from the casting blank. The rotating shaft 22 is driven to rotate by the driving motor 21, and the rotating shaft 22 drives the vibration plate 23 to rotate. Since the vibration plate 23 is eccentrically arranged, the two ends of the long axis direction of the vibration plate 23 will alternately contact with the upper movable plate 3 and the lower movable plate 4, so that the shelling space is periodically enlarged and reduced. Under the action of gravity, the shell always falls on the lower movable plate 4. Therefore, in the process of the lower movable plate 4 moving up and down, the shell in the shelling space will form a repeated vibration effect, so as to accelerate the separation speed of the shell and the casting blank; at the same time, in order to accelerate the separation of the shell, a crushing head 26 is arranged at the end of the vibration plate 23, and the shell is destroyed by the crushing head 26 during the circumferential rotation of the vibration plate 23, thereby destroying the integrity of the shell and achieving the effect of breaking the surface with a point. Combined with the repeated vibration effect, it is easier to form an enlarged fragmentation at the damage of the crushing head 26, and further improve the efficiency of the shell crushing and separation.

[0050] Furthermore, a transverse through groove 6 is provided below the lower movable plate 4, and a sand falling plate 7 is slidably installed in the transverse through groove 6. Corresponding sand falling holes 8 are provided on the sand falling plate 7 and the lower movable plate 4, and an L-shaped push plate 9 is fixedly provided on a section of the sand falling plate 7. One end of the L-shaped push plate 9 is connected to the outer wall of the box body 1 with a return spring, and the other end is movably inserted into the box body 1 and fixed with a No. 1 inclined block 10, which is located on the moving path of the telescopic end of the telescopic cylinder 5. A No. 2 inclined block 11 is fixed to the telescopic end of the telescopic cylinder 5, and the No. 1 inclined block 10 cooperates with the No. 2 inclined block 11. When the No. 2 inclined block 11 moves downward, the No. 1 inclined block 10 is pushed to slide outward, driving the L-shaped plate and the sand falling plate 7 to move to one side and just aligning the sand falling holes 8 on the sand falling plate 7 and the lower movable plate 4. When in use, the sand falling plate 7 is provided to process the crushed sand, and the vibrating plate 23 is used to push the downward movement to overcome the force of the elastic support of the telescopic cylinder 5 to force the downward movement, so that the telescopic end of the telescopic cylinder 5 drives the second inclined block 11 to move downward. During the downward movement of the second inclined block 11, it contacts the first inclined block 10 and pushes the first inclined block 10 to move outward, so that the L-shaped push plate 9 is passively moved outward. After the lower movable plate 4 moves down to the right position, the stopped L-shaped push plate 9 drives the sand falling plate 7 and the sand falling hole 8 on the lower movable plate 4. By aligning, the staggered and closed shelling space in the initial state is connected with the bottom of the box body 1, and the fallen sand is automatically separated and processed. Compared with the means of stopping the machine to process the fallen sand in the prior art, the present invention is obviously more convenient, and there is no need to use additional power to realize the action of discharging the fallen sand. It only needs to use the force of the vibration plate 23 to push the lower movable plate 4 and the telescopic cylinder 5 to contract, so as to realize the rapid switching of the shelling space connected with the outside world. It can realize the discharge of the fallen sand without occupying the original vibration shelling time, achieving multiple goals at one stroke.

[0051] Furthermore, a transverse impact assembly 12 is provided on the upper movable plate 3, and the transverse impact assembly 12 is used for assisting in crushing the mold shell in the shelling space.

[0052] Furthermore, the lateral impact assembly 12 includes a waist-shaped track 121 arranged around the side wall of the shelling space, and a plurality of movable seats 122 are slidably connected to the waist-shaped track 121. Two adjacent movable seats 122 are movably connected via a connecting plate, and an impact head 123 is connected to the movable seat 122. A column 124 is fixed to the top of one of the movable seats 122, and a permanent magnet 125 is fixedly connected to the end of the column 124. The permanent magnet 125 is magnetically attracted to the electromagnet 126, and the electromagnet 126 is slidably installed in a waist-shaped groove 127. The waist-shaped groove 127 is opened on the top of the upper movable plate 3, and a positioning block 128 is fixed on one side of the electromagnet 126. The positioning block 128 is toggled by the toggle assembly 13 to achieve sliding around the waist-shaped groove 127.

[0053] Furthermore, the toggle assembly 13 includes an extension rod 131, the end of the extension rod 131 is transmission-connected to the output end of a servo motor 132, the servo motor 132 is mounted on the upper movable plate 3, the end of the extension rod 131 is provided with a movable slot 133, a retractable rod 134 is slidably inserted in the movable slot 133, the bottom of the retractable rod 134 is provided with a T-shaped structure, the T-shaped structure is adapted to the movable slot 133, a support spring 135 is provided between the bottom of the movable slot 133 and the bottom of the retractable rod 134, and the end of the retractable rod 134 is in contact with the positioning block 128. When in use, the supporting force provided by the supporting spring 135 makes the retracted rod 134 always lifted up so that it can adapt to the positioning block 128 whose spacing changes when moving, and always keep the two in contact. The positioning block 128 is moved along the waist-shaped groove 127 by connecting the extension rod 131 and the retracted rod 134 to form a whole. Under the magnetic attraction of the electromagnet and the permanent magnet 125 under the upper movable plate 3, the electromagnet 126 and the permanent magnet 125 maintain relatively synchronous movement, thereby driving the movable seats 122 connected in pairs, and finally allowing multiple impact heads 123 to slide along the waist-shaped track 121, thereby realizing intermittent impact on the mold shell in the horizontal direction, and further improving the mold shell separation efficiency; it should be noted that the impact head 123 is an impact device driven by a vibration motor, and each impact head 123 works independently, which will not be repeated here.

[0054] Furthermore, a gear 136 is provided at the bottom of the impact head 123 , and the gear 136 is rotatably connected to the movable seat 122 . A tooth portion 137 is provided on the inner side wall of the waist-shaped slide rail, and the gear 136 meshes with the tooth portion 137 .

[0055] Furthermore, a movable groove 138 is provided at the connection between the gear 136 and the bottom of the impact head 123, a sliding portion 139 is provided at the bottom of the impact head 123, the sliding portion 139 is connected to the movable groove 138 in a limited sliding manner, a bracket 140 is provided at the bottom of the impact head 123, and arc-shaped protrusions 141 are arranged at intervals on the waist-shaped track 121, and the arc-shaped protrusions 141 are located on the moving path of the bracket 140. When in use, in order to further enhance the crushing of the mold shell, a structure in which the gear 136 teeth 137 meshes and an arc-shaped protrusion 141 pushes the impact head 123 to intermittently extend toward the mold shell are provided. Under the meshing action of the gear 136 and the teeth 137, the gear 136 is always in a rotating state, so that the impact head 123 connected thereto is driven, so that the impact head 123 not only has the effect of vibration impact, but also can have rotation impact. Compared with a single impact method, the dual effect of vibration impact plus rotation impact can further enhance the destructiveness to the mold shell, so as to accelerate the crushing of the mold shell and the casting. The purpose of the blank separation; the setting of the arc-shaped protrusion 141 can intermittently contact the bracket 140, thereby forming a pushing action on the bracket 140, and the bracket 140 drives the impact head 123 to produce a certain distance outward relative to the movable seat 122, and then waits for it to reset under the action of the spring provided in the movable groove 138, and the impact head 123 is improved by performing a surrounding auxiliary impact shelling along the waist-shaped track 121. During the movement, the periodic expansion and contraction of the impact head 123 combined with the rotation effect of the impact head 123 can obviously further expand the damaged part of the shell and achieve the purpose of acceleration.

[0056] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A stainless steel valve casting precision casting process, characterized in that: The steps include: S1. Molding: Press the wax material into the mold cavity and take it out after cooling to form a wax mold; S2. Mold repair: repair the seams, wax injection nozzles and flow lines on the surface of the wax mold; S3, making a mold shell: coating the wax mold surface with refractory coating for many times and sprinkling refractory sand, then drying and hardening, repeating this process 5-6 times to form a silica sol mold shell; S4, dewaxing: steam is used to melt the wax in the shell and discharge it, leaving a hollow shell; S5, shell calcination: the dewaxed shell is calcined at 950-1050 degrees for 1-2 hours to burn off the remaining wax and moisture; S6, melting and pouring: After the materials are divided according to the product material composition, the molten steel is melted, the slag is removed and the spectrum test is carried out. After passing the test, it is poured in the red shell state to form a casting blank; S7, sand cleaning and shelling: After the casting blank is cooled, a vibrating shelling machine is used to separate the mold shell from the casting blank, and preliminary sand cleaning and shot blasting are performed; S8, finishing inspection: welding, grinding, correction and shot blasting are carried out on the casting blank to repair the sand holes, slag holes and flash burrs on the casting blank; S9, Quality Inspection: Check the size and appearance of the finished castings, and put them into storage after they are qualified; The process of separating the mold shell from the casting blank in the above-mentioned precision casting process step S7 needs to be completed by a vibration shelling machine to complete the corresponding processing operation. The vibration shelling machine comprises a base, on which a controller and a box (1) are arranged, and a vibration mechanism (2) is arranged in the box (1). An upper movable plate (3) is arranged above the vibration mechanism (2), and the upper movable plate (3) is slidably installed on the upper part of the box (1). A lower movable plate (4) is arranged below the vibration mechanism (2), and a telescopic cylinder (5) is arranged between the lower movable plate (4) and the bottom of the box (1). The telescopic cylinder (5) can drive the lower movable plate (4) to move up and down. Through the up and down movement of the above-mentioned lower movable plate (4), the shelling space formed by the upper movable plate (3) and the lower movable plate (4) and the outside passage are intermittently opened to discharge the crushed sand; a lateral impact component (12) is arranged on the upper movable plate (3), and the lateral impact component (12) is used to The shell in the space is auxiliary crushed; the lateral impact component (12) comprises a waist-shaped track (121) arranged around the side wall of the shelling space, a plurality of movable seats (122) are slidably connected to the waist-shaped track (121), two adjacent movable seats (122) are movably connected via a connecting plate, an impact head (123) is connected to the movable seat (122), a column (124) is fixed to the top of one of the movable seats (122), a permanent magnet (125) is fixed to the end of the column (124), the permanent magnet (125) and the electromagnet (126) are magnetically attracted to each other, the electromagnet (126) is slidably installed in a waist-shaped groove (127), the waist-shaped groove (127) is opened on the top of the upper movable plate (3), a positioning block (128) is fixed to one side of the electromagnet (126), and the positioning block (128) is toggled by the toggle component (13) to achieve sliding around the waist-shaped groove (127).

2. The stainless steel valve casting precision casting process according to claim 1, characterized in that: The vibration mechanism (2) comprises a drive motor (21), the drive motor (21) being mounted on the outer side wall of the housing (1), the drive motor (21) being in driving connection with a rotating shaft (22), the rotating shaft (22) being rotatably mounted on two opposite inner side walls of the housing (1), a plurality of vibration disks (23) being spaced apart on the rotating shaft (22), the vibration disks (23) being eccentrically mounted on the rotating shaft (22), grooves (24) being provided at both ends of the long axis direction of the vibration disk (23), a spring rod (25) being fixedly mounted in the groove (24), a crushing head (26) being fixedly mounted at the end of the spring rod (25), the crushing head (26) being arranged in a conical structure, and the diameter of the head end of the crushing head (26) being smaller than the diameter of the tail end of the crushing head (26).

3. The stainless steel valve casting precision casting process according to claim 2, characterized in that: A transverse through groove (6) is provided below the lower movable plate (4), a sand falling plate (7) is slidably mounted in the transverse through groove (6), the sand falling plate (7) and the lower movable plate (4) are provided with corresponding sand falling holes (8), an L-shaped push plate (9) is fixedly provided on a section of the sand falling plate (7), one end of the L-shaped push plate (9) is connected to the outer wall of the box body (1) by a return spring, and the other end is movably inserted into the box body (1) and fixed with a No. 1 inclined block (1 0), the first inclined block (10) is located on the moving path of the telescopic end of the telescopic cylinder (5), and the telescopic end of the telescopic cylinder (5) is fixed with a second inclined block (11). The first inclined block (10) cooperates with the second inclined block (11). When the second inclined block (11) moves downward, it pushes the first inclined block (10) to slide outward, driving the L-shaped plate and the sand falling plate (7) to move to one side and just aligning the sand falling plate (7) and the sand falling hole (8) on the lower movable plate (4).

4. The stainless steel valve casting precision casting process according to claim 3, characterized in that: The toggle assembly (13) comprises an extension rod (131), the end of the extension rod (131) being transmission-connected to the output end of a servo motor (132), the servo motor (132) being mounted on the upper movable plate (3), the end of the extension rod (131) being provided with a movable slot (133), a retractable rod (134) being slidably inserted in the movable slot (133), the bottom of the retractable rod (134) being provided with a T-shaped structure, the T-shaped structure being adapted to the movable slot (133), a support spring (135) being provided between the bottom of the movable slot (133) and the bottom of the retractable rod (134), and the end of the retractable rod (134) being in contact with the positioning block (128).

5. The stainless steel valve casting precision casting process according to claim 4, characterized in that: A gear (136) is provided at the bottom of the impact head (123), and the gear (136) is rotatably connected to the movable seat (122). A tooth portion (137) is provided on the inner side wall of the waist-shaped track, and the gear (136) meshes with the tooth portion (137).

6. The stainless steel valve casting precision casting process according to claim 5, characterized in that: A movable groove (138) is provided at the connection between the gear (136) and the bottom of the impact head (123); a sliding portion (139) is provided at the bottom of the impact head (123); the sliding portion (139) is connected to the movable groove (138) in a limited sliding manner; a bracket (140) is provided at the bottom of the impact head (123); arc-shaped protrusions (141) are provided at intervals on the waist-shaped track (121), and the arc-shaped protrusions (141) are located on the moving path of the bracket (140).

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