A rapid release of an expendable pattern casting

Abstract

The utility model relates to the field of lost foam casting, disclose a kind of can quickly separate lost foam casting, including bottom box, the outer wall left end of bottom box is fixedly connected with motor, the drive end of motor is penetrated the inner wall of bottom box and is fixedly connected with rotating column, the outer wall of rotating column is fixedly connected with outer disc, the outer wall of outer disc is fixedly connected with bottom bar, the outer wall of bottom bar is provided with vibration subassembly, and bottom bar is connected with top plate by vibration subassembly, the inner wall top end of bottom box is fixedly connected with sand box, the front end left and right sides of sand box are fixedly connected with hinge, the top end of hinge is rotatably connected with sand box, and the top end of sand box is used to close sand box. In the utility model, high-frequency vibration is applied to the box by vibration subassembly, the flowability and compactness of the sand are improved, the generation of filling dead angle and loose area is reduced, thereby effectively avoiding the casting surface defects caused by insufficient sand support.

Description

Technical Field

[0001] This utility model relates to the field of lost foam casting, and in particular to a method for quickly detaching lost foam castings. Background Technology

[0002] Lost foam casting is a process in which a foam plastic model is made, buried in sand, and molten metal is poured directly into it. When the foam model is heated, it vaporizes and disappears, and the molten metal occupies its position. After cooling, the resulting metal part is formed. This process is widely used in the production of complex structural parts due to its advantages such as high dimensional accuracy, small machining allowance, and clean production.

[0003] Currently, most lost foam casting production lines use top free-fall sand feeding. However, the sand relies solely on gravity to fall, which easily leads to sand bridging above the model. This means that sand particles bridge each other at the model opening or above narrow channels, preventing subsequent sand particles from entering the internal space. This results in numerous dead zones and loose areas inside or below the model. During the pouring process, the high-temperature molten metal rapidly vaporizes the foam pattern. For these dead zones and loose areas, the insufficient compactness of the molding sand cannot provide enough support and resistance. When the molten metal fills these areas, the loose molding sand will shift and collapse under the static pressure and thermal shock of the molten metal. This leads to surface defects in the casting, such as sand swelling, sand adhesion, excess material, and unclear contours, severely reducing the yield and mechanical properties of the casting. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a method that can quickly detach lost foam castings. This method applies high-frequency vibration to the box body through a vibration component, improving the fluidity and compactness of the molding sand, reducing the generation of dead corners and loose areas, thereby effectively avoiding surface defects in castings caused by insufficient molding sand support, and improving the overall quality and yield of castings.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a device capable of quickly detaching a lost foam casting, comprising a base box, a motor fixedly connected to the left end of the outer wall of the base box, a drive end of the motor penetrating the inner wall of the base box and fixedly connected to a rotating column, an outer plate fixedly connected to the outer wall of the rotating column, a bottom rod fixedly connected to the outer wall of the outer plate, a vibration assembly provided on the outer wall of the bottom rod, the bottom rod being connected to a top plate through the vibration assembly, a lower sand box fixedly connected to the top of the inner wall of the base box, hinges fixedly connected to the left and right sides of the front end of the lower sand box, and an upper sand box rotatably connected to the top of the hinges, the upper sand box being used to close the top of the lower sand box.

[0006] Furthermore, the vibration assembly includes a rotating plate rotatably connected to the outer wall of the base rod, a fixed column rotatably connected to the top of the outer wall of the rotating plate, a top pipe rotatably connected to the outer wall of the fixed column, and the outer wall of the top pipe slidably connected to the inner wall of the base box.

[0007] Furthermore, pressure tubes are slidably connected to the four corners of the top of the bottom box, and a top plate is fixedly connected to the top of the pressure tubes. Compression springs are fixedly connected to the front and rear sides of the bottom of the top plate. A round tube is fixedly connected to the outer wall of the compression spring, and the bottom end of the round tube is fixedly connected to the top of the outer wall of the bottom box. The top tube is used to impact the pressure tubes.

[0008] Furthermore, connecting plates are fixedly connected to both the left and right sides of the lower sand box, and the top plate is used to collide with the connecting plates.

[0009] Furthermore, an inner plate is fixedly connected to the front end of the bottom rod, and an inner rod is fixedly connected to the inner wall of the inner plate. The inner rods are rotatably connected to both the front and rear sides of the inner wall of the bottom box, and the two inner rods are connected by a synchronous belt.

[0010] Furthermore, the lower sand box is fixedly connected to the left and right sides of its rear end with clips, the upper sand box is attached to the top of the clips, the upper sand box is fixedly connected to the top of its inner wall with a feed inlet, and the top of the feed inlet is provided with a cap.

[0011] Furthermore, a hydraulic rod is fixedly connected to the bottom of the inner wall of the bottom box, a push plate is fixedly connected to the drive end of the hydraulic rod, a plastic box is fixedly connected to the top of the push plate, and the outer walls of the plastic box and the push plate are slidably connected to the inner wall of the lower sand box.

[0012] Furthermore, a vacuum pump is fixedly connected to the left end of the bottom box, and the vacuum pump is used to evacuate the interior of the lower sand box.

[0013] This utility model has the following beneficial effects:

[0014] 1. In this utility model, the high-frequency vibration of the box is applied by the vibration component to improve the fluidity and compactness of the molding sand, reduce the generation of dead corners and loose areas, thereby effectively avoiding surface defects of the casting caused by insufficient support of the molding sand, and improving the overall quality and yield of the casting.

[0015] 2. In this utility model, after the casting has cooled, the vacuum pump is turned off, and the sand box is vibrated again to further separate the molding sand from the surface of the casting. Then, the sand box is opened and the push plate is pushed by the hydraulic rod, so that the push plate pushes the plastic box and drives the molded casting to quickly detach from the device. This greatly shortens the time for the casting to detach from the device, reduces the intensity of manual labor, and avoids the impact damage to the surface of the casting that may be caused by manual operation, thus further ensuring the integrity of the casting. Attached Figure Description

[0016] Figure 1 A perspective view of a lost foam casting that can be quickly detached from the present invention;

[0017] Figure 2 This utility model presents a plastic box capable of quickly separating from a lost foam casting.

[0018] Figure 3 A cross-sectional view of a bottom box that can quickly detach from a lost foam casting, as proposed in this utility model;

[0019] Figure 4 This invention presents a push plate capable of quickly detaching from a lost foam casting.

[0020] Legend:

[0021] 1. Base box; 2. Motor; 3. Vacuum pump; 4. Round tube; 5. Compression spring; 6. Top plate; 7. Connecting plate; 8. Pressure pipe; 9. Lower sand box; 10. Hinge; 11. Feed inlet; 12. Cover; 13. Upper sand box; 14. Clip; 15. Plastic box; 16. Top tube; 17. Fixed column; 18. Rotating plate; 19. Base rod; 20. Outer plate; 21. Rotating column; 22. Inner plate; 23. Inner rod; 24. Push plate; 25. Hydraulic rod. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Reference Figure 1 - Figure 4This utility model provides an embodiment of a device capable of quickly detaching a lost foam casting, comprising a base box 1. A motor 2 is fixedly connected to the left end of the outer wall of the base box 1. The drive end of the motor 2 penetrates the inner wall of the base box 1 and is fixedly connected to a rotating column 21. An outer plate 20 is fixedly connected to the outer wall of the rotating column 21. A bottom rod 19 is fixedly connected to the outer wall of the outer plate 20. A vibration assembly is provided on the outer wall of the bottom rod 19. An inner plate 22 is fixedly connected to the front end of the bottom rod 19. An inner rod 23 is fixedly connected to the inner wall of the inner plate 22. The inner wall of the base box 1 is rotated on both the front and rear sides. The bottom rod 19 is connected to the top plate 6 via a vibration assembly. The vibration assembly includes a rotating plate 18 rotatably connected to the outer wall of the bottom rod 19. A fixed column 17 is rotatably connected to the top of the outer wall of the rotating plate 18. A top tube 16 is rotatably connected to the outer wall of the fixed column 17. The outer wall of the top tube 16 is slidably connected to the inner wall of the bottom box 1. Pressure tubes 8 are slidably connected to the four corners of the top of the bottom box 1. The top plate 6 is fixedly connected to the top of the pressure tubes 8. Compression springs are fixedly connected to the front and rear sides of the bottom of the top plate 6. 5. A round tube 4 is fixedly connected to the outer wall of the compression spring 5. The bottom end of the round tube 4 is fixedly connected to the top of the outer wall of the base box 1. The top tube 16 is used to impact the pressure tube 8. Connecting plates 7 are fixedly connected to both the left and right sides of the lower sand box 9. The top plate 6 is used to collide with the connecting plate 7. The bottom of the inner wall of the base box 1 is fixedly connected to the top of the lower sand box 9. Hinges 10 are fixedly connected to both the left and right sides of the front end of the lower sand box 9. The top of the hinge 10 is rotatably connected to the upper sand box 13. The upper sand box 13 is used to close the top of the lower sand box 9. The left and right sides of the rear end of the lower sand box 9 are fixedly connected to... There is a clip 14, and the top of the clip 14 is fitted with an upper sand box 13. The top of the inner wall of the upper sand box 13 is fixedly connected to a feed inlet 11. The top of the feed inlet 11 is provided with a cover 12. The bottom of the inner wall of the bottom box 1 is fixedly connected to a hydraulic rod 25. The drive end of the hydraulic rod 25 is fixedly connected to a push plate 24. The top of the push plate 24 is fixedly connected to a plastic box 15. The outer walls of the plastic box 15 and the push plate 24 are slidably connected to the inner wall of the lower sand box 9. The left end of the bottom box 1 is fixedly connected to a vacuum pump 3, which is used to evacuate the air from the inside of the lower sand box 9.

[0024] Specifically, the operator first precisely places the pre-made foam model casting, coated with refractory paint, into the plastic box 15. Then, the motor 2 is started, driving the rotating column 21 to rotate. The rotating column 21 is connected to the outer plate 20, thereby driving the outer plate 20 to rotate synchronously. The outer plate 20 drives the bottom rod 19, and the rotation of the bottom rod 19 further drives the inner plate 22 and inner rod 23 connected to it to rotate. To ensure the synchronicity and stability of the movement on both sides of the bottom box 1, the inner rods 23 are connected by a synchronous belt, ensuring that the inner rods 23 on both sides operate synchronously, smoothly, and without differential speed in the bottom box 1. Driven by the motor 2, the rotating plate 18 set on the outer wall of the bottom rod 19 begins to periodically swing back and forth. This swing is transmitted to the jacking pipe 16 through the fixed column 17. This allows the jacking pipe 16 to slide back and forth within the guide rails on the inner wall of the base box 1. The upper end of the jacking pipe 16 is connected to the pressure pipe 8, so the pressure pipe 8 also moves up and down accordingly. A top plate 6 is installed on the pressure pipe 8, and the top plate 6 periodically collides with the connecting plates 7 on both sides of the lower sand box 9. This collision not only causes the lower sand box 9 to generate high-frequency controllable vibration, but also periodically squeezes and releases the compression spring 5 through the pressure pipe 8, thereby amplifying the vibration effect and subjecting the sand in the sand box to a continuous and uniform excitation force. At this time, the operator pours dry sand evenly into the lower sand box 9. Under the action of high-frequency vibration, the dry sand quickly flows and fills the area around and inside the plastic box 15. The sand particles interlock and are tightly arranged, quickly forming a sand mold with high compactness and uniform distribution. This process not only This significantly improves sand filling efficiency and avoids defects such as uneven sand mold density and voids that are common in traditional manual sand filling, laying a solid foundation for subsequent pouring processes. After the sand mold is compacted, motor 2 is turned off to stop vibration. Then, the operator flips the upper sand box 13 forward via hinge 10, precisely covering the top of the lower sand box 9, and secures it firmly with clips 14, forming a closed pouring environment. Next, vacuum pump 3 is started, and the interior of the lower sand box 9 is quickly evacuated to a certain vacuum level through the suction pipe. Under atmospheric pressure, the originally loose dry sand is compacted and solidified into a hard sand mold with sufficient mechanical strength. This vacuum solidification method not only improves the overall strength and stability of the sand mold but also effectively prevents leakage of molten metal during pouring. The scouring and breaking of the sand mold ensures the dimensional accuracy and surface quality of the casting. After the sand mold solidifies, the cap 12 is removed, and molten metal is slowly poured into the sand mold in the plastic box 15 through the feed port 11. During the pouring process, the foam model gradually vaporizes and disappears due to heating, and the molten metal fills its original space, gradually forming the casting. After pouring, the cap 12 is immediately replaced to maintain the vacuum environment inside the sand box. Throughout the cooling process, the vacuum pump 3 continues to work to ensure that the sand mold maintains sufficient strength and prevents cracking or deformation of the sand mold due to casting shrinkage or stress changes, thereby ensuring that the internal structure of the casting is dense and the shape is regular. After the casting has cooled sufficiently, the vacuum pump 3 is turned off, allowing the air pressure inside the sand box to return to normal pressure. At this point, the sand mold loses its vacuum solidification effect.The mold returns to a loose state, and then motor 2 is restarted to generate high-frequency vibration in the lower sand box 9 again. This vibration not only helps to further break the adhesion between the sand mold and the casting surface, but also allows residual molding sand to quickly fall off from the complex internal cavities, grooves, and surfaces of the casting, significantly reducing the difficulty of subsequent sand removal and avoiding damage to the casting surface caused by manual hammering. After vibration-assisted demolding, the operator presses the clamp 14 to release the restriction on the upper sand box 13, grasps the upper sand box 13, and flips it forward through the hinge 10 to fully open the interior of the lower sand box 9. At this time, the hydraulic rod 25 is activated, which pushes the push plate 24 upward. The push plate 24 makes close contact with the bottom of the plastic box 15. As the push plate 24 rises, the plastic box 15 and the casting and residual molding sand inside are smoothly pushed out of the lower sand box 9, achieving rapid, efficient, and damage-free separation.

[0025] Working principle: First, the foam model casting to be made is placed in the plastic box 15. Then, the motor 2 is started, which drives the rotating column 21 to rotate. The rotating column 21 drives the outer disk 20 to rotate, which in turn drives the bottom rod 19 to rotate. The bottom rod 19 drives the inner rod 23 to rotate via the connected inner disk 22. The inner rod 23 drives another inner rod 23 to rotate via a synchronous belt. This causes the inner rods 23 on both sides to rotate in the bottom box 1. At the same time, the rotation of the bottom rod 19 causes the rotating plate 18 on the outer wall of the bottom rod 19 to swing back and forth. The swinging of the rotating plate 18 drives the top pipe 16 to move on the inner wall of the bottom box 1 via the fixed column 17. The jacking pipe 16 slides up and down, causing the pressure pipe 8 to slide up and down. This causes the top plate 6 on the pressure pipe 8 to collide with the connecting plates 7 on both sides of the lower sand box 9. The movement of the pressure pipe 8 compresses the pressure spring 5, causing the sides of the lower sand box 9 to vibrate. Dry sand can then be poured into the lower sand box 9 until it is full and compacted. Then, the motor 2 is turned off, and the upper sand box 13 is covered on top of the lower sand box 9 by the hinge 10. The upper sand box 13 is then restricted by the clip 14, and the lower sand box 9 is then sealed. The vacuum pump 3 is then started to evacuate the interior of the lower sand box 9. Under atmospheric pressure, the loose dry sand is solidified into a hard sand mold.

[0026] Then, the cover 12 is removed from the feed port 11, and the molten metal is poured through the feed port 11 into the sand mold in the plastic box 15 on the lower sand box 9. After the pouring is completed, the feed port 11 is covered with the cover 12 again. During the process, the vacuum pump 3 continuously evacuates the inside of the lower sand box 9 to a vacuum until the casting is fully cooled. Then, the vacuum pump 3 is turned off to allow the internal air pressure of the lower sand box 9 to return to normal pressure, causing the sand mold to lose its strength and become loose. Then, the motor 2 is restarted to make the lower sand box 9 vibrate again, further separating the sand mold from the surface of the casting. Then, the clamp 14 is pressed to release the restriction on the upper sand box 13. Then, the upper sand box 13 is grasped and flipped forward through the hinge 10 to unfold the inside of the lower sand box 9. Then, the hydraulic rod 25 is activated to push the push plate 24 upward, causing the push plate 24 to move the plastic box 15 upward in the inner wall of the lower sand box 9 to separate the casting from the molding sand, and the fully exposed casting is quickly removed from the device.

[0027] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A rapid release expendable pattern casting capable of including a base box (1), characterized in that: A motor (2) is fixedly connected to the left end of the outer wall of the bottom box (1). The driving end of the motor (2) passes through the inner wall of the bottom box (1) and is fixedly connected to a rotating column (21). An outer plate (20) is fixedly connected to the outer wall of the rotating column (21). A bottom rod (19) is fixedly connected to the outer wall of the outer plate (20). A vibration component is provided on the outer wall of the bottom rod (19). The bottom rod (19) is connected to the top plate (6) through the vibration component. A lower sand box (9) is fixedly connected to the top of the inner wall of the bottom box (1). Hinges (10) are fixedly connected to the left and right sides of the front end of the lower sand box (9). An upper sand box (13) is rotatably connected to the top of the hinge (10). The upper sand box (13) is used to close the top of the lower sand box (9).

2. A rapid-release lost foam casting according to claim 1, wherein: The vibration assembly includes a rotating plate (18) rotatably connected to the outer wall of the base rod (19), a fixed column (17) rotatably connected to the top of the outer wall of the rotating plate (18), a top pipe (16) rotatably connected to the outer wall of the fixed column (17), and the outer wall of the top pipe (16) slidably connected to the inner wall of the base box (1).

3. A rapid-release lost foam casting according to claim 2, wherein: The top four corners of the bottom box (1) are slidably connected with pressure tubes (8), the top of the pressure tubes (8) is fixedly connected with a top plate (6), the bottom of the top plate (6) is fixedly connected with compression springs (5) on both the front and rear sides, the outer wall of the compression springs (5) is fixedly connected with a round tube (4), the bottom end of the round tube (4) is fixedly connected to the top of the outer wall of the bottom box (1), and the top tube (16) is used to impact the pressure tubes (8).

4. A rapid-release lost foam casting according to claim 3, wherein: The lower sand box (9) is fixedly connected to the left and right sides with connecting plates (7), and the top plate (6) is used to collide with the connecting plates (7).

5. A rapid-release lost foam casting according to claim 1, wherein: The bottom rod (19) is fixedly connected to the front end of the inner plate (22), and the inner wall of the inner plate (22) is fixedly connected to the inner rod (23). The inner rod (23) is rotatably connected to both the front and rear sides of the inner wall of the bottom box (1). The two inner rods (23) are connected by a synchronous belt.

6. A rapid-release lost foam casting according to claim 1, wherein: The lower sand box (9) is fixedly connected to the left and right sides of the rear end with a clip (14). The upper sand box (13) is clipped at the top of the clip (14). The upper sand box (13) is fixedly connected to the top of the inner wall of the upper sand box (13). The top of the upper sand box (11) is provided with a cover (12).

7. A rapid-release lost foam casting according to claim 1, wherein: A hydraulic rod (25) is fixedly connected to the bottom of the inner wall of the bottom box (1). A push plate (24) is fixedly connected to the driving end of the hydraulic rod (25). A plastic box (15) is fixedly connected to the top of the push plate (24). The outer walls of the plastic box (15) and the push plate (24) are slidably connected to the inner wall of the lower sand box (9).

8. A rapid-release lost foam casting according to claim 1, wherein: A vacuum pump (3) is fixedly connected to the left end of the bottom box (1), and the vacuum pump (3) is used to evacuate the interior of the lower sand box (9).

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