Compaction device for lost foam casting
By designing an inclined vibratory compaction device driven by a hydraulic rod and combining it with a multi-dimensional vibration motor, the problems of unstable sand box fixation and unidirectional vibration in traditional vibratory compaction devices are solved, thus achieving uniform filling of molding sand and improving the quality of castings.
Patent Information
- Application Number
- CN202520637049.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-07
- Publication Date
- 2026-03-06
- Estimated Expiration
- 2035-04-07
AI Technical Summary
Traditional vibration compaction devices suffer from problems such as unstable sand box fixation, unidirectional vibration, and uneven sand particle distribution, resulting in inconsistent compaction within the mold cavity. In particular, insufficient filling in complex cavities can easily lead to casting defects such as mold collapse, slag inclusion, and porosity.
A vibration compaction device including a vibration table, a top fixing component, and a hydraulic rod was designed. The top fixing component is driven by the hydraulic rod to tilt the sand box. Combined with a multi-dimensional vibration motor and tilting vibration, the molding sand is ensured to fill the lost foam cavity uniformly under gravity and combined vibration.
It improves the uniformity and efficiency of molding sand compaction, reduces casting defects, enhances the quality and precision of castings, and ensures the surface smoothness and structural integrity of castings.
Smart Images
Figure CN223970815U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of casting equipment technology, specifically a vibration compaction device for lost foam casting. Background Technology
[0002] Lost foam casting (EPC or LFC) is a technique that uses foamed plastic to create a mold that perfectly replicates the structure and dimensions of the part. These molds are coated with a refractory binder and dried before being used for dry sand molding. During the molding process, vibration compaction ensures that the molding sand evenly fills the gaps in the mold. Molten metal is then poured into the mold. Due to the thermal effect, the foamed plastic pattern vaporizes and disappears, resulting in a metal part that perfectly matches the shape of the original foamed plastic pattern.
[0003] In lost foam casting, vibration equipment is typically used to ensure that the molding sand in the sand box fills the gaps in the mold evenly. However, traditional vibration devices have several problems, such as unstable sand box fixation, unidirectional vibration, and uneven sand particle distribution. These problems can lead to inconsistent sand particle compaction within the mold cavity, especially in complex cavities, resulting in insufficient filling, mold collapse, inclusions, and porosity, severely impacting the casting quality. Utility Model Content
[0004] In order to overcome some of the problems mentioned in the background above, this invention provides a vibratory compaction device for lost foam casting.
[0005] The technical solution adopted by this utility model is as follows: a vibration compaction device for lost foam casting, including a vibration table and a top fixing component, a sand box is provided between the vibration table and the top fixing component, and the top fixing component is driven by a hydraulic rod to fix the sand box from above;
[0006] The top fixing component includes a top plate and a groove. The groove is located at the bottom of the top plate and corresponds to the top of the sand box. The bottom surface of the top plate has an inclined angle, and the bottom surface of the groove is parallel to the bottom surface of the top plate. When the top fixing component is pressed down, it causes the sand box to tilt.
[0007] Furthermore, it also includes a frame, which is fixedly connected to the worktable, a hydraulic rod connecting the frame and the top fixing member, and a vibration table embedded in the worktable pit, with the top surface of the vibration table flush with the worktable.
[0008] Furthermore, the vibration table includes a support rod, a support platform, and a base. The support rod is disposed on the support platform. There are two support rods, which are arranged in parallel. The support rod is connected to the bottom of the sand box.
[0009] Vibration damping components are provided at the four corners between the support platform and the base. Vertical vibration motors are fixed to the sides of the support platform, and horizontal vibration motors are provided at the bottom of the support platform.
[0010] Furthermore, the top fixing component also includes a sand passage hole, which is located in the middle of the top plate. The hydraulic rods are symmetrically arranged on both sides of the sand passage hole. The sand passage hole is used to observe the height of the molding sand in the sand box and to continue filling the sand box with molding sand.
[0011] Furthermore, the bottom of the sand box is provided with a limiting groove, which is correspondingly provided with the support rod, and the limiting groove is used to limit the position of the sand box.
[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0013] Through the coordinated action of the top fixing component, sand box, and vibration table, the sand box is kept tilted and continuously vibrates during the tilting motion. This ensures that the molding sand particles, under the combined action of gravity and combined vibration, can achieve compaction of the tilted sand box, effectively filling the cavities of the lost foam casting, thereby improving the compaction uniformity and efficiency of the molding sand and further enhancing the quality of the castings. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of a vibration compaction device (installation position) for lost foam casting according to an embodiment of the present invention;
[0015] Figure 2 This is a schematic diagram of a vibration compaction device (vibration compaction position) for lost foam casting according to an embodiment of the present invention;
[0016] Figure 3 This is a schematic diagram of the front view (vibration position) of a vibration compaction device for lost foam casting according to an embodiment of the present invention;
[0017] Figure 4 for Figure 2 A bottom view of the medium sand box;
[0018] Figure 5 for Figure 2 Top view of the top fixing plate;
[0019] Figure 6 for Figure 4 Schematic diagram of the AA section along the middle edge;
[0020] Figure 7 for Figure 2 Schematic diagram of the vibration table.
[0021] In the picture:
[0022] 1. Vibration table; 11. Support rod; 12. Support platform; 13. Vibration damping component; 14. Vertical vibration motor; 15. Base; 16. Horizontal vibration motor; 2. Top fixing component; 21. Top plate; 22. Groove; 23. Sand passage hole; 3. Frame; 4. Hydraulic rod; 5. Sand box; 51. Limiting groove; 6. Worktable. Detailed Implementation
[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. 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 skilled in the art without creative effort are within the protection scope of the present utility model.
[0024] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0025] like Figures 1-7 As shown, in some embodiments, a vibration compaction device for lost foam casting includes a vibration table 1 and a top fixing member 2, with a sand box 5 positioned between the vibration table 1 and the top fixing member 2, enabling the entire device to operate effectively. Specifically, the top fixing member 2, driven by a hydraulic rod 4, can precisely fix the sand box 5 from above, ensuring the stability and reliability of the sand box 5 during the vibration compaction process. This design of the vibration compaction device not only improves casting efficiency but also significantly enhances the quality of the castings through precise control of the vibration and fixing process.
[0026] Furthermore, the top fixing member 2 includes a top plate 21 and a groove 22. The groove 22 is carefully positioned at the bottom of the top plate 21 to ensure correspondence with the top of the sand box 5. Additionally, the bottom surface of the top plate 21 is designed with a certain inclination angle, which slopes along the left and right sides of the top plate 21. The bottom surface of the groove 22 remains parallel to the bottom surface of the top plate 21. This design allows the sand box 5 to be fixed in an inclined manner when downward pressure is applied by the top fixing member 2, thereby enabling more uniform sand distribution during the lost foam filling process, improving the quality and precision of the casting. This design not only optimizes the casting process but also reduces casting defects, ensuring the surface smoothness and structural integrity of the casting.
[0027] It should be noted that the operation process of this embodiment is as follows: First, a layer of molding sand of a specific thickness is laid at the bottom of the sand box 5 using a sand dropper. Next, the treated lost foam is placed inside the sand box 5, and its gate is sealed. Subsequently, the sand dropper continues to add molding sand into the sand box until the sand box 5 is completely filled.
[0028] After the sand box 5 is filled, the hydraulic rod 4 extends, pushing the top fixing member 2 downward. The lowest point of its groove 22 first contacts the top of the sand box 5, and as the hydraulic rod 4 extends further, the top of the sand box 5 completely fits against the bottom surface of the groove 22. At this time, the sand box 5 is tilted, with an tilt angle between 2° and 5°.
[0029] Specifically, during the tilting of the sand box 5, the support platform 12 of the vibrating table 1 also tilts and continues to operate. As the sand box 5 gradually tilts, the cavities of the lost foam are gradually filled with molding sand. The sand box is kept tilted for a period of time to ensure that the molding sand can fully fill the cavities within the lost foam.
[0030] Finally, the hydraulic rod 4 slowly retracts, causing the top fixing part 2 to move upward, and the sand box 5 slowly returns to the horizontal position. During this process, the vibration table 1 continues to work, further ensuring that the molding sand tightly fills the area around the lost foam, preventing the formation of cavities and voids.
[0031] It is worth noting that through the coordinated action of the top fixing component 2, the sand box 5, and the vibration table 1, the sand box 5 is able to maintain its tilted state and continuously vibrate while tilting. This ensures that the molding sand particles, under the combined action of gravity and composite vibration, can achieve compaction of the tilted sand box 5, effectively filling the cavity of the lost foam, thereby improving the uniformity and efficiency of compaction and further enhancing the quality of the castings.
[0032] Furthermore, in some embodiments, the vibration device also includes a frame 3. The frame 3 is fixedly connected to the workbench 6, the hydraulic rod 4 connects the frame 3 and the top fixing member 2, and the vibration table 1 is embedded in the pit of the workbench 6, with the top surface of the vibration table 1 flush with the workbench 6.
[0033] The fixed connection between the frame 3 and the worktable 6 provides stable support for the hydraulic rod 4, and similarly, provides stable support for the top fixing component 2, ensuring the stability of the vibration operation. The design of the vibration table 1 embedded in the pit of the worktable 6 allows the top surface of the vibration table 1 to be kept on the same horizontal plane as the worktable 6, which helps to improve the convenience of operation and the precision of the castings.
[0034] like Figure 3 and Figure 7As shown, in some embodiments, the vibration table 1 includes support rods 11, a support platform 12, and a base 15. Two support rods 11 are mounted on the support platform 12, arranged parallel to each other, and connected to the bottom of the sand box 5. Furthermore, the arrangement of the support rods 11 allows for the even distribution of vibrational force, ensuring a consistent compaction effect across the entire bottom of the sand box 5. This design allows the vibration table 1 to effectively transmit vibrational energy to every corner of the sand box 5 during operation, ensuring that the sand particles are fully compacted during vibration, thereby improving the quality of the castings.
[0035] Specifically, damping elements 13 are provided at each of the four corners between the support platform 12 and the base 15. These damping elements 13 absorb the vibration energy generated by the vibration table 1 during operation, reducing the impact of vibration on the surrounding environment and protecting the equipment from damage. Through this design, the vibration energy generated by the vibration table 1 during operation is effectively absorbed and buffered, thereby avoiding negative impacts on the surrounding environment and the equipment.
[0036] Furthermore, when the sandbox 5 tilts, the support rod 11 and the support platform 12 will tilt along with it. This requires the damping component 13 to shorten its length under pressure to ensure that the support platform 12 can tilt smoothly.
[0037] Finally, vertical vibration motors 14 are fixed to the sides of the support platform 12. These vertical vibration motors 14 are responsible for generating vertical vibration to further enhance the compactness of the molding sand particles inside the sand box 5. The vertical vibration motors 14 enable the vibration table 1 to generate vertical vibration, which is crucial for improving the compactness of the sand particles and the precision of the castings. A horizontal vibration motor 16 is provided at the bottom of the support platform 12. The horizontal vibration motor 16 is responsible for generating horizontal vibration to ensure that the sand particles inside the sand box 5 are evenly distributed, thereby achieving a better casting effect. The addition of the horizontal vibration motor 16 ensures that the sand particles inside the sand box 5 are also fully compacted in the horizontal direction, which is also crucial for filling the lost foam cavity.
[0038] In this embodiment, the use of horizontal vibration motor 16 and vertical vibration motor 14 achieves multi-phase composite vibration, and in conjunction with the tilt of the box 5, achieves multi-dimensional vibration, further improving the density and uniformity of the molding sand filling.
[0039] exist Figure 4 , Figure 5 and Figure 6As shown, in some embodiments, the top fixing member 2 further includes a sand passage hole 23, which is located in the central region of the top plate 21. Hydraulic rods 4 are symmetrically arranged on both sides of the sand passage hole 23. The main function of the sand passage hole 23 is to facilitate observation of the molding sand height in the sand box 5, and to allow for continued filling of molding sand into the sand box 5 via a sand dropper.
[0040] Specifically, the design of the sand hole 23 allows the operator to directly observe the molding sand filling inside the sand box 5, ensuring uniform distribution and reaching the required height. Furthermore, the presence of the sand hole 23 facilitates the replenishment of molding sand into the sand box 5 as needed during the compaction process, maintaining a sufficient amount of molding sand and ensuring it fully fills the perimeter and cavities of the lost foam. The symmetrical layout of the hydraulic rods 4 ensures that the top fixing component 2 applies pressure evenly to the sand box 5 during operation, thereby stabilizing the position of the sand box 5 during the compaction process.
[0041] like Figure 4 and Figure 7 As shown, in some embodiments, the bottom of the sand box 5 is provided with a limiting groove 51, which is correspondingly provided with the support rod 11. The limiting groove 51 is used to limit the position of the sand box 5. Specifically, this design of the sand box 5 is to ensure that the sand box 5 can be accurately positioned and fixed during the compaction process, thereby ensuring the quality of compaction. The limiting groove 51 has a certain depth, and the support rod 11 is inserted into the limiting groove 51. When the sand box 5 is tilted, the limiting groove 51 can fix the sand box 5 from the bottom, preventing the bottom of the sand box 5 from shifting under gravity during the tilting process.
[0042] In addition, the limiting groove 51 can prevent unnecessary movement of the sand box 5 due to vibration during the compaction process, further ensuring the stability of the molding sand filling process.
[0043] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0044] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.
Claims
1. A tamping device for use in lost foam casting, characterized in that, Including vibration table (1) and top fixing (2), sand box (5) is equipped between vibration table (1) and top fixing (2), top fixing (2) is driven by hydraulic rod (4), to realize the fixation from above to sand box (5); Top fixing (2) includes top plate (21) and recess (22), recess (22) is arranged at the bottom of top plate (21), recess (22) is correspondingly arranged with the top of sand box (5), the bottom surface of top plate (21) is provided with an inclined angle, the bottom surface of recess (22) is parallel with the bottom surface of top plate (21), when top fixing (2) is pressed, sand box (5) is inclined.
2. The jolter for use in lost foam casting according to claim 1, characterized by, It also includes rack (3), rack (3) is fixedly connected with workbench (6), hydraulic rod (4) connects rack (3) and top fixing (2), vibration table (1) is embedded in the pit of workbench (6), the top surface of vibration table (1) is flush with workbench (6).
3. The jolter for use in lost foam casting according to claim 2, characterized by, Vibration table (1) includes support rod (11), support table (12) and base (15), support rod (11) is arranged on support table (12), support rod (11) is provided with two, two support rods (11) are arranged in parallel, support rod (11) is connected with the bottom of sand box (5); Damping member (13) is arranged at the four corners between support table (12) and base (15), vertical vibration motor (14) is respectively fixedly connected with the side surface of support table (12), horizontal vibration motor (16) is arranged at the bottom of support table (12).
4. The jolter for use in lost foam casting according to claim 1, wherein Top fixing (2) further includes sand passing hole (23), sand passing hole (23) is arranged at the middle position of top plate (21), hydraulic rod (4) is symmetrically arranged on both sides of sand passing hole (23).
5. The jolter for use in lost foam casting according to claim 3, wherein The bottom of sand box (5) is provided with limiting groove (51), limiting groove (51) is correspondingly arranged with support rod (11), limiting groove (51) is used for limiting the position of sand box (5).