Sand box for lost foam casting

Abstract

The utility model relates to the technical field of lost foam casting, in particular to a sand box for lost foam casting, which comprises an outer box and an inner box, the air net is arranged in the inner box; the sealing grooves are formed in the two sides of the interior of the inner box; the sealing frame is fixed on the outer surface of the gas net; the ventage penetrates through the bottom of the inner box; the bolt penetrates through the bottom of the outer box in a threaded manner; the sealing block is fixed at the top end of the bolt; the through opening penetrates through the two sides of the inner box, and the air net is located on one side of the through opening; and the cavity is formed in the inner wall of the outer box. According to the utility model, the defects in the prior art are overcome, through the arrangement of the sealing frame and the sealing groove, the sealing performance of connection can be achieved through the matching of the structures, the clamping stability of the gas net can be ensured, and meanwhile, the gas net is convenient to detach and clean by personnel; and by arranging a bolt, a sealing block and a leakage opening, the personnel can be assisted in taking out the inner box from the interior of the outer box conveniently, and meanwhile, the personnel can be assisted in taking out the casting from dry quartz sand in the inner box.

Description

Technical Field

[0001] The utility model relates to the technical field of lost foam casting, in particular to a sand box for lost foam casting. Background Art

[0002] Lost foam casting refers to a special type of sand mold used in the lost foam casting process. Lost foam casting, also known as wax casting or dewaxing casting, is a commonly used precision casting method used to manufacture castings with complex shapes or detailed requirements. The sand box for lost foam casting refers to a special sand box used to make the above-mentioned sand cores.

[0003] According to the publication number CN219598024U, a sand box for lost foam casting includes an inner sand box and an outer sand box, the inner sand box is fixed in the outer sand box, and the side wall and bottom of the inner sand box correspond to the side wall and bottom of the outer sand box to leave a gap and form a chamber; by adopting the above structure, the problem of frequent replacement of the stainless steel mesh on the side wall of the traditional sand box is solved, saving costs, time and labor, and convenient and quick installation. By combining the above references, it is found that the existing sand box for lost foam casting has at least the following problems:

[0004] 1. By using the air net and vacuum pump to create negative pressure inside the sand box, the bubbles in the dry quartz sand are removed and the density of the dry quartz sand and the model is improved. However, the mesh of the air net may be blocked by the dry quartz sand, which will reduce the subsequent operation efficiency, and the air net cannot be easily cleaned from inside the sand box;

[0005] 2. When the sand box is filled with dry quartz sand, the inside of the sand box is heavy and it is not easy to take the cast castings out of the sand box. Utility Model Content

[0006] The utility model aims to provide a sand box for lost foam casting, so as to solve the problems in the use of the sand box for lost foam casting proposed in the above background technology.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A sand box for lost foam casting, comprising: an outer box and an inner box;

[0009] An air net, which is arranged inside the inner box;

[0010] Sealing grooves are provided on both sides of the inner box;

[0011] A sealing frame fixed to the outer surface of the air net;

[0012] A leak, which runs through the bottom of the inner box;

[0013] a bolt, the thread of which penetrates the bottom of the outer box;

[0014] A sealing block is fixed to the top end of the bolt.

[0015] Preferably, a through opening is provided which runs through both sides of the inner box, and the air net is located on one side of the through opening;

[0016] A cavity, which is opened on the inner wall of the outer box;

[0017] An air extraction joint, which penetrates and communicates with the outer box;

[0018] The supporting feet are installed on the bottom of the outer box.

[0019] Preferably, the sealing groove is opened around one side of the through opening located inside the inner box, and the space of the sealing groove gradually decreases from the outside to the inside.

[0020] Preferably, the inner box is inserted into the outer box, and a sealing layer is provided at the connection between the inner box and the outer box.

[0021] Preferably, the cavities are opened on the four inner walls of the outer box, and the cavities opened on the four walls are connected.

[0022] Preferably, the supporting feet are installed in four groups and are installed at the four corners of the bottom of the outer box, and rubber pads are provided at the ends of the supporting feet that contact the ground.

[0023] Preferably, two groups of the air nets are provided, and the two groups of the air nets are designed in a mirror image with the longitudinal axis of the inner box as the center.

[0024] The embodiment of the utility model provides a sand box for lost foam casting, which has the following beneficial effects:

[0025] 1. By setting up a sealing frame and a sealing groove, after the dry quartz sand and castings in the inner box are taken away, the personnel pull the air net inside the inner box, and the air net drives the sealing frame to separate from the sealing groove. At the same time, the internal space of the sealing groove gradually decreases, which makes it easier for the sealing frame to be stuck in the sealing groove. The cooperation of these structures can not only achieve the sealing performance of the connection, but also make the air net stuck stably, and at the same time it is convenient for personnel to remove the air net for cleaning.

[0026] 2. By setting bolts, sealing blocks and leaks, personnel turn the bolts, the bolts drive the sealing block to separate from the leak, and take the sealing block out of the outer box, the dry quartz sand in the inner box is discharged from the leak and the connection between the bolts and the outer box, and the weight of the inner box is reduced by reducing the dry quartz sand inside the inner box, which makes it convenient for assistants to take the inner box out of the outer box, and also helps assistants to take the castings out of the dry quartz sand in the inner box. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0028] Figure 1 It is a schematic diagram of the structure of the utility model;

[0029] Figure 2 This is a schematic diagram of the split structure of the gas network of the present invention;

[0030] Figure 3 This is a schematic diagram of the cross-sectional structure of the practical sand box;

[0031] Figure 4 This is a practical Figure 3 Enlarged structural diagram at A in the middle.

[0032] In the figure: 1. outer box; 2. inner box; 3. through port; 4. sealing groove; 5. air net; 6. sealing frame; 7. cavity; 8. leakage port; 9. bolt; 10. sealing block; 11. exhaust joint; 12. support foot. Implementation

[0033] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0034] Example: Figure 1As shown, a sand box for lost foam casting comprises: an outer box 1 and an inner box 2, both of which are sand box bodies for lost foam casting; at the same time, the outer box 1 and the inner box 2 are combined into a sand box; and a sealing layer is provided at the connection between the box openings of the outer box 1 and the inner box 2 to prevent leakage when the inner box 2 is exhausted; the outer box 1 is the external structure of the sand box, and the outer box 1 provides support and stability for the entire sand box to ensure that no deformation or tilting occurs during the casting process; the inner box 2 is the internal structure of the sand box, and the inner box 2 provides a space for accommodating a model and dry quartz sand, so that the model can be correctly placed and fixed according to the design requirements; an exhaust joint 11 is passed through one side of the outer box 1; the exhaust joint 11 can be connected to an external vacuum pump; during the lost foam casting process, there will be a certain gap between the model and the dry quartz sand, and these gaps may cause pores or defects in the casting; the exhaust joint 11 is connected to the Connecting a vacuum pump to extract the gas in the gap can effectively reduce or eliminate the generation of pores and defects. At the same time, after the gas in the gap is extracted, the dry quartz sand can fill the surface and fine details of the model more tightly, thereby improving the compactness of the model, which helps to ensure the accuracy and surface quality of the casting. Support feet 12 with rubber pads are installed at the four corners of the bottom of the outer box 1. The support feet 12 provide stable support for the outer box 1 so that it can maintain balance and stability during use. Air nets 5 are installed on both sides of the interior of the inner box 2. The air net 5 can block the flow of dry quartz sand. During the casting process, dry quartz sand is injected into the inner box 2, and the air net 5 can prevent the sand from flowing into the cavity 7, ensuring that the sand is evenly distributed inside the inner box 2. In addition to blocking dry quartz sand, the air net 5 also allows internal air to be discharged from the inner box 2 through its mesh.

[0035] like Figure 2 As shown, it includes: both sides of the inner box 2 are penetrated by through openings 3, the through openings 3 are used to cooperate with the gas discharge channel, and a sealing groove 4 is opened on one side of the through opening 3 inside the inner box 2, and at the same time, the gas net 5 is inserted into the sealing groove 4 through a sealing frame 6 fixed on the outer surface. As the space of the sealing groove 4 gradually shrinks from the outside to the inside, the gas net inserted into the sealing frame is firmly fixed in the inner box 2, and at the same time, the cooperation between the sealing frame 6 and the sealing groove 4 can prevent the gas in the inner box 2 from being unable to be discharged.

[0036] like Figure 3 and Figure 4As shown, it includes: cavities 7 are opened on the four walls of the outer box 1, and they are all connected. When the external air extraction joint is connected to the vacuum equipment, the gas in the gap of the dry quartz sand in the inner box 2 is pumped out and discharged through the air net 5, the port 3, the cavity 7 and the air extraction joint 11, thereby making the dry quartz sand compact. A leak 8 is penetrated at the bottom of the inner box 2, and a bolt 9 is threadedly penetrated and connected at the bottom of the outer box 1. A sealing block 10 is fixed on the top of the bolt 9, and the sealing block 10 is sealed in the leak 8. The function of the bolt 9 and the sealing block 10 is to ensure the sealing between the inner box 2 and the outer box 1. When the bolt 9 is tightened, the seal The sealing block 10 will be pushed into the leak 8 to form a seal to prevent gas from leaking from the bottom of the inner box 2 to the external environment. At the same time, when the personnel drive the sealing block 10 to separate from the leak 8 with the bolt 9, and the bolt 9 and the sealing block 10 are moved out of the outer box 1, the dry quartz sand that has completed the operation is discharged from the leak 8 and the connection with the bolt 9. When the dry quartz sand inside the inner box 2 is reduced, the weight of the inner box 2 is reduced and it is convenient for personnel to take out the casting formed in the inner box 2. The leak 8 assists personnel to conveniently take out the inner box 2 from the inside of the outer box. At the same time, since the dry quartz sand in the inner box 2 is reduced, it is also convenient to take out the casting.

[0037] Working principle: The staff puts the model in the inner box 2, wraps the model by adding dry quartz sand, and compacts the dry quartz sand on the top, then connects to the external vacuum equipment through the exhaust joint 11, and the gas in the inner box 2 is discharged through the gas network 5, the port 3, the cavity 7 and the exhaust joint 11, and the inner box 2 is vacuumed to compact the dry quartz sand and the model. The staff fills the model with high-temperature materials, and the model is oxidized at high temperature to form a casting. When the casting needs to be taken out after cooling, the staff turns the bolt 9, and the bolt 9 drives the sealing block 10 to separate from the leak 8, and the sealing block 10 is taken out from the outer box 1, and the inner box 2 The dry quartz sand is discharged from the leak 8 and the connection between the bolt 9 and the outer box 1. By reducing the dry quartz sand inside the inner box 2, the weight of the inner box 2 is reduced. Then the inner box 2 is taken out from the outer box, the casting is taken out, and the dry quartz sand is discharged from the inner box 2 and the air net 5 is pulled. The air net 5 drives the sealing frame 6 to separate from the sealing groove 4. After cleaning the air net 5, the sealing frame 6 is clamped into the sealing groove 4 again. Since the internal space of the sealing groove 4 is gradually reduced, it is convenient for the sealing frame 6 to be clamped inside the sealing groove 4. The personnel reinsert the inner box 2 into the outer box 1 and turn the bolt 9. The bolt 9 drives the sealing block 10 to seal the leak 8 again.

[0038] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A sand box for lost foam casting, characterized in that: include: Outer box (1) and inner box (2); An air net (5) disposed inside the inner box (2); Sealing grooves (4) are provided on both sides of the inner box (2); A sealing frame (6) fixed to the outer surface of the air net (5); A leak (8) extending through the bottom of the inner box (2); A bolt (9) having a thread extending through the bottom of the outer box (1); A sealing block (10) is fixed to the top end of the bolt (9).

2. The lost foam casting sand box according to claim 1, characterized in that: A through opening (3) which passes through two sides of the inner box (2), and the air net (5) is located on one side of the through opening (3); A cavity (7) formed on the inner wall of the outer box (1); An air extraction joint (11) which passes through one side of the outer box (1) and extends to communicate with the cavity (7); A support foot (12) is installed on the bottom of the outer box (1).

3. The lost foam casting sand box according to claim 2, characterized in that: The sealing groove (4) is opened around one side of the through opening (3) located inside the inner box (2), and the space of the sealing groove (4) gradually decreases from the outside to the inside.

4. The lost foam casting sand box according to claim 2, characterized in that: The inner box (2) is inserted into the interior of the outer box (1), and a sealing layer is provided at the connection between the box openings of the inner box (2) and the outer box (1).

5. The lost foam casting sand box according to claim 2, characterized in that: The cavity (7) is opened on the four inner walls of the outer box (1), and the cavity (7) opened on the four walls is connected.

6. The lost foam casting sand box according to claim 2, characterized in that: Four groups of the supporting feet (12) are installed and are installed at the four corners of the bottom of the outer box (1), and rubber pads are provided at the ends of the supporting feet (12) that contact the ground.

7. The lost foam casting sand box according to claim 1, characterized in that: Two groups of the air nets (5) are provided, and the two groups of the air nets (5) are designed in a mirror image with the longitudinal axis of the inner box (2) as the center.

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