Environment-friendly and low-cost 3D printing sand mold structure

Abstract

The utility model discloses an environment-friendly and low-cost 3D printing sand mold structure which comprises a shell, the interior of the shell is of a cavity structure, a sand cleaning opening is formed in one end of the shell, a cover plate capable of being fixed to the shell is arranged at the sand cleaning opening, and a supporting framework is arranged in the shell. According to the whole structure, the printing weight is greatly reduced, the use of resin and a curing agent is reduced, the cost is reduced, and in the follow-up casting process, due to the fact that the interior of the sand mold is of a cavity structure, the risk of air hole invasion of a casting can be reduced.

Description

Technical Field

[0001] The utility model relates to an environmentally friendly and low-cost 3D printing sand mold structure, belonging to the technical field of casting equipment. Background Art

[0002] Sand casting is a traditional casting process that uses sand as the main molding material to make molds. Sand molds generally use gravity casting, and low-pressure casting, centrifugal casting and other processes can also be used when there are special requirements. Sand casting has a wide adaptability, and can be used for small parts, large parts, simple parts, complex parts, single-piece and large-batch production. Because the refractory degree of sand molds is very high, this process is also mostly used for materials with relatively high melting points such as copper alloys and ferrous metals.

[0003] In recent years, with the development of 3D printing technology, many castings are now developed and produced using 3D printed sand molds. However, the gas evolution of 3D printed sand molds is higher than that of traditional resin sand molding, and the raw materials such as resin, curing agent and original sand used in 3D printed sand molds are also much more expensive than those of traditional resin sand molding.

[0004] Therefore, we propose an environmentally friendly and low-cost 3D printing sand mold structure. Summary of the Utility Model

[0005] The purpose of the utility model is to provide an environmentally friendly and low-cost 3D printing sand mold structure, which reduces the process difficulty, improves the work efficiency, reduces the gas evolution of the 3D printing sand mold, and can effectively reduce the cost.

[0006] To solve the above technical problems, the utility model adopts the following technical scheme: an environmentally friendly and low-cost 3D printing sand mold structure, including a shell, the shell is a sand mold made by 3D printing, the interior of the shell is a cavity structure, and one end of the shell is provided with a sand cleaning port, a cover plate that can be fixed to the shell is arranged at the sand cleaning port, and a support skeleton is arranged inside the shell, and the support skeleton plays a supporting role for the shell.

[0007] For the above-mentioned environmentally friendly and low-cost 3D printing sand mold structure, the support skeleton forms an intersecting lattice structure in the inner cavity of the shell, and the support points of the support skeleton are evenly distributed along the inner wall of the shell, which improves the overall lateral stiffness of the shell structure and ensures the stability of the shell.

[0008] For the above-mentioned environmentally friendly and low-cost 3D printing sand mold structure, the shell has a stressed skin structure, which improves the compressive capacity of the shell's bearing surface.

[0009] For the above-mentioned environmentally friendly and low-cost 3D printing sand mold structure, the cover plate and the shell adopt a detachable connection structure, which can facilitate the disassembly, installation and fixation of the cover plate.

[0010] The aforementioned environmentally friendly and low-cost 3D printed sand mold structure, the contact surface between the cover plate and the outer shell is sealed to prevent molten aluminum from entering during the later casting process.

[0011] The aforementioned environmentally friendly and low-cost 3D printed sand mold structure, the support skeleton is provided with support points that can closely fit with the cover plate, so that the support skeleton plays a supporting role on the cover plate and improves the compressive performance of the cover plate.

[0012] Compared with the prior art, the present utility model has at least the following beneficial effects:

[0013] (1) The present utility model uses a sand mold 3D printer to replace the traditional mold making, molding, and core making processes, reducing the process difficulty and improving work efficiency;

[0014] (2) The present utility model can effectively reduce the weight of the sand mold. According to different sand mold sizes and structural characteristics, the weight can be reduced by 30%-60%; that is, the production raw material cost can be reduced by 30-60% while effectively reducing costs;

[0015] (3) The cavity of the internal lattice of the present utility model is equivalent to an exhaust structure, which can effectively reduce the risk of the casting generating penetration pores and reduce the gas evolution amount of the 3D printed sand mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the present utility model;

[0017] Figure 2 is a schematic cross-sectional internal structure diagram of the present utility model.

[0018] Reference numerals: 1 - outer shell, 2 - sand cleaning port, 3 - cover plate, 4 - support skeleton.

[0019] The following further describes the present utility model in conjunction with the drawings and specific embodiments. SPECIFIC EMBODIMENTS

[0020] Embodiment 1 of the present utility model: An environmentally friendly and low-cost 3D printed sand mold structure, including an outer shell 1, the outer shell 1 is a sand mold made by 3D printing, the interior of the outer shell 1 has a cavity structure, the cavity structure is equivalent to an exhaust structure, and one end of the outer shell 1 is provided with a sand cleaning port 2, through which the sand in the cavity part inside the outer shell 1 can be cleared. A cover plate 3 that can be fixed to the outer shell 1 is provided at the sand cleaning port 2, and the cover plate 3 can seal the sand cleaning port 2 to prevent molten aluminum from entering during the later casting process. A support skeleton 4 is arranged inside the outer shell 1, and the support skeleton 4 plays a supporting role on the outer shell 1, enabling the outer shell 1 to resist the pressure generated during the casting process.

[0021] Embodiment 2 of the present utility model: An environmentally friendly and low-cost 3D printed sand mold structure, including a housing 1. The housing 1 is a sand mold made by 3D printing. The interior of the housing 1 has a cavity structure, which is equivalent to an exhaust structure. And one end of the housing 1 is provided with a sand cleaning port 2, through which the sand in the cavity part inside the housing 1 can be cleared. A cover plate 3 that can be fixed to the housing 1 is arranged at the sand cleaning port 2. The cover plate 3 can seal the sand cleaning port 2 to prevent molten aluminum from entering during the later casting process. A support skeleton 4 is arranged inside the housing 1. The support skeleton 4 plays a supporting role for the housing 1, enabling the housing 1 to resist the pressure generated during the casting process.

[0022] The support skeleton 4 forms an intersecting lattice structure in the inner cavity of the housing 1, and the support points of the support skeleton 4 are evenly distributed along the inner wall of the housing 1, improving the overall lateral stiffness resistance of the housing 1 structure and ensuring the stability of the housing 1; the housing 1 has a stressed skin structure, improving the compressive capacity of the housing 1 in the plane. The support skeleton 4 forms longitudinal and transverse ribs that intersect with each other in the inner cavity space of the housing 1. The housing 1 uses a skin structure to cover the outside of the support skeleton 4 to form a common action system. The skin structure can withstand in-plane tensile, compressive, and shear stresses, which is equivalent to continuously distributed supports, achieving the effect of spatial force. Utilizing the shear resistance of the skin can greatly improve the overall lateral stiffness resistance of the structure, reduce the setting of lateral supports, and utilize the skin effect of the housing 1, which not only makes full use of the strength of the plate material of the housing 1 but also plays an auxiliary supporting role for the support skeleton 4, greatly improving the overall stiffness.

[0023] Embodiment 3 of the present utility model: An environmentally friendly and low-cost 3D printed sand mold structure, including a housing 1. The housing 1 is a sand mold made by 3D printing. The interior of the housing 1 has a cavity structure, which is equivalent to an exhaust structure. And one end of the housing 1 is provided with a sand cleaning port 2, through which the sand in the cavity part inside the housing 1 can be cleared. A cover plate 3 that can be fixed to the housing 1 is arranged at the sand cleaning port 2. The cover plate 3 can seal the sand cleaning port 2 to prevent molten aluminum from entering during the later casting process. A support skeleton 4 is arranged inside the housing 1. The support skeleton 4 plays a supporting role for the housing 1, enabling the housing 1 to resist the pressure generated during the casting process; the cover plate 3 and the housing 1 adopt a detachable connection structure, which can facilitate the disassembly, installation, and fixation of the cover plate 3; the contact surface between the cover plate 3 and the housing 1 is sealed to prevent molten aluminum from entering during the later casting process. The support skeleton 4 is provided with support points that can closely fit the cover plate 3, enabling the support skeleton 4 to play a supporting role for the cover plate 3 and improving the compressive performance of the cover plate 3.

[0024] The support framework 4 forms a cross-shaped lattice structure within the inner cavity of the outer shell 1, and the support points of the support framework 4 are evenly distributed along the inner wall of the outer shell 1, enhancing the overall lateral stiffness resistance of the structure of the outer shell 1 and ensuring the stability of the outer shell 1; the outer shell 1 is a stressed skin structure, improving the compressive capacity of the outer shell 1 under surface pressure. The support framework 4 forms vertical and horizontal ribs that intersect with each other within the inner cavity space of the outer shell 1. The outer shell 1 is covered with a skin structure outside the support framework 4 to form a co-acting system. The skin structure can withstand in-plane tensile, compressive, and shear stresses, acting as a continuously distributed support and achieving the effect of spatial force-bearing. Utilizing the shear resistance of the skin can greatly enhance the overall lateral stiffness resistance of the structure, reduce the setting of lateral supports, and by taking advantage of the skin effect of the outer shell 1, not only fully utilize the strength of the plate material of the outer shell 1 but also play an auxiliary support role for the support framework 4, significantly improving the overall stiffness.

[0025] The working principle of an embodiment of the present utility model: When the present utility model is used in sand mold printing, combining the advantages of 3D printing, the outer shell 1 is made into a skin structure, and the interior is made into a cross-shaped lattice-like support framework 4; after printing is completed, the sand in the inner cavity part of the outer shell 1 is cleared out from the reserved sand cleaning port 2 and recycled. After cleaning, the sand cleaning port 2 is covered with a cover plate 3 to prevent molten aluminum from entering the outer shell 1 during the subsequent casting process; the overall structure of the present utility model significantly reduces the printing weight, reduces the use of resin and curing agent, reduces costs, and during the subsequent casting process, since the inside of the sand mold is a cavity structure, it can also reduce the risk of the casting generating intrusion air holes.

Claims

1. An environmentally friendly and low-cost 3D printing sand mold structure, characterized in that: The invention comprises a shell (1), the interior of the shell (1) forms a cavity structure, one end of the shell (1) is provided with a sand cleaning port (2), the sand cleaning port (2) is provided with a cover plate (3) which can be fixed to the shell (1), and a supporting frame (4) is provided inside the shell (1).

2. An environmentally friendly and low-cost 3D printing sand mold structure according to claim 1, characterized in that: The support frame (4) forms a cross lattice structure in the inner cavity of the outer shell (1), and the support points of the support frame (4) are evenly distributed along the inner wall of the outer shell (1).

3. An environmentally friendly and low-cost 3D printing sand mold structure according to claim 2, characterized in that: The outer shell (1) is a stress skin structure.

4. The environmentally friendly and low-cost 3D printing sand mold structure according to claim 3, characterized in that: The cover plate (3) and the outer shell (1) adopt a detachable connection structure.

5. The environmentally friendly and low-cost 3D printing sand mold structure according to claim 4, characterized in that: The contact surface between the cover plate (3) and the housing (1) is in a sealed state.

6. The environmentally friendly and low-cost 3D printing sand mold structure according to claim 5, characterized in that: The support frame (4) is provided with support points that can fit tightly with the cover plate (3).

Images