3D printing sand casting mold

Abstract

The utility model relates to a 3D printing sand casting mould, which comprises a shell and a reinforcing plate, the reinforcing plate is arranged in the shell, the reinforcing plate is flush with the attachment surface of the shell and a printing platform, a plurality of stress holes are arranged on the reinforcing plate, a deformation hole is arranged above the platform surface, facing the printing platform, of the shell, and a filler is arranged in the deformation hole. The sand casting mold has the advantages that the three layers of shells are matched with the reinforcing plates, the stress holes are formed in the reinforcing plates, the mechanical strength of the sand casting mold is ensured while materials are reduced, the printing time is shortened, the deformation holes are formed in the shells, deformation of the deformation holes replaces deformation of edge angles of a platform surface, and the production efficiency is improved. And the condition that the sand-casting mold tilts due to different temperatures of upper and lower layers of materials during printing is avoided.

Description

Technical Field

[0001] This utility model relates to the field of sand casting, and in particular to a 3D printed sand casting mold. Background Technology

[0002] In sand casting, a sand mold is first created using a sand casting mold. Traditional sand casting molds are usually made of wood or metal, which are difficult to manufacture, heavy, prone to deformation, and require regular maintenance. Compared to traditional wood and metal molds, 3D printed sand casting molds have advantages such as shorter production cycles and lower costs. However, 3D printed sand casting molds, especially large ones, have a long printing time, and a significant temperature difference between the upper and lower layers of material. This temperature difference can cause the edges of the printed sand casting mold to curl upwards, affecting the flatness of the mold. After the sand casting molds are assembled, gaps will remain, making it impossible to create an accurate sand mold. Summary of the Invention

[0003] This utility model mainly solves the above-mentioned problems and provides a 3D printed sand casting mold. It adopts a three-layer shell with a reinforcing plate and stress holes are opened on the reinforcing plate. While reducing the material usage, it ensures the mechanical strength of the sand casting mold and shortens the printing time. At the same time, deformation holes are placed on the shell to replace the deformation of the edge corner of the platform surface, thus avoiding the situation of warping corners due to the temperature difference between the upper and lower material layers during printing.

[0004] The technical solution adopted by this utility model to solve its technical problem is a 3D printing sand casting mold, including a shell and a reinforcing plate. The reinforcing plate is disposed in the shell and is flush with the attachment surface of the shell and the printing platform. The reinforcing plate is provided with a plurality of stress holes. The shell is provided with deformation holes above the platform surface facing the printing platform, and the deformation holes are filled with a filling material.

[0005] As a preferred embodiment of the above solution, the shell includes an outer layer, a reinforcing layer, and an inner layer, with the reinforcing layer disposed between the outer layer and the inner layer.

[0006] As a preferred embodiment of the above scheme, the reinforcing layer is distributed in a grid pattern.

[0007] As a preferred embodiment of the above solution, the reinforcing plate includes a transverse reinforcing plate and a longitudinal reinforcing plate, which are arranged in a cross pattern within the shell.

[0008] As a preferred embodiment of the above solution, the reinforcing plate forms a matching convex splicing part and a concave splicing part at the splicing point of the shell.

[0009] As a preferred embodiment of the above solution, the deformation hole corresponds to the edge corner of the platform surface.

[0010] The advantages of this utility model are: it adopts a three-layer shell with a reinforcing plate and stress holes are opened on the reinforcing plate, which reduces the amount of material used while ensuring the mechanical strength of the sand casting mold and shortening the printing time. At the same time, deformation holes are made on the shell, and the deformation of the deformation holes replaces the deformation of the edge corner of the platform surface, so as to avoid the sand casting mold from warping due to the temperature difference between the upper and lower material layers during printing. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the sand casting mold in the embodiment.

[0012] Figure 2 for Figure 1 A magnified view of a portion of region A in the middle.

[0013] Figure 3 This is a schematic diagram of another sand casting mold structure.

[0014] 1-Shell 2-Reinforcing plate 3-Stress hole 4-Attachment surface 5-Deformation hole 6-Sand casting mold. Detailed Implementation

[0015] The technical solution of the present invention will be further described below through embodiments and in conjunction with the accompanying drawings.

[0016] Example:

[0017] This embodiment describes a 3D printed sand casting mold, such as... Figure 1 and Figure 2 As shown, the mold includes a housing 1 and a reinforcing plate 2. The reinforcing plate 2 is disposed within the housing 1 and is flush with the attachment surface 4 between the housing and the printing platform. The housing 1 includes an outer layer, a reinforcing layer, and an inner layer. The reinforcing layer is located between the outer and inner layers and is distributed in a grid pattern. The reinforcing plate 2 includes transverse reinforcing plates and longitudinal reinforcing plates, which are arranged in a cross pattern within the housing. Several stress holes 3 are evenly distributed on the reinforcing plate 2. The stress holes 3 can improve the mechanical strength of the reinforcing plate, thereby effectively supporting the housing and ensuring the mechanical strength of the mold. They can also reduce the overall weight of the mold, lower costs, and for large molds, prevent deformation of the reinforcing plate from causing deformation of the housing.

[0018] Meanwhile, deformation holes 5 are provided on the upper part of the platform surface facing the printing platform on the housing 1. The deformation holes 5 correspond to the edge corners of the platform surface, and are filled with hot melt adhesive. Without deformation holes, during the printing process, due to the large mold and long printing time for each layer, there will be a significant temperature difference between the upper and lower layers of material. Under the influence of thermal expansion and contraction of the material, the edge corners of the platform surface will warp. By placing the deformation holes near the edge corners, the forces of thermal expansion and contraction of the material can be applied to the deformation holes, allowing the deformation holes to replace the edge corner deformation, thus preventing the platform surface from warping. After the mold printing is completed, the deformation holes can be filled with hot melt adhesive to replace them, eliminating the influence of the deformation holes on the sand mold.

[0019] Furthermore, if the 3D printed casting mold is composed of two parts joined together, the reinforcing plate 2 can form matching convex and concave joints at the joint of the shell 1. In this embodiment, the complete casting mold consists of... Figure 1 and Figure 3 The two sand casting molds 6 are joined together, and the attachment surface 4 is the joining surface, such as Figure 1 As shown, the splicing surface consists only of the shell frame and reinforcing plate, with the rest being hollow. This design reduces the planar area of ​​the splicing surface, making it less prone to deformation. In addition, convex and concave splicing parts are respectively provided on the reinforcing plates at the splicing surfaces of the two casting molds. The convex and concave splicing parts further reduce the planar area of ​​the splicing surface and solve the problem of splicing inconvenience caused by the reduction in splicing area.

[0020] In this embodiment, the casting mold is realized by 3D printing. A cavity is formed in the mold by using a shell and a reinforcing plate to make the mold hollow and avoid deformation caused by thermal expansion and contraction of the material. A three-layer shell is used and stress holes are opened on the reinforcing plate to ensure the mechanical strength of the mold. Deformation holes are set at the edge corners of the mold platform surface. During the printing process, the deformation of the deformation holes under the action of thermal expansion and contraction of the material replaces the deformation of the edge corners of the mold platform surface, ensuring that the mold platform surface will not have the problem of warping.

[0021] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A 3D printed sand casting mold, characterized in that: The device includes a housing and a reinforcing plate. The reinforcing plate is disposed in the housing and is flush with the attachment surface of the housing and the printing platform. The reinforcing plate is provided with several stress holes. The housing is provided with deformation holes above the platform surface facing the printing platform, and the deformation holes are filled with a filler.

2. The 3D printed sand casting mold according to claim 1, characterized in that: The shell includes an outer layer, a reinforcing layer, and an inner layer, with the reinforcing layer disposed between the outer layer and the inner layer.

3. The 3D printed sand casting mold according to claim 2, characterized in that: The reinforcing layer is distributed in a grid pattern.

4. The 3D printed sand casting mold according to claim 1, characterized in that: The reinforcing plate includes a transverse reinforcing plate and a longitudinal reinforcing plate, which are arranged in a cross shape within the shell.

5. The 3D printed sand casting mold according to claim 1, characterized in that: The reinforcing plate forms matching convex and concave joints at the joints of the shell.

6. The 3D printed sand casting mold according to claim 1, characterized in that: The deformation hole corresponds to the edge corner of the platform surface.

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