Space gridding printing method of 3D printing sand mold

A space grid, 3D printing technology, applied in the direction of mold, core, mold components, etc., can solve the problems of unsatisfactory compaction effect, large amount of binder, easy to appear pores, etc., to shorten the baking time, Reduces gas production and improves breathability

Active Publication Date: 2021-08-17

SHENYANG RES INST OF FOUNDRY

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AI-Extracted Technical Summary

Problems solved by technology

[0004] (1) Since there is no compaction method, the compaction effect is not ideal, and the strength can only be increased by adding a binder. The amount of binder added is large, resulting in The sand mold has a large amount of gas generation;

[0005] (2) 3D printed sand molds have poor air permeability and are prone to defects such as pores and inclusions;

[0006] (3) Large sand molds use a large amount of ...

Abstract

The invention relates to a space gridding printing method of a 3D printing sand mold. Regarding a single-material casting sand mold for a large casting, when three-dimensional modeling is carried out on the sand mold for casting, an original solid sand mold has a solid wall thickness with enough size and serves as a "facing sand layer" for resisting scouring resulting from molten metal during pouring, and space gridding is carried out on the other parts, so that the original solid state in the sand mold is changed into space gridding which is supported by multiple groups of space frameworks and is internally provided with loose sand not sprayed with a binder. The characteristic of one-time forming of a complex structure is directly achieved through 3D printing. A 3D printing method for the space gridding sand mold is provided. By changing the structure of a gridding area, "a substitute of the back sand layer" is printed out. According to the method, the gas evolution amount of the sand mold is reduced, the air permeability of the sand mold is improved, the interior of the sand mold is gridded, the addition amount of the binder can be reduced, the baking time of the sand mold is shortened, the cost is saved, and the method is applied to the technical field of casting production.

Application Domain

Additive manufacturing apparatusFoundry moulds +2

Technology Topic

Process engineeringMesh grid +5

Image

Examples

Experimental program(3)

Example Embodiment

[0026] Example one

[0027] The operation procedure and parameters of the spatial grid printing method of the 3D print sand type are as follows:

[0028] Sand-type flank size 800mm × 800mm, high 150mm, the upper portion is R = 500mm curved structure, such as figure 1 Indicated.

[0029] In the first step, the sand-type boundary is left in accordance with the sand type size, and the remainder is divided into space grid, and the sand is divided into various sphere space mesh cavities with a spheroid of 6 mm into a spherical space, each sphere space. 2mm gap is left between the grid cavity as a sand-type support portion (specifically figure 2 ).

[0030] In the second step, import the sand type 3D entity into the 3D printing device computer.

[0031] In the third step, the full sand type is printed with 3D.

[0032] The fourth step is to baking the sand (3 hours at 150 ° C). After the baking is completed, the type sand performance test is performed.

[0033]In the fifth step, it is detected that the sand-type interior grid portion tensile strength is 1.102 MPa, the pressure resistance is 4.250 MPa, the anti-bending strength of 1.342 MPa, the gas permeability 150, the binder is reduced by about 45%.

[0034] In the sixth step, after test casting experiment, the surface of the casting surface has no gas hole defect.

Example Embodiment

[0035] Example 2

[0036] The operation procedure and parameters of the spatial grid printing method of the 3D print sand type are as follows:

[0037] Sand-type flank size 800mm × 800mm, high 150mm, the upper portion is R = 500mm curved structure, such as figure 1 Indicated.

[0038] In the first step, the sand-type boundary is left in accordance with the sand size, and the remainder is divided into space grid, and the sand is divided into various square space grid cavities with a square portion of 6mm. 2mm gap is left between the grid cavity as a sand-type support portion (specifically image 3 ).

[0039] In the second step, import the sand type 3D entity into the 3D printing device computer.

[0040] In the third step, the full sand type is printed with 3D.

[0041] The fourth step is to baking the sand (3 hours at 150 ° C). After the baking is completed, the type sand performance test is performed.

[0042] In the fifth step, it was detected that the sand-type interior grid portion tensile strength was 0.958 MPa, the pressure resistance was 3.59 MPa, the anti-bending strength of 1.108MPa, gas permeability 180, and the binder were reduced by about 42%.

[0043] In the sixth step, after test casting experiment, the surface of the casting surface has no gas hole defect.

Example Embodiment

[0044] Example three

[0045] The operation procedure and parameters of the spatial grid printing method of the 3D print sand type are as follows:

[0046] Sand-type flank size 800mm × 800mm, high 150mm, the upper portion is R = 500mm curved structure, such as figure 1 Indicated.

[0047] In the first step, the sand-type boundary leaves 80mm solid wall thickness according to the sand type, and the remainder is divided into space grid, and the outer ball diameter is used to sequentially decrement the square mesh of 0.2 mm in each layer, in the space from the center department. Arranged by large to a small, the sand-type interior space is divided into a gradient mesh that is different. (Specific Figure 4 ).

[0048] In the second step, import the sand type 3D entity into the 3D printing device computer.

[0049] In the third step, the full sand type is printed with 3D.

[0050] The fourth step is to baking the sand (3 hours at 150 ° C). After the baking is completed, the type sand performance test is performed.

[0051] In the fifth step, the tensile strength is 1.178 MPa, the anti-bending strength is 1.314 MPa, the pressure resistance is 5.121 MPa, the gas permeability is 165, the adhesive added is reduced by 42.2%.

[0052] In the sixth step, after test casting experiment, the surface of the casting surface has no gas hole defect.

[0053] figure 2 and image 3 A represents the edge entity; b represents the spherical cavity; c represents a fill gap; Figure 4 D represents a gradient mesh.

PUM

Property	Measurement	Unit
Tensile strength	1.1	mPa
Compressive strength	4.25	mPa
Bending strength	1.34	mPa

Description & Claims & Application Information

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Space gridding printing method of 3D printing sand mold

A space grid, 3D printing technology, applied in the direction of mold, core, mold components, etc., can solve the problems of unsatisfactory compaction effect, large amount of binder, easy to appear pores, etc., to shorten the baking time, Reduces gas production and improves breathability

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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