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Rapid manufacturing method for sprayed and cured molding sand

A manufacturing method and curing technology, which are used in manufacturing tools, machinery for cleaning/processing of casting materials, casting and other directions. Wide range of effects

Inactive Publication Date: 2015-10-28
宁波高新区多维时空科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In view of the above-mentioned defects in the prior art, the technical problem to be solved by the present invention is to provide a rapid manufacturing method of spray-cured molding sand, reduce the amount of resin used to avoid the problem of excessive gas generation in the mold, prevent the blockage of the nozzle device, and speed up the production process. Solidification speed, improve the assembly quality of molds and cores, and obtain higher strength molds

Method used

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  • Rapid manufacturing method for sprayed and cured molding sand
  • Rapid manufacturing method for sprayed and cured molding sand
  • Rapid manufacturing method for sprayed and cured molding sand

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052]Configure molding sand covered with benzenesulfonic acid: use casting silica sand with a particle size of 70-140 mesh as the molding sand, and use a sand mixer or other equipment to mix the molding sand and benzenesulfonic acid at a ratio of 100:1.5, that is, the amount of benzenesulfonic acid added is 1.5% by weight of molding sand.

[0053] Prepare diluted furan resin: Stir and mix furan resin and absolute ethanol using a liquid mixer or other equipment. The weight ratio of furan resin to absolute ethanol is 100:15, that is, absolute ethanol accounts for 15% of the furan resin.

[0054] Rapid manufacturing is achieved by spraying solidified sand, specifically the following steps:

[0055] (a) set up a three-dimensional model of the sand mold in the computer, and carry out layering and data processing on the model; clean up the floating sand on the frame and above of the work surface 4, so that the working area of ​​the molding cylinder 1 range is clean and free of floa...

Embodiment 2

[0062] Configure molding sand covered with p-toluenesulfonic acid: the particle size of the molding sand is 30-50 mesh, use a sand mixer to mix the molding sand and p-toluenesulfonic acid at a ratio of 100:3, that is, the amount of p-toluenesulfonic acid added is the weight of the molding sand 3 %.

[0063] Prepare diluted furan resin: Stir and mix furan resin and isopropanol, the weight ratio of furan resin and isopropanol is 100:20, that is, isopropanol accounts for 20% of furan resin.

[0064] Different from Example 1, in this example, before the process of casting mold entity preparation, a certain thickness of underlying molding sand is first laid on the powder bed 3 to prevent the subsequent molding sand from sticking to the powder bed 3 during solidification and affecting removal.

[0065] Rapid manufacturing is achieved by spraying solidified sand, specifically the following steps:

[0066] (a) set up a three-dimensional model of the sand mold in the computer, and car...

Embodiment 3

[0074] Configure molding sand covered with xylene sulfonic acid: the particle size of the molding sand is 100-200 mesh, use a sand mixer or other equipment to mix the molding sand and xylene sulfonic acid at a ratio of 100:0.5, that is, the amount of xylene sulfonic acid added is 0.1% by weight of molding sand.

[0075] Configure the diluted phenolic resin: mix the phenolic resin and absolute ethanol with a liquid mixer or other equipment. The weight ratio of the phenolic resin to the absolute ethanol is 100:5, that is, the absolute ethanol accounts for 5% of the phenolic resin.

[0076] Rapid manufacturing is achieved by spraying solidified sand, specifically the following steps:

[0077] (a) set up a three-dimensional model of the sand mold in the computer, and carry out layering and data processing on the model; clean up the floating sand on the frame and above of the work surface 4, so that the working area of ​​the molding cylinder 1 range is clean and free of floating sa...

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Abstract

The invention discloses a rapid manufacturing method for sprayed and cured molding sand. The rapid manufacturing method is characterized by comprising the following steps: molding sand is mixed with a curing agent in advance, and diluted resin is sprayed onto the molding sand mixed with the curing agent through a spray; through powder layering and resin spraying, the molding sand with sprayed resin is cured, and then adhesive forming is realized; the formed layers are heated for drying; the entity of a casting mold is formed through layer-by-layer printing, stacking and curing, and then the strength of the casting mold is improved through further drying. Through adoption of the rapid manufacturing method, the problem that the amount of gas evolution of the casting mold is overlarge can be solved through reduction of the resin consumption, the spray is protected from blockage, the curing speed is increased, the assembly quality of the casting mold and a mold core is improved, and finally the casting mold with relatively high strength is obtained.

Description

technical field [0001] The invention relates to rapid prototyping technology, in particular to a rapid manufacturing method of spray-solidified molding sand. Background technique [0002] 3D printing is a kind of rapid prototyping technology. It is based on digital model files and uses bondable materials such as powdered metal or plastic to construct objects by layer-by-layer printing, forming "digital manufacturing". [0003] 3D printing technology is based on the computer three-dimensional design model, through the software layered discrete and numerical control forming system, using laser beams, hot-melt nozzles, etc. to accumulate metal powder, ceramic powder, plastic, cell tissue and other special materials layer by layer Bonding, and finally overlaying and molding to create a solid product. Unlike the traditional manufacturing industry, which shapes and cuts raw materials through mechanical processing methods such as moulds, turning and milling to finally produce fini...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/02B22C5/12
Inventor 张涛张远明贺挺
Owner 宁波高新区多维时空科技有限公司
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