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Negative pressure forming process of fusion-cast aluminum oxide green brick and fusion-cast aluminum oxide green brick

A molding process and alumina technology, applied in ceramic molding machines, manufacturing tools, mold auxiliary parts, etc., can solve the problems of pollution, difficult processing, waste of resources and the environment, and achieve broad application prospects, great promotion value, and cost reduction. Effect

Active Publication Date: 2021-06-04
DUJIANGYAN RUITAI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Graphite molds are expensive and difficult to process; the disadvantages of quartz sand molds are poor dimensional accuracy, resulting in large machining allowances and poor appearance quality
The appearance and dimensional accuracy of the magnesia sand mold can meet the requirements, but the cost is high, and the molding sand is for one-time use, and a large amount of industrial waste must be discarded every year, resulting in waste of resources and environmental pollution
It is difficult to prepare sand molds by conventional binder or bonding agent and raw sand molding method. It is difficult to clean up the binder when it is reused, and it will also form waste liquid that is harmful to the environment, which cannot adapt to energy saving. Demand for emission reduction and green development

Method used

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  • Negative pressure forming process of fusion-cast aluminum oxide green brick and fusion-cast aluminum oxide green brick
  • Negative pressure forming process of fusion-cast aluminum oxide green brick and fusion-cast aluminum oxide green brick
  • Negative pressure forming process of fusion-cast aluminum oxide green brick and fusion-cast aluminum oxide green brick

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example-Basic Steps of Alumina Brick Blank Negative Pressure Forming Technology and Its Optimization

[0043] A negative pressure molding process for fused alumina brick embryos, comprising the following steps:

[0044] A. Make a mold according to the shape of the alumina brick embryo. There is a cavity in the middle of the mold. The outer surface and bottom surface of the mold are densely covered with air extraction holes that communicate with the cavity. The cavity is equipped with an air extraction pipe corresponding to the top surface of the mold. It is understandable that , the mold is set as a cavity and the outer surface and the bottom surface are densely covered with air holes, and the attached film can be attached to the surface of the mold by vacuuming.

[0045] B. Attach a film on the outer surface and bottom surface of the mold; it should be noted that the outer surface and bottom surface of the mold referred to here means that the middle surface of the mold...

Embodiment 2

[0074] Embodiment two molding sand quality control

[0075] Since the casting temperature of α-β alumina melt is very high, it is at least 150°C higher than that of AZS and other casting materials. Sand molding sand first requires SiO 2 It has high purity and high refractoriness to withstand the high temperature of the molten casting material. Secondly, it requires a finer grain size of the molding sand to meet the needs of molding processes such as good fluidity and high filling compactness. Experimental research shows that the moisture content of the new sand mold sand should be strictly controlled below 0.5-1%, otherwise "honeycomb" will appear in the sand mold during use, which will cause the box to collapse easily during casting. The new type of sand mold is suitable to use quartz sand whose particle size does not exceed a certain number of meshes. Two or more types of quartz sand cannot be mixed. After the mixed quartz sand is filled in the sand box, "segregation" will ...

Embodiment 3

[0079] Example 3 Negative pressure and time control of sand mold

[0080] As attached to the manual Figure 2~3 As shown, the negative pressure control of the sand mold mainly depends on the two aspects of vacuum flow and time. Fill the sand box with dry quartz sand without binders and additives, start the vibrating table, shake the molding sand in the sand box, seal the lid of the sand box, open the air extraction valve, and extract the air in the sand. Create a pressure difference inside and outside the sand mold. Due to the effect of pressure difference or negative pressure, the sand mold has high hardness, and the reading of the sand mold hardness tester can generally reach 90-95. After the hardness of the molding sand in the sand box is stable, the sand molding is completed.

[0081] The relationship between the physical consolidation hardness of the molding sand and the pumping flow rate and pumping time of the vacuum system is as follows: image 3 shown. When the a...

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Abstract

The invention relates to the technical field of refractory brick processing and forming, discloses a negative-pressure forming process of a fusion-cast aluminum oxide green brick and provides the aluminum oxide green brick prepared by adopting the negative-pressure forming process. According to the negative-pressure forming process, firstly, a mold with attached films and a molding box with a preset air exhaust frame are manufactured under negative pressure, the mold is placed into the molding box, molding sand is poured into the molding box, a top film is laid, and airtight connection is conducted; before casting operation, vacuumizing is conducted through the air exhaust frame to form negative pressure, the pressure is kept, the mold stops air exhausting and is lifted out, a required green brick molding cavity is obtained, and modeling is completed. after casting is finished and the surface of a casting is cooled to form a hard shell, the negative pressure environment is canceled, the air exhaust frame is pulled out, and then the molding sand is collapsed; recycling of the molding sand is achieved, and meanwhile, the formation size and precision requirements of the green brick are guaranteed; and procedures are simplified, cost is reduced, energy is saved, emission is reduced, and great popularization value and wide application prospects are achieved.

Description

technical field [0001] The invention relates to the technical field of refractory brick processing and molding, in particular to a negative pressure molding process of fused alumina brick embryos. Background technique [0002] After the batch of refractory raw materials is melted at a temperature higher than the melting temperature of the material, it is cast in a prefabricated refractory model, and the product formed by cooling and solidifying to make the crystal structure grow and grow is called a fused cast refractory material. Since fused-cast refractory materials have a series of excellent properties such as compact structure, high mechanical strength, glass erosion resistance, and can manufacture products with a larger size than ordinary sintered bricks, the original purpose is to improve the service life of glass industry furnaces and improve glass products. The quality has developed rapidly since it came out, and its variety, output and quality have been continuously...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B28B1/54B28B7/00B28B7/34
CPCB28B1/54B28B7/342B28B7/346B28B7/0008
Inventor 何泽洪张鑫赵奇罗凯刘通权杨清国王飞廖芳俊
Owner DUJIANGYAN RUITAI TECH
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