A kind of green lost foam casting method

A lost foam casting and green technology, applied in the direction of casting molding equipment, casting molds, casting mold components, etc., can solve the problems of polluted gas, lost foam denaturation, and difficulty in taking out lost foam, so as to improve the quality of castings and avoid foam plastic denaturation Effect

Active Publication Date: 2018-02-13
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of lost foam solid mold casting, high-temperature molten metal is completely used to vaporize and disappear foam plastics, but there are three major problems in the cast castings: 1) A large amount of carbon formation on the surface of the casting causes its shallow black inclusions; 2) Lost foam gas Gasification produces a large amount of gas, causing casting defects, such as pores; 3) Lost foam gasification produces a large amount of polluting gas, causing environmental pollution
Although the above method is simple and feasible, it is difficult to take out the lost foam after shrinkage by heating and shrinking, and heating may cause the change of lost foam

Method used

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  • A kind of green lost foam casting method
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Examples

Experimental program
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Effect test

Embodiment 16

[0026] A green lost foam casting method, its technological process is shown in figure 1 , including the following steps:

[0027] (1) Selection of foamed plastics: There are three types of foam beads for lost foam casting: 1) Expandable polystyrene resin (EPS); 2) Expandable methyl methacrylate and styrene copolymer resin (STMMA) 3) Expandable polymethyl methacrylate resin (EPMMA). Expandable polystyrene resin (EPS) is commonly used for casting non-ferrous metals, gray iron and general steel casting. The foamed plastic beads are translucent beads, the pre-expansion multiple is 40-60, and the particle size is 0.18-0.80 mm. 10.

[0028] (2) Foaming into a vanishing model: The foamed plastic is molded into a vanishing model through pre-foaming-curing-foaming molding-cooling, and a vanishing model can also be directly made of a foamed plastic sheet.

[0029] (3) The model is combined into a vanishing model cluster: the processed vanishing model and the pouring riser are bonded...

Embodiment 17

[0037] A green lost foam casting method (casting to produce a marine propeller), see figure 2 , the volume is about 2000cm 3 , in the figure 1 is the pouring port, and 2 is the 3 emptying ports.

[0038] The expandable methyl methacrylate and styrene copolymer resin beads (STMMA) are pre-expanded-cured-foamed-molded-cooling to form the disappearance model of the marine propeller, which is combined with the pouring riser and bonded together. Form disappearing model clusters, brush refractory paint on the outer surface of the disappearing model clusters, and dry them so that the refractory coating layer forms a mold shell, add the defoaming liquid of Example 6 into the mold shell through the pouring riser, and defoaming the disappearing model for 30 minutes. The volume is reduced into a mixed liquid, and the mixed liquid is automatically flowed out from the pouring riser and recycled. The mold shell with the pouring riser is vibrated to shape, and the molten metal is poured in...

Embodiment 18

[0041] A green lost foam casting method. Expandable polymethyl methacrylate resin beads (EPMMA) are made into lost models. The outer surface of the cluster is brushed with refractory paint, dried to make the refractory paint layer form a mold shell, and the defoaming liquid of Example 13 is added to the mold shell through the pouring riser, and the model disappears for about 30 minutes, defoaming and shrinking into a mixed liquid. The air is inflated to blow out the mixed liquid and recycled, and the mold shell with the pouring riser is vibrated to shape, and the molten metal liquid is poured into the mold shell through the pouring riser, and the casting is formed after solidification and cooling.

[0042] The mixed liquid is recovered by vacuum distillation, the casting quality is good, and there is no defect and the appearance of crystalline carbon.

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Abstract

The invention discloses a green lost foam casting method. The foam plastic is made into a lost model, combined and bonded with a pouring riser to make a lost model cluster, and the outer surface of the lost model cluster is brushed with refractory paint and dried. , make the refractory coating layer form the formwork, add defoaming liquid into the formwork through the pouring riser, make the disappearing model defoam and shrink into a mixed solution, take out the mixed solution and recycle it, and carry out the mold shell with the pouring riser Vibration molding, the molten metal is poured into the mold shell through the sprue riser, and the casting is formed after solidification and cooling. The invention avoids the problem of environmental pollution caused by the gasification and disappearance of the lost model in the traditional lost foam casting process, uses the defoaming liquid to defoam and shrink the lost model, and recycles it, so as not to discharge polluting gas, and recycles the defoaming liquid and Vanishing model; green energy saving and environmental protection, no carbon formation on the surface of the casting; no large amount of gas generated during the casting process, no pores in the casting, which significantly improves the quality of the casting.

Description

technical field [0001] The invention relates to a method for lost foam casting, which belongs to a green and environment-friendly method. Background technique [0002] Lost foam casting (also known as solid mold casting) is to make foam plastic into a foam model with the same size and shape as the casting and combine it into a module, then brush refractory paint and dry it, and then embed it in dry quartz sand for three-dimensional vibration modeling. , pouring molten metal under negative pressure to vaporize the module, the liquid metal occupies the position of the module, and forms a new casting method after solidification and cooling. [0003] Compared with traditional casting technology, lost foam casting technology has obvious advantages and is called "casting technology in the 21st century" and "green revolution of foundry industry". In the process of lost foam casting, high-temperature molten metal is used to vaporize and disappear the foam, but there are three major...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/04
Inventor 张敏卿张金利李文鹏
Owner TIANJIN UNIV
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