Green lost foam casting technology

A lost foam casting and process technology, applied in the direction of manufacturing tools, casting molding equipment, casting molds, etc., can solve problems such as gaps, and achieve the effect of expanding the scope, avoiding technical obstacles, and reducing carbon content

Inactive Publication Date: 2012-03-07
DALIAN JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is still a certain gap compared with developed countries in terms of technical level, raw and auxiliary materials, advanced nature of special equipment, and degree of automation.

Method used

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Embodiment Construction

[0022] Now in conjunction with accompanying drawing, the present invention is described in further detail:

[0023] Such as figure 1 The green lost foam casting process shown includes the following steps:

[0024] (1) Model making:

[0025] Usually there are two situations:

[0026] The first one is made of foam plastic beads, after pre-foaming-curing-foaming-molding-cooling;

[0027] Among them, regarding the selection of foam beads:

[0028] There are three types of foam beads for lost foam casting.

[0029] a. Expandable polystyrene resin beads (referred to as EPS);

[0030] b. Expandable methyl methacrylate and styrene copolymer resin beads (STMMA for short);

[0031] c. Expandable polymethyl methacrylate resin beads (EPMMA for short).

[0032] Expandable polystyrene resin beads (EPS) are commonly used for casting non-ferrous metals, gray iron and general cast steel.

[0033] Bead characteristics: translucent beads, pre-expansion ratio 40-60, particle size 0.18-0.8...

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Abstract

The invention relates to a novel green lost foam casting technology. The core is not to let a foaming mold be gasified and disappear during the casting process but to let it defoam for recovery, utilization and discharge of polluted gases so as to reach the purpose of green environmental protection. Without the gasification of the foaming mold, casting defects (such as pore defect) can be substantially eliminated, alloy carburetting can be avoided and the casting quality can be improved. After coating the foaming mold with paint, the surface of the foaming mold is coated with a binder and sand to produce a shell with a certain thickness. After the shell is completely hardened, the foaming mold is heated for defoaming, and casting is carried out in allusion to different shapes. By a corresponding method, the defoamed residual mold is taken out to complete the shell making. Finally, direct shell casting, sand burying (common dry sand, iron shot and the like), magnetic casting and vacuum casting the like are chosen according to the tension force of a casted molten metal. The technology is green and environmentally friendly with no pollution, can be used to substantially improve the quality of the lost foam casting, and can be widely applied in the industrial production.

Description

technical field [0001] The invention relates to a process method of lost foam casting. Background technique [0002] Lost foam casting, also known as solid casting, is usually made of foamed plastic (EPS, STMMA or EPMMA) polymer material to form a solid mold with exactly the same structure and size as the part to be cast, after dipping refractory coating (from Strengthening, cleansing, air permeability) and drying, buried in dry quartz sand for three-dimensional vibration modeling, pouring molten metal into the casting mold sand box under negative pressure, so that the polymer material model is heated and gasified and drawn out, and then A new casting method for producing castings by a new process of one-time molding casting formed after being replaced by liquid metal after cooling and solidification. [0003] Compared with traditional casting technology, lost foam casting technology has unparalleled advantages, and is called "the casting technology of the 21st century" and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04
Inventor 刘赵铭阎志明杨莉戴红
Owner DALIAN JIAOTONG UNIVERSITY
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