Method for preparing oxygen-rich full mold in pre-foaming stage based on lost foam mold

A pre-foaming and lost foam technology, used in manufacturing tools, casting equipment, metal processing equipment, etc., can solve the problem of decreased fluidity at the front end of casting filling, insufficient pyrolysis and gasification of foam patterns, liquid and solid residues To avoid the increase of liquid and solid residues, the cost is low, and the effect of compensating for endothermic cooling

Inactive Publication Date: 2017-10-24
ANHUI UNIVERSITY OF TECHNOLOGY AND SCIENCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the process of realizing the present invention, the inventors found that there are at least the following problems in the prior art: 1) The foam pattern prepared by various types of expandable resin beads, such as EPS (expandable polystyrene resin beads), EPMMA (expandable polymethyl methacrylate resin beads), STMMA (expandable methyl methacrylate and styrene copolymer resin beads), etc., all have carbon residues caused by high-temperature pyrolysis solid products to varying degrees. Surface defects such as black and slag inclusions
2) For the foam pattern prepared by various types of expandable resin beads, at high pouring temperature, the pyrolysis process needs to absorb a large amount of heat, causing the front-end metal liquid to cool down rapidly, resulting in a decrease in the fluidity of the front-end of casting filling, which is prone to cold Moreover, as the temperature of the front end of the molten metal drops, it is easy to cause insufficient pyrolysis and gasification of the foam pattern, and the increase of liquid and solid residues, together with the supercooled molten metal, forms the unique bean curd slag cold insulation phenomenon of lost foam casting

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A preparation method of an oxygen-enriched lost foam in the pre-expansion stage based on a foam white mold, including pre-expansion, drying and curing, and forming and foaming processes. The foam expands and infiltrates the external oxygen-enriched air into the foam cavity of the foam white mold beads. The pre-expansion machine used is an intermittent pre-expansion machine. First, the pre-expansion cylinder is preheated, and the preheating temperature is 80-90°C; After the preheating is completed, the EPS expandable original beads are quickly added to the pre-expansion cylinder, and then the oxygen-enriched steam with an oxygen volume content of not less than 21% is passed into the pre-expansion cylinder for pre-expansion, and the oxygen-enriched steam pressure is 0.1 ~0.2MPa, temperature is 90~105℃, the material is in a good boiling state during the pre-expansion process, the material level continues to rise until it reaches the height of the discharge material level, s...

Embodiment 2

[0026] The difference with Example 1 is that a kind of preparation method of the oxygen-enriched lost foam in the pre-foaming stage based on the foam white mold, the pre-expanding machine adopted is a continuous pre-expanding machine, specifically, first open the steam valve, pass Enter oxygen-enriched steam with an oxygen volume content of not less than 21% to preheat the pre-foaming cylinder. Enter the hopper, after the preheating is completed, open the gate of the feed inlet, and close the gate after all the raw materials enter the foaming machine. The raw material will gradually foam until the foaming particles flow out of the overflow port, open the raw material inlet to make it feed continuously, and at the same time the foaming particles flow out continuously from the overflow port, and enter the curing chamber for curing after being matured by the fluidized bed.

Embodiment 3

[0028] A method for preparing an oxygen-enriched lost foam in the pre-foaming stage based on a foam white mold. The foam structure material is STMMA, and the oxygen volume content in the gas in the foam cavity is 21%. In this embodiment, including pre-foaming , Drying and molding foaming process, in the oxygen-enriched atmosphere, in the pre-expansion stage, the oxygen-enriched steam is used for pre-expansion to expand and infiltrate the external oxygen-enriched air into the foam cavity of the foam white mold beads. The machine is an intermittent pre-expansion machine. First, preheat the pre-foaming cylinder, and the preheating temperature is 80-90°C; The oxygen-enriched steam with an oxygen volume content of not less than 21% is fed into the cylinder for pre-expansion. The pressure of the oxygen-enriched steam is 0.1-0.2 MPa, and the temperature is 90-105°C. During the pre-expansion process, the material is in a good boiling state. After rising continuously until reaching the...

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PUM

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Abstract

The invention discloses a preparation method of an oxygen-enriched lost foam in the pre-foaming stage based on a foam white mold. stage, using intermittent pre-expansion machine or continuous pre-expansion machine to expand and infiltrate external oxygen-enriched air into the foam cavity of foam white mold beads, so that the oxygen volume content in the gas of the foam cavity is not less than 21%. On the one hand, the present invention promotes the combustion and gasification of carbon atoms in the white mold, and reduces the residual solid products produced by foam pyrolysis; on the other hand, it promotes the oxygen-rich combustion of the white mold organic matter, and makes up for the heat absorption and cooling of the white mold pyrolysis process; and more Active oxygen atoms can promote the cracking degree and cracking speed of white mold.

Description

technical field [0001] The invention belongs to the technical field of lost foam casting, and in particular relates to a method for preparing an oxygen-enriched lost foam in a pre-foaming stage based on a foam white mold. Background technique [0002] Lost foam casting is an advanced technology with nearly no margin and precise molding. It conforms to the general trend of casting technology development and has broad development prospects. Its superiority is beyond doubt. In the lost foam process technology, the development of the pattern material and the pattern preparation process are particularly important: first of all, only the pattern material can have the lost foam (real) casting technology, and the development of the lost foam casting technology requires a pattern with better performance materials, and their preparation processes. [0003] At present, the raw materials used in the foam pattern used in lost foam casting are expandable resin beads. There are three main...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04B22C7/02
CPCB22C9/04B22C7/023
Inventor 陈志浩姚敏朱协彬尹博白明雪
Owner ANHUI UNIVERSITY OF TECHNOLOGY AND SCIENCE
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