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Lost foam casting process

A casting process and lost foam technology, applied in the field of lost foam, can solve the problems of poor high temperature crack resistance, poor concession, affecting the quality characteristics of casting parts, etc.

Pending Publication Date: 2019-04-02
HANZHONG YANHANG PRECISION MACHINERY MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Coatings not only affect the vaporization and gas migration of foamed plastics, but also are closely related to the surface quality, surface defects, casting precision and even the internal quality of castings. However, many existing coatings have high temperature resistance Poor cracking, poor yield and other problems, which in turn affect the quality characteristics of castings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A lost foam casting process, comprising the following steps:

[0026] (1) Pre-foam the polystyrene foam, then place it in the curing bin for 20 hours, fill it into the cavity of the metal mold, heat and expand to form a white foam mold, and place it at room temperature for 4 days , and then dry it at a temperature of 25°C until the humidity is less than 40%.

[0027] (2) After the foam plastic white mold is dried, a layer of water-based paint is coated on its surface, and dried until its surface is dry;

[0028] (3) Apply a layer of precision-optimized paint on the surface of the foam plastic white mold, and perform drying treatment at a drying temperature of 40°C to form a model cluster;

[0029] Wherein, the precision optimization paint is composed of the following components: 13 parts of modified filler, 10 parts of titanate coupling agent, 7 parts of polyglycerol, 15 parts of fatty alcohol polyoxyethylene ether, 23 parts of styrene-acrylic emulsion, ethyl acetate ...

Embodiment 2

[0033] A lost foam casting process, comprising the following steps:

[0034] (1) Pre-foam the polystyrene foam, then place it in the curing bin for 40 hours, fill it into the cavity of the metal mold, heat and expand to form a white foam mold, and place it at room temperature for 7 days , and then dry it at a temperature of 40°C until its humidity is less than 40%.

[0035] (2) After the foam plastic white mold is dried, a layer of water-based paint is coated on its surface, and dried until its surface is dry;

[0036] (3) Apply a layer of precision-optimized paint on the surface of the foam plastic white mold, and perform drying treatment at a drying temperature of 40-60°C to form a model cluster;

[0037] Wherein, the precision optimization coating is composed of the following components: 20 parts of modified filler, 15 parts of titanate coupling agent, 13 parts of polyglycerol, 30 parts of fatty alcohol polyoxyethylene ether, 40 parts of styrene-acrylic emulsion, ethyl ace...

Embodiment 3

[0042] A lost foam casting process, comprising the following steps:

[0043] (1) Pre-foam the polystyrene foam, then place it in the curing bin for 30 hours, fill it into the cavity of the metal mold, heat and expand to form a white foam mold, and place it at room temperature for 5 days , and then dry it at a temperature of 28°C until its humidity is less than 40%.

[0044] (2) After the foam plastic white mold is dried, a layer of water-based paint is coated on its surface, and dried until its surface is dry;

[0045] (3) Apply a layer of precision-optimized paint on the surface of the foam plastic white mold, and perform drying treatment at a drying temperature of 40-60°C to form a model cluster;

[0046] Wherein, the ingredients are weighed according to the following parts by mass: 18 parts of modified filler, 13 parts of titanate coupling agent, 12 parts of polyglycerol, 26 parts of fatty alcohol polyoxyethylene ether, 35 parts of styrene-acrylic emulsion, acetic acid 7 ...

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PUM

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Abstract

The invention belongs to the technical field of lost foam, and particularly discloses a lost foam casting process. The lost foam casting process comprises steps like foam plastic white mold manufacturing, model cluster forming and casting. In the manufacturing process of lost foam, the surface of a foam plastic white mold is coated with a layer of water-based coating, dried and then coated with alayer of precision optimization coating, so that modal clusters are not easy to crack and break in a high-temperature environment, the situation that molding sand flows out due to the fact that the model clusters are broken and cracked is avoided, and the problems that the surface of a casting is damaged and the precision is not high are solved. In addition, in the casting process of the casting,a layer of plastic film is covered on the surface of a sand box, the sand box is vacuumized, and then sand particles can be bonded together, so that the model clusters are firmer and not easy to damage. The lost foam is used for casting a mechanical device, the casting is subjected to one-time treatment, the obtained casting is accurate in precision, the casting process is simple, and the production cost is saved.

Description

technical field [0001] The invention belongs to the technical field of lost foam, and in particular relates to a casting process of lost foam. Background technique [0002] Lost foam casting is a full-type casting of foam plastic mold using dry sand without binder combined with vacuum technology. The main names in China are "dry sand solid mold casting" and "negative pressure solid mold casting", referred to as EPC casting. Lost foam casting is one of the most advanced casting processes in the world at present, and is known as a "revolution" in the history of casting. ", known as the 21st century green casting at home and abroad. Lost foam casting is a full-type casting of foam plastic molds using binder-free dry sand combined with vacuum technology. It combines foam models similar in size and shape to castings to form model clusters. After brushing and drying refractory coatings, they are buried in Vibration molding in dry quartz sand, pouring under negative pressure to v...

Claims

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Application Information

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IPC IPC(8): B22C9/04B22C7/02B22C3/00
CPCB22C3/00B22C7/023B22C9/04
Inventor 杨宝峰彭坤坤曹小康孙健
Owner HANZHONG YANHANG PRECISION MACHINERY MFG
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