Preparation method of FD evaporative pattern plate and evaporative pattern plate prepared by preparation method

A lost foam and plate technology, which is used in flat products, casting molding equipment, other household appliances, etc., can solve the problems of pouring and reverse injection, the quality of castings is reduced, and it is not easy to thermally decompose, so as to ensure full fusion, reduce gas generation, and improve The effect of bond strength

Inactive Publication Date: 2018-02-02
ANHUI UNIVERSITY OF TECHNOLOGY AND SCIENCE +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the advantages of low price, low gas generation, and easy forming of EPS, the pattern material used by most foundries is generally EPS to produce ductile iron castings, but this material has a relatively high carbon content (up to 92%). And the molecular formula contains a carbon-rich benzene ring structure, which is relatively stable in thermodynamics, so it is not easy to thermally decompose. When the temperature is higher than 900 ° C, EPS is thermally decomposed to form a tar-like viscous liquid, which is further decomposed into carbon and hydrogen. Cracking is carried out in

Method used

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  • Preparation method of FD evaporative pattern plate and evaporative pattern plate prepared by preparation method
  • Preparation method of FD evaporative pattern plate and evaporative pattern plate prepared by preparation method
  • Preparation method of FD evaporative pattern plate and evaporative pattern plate prepared by preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0058] A preparation method of FD disappearing template material, is characterized in that, comprises the following steps:

[0059] (1) Selection of beads: select FD with a particle size between 0.9mm as the original beads;

[0060] (2) Pre-foaming: Pressurized foaming is adopted, and the above-mentioned FD beads are added to the SPJ1500 automatic intermittent pressurized quantitative pre-foaming machine for pre-foaming. The pressure of the firing furnace is 0.013-0.018Mpa; the main steam pressure The steam pressure is 0.66~0.72Mpa, the steam adjustment pressure is 0.7~0.8Mpa, the temperature of the steam is 100°C, the steam enters the pre-foaming machine through the gas tank to accelerate the steam pre-foaming time, and is stirred in the pre-foaming chamber Stir continuously with the device, so that the FD primary beads to be foamed are in a liquid state or the viscosity reaches a plastic state before foaming. The pre-foaming time is 150-165s per 28kg of FD beads;

[0061] (...

Embodiment 2

[0069] A preparation method of FD disappearing template material, is characterized in that, comprises the following steps:

[0070] (1) Selection of beads: select FD with a particle size between 1.25mm as the original beads;

[0071] (2) Pre-foaming: Pressurized foaming is adopted, and the above-mentioned FD beads are added to the SPJ1500 automatic intermittent pressurized quantitative pre-foaming machine for pre-foaming. The pressure of the firing furnace is 0.013-0.018Mpa; the main steam pressure The steam pressure is 0.66~0.72Mpa, the steam adjustment pressure is 0.7~0.8Mpa, and the temperature of the steam is 100°C; the steam enters the pre-foaming machine through the gas storage tank to accelerate the steam pre-foaming time, and is stirred in the pre-foaming chamber Stir continuously with the device, so that the FD primary beads to be foamed are in a liquid state or the viscosity reaches a plastic state before foaming. The pre-foaming time is 150-165s per 28kg of FD beads...

Embodiment 3

[0080] A preparation method of FD disappearing template material, is characterized in that, comprises the following steps:

[0081] (1) Selection of beads: select FD with a particle size between 1.0mm as the original beads;

[0082] (2) Pre-foaming: Pressurized foaming is adopted, and the above-mentioned FD beads are added to the SPJ1500 automatic intermittent pressurized quantitative pre-foaming machine for pre-foaming. The pressure of the firing furnace is 0.013-0.018Mpa; the main steam pressure The steam pressure is 0.66~0.72Mpa, the steam adjustment pressure is 0.7~0.8Mpa, and the temperature of the steam is 100°C; the steam enters the pre-foaming machine through the gas storage tank to accelerate the steam pre-foaming time, and is stirred in the pre-foaming chamber Stir continuously with the machine, so that the FD original beads to be foamed are in a liquid state or the viscosity reaches a plastic state before foaming. The pre-foaming time is 150-165s per 28kg of FD bead...

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Abstract

The invention discloses a preparation method of a FD evaporative pattern plate and an evaporative pattern plate prepared by the preparation method. The preparation method comprises the processing steps of selecting of beads, pre-foaming, drying and curing, compression moulding forming, cooling, demoulding, plate drying and the like. According to the preparation method of the FD evaporative patternplate and the evaporative pattern plate prepared by the preparation method, the detects of carbon black on the surface of a nodular iron casting after the nodular iron casting is casted and the likecan be overcome, the gas forming amount can be effectively reduced and reverse spraying in the pouring process can be avoided, the appearance of a manufactured and produced FD evaporative pattern is prevented from deforming, the bonding strength of the beads is improved, sufficient integration of the beads is ensured, and the structural strength of the casting is improved; and the effects of saving raw materials, reducing the cost, and being environmentally friendly are achieved, the yield of castings is greatly increased, and the comprehensive production cost of the casting is further reduced.

Description

technical field [0001] The invention belongs to the technical field of casting, and in particular relates to a method for preparing an FD lost formwork material and the prepared lost formwork material, and is especially suitable for the preparation of a lost form solid plate material of gray iron parts. Background technique [0002] The lost foam casting technology is to bond and combine foamed plastic models similar in size and shape to the castings to form a model cluster. After brushing with a refractory coating and drying, it is buried in dry quartz sand for vibration molding, and liquid metal is poured under certain conditions. The method of vaporizing the model and occupying the position of the model, solidifying and cooling to form the required casting. Compared with traditional casting technology, lost foam casting uses foam materials (EPS, EPMMA, FD and FD-FD) that are easily vaporized at high temperatures as patterns, without sand cores, non-bonded dry sand, unsuit...

Claims

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Application Information

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IPC IPC(8): B29C69/02B29C71/02B29C44/60B29C43/58B29C43/52B29C37/00B22C7/02B22C7/04B29K25/00B29L7/00
CPCB29C69/02B22C7/023B22C7/04B29C37/0092B29C43/52B29C43/58B29C44/60B29C71/02B29C2043/5808B29C2043/5816B29K2025/08B29L2007/002B29L2031/757
Inventor 朱协彬徐达义赵军尹博陈志浩仲晓东刘平白明雪
Owner ANHUI UNIVERSITY OF TECHNOLOGY AND SCIENCE
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