STMMA large-size full mold casting plate evanescent mode and preparation method thereof

A technology of solid mold casting and lost foam, applied in casting and molding equipment and other directions, can solve the problems of casting quality decline, pouring back spray, not easy thermal decomposition, etc. Effect

Active Publication Date: 2018-01-09
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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  • STMMA large-size full mold casting plate evanescent mode and preparation method thereof
  • STMMA large-size full mold casting plate evanescent mode and preparation method thereof
  • STMMA large-size full mold casting plate evanescent mode and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0063] A method for preparing the lost foam of STMMA large-size solid casting plate, comprising the following steps:

[0064] (1) Selection of beads: select STMMA with a larger size between 0.7mm and 0.90mm as the original beads;

[0065] (2) Pre-foaming: add the above-mentioned STMMA beads to the SPJ1500 automatic intermittent pressurized quantitative pre-foaming machine for pre-foaming, the pressure of the feeding furnace is 0.013-0.018Mpa; the main steam pressure is 0.66-0.72Mpa, The steam adjustment pressure is 0.030-0.040Mpa, the temperature of the steam introduced is between 105-110°C, the pre-foaming temperature of STMMA is 105°C, because the glass transition temperature of STMMA is 100-105°C, the pre-foaming temperature Only when it reaches 105°C and above can STMMA complete pre-foaming. The steam enters the pre-foaming machine through the gas storage tank to accelerate the pre-foaming time of the steam, and is continuously stirred by the agitator in the pre-foaming r...

Embodiment 2

[0072] A method for preparing the lost foam of STMMA large-size solid casting plate, comprising the following steps:

[0073] (1) Selection of beads: select STMMA with a larger size between 0.7mm and 0.90mm as the original beads;

[0074] (2) Pre-foaming: add the above-mentioned STMMA beads 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 is 0.66-0.72Mpa, The steam regulating pressure is 0.030-0.040Mpa, and the temperature of the water steam is between 105-110°C. The steam enters the pre-foaming machine through the gas storage tank to accelerate the pre-foaming time of the steam, and is continuously stirred by the agitator in the pre-foaming room, so that the original STMMA 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 STMMA beads;

[0075] (3) Drying ...

Embodiment 3

[0081] A method for preparing the lost foam of STMMA large-size solid casting plate, comprising the following steps:

[0082] (1) Selection of beads: select STMMA with a larger size between 0.7mm and 0.90mm as the original beads;

[0083] (2) Pre-foaming: add the above-mentioned STMMA beads to the SPJ1500 automatic intermittent pressurized quantitative pre-foaming machine for pre-foaming, the pressure of the feeding furnace is 0.013-0.018Mpa; the main steam pressure is 0.66-0.72Mpa, The steam regulating pressure is 0.030-0.040Mpa, and the temperature of the water steam is between 105-110°C. The steam enters the pre-foaming machine through the gas storage tank to accelerate the pre-foaming time of the steam, and is continuously stirred by the agitator in the pre-foaming room, so that the original STMMA beads to be foamed are in a liquid state or the viscosity reaches a plastic state before foaming , the pre-expansion time is 150-165s per 28kg of STMMA beads; from the cross-sec...

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Abstract

The invention discloses an STMMA large-size full mold casting plate evanescent mode and a preparation method thereof. The method comprises the technique steps of bead selection, pre-foaming, drying curing, compression molding, cooling, demolding, plate drying and the like. The defects such as carbon black of the surfaces of nodular iron castings after casting can be overcome, gas evolution can beeffectively reduced, reverse ejection during casting is avoided, the shape of a manufactured and produced STMMA evanescent mode is prevented from being distorted, the bonding strength between beads isimproved, full combination of the beads is ensured, the structure strength of castings is improved, and the effects of saving raw materials, reducing cost and protecting environment are achieved, andthe yield of the castings is greatly increased; and the comprehensive production cost of the castings is further reduced.

Description

technical field [0001] The invention belongs to the field of casting technology, in particular to a large-size STMMA solid cast plate lost foam and a preparation method thereof, and is especially suitable for the preparation of STMMA lost foam patterns for ductile iron. 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, STMMA and STMMA-FD) that are easily vaporized at high temperatures as patterns, without sand cores, non-bonded dry sand, non-fitting boxes, It does not ta...

Claims

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Application Information

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IPC IPC(8): B22C7/02B22C7/04
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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