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A foam pattern for preventing carbon defects in lost foam castings and its preparation method

A technology of carbon defects and lost foam, applied in the direction of casting molding equipment, etc., to achieve superior surface and strength properties, compact overall structure, and improve the quality of castings

Inactive Publication Date: 2016-04-20
郭雷辰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a foam mold that can prevent carbon defects in lost foam castings and its preparation method, so as to solve the problem of carbon defects such as carbon increase or carbon deposition in castings caused by lost foam gasification in lost foam casting technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1, the preparation and application of EPS foam mold pattern

[0023] (1) the original expandable polystyrene (EPS) beads with a particle size of 0.2mm and the particle size are 40 mesh potassium chlorate powders by mass and number ratio 2: 1 ball milling and mixing for 2 hours as pre-sent material;

[0024] (2) Pre-foam the above-mentioned pre-expanded material with SJ-Cx steam intermittent pre-expanded machine, the heating steam pressure is 0.20MPa, the foaming time is 40 seconds, and the pre-expanded temperature is 105°C; then use CH80 automatic hydraulic pressure The molding machine performs molding, the molding pressure is 0.07MPa, the molding time is 20 minutes, and the EPS foam shape is obtained;

[0025] (3) Evenly brush the magnesia paint on the outside of the above-mentioned obtained EPS foam pattern, and the thickness of the coating is 3mm; the coating is dried to ensure that the coating is fully dry and does not crack;

[0026] (4) Put the above-m...

Embodiment 2

[0028] Embodiment 2, the preparation and application of STMMA foam plastic pattern

[0029] (1) the original STMMA beads with a particle size of 1.6mm and the mixed powder with a particle size of 200 meshes of potassium permanganate and potassium chlorate in equal mass ratios were ball milled and mixed for 2 hours as pre-haired materials at a ratio of parts by mass of 3: 2;

[0030] (2) The pre-expanded material is pre-foamed with SJ-Cx steam intermittent pre-expansion machine, the heating steam pressure is 0.15MPa, the foaming time is 60 seconds, and the pre-expansion temperature is 100°C; then it is automatically hydraulically formed with CH80 molding machine, the molding pressure is 0.09MPa, and the molding time is 23 minutes to obtain the STMMA foam shape;

[0031] (3) Evenly brush the zircon powder coating on the outside of the STMMA foam plastic pattern obtained above, the coating thickness is 1mm, and the coating is dried to ensure that the coating is fully dry and does...

Embodiment 3

[0034] Embodiment 3, the preparation and application of EPMMA foam plastic pattern

[0035] (1) the original EPMMA beads with a particle size of 0.5mm and the particle size are 20 mesh potassium nitrate powders and are ball milled and mixed for 2 hours as pre-haired materials in a ratio of 1:5 by mass and number;

[0036] (2) The pre-expanded material is pre-foamed with SJ-Cx steam intermittent pre-expansion machine, the heating steam pressure is 0.01MPa, the foaming time is 20 seconds, and the pre-expansion temperature is 80°C; then it is automatically hydraulically formed with CH80 molding machine, the molding pressure is 0.01MPa, and the molding time is 5 minutes to obtain the EPMMA foam shape;

[0037] (3) Evenly brush the zircon powder coating on the outside of the EPMMA foam plastic pattern obtained above, and the thickness of the coating is 0.8mm, and the coating is dried to ensure that the coating is fully dry and does not crack;

[0038] (4) Put the above-mentioned E...

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PUM

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Abstract

The invention discloses a foam plastics mould preventing carbon defect of a lost foam casting and a preparation method thereof. The preparation method comprises the following steps: (1) foam bead grains and oxidation components are mixed to obtain a pre-foaming material; and the oxidation components are solid powdery materials with the oxygen balance larger than zero; and (2) the pre-foaming material is subject to the pre-foaming and the foaming moulding in sequence to obtain the foam plastics mould, and through the adoption of the method, the foam plastics mould is burnt fully to form a clean pouring cavity for preventing foam residues from being stuck on the inner wall of a coating layer; and (3) the carbon increment of the casting is reduced to 0.01 percent below, the integral texture of the casting is compact, the surface property and the strength property are superior, the carbon accumulation defect is avoided, the quality of the casting is greatly improved, and the finished product ratio is improved.

Description

technical field [0001] The invention relates to a foam plastic pattern for preventing carbon defects of lost foam castings and a preparation method thereof. Background technique [0002] Lost foam casting is a casting technique that uses poured high-temperature molten metal to decompose the shape of foamed plastics. Foamed plastic patterns are produced by foaming expandable plastic beads, buried in dry quartz sand, vibrated and shaped, and vacuumed to compact the dry sand covering the plastic pattern, and then poured with high-temperature liquid metal to decompose and gasify the pattern. The molten metal takes the place of the plastic pattern, cools and solidifies to form the desired casting. In recent years, lost foam casting technology has become one of the most widely used high-tech casting technologies at home and abroad. [0003] The carbon defect of the casting is a black inclusion defect, that is, carbon black, that appears on the side, top or inner section of the c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C7/02
Inventor 郭雷辰张晓蕊
Owner 郭雷辰
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