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Preparation method of environment-friendly molding sand for casting

An environmentally friendly molding sand technology, which is applied to casting molding equipment, molds, cores, etc., can solve the problems of uneven condensation speed of castings, poor air permeability of sand molds, and easy cracks, etc., and achieve good thermal and chemical stability. Excellent bonding performance, not easy to crack and shrinkage cavity

Inactive Publication Date: 2018-08-03
FOSHAN GAOMING LIGANG PRECISION CASTING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the inventor has found in practice that the simple use of recycled CRT screen glass will cause local sudden expansion of the casting, thereby causing local condensation of the casting, which makes the condensation speed of the casting uneven, generates stress, and is prone to cracks and shrinkage cavities. The air permeability is not good, and the casting has pores

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A method for preparing environmentally friendly casting sand, which is prepared by uniformly mixing aggregates, binders, and water at a mass ratio of 106:7:6. The aggregates are composed of the following components in parts by weight: CRT screen 50 parts of glass treatment, 28 parts of graphite sand, 18 parts of zircon sand, 10 parts of turpentine rock powder.

[0033]Wherein the preparation method of the CRT screen glass treatment product comprises the following steps: use the recovered CRT equipment as raw material, use a glass cutting machine to separate the glass screen and the glass cone of the CRT from the screen cone seal, and remove the nails on the glass screen And the shadow mask plate, the glass screen is put into the jaw crusher for coarse crushing, and the coarsely broken glass block is put into the fine grinder for fine crushing. Here, the fine grinder can be a compound crusher or a hammer crusher. The finely crushed screen The glass passes through a vibra...

Embodiment 2

[0047] A method for preparing environmentally friendly casting sand, which is prepared by uniformly mixing aggregates, binders, and water at a mass ratio of 95:8:4. The aggregates are composed of the following components in parts by weight: CRT screen 45 parts of glass treatment, 25 parts of graphite sand, 16 parts of zircon sand, 9 parts of turpentine rock powder.

[0048] Wherein the preparation method of the CRT screen glass treatment product comprises the following steps: use the recovered CRT equipment as raw material, use a glass cutting machine to separate the glass screen and the glass cone of the CRT from the screen cone seal, and remove the nails on the glass screen And the shadow mask plate, the glass screen is put into the jaw crusher for coarse crushing, and the coarsely broken glass block is put into the fine grinder for fine crushing. Here, the fine grinder can be a compound crusher or a hammer crusher. The finely crushed screen The glass passes through a vibrat...

Embodiment 3

[0063] A method for preparing environmentally friendly casting sand, which is prepared by uniformly mixing aggregates, binders, and water at a mass ratio of 118:5:8, and the aggregates are composed of the following components in parts by weight: CRT screen 56 parts of glass treatment, 30 parts of graphite sand, 20 parts of zircon sand, 12 parts of turpentine rock powder.

[0064] Wherein the preparation method of the CRT screen glass treatment product comprises the following steps: use the recovered CRT equipment as raw material, use a glass cutting machine to separate the glass screen and the glass cone of the CRT from the screen cone seal, and remove the nails on the glass screen And the shadow mask plate, the glass screen is put into the jaw crusher for coarse crushing, and the coarsely broken glass block is put into the fine grinder for fine crushing. Here, the fine grinder can be a compound crusher or a hammer crusher. The finely crushed screen The glass passes through a ...

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Abstract

The invention discloses a preparation method of environment-friendly molding sand for casting. The molding sand is mainly prepared from aggregate and an adhesive which are uniformly mixed according tothe mass ratio of (95-118): (5-8). The aggregate is composed of the following components including, by weight, 45-56 parts of CRT screen glass treatment product, 25-30 parts of graphite sand, 16-20 parts of zircon sand and 9-12 parts of pitchstone powder, wherein the preparation method of the CRT screen glass treatment product includes the following steps that (1) recycled CRT screen glass is smashed till the grain diameter is 3 mm or below; (2) smashed CRT screen glass is continuously stirred for 5 minutes or above, and then granular screen glass is obtained; and (3) the granular screen glass is sieved. By means of the preparation method of the environment-friendly molding sand for casting, the obtained molding sand is high in mechanical strength, good in thermo-chemical stability, remarkable in adhesive property and good in breathability, the condensation speed of a cast part is uniform, the surface of the cast part after condensation is finished is not prone to cracking and formingshrinking holes, and the preparation method is particularly suitable for manufacturing cast parts which are high in quality requirement.

Description

technical field [0001] The invention relates to the technical field of casting, in particular to a preparation method of environmentally friendly casting sand. Background technique [0002] Casting is a method of making parts blanks in the machinery manufacturing industry. First, an outer mold (type) and an inner mold (core) are made of a certain material, and the cavity formed by the combination of the outer mold (type) and the inner mold (core) and The required target parts have the same shape and similar size, and then the metal of the selected material is melted into a liquid and poured into the cavity, and the required product-casting is produced after the molten metal is cooled and solidified. According to the different materials for making the cavity, there are casting processes such as sand casting, investment casting, metal casting, and lost foam casting. Among them, sand casting is a major casting process due to its low material cost and high productivity. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/00B22C1/16
CPCB22C1/00B22C1/167
Inventor 王立峰
Owner FOSHAN GAOMING LIGANG PRECISION CASTING CO LTD
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