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A kind of rapid solidification water-soluble sand casting method

A sand casting, water-soluble technology, used in casting molding equipment, cores, molds, etc., can solve problems such as increasing the cost of sand casting, and achieve the effect of eliminating air thermal insulation, achieving rapid solidification, and good density.

Inactive Publication Date: 2019-07-12
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ordinary sand casting, such as coated sand, water glass sand and other casting processes, due to the problems caused by sand treatment and sand regeneration, increases the cost of sand casting and has many adverse effects on the environment

Method used

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  • A kind of rapid solidification water-soluble sand casting method
  • A kind of rapid solidification water-soluble sand casting method
  • A kind of rapid solidification water-soluble sand casting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A rapid solidification water-soluble sand casting method, the specific steps are as follows:

[0022] 1. Mix silica sand, sodium silicate, magnesium sulfate, and fly ash at a mass ratio of 1:0.025:0.005:0.005 to prepare sand molds and sand cores;

[0023] 2. It is cured by self-hardening method;

[0024] 3. Group type, group core, place ceramic tube sprue cup;

[0025] 3. After melting the cast aluminum alloy ZL114A, transfer it to the ladle and pour it at 700°C;

[0026] 4. Turn on the cooling water, and the erosion equipment moves from the far end of the sprue cup of the ceramic tube to the sprue cup of the ceramic tube at a speed of 2mm / s, so that the sand mold collapses and the rapid solidification of the casting is realized;

[0027] 5. Take out the casting;

[0028] 6. Collect the broken molding sand and dry it for reuse.

Embodiment 2

[0030] A rapid solidification water-soluble sand casting method, the specific steps are as follows:

[0031] 1. Mix silica sand, sodium silicate, magnesium sulfate, and fly ash at a mass ratio of 1:0.030:0.010:0.010 to prepare sand molds and sand cores;

[0032] 2. It is cured by self-hardening method;

[0033] 3. Group type, group core, place ceramic tube sprue cup;

[0034] 3. After smelting the deformed aluminum alloy 7075, transfer it to the ladle and pour it at 710°C;

[0035] 4. Turn on the cooling water, and the erosion equipment moves from the far end of the sprue cup of the ceramic tube to the sprue cup of the ceramic tube at a speed of 8mm / s, so that the sand mold collapses and the rapid solidification of the casting is realized;

[0036] 5. Take out the casting;

[0037] 6. Collect the broken molding sand and dry it for reuse.

Embodiment 3

[0039] A rapid solidification water-soluble sand casting method, the specific steps are as follows:

[0040] 1. Mix silica sand, sodium silicate, magnesium sulfate, and fly ash at a mass ratio of 1:0.035:0.015:0.015 to prepare sand molds and sand cores;

[0041] 2. It is cured by self-hardening method;

[0042] 3. Group type, group core, place ceramic tube sprue cup;

[0043] 3. After the magnesium alloy AZ91D is melted, it is transferred to the ladle and poured at 700°C;

[0044] 4. Turn on the cooling water, and the erosion equipment moves from the far end of the sprue cup of the ceramic tube to the sprue cup of the ceramic tube at a speed of 10mm / s, so that the sand mold collapses and the rapid solidification of the casting is realized;

[0045] 5. Take out the casting;

[0046] 6. Collect the broken molding sand and dry it for reuse.

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Abstract

The invention discloses a rapid solidification water-soluble sand mold casting method, which prepares a water-soluble sand mold and uses cooling water to erode immediately after pouring to obtain a relatively high cooling rate; and controls the direction and speed of eroding to make the casting Sequential solidification results in a dense, fine-grained casting. After the method is completed, along with the collapse of the water-soluble sand mold, the casting can be directly taken out, eliminating the sand cleaning process. Moreover, the molding sand after water erosion can be reused after being dried, which simplifies the process of sand treatment. The invention has the advantages of increasing the cooling rate, obtaining dense castings, fine grain structure, improving the mechanical properties of castings, and being environmentally friendly. The invention is suitable for casting aluminum alloys, deformed aluminum alloys, magnesium alloys, cast steel, and cast iron alloys. And the casting of large complex castings.

Description

technical field [0001] The invention relates to the field of metal solidification manufacturing, in particular to a rapid solidification water-soluble sand casting process. Background technique [0002] Sand casting has been widely used for a long time due to its advantages of strong applicability, low cost and easy availability of molding materials. However, due to the low thermal conductivity of the sand mold, the cooling rate of the casting is limited, resulting in a relatively coarse grain structure, which affects the performance of the casting. At the same time, common sand casting has problems such as difficulty in sand cleaning, poor working conditions for sand cleaning, and difficulty in sand recovery and regeneration. Sand treatment and sand recycling are one of the five major engineering departments of the foundry. The common problems of sand treatment are large amount of dust and waste discharge. Ordinary sand casting, such as coated sand, water glass sand and o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/02B22C1/18
CPCB22C1/188B22C9/02
Inventor 张守银徐志锋余欢
Owner NANCHANG HANGKONG UNIVERSITY
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