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Sodium silicate molding sand and sand casting method based on sand removal through water jet

A technology of sand casting and water glass, which is applied in the direction of casting molding equipment, casting molds, cores, etc. It can solve the problems of poor mold sand collapsibility, casting voids, and poor exhaust, so as to achieve good molding performance, improve casting performance, and harden short time effect

Active Publication Date: 2017-09-19
NEW MATERIAL INST OF SHANDONG ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to overcome the above-mentioned shortcomings and provide a water glass molding sand and a sand casting method based on water jet sand cleaning, which can solve the problems of poor sand collapsibility, poor exhaust, difficult recovery, and void defects in the casting.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A sand casting method based on water jet sand cleaning, comprising the steps of sand preparation-molding-core-making-box-closing-pouring, wherein the water glass sand is used in the preparation of the sand, and the water glass sand comprises the following raw material components in parts by weight: 94 parts of quartz sand, 5 parts of sodium silicate, 1 part of molding sand disintegrating agent, the weight percentage of molding sand disintegrating agent consists of: bentonite 50%, graphite 30%, starch 11%, dextrin 9%; after the pouring step is finished, When the pouring melt cools down to 650°C, spray water to the molding sand for rapid cooling, and the sprayed water will sequentially erode the collapsed sand mold at a pressure of 0.2MPa and a speed of 8mm / s, rapidly solidify the melt, and discharge gas in a direction to improve the performance of the casting . The tensile strength of A356 aluminum alloy formed by this method reaches 316MPa.

Embodiment 2

[0026] A sand casting method based on water jet sand cleaning, comprising the steps of sand preparation-molding-core-making-box-closing-pouring, wherein the water glass sand is used in the preparation of the sand, and the water glass sand comprises the following raw material components in parts by weight: 93 parts of quartz sand, 5.5 parts of sodium silicate, 1.5 parts of molding sand disintegrating agent, the weight percentage of molding sand disintegrating agent consists of: bentonite 51%, graphite 28%, starch 11%, dextrin 10%; after the pouring step is finished, When the pouring melt cools down to 680°C, spray water to the molding sand for rapid cooling, and the sprayed water will sequentially erode the collapsed sand mold at a pressure of 0.3MPa and a speed of 6mm / s, rapidly solidify the melt, and discharge gas in a direction to improve the performance of the casting . The tensile strength of the A356 aluminum alloy formed by this method reaches 324MPa.

Embodiment 3

[0028] A sand casting method based on water jet sand cleaning, comprising the steps of sand preparation-molding-core-making-box-closing-pouring, wherein the water glass sand is used in the preparation of the sand, and the water glass sand comprises the following raw material components in parts by weight: 93 parts of quartz sand, 5.5 parts of sodium silicate, 1.5 parts of molding sand disintegrating agent, the weight percentage of molding sand disintegrating agent consists of: bentonite 51%, graphite 28%, starch 11%, dextrin 10%; after the pouring step is finished, When the pouring melt cools down to 680°C, spray water to the molding sand for rapid cooling, and the sprayed water will sequentially erode the collapsed sand mold at a pressure of 0.4MPa and a speed of 4mm / s, rapidly solidify the melt, and discharge gas in a direction to improve the performance of the casting . The tensile strength of the A356 aluminum alloy formed by this method reaches 338MPa.

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Abstract

The invention relates to sodium silicate molding sand and a sand casting method based on sand removal through a water jet. The casting method comprises steps of molding sand preparation, molding, core making, mold assembling and pouring. The sodium silicate molding sand used during molding sand preparation is prepared from raw material components in parts by weight as follows: 92-96 parts of quartz sand, 3-6 parts of sodium silicate and 1-2 parts of a molding sand breakdown agent. The molding sand breakdown agent is prepared from raw materials as follows: bentonite, graphite, starch and dextrin. After the pouring step is completed, water is jetted to the molding sand for quick cooling when the temperature of poured melt is reduced to be in the range of 650 DEG C-700 DEG C. The sodium silicate molding sand has the good collapsibility, the purposes of grain refinement and directional exhaust can be achieved through water jetting and quick cooling, and the performance of a casting is improved; loose sand after collapsing can be recycled, the cost is low, and the sand is pollution-free, clean and environment-friendly.

Description

technical field [0001] The invention relates to a sand casting method, in particular to a sand casting method based on water jet sand cleaning and water glass molding sand used, and belongs to the technical field of molding sand casting and molding sand improvement. Background technique [0002] Sodium silicate molding sand has the characteristics of high strength, low cost, easy operation, non-toxic and environmental protection, and has been widely valued by foundry workers in recent years. With the further development of the glass sand casting process, although many modifiers, disintegrating agents, and exhaust agents have been put into production and application one after another, the disintegration and exhaust properties have been improved accordingly, but the strength of the molding sand will decrease, and the sand sticking of the castings will occur. , Inconvenient sand cleaning and difficulty in reusing old sand lead to unstable quality of casting products. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/02B22C9/02
CPCB22C1/02B22C9/02
Inventor 修大鹏张素卿周吉学李卫红韩青友杨院生
Owner NEW MATERIAL INST OF SHANDONG ACADEMY OF SCI
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