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Soluble salt element for high-pressure casting

A water-soluble salt and high-pressure casting technology, which is applied to casting molding equipment, cores, molds, etc., and can solve problems such as complex castings in the inner cavity

Inactive Publication Date: 2007-11-21
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In view of the above problems and considerations, the object of the present invention is to provide a water-soluble salt core for high-pressure casting, which has the characteristics of low price, high strength and good toughness, and solves the forming problem of castings with complex inner cavities

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0015] The preparation process of the salt core of the present invention includes mixing, melting, pouring, forming and other processes. First, mix the halide salt and the ceramic whiskers evenly and dry them in an oven for later use. The temperature of the oven is set at 130°C. Then put the dried mixture into a small graphite crucible in the electric furnace and melt it. After the salt is completely melted, start manual stirring with a stirring rod to fully mix the halide salt and whiskers. Control the temperature of the molten salt to exceed the melting point of the salt by about 50°C (that is, the degree of superheat is 50°C) and stop stirring, and directly pour the molten mixture into the standard sample metal mold at room temperature. Then solidified for about 10 seconds, it was quickly taken out and air-cooled, and finally the salt core was obtained.

[0016] As an example, without limitation, the metal halide salt used in the water-soluble salt core involved in the pre...

Embodiment 1

[0019] The mixture of 99 parts of NaCl and 1 part of aluminum borate whiskers is fully mixed, melted, poured into a metal mold at 850°C (superheated at 50°C), cooled and solidified, and the salt core can be obtained . The volume shrinkage of the salt core sample is about 11.60%, the bending strength reaches 3MPa, the collapse time is about 23min, and the moisture absorption rate is about 0.22%.

Embodiment 2

[0021] The mixture of 98 parts of NaCl and 2 parts of aluminum borate whiskers is fully mixed, melted, poured into a metal mold under the condition of 850°C (50°C superheat), cooled and solidified, and the salt core can be obtained . The volume shrinkage of the salt core sample is about 8.1%, the bending strength reaches 4.5MPa, the collapse time is about 30min, and the moisture absorption rate is about 0.12%.

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Abstract

The invention is concerned with water-solubility salt core for high-pressure molding made of metal halides and ceramic whisker. The quality ratio of metal halides and ceramic whisker is 90 to 99:1 to 10, and the optimization is 91 to 98:2 to 9. The water-solubility salt core for high-pressure molding (press molding, extrusion molding) bases on the light alloy hardware with complicated inner cavity with equal or over 17 Mpa bending strength and the collapsibility time is less then a hour, the contract ratio of bulk is less than 12.30 percent and the moisture absorption is less than 0.05 percent. The bending strength of salt core is high and the capability for high temperature and absorption of moisture is well with low contract ratio and low cost to press molding or extrusion molding of light alloy hardware with complicated inner cavity.

Description

technical field [0001] The invention belongs to the technical field of casting, and in particular relates to a water-soluble salt core for high-pressure casting (such as pressure casting and squeeze casting). technical background [0002] In order to expand the application of cores in high-pressure forming technology, it is necessary to develop cores that can withstand the impact of high-pressure liquid metal, and usually the cores need good collapse and heat resistance (in light alloy forming, the ability to withstand 600-700 ℃ high temperature). [0003] In high-pressure forming processes such as die casting, a water-soluble salt core is applied to the interior of the die-casting cavity, and liquid metal is injected into the interior of the mold where it solidifies. After that, put the casting into water to dissolve the salt core, or use high-pressure water to wash the salt core in the inner cavity of the casting. After the salt core is cleaned, the manufacturing process ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/00
Inventor 万里徐鹏程
Owner HUAZHONG UNIV OF SCI & TECH
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