Graphite mould casting method for precise forming of low expansion alloy

A low-expansion alloy, precision forming technology, used in casting and forming equipment, molds, cores, etc., can solve the problems of impossible implementation, limited application scope of alloys, serious hot cracking tendency, etc., and achieves strong graphite chilling effect. Effect

Active Publication Date: 2012-07-04
SHENYANG RES INST OF FOUNDRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above forming method can be realized for parts with simple structure, but it is almost impossible to implement for parts with complex three-dimensional structure
Therefore, the scope of application of the alloy is greatly limited
The casting method is used to form the alloy. Due to the high melting point of the alloy and the large free scale, the hot cracking tendency is very serious. There is no report on the precision forming of the alloy casting by casting method.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A graphite mold casting method for precision forming of low-expansion alloys. The alloy composition is 4J32 or 4J36 alloy. The outer dimension of the casting is 100×100×100mm, and the inner cavity size of the mold is 3% larger than the casting, which is 103×103 ×103 mm; the casting mold is processed with high-purity electrode graphite (purity = 99.5%), and the inner surface is coated with brushing method, the thickness of the coating is 0.25mm, and the coating production method is as follows: prepare fused alumina with a particle size of 325 mesh Powder (A) and fused yttrium oxide powder (B), and binder zirconium acetate (C), then add the three into the container according to the mass ratio of A:B:C=1.2:1.2:1 and mix evenly, and Stir for 3 hours at a speed of 300 rpm; after the coating is prepared, dry it for 6 hours at a temperature of 24°C and a humidity of 50%, and then use an alcohol blowtorch to pre-sinter the surface of the coating. Finally, put the mold into the ...

Embodiment 2

[0019] A kind of graphite mold casting method for precision forming of low-expansion alloy described in embodiment two is basically the same as embodiment one, and its difference is:

[0020] The cavity size of the casting mold is 1% larger than that of the casting. Fused alumina powder: fused yttrium oxide powder: binder zirconium acetate = 1:2.5:1. After the coating is prepared, the temperature is 20°C and the humidity is 50%. Let dry for 6 hours.

Embodiment 3

[0022] A kind of graphite mold casting method that is used for precision forming of low-expansion alloy described in embodiment three is basically the same as embodiment one, and its difference is:

[0023] The cavity size of the casting mold is 2.5% larger than that of the casting. Fused alumina powder: fused yttrium oxide powder: binder zirconium acetate=2.5:2.5:1. Let dry for 12 hours.

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Abstract

The invention provides a graphite mould casting method for precise forming of low expansion alloy. The method comprises the following steps: firstly preparing a part casting mould by using a graphite electrode, and adding 1-3% of shrinkage amount in a mould cavity of the casting mould; preparing a paint by using 325-mesh electric melting aluminum oxide powder, electric melting yttrium oxide powder and zirconium acetate at a mass ratio of (1-2.5):(1-2.5):1; then spraying the prepared paint on the surface of the mould cavity of the casting mould to form a coating with the thickness of 0.2-0.5mm, and shaping and pouring, wherein a 4J36 or 4J32 alloy ingot can be used as a consumable electrode for pouring; and finishing the pouring, thus obtaining the cast product. The method provided by the invention can be used for solving the problems that the 4J36 or 4J32 alloy has high melting point, the graphite chilling action is strong, the grains are coarse and the casting can generate hot crackseasily, and improving the quality and production efficiency of the 4J36 or 4J32 low expansion alloy casting.

Description

technical field [0001] The invention belongs to the field of casting, in particular to a graphite type casting technology for precision forming of low-expansion alloys. Background technique [0002] 4J36 alloy and 4J32 alloy are also known as Invar alloy and Super Invar alloy, which are precision alloys. Within a certain temperature range, their size changes little with temperature, and are widely used in optical instruments and other precision components. . Such as the pendulum of the standard clock, the balance wheel and the balance spring of the winning bid, the lead wire of the glass seal, the thermal bimetal for temperature control in the radio tube, the thermostat, the length scale, the geodetic baseline ruler, and the shadow mask steel of the color TV Belt, overhead transmission line core material, resonant cavity, laser collimator cavity, three-step repetitive lithography camera substrate, optical measurement system and waveguide structural parts, microscope, suppor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04
Inventor 刘时兵史昆刘宏宇马志毅谢华生赵军
Owner SHENYANG RES INST OF FOUNDRY
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