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Preparation method of molten steel filter screen for casting

A filter screen and molten steel technology, applied in the field of foundry materials, can solve the problems of reducing oxidation, reducing scour performance, reducing rigidity or refractoriness, etc., and achieving normal temperature strength and working temperature. performance effect

Active Publication Date: 2020-12-11
安徽省含山县威建铸造厂(普通合伙)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Phenolic resin is ablated under nitrogen atmosphere, which reduces oxidation and has a high residual rate. Therefore, it has higher ablation stability than oxygen, but it does not mean that phenolic resin can improve its stability after nitrogen treatment. It refers to The most important thing is its ablative environmental conditions, which are difficult to implement in casting filter applications
Chinese patent CN106390599B discloses a preparation method of molten steel filter screen for casting, which is the same as the traditional preparation method, the difference lies in the environmental protection process (high temperature degradation) under nitrogen atmosphere, so that the harmful gas is released in advance to reduce the time of filtering molten iron. The amount of harmful gas emitted, but the total amount of emitted gas has not been significantly reduced. In the actual process, due to high temperature degradation, the phenolic resin is decomposed in advance, the rigidity or refractoriness will be reduced, and the scouring performance will also be reduced. The continuous working time is also significantly reduced, which does not meet the conditions of industrial production, but actually reduces the performance of the molten iron filter. In addition, the improved test method for the gas generation does not meet the technical requirements of QJ-999-1986 molten iron filter. The method stipulated in the standard, and the improved gas generation, room temperature strength, etc. do not meet the requirements of the molten iron filter. Its rigidity, refractoriness and performance, the molten iron filter with good performance can even be used multiple times, reducing production costs. In the past 30 years, people have pursued better comprehensive performance of the casting filter to obtain better casting results. The requirements for the molten steel filter are higher, and those skilled in the art urgently need to develop a method for preparing the molten steel filter for casting to meet the existing application market and performance requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The first step is to prepare the dipping glue: at room temperature, in parts by weight, 60 parts of the slurry and 30 parts of an organic diluent composed of a mixture of acetone and propylene glycol monomethyl ether in a mass ratio of 1:1 are uniformly mixed to obtain the dipping glue Liquid; The composition of slurry is the mixture of benzoxazine cyanate, phenolic cyanate and benzoxazine, modified curing agent, and its mass ratio is benzoxazine cyanate: benzoxazine: Phenolic cyanate: modified curing agent=18:1:2:0.3;

[0018] In the second step, according to the distribution of the prepared filter screen with a thickness of 0.35mm, a mesh width of 1.5mm, and a length of 1.5mm, the high-temperature-resistant ceramic fiber is prepared into a warp beam through the SGE2319-7 warp knitting machine multi-strand filling yarn weaving process, The yarn has a linear density of 100tex, a twist of 300 twists / m, a drawing density of 8 courses / cm, a let-off ratio of 4, and a 10% gl...

Embodiment 2

[0020] The first step is to prepare the impregnation glue: at room temperature, in parts by weight, organic 25 parts of diluent are uniformly mixed to obtain stained glue; the composition of the slurry is a mixture of benzoxazine cyanate, phenolic cyanate, benzoxazine, and modified curing agent, and its mass ratio is benzoxazine Cyanate: benzoxazine: novolak type cyanate: modified curing agent=18:3:4:0.5;

[0021] In the second step, according to the distribution of the prepared filter screen with a thickness of 0.35mm, a mesh width of 1.5mm, and a length of 1.5mm, the high-temperature-resistant ceramic fiber is prepared into a warp beam through the SGE2319-7 warp knitting machine multi-strand filling yarn weaving process, The linear density of the yarn is 80tex, the twist is 250 twists / m, the drawing density is 8 courses / cm, the let-off ratio is 4, and the amount of glue is 5%, after soaking in acrylic resin softening solution, dry at 140°C for 4 minutes , the warp-knitted g...

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Abstract

The invention discloses a preparation method of a molten steel filter screen for casting, and belongs to the technical field of casting materials. The prepared molten steel filter screen is prepared from high-temperature-resistant ceramic fibers by warp knitting and impregnation in a glue solution, and has stronger impact resistance than a molten iron filter screen. The molten steel filter screenprepared with the preparation method disclosed by the invention can be used for effectively removing harmful impurities such as bubbles, ash inclusion oxides and various inclusions in metal melt and stabilizing the flow of the metal melt, so that air holes, slag holes and sand holes of castings are fundamentally eliminated as much as possible, the yield of the castings is greatly increased, and the quality of the castings is improved.

Description

technical field [0001] The invention relates to the technical field of casting materials, in particular to a method for preparing a molten steel filter screen for casting. Background technique [0002] In casting production, steel castings, iron castings and other alloy castings are prone to quality problems such as slag holes, sand holes, and gas holes due to various reasons. Therefore, removing non-metallic inclusions in the metal melt is beneficial to improving the casting yield. Improving the quality of castings has great technical and economic value. Compared with other types of filter screens, the high temperature resistant fiber casting filter screen is cheap, easy to use, does not change the metal composition of the casting, has good filter residue effect, and low gas generation. In addition, it also has high temperature resistance, ablation resistance, good chemical stability, resistance to metal melt erosion, and good strength. Therefore, the high temperature res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D43/00C04B35/66C04B35/14C04B35/622
CPCB22D43/004C04B35/62245C04B35/66C04B2235/3232C04B2235/3272C04B2235/96C04B2235/9676
Inventor 徐正平徐正东
Owner 安徽省含山县威建铸造厂(普通合伙)
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