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Preparation method for cleaning liquid for cleaning sand mold residue in investment casting

A technology of investment casting and residue, applied in the field of investment casting and precision casting, to achieve the effect of simple and easy access to raw and auxiliary materials, reduction of dust hazards, and convenient removal

Inactive Publication Date: 2018-10-19
ANHUI XIANGBANG COMPOSITE MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This cleaning solution can not only solve the problem of cleaning residual sand molds inside castings, but also reduce labor intensity and dust concentration, improve production efficiency and product quality, and there is no serious corrosion on the surface of general castings, especially aluminum castings. The surface of the casting is intact

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Add a certain concentration of 40% hydrofluoric acid and 37% hydrochloric acid (volume ratio 9:1) to 10 liters of 2.5 kg ammonia fluoride aqueous solution (containing 10% methanol). Keep the pH between 3 and 5, stir well, add 4% Tween 80 or 3% or TX10 / NP10 or 3% OP-10 or 3% AEO-9, and continue stirring until no oil is seen.

[0015] After standing for 2 to 4 hours, the corrosion inhibitor solution is heated to about 35°C, and then it can be used to soak the castings that have not been cleaned inside.

Embodiment 2

[0017] Add a certain concentration of 40% hydrofluoric acid and 40% fluoboric acid (volume ratio 2:1) to 10 liters of 2.5 kg of ammonia fluoride aqueous solution (containing 10% methanol), keep the pH between 3 and 5, and fully Stir, add 4% Tween 80 or 3% or TX10 / NP10 or 3% OP-10 or 3% AEO-9, continue stirring to form a homogeneous solution.

[0018] After standing for 2 to 4 hours, the corrosion inhibitor solution is heated to about 35°C, and then it can be used to soak the castings that have not been cleaned inside.

Embodiment 3

[0020] Add a certain concentration of 40% hydrofluoric acid and 40% fluoboric acid (volume ratio 2:1) to 10 liters of ammonia solution containing 4 kg of hydrogen fluoride. Keep the pH between 2 and 4, stir well, add 3% Tween 80 or 3% or TX10 / NP10 or 2% OP-10 or 2% AEO-9, continue stirring to form a uniform solution.

[0021] After standing still for 2 to 4 hours, the temperature of the corrosion inhibitor solution is raised to about 30°C, and then it can be used to soak the castings that have not been cleaned inside.

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PUM

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Abstract

The invention discloses a preparation method for cleaning liquid for cleaning sand mold residue in investment casting. The preparation method uses fluoride salt (ammonium fluoride, ammonium bifluoride) as raw material, uses pure water or pure water containing 10% methanol as solvent, and prepares the liquid by simply mixing. The preparation method uses a commonly used dispersant (OP-10, AEO-9, Tween 80, TX10 / NP10) and a pH regulator (hydrofluoric acid, mixed acid of hydrofluoric acid and fluoroboric acid or hydrochloric acid) that can mainly be recycled. The invention can not only reduce thelabor intensity but also reduce the dust hazard caused by mechanical cleaning. Through the method of the invention, cleaning the sand mold residue inside the casting can be simple, safe, convenient and without any erosion on the casting surface.

Description

technical field [0001] The invention relates to the field of investment casting in the field of precision casting, in particular to a preparation method for cleaning liquid for removing investment casting sand mold residues. Background technique [0002] Casting is one of the basic techniques of modern machinery manufacturing industry, so the development of the foundry industry marks the production strength of a country. my country has become one of the world's largest foundry countries and has made great achievements in the foundry industry. Investment casting, also known as lost wax casting, is a method of casting. Due to the high dimensional accuracy and surface finish of investment casting, it can cast complex castings of various alloys, especially superalloy castings. Therefore, it is widely used in military products and high-end equipment. Especially for complex-shaped, precise, high-melting-point alloy products that are difficult to form, investment casting has adv...

Claims

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Application Information

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IPC IPC(8): B22D31/00B22D29/00C23G1/04
Inventor 王磊刘预谢瑞山王鹏举
Owner ANHUI XIANGBANG COMPOSITE MATERIAL
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