High temperature alloy chemical milling fluid and using method thereof

A chemical milling and superalloy technology, applied in the field of superalloy chemical milling fluid, can solve the problems affecting the quality and efficiency of chemical milling, and achieve the effect of small surface roughness, improved machining efficiency and good flatness.

Inactive Publication Date: 2018-02-23
CHINA HANGFA GUIZHOU LIYANG AVIATION POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Analyzing the above technologies, it can be seen that the formulation of the chemical milling fluid is the key to the quality and efficiency of the entire chemical milling process. For example, the processing rate of the chemical milling fluid used in patent CN103451656 A can only reach 2.4-4.4 μm / min

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Embodiment 1: the material of the part to be processed is GH4169 superalloy, at first the part is immersed in a kind of superalloy chemical milling fluid of the present invention, and composition and content are: the concentrated nitric acid 100ml / L of mass fraction 65%, mass fraction 98 % Concentrated sulfuric acid 100ml / L, ferric sulfate 100g / L, hexamethylenetetramine 2g / L, the balance is water, keep the temperature of the chemical milling fluid at 40°C, and make the parts in the chemical milling fluid at a speed of 5r / min Rotate in the middle, and stir the chemical milling fluid at the same time, the stirring speed is 160r / min, take out the parts after 5min, and carry out the post-processing process. Finally, the quality difference of parts before and after chemical milling was measured, and the rate of chemical milling in Example 1 was calculated to be 14 μm / min, and the machined surface had small roughness, good flatness, and no defects such as over-corrosion and st...

Embodiment 2

[0010] Embodiment 2: the part material to be processed is GH4169 superalloy, at first the part is immersed in the preparation concentrated nitric acid volume fraction is 30%, the concentrated sulfuric acid volume fraction is 10%, ferric sulfate is 150g / L, hexamethylenetetramine is 5g / L L chemical milling fluid, keep the temperature of the chemical milling fluid at 45°C, and make the parts rotate in the chemical milling fluid at a speed of 15r / min, while stirring the chemical milling fluid at a stirring speed of 180r / min, take out the parts after 5min, and carry out Processing procedure. Finally, the quality difference of parts before and after chemical milling was measured, and the rate of chemical milling in Example 1 was calculated to be 23 μm / min, and the processed surface had small roughness, good flatness, and no defects such as over-corrosion and streamline pits.

Embodiment 3

[0011] Embodiment 3: the part material GH4169 superalloy to be processed, at first part is immersed in the concentrated nitric acid volume fraction that is 30%, the concentrated sulfuric acid volume fraction is 20%, ferric sulfate is 200g / L, hexamethylenetetramine is 10g / L In the chemical milling fluid, keep the temperature of the chemical milling fluid at 45°C, and make the parts rotate in the chemical milling fluid at a speed of 15r / min, while stirring the chemical milling fluid at a stirring speed of 180r / min, take out the parts after 5min, and perform post-processing process. Finally, the quality difference of parts before and after chemical milling was measured, and the rate of chemical milling in Example 1 was calculated to be 31 μm / min, and the machined surface had small roughness, good flatness, and no defects such as over-corrosion and streamline pits.

[0012] Embodiment 3: the material of the parts to be processed is GH4169 superalloy, first the parts are immersed i...

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Abstract

The invention relates to the field of thermal machining, in particular to a machining method of chemical milling of a high temperature alloy. The machining method is characterized in that, the components and contents of high temperature alloy chemical milling fluid comprise, by mass, 65% of concentrated nitric acid with the concentration being 100-500 ml/L, 98% of concentrated sulfuric acid with the concentration being 100-300 ml/L, ferric sulfate with the concentration being 100-300 g/L, hexamethylene tetramine with the concentration being 2-20 g/L and the balance water. By adopting the method, chemical milling can be rapidly and stably conducted on a high temperature alloy part, and it is ensured that the machined surface of the high temperature alloy part is bright and clean, and the defects of over etching, filament line pits and the like do not exist.

Description

technical field [0001] The invention relates to the field of thermal processing, in particular to a high-temperature alloy chemical milling fluid and a method for using the same. Background technique [0002] Superalloys are widely used in the field of aero-engines due to their good high-temperature strength, superior oxidation resistance, and gas corrosion resistance, such as compressor blades, turbine blades, guide vanes, and combustion chambers. However, superalloys have low plasticity and high hardness. During machining, the tool wears seriously and has a short service life. For parts with complex shapes, each tool can only process three to four parts on average. With the rapid development of the aviation industry, the demand for high-temperature alloy parts is increasing year by year, and there is an urgent need for a production method that can quickly and stably remove the surplus of high-temperature alloy parts. Chemical milling is a good processing method. [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/04C23F1/16
CPCC23F1/04C23F1/16
Inventor 刘垚臣林长鹏赵松胡吉云
Owner CHINA HANGFA GUIZHOU LIYANG AVIATION POWER CO LTD
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