Pickling process method of rotatable guide vane blade

Abstract

The invention provides a pickling process method for rotatable guide vane blades, which comprises the following steps: S1, performing oil removal process locking, and performing cleaning comparison on the same batch of blades at different times and different temperatures to completely remove oil stains on the surfaces of the blades; s2, acid process optimization is carried out, acid comparison at different times and different temperatures is carried out on the same batch of leaves, and an oil removal procedure and a neutralization procedure are fixed; s3, carrying out final determination on an alkali neutralization sample; and S4, the blade surface is subjected to compressed air cleaning and drying comparison in a drying furnace. By means of the method, the clean rotatable guide vane blade is obtained, meanwhile, cleaning of worker surface dust scraping is avoided, an ideal surface is provided for subsequent blade detection, the production efficiency is improved, damage to the blade surface caused by repeated acid pickling cleaning is avoided, and by means of the experiment, optimal acid pickling process parameters are found out; a large amount of unnecessary surface secondary cleaning and polishing are reduced, manpower is reduced, and experimental data are accumulated for the pickling process.

Description

Technical Field

[0001] The invention belongs to the field of pickling of rotatable blades, and in particular relates to a pickling process method for rotatable guide vane blades. Background Art

[0002] With the advancement of science and technology, gas turbines have been widely used in aerospace, military, oil and gas transportation, and power generation. However, according to the Norton cycle, the rear end parts of gas turbines need to work stably in a complex environment of high temperature, high oxidation and corrosion at 1000°C or above, which puts forward strong requirements for the preparation materials of the rear end parts. Nickel-based high-temperature alloys are considered to be ideal materials for the rear end parts of gas turbines because they can maintain stable fracture and creep properties when close to the melting point. Since the beginning of World War II, various military applications have put forward new requirements for nickel-based alloys, and the development of wax casting technology and vacuum melting technology has promoted the further development of nickel-based alloy production technology. A large number of alloy elements have been added to nickel-based alloys to improve the mechanical properties of the alloys, and four generations of nickel-based alloys have gradually developed. Among them, the guide vane is one of them, which is mainly used to adjust the gas flow and prevent the compressor from surging.

[0003] The earliest definition of the term pickling is the chemical treatment of using highly corrosive acids to remove metal contamination, welding and heat treatment scale. Today, the pickling process has become a very important part of manufacturing gas turbine blades. It mainly uses a visible method to observe the surface of the blades after acid cleaning, expose the defects on the blade surface, and inspect the blades at the lowest cost to avoid waste of personnel, equipment and time in subsequent processing. The pickling process mainly includes removing oil, scale and rust products on the metal surface to improve the surface quality of the blades and lay a good foundation for subsequent processing and assembly. However, many pickling manufacturers do not pay attention to the pickling process, and the process is not standardized. Often workers and technicians do not know which degree of pickling truly meets the pickling requirements and which degree is the best. Summary of the invention

[0004] The purpose of the present invention is to provide a pickling process method for convertible guide vanes to solve the problem that the surface of the pickled blades is not cleaned up and the subsequent grain size and fluorescence detection are affected.

[0005] A pickling process for a guide vane blade includes the following steps:

[0006] S1, first lock the degreasing process, and compare the cleaning of the same batch of blades at different times and temperatures to completely remove the oil stains on the blade surface;

[0007] S2, optimize the acid process, compare the acidity of the same batch of blades at different times and temperatures, and keep the degreasing process and neutralization process fixed;

[0008] S3, final determination of the alkali neutralization sample;

[0009] S4, comparison of blade surface cleaning with compressed air and drying in a drying oven.

[0010] Furthermore, in said S1, the tested transferable guide leaf is first placed in hot water at 20-80°C for chemical degreasing, a lipophilic cleaning agent is added, the cleaning time is 5-15 minutes, and then placed in warm water for cleaning for 1-5 minutes.

[0011] Furthermore, in S1, the process feasibility and production efficiency are combined to finally determine a cleaning process of 40°C / 5min, which is appropriately adjusted according to the oil stains and surface roughness of the blade surface.

[0012] Furthermore, in S1, the process feasibility and production efficiency are combined to finally determine a cleaning process of 40°C / 5min, which is appropriately adjusted according to the oil stains and surface roughness of the blade surface.

[0013] Furthermore, S2 is specifically as follows: drain the chemically deoiled blades again and put them into an acid solution for pickling, the pickling temperature is 20-80°C, the pickling time is 1-300 minutes, take them out again and quickly put them into hot water to remove the acid residue on the surface of the blades to prevent the acid from continuing to corrode the blade surface.

[0014] Furthermore, S3 specifically includes: placing the leaves after pickling and cleaning into an alkaline neutralizing solution for neutralization, the neutralization time is controlled within 1-5 minutes, and finally drying the leaves with compressed air.

[0015] The beneficial effects of the present invention are: the present invention obtains clean guide vane blades, while avoiding the workers' surface scraping and cleaning, providing an ideal surface for subsequent blade inspection, and further improving production efficiency, avoiding repeated pickling and cleaning to damage the blade surface. The present invention uses pickling solutions such as hydrochloric acid, sulfuric acid, copper sulfate and sodium carbonate to conduct pickling experiments at different times and temperatures, with the purpose of finding the optimal pickling process and guiding socialized large-scale production. Through this experiment, we not only find the optimal pickling process parameters, but also reduce a large amount of unnecessary secondary surface cleaning and grinding, and reduce manpower and accumulate experimental data for the pickling process. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a flow chart of the present invention. DETAILED DESCRIPTION

[0017] The present invention is further described below in conjunction with the accompanying drawings.

[0018] like Figure 1As shown, a pickling process method for a guide vane blade includes the following steps:

[0019] S1, first lock the degreasing process, and compare the cleaning of the same batch of blades at different times and temperatures to completely remove the oil stains on the blade surface;

[0020] First, the tested guide vanes were placed in hot water between 20-80℃ for chemical degreasing, and a lipophilic cleaning agent was added. The cleaning time was 5-15min, and then placed in warm water for cleaning for 1-5min. In combination with process feasibility and production efficiency, the cleaning process of 40℃ / 5min was finally determined, and it was adjusted appropriately according to the oil stains and surface roughness of the blade surface.

[0021] S2, optimize the acid process, compare the acidity of the same batch of blades at different times and temperatures, and keep the degreasing process and neutralization process fixed;

[0022] Drain the chemically degreased leaves again and put them into an acid solution for pickling at a temperature of 20-80°C for 1-300 minutes. Take them out again and quickly put them into hot water to remove the acid residue on the surface of the leaves to prevent the acid from continuing to corrode the surface of the leaves.

[0023] S3, final determination of the alkali neutralization sample, after the acid process is fixed, alkali neutralization experiments are carried out at different times, and the experiment is beneficial when the neutralization is completed and the minimum amount of alkaline pollution is introduced;

[0024] The leaves after pickling and cleaning are placed in an alkaline neutralizing solution for neutralization. The neutralization time is controlled within 1-5 minutes. Finally, the leaves are blown dry with compressed air.

[0025] S4, compares the compressed air cleaning of the blade surface with the drying in the drying furnace, which is beneficial in ensuring dryness, clean surface and improving production efficiency.

[0026] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A pickling process for guide vane blades, characterized in that: The following steps are involved: S1, first lock the degreasing process, and compare the cleaning of the same batch of blades at different times and temperatures to completely remove the oil stains on the blade surface; S2, optimize the acid process, compare the acidity of the same batch of blades at different times and temperatures, and keep the degreasing process and neutralization process fixed; S3, final determination of the alkali neutralization sample; S4, comparison of blade surface cleaning with compressed air and drying in a drying oven.

2. The pickling process of a guide vane according to claim 1, characterized in that: In the above S1, the tested transferable guide vanes are first placed in hot water at 20-80°C for chemical degreasing, a lipophilic cleaning agent is added, the cleaning time is 5-15 minutes, and then placed in warm water for cleaning for 1-5 minutes.

3. A pickling process for a guide vane according to claim 2, characterized in that: In S1, the process feasibility and production efficiency are combined to finally determine the cleaning process of 40°C / 5min, and the cleaning process is appropriately adjusted according to the oil stains and surface roughness of the blade surface.

4. The pickling process of a guide vane according to claim 1, characterized in that: The S2 is specifically as follows: draining the chemically deoiled blades again and placing them in an acid solution for pickling at a pickling temperature of 20-80°C for a pickling time of 1-300 minutes, taking them out again and quickly placing them in hot water to remove the acid residue on the blade surface to prevent the acid from continuing to corrode the blade surface.

5. The pickling process of a guide vane according to claim 1, characterized in that: The S3 is specifically as follows: putting the leaves after pickling and cleaning into an alkaline neutralizing solution for neutralization, wherein the neutralization time is controlled within 1-5 minutes, and finally the leaves are blown dry with compressed air.

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