CN115418639A - Chemical milling solution and method for stainless steel - Google Patents
Chemical milling solution and method for stainless steel Download PDFInfo
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- CN115418639A CN115418639A CN202211202932.5A CN202211202932A CN115418639A CN 115418639 A CN115418639 A CN 115418639A CN 202211202932 A CN202211202932 A CN 202211202932A CN 115418639 A CN115418639 A CN 115418639A
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/02—Local etching
- C23F1/04—Chemical milling
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/10—Etching compositions
- C23F1/14—Aqueous compositions
- C23F1/16—Acidic compositions
- C23F1/28—Acidic compositions for etching iron group metals
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Abstract
The invention discloses a chemical milling solution and a chemical milling method for stainless steel, wherein the chemical milling solution comprises the following components: hydrofluoric acid: 130-150 g/L; hydrochloric acid: 30-50 g/L; nitric acid: 200-25) g/L; the chemical milling method comprises the following steps: s1: measuring initial data of a workpiece to be processed; s2: preparing a chemical milling solution, and then putting a workpiece to be processed into the chemical milling solution for chemical milling; s3: and (4) checking the workpiece after chemical milling, comparing the workpiece with a standard workpiece to determine whether the workpiece meets the removal amount requirement, and repeating the chemical milling if the workpiece does not meet the removal amount requirement. The solution ensures that the removal amount is consistent when the stainless steel blade is chemically milled, avoids complex allowance removal work after the finish forging is finished, has simple and easily controllable method in the whole chemical milling process, ensures the requirements of uniform removal amount and surface finish of the stainless steel blade, reduces the processing cost and improves the production efficiency.
Description
Technical Field
The invention relates to the field of stainless steel tempering and milling, in particular to a stainless steel tempering and milling solution and a method.
Background
In an aircraft engine, a blade plays a key role in energy conversion, and is one of key parts of the engine, and the blade determines the efficiency, quality, cost, performance and the like of subsequent machining. The blade is usually subjected to a precision forging process in the machining process, and the precision forging process of the blade can effectively shorten the machining period, save materials, reduce the production cost and improve the product quality.
However, the thickness of each forged blade is different due to the influence of the blade structure, deformation at different positions, inconsistent metal flow, energy fluctuation of equipment in the forging process and the like in the forging process of the stainless steel blade, and the thickness of each part of each blade is inconsistent with that of the theoretical standard blade, so that the uniform size removal and the surface finish of the stainless steel blade cannot meet the requirements.
The chemical milling is to replace mechanical processing or polishing by a chemical milling method so as to remove redundant metal layers and pollution layers on the surface of the blade after final forging to reach the size of the final design requirement, and is one of important processes in the production process of the stainless steel precision forging blade. In the whole precision forging process, the sizing and milling of the blade is a crucial link, and the success or failure of the precision forging process is determined. Stainless steel is a common material for aviation engine blades, and the chemical milling method is also particularly important.
However, in the workpiece obtained by the chemical milling method in the prior art, the amount of the material under the substrate is not uniform, and the surface waviness phenomenon still occurs.
Disclosure of Invention
Aiming at the problems of non-uniform chemical milling result and non-ideal chemical milling effect caused by surface ripple marks in the prior art, the invention provides a chemical milling solution and a chemical milling method for stainless steel; the method has the advantages that the removal amount is consistent during the chemical milling of the stainless steel blades, the complex allowance removal work after the finish forging is finished is avoided, the method is simple and easy to control in the whole chemical milling process, the requirements on uniform removal amount and surface finish of the stainless steel blades are met, the processing cost is reduced, and the production efficiency is improved.
The invention is realized by the following technical scheme:
a chemical milling solution for stainless steel, which comprises a solution,
the chemical milling solution comprises: hydrofluoric acid: 130-150 g/L; hydrochloric acid: 30-50 g/L; nitric acid: 200-25) g/L;
further, a chemical milling method based on the stainless steel chemical milling solution is provided, and the chemical milling method comprises the following steps:
s1: measuring initial data of a workpiece to be processed;
s2: preparing a chemical milling solution, and then placing a workpiece to be processed into the chemical milling solution for chemical milling;
s3: and (4) checking the workpiece after chemical milling, comparing with the standard workpiece to determine whether the removal quantity requirement is met, and repeating the chemical milling if the removal quantity requirement is not met.
Further, when measuring the initial data of the workpiece to be processed, the thickness of the cross section of the workpiece to be processed is measured first, and the thickness of the cross section of the workpiece to be processed is compared with the thickness of the cross section of the standard workpiece.
Further, chemical milling pretreatment is required before chemical milling, and the chemical milling pretreatment comprises the following steps:
s2.1: putting a workpiece to be processed into a chemical milling solution, carrying out chemical milling for a minutes,
s2.2: taking out the workpiece which is chemically milled for a minutes, and measuring the thickness of the workpiece which is chemically milled for a minutes;
s2.3: and calculating the chemical milling speed according to the section thickness of the workpiece to be processed and the a minute thickness of the workpiece after chemical milling, and calculating the time required for milling the blade to the section thickness of the standard workpiece.
Further, before chemical milling, preprocessing is carried out, and the preprocessing comprises the following steps:
degreasing the workpiece to be processed by using a degreasing agent;
and carrying out secondary cleaning on the workpiece to be processed after oil removal.
Further, post-processing is carried out after the chemical milling, and the post-processing comprises the following steps:
firstly, cleaning for one time after chemical milling is finished;
removing hanging ash on the workpiece after the primary cleaning is finished;
after the ash removal is finished, putting the mixture into a neutralization tank for neutralization;
after neutralization, carrying out secondary cleaning;
and drying the workpiece subjected to the secondary cleaning.
Further, the secondary cleaning comprises: cold water rinsing and hot water rinsing.
Further, the oil removal agent is used for removing oil, and the oil removal agent comprises sodium hydroxide with the concentration of (55-75) g/L; (35-45) g/L sodium carbonate; (7-10) g/L of water glass and water.
Further, in post-treatment after chemical milling, ash removal and ash removal are carried out by using ash removal tank liquor, wherein the ash removal and ash removal tank comprises nitric acid and water with the concentration of 380-410 g/L.
Further, a neutralization tank solution is arranged in the neutralization tank, and the neutralization tank solution comprises sodium carbonate with the concentration of (55-70) g/L and water.
Compared with the prior art, the invention has the following beneficial technical effects:
the chemical milling solution and the chemical milling method of the solution provided by the invention can ensure that the removal amount is consistent when the stainless steel blade is subjected to chemical milling, can effectively avoid complex allowance removal work after finish forging is finished by the operation of the method, can control the removal amount in a detection mode in the whole chemical milling process, further ensures the chemical milling effect by calculating the chemical milling time, ensures the requirements of uniform removal and surface smoothness of the stainless steel blade, reduces the processing cost and improves the production efficiency.
Furthermore, the chemical milling method provided by the invention can effectively reduce the labor intensity, thereby improving the labor production efficiency and reducing the production cost, and can avoid surface stress, deformation, polishing burn and the like caused by machining.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the embodiments or technical descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flow chart of a chemical milling method for stainless steel according to an embodiment of the present invention.
Detailed Description
In the following, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Example 1:
the embodiment of the invention provides a stainless steel chemical milling method, and the martensitic stainless steel precision-forged blade is tested in the embodiment, so that the removal amount of the stainless steel blade during chemical milling can be effectively ensured to be consistent, the complex allowance removal work after finish forging is avoided, the method is simple and easy to control in the whole chemical milling process, the requirements of uniform removal amount and surface finish degree of the stainless steel blade are met, the processing cost is reduced, and the production efficiency is improved.
The method is realized by the following steps:
1) Measurement: preparing a forged stainless steel blade, selecting three sections detected on the stainless steel blade according to design requirements, and measuring the thickness of three point positions on each section by an inductance measuring instrument.
2) Grouping: the thickness of each measurement point is compared with the standard blade thickness, and the thickness deviation T is divided into 0.05mm, namely: 0.05 group when T is more than or equal to 0.05 and less than 0.1, 0.10 group when T is more than or equal to 0.1 and less than 0.15, 0.15 group when T is more than or equal to 0.15, 823060, 8230, and so on.
3) Preparing a liquid: preparing a chemical milling agent in the chemical milling groove, wherein the concentration of the chemical milling agent is as follows: hydrofluoric acid: (130-150) g/L; hydrochloric acid: (30-50) g/L; nitric acid: (200-250) g/L; the balance of water;
preparing a degreasing agent in the degreasing tank, wherein the concentration of the degreasing agent is as follows: sodium hydroxide: (55-75) g/L; sodium carbonate: (35-45) g/L; water glass (7-10) g/L; the balance of water;
preparing a solution in the ash removal tank, wherein the concentration of the solution is as follows: nitric acid: (380-410) g/L; the balance of water;
preparing a neutralization tank solution in the neutralization tank, wherein the concentration of the neutralization tank solution is as follows: sodium carbonate: (55-70) g/L; the balance of water.
4) Measuring speed: during chemical milling, the thickest group of blades is taken to measure the thickness (at least 3 pieces) by an inductance gauge, and the thickness variation of the blades is measured after chemical milling (2-5) minutes.
5) Loading blades: (1) the loading quantity is as follows: the length is less than or equal to 80, and the number is less than or equal to 400; the length is more than 80 and less than or equal to 100, and the number is less than or equal to 300; the length is more than or equal to 100, and the number is less than or equal to 150. The loading number of the blades with complicated shapes or heavy weight is adjusted according to the actual situation; according to the size of the blade, the blade is assembled into a plastic roller.
(2) By calculating the milling time required to determine the set of blades and setting the milling time parameter, the thickness is reduced by 0.05mm to prevent over-milling. Milling time = (blade milling amount-0.05)/milling speed of double faces.
6) Oil removal: placing the blades loaded in the step 5) in an oil removing tank for removing oil (the rotating speed of a roller is 10 revolutions per minute), and keeping the blades for 5 to 8 minutes under the condition of stirring compressed air at the temperature of between 70 and 100 ℃.
7) Cleaning: placing the group of blades which have been subjected to oil removal in the step 6) in a hot water tank for washing (the rotating speed of a roller is 10 revolutions per minute), and keeping the blades for (0.5-1) minutes under the condition of stirring by compressed air at the temperature of (70-100 ℃); then, cold water washing is carried out (the rotating speed of the roller is 10 revolutions per minute) for 0.5 to 1 minute at room temperature.
8) Chemical milling: placing the group of blades cleaned in the step 7) in a chemical milling groove for chemical milling (the rotating speed of a roller is 10 revolutions per minute), keeping the temperature at 45-75 ℃ under the condition of stirring compressed air, and preferably controlling the chemical milling speed at 0.05-0.10 mm per double surface.
9) Cleaning: placing a group of blades chemically milled in the step 8) in a cold water tank for washing (the rotating speed of a roller is 10 revolutions per minute), and keeping the blades for 1-2 minutes under the condition of stirring by compressed air at room temperature.
10 Removing hanging ash: placing the group of the blades cleaned in the step 9) in an ash removal groove for removing and hanging ash (the rotating speed of a roller is 10 revolutions per minute), keeping the blades for 1-2 minutes under the stirring state of compressed air, and keeping the blades at room temperature.
11 Neutralization: placing the group of the blades cleaned in the step 9) in a neutralization tank for neutralization (the rotating speed of a roller is 10 revolutions per minute), keeping the blades for 1-2 minutes in a state of stirring by compressed air, and keeping the temperature at room temperature.
12 Cleaning: placing the group of the blades neutralized in the step 10) in a cold water tank for washing (the rotating speed of a roller is 10 revolutions per minute), and keeping the blades for 1-2 minutes under the condition of stirring by compressed air at room temperature.
13 Unloading the blade): and (4) opening a door of the roller after the roller is washed by a water gun, immediately washing floating ash on the surface of the blade, and then washing the floating ash by a high-pressure water gun of a washing groove.
14 Cleaning: and (3) placing the taken blades in a hot water tank for washing for 1-2 minutes at the temperature of 70-100 ℃.
15 Drying: the compressed air switch of the drying device is opened, and the blade is dried by hot compressed air.
16 Size checking: the thickness dimension of the blade is measured with an electrical gauge.
17 Repeat chemical milling: and (5) repeating the step 5) to the step 16), performing oil removal, chemical milling, ash removal, neutralization and corresponding cleaning on the part again, finally drying, and performing size inspection until the size after chemical milling meets the removal amount required by the blade. And carrying out chemical milling on the blades of other groups according to the steps.
18 Test) of: the appearance and dimensions are determined.
Example 2:
a chemical milling method for stainless steel precision-forged blades comprises the following steps:
1) Measurement: preparing a forged stainless steel blade, selecting three sections required to be detected on the blade, and measuring the thicknesses of three K point positions on each section by an inductance measuring instrument;
2) Grouping: comparing the thickness of each measuring point with the thickness of a standard blade, and grouping the thickness deviation T of 0.05mm, namely: 0.05 group when T is more than or equal to 0.05 and less than 0.1, 0.10 group when T is more than or equal to 0.1 and less than 0.15, 0.15 group when T is more than or equal to 0.15, 823060, 8230, and so on.
3) Preparing liquid: preparing a chemical milling agent in the chemical milling groove, wherein the concentration of the chemical milling agent is as follows: hydrofluoric acid: 150g/L; hydrochloric acid: 30g/L; nitric acid: 205g/L; the balance of water.
Preparing a degreasing agent in the degreasing tank, wherein the concentration of the degreasing agent is as follows: sodium hydroxide: 55g/L; sodium carbonate: 35g/L; 7g/L of water glass; the balance of water;
preparing a solution of the ash removal tank in the ash removal tank, wherein the concentration of the solution is as follows: nitric acid: 510g/L; the balance of water;
preparing a neutralization tank solution in the neutralization tank, wherein the concentration of the neutralization tank solution is as follows: sodium carbonate: 70g/L; the balance of water.
4) Measuring speed: and (3) measuring the thickness of the thickest group of blades (at least 3 pieces) by using an inductance gauge during chemical milling every time, and measuring the thickness variation of the blades after 5 minutes of chemical milling.
5) Loading blades: (1) loading quantity: the length is less than or equal to 80, and the number is less than or equal to 400; the length is more than 80 and less than or equal to 100, and the number is less than or equal to 300; the length is more than or equal to 100, and the number is less than or equal to 150. The loading number of the blades with complicated shapes or heavy weight is adjusted according to the actual situation; assembling the blades into a plastic roller according to the size of the blades;
(2) by calculating the time required for determining the group of blades and setting the time parameter of the milling, the thickness is reduced by 0.05mm to prevent excessive milling. Milling time = (blade milling amount-0.05)/milling speed of double faces.
6) Oil removal: placing a group of blades loaded in the step 5) in an oil removing tank for removing oil (the rotating speed of a roller is 10 revolutions per minute), keeping the blades for 4 minutes in a state of stirring by compressed air, and keeping the temperature at 100 ℃.
7) Cleaning: placing the group of blades subjected to oil removal in the step 6) in a hot water tank for washing (the rotating speed of a roller is 10 revolutions per minute), and keeping the blades for 2 minutes under the condition of stirring by compressed air at the temperature of 100 ℃; then, cold water washing (drum rotation speed 10 rpm) is carried out for 2 minutes at room temperature.
8) Chemical milling: placing the group of blades cleaned in the step 7) in a chemical milling groove for chemical milling (the rotating speed of a roller is 10 revolutions per minute), keeping the temperature at 70 ℃ under the condition of stirring by compressed air, and preferably controlling the chemical milling speed at 0.09mm per double surface.
9) Cleaning: placing a group of blades chemically milled in the step 8) in a cold water tank for washing (the rotating speed of a roller is 10 revolutions per minute), and keeping the blades for 2 minutes under the condition of stirring by compressed air at room temperature.
10 Removing hanging ash: the set of leaves washed in step 9) was placed in a neutralization tank for neutralization (drum rotation speed 10 rpm), and kept for 2 minutes under stirring with compressed air at room temperature.
11 Neutralization: placing the group of leaves washed in the step 9) in an ash removal groove for ash removal (the rotating speed of a roller is 10 revolutions per minute), and keeping the leaves for 2 minutes under the condition of stirring by compressed air at room temperature.
12 Cleaning: placing the group of the leaves neutralized in the step 10) in a cold water tank for washing (the rotating speed of a roller is 10 revolutions per minute), and keeping the leaves for 2 minutes in a state of stirring by compressed air at room temperature.
13 Unloading the blade): and opening a cabin door of the roller after the roller is washed by the water gun, immediately washing floating ash on the surface of the blade, and then washing the blade by the high-pressure water gun of the washing tank.
14 Cleaning: the removed group of leaves was rinsed in a hot water bath for 2 minutes at a temperature of 80 ℃.
15 Drying: the compressed air switch of the drying device is opened, and the blade is dried by hot compressed air.
16 Size checking: the thickness dimension of the blade is measured with an electric gauge.
17 ) repeated chemical milling: and (5) repeating the step 5) to the step 16), performing oil removal, chemical milling, ash removal, neutralization and corresponding cleaning on the part again, finally drying, and performing size inspection until the size after chemical milling meets the removal amount required by the blade. And carrying out chemical milling on the blades of other groups according to the steps.
18 Test) of: the appearance and dimensions are determined.
Example 3:
the embodiment of the invention provides a stainless steel milling solution and a chemical milling method thereof, which are realized by the following steps:
1) Measurement: preparing forged stainless steel blades, selecting three sections required to be detected by design on the blades, and measuring the thicknesses of three K point positions on each section by an electric inductance measuring instrument.
2) Grouping: comparing the thickness of each measuring point with the thickness of a standard blade, and grouping the thickness deviation T of 0.05mm, namely: 0.05 group when T is more than or equal to 0.05 and less than 0.1, 0.10 group when T is more than or equal to 0.1 and less than 0.15, 0.15 group when T is more than or equal to 0.15, 823060, 8230, and so on.
3) Preparing liquid: preparing a chemical milling agent in the chemical milling groove, wherein the concentration of the chemical milling agent is as follows: hydrofluoric acid: 150g/L; hydrochloric acid: 40g/L; nitric acid: 240g/L; the balance of water;
preparing a degreasing agent in the degreasing tank, wherein the concentration of the degreasing agent is as follows: sodium hydroxide: 75g/L; sodium carbonate: 45g/L; 10g/L of water glass; the balance of water;
preparing a solution in the ash removal tank, wherein the concentration of the solution is as follows: nitric acid: 410g/L; the balance of water;
preparing a neutralization tank solution in the neutralization tank, wherein the concentration of the neutralization tank solution is as follows: sodium carbonate: 70g/L; the balance of water.
4) Measuring speed: and (3) measuring the thickness of the thickest group of blades (at least 3 pieces) by using an inductance gauge during chemical milling every time, and measuring the thickness variation of the blades after chemical milling for 4 minutes.
5) Loading a blade: (1) the loading quantity is as follows: the length is less than or equal to 80, and the number is less than or equal to 400; the length is more than 80 and less than or equal to 100, and the number is less than or equal to 300; the length is more than or equal to 100, and the number is less than or equal to 150. The loading number of the blades with complicated shapes or heavy weight is adjusted according to the actual situation; according to the size of the blade, the blade is assembled into a plastic roller.
(2) By calculating the milling time required to determine the set of blades and setting the milling time parameter, the thickness is reduced by 0.05mm to prevent over-milling. Milling time = (blade milling amount-0.05)/milling speed of double faces.
6) Oil removal: placing a group of blades loaded in the step 5) in an oil removing tank for oil removal (the rotating speed of a roller is 10 revolutions per minute), and keeping the blades in a state of stirring by compressed air for 7 minutes at the temperature of 80 ℃.
7) Cleaning: placing the group of blades subjected to oil removal in the step 6) in a hot water tank for washing (the rotating speed of a roller is 10 revolutions per minute), and keeping the blades for 1 minute under the condition of stirring by compressed air at the temperature of 80 ℃; then, cold water washing (drum rotation speed 10 rpm) is carried out for 1 minute at room temperature.
8) Chemical milling: placing the group of blades cleaned in the step 7) in a chemical milling groove for chemical milling (the rotating speed of a roller is 10 revolutions per minute), keeping the temperature at 60 ℃ under the condition of stirring by compressed air, and preferably controlling the chemical milling speed at 0.08mm per double surfaces.
9) Cleaning: placing a group of blades chemically milled in the step 8) in a cold water tank for washing (the rotating speed of a roller is 10 revolutions per minute), and keeping the blades for 1 minute under the condition of stirring by compressed air at room temperature.
10 Removing hanging ash: placing the group of the blades washed in the step 9) in a neutralization tank for neutralization (the rotation speed of a roller is 10 revolutions per minute), and keeping the blades for 1 minute in a state of stirring by compressed air at room temperature.
11 Neutralization: placing the group of the blades cleaned in the step 9) in an ash removal groove for removing and hanging ash (the rotating speed of a roller is 10 revolutions per minute), keeping the blades for 1 minute in a state of stirring by compressed air, and keeping the blades at room temperature.
12 Cleaning: placing the group of the blades neutralized in the step 10) in a cold water tank for washing (the rotating speed of a roller is 10 revolutions per minute), and keeping the blades for 1 minute in a state of stirring by compressed air at room temperature.
13 Unloading the blade): and opening a cabin door of the roller after the roller is washed by the water gun, immediately washing floating ash on the surface of the blade, and then washing the blade by the high-pressure water gun of the washing tank.
14 Cleaning: the removed group of leaves was rinsed in a hot water bath at 85 ℃ for 2 minutes.
15 Drying: the compressed air switch of the blow-drying device is turned on, and the blades are blow-dried by hot compressed air.
16 Size check): the thickness dimension of the blade is measured with an electrical gauge.
17 Repeat chemical milling: and (5) repeating the step 5) -the step 16), performing oil removal, chemical milling, ash removal, neutralization and corresponding cleaning on the part again, finally drying, and performing size inspection until the size after chemical milling meets the removal amount required by the blade. And carrying out chemical milling on the blades of other groups according to the steps.
18 Test): the appearance and dimensions are determined.
While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art. The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (10)
1. A chemical milling solution for stainless steel is characterized in that,
the chemical milling solution comprises: hydrofluoric acid: 130-150 g/L; hydrochloric acid: 30-50 g/L; nitric acid: 200-25) g/L.
2. A chemical milling method based on the chemical milling solution for the stainless steel of claim 1, characterized in that the chemical milling method comprises the following steps:
s1: measuring initial data of a workpiece to be processed;
s2: preparing a chemical milling solution, and then putting a workpiece to be processed into the chemical milling solution for chemical milling;
s3: and (4) checking the workpiece after chemical milling, comparing with the standard workpiece to determine whether the removal quantity requirement is met, and repeating the chemical milling if the removal quantity requirement is not met.
3. A chemical milling method for stainless steel according to claim 2,
when measuring the initial data of the workpiece to be processed, firstly, the section thickness of the workpiece to be processed is measured, and the section thickness of the workpiece to be processed is compared with the section thickness of the standard workpiece.
4. A chemical milling method for stainless steel according to claim 2,
chemical milling pretreatment is required before chemical milling, and comprises the following steps:
s2.1: putting a workpiece to be processed into a chemical milling solution, carrying out chemical milling for a minutes,
s2.2: taking out the workpiece which is subjected to the chemical milling for a minutes, and measuring the thickness of the workpiece which is subjected to the chemical milling for a minutes;
s2.3: and calculating the chemical milling speed according to the section thickness of the workpiece to be processed and the a minute thickness of the workpiece after chemical milling, and calculating the time required for milling the blade to the section thickness of the standard workpiece.
5. A chemical milling method for stainless steel according to claim 2,
performing pretreatment before chemical milling, wherein the pretreatment comprises the following steps:
degreasing the workpiece to be processed by using a degreasing agent;
and carrying out secondary cleaning on the workpiece to be processed after oil removal.
6. A chemical milling method for stainless steel according to claim 2,
post-processing is carried out after chemical milling, and the post-processing comprises the following steps:
firstly, cleaning for one time after chemical milling is finished;
removing hanging ash on the workpiece after the primary cleaning is finished;
after the ash removal is finished, putting the mixture into a neutralization tank for neutralization;
carrying out secondary cleaning after the neutralization is finished;
and drying the workpiece subjected to the secondary cleaning.
7. A chemical milling method for stainless steel according to claim 6,
the secondary cleaning comprises the following steps: a cold water rinse and a hot water rinse.
8. A chemical milling method for stainless steel according to claim 5,
the oil removal is carried out by using an oil removal agent, and the oil removal agent comprises sodium hydroxide with the concentration of (55-75) g/L; (35-45) g/L of sodium carbonate; (7-10) g/L of water glass and water.
9. A chemical milling method for stainless steel according to claim 6, wherein ash removal is carried out by using ash removal tank liquor during post-treatment after chemical milling, and the ash removal tank liquor comprises nitric acid with concentration of 380-410 g/L and water.
10. The chemical milling method for stainless steel according to claim 6, wherein a neutralization tank liquid is arranged in the neutralization tank, and the neutralization tank liquid comprises sodium carbonate with the concentration of (55-70) g/L and water.
Priority Applications (1)
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| DE2226535A1 (en) * | 1972-05-31 | 1973-12-06 | Armco Steel Corp | Chemically milling stainless steel - to obtain dull defect-free wire for fasteners prodn |
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| CN110835760A (en) * | 2019-11-28 | 2020-02-25 | 陕西斯坦特生物科技有限公司 | Chemical milling method for stainless steel precision forging blade |
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