CN113388842B - Low-cost CuCr contact surface deoxidation auxiliary metal processing technology - Google Patents
Low-cost CuCr contact surface deoxidation auxiliary metal processing technology Download PDFInfo
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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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/10—Other heavy metals
- C23G1/103—Other heavy metals copper or alloys of copper
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
- B24B1/005—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes using a magnetic polishing agent
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a low-cost CuCr contact surface deoxidation auxiliary metal processing technology, which relates to the technical field of electric contact deoxidation, and comprises S1, material selection: selecting an oxidized CuCr contact; s2, surface activation: activating the surface of the oxidized CuCr contact by an activator; s3, washing with deionized water: cleaning a CuCr contact through deionized water; s4, dehydrating with absolute ethyl alcohol: dehydrating the CuCr contact through absolute ethyl alcohol; s5, purging and air-drying by argon gas: air-drying the CuCr contact through argon; s7, pre-checking: pre-inspecting the CuCr contact; s8, magnetic grinding: magnetic grinding is carried out on the CuCr contact; s9, vacuum degreasing, cleaning and drying: carrying out vacuum degreasing, cleaning and drying on the CuCr contact; s10, encapsulation: vacuum packaging the CuCr contact and warehousing; the invention has the characteristics of low production cost, simple process, suitability for processing complex parts, easy control of the process, small environmental pollution, mass production and the like.
Description
Technical Field
The invention relates to the technical field of electric contact deoxidation, in particular to a low-cost CuCr contact surface deoxidation auxiliary metal processing technology.
Background
The electrical contact is an important part of medium and high voltage circuit breakers, switch cabinets, isolating switches and grounding switches, and the main performance and the service life of the switching device depend on the performance of the electrical contact to a great extent. Electrical contacts are generally required to have good electrical conductivity, low contact resistance, high fusion welding resistance, high arc erosion resistance and high material transfer resistance, and for CuCr vacuum electrical contact materials, small cutoff values, high compressive strength and high breaking capacity are also required. The electric contacts are various in types, different electric contacts are processed in different modes, burrs and oil stains generated in the processing process are remained on the surface of the CuCr contact which is just produced, and the performance of the electric contact can be directly influenced by surface dirt impurities, oxidation and the like.
In the production and processing process, the CuCr contact is easy to oxidize, which always troubles the contact processing industry, because the oxide generated on the surface of the CuCr contact can increase the contact resistance, once the CuCr contact is put into use, the temperature rise of the contact is increased, which easily causes the power supply interruption, thus the production and the life are influenced, and the major accident is caused. Currently, in the processing and post-treatment processes of the CuCr contact, polishing treatment is generally performed to improve the use quality and appearance of the surface of the CuCr contact. The polishing mainly comprises chemical polishing and mechanical polishing, wherein the chemical polishing is to ensure that the metal surface is bright and smooth by regular dissolution, and the chemical polishing can fill pores, scratches and other surface defects on the surface so as to improve the fatigue resistance and the corrosion resistance. The mechanical polishing commonly used at present depends on the grinding and rolling action of very fine polishing powder to remove a very thin layer of metal on the polished surface of a sample. The mechanical polishing is divided into a dry polishing process and a wet polishing process, in the dry polishing process, the equipment investment is small, the brightness of a polished product is high, the polishing effect is directional, but the mirror surface degree is not high, a large amount of dust is generated in the process, the processing is difficult, the manual dependence is strong, and the processing cost is high. In the wet polishing process, the equipment investment is large, the brightness is dark, the polished product has good mirror surface and no directivity, the generated dust flows out along with the polishing solution, a large amount of waste liquid is generated, and the environmental pollution is large; meanwhile, if the machined contact is not cleaned and dried in time, the machined contact can be oxidized and blackened, and powder and scraps can be adhered to the grinding head, so that the grinding head cannot be used for continuously grinding. Meanwhile, according to different oxidation degrees of the surface of the contact and different specifications of the contact, the polishing force and parameters are often required to be adjusted manually and continuously, so that the problem that the contact is deformed in size due to overlarge polishing force, oxidation cannot be thoroughly removed at positions such as an inner hole, an inner groove, a concave-convex surface, a dead angle, an inner thread and an outer thread is solved, in order to ensure the appearance consistency of a product, appearance treatment needs to be carried out on an unoxidized product, namely 100% mechanical polishing and deoxidation are carried out, the comprehensive efficiency is low, secondary oxidation risks exist in the product repairing and processing process, repeated waste of operation is caused, and the product quality is also influenced to a certain extent.
Disclosure of Invention
In order to solve the technical problem, the invention provides a low-cost CuCr contact surface deoxidation auxiliary metal processing technology.
The technical scheme of the invention is as follows: a low-cost CuCr contact surface deoxidation auxiliary metal processing technology comprises the following steps:
s1: selecting materials
Testing and selecting the CuCr contact oxidized in the production and processing process, and putting the oxidized CuCr contact into a prefabricated cleaning tool;
s2: surface activation
Preparing an activation solvent in a PP (polypropylene) liquid storage tank according to the volume ratio of the precision environment-friendly cleaning agent to deionized water of 1;
s3: washing with deionized water
Carrying out three-pass flowing deionized water washing on the CuCr contact with the surface activated and oxidized, and keeping blowing in the washing process to obtain the CuCr contact without the drop flow mark on the surface;
s4: dehydration with anhydrous ethanol
Dehydrating the CuCr contact without the surface having the bead-hanging flow marks by using absolute ethyl alcohol, ensuring that the contact is fully contacted with the absolute ethyl alcohol, wherein the dehydration temperature is 10-30 ℃, and the dehydration time is 60-180 s, so as to obtain a dehydrated CuCr contact;
s5: blowing and air drying by argon
Blowing and air-drying the dehydrated CuCr contact by adopting inert gas argon, continuously blowing and air-drying for 1-3 min, and ensuring that each position of the contact is air-dried thoroughly to obtain an air-dried CuCr contact;
s6: vacuum drying
Putting the air-dried CuCr contact into a vacuum oven to be dried for 10-15 min, and setting the temperature to be 70 ℃ to obtain a dried CuCr contact;
s7: preliminary examination
Pre-inspecting the dried CuCr contact, and selecting the CuCr contact which is not completely removed by oxidation for reworking to obtain a good-quality CuCr contact;
s8: magnetic grinding
Paving a good CuCr contact in a square stainless steel washing basket, adding extreme pressure precision cutting oil as grinding oil into a grinding groove, adding 3kg-5kg of magnetized stainless steel needles, and setting grinding parameters: the frequency is 30Hz-60Hz, the time is 10min-30min, and the magnetic field exchange time is 1min, so that a ground CuCr contact is obtained;
s9: vacuum degreasing, cleaning and drying
Putting the ground CuCr contact into a vacuum cleaning machine for cleaning and drying, wherein the solvent in the vacuum cleaning machine is an environment-friendly hydrocarbon solvent which does not corrode the contact, and cleaning and drying the contact by the vacuum cleaning machine to obtain a degreased CuCr contact;
s10: encapsulation
And finally inspecting the obtained degreased CuCr contact, vacuumizing and encapsulating the qualified CuCr contact after final inspection, and then warehousing.
Further, in the step S1, the cleaning tool is a stainless steel washing basket coated with polytetrafluoroethylene, and the stainless steel washing basket is convenient to clean.
Further, the precise environment-friendly cleaning agent comprises the following components in percentage by mass: 1-3% of brightener, 1-5% of alkyl glycoside, 1-3% of acetic acid, 2-10% of citric acid, 10-30% of fatty alcohol-polyoxyethylene ether and the balance of deionized water, and aims to remove surface oxidation impurities, dirt and the like without affecting the surface color of the contact.
Further, the purity of the absolute ethyl alcohol in the step S4 is more than 97%, and the cleaning effect is good.
Further, in the step S1, the oxidized CuCr contacts are placed in a prefabricated cleaning tool, so that no overlapping of the contacts needs to be ensured, and incomplete cleaning is prevented.
Further, the air speed in the step S5 is 0.5m/S-1.2m/S when the argon is blown and dried, and the drying effect is good when the air speed is 0.5m/S-1.2 m/S.
Furthermore, the stainless steel needle in the step S8 has a diameter of 0.2mm-0.8mm and a good grinding effect when the diameter of the stainless steel needle is 0.2mm-0.8 mm.
Further, in the step S9, the distilled solvent is reused during vacuum degreasing and cleaning, and the cleanliness of the degreased CuCr contact obtained after cleaning is less than 5RFU, so that the cleanness of the CuCr contact is ensured.
Furthermore, in the step S3, the deionized water is washed for 30-60S, the dripping time is 10-30S, the washing temperature is 10-30 ℃, the pH is kept at 6-7, and the conductivity is less than 10us/cm, so that the CuCr contact can be effectively washed under the washing parameters, and the time is not wasted.
Further, the activation temperature during surface activation is 20-40 ℃, the activation time is 30-120 s, the water dropping time is 10-15 s, the pH value of the solvent is kept at 1-2, and the surface activation of the CuCr contact is ensured.
Further, the cleaning parameters of the vacuum cleaning machine in step S9: performing vapor degreasing for 30-60 s, performing ultrasonic cleaning for 60-180 s, spraying for 30-90 s, performing vapor degreasing for 30-90 s, performing vacuum drying for 300-480 s, removing grease on the surface of the CuCr contact, and performing vacuum drying to prevent secondary oxidation.
The invention has the beneficial effects that:
the invention provides a processing technology for removing oxidation of a CuCr contact surface to assist metal processing, which has the characteristics of low production cost, simple process, suitability for complex part processing, easily controlled process, small environmental pollution, batch production and the like. The method is applied to the auxiliary metal processing treatment of the surface deoxidation of the CuCr contact, can effectively remove oxidation spots on the surface of the CuCr contact, inner holes, inner grooves, concave-convex surfaces, dead corners, internal and external threads and other parts of the CuCr contact under the condition of not changing the appearance color of the contact, improves the surface quality, has high comprehensive efficiency, reduces the production cost and improves the service electrical property of the CuCr contact.
Drawings
FIG. 1 is a schematic flow diagram of the present invention.
FIG. 2 is an appearance view of a CuCr contact before and after deoxidation according to the present invention.
FIG. 3 is a comparison of the surface topography of a CuCr normal contact and a deoxidized CuCr contact of the present invention.
FIG. 4 is a comparison of the surface composition of a CuCr normal contact of the present invention and a CuCr contact after deoxidation.
Detailed Description
Example 1:
as shown in fig. 1, a low-cost processing technique for removing oxidation auxiliary metal on the surface of a CuCr contact comprises the following steps:
s1: selecting materials
The method comprises the steps of detecting and selecting oxidized CuCr contacts in the production and processing process, putting the oxidized CuCr contacts into a prefabricated cleaning tool, wherein the cleaning tool is a stainless steel washing basket coated with polytetrafluoroethylene, the stainless steel washing basket is convenient to clean, and the oxidized CuCr contacts are put into the prefabricated cleaning tool, so that no overlapping among the contacts is required to be ensured, and incomplete cleaning is prevented;
s2: surface activation
The cleaning agent is prepared from the following raw materials in percentage by mass: 1% of brightener, 1% of alkyl glycoside, 1% of acetic acid, 2% of citric acid, 10% of fatty alcohol-polyoxyethylene ether and the balance of deionized water, wherein the purpose is to remove surface oxidation impurities, dirt and the like without affecting the surface color of the contact, an activating solvent is prepared in a PP (polypropylene) liquid storage tank according to the volume ratio of 1.
S3: washing with deionized water
And (2) carrying out three-pass flowing deionized water washing on the CuCr contact with the surface activated and oxidized, wherein the deionized water washing time is 30s, the water dropping time is 10s, the washing temperature is 10 ℃, the pH value is kept to be 6, and the conductivity is 9us/cm, the CuCr contact can be effectively washed under the washing parameters, the time is not wasted, and the air blowing is kept in the washing process, so that the CuCr contact without the drop flow mark on the surface is obtained.
S4: dehydration with anhydrous ethanol
Dehydrating the CuCr contact without the surface having the bead-hanging flow marks by using absolute ethyl alcohol, wherein the purity of the absolute ethyl alcohol is 98%, the cleaning effect is good, the contact is ensured to be fully contacted with the absolute ethyl alcohol, the dehydration temperature is 10 ℃, and the dehydration time is 60s, so that the dehydrated CuCr contact is obtained;
s5: blowing and air drying by argon
Blowing and air-drying the dehydrated CuCr contact by adopting inert gas argon, continuously blowing and air-drying for 1min, wherein the air speed during blowing and air-drying by using argon is 0.5m/s, the air speed is 0.5m/s, the drying effect is good, and the air-drying at each position of the contact is ensured to be thorough, so that the air-dried CuCr contact is obtained;
s6: vacuum drying
Putting the air-dried CuCr contact into a vacuum oven to be dried for 10min, and setting the temperature to be 70 ℃ to obtain a dried CuCr contact;
s7: preliminary examination
And (4) performing pre-inspection on the dried CuCr contact, and selecting the CuCr contact which is not completely removed by oxidation for reworking to obtain a good-quality CuCr contact.
S8: magnetic grinding
Tiling the contact of non-defective products CuCr in square stainless steel wash basket, add extreme pressure precision cutting oil as grinding oil in grinding the inslot, add 3kg magnetization stainless steel needle, stainless steel needle diameter is 0.2mm, and the diameter is that 0.2mm stainless steel needle grinds effectually, sets up the grinding parameter: the frequency is 30Hz, the time is 10min, and the magnetic field exchange time is 1min, so that a ground CuCr contact is obtained;
s9: vacuum degreasing, cleaning and drying
Putting the ground CuCr contact into a vacuum cleaning machine for cleaning and drying, wherein the solvent in the vacuum cleaning machine adopts an environment-friendly hydrocarbon solvent which does not corrode the contact, and the contact is cleaned and dried by the vacuum cleaning machine to obtain a degreased CuCr contact, and the cleaning parameters of the vacuum cleaning machine are as follows: degreasing the CuCr contact by steam for 30s, cleaning by ultrasonic for 60s, spraying for 30s, degreasing by steam for 30s, drying in vacuum for 300s, removing grease on the surface of the CuCr contact, drying in vacuum to prevent reoxidation, reusing a distilled solvent during vacuum degreasing cleaning, and ensuring that the cleanliness of the degreased CuCr contact obtained after cleaning is 1.3RFU to ensure that the CuCr contact is clean;
s10: encapsulation
And finally inspecting the obtained degreased CuCr contact, vacuumizing and encapsulating the qualified CuCr contact after final inspection, and then warehousing.
Example 2:
as shown in fig. 1, a low-cost processing technique for removing oxidation auxiliary metal on the surface of a CuCr contact comprises the following steps:
s1: selecting materials
The method comprises the steps of detecting and selecting oxidized CuCr contacts in the production and processing process, putting the oxidized CuCr contacts into a prefabricated cleaning tool, wherein the cleaning tool is a stainless steel washing basket coated with polytetrafluoroethylene, the stainless steel washing basket is convenient to clean, and the oxidized CuCr contacts are put into the prefabricated cleaning tool, so that no overlapping among the contacts is required to be ensured, and incomplete cleaning is prevented;
s2: surface activation
The cleaning agent is prepared from the following raw materials in percentage by mass: 2% of brightener, 3% of alkyl glycoside, 2% of acetic acid, 5% of citric acid, 20% of fatty alcohol-polyoxyethylene ether and the balance of deionized water, and aims to remove surface oxidation impurities, dirt and the like without affecting the surface color of the contact, an activating solvent is prepared in a PP liquid storage tank according to the volume ratio of a precision environment-friendly cleaning agent to the deionized water of 1.
S3: washing with deionized water
And (2) carrying out three-pass flowing deionized water washing on the CuCr contact with the surface activated and oxidized, wherein the deionized water washing time is 50s, the water dripping time is 20s, the washing temperature is 20 ℃, the pH is kept to be 7, and the conductivity is 8us/cm, the CuCr contact can be effectively washed under the washing parameters, the time is not wasted, and the air blowing is kept in the washing process, so that the CuCr contact without bead-hanging flow marks on the surface is obtained.
S4: dehydration with anhydrous ethanol
Dehydrating the CuCr contact without the surface having the bead-hanging flow marks by using absolute ethyl alcohol, wherein the purity of the absolute ethyl alcohol is 99%, the cleaning effect is good, the contact is ensured to be fully contacted with the absolute ethyl alcohol, the dehydration temperature is 20 ℃, and the dehydration time is 100s, so that the dehydrated CuCr contact is obtained;
s5: blowing and air drying by argon
Blowing and air-drying the dehydrated CuCr contact by adopting inert gas argon, continuously blowing and air-drying for 2min, wherein the air speed during blowing and air-drying by using argon is 1m/s, the air speed is 1m/s, the drying effect is good, and the contact is ensured to be thoroughly air-dried at each position to obtain an air-dried CuCr contact;
s6: vacuum drying
Putting the air-dried CuCr contact into a vacuum oven to be dried for 13min, and setting the temperature to be 70 ℃ to obtain a dried CuCr contact;
s7: preliminary examination
And (4) performing pre-inspection on the dried CuCr contact, and selecting the CuCr contact which is not completely removed by oxidation for reworking to obtain a good-quality CuCr contact.
S8: magnetic grinding
Tiling a good-product CuCr contact in a square stainless steel washing basket, adding extreme-pressure precise cutting oil in a grinding groove to serve as grinding oil, adding 4kg of magnetized stainless steel needles, wherein the stainless steel needles have the diameter of 0.5mm and the diameter of 0.5mm, have good grinding effect, and setting grinding parameters: the frequency is 50Hz, the time is 20min, and the magnetic field exchange time is 1min, so that the ground CuCr contact is obtained;
s9: vacuum degreasing, cleaning and drying
Putting the ground CuCr contact into a vacuum cleaning machine for cleaning and drying, wherein the solvent in the vacuum cleaning machine adopts an environment-friendly hydrocarbon solvent which does not corrode the contact, and the contact is cleaned and dried by the vacuum cleaning machine to obtain a degreased CuCr contact, and the cleaning parameters of the vacuum cleaning machine are as follows: the method comprises the following steps of (1) degreasing with steam for 50s, ultrasonically cleaning for 100s, spraying for 60s, degreasing with steam for 60s, drying in vacuum for 400s, removing grease on the surface of the CuCr contact, drying in vacuum to prevent reoxidation, repeatedly using a distilled solvent during vacuum degreasing cleaning, and ensuring that the cleanliness of the degreased CuCr contact obtained after cleaning is 1.5RFU to ensure that the CuCr contact is clean;
s10: encapsulation
And finally inspecting the obtained degreased CuCr contact, vacuumizing and encapsulating the qualified CuCr contact after final inspection, and then warehousing.
Example 3:
as shown in fig. 1, a low-cost processing technique for removing oxidation auxiliary metal on the surface of a CuCr contact comprises the following steps:
s1: selecting materials
The method comprises the steps of detecting and selecting oxidized CuCr contacts in the production and processing process, putting the oxidized CuCr contacts into a prefabricated cleaning tool, wherein the cleaning tool is a stainless steel washing basket coated with polytetrafluoroethylene, the stainless steel washing basket is convenient to clean, and the oxidized CuCr contacts are put into the prefabricated cleaning tool, so that no overlapping among the contacts is required to be ensured, and incomplete cleaning is prevented;
s2: surface activation
The cleaning agent is prepared from the following raw materials in percentage by mass: 3% of brightener, 5% of alkyl glycoside, 3% of acetic acid, 10% of citric acid, 30% of fatty alcohol-polyoxyethylene ether and the balance of deionized water, and aims to remove surface oxidation impurities, dirt and the like without affecting the surface color of the contact, an activating solvent is prepared in a PP liquid storage tank according to the volume ratio of a precision environment-friendly cleaning agent to the deionized water of 1.
S3: washing with deionized water
And (2) washing the CuCr contact with the activated and oxidized surface by three flows of deionized water, wherein the washing time of the deionized water is 60s, the dripping time is 30s, the washing temperature is 30 ℃, the pH is kept at 7, and the conductivity is 7us/cm, under the washing parameters, the CuCr contact can be effectively washed, the time is not wasted, and the air blowing is kept in the washing process, so that the CuCr contact without the sagging and sagging marks on the surface is obtained.
S4: dehydration with anhydrous ethanol
Dehydrating the CuCr contact without the surface having the bead-hanging flow marks by using absolute ethyl alcohol, wherein the purity of the absolute ethyl alcohol is 99%, the cleaning effect is good, the contact is ensured to be fully contacted with the absolute ethyl alcohol, the dehydration temperature is 30 ℃, and the dehydration time is 180s, so that the dehydrated CuCr contact is obtained;
s5: blowing and air drying by argon
Blowing and air-drying the dehydrated CuCr contact by adopting inert gas argon, continuously blowing and air-drying for 3min, wherein the air speed during blowing and air-drying by using argon is 1.2m/s, the air speed is 1.2m/s, the drying effect is good, and the air-drying at each position of the contact is ensured to be thorough, so that the air-dried CuCr contact is obtained;
s6: vacuum drying
Putting the air-dried CuCr contact into a vacuum oven to be dried for 15min, and setting the temperature to be 70 ℃ to obtain a dried CuCr contact;
s7: preliminary examination
And (4) performing pre-inspection on the dried CuCr contact, and selecting the CuCr contact which is not completely removed by oxidation for reworking to obtain a good-quality CuCr contact.
S8: magnetic grinding
Tiling the good CuCr contact in a square stainless steel washing basket, adding extreme pressure precision cutting oil as grinding oil into a grinding groove, adding 5kg of magnetized stainless steel needles, wherein the stainless steel needles have the diameter of 0.8mm and the diameter of 0.8mm, have good grinding effect, and set grinding parameters: the frequency is 60Hz, the time is 30min, and the magnetic field exchange time is 1min, so that a ground CuCr contact is obtained;
s9: vacuum degreasing, cleaning and drying
Putting the ground CuCr contact into a vacuum cleaning machine for cleaning and drying, wherein the solvent in the vacuum cleaning machine adopts an environment-friendly hydrocarbon solvent which does not corrode the contact, and the contact is cleaned and dried by the vacuum cleaning machine to obtain a degreased CuCr contact, and the cleaning parameters of the vacuum cleaning machine are as follows: degreasing with steam for 60s, cleaning with ultrasonic for 180s, spraying for 90s, degreasing with steam for 90s, drying in vacuum for 480s, removing grease on the surface of the CuCr contact, drying in vacuum to prevent reoxidation, reusing the distilled solvent during vacuum degreasing cleaning, and ensuring that the cleanliness of the degreased CuCr contact obtained after cleaning is 1.2RFU to ensure that the CuCr contact is clean;
s10: encapsulation
And finally inspecting the obtained degreased CuCr contact, vacuumizing and encapsulating the qualified CuCr contact after final inspection, and then warehousing.
As shown in FIG. 2, the CuCr contact before and after deoxidation had a significant gap.
As shown in FIG. 3, the CuCr contact after oxidation removal has no difference from the CuCr normal contact.
As shown in fig. 4, the surface composition of the CuCr normal contact and the post-deoxidized CuCr contact are measured, and the results are shown in table 1.
Table 1: surface component detection results of CuCr normal contact and deoxidized CuCr contact
It can be seen from Table 1 that there is no difference in the surface composition between the CuCr normal contact and the deoxidized CuCr contact
The cleanliness of the CuCr normal contact and the deoxidized CuCr contact are tested as shown in Table 2.
Table 2: cleanliness test results of CuCr normal contact and deoxidized CuCr contact
As can be seen from the comparison results in Table 1, there is no difference in cleanliness between the deoxidized CuCr contact and the CuCr normal contact.
Claims (4)
1. A low-cost CuCr contact surface deoxidation auxiliary metal processing technology is characterized by comprising the following steps:
s1: selecting materials
Inspecting and selecting the oxidized CuCr contact in the production and processing process, and putting the oxidized CuCr contact into a prefabricated cleaning tool;
s2: surface activation
Preparing an activation solvent in a PP (polypropylene) liquid storage tank according to the volume ratio of the precision environment-friendly cleaning agent to deionized water of 1;
s3: washing with deionized water
Carrying out three-pass flowing deionized water washing on the CuCr contact with the surface activated and oxidized, and keeping blowing in the washing process to obtain the CuCr contact without the drop flow mark on the surface;
s4: dehydration with anhydrous ethanol
Dehydrating the CuCr contact without the surface having the bead-hanging flow marks by using absolute ethyl alcohol, ensuring that the contact is fully contacted with the absolute ethyl alcohol, wherein the dehydration temperature is 10-30 ℃, and the dehydration time is 60-180 s, so as to obtain a dehydrated CuCr contact;
s5: blowing and air drying by argon
Blowing and air-drying the dehydrated CuCr contact by adopting inert gas argon, continuously blowing and air-drying for 1-3 min, and ensuring that each position of the contact is air-dried thoroughly to obtain an air-dried CuCr contact;
s6: vacuum drying
Putting the air-dried CuCr contact into a vacuum oven to be dried for 10-15 min, and setting the temperature to be 70 ℃ to obtain a dried CuCr contact;
s7: preliminary examination
Pre-inspecting the dried CuCr contact, and selecting the CuCr contact which is not completely removed by oxidation for reworking to obtain a good-quality CuCr contact;
s8: magnetic grinding
Paving a good CuCr contact in a square stainless steel washing basket, adding extreme pressure precision cutting oil as grinding oil into a grinding groove, adding 3kg-5kg of magnetized stainless steel needles, and setting grinding parameters: the frequency is 30Hz-60Hz, the time is 10min-30min, and the magnetic field exchange time is 1min, so that a ground CuCr contact is obtained;
s9: vacuum degreasing, cleaning and drying
Putting the ground CuCr contact into a vacuum cleaning machine for cleaning and drying, wherein the solvent in the vacuum cleaning machine is an environment-friendly hydrocarbon solvent which does not corrode the contact, and cleaning and drying the contact by the vacuum cleaning machine to obtain a degreased CuCr contact;
s10: encapsulation
Performing final inspection on the obtained degreased CuCr contact, performing vacuum-pumping encapsulation on the CuCr contact qualified in the final inspection, and then warehousing;
the cleaning tool in the step S1 is a stainless steel cleaning basket coated with polytetrafluoroethylene;
the precise environment-friendly cleaning agent comprises the following components in percentage by mass: 1-3% of brightener, 1-5% of alkyl glycoside, 1-3% of acetic acid, 2-10% of citric acid, 10-30% of fatty alcohol-polyoxyethylene ether and the balance of deionized water;
the purity of the absolute ethyl alcohol in the step S4 is more than 97 percent;
step S1, placing oxidized CuCr contacts into a prefabricated cleaning tool to ensure that no contact is overlapped;
in the step S5, the air speed is 0.5m/S-1.2m/S when the argon is blown and dried;
the diameter of the stainless steel needle in the step S8 is 0.2mm-0.8mm;
and S9, repeatedly using the distilled solvent during vacuum degreasing and cleaning, wherein the cleanliness of the degreased CuCr contact obtained after cleaning is less than 5RFU.
2. The process for removing oxidation-assisted metal from the surface of the low-cost CuCr contact as claimed in claim 1, wherein in step S3, deionized water is washed for 30-60S, the dripping time is 10-30S, the washing temperature is 10-30 ℃, the pH is kept at 6-7, and the conductivity is less than 10us/cm.
3. The low-cost CuCr contact surface deoxidation auxiliary metal processing technology according to claim 1, wherein the surface activation temperature is 20-40 ℃, the activation time is 30-120 s, the water dropping time is 10-15 s, and the pH value of the solvent is kept at 1-2.
4. The low-cost CuCr contact surface deoxidation auxiliary metal processing process of claim 1, wherein the cleaning parameters of the vacuum cleaner in step S9 are as follows: degreasing with steam for 30-60 s, ultrasonically cleaning for 60-180 s, spraying for 30-90 s, degreasing with steam for 30-90 s, and vacuum drying for 300-480 s.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110547352.9A CN113388842B (en) | 2021-05-19 | 2021-05-19 | Low-cost CuCr contact surface deoxidation auxiliary metal processing technology |
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| CN112658243A (en) * | 2020-11-21 | 2021-04-16 | 陕西斯瑞新材料股份有限公司 | Preparation method of CuW/CuCr integral contact |
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| CN109676438A (en) * | 2018-11-23 | 2019-04-26 | 安徽银点电子科技有限公司 | A kind of electrical contact deburring cleaning polishing technique |
| CN112454013B (en) * | 2020-10-16 | 2021-10-22 | 陕西斯瑞新材料股份有限公司 | Auxiliary metal processing technology for CuCr contact surface treatment processing |
| CN112496484A (en) * | 2020-10-19 | 2021-03-16 | 陕西斯瑞新材料股份有限公司 | Metal auxiliary machining process for plasma deburring of copper alloy contact |
| CN112518434B (en) * | 2020-10-20 | 2021-10-01 | 陕西斯瑞新材料股份有限公司 | Metal auxiliary machining process for removing burrs of CuCr contact by physical method |
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| CN112658243A (en) * | 2020-11-21 | 2021-04-16 | 陕西斯瑞新材料股份有限公司 | Preparation method of CuW/CuCr integral contact |
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