CN109015328A - A method of removal rivet type electrical contact surface defect is polished based on magnetic force - Google Patents
A method of removal rivet type electrical contact surface defect is polished based on magnetic force Download PDFInfo
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- CN109015328A CN109015328A CN201810975028.5A CN201810975028A CN109015328A CN 109015328 A CN109015328 A CN 109015328A CN 201810975028 A CN201810975028 A CN 201810975028A CN 109015328 A CN109015328 A CN 109015328A
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- magnetic force
- acid
- stain
- polishing
- electrical contact
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Classifications
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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
- B24B31/00—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor
- B24B31/10—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor involving other means for tumbling of work
- B24B31/102—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor involving other means for tumbling of work using an alternating magnetic field
-
- 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
- B24B31/00—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor
- B24B31/12—Accessories; Protective equipment or safety devices; Installations for exhaustion of dust or for sound absorption specially adapted for machines covered by group B24B31/00
- B24B31/14—Abrading-bodies specially designed for tumbling apparatus, e.g. abrading-balls
-
- 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
- C23F3/00—Brightening metals by chemical means
- C23F3/04—Heavy metals
- C23F3/06—Heavy metals with acidic solutions
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- ing And Chemical Polishing (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention discloses a kind of methods for polishing removal rivet type electrical contact surface defect based on magnetic force, this method is suitable for removing the defect that silver alloy/copper rivet type electrical contact is generated in preceding working procedure, the especially method of working face foreign matter (hereinafter referred to as stain).Main process includes: configuration polishing fluid, rivet to be processed, magnetic force steel needle, the polishing fluid and water are added in grinding drum, start magnetic field, polishing grinding removal is carried out to the stain on rivet to be processed, the polishing fluid includes: inorganic acid 10-15%, organic acid 5-10%, corrosion inhibiter 3-8%, remaining is water；The corrosion inhibiter includes benzotriazole and methylbenzotriazole, this includes the mass ratio of benzotriazole and methylbenzotriazole are as follows: 1/4-2/3.This method configuration is suitble to the polishing fluid of removal stain to utilize the distinctive magnetic line of force distribution of alternating magnetic field simultaneously, generate powerful stable magnetic strength effect, it carries out magnetic force steel needle with rivet work face comprehensive, is fully ground with multi-angle, reaches the effect of rapidly removing except stain.
Description
Technical field
The present invention relates to a kind of field of surface treatment of metal material, in particular to a kind of polished based on magnetic force to remove rivet
The method of type electrical contact surface defect.
Background technique
Rivet type electrical contact is applied to the contactor of various relays, contactor, temperature controller, various current classes, is shadow
Ring device for switching contact system functional reliability an important factor for, preparation process generally comprise system beat, grind, annealing, pickling,
Polishing etc., often there is stain in working face after grinding, is in granular form distribution, while having certain depth attachment, after tested stain
Ingredient mainly includes C, O, Fe, Cu etc., through analysis stain in rivet process of lapping, trigone used in the process
The organic gel (ingredient C, O) that column, cylindrical abrasive material make solidifies, and is embedded into rivet work face in process of lapping, Fe powder conduct
Abrasive material, Cu are rivet bodies, are equally embedded into working face in process of lapping, these factors together form stain.Stain one
Denier formation is difficult to remove, because stain is small in size and penetrates into inside rivet work face under " capillary " effect, uses
Common polishing can only clear up face surface, but stain reach certain depth after be difficult to remove.Therefore, how research goes
Except the stain of rivet type electrical contact working face, to improving rivet type electrical contact product quality and improving there is highly important reality to anticipate
Justice.
Remove rivet contact System of Detecting Surface Defects For Material during, the following patent of the applicant's earlier application, such as:
China Patent Publication No. are as follows: CN106281223A, for quickly removing the abrasive material of soil for electrical contact upsetting burr and circle printing
And its preparation method and application
China Patent Publication No. are as follows: CN107378741A, surface treatment method, abrasive material and the abrasive material preparation side of soil for electrical contact
Method
The above method is applicable to remove flash removed using iron powder, removes flash removed and circle printing using triangular pyramid, removes defeathering using cylinder
Thorn, circle printing and reduction contact resistance.
But equipment used in the above method is commonly to polish, and be there is a problem of common:
(1) stain cannot be removed；
(2) it is polished using common grinding machine, precision is inadequate；
(3) it is easy to appear dead angle, grinding is not thorough.
Summary of the invention
The purpose of the invention is to overcome shortcoming and defect of the existing technology, and provide a kind of based on magnetic force polishing
The method for removing rivet type electrical contact surface defect, rivet type electrical contact surface defect mainly include burr, circle printing, stain, are somebody's turn to do
Method configuration is suitble to the polishing fluid of removal stain, is all adjusted according to each component content difference polishing fluid configuration in stain, every kind
The stain of content is removed using the polishing fluid of different component content, is achieved the purpose that stain maximizes removal, is utilized simultaneously
The distinctive magnetic line of force distribution of alternating magnetic field, generates powerful stable magnetic strength effect, carries out magnetic force steel needle and rivet work face complete
Orientation is fully ground with multi-angle, reaches the effect of rapidly removing except stain.
To achieve the above object, the technical scheme is that configuration polishing fluid, by rivet to be processed, magnetic force steel needle,
The polishing fluid and water are added in the grinding drum of magnetic force polishing, are started magnetic field, are thrown to the stain on rivet to be processed
Light grinding removal；
The polishing fluid includes following components, according to mass percentage:
Inorganic acid 10-15%, organic acid 5-10%, corrosion inhibiter 3-8%, remaining is water；
The corrosion inhibiter includes benzotriazole and methylbenzotriazole, this includes benzotriazole and methylbenzotriazole
Mass ratio are as follows: 1/4-2/3.
It includes including one of sulfuric acid, nitric acid and hydrochloric acid or multiple combinations that further setting, which is the inorganic acid,.
If further setting is iron content > 40wt% in stain, the component of the inorganic acid are as follows: sulfuric acid 10-20wt%,
Nitric acid 30-40wt%, hydrochloric acid 3-8wt%, remaining is water；If Cu constituent content > 40wt%, sulfuric acid 20-30wt%, nitre in stain
Sour 10-20wt%, hydrochloric acid 5-15wt%, remaining is water.
It includes one of oxalic acid, sulfonic acid, acetic acid or multiple combinations that further setting, which is the organic acid,.
If content of organics > 40wt% in stain, oxalic acid 20-30%, sulfonic acid 10-20%, acetic acid 5-10%, remaining is water；
If content of organics < 40wt% in stain, oxalic acid 10-20wt%, sulfonic acid 20-30wt%, acetic acid 5-10wt%, remaining is water.
Further setting be the magnetic force steel needle additive amount be 1-5 times of rivet quality to be processed, magnetic force steel needle it is straight
Diameter is 0.1-0.3mm, length 2-4mm.
Further setting is that the revolving speed of the positive and negative rotating excitation field is uniformly set as 150-180r/min, and frequency is unified
It is set as 30-60HZ, time unification is set as 3-5min.
After further setting is polishing grinding, takes out rivet and carry out drying and processing, 60-80 DEG C of drying temperature, dry
Time 3-5min.
Inorganic acid of the present invention, main function are inorganic matters in removal stain, and inorganic matter mainly includes iron in stain
Element, copper compound.Inorganic acid includes sulfuric acid, nitric acid and hydrochloric acid, is matched according to the difference of inorganic content in stain
Than if iron content > 40% in stain, sulfuric acid 10-20%, nitric acid 30-40%, hydrochloric acid 3-8%, remaining is water；If in stain
Cu constituent content > 40%, then sulfuric acid is 20-30%, nitric acid 10-20%, hydrochloric acid 5%-15%, remaining is water.
Organic acid main function of the present invention is organic matter in removal stain, using the similar principle that mixes of organic matter to having
Machine object is removed.Organic acid includes oxalic acid, sulfonic acid, acetic acid, is matched according to content of organics difference in stain, if stain
Middle content of organics > 40%, then oxalic acid 20-30%, sulfonic acid 10-20%, acetic acid 5-10%, remaining is water；If organic matter contains in stain
< 40% is measured, then oxalic acid 10-20%, sulfonic acid 20-30%, acetic acid 5-10%, remaining is water.
Corrosion inhibiter main function of the present invention is to prevent inorganic acid, organic acid to contact excessive corrosion, mainly includes
Benzotriazole and methylbenzotriazole.Benzotriazole main function is to prevent inorganic acid, organic acid from corroding to silver, methyl
Benzotriazole main function is to prevent inorganic acid, organic acid to copper corrosion, and benzotriazole ratio is 10-20%, methylbenzene a pair of horses going side by side
Triazole 30-40%, remaining is water.That is the mass ratio of benzotriazole and methylbenzotriazole are as follows: 1/4-2/3.
Aforementioned proportion can prevent excessive corrosion, and the efficiency of stain completely removed can be made to exist by practice examining
It is completed in 6-10 minutes, to improve service efficiency.
In addition, the diameter of magnetic force steel needle of the present invention determines polishing intensity, diameter is thicker, and polishing intensity is bigger,
But it is bigger to the extent of the destruction in rivet work face, cause working face uneven.Diameter is smaller, and polishing intensity is smaller, may
Polishing action is not had to stain, stain not can be removed.Therefore, according to repetition test, steel needle diameter is determined as 0.1-0.3mm.
The length of steel needle determines its polishing position, and length is longer, easier to polish to positions such as turning, dead angles,
But the longer intensity of length just reduces, and does not have polishing effect.Length is shorter, and some turnings, the polishing of dead angle position are not achieved.
Therefore, according to repetition test, steel needle length is determined as 2-4mm.
Passing through repetition test, it is determined that the diameter and length of steel needle, such steel needle can quickly remove rivet work face stain,
Work at the same time that face is smooth, not uneven phenomenon.
The present invention proposes a kind of method for polishing removal rivet type electric contact defect using magnetic force, especially to complex-shaped
Rivet can more play its effect.Another advantage of magnetic force polishing is not injure rivet surface, does not influence rivet sizes precision.
It allows rivet surface moment to become smooth clean and tidy, takes on an entirely new look.Suitable for pure Ag, AgSnO2, the rivets such as AgNi grinding and polishing.
Advantages of the present invention includes:
(1) analysis and research based on the applicant to stain main component find that it is inorganic matter and organic matter, therefore, this Shen
The polishing fluid of particular components is configured in technical solution please, main component is inorganic acid, organic acid and corrosion inhibiter, wherein
Inorganic acid mainly removes inorganic matter in stain, and organic acid mainly removes organic matter in stain, and corrosion inhibiter plays two kinds of acid to rivet
Working face silver and Copper substrate corrosion-resisting function.The configuration of polishing fluid is mainly for stain ingredient, according to each component content in stain
Different polishing fluid configurations are all adjusted, and the stain of every kind of content is removed using the polishing fluid of different component content, is reached
Stain maximizes the purpose of removal.
(2) for compared to traditional mechanical polisher, have the following problems in stain removal field: a. stain cannot
All removals, have residual in working face；B. polishing precision is inadequate, and rivet component is be easy to cause largely to lack；C. it is easy to appear
Dead angle, stain removal are not thorough.And the stain of the application removes new process, configuration polishing fluid can be chemically reacted with stain,
Chemical reaction rate is accelerated under steel needle effect, while playing the role of mechanical polishing, achievees the purpose that quickly to remove stain.Together
When, the advantage of magnetic force polishing can withdraw deposit, and rivet sizes precision controlling is accurate, and dead angle can polish, and rivet shines right one after polishing
Newly.
(3) contact resistance new process is reduced
Contact resistance is to consider one of most important physical parameter of soil for electrical contact material, contact resistance=bulk resistor+film resistance,
Wherein stain causes to directly affect to film resistance, and the bigger stain the more, and film resistance is bigger, and contact resistance is bigger.In general, drop
The method of low contact resistance is polished using common polishing machine, as it was noted above, this method not can be removed stain at all,
Contact resistance is caused to become larger, proposition of the invention can remove stain, substantially be a kind of to realize the reduction of contact resistance
Reduce the new process of contact resistance.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with embodiment to the present invention make into
One step it is described in detail.
Embodiment 1
It is to configure polishing fluid, inorganic acid 15wt% in the polishing fluid, organic acid in the embodiment of the present invention in the embodiment of the present invention
10wt%, corrosion inhibiter 8wt%, remaining is water, sequentially adds 2kg rivet to be processed into grinding drum, diameter 3mm, head thickness 0.5mm,
Sufficient diameter 1.5mm, foot length 1mm；Magnetic force steel needle 3kg, magnetic force steel needle direct 0.1mm, length 2mm is added；200ml polishing fluid is added；
4L water is added.
Dedicated magnetic force polissoir is set, which includes clockwise and anticlockwise motor, disk and grinding drum, electricity
Machine drives disc rotation by transmission shaft, and electromagnet is provided on disk, and grinding drum is located at the magnetic for above disk and being located at disk
Within the scope of the line of force.
The electromagnet of AC power supply is provided on the present embodiment magnetic field, during the polishing process, by potentiometer to electricity
Pressure is adjusted, to form the variable alternating magnetic field of magnetic line of force size, sets motor speed 150r/min, sets polishing time
3min, starting motor drive transmission shaft rotation, and disk rotates, electromagnetism of the magnetic force in rotation in grinding drum as transmission shaft rotates
Under the magnetic drive of iron, magnetic force steel needle carries out high speed rotation, and polishes to rivet.Polishing, which terminates taking-up rivet, is dried
Processing, 60 DEG C of drying temperature, drying time 3min, rivet work face stain can be removed all after drying.
In the rotate driving of disk, motor also carries out rotating and reverse alternating the present embodiment, is formed and is rotated and reverse
Magnetic field.Corrosion inhibiter described in the present embodiment includes that benzotriazole ratio is 10%, and methylbenzotriazole 30%, remaining is water.
Inorganic acid described in the present embodiment includes including sulfuric acid, nitric acid and three kinds of hydrochloric acid mixing.Wherein sulfuric acid 10-
20wt%, nitric acid 30-40wt%, hydrochloric acid 3-8wt%, remaining is water.Preferred proportion are as follows: sulfuric acid 12wt%, nitric acid 34wt%, hydrochloric acid
5wt%, remaining is water.
Organic acid described in the present embodiment includes oxalic acid 20-30%, sulfonic acid 10-20%, acetic acid 5-10%, remaining is water；It is excellent
Select ratio are as follows: oxalic acid 23%, sulfonic acid 12%, acetic acid 7%, remaining is water
Embodiment 2
In the embodiment of the present invention, to configure polishing fluid, inorganic acid 10% in the polishing fluid, organic acid 5%, corrosion inhibiter 3%, remaining is
Water, sequentially add 3kg spherical surface rivet to be processed into grinding drum, diameter 3mm, head thickness 0.5mm, sufficient diameter 1.5mm, foot length
1mm；The preferred 4kg of magnetic force steel needle 4kg-15kg(is added), magnetic force steel needle direct 0.3mm, length 4mm；300ml polishing fluid is added；
6L water is added.
Dedicated magnetic force polissoir is set, which includes clockwise and anticlockwise motor, disk and grinding drum, electricity
Machine drives disc rotation by transmission shaft, and electromagnet is arranged on disk, and grinding drum is located at the magnetic force for above disk and being located at disk
Within the scope of line.
The electromagnet of AC power supply is provided on the present embodiment magnetic field, during the polishing process, by potentiometer to electricity
Pressure is adjusted, to form the variable alternating magnetic field of magnetic line of force size, sets clockwise and anticlockwise motor revolving speed 180r/min, setting is thrown
5min between light time, starting motor drive transmission shaft rotation, and disk is rotated as transmission shaft rotates, so that generating alternation magnetic
The electromagnet high speed rotation of field, and then magnetic force steel needle in grinding drum is driven to polish rivet.Due to the two of clockwise and anticlockwise motor
A direction is rotated, so that alternating magnetic field conveniently can change, improves polishing effect, polishing terminates taking-up rivet and dried
Dry-cure, 80 DEG C of drying temperature, drying time 5min, rivet work face stain can be removed all after drying.
In the rotate driving of disk, motor also carries out rotating and reverse alternating the present embodiment.
Corrosion inhibiter described in the present embodiment includes that benzotriazole ratio is 20%, and methylbenzotriazole 30%, remaining is
Water.
Inorganic acid described in the present embodiment include sulfuric acid be 20-30wt%, nitric acid 10-20wt%, hydrochloric acid 5-15wt%,
Yu Weishui.It is preferred that are as follows: sulfuric acid 23wt%, nitric acid 120t%, hydrochloric acid 9wt%, remaining is water.
Organic acid described in the present embodiment includes oxalic acid 10-20%, sulfonic acid 20-30%, acetic acid 5-10%, remaining is water.It is excellent
Select ratio are as follows: oxalic acid 12%, sulfonic acid 23%, acetic acid 6%, remaining is water.
The present embodiment 2 is as a preferred embodiment.
This method configuration is suitble to the polishing fluid of removal stain to utilize the distinctive magnetic line of force distribution of rotating excitation field simultaneously, generates strong
The stable magnetic strength effect of strength carries out magnetic force steel needle with rivet work face comprehensive, is fully ground with multi-angle, reaches and quickly remove
The effect of removing stain.
Positive and negative rotating excitation field with the single magnetic field main distinction is positive and negative chooses to install rotational speed of magnetic field, frequency setting range, pass through
Magnetic force steel needle is realized in the variation of revolving speed, frequency and rivet type electrical contact is comprehensive, multi-angle grinding and polishing, is more advantageous to removal riveting
The defect of nail type electrical contact, especially stain, single magnetic field can only be polished directly along fixed-direction, fixed frequency, riveting
Nail type electrical contact is rotated along a fixed-direction under the influence of centrifugal force, and magnetic force steel needle may not be able to greatly be polished to rivet
The all sites of type electrical contact cause to polish halfway situation, and stain is difficult to whole removals.
The above disclosure is only the preferred embodiments of the present invention, cannot limit the right model of the present invention with this certainly
It encloses, therefore equivalent changes made in accordance with the claims of the present invention, is still within the scope of the present invention.
Claims (10)
1. a kind of method for polishing removal rivet type electrical contact surface defect based on magnetic force, it is characterised in that: rivet type electrical contact
Surface defect mainly includes burr, circle printing, stain, polishing fluid is configured, by rivet to be processed, magnetic force steel needle, the polishing fluid
It is added in grinding drum in alternating magnetic field with water, starts alternating magnetic field, driving magnetic force steel needle is rotated by alternating magnetic field and is existed
It is moved in grinding drum, to carry out polishing grinding removal to the stain on rivet to be processed；
The polishing fluid includes following components, according to mass percentage:
Inorganic acid 10-15%, organic acid 5-10%, corrosion inhibiter 3-8%, remaining is water；
The corrosion inhibiter includes benzotriazole and methylbenzotriazole, this includes benzotriazole and methylbenzotriazole
Mass ratio are as follows: 1/4-2/3.
2. a kind of method for polishing removal rivet type electrical contact surface defect based on magnetic force according to claim 1, special
Sign is: the mass ratio of the polishing fluid and water is 1:9.
3. a kind of method for polishing removal rivet type electrical contact surface defect based on magnetic force according to claim 1, special
Sign is: the inorganic acid includes including one of sulfuric acid, nitric acid and hydrochloric acid or multiple combinations.
4. a kind of method for polishing removal rivet type electrical contact surface defect based on magnetic force according to claim 2, special
Sign is: if iron content > 40wt% in stain, the component of the inorganic acid are as follows: sulfuric acid 10-20wt%, nitric acid 30-40wt%,
Hydrochloric acid 3-8wt%, remaining is water；If Cu constituent content > 40wt%, sulfuric acid 20-30wt%, nitric acid 10-20wt%, salt in stain
Sour 5-15wt%, remaining is water.
5. a kind of method for polishing removal rivet type electrical contact surface defect based on magnetic force according to claim 1, special
Sign is: the organic acid includes one of oxalic acid, sulfonic acid, acetic acid or multiple combinations.
6. a kind of method for polishing removal rivet type electrical contact surface defect based on magnetic force according to claim 4, special
Sign is: if content of organics > 40wt% in stain, oxalic acid 20-30%, sulfonic acid 10-20%, acetic acid 5-10%, remaining is water；If
Content of organics < 40wt% in stain, then oxalic acid 10-20wt%, sulfonic acid 20-30wt%, acetic acid 5-10wt%, remaining is water.
7. a kind of method for polishing removal rivet type electrical contact surface defect based on magnetic force according to claim 1, special
Sign is: the additive amount of the magnetic force steel needle is 1-5 times of rivet quality to be processed, and the diameter of magnetic force steel needle is 0.1-0.3mm,
Length is 2-4mm.
8. a kind of method for polishing removal rivet type electrical contact surface defect based on magnetic force according to claim 1, special
Sign is: magnetic field is alternating magnetic field, and magnetic line of force size and Orientation changes at any time, rotation speed is uniformly set as 150-180r/
Min, speed are uniformly set as 30-60HZ, and time unification is set as 3-5min.
9. a kind of method for polishing removal rivet type electrical contact surface defect based on magnetic force according to claim 1, special
Sign is: after polishing grinding, taking-up rivet progress drying and processing, and 60-80 DEG C of drying temperature, drying time 3-5min.
10. a kind of method for polishing removal rivet type electrical contact surface defect based on magnetic force according to claim 1, special
Sign is: benzotriazole ratio is 10-20%, methylbenzotriazole 30-40%, remaining is water.
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| CN109834519A (en) * | 2019-03-19 | 2019-06-04 | 西安铁路信号有限责任公司 | A kind of magnetic force polishing method of railway signal relay junction unit |
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| CN113059502A (en) * | 2021-03-10 | 2021-07-02 | 鑫精合激光科技发展（北京）有限公司 | Part surface treatment method |
| CN113699000A (en) * | 2021-08-24 | 2021-11-26 | 福达合金材料股份有限公司 | Cleaning agent for removing stains on surface of rivet electrical contact and application of cleaning agent |
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| CN109834519A (en) * | 2019-03-19 | 2019-06-04 | 西安铁路信号有限责任公司 | A kind of magnetic force polishing method of railway signal relay junction unit |
| CN112454013A (en) * | 2020-10-16 | 2021-03-09 | 陕西斯瑞新材料股份有限公司 | Auxiliary metal processing technology for CuCr contact surface treatment processing |
| 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 |
| CN112518434A (en) * | 2020-10-20 | 2021-03-19 | 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 |
| 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 |
| CN112756756A (en) * | 2020-12-26 | 2021-05-07 | 福达合金材料股份有限公司 | Method for improving oxidation and blackening problems of resistance welding of welding type contact element |
| CN113059502A (en) * | 2021-03-10 | 2021-07-02 | 鑫精合激光科技发展（北京）有限公司 | Part surface treatment method |
| CN113699000A (en) * | 2021-08-24 | 2021-11-26 | 福达合金材料股份有限公司 | Cleaning agent for removing stains on surface of rivet electrical contact and application of cleaning agent |
| CN114470411A (en) * | 2022-02-21 | 2022-05-13 | 李开雄 | Scrap-free needle tube and machining method thereof |
| CN115142065A (en) * | 2022-06-09 | 2022-10-04 | 宁波顺成电器有限公司 | Surface treatment method for reducing contact resistance of rivet type contact surface |
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