CN108517486B - A kind of piston ring carbo-nitriding surface treatment method using liquid phase arc discharge - Google Patents
A kind of piston ring carbo-nitriding surface treatment method using liquid phase arc discharge Download PDFInfo
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- CN108517486B CN108517486B CN201810757603.4A CN201810757603A CN108517486B CN 108517486 B CN108517486 B CN 108517486B CN 201810757603 A CN201810757603 A CN 201810757603A CN 108517486 B CN108517486 B CN 108517486B
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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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/40—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using liquids, e.g. salt baths, liquid suspensions
- C23C8/52—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using liquids, e.g. salt baths, liquid suspensions more than one element being applied in one step
- C23C8/54—Carbo-nitriding
- C23C8/56—Carbo-nitriding of ferrous surfaces
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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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/04—Treatment of selected surface areas, e.g. using masks
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- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
The invention discloses a kind of piston ring carbo-nitriding surface treatment methods using liquid phase arc discharge, this method is in the adjustable pressure vessel for being contained with special component and strength solution, it is anode by cathode, inert electrode material of piston ring to be processed, apply DC pulse voltage between the two poles of the earth, arc discharge is formed in solution and piston ring contact interface, so that solution ionization is generated carbon containing, Nitrogen ion plasma, combination reaction occurs with piston ring and spread to inside workpiece, realizes carbo-nitriding.Rough microcosmic moulding is moulded in piston ring surface using the pressure wave that plasma bubbles rupture generates.Production quantity and the critical rupture pressure of plasma bubbles are controlled by adjusting the pressure in container to improve the quality of surface treatment.This method good environmental adaptability, processing speed be fast, high production efficiency, at low cost and energy conservation and environmental protection, has the advantages that wear-resisting, corrosion resistance is strong, and greasy property is good, and fatigue strength is high using the piston ring that this method is handled.
Description
Technical field
The present invention relates to internal combustion engine and steel surface processing technology fields more particularly to a kind of using liquid phase arc discharge
Piston ring carbo-nitriding surface treatment method.
Background technique
Piston ring is the important spare part of internal combustion engine, and process of surface treatment is to the reliability of internal combustion engine, durability, economy
Property and environmental-protecting performance have important influence.Carrying out carbo-nitriding processing to piston ring face can be improved the wear-resisting of piston ring
Property, fatigue strength and corrosion resistance are to prolong its service life.Traditional carbo-nitriding processing generally require under the high temperature conditions into
Row, and the required processing time is long, and production efficiency is low, and energy consumption is relatively high.
Liquid phase arc discharge carbo-nitriding is a kind of novel steel surface processing technique, and the technology is by by inert material
It is contained in the container of special component and strength solution with workpiece merging to be processed, using inert material as anode, work to be processed
Part is cathode, applies voltage between the two poles of the earth, forms arc discharge on solution and workpiece contact interface to be processed, keeps solution electric
From generating carbon containing, Nitrogen ion plasma, combination reaction occurs with workpiece and being spread to inside workpiece, so that it is total to reach carbon nitrogen
The purpose of infiltration.The carbo-nitriding method of patent CN101691648A narration just belongs to this technology.The technology has processing speed
Fastly, the features such as high production efficiency, energy conservation and environmental protection, but during its implementation, plasma bubbles are ruptured to workpiece surface metal
The impact of melting zone will lead to workpiece surface and form rough microdeformation, and this microdeformation is in current existing technology
In do not control effectively.When carrying out surface carbo-nitriding processing to piston ring using this method, if this microdeformation
Amount is controlled in a certain range, then is able to ascend the oil storage performance of piston ring, improves the friction between piston ring and cylinder jacket
Movement reduces friction loss, improves the mechanical efficiency of internal combustion engine.And when this microdeformation amount cannot be effectively controlled,
It is then possible to that piston ring is enabled effectively not to be sealed cylinder.
Therefore, realizing has surface microscopic deflection in liquid phase arc discharge piston ring surface carbo-nitriding treatment process
Effect control, while guaranteeing quality layer, the microcosmic moulding of optimization piston ring outer diameter face improves the service performance of piston ring,
It is that liquid phase arc discharge surface carbo-nitriding is handled to this new technique to handle urgently to be resolved ask applied to piston ring surface
Topic.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of piston ring carbo-nitriding tables using liquid phase arc discharge
Surface treatment method, this method can be realized micro- to piston ring surface while piston ring surface forms good carbonitrided case
Effective control of deflection is seen, microcosmic moulding of the oil storage better performances without influencing piston ring packing performance is formed, to improve
The properties such as wearability, corrosion resistance, lubricity and the fatigue strength of piston ring.
In order to solve the above technical problems, the technical scheme is that a kind of piston ring carbon using liquid phase arc discharge
Nitrogen permeation surface treatment method, comprising steps of
1) reaction solution is prepared
Firstly, the solvent of 30-35 parts by weight is taken, in the carbon containing nitrogen organic for wherein dissolving 15-30 parts by weight, in 60-
Container is poured into after stirring 30-40s under 90r/min rate, then adds the solvent of 40-50 parts by weight that solvent is made to reach 70- into container
85 parts by weight are simultaneously uniformly mixed, and obtain the reaction solution of 100 required parts by weight；
2) workpiece pre-processes
Piston ring to be processed before carrying out arc discharge carbo-nitriding processing, with abrasive paper for metallograph polishing surface to granularity be
950-1050#, after acetone cleaning and wiped clean, leave from office terrace, aperture surface and end face coat high-temperature insulation on the piston ring
Paint, is put into container to Qi Ganhou and is handled；
3) piston ring arc discharge carbo-nitriding is surface-treated
Pretreated piston ring merging is contained in the adjustable pressure vessel of special component and strength solution, with to be processed
Piston ring be cathode, inert electrode material is anode, apply DC pulse voltage between the two poles of the earth, in solution and piston to be processed
Ring contact interface forms arc discharge, and solution ionization is made to generate carbon containing, Nitrogen ion plasma, and it is anti-that chemical combination occurs with piston ring
The diffusion of Ying Bingxiang inside workpiece, realizes carbo-nitriding；The pressure wave impact piston ring table generated using plasma bubbles rupture
The metal melting area in face makes piston ring outer diameter face form rough micro- hole deformation；During processing, by adjusting container
Interior pressure is improved to control the production quantity and fracture pressure of plasma bubbles with controlling piston ring outer diameter face Light deformation amount
The quality of surface treatment.
The solvent of reaction solution is tap water in the step 1) as a preferred technical solution, and carbon containing nitrogen organic is
Urea, tap water have certain conductive capability and resistivity, can better meet the condition for generating arc discharge, and price
It is cheap.The discharge product of urea after the reaction be nitrogen and carbon dioxide, environmental pollution is few, and the price of urea compared with
It is low, it is water-soluble fabulous.
Piston ring to be processed is after sizing, cleaning process without other in the step 2) as a preferred technical solution,
The piston ring of processing.
The step 3) handles piston ring arc discharge carbo-nitriding surface as a preferred technical solution,
Including direct current pulse power source 8,8 positive wire 3 of direct current pulse power source and cathode wire 4 are electrically connected adjustable pressure vessel 9, described
Positive wire 3 is electrically connected the inert electrode 10 in the adjustable pressure vessel 9, and the cathode wire 4 is electrically connected the adjustable pressure-volume
Piston ring 11 in device 9, the adjustable pressure vessel 9 are placed in cooling bath 12.
The exportable voltage range of direct current pulse power source 8 as a preferred technical solution: 0-1000V, current range: 0-
10A, duty ratio 0-100% are adjustable, and frequency 100-3000Hz is adjustable, and error is equal between output voltage and electric current and setting value
≤ 0.5%；Positive wire 3 and cathode wire 4 are strand copper wire to reduce pulse shape distortion, guarantee work quality；It is cooling
Slot 12, which is adopted, to be made from an insulative material, and length size is respectively 400mm, 300mm, 200mm, wall thickness 5mm, and water inlet is located at
Left side lower part, water outlet are located at right side top, water circular flow 10L/min.
When work, adjustable pressure vessel 9 is placed horizontally in cooling bath.
When device needs to work under conditions of pressure is less than 1bar, import/exhaust pipe 2 accesses vacuum pump, by vacuum pump
Swabbing action cooperates negative pressure required inside 1 realization device of pressure regulator valve.When device needs work under conditions of pressure is greater than 1bar
When making, import/exhaust pipe 2 accesses High Purity Nitrogen gas cylinder, the pressure required inside 1 realization device of pressure regulator valve with high-pressure nitrogen bottle.
The adjustable pressure vessel is visualization closed container as a preferred technical solution,.
The visualization closed container includes container body 7 as a preferred technical solution, is equipped at the top of the container body 7
Container cover 5 is equipped with rubber washer 6, is equipped with import/exhaust at the top of the container cover 5 between the container body 7 and container cover 5
Pipe 2, is equipped with pressure regulator valve 1 on the import/exhaust pipe 2, and the container body 7 is also electrically connected the anode through the container cover 5 and leads
Line 3 and cathode wire 4.
The pressure regulator valve 1 is Pneumatic adjustable air pressure regulator as a preferred technical solution, and pressure gage measuring range range is
0-1MPa, minimum scale 0.02MPa；The outer diameter of import/exhaust pipe 2 and 1 entry/exit stomata of pressure regulator valve and 5 venthole of container cover
Internal diameter matches, and selects stainless steel material, and pipe thickness is not less than 0.8mm, pressure regulator valve 1 and container cover 5 with described into/row
2 junction of tracheae need to be handled with being sealed；Positive wire 3 and cathode wire 4 and 5 junction of container cover need to be sealed and absolutely
Edge processing；The outer diameter of rubber washer 6 is 180mm, internal diameter 168-172mm, with a thickness of 2-3mm；Container body 7 is outer with container cover
Diameter is 180mm, and thinnest part wall thickness is not less than 3.2mm.
The visualization closed container range of regulation is 0-2bar as a preferred technical solution, can hold liquor capacity
Range is 2-3L.
The visualization closed container operating voltage range is 220-600V as a preferred technical solution, when processing
Between within the scope of 2-30min.
The principle of the present invention are as follows: under arc discharge environment, generate carbon containing, Nitrogen ion plasma using solution ionization
Body occurs combination reaction with piston ring and spreads to inside workpiece, forms iron carbon/nitrogen compound layer and carbonitrided case；It utilizes
Plasma bubbles rupture the percussion to piston ring surface metal melting area, are formed in piston ring outer diameter face rough
Microcosmic moulding；It is lived by adjusting the pressure in container to control production quantity and the fracture pressure of plasma bubbles with effective control
Plug ring outer diameter face surface Light deformation amount improves surface treatment quality.
The present invention has the utility model has the advantages that the present invention can carry out at room temperature, to working environment without particular/special requirement, row
Putting product is nitrogen and carbon dioxide, and environmental pollution is few, have good environmental adaptability, processing speed fast, high production efficiency,
The features such as at low cost and energy conservation and environmental protection, has oil storage performance good using the piston ring that this method is handled, and wearability and corrosion resistance are strong,
The advantages that greasy property is good, and fatigue strength is high.
By adopting the above-described technical solution, a kind of piston ring carbo-nitriding surface treatment side using liquid phase arc discharge
Method, comprising steps of 1) preparing reaction solution: firstly, taking the solvent of 30-35 parts by weight, wherein dissolving containing for 15-30 parts by weight
Carbon nitrogen organic pours into container after stirring 30-40s under 60-90r/min rate, then adds the molten of 40-50 parts by weight into container
Agent makes solvent reach 70-85 parts by weight and is uniformly mixed, and obtains the reaction solution of 100 required parts by weight；2) workpiece pre-processes:
Piston ring to be processed is 950- with abrasive paper for metallograph polishing surface to granularity before carrying out arc discharge carbo-nitriding processing
1050#, after acetone cleaning and wiped clean, leave from office terrace, aperture surface and end face coat high-temperature insulating paint on the piston ring, to
Qi Ganhou is put into container and is handled；3) piston ring arc discharge carbo-nitriding is surface-treated: pretreated piston ring is set
In the adjustable pressure vessel for entering to be contained with special component and strength solution, using piston ring to be processed as cathode, inert electrode material
For anode, apply DC pulse voltage between the two poles of the earth, forms arc discharge in solution and piston ring contact interface to be processed, make molten
Liquid ionization generates carbon containing, Nitrogen ion plasma, and combination reaction occurs with piston ring and spreads to inside workpiece, realizes carbon nitrogen
Permeation；Using the metal melting area for the pressure wave impact piston ring surface that plasma bubbles rupture generates, make piston ring outer diameter
Face forms rough micro- hole deformation；During processing, plasma bubbles are controlled by adjusting the pressure in container
Production quantity and fracture pressure improve the quality of surface treatment to control piston ring outer diameter face Light deformation amount；When using this method
When being surface-treated to piston ring, piston ring merging is contained in the adjustable pressure vessel of special component and strength solution, with
Piston ring to be processed is cathode, inert electrode material is anode, applies DC pulse voltage between the two poles of the earth, solution with wait locate
It manages piston ring contact interface and forms arc discharge, so that solution ionization is generated carbon containing, Nitrogen ion plasma, occur with piston ring
Combination reaction is simultaneously spread to inside workpiece, realizes carbo-nitriding.The pressure wave impact generated using plasma bubbles rupture is living
The metal melting area on plug ring surface makes piston ring outer diameter face form rough micro- hole, and to reach, to mould piston ring surface micro-
See the purpose of moulding.During processing, the production quantity of plasma bubbles is controlled by adjusting the pressure in container and is broken
Split pressure is to improve the quality of surface treatment.This method has that good environmental adaptability, processing speed be fast, high production efficiency, cost
The features such as low and energy conservation and environmental protection, have that wear-resisting, corrosion resistance is strong using the piston ring that this method is handled, greasy property is good, and fatigue is strong
Spend the advantages that high.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention without any creative labor, may be used also for those of ordinary skill in the art
To obtain other drawings based on these drawings.
Fig. 1 is the structural schematic diagram of adjustable pressure vessel；
Fig. 2 is the device of the invention schematic diagram；
Fig. 3 is the scanning electron microscope image in the piston ring section after the method for the present invention is handled；
Fig. 4 is the scanning electron microscope image of the piston ring outer diameter face after the method for the present invention is handled.
Piston ring sample shown in Fig. 3 and Fig. 4 be in the urea liquid of mass concentration 20%, under 0.8bar air pressure, constant pressure
360V is handled obtained by 5min.
In Fig. 1 and Fig. 2: 1- pressure regulator valve, 2- import/exhaust pipe, 3- positive wire, 4- cathode wire, 5- container cover, 6- rubber
Washer, 7- container body, 8- direct current pulse power source, 9- is adjustable pressure vessel, 10- inert electrode, 11- piston ring, 12- cooling bath.
Specific embodiment
As depicted in figs. 1 and 2, a kind of piston ring carbo-nitriding surface treatment method using liquid phase arc discharge, including
Step:
1) reaction solution is prepared
Firstly, the solvent of 30-35 parts by weight is taken, in the carbon containing nitrogen organic for wherein dissolving 15-30 parts by weight, in 60-
Container is poured into after stirring 30-40s under 90r/min rate, then adds the solvent of 40-50 parts by weight that solvent is made to reach 70- into container
85 parts by weight are simultaneously uniformly mixed, and obtain the reaction solution of 100 required parts by weight；
2) workpiece pre-processes
Piston ring to be processed before carrying out arc discharge carbo-nitriding processing, with abrasive paper for metallograph polishing surface to granularity be
950-1050#, after acetone cleaning and wiped clean, leave from office terrace, aperture surface and end face coat high-temperature insulation on the piston ring
Paint, is put into container to Qi Ganhou and is handled；
3) piston ring arc discharge carbo-nitriding is surface-treated
Pretreated piston ring merging is contained in the adjustable pressure vessel of special component and strength solution, with to be processed
Piston ring be cathode, inert electrode material is anode, apply DC pulse voltage between the two poles of the earth, in solution and piston to be processed
Ring contact interface forms arc discharge, and solution ionization is made to generate carbon containing, Nitrogen ion plasma, and it is anti-that chemical combination occurs with piston ring
The diffusion of Ying Bingxiang inside workpiece, realizes carbo-nitriding；The pressure wave impact piston ring table generated using plasma bubbles rupture
The metal melting area in face makes piston ring outer diameter face form rough micro- hole deformation；During processing, by adjusting container
Interior pressure is improved to control the production quantity and fracture pressure of plasma bubbles with controlling piston ring outer diameter face Light deformation amount
The quality of surface treatment.
The solvent of reaction solution is tap water in the step 1), and carbon containing nitrogen organic is urea, and tap water has certain
Conductive capability and resistivity, the condition for generating arc discharge can be better meet, and it is cheap.Urea is after the reaction
Discharging product is nitrogen and carbon dioxide, and environmental pollution is few, and the price of urea is lower, water-soluble fabulous.
Piston ring to be processed is the piston ring without other processing after sizing, cleaning process in the step 2).
The surface processing device of the step 3) includes direct current pulse power source 8,8 positive wire 3 of direct current pulse power source
It is electrically connected adjustable pressure vessel 9 with cathode wire 4, the positive wire 3 is electrically connected the inert electrode in the adjustable pressure vessel 9
10, the cathode wire 4 is electrically connected the piston ring 11 in the adjustable pressure vessel 9, and the adjustable pressure vessel 9 is placed on cooling bath
In 12.
The exportable voltage range of direct current pulse power source 8: 0-1000V, current range: 0-10A, duty ratio 0-100% is adjustable
Section, frequency 100-3000Hz are adjustable, and error is ≤0.5% between output voltage and electric current and setting value；Positive wire 3 and yin
Polar conductor 4 is strand copper wire to reduce pulse shape distortion, guarantees work quality；Cooling bath 12, which is adopted, to be made from an insulative material,
Length size is respectively 400mm, 300mm, 200mm, wall thickness 5mm, and water inlet is located at left side lower part, and water outlet is located at
Right side top, water circular flow 10L/min.
When work, adjustable pressure vessel 9 is placed horizontally in cooling bath.
When device needs to work under conditions of pressure is less than 1bar, import/exhaust pipe 2 accesses vacuum pump, by vacuum pump
Swabbing action cooperates negative pressure required inside 1 realization device of pressure regulator valve.When device needs work under conditions of pressure is greater than 1bar
When making, import/exhaust pipe 2 accesses High Purity Nitrogen gas cylinder, the pressure required inside 1 realization device of pressure regulator valve with high-pressure nitrogen bottle.
The adjustable pressure vessel is visualization closed container.
The visualization closed container includes container body 7, and container cover 5, the container body 7 are equipped at the top of the container body 7
Rubber washer 6 is installed between container cover 5, import/exhaust pipe 2 is installed at the top of the container cover 5, on the import/exhaust pipe 2
Pressure regulator valve 1 is installed, the container body 7 is also electrically connected positive wire 3 and cathode wire 4 through the container cover 5.
The pressure regulator valve 1 is Pneumatic adjustable air pressure regulator, and pressure gage measuring range range is 0-1MPa, and minimum scale is
0.02MPa；The outer diameter of import/exhaust pipe 2 and the internal diameter of 1 entry/exit stomata of pressure regulator valve and 5 venthole of container cover match, choosing
With stainless steel material, pipe thickness, which is not less than 0.8mm, pressure regulator valve 1 and container cover 5 and 2 junction of pipeline, to be located with being sealed
Reason；Positive wire 3 and cathode wire 4 and 5 junction of container cover need to be sealed and insulation processing；The outer diameter of rubber washer 6 is
180mm, internal diameter 168-172mm, with a thickness of 2-3mm；Container body 7 and the outer diameter of container cover are 180mm, and thinnest part wall thickness is not low
In 3.2mm.
The visualization closed container range of regulation is 0-2bar, and can hold liquor capacity range is 2-3L.
The visualization closed container operating voltage range is 220-600V, handles the time within the scope of 2-30min.
Embodiment 1
The outer diameter face of the alloy cast iron piston ring obtained after sizing, cleaning process is polished on abrasive paper for metallograph first
To granularity be 1000#, then with acetone clean polishing after piston ring simultaneously wiped clean, later on the piston ring leave from office terrace,
Aperture surface and end face coat high-temperature insulating paint, be put into drying box at a temperature of 105 DEG C dry 3 hours it is spare.Take oneself of 1.5L
The urea of 500g is added in water, quickly pours into container after stirring to all dissolutions, then plus tap water to 2L and be uniformly mixed, obtain
To reaction solution.Preparation will be immersed in after pretreated piston ring and inert electrode are connected with cathode and anode conducting wire respectively
In good solution, power-up is depressed into 360V, and keeping the pressure in container is 0.8bar, handles 5min, thickness can be obtained up to 80 μm
Permeable formation, the micro- hole coverage rate of piston ring outer diameter face is about 62.9%, and micro- hole depth capacity is about 15 μm.
Embodiment 2
The outer diameter face of the alloy cast iron piston ring obtained after sizing, cleaning process is polished on abrasive paper for metallograph first
To granularity be 1000#, then with acetone clean polishing after piston ring simultaneously wiped clean, later on the piston ring leave from office terrace,
Aperture surface and end face coat high-temperature insulating paint, be put into drying box at a temperature of 105 DEG C dry 3 hours it is spare.Take oneself of 1.5L
The urea of 800g is added in water, quickly pours into container after stirring to all dissolutions, then plus tap water to 2L and be uniformly mixed, obtain
To reaction solution.Preparation will be immersed in after pretreated piston ring and inert electrode are connected with cathode and anode conducting wire respectively
In good solution, power-up is depressed into 400V, and keeping the pressure in container is 1bar, handles 10min, thickness can be obtained up to 120 μm
Permeable formation, the micro- hole coverage rate of piston ring outer diameter face is about 51.6%, and micro- hole depth capacity is about 20 μm.
Embodiment 3
The outer diameter face of the alloy cast iron piston ring obtained after sizing, cleaning process is polished on abrasive paper for metallograph first
To granularity be 1000#, then with acetone clean polishing after piston ring simultaneously wiped clean, later on the piston ring leave from office terrace,
Aperture surface and end face coat high-temperature insulating paint, be put into drying box at a temperature of 105 DEG C dry 3 hours it is spare.Take oneself of 1.5L
The urea of 500g is added in water, quickly pours into container after stirring to all dissolutions, then plus tap water to 2L and be uniformly mixed, obtain
To reaction solution.Preparation will be immersed in after pretreated piston ring and inert electrode are connected with cathode and anode conducting wire respectively
In good solution, power-up is depressed into 420V, and keeping the pressure in container is 1.6bar, handles 5min, thickness can be obtained up to 100 μm
Permeable formation, the micro- hole coverage rate of piston ring outer diameter face is about 38.1%, and micro- hole depth capacity is about 25 μm.
The above shows and describes the basic principle, main features and advantages of the invention.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (10)
1. a kind of piston ring carbo-nitriding surface treatment method using liquid phase arc discharge, which is characterized in that comprising steps of
1) reaction solution is prepared
Firstly, the solvent of 30-35 parts by weight is taken, in the carbon containing nitrogen organic for wherein dissolving 15-30 parts by weight, in 60-90r/min
Container is poured into after stirring 30-40s under rate, then adds the solvent of 40-50 parts by weight that solvent is made to reach 70-85 parts by weight into container
And be uniformly mixed, obtain the reaction solution of 100 required parts by weight；
2) workpiece pre-processes
Piston ring to be processed is 950- with abrasive paper for metallograph polishing surface to granularity before carrying out arc discharge carbo-nitriding processing
1050#, after acetone cleaning and wiped clean, leave from office terrace, aperture surface and end face coat high-temperature insulating paint on the piston ring, to
Qi Ganhou is put into container and is handled；
3) piston ring arc discharge carbo-nitriding is surface-treated
Pretreated piston ring merging is contained in the adjustable pressure vessel of special component and strength solution, with work to be processed
Plug ring is cathode, inert electrode material is anode, applies DC pulse voltage between the two poles of the earth, is connect in solution and piston ring to be processed
It touches interface and forms arc discharge, solution ionization is made to generate carbon containing, Nitrogen ion plasma, combination reaction occurs simultaneously with piston ring
It is spread to inside workpiece, realizes carbo-nitriding；The pressure wave impact piston ring surface generated is ruptured using plasma bubbles
Metal melting area makes piston ring outer diameter face form rough micro- hole deformation；During processing, by adjusting in container
Pressure improves surface to control the production quantity and fracture pressure of plasma bubbles to control piston ring outer diameter face Light deformation amount
The quality of processing.
2. using the piston ring carbo-nitriding surface treatment method of liquid phase arc discharge as described in claim 1, feature exists
In: the solvent of reaction solution is tap water in the step 1), and carbon containing nitrogen organic is urea.
3. using the piston ring carbo-nitriding surface treatment method of liquid phase arc discharge as described in claim 1, feature exists
In: piston ring to be processed is the piston ring without other processing after sizing, cleaning process in the step 2).
4. using the piston ring carbo-nitriding surface treatment method of liquid phase arc discharge as described in claim 1, feature exists
In: the device of the step 3) handled piston ring arc discharge carbo-nitriding surface includes direct current pulse power source 8, institute
It states 8 positive wire 3 of direct current pulse power source and cathode wire 4 is electrically connected adjustable pressure vessel 9, the positive wire 3 is electrically connected described
Inert electrode 10 in adjustable pressure vessel 9, the cathode wire 4 is electrically connected the piston ring 11 in the adjustable pressure vessel 9, described
Adjustable pressure vessel 9 is placed in cooling bath 12.
5. using the piston ring carbo-nitriding surface treatment method of liquid phase arc discharge as claimed in claim 4, feature exists
In: the exportable voltage range of direct current pulse power source 8: 0-1000V, current range: 0-10A, duty ratio 0-100% are adjustable, frequency
Rate 100-3000Hz is adjustable, and error is ≤0.5% between output voltage and electric current and setting value；Positive wire 3 is led with cathode
Line 4 is strand copper wire to reduce pulse shape distortion, guarantees work quality；Cooling bath 12, which is adopted, to be made from an insulative material, long,
Wide, high size is respectively 400mm, 300mm, 200mm, wall thickness 5mm, and water inlet is located at left side lower part, and water outlet is located at the right side
Side surface upper part, water circular flow 10L/min.
6. using the piston ring carbo-nitriding surface treatment method of liquid phase arc discharge as claimed in claim 4, feature exists
In: the adjustable pressure vessel is visualization closed container.
7. using the piston ring carbo-nitriding surface treatment method of liquid phase arc discharge as claimed in claim 6, feature exists
In: the visualization closed container includes container body 7, and container cover 5, the container body 7 and container are equipped at the top of the container body 7
Rubber washer 6 is installed between lid 5, import/exhaust pipe 2 is installed at the top of the container cover 5, is equipped on the import/exhaust pipe 2
Pressure regulator valve 1, the container body 7 are also electrically connected positive wire 3 and cathode wire 4 through the container cover 5.
8. using the piston ring carbo-nitriding surface treatment method of liquid phase arc discharge as claimed in claim 7, feature exists
In: the pressure regulator valve 1 is Pneumatic adjustable air pressure regulator, and pressure gage measuring range range is 0-1MPa, and minimum scale is
0.02MPa；The outer diameter of import/exhaust pipe 2 and the internal diameter of 1 entry/exit stomata of pressure regulator valve and 5 venthole of container cover match, choosing
With stainless steel material, pipe thickness be not less than 0.8mm, pressure regulator valve 1 and container cover 5 and 2 junction of import/exhaust pipe need into
Row encapsulation process；Positive wire 3 and cathode wire 4 and 5 junction of container cover need to be sealed and insulation processing；Rubber washer 6
Outer diameter be 180mm, internal diameter 168-172mm, with a thickness of 2-3mm；Container body 7 and the outer diameter of container cover are 180mm, thinnest part
Wall thickness is not less than 3.2mm.
9. using the piston ring carbo-nitriding surface treatment method of liquid phase arc discharge as claimed in claim 6, feature exists
In: the visualization closed container range of regulation is 0-2bar, and can hold liquor capacity range is 2-3L.
10. using the piston ring carbo-nitriding surface treatment method of liquid phase arc discharge as claimed in claim 6, feature exists
In: the visualization closed container operating voltage range is 220-600V, handles the time within the scope of 2-30min.
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