CN110625206A - Method for machining micro oil storage cavity on surface of piston ring - Google Patents
Method for machining micro oil storage cavity on surface of piston ring Download PDFInfo
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- CN110625206A CN110625206A CN201910943530.2A CN201910943530A CN110625206A CN 110625206 A CN110625206 A CN 110625206A CN 201910943530 A CN201910943530 A CN 201910943530A CN 110625206 A CN110625206 A CN 110625206A
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- piston ring
- oil storage
- arc discharge
- plasma
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H1/00—Electrical discharge machining, i.e. removing metal with a series of rapidly recurring electrical discharges between an electrode and a workpiece in the presence of a fluid dielectric
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H1/00—Electrical discharge machining, i.e. removing metal with a series of rapidly recurring electrical discharges between an electrode and a workpiece in the presence of a fluid dielectric
- B23H1/08—Working media
Abstract
The invention relates to the technical field of automobile engines and metal surface treatment, in particular to a surface treatment technology of a piston ring of an automobile engine, and particularly relates to a machining method of a micro oil storage cavity on the surface of the piston ring. When the method is adopted to process the surface of the piston ring, the piston ring to be processed is taken as a cathode and is horizontally placed into a liquid-phase plasma arc discharge system containing specific processing liquid, arc discharge is formed on the surface of the piston ring, and plasma with high temperature of more than 8000K generated when a plasma film layer is punctured by the arc discharge effect impacts and ablates a piston ring matrix under the action of a strong electric field to form an oil storage micro-cavity. By adopting the method of the invention, the diameter of the cavity opening on the surface of the piston ring can be 0.5-5 mu m, and the volume is 2 multiplied by 10‑7‑1×10‑6The micro oil storage micro cavity can obviously improve the lubricating performance of the piston ring.
Description
Technical Field
The invention relates to the technical field of automobile engines and metal surface treatment, in particular to a surface treatment technology of a piston ring of an automobile engine, and particularly relates to a machining method of a micro oil storage cavity on the surface of the piston ring.
Background
The piston ring is one of the most critical parts of the vehicle engine, and plays important roles of sealing, oil control, heat conduction, support and the like in the operation process of the engine. The piston ring has complex motion conditions, not only has high-speed and high-frequency reciprocating motion, but also has violent vibration in the ring groove, has severe working environment, needs to bear the erosion of thermal stress, high explosion pressure and high-temperature and high-pressure gas, and puts a very high requirement on the wear resistance of the piston ring. In recent years, with the continuous development of vehicle engines towards high power density, high rotating speed, low fuel consumption, low harmful emission and the like, higher requirements are provided for the performances of the piston ring such as thermal fatigue strength, high-temperature corrosion resistance, high-temperature wear resistance and the like, and the friction pair of the piston ring and the cylinder sleeve also faces more and more serious lubricating and wear reducing challenges.
The laser surface micro-molding technology is a commonly used means for improving the lubrication condition of a piston ring-cylinder sleeve friction pair and improving the wear resistance of a piston ring by carrying out micro-molding on the surface of the piston ring. The methods described in Chinese patent CN101380692 and Chinese patent CN1857844 are of this type. The laser surface micro-modeling technology has the advantages of high processing speed, small heat affected zone, small thermal deformation of workpieces, small subsequent processing amount and the like, but laser processing equipment is high in price and difficult to maintain, and a high threshold is set for researchers and manufacturers. The micro-arc reconstruction technology for the metal surface is a novel surface treatment technology, and the technology generates rugged micro-modeling on the metal surface through micro-arc discharge generated on the interface of a processed workpiece and treatment liquid, so that the reconstruction treatment of the metal surface is realized. The technology described in chinese patent 101824640a is simple, convenient, feasible, low in production cost, high in production efficiency, energy-saving and environment-friendly, but the technology is only limited to the reconstruction of metal surface by changing the surface roughness of metal workpiece and forming rugged micro-modeling on the workpiece surface, and is not suitable for piston ring-cylinder liner friction pair with extremely high requirements on sealing performance and lubricating performance. Therefore, it is necessary to develop a surface micro-molding processing technology which is simple, convenient and easy to control, has small equipment investment, high production efficiency, energy conservation and environmental protection and is suitable for the piston ring of the vehicle engine with high power density and high rotating speed.
Disclosure of Invention
The invention aims to provide a method for processing a micro oil storage cavity on the surface of a piston ring by adopting liquid-phase plasma arc discharge, which can process an oil storage micro cavity on the surface of the piston ring under the condition of not influencing the sealing performance of the piston ring, thereby improving the oil storage performance of the piston ring and improving the lubricating condition of a piston ring-cylinder sleeve friction pair.
In order to achieve the technical goals, the invention adopts the following specific technical scheme:
a method for processing a micro oil storage cavity on the surface of a piston ring by adopting liquid-phase plasma arc discharge is characterized by comprising the following steps of:
the method comprises the following steps: preparing a treatment solution. The treatment fluid prepared by the invention consists of formamide and NH4And (4) Cl solution.
Step two: and (4) preprocessing a workpiece. And (3) polishing the outer circular surface of the piston ring to be treated to the granularity of 1500# by using metallographic abrasive paper, cleaning by using acetone, wiping, and drying in an oven for later use.
Step three: and (3) performing liquid-phase plasma arc discharge machining on the surface of the piston ring. The piston ring after pretreatment is horizontally placed into a stainless steel container containing treatment liquid, the piston ring to be treated is used as a cathode, the stainless steel container is used as an anode, high-frequency pulse voltage is applied, after an air film on the surface of the piston ring is punctured, the voltage is continuously increased until the piston ring forms arc discharge on the interface of the treatment liquid, active atoms in the treatment liquid are ionized to form plasma and wrap the surface of the piston ring, the plasma with high temperature of more than 8000K generated when the arc discharge breaks through a plasma film layer is used for striking the surface of the piston ring under the action of a strong electric field and leaving ablation traces, the ablation traces are oil storage micro-cavities, after the arc discharge phenomenon lasts for a period of time, a power supply is closed, the piston ring is taken out, cleaned by acetone and dried.
In the first step, the treatment liquid is prepared from formamide and NH4And (4) Cl solution. The volume percentage of each component is as follows: 75-80% of formamide and NH420-25% of Cl solution. Wherein NH4Cl solution from NH4Cl and deionized water, NH4The mass concentration of Cl is 5-10%. The treatment liquid used in the invention needs to be subjected to ultrasonic oscillation for more than 5min before use so as to realize uniform mixing.
In the second step, the piston ring to be treated is a piston ring which is shaped and cleaned without other treatments.
In the third step, when the piston ring is treated by the method, the piston ring needs to be horizontally placed in a stainless steel container. The working voltage range of the piston ring to be treated during liquid-phase plasma arc discharge processing is the plasma film layer breakdown voltage plus 50V-100V, the power frequency is 500-2000Hz, the duty ratio is 35% -50%, and the current density is 1.2A/cm2-1.8A/cm2(ii) a The duration time of the arc discharge phenomenon is within the range of 5-10 min.
In the third step, the diameter of the orifice of the oil storage micro-cavity formed after the plasma ablation is 0.5-5 μm, and the volume is 2 multiplied by 10-7-1×10-6μL。
The principle of the invention is as follows: the arc discharge is formed on the surface of the piston ring, active atoms in the treatment liquid are ionized to form plasma and wrap the plasma on the surface of the piston ring, the plasma with high temperature of more than 8000K generated when the plasma film is broken down by the arc discharge effect impacts the piston ring substrate under the action of a strong electric field, the piston ring substrate is melted after the plasma is ablated, and funnel-shaped ablation traces are left after the treatment liquid is cooled, wherein the ablation traces are oil storage micro cavities.
The invention has the following beneficial effects: the method has no special requirements on the working environment and has good environmental adaptability; the treatment liquid adopted by the invention is convenient to prepare and low in price. The invention adopts liquid-phase plasma arc discharge to process an oil storage micro-cavity on the surface of the piston ring to be treated. The piston ring processed by the method has good lubricating property, and can ensure lower oil consumption and emission while reducing the friction work of an engine. The method is simple, convenient and easy to control, convenient to implement, good in environmental adaptability, small in equipment investment, high in production efficiency, energy-saving and environment-friendly, and suitable for large-scale industrial production. The problems of difficult surface micro-molding processing, high threshold and the like of the piston ring of the vehicle engine are effectively solved.
Drawings
FIG. 1 is a schematic view of a liquid phase plasma discharge reaction apparatus used in the method of the present invention;
in the figure 1, a stirrer, 2, a high-frequency pulse power supply, 3, a piston ring, 4, a water pump, 5, a stainless steel container, 6, an insulating pad and 7, a cooling water jacket.
Fig. 2 and 3 are cross-sections of the oil storage micro-cavity.
Detailed Description
The technical solution of the present invention is further described in detail with reference to the following specific examples.
The structure of the device for realizing the invention is schematically shown in figure 1, and mainly comprises a stirrer 1 and a high-frequency pulse power supply; 2, a piston ring 3 and a water pump 4; a stainless steel container 5; an insulating pad 6 and a cooling water jacket 7.
The high-frequency pulse power supply 2 can output a voltage range: 0-1000V, working current range: 0-10A, the duty ratio is 0-100 percent and can be adjusted, the power frequency is 100 and 3000Hz and can be adjusted, and the errors between the output voltage and the current and the set value are less than or equal to 0.5 percent; the power of the water pump 4 is 5W, and the circulating flow of the cooling water is 5L/min.
The section of the oil storage micro-cavity on the surface of the piston ring processed by the method of the invention is shown in figures 2 and 3.
Example 1
Firstly, the outer diameter surface of the piston ring obtained after the shaping and cleaning processes is polished on metallographic abrasive paper until the granularity is 1500#, and then the polished piston ring is cleaned by acetone and dried for later use. Adding 10g of ammonium chloride into 100ml of deionized water, uniformly stirring, adding 400ml of formamide, quickly stirring, pouring into an ultrasonic oscillator, oscillating for 5min, and pouring into a stainless steel reaction container. Connecting the pretreated piston ring and a stainless steel reaction container with a cathode lead and an anode lead respectively, horizontally placing the piston ring in the stainless steel reaction container, applying a voltage to 130V, breaking down an air film, continuously applying a voltage to 190V, observing arc discharge formed on the surface of the piston ring, treating for 10min, taking out the piston ring after the power is turned off, cleaning with acetone, and drying to obtain the piston ring with a cavity opening diameter of 1-3 μm and a volume of 4 × 10-7-8×10-7Mu L unequal oil storage micro-cavities.
Example 2
Firstly, shaping,And (3) polishing the outer diameter surface of the piston ring obtained after the cleaning procedure on metallographic abrasive paper until the granularity is 1500#, cleaning the polished piston ring by using acetone, and drying for later use. Adding 5g of ammonium chloride into 100ml of deionized water, uniformly stirring, adding 400ml of formamide, quickly stirring, pouring into an ultrasonic oscillator, oscillating for 5min, and pouring into a stainless steel reaction container. Connecting the pretreated piston ring and a stainless steel reaction vessel with a cathode lead and an anode lead respectively, horizontally placing the piston ring in the stainless steel reaction vessel, applying a voltage to 180V, breaking down an air film, continuously applying a voltage to 240V, observing arc discharge formed on the surface of the piston ring, wherein the power frequency is 1000Hz, the duty ratio is 50%, treating for 10min, taking out the piston ring after closing the power, cleaning with acetone, and drying to obtain the piston ring with a cavity opening diameter of 2-5 μm and a volume of 5 × 10-7-1×10-6Mu L unequal oil storage micro-cavities.
Example 3
Firstly, the outer diameter surface of the piston ring obtained after the shaping and cleaning processes is polished on metallographic abrasive paper until the granularity is 1500#, and then the polished piston ring is cleaned by acetone and dried for later use. Adding 5g of ammonium chloride into 100ml of deionized water, uniformly stirring, adding 400ml of formamide, quickly stirring, pouring into an ultrasonic oscillator, oscillating for 5min, and pouring into a stainless steel reaction container. Connecting the pretreated piston ring and a stainless steel reaction container with a cathode lead and an anode lead respectively, horizontally placing the piston ring in the stainless steel reaction container, applying a voltage to 180V, then breaking down an air film, continuously applying a voltage to 240V, observing arc discharge formed on the surface of the piston ring, wherein the power frequency is 2000Hz, the duty ratio is 35%, treating for 10min, taking out the piston ring after closing the power, cleaning with acetone, and drying to obtain the piston ring with a cavity opening of 0.5-2 μm in diameter and 2 x 10 in volume-7-5×10-7Mu L unequal oil storage micro-cavities.
Claims (5)
1. A method for processing a micro oil storage cavity on the surface of a piston ring is characterized in that the micro oil storage cavity is processed on the surface of the piston ring by adopting liquid phase plasma arc discharge, and the method comprises the following specific steps:
the method comprises the following steps: preparing a treatment solution; the treating fluid consists of formamide and NH4Cl solution;
step two: workpiece pretreatment: polishing the outer circle surface of the piston ring to be processed by using metallographic abrasive paper, cleaning and wiping the piston ring by using acetone, and then putting the piston ring into a drying oven for drying for later use;
step three: liquid phase plasma arc discharge machining of the surface of the piston ring: placing the pretreated piston ring in a stainless steel container containing treatment liquid, applying high-frequency pulse voltage by taking the piston ring to be treated as a cathode and the stainless steel container as an anode, continuously increasing the voltage after an air film on the surface of the piston ring is broken down until the piston ring forms arc discharge on a treatment liquid interface, ionizing active atoms in the treatment liquid to form plasma and wrapping the plasma on the surface of the piston ring, and striking the surface of the piston ring by plasma with high temperature of more than 8000K generated when the plasma film is broken down by the arc discharge under the action of a strong electric field to leave an ablation trace, wherein the ablation trace is an oil storage micro-cavity; and (4) after the arc discharge phenomenon lasts for a period of time, turning off the power supply, taking out the piston ring, cleaning the piston ring with acetone, and drying the piston ring.
2. The method for machining the micro oil storage cavity on the surface of the piston ring as claimed in claim 1, wherein in the first step, the volume percentages of the components of the treatment fluid are as follows: 75-80% of formamide and NH420% -25% of Cl solution; wherein the NH4Cl solution is prepared from NH4Cl and deionized water, NH4The mass concentration of Cl is 5-10%; the used treatment liquid needs to be subjected to ultrasonic oscillation for more than 5min before use so as to realize uniform mixing.
3. The method for machining the micro oil storage cavity on the surface of the piston ring as claimed in claim 1, wherein in the second step, the outer circumferential surface of the piston ring to be treated is polished to a granularity of 1500# by using metallographic abrasive paper.
4. The method of claim 1, wherein in step three, the piston ring is placed horizontallyIn a stainless steel container; the working voltage range of the piston ring to be treated during liquid-phase plasma arc discharge processing is the plasma film layer breakdown voltage plus 50V-100V, the power frequency is 500-2000Hz, the duty ratio is 35% -50%, and the current density is 1.2A/cm2-1.8A/cm2(ii) a The duration time of the arc discharge phenomenon is within the range of 5-10 min.
5. The method as claimed in claim 1, wherein the diameter of the oil storage micro-cavity formed by plasma ablation is 0.5-5 μm, and the volume is 2 x 10-7-1×10-6μL。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910943530.2A CN110625206A (en) | 2019-09-30 | 2019-09-30 | Method for machining micro oil storage cavity on surface of piston ring |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910943530.2A CN110625206A (en) | 2019-09-30 | 2019-09-30 | Method for machining micro oil storage cavity on surface of piston ring |
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| CN110625206A true CN110625206A (en) | 2019-12-31 |
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| CN201910943530.2A Withdrawn CN110625206A (en) | 2019-09-30 | 2019-09-30 | Method for machining micro oil storage cavity on surface of piston ring |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0829553A1 (en) * | 1996-09-13 | 1998-03-18 | Fraunhofer-Gesellschaft Zur Förderung Der Angewandten Forschung E.V. | Method and apparatus for modifying surfaces of metallic workpieces by electrical discharges |
| JP3609429B2 (en) * | 1998-05-13 | 2005-01-12 | 三菱電機株式会社 | Compressed powder electrode for discharge surface treatment and method for producing the same, discharge surface treatment method and apparatus, and method for recycling powder electrode for discharge surface treatment |
| CN1876890A (en) * | 2006-06-30 | 2006-12-13 | 大连海事大学 | Plasma piston ring surface strengthening and toughening treatment method |
| CN101824640A (en) * | 2010-05-14 | 2010-09-08 | 河海大学常州校区 | Reconstructing method of micro arc of metal surface |
| CN102226289A (en) * | 2011-06-14 | 2011-10-26 | 淮海工学院 | Liquid phase plasma enhanced nano composite coating apparatus and its application method |
| CN104018201A (en) * | 2013-02-28 | 2014-09-03 | 北京师范大学 | Solution and method for rapid cathode micro-arc oxidation treatment on steel surface |
| CN107636367A (en) * | 2015-07-17 | 2018-01-26 | 株式会社理研 | Piston ring and its manufacture method |
| CN108517486A (en) * | 2018-07-11 | 2018-09-11 | 江苏苏扬包装股份有限公司 | A kind of piston ring carbo-nitriding surface treatment method using liquid phase arc discharge |
-
2019
- 2019-09-30 CN CN201910943530.2A patent/CN110625206A/en not_active Withdrawn
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0829553A1 (en) * | 1996-09-13 | 1998-03-18 | Fraunhofer-Gesellschaft Zur Förderung Der Angewandten Forschung E.V. | Method and apparatus for modifying surfaces of metallic workpieces by electrical discharges |
| JP3609429B2 (en) * | 1998-05-13 | 2005-01-12 | 三菱電機株式会社 | Compressed powder electrode for discharge surface treatment and method for producing the same, discharge surface treatment method and apparatus, and method for recycling powder electrode for discharge surface treatment |
| CN1876890A (en) * | 2006-06-30 | 2006-12-13 | 大连海事大学 | Plasma piston ring surface strengthening and toughening treatment method |
| CN101824640A (en) * | 2010-05-14 | 2010-09-08 | 河海大学常州校区 | Reconstructing method of micro arc of metal surface |
| CN102226289A (en) * | 2011-06-14 | 2011-10-26 | 淮海工学院 | Liquid phase plasma enhanced nano composite coating apparatus and its application method |
| CN104018201A (en) * | 2013-02-28 | 2014-09-03 | 北京师范大学 | Solution and method for rapid cathode micro-arc oxidation treatment on steel surface |
| CN107636367A (en) * | 2015-07-17 | 2018-01-26 | 株式会社理研 | Piston ring and its manufacture method |
| CN108517486A (en) * | 2018-07-11 | 2018-09-11 | 江苏苏扬包装股份有限公司 | A kind of piston ring carbo-nitriding surface treatment method using liquid phase arc discharge |
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Application publication date: 20191231 |