CN102492804B - Nanometer strengthening method of surface of long thin piston rod of hydraulic oil cylinder - Google Patents
Nanometer strengthening method of surface of long thin piston rod of hydraulic oil cylinder Download PDFInfo
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- CN102492804B CN102492804B CN 201110410609 CN201110410609A CN102492804B CN 102492804 B CN102492804 B CN 102492804B CN 201110410609 CN201110410609 CN 201110410609 CN 201110410609 A CN201110410609 A CN 201110410609A CN 102492804 B CN102492804 B CN 102492804B
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Abstract
The invention discloses a nanometer strengthening method of the surface of a long thin piston rod of a hydraulic oil cylinder, which belongs to the technical field of surface engineering and includes conducting half finish turning on the long thin piston rod by utilizing an ultrasound nanometer strengthening system, conducting finish turning after the half finish turning, retaining ultrasonic processing quantity according to difference of machine parts, opening an oil spraying pipe, setting spindle rotating speed and knife frame feeding speed of a horizontal type lathe according to the diameter of the long thin piston rod and opening an ultrasound nanometer strengthening device to conduct ultrasound nanometer strengthening processing. The strengthening method utilizes cold plasticity of the surface of the piston rod in the normal temperature state and utilizes composite energy of mechanical energy generated by high frequency vibration of rolling balls and heat energy with the temperature slightly higher than room temperature to conduct grinding-agent-free grinding, strengthening and tiny transformation processing on the surface of the piston rod to enable the surface of the piston rod to achieve better surface roughness and refine grains of surface metal. Simultaneously, pressure stress is generated on the surface, surface micro-hardness is improved, abrasion resistance is strengthened, and fatigue service life is prolonged.
Description
Technical field
The present invention relates to a kind of nanometer strengthening method of surface of long thin piston rod of hydraulic oil cylinder, belong to field of surface engineering technique.Can be applicable to mechanical manufacturing field.
Background technology
Along with the progress of science and technology, each field requires also more and more extensive to the type of hydro-cylinder.Therefore, the reinforcement modification of cylinder device internal friction secondary surface becomes the problem of a growing interest thus.Surface strengthening is a kind of processing method of improving mechanical component and component surface performance, improving fatigue strength and wear resisting property, sometimes can also improve corrosion resistance nature.
In surface strengthening technology, as the enhancement method of mechanical system, mainly adopt now cold rolling and shot-peening dual mode.But being applied in of cold rolling or ball blasting method technically also is subject to certain restrictions.Be only applicable to rotary type, the hardness part below 40HRC as the roll extrusion technology.And owing to being pressurised into the static load form, larger for reaching the required pressure of a certain amount of distortion in rolling; And blasting technology is generally used for the not too high part of surface quality requirement.
For hydraulic cylinder piston rod, the mode of its surface strengthening at present is mainly to realize by the mode of quenching.And for elongate plunger rod, thermal treatment can make part deformation usually, changes its size and dimension precision.
Summary of the invention
The invention provides a kind of nano reinforcement method of hydraulic ram elongated piston rod outer surface, with its processing slim piston rod outside surface, the surface microstructure that obtains is little, and is highly polished, wear resistance good, can play the effect that the refinement of metal grain is strengthened; Further improve its anti-wear and wear-resistant performance, increase the work-ing life of hydro-cylinder.
Principle of the present invention is to utilize the cold plasticity characteristics of piston rod surface under the normal temperature state, use mechanical energy and the temperature that the ball high-frequency vibration produces a little more than the energy composite energy of the heat energy of room temperature, grinding, reinforcement and miniature deformation that piston rod surface carries out abrasive-free to be processed, make piston rod surface reach better surfaceness, the crystal grain of refinement surface metal, produce simultaneously stress on the surface, improve surface microhardness, strengthen its wear resistance and fatigue lifetime.
The present invention is achieved through the following technical solutions: a kind of nanometer strengthening method of surface of long thin piston rod of hydraulic oil cylinder, the ultrasonic nano consolidation system that uses is: comprise horizontal lathe, be arranged on the fixture, spray bar and the knife rest that are used for the elongate piston rod on horizontal lathe, the ultrasonic nano intensifying device; Described ultrasonic nano intensifying device comprises controller, ultrasonic generator, transverter, horn and the ball that connects successively; Transverter is connected with knife rest.
Concrete operation step is as follows:
1) the ultrasonic nano consolidation system is set up in installation, and controller, ultrasonic generator, transverter, horn, ball are connected and installed successively; Elongate plunger rod to be processed is arranged on fixture, and fixture, spray bar and knife rest are connected on horizontal lathe; Transverter is connected with knife rest;
2) debugging: the height that the axis of transverter, horn, ball linker is debugged with elongate plunger rod is consistent, and vertical with its axis; Adjusting ball makes it rotate flexibly, stablize starting of oscillation; The numerical value of each table of controller shows normal, and the ultrasonic vibration output state is: output rating 480W, output frequency 30KHz; Pulsation of machine tool main shaft is less than 0.03mm; During transverse feed, the gap of system is less than 0.05mm;
3) processing: elongate plunger rod is carried out half finish turning; The complete rear finish turning of half finish turning reserves the ultrasonic machining amount according to the difference of parts; Open spray bar, the speed of mainshaft and the knife rest speed of feed of horizontal lathe is set according to the diameter of elongate plunger rod, start ultrasonic wave module, carry out the ultrasonic nano intensive treatment; Need in the course of processing to guarantee: after the piston rod finish turning, roughness should be not more than HRC60 less than Ra6.3, surface hardness; Maximum line velocity is 80m/min; The lubricating oil of spray bar ejection is kerosene and the 20# machinery oil mixture of 1: 3;
4) machine after, unload elongate plunger rod, close ultrasonic nano consolidation system device.
In technique scheme, controller, ultrasonic generator, transverter, horn, ball form ultrasonic system.Controller is used for regulating the state of the hyperacoustic parameter of nano reinforcement process and Real Time Monitoring ultrasonic machining; Ultrasonic generator is in order to produce frequency at the 30KHz alternating voltage; Transverter converts the 30KHz alternating voltage to the mechanical vibration of 30KHz; Horn becomes the high-frequency vibration of little amplitude the high-frequency vibration of large amplitude; Ball passes to the elongate plunger rod surface with high-frequency vibration and carries out nano reinforcement.In the process of nano reinforcement, elongate plunger rod is by the lathe module drive; Transverter is connected with knife rest, can moving axially along elongate plunger rod.The lathe module is comprised of spray bar, elongate plunger rod, fixture, horizontal lathe and knife rest.In the process of nano reinforcement, spray bar injects lubricating oil between ball and piston rod, and piston rod is connected with horizontal lathe by fixture, makes elongate plunger rod according to the parameter rotation of setting under the driving of horizontal lathe.
After testing, the technical indicator after processing reaches: surface hardness raising 20%～100%, layer depth 0.1～0.2mm; Roughness is about Ra0.01～0.8.
The present invention has the following advantages:
1) the present invention is suitable for low rigidity part.When the ball high-frequency vibration, lean on mechanical energy and temperature to act on piece surface a little more than the heat energy of room temperature, rather than main depended on pressure, therefore when being processed, part can not cause the distortion of part because of the effect of mechanical pressure or heat, can realize the processing to elongate articles and thin-wall part.Owing to not being effect by mechanical pressure, therefore can process harder material, general requirement piece surface hardness before processing not higher than HRC60.
2) nano reinforcement.The interaction of ball and piece surface is high frequency (frequency is 30KHZ), effect macro-energy and that amplitude is very little, cause the miniature deformation of piece surface, the viscous deformation repeatedly of high frequency causes the crystal grain fragmentation, this special viscous deformation mode can make near the grain refining of material surface to nanometer scale, and this makes the surface grain refinement degree even more serious and even than other intense plastic strain modes such as ultrasonic impact, mechanical mills.The generation of nanocrystal makes the piece surface microhardness improve 20%～100%, wear resistance and the fatigue lifetime of having improved piece surface.
3) surface smoothness is high.Utilize the cold plasticity characteristics of metal under the normal temperature state, carrying out grinding, reinforcement and the miniature deformation of abrasive-free processes, make the metal parts surface reach more preferably surfaceness requirement, can make the surface smoothness of parts reach Ra0.01-Ra0.8, the surface of this ultra-smooth has further strengthened its wear resistance.
4) efficient is high.Direct in-situ carries out the ultrasonic nano intensive treatment after finish turning on horizontal lathe, has saved the middle transport process of piston rod, has improved working efficiency.This working method is than using grinding machine processing to economize the time of one times, and the positioning datum of processing parts is same benchmark simultaneously, and the line position tolerance easily guarantees.
Description of drawings
Fig. 1 is the ultrasonic nano consolidation system structural representation that the present invention uses.
In figure: 1, controller, 2, ultrasonic generator, 3, transverter, 4, horn, 5, ball, 6, spray bar, 7, elongate plunger rod, 8, fixture, 9, horizontal lathe, 10, knife rest.
Embodiment
The present invention is further described below in conjunction with drawings and Examples.
As shown in Figure 1, the ultrasonic nano consolidation system is mainly connected to form successively by ultrasonic wave module and lathe module.Wherein, ultrasonic wave module is comprised of controller 1, ultrasonic generator 2, transverter 3, horn 4, ball 5.The lathe module is comprised of spray bar 6, elongate plunger rod 7, fixture 8, horizontal lathe 9 and knife rest 10.In the nano reinforcement process, hyperacoustic parameter is regulated and Real Time Monitoring by controller 1; Ultrasonic generator 2 is in order to produce frequency at the 30KHz alternating voltage; Transverter 3 converts the 30KHz alternating voltage to ultrasonic vibration; Through horn 4, vibration amplitude is amplified; Drive ball 5 and do high-frequency vibration, ball 5 interacts with elongate plunger rod 7.In its interactional process, spray bar 6 injects lubricating oil between ball 5 and piston rod 7.The lubricating oil that uses is kerosene and the 20# machinery oil mixture of 1: 3.Piston rod 7 is connected with horizontal lathe 9 by fixture 8, makes elongate plunger rod 7 according to the parameter rotation of setting under the driving of horizontal lathe 9.Transverter 3 is connected with knife rest 10 and realizes moving axially.
Debugging: the height that the axis of transverter, horn, ball linker is debugged with elongate plunger rod is consistent, and vertical with its axis; Adjusting ball makes it rotate flexibly, stablize starting of oscillation; The numerical value of each table of controller shows normal, and the ultrasonic vibration output state is: output rating 480W, output frequency 30KHz; Pulsation of machine tool main shaft is less than 0.03mm; During transverse feed, the gap of system is less than 0.05mm;
Processing: diameter 50mm elongate plunger rod is carried out half finish turning; The complete rear finish turning of half finish turning reserves the ultrasonic machining amount according to the difference of parts; Open spray bar, speed of mainshaft 240r/min and the knife rest speed of feed 0.26mm/r of horizontal lathe is set according to the diameter of elongate plunger rod, start ultrasonic wave module, carry out the ultrasonic nano intensive treatment; Need in the course of processing to guarantee: after the piston rod finish turning, roughness should be not more than HRC60 less than Ra6.3, surface hardness; Maximum line velocity is 80m/min; The lubricating oil of spray bar ejection is kerosene and the 20# machinery oil mixture of 1: 3.
After machining, unload elongate plunger rod, close the ultrasonic nano consolidation system.After testing, the technical indicator after processing reaches: surface hardness raising 36%, layer depth 0.15mm; Roughness is Ra0.05.
Claims (3)
1. nanometer strengthening method of surface of long thin piston rod of hydraulic oil cylinder, it is characterized in that, the ultrasonic nano consolidation system that uses is: comprise horizontal lathe (9), be arranged on upper fixture (8), spray bar (6) and the knife rest (10) that is used for elongate piston rod (7) of horizontal lathe (9), the ultrasonic nano intensifying device; Described ultrasonic nano intensifying device comprises controller (1), ultrasonic generator (2), transverter (3), horn (4) and the ball (5) that connects successively; Transverter (3) is connected with knife rest (10); Concrete procedure of processing is as follows:
1) the ultrasonic nano consolidation system is set up in installation: controller (1), ultrasonic generator (2), transverter (3), horn (4), ball (5) are connected and installed successively; Elongate plunger rod to be processed (7) is arranged on fixture (8), and fixture (8), spray bar (6) and knife rest (10) are connected on horizontal lathe (9); Transverter (3) is connected with knife rest (10);
2) debugging: the height that the axis of transverter, horn, ball linker is debugged with elongate plunger rod is consistent, and vertical with its axis; Adjusting ball (5) makes it rotate flexibly, stablize starting of oscillation; The numerical value of each table of controller shows normal, and the ultrasonic vibration output state is: output rating 480W, output frequency 30kHz; Pulsation of machine tool main shaft is less than 0.03mm; During transverse feed, the gap of system is less than 0.05mm;
3) processing: elongate plunger rod is carried out half finish turning; The complete rear finish turning of half finish turning reserves the ultrasonic machining amount according to the difference of parts; Open spray bar, the speed of mainshaft and the knife rest speed of feed of horizontal lathe is set according to the diameter of elongate plunger rod, start the ultrasonic nano consolidation system, carry out the ultrasonic nano intensive treatment; Keep in the course of processing: after the piston rod finish turning, roughness should be not more than HRC60 less than Ra6.3, surface hardness; Maximum line velocity is 80m/min;
4) machine after, unload elongate plunger rod, close the ultrasonic nano consolidation system.
2. nanometer strengthening method of surface of long thin piston rod of hydraulic oil cylinder according to claim 1, is characterized in that, described elongated piston bar material to be processed is structural carbon steel, structural alloy steel, spring steel, bearing steel or rapid steel.
3. nanometer strengthening method of surface of long thin piston rod of hydraulic oil cylinder according to claim 1, is characterized in that, the lubricating oil of described spray bar ejection is kerosene and the 20# machinery oil mixture of 1: 3.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110410609 CN102492804B (en) | 2011-12-06 | 2011-12-06 | Nanometer strengthening method of surface of long thin piston rod of hydraulic oil cylinder |
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| CN 201110410609 CN102492804B (en) | 2011-12-06 | 2011-12-06 | Nanometer strengthening method of surface of long thin piston rod of hydraulic oil cylinder |
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| CN102492804B true CN102492804B (en) | 2013-06-12 |
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