CN1171700C - Method for laser compound treating surface of friction pair - Google Patents
Method for laser compound treating surface of friction pair Download PDFInfo
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- CN1171700C CN1171700C CNB021380767A CN02138076A CN1171700C CN 1171700 C CN1171700 C CN 1171700C CN B021380767 A CNB021380767 A CN B021380767A CN 02138076 A CN02138076 A CN 02138076A CN 1171700 C CN1171700 C CN 1171700C
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Abstract
The present invention is suitable for the composite laser processing of the surface of a friction pair, particularly for processing the surface of a cylinder hole of an internal combustion engine. A wearproof hardening layer and microscopic geometry patterns for lubricating are formed on the surface of the cylinder hole. The present invention carries out the composite laser processing for areas which are seriously worn, and forms a series of microscopic recessed cavities with the effects of micro pressure chambers and hardening surfaces which have the advantages of wearproof effect and impact resistance. The present invention carries out microscopic geometric pattern laser molding for other wearing areas to form continuous, uniform and crisscross oil paths for storing oil to make lubrication, wherein the oil paths are matched with the requirements of the lubricating property of the present invention. The present invention respectively uses two different lasers and laser parameters to carry out the laser molding processing for the microscopic recessed cavities and geometric patterns. In addition, the distribution and the shapes of the microscopic recessed cavities are set according to hardening effects. The present invention has the advantages that the laser transformation hardening technology and the laser micro-processing technology are utilized integrally, which fundamentally improves the lubricating situations of the seriously worn areas of the surface of the friction pair.
Description
Affiliated technical field
The present invention relates to field of machining, refer in particular to the method for laser compound treating of surface of friction pair, it is specially adapted to the processing of cylinder of internal-combustion engine hole surface, and process is handled, and forms wear-resisting hardened layer on the cylinder-bore surface and can supply lubricated micro-geometrical structure.
Background technology
As everyone knows, in the common mechanical apparatus system, exist various forms of friction pairs.The tribology behavior of these friction pairs not only influences the operational efficiency of mechanical system, or even causes the main cause of its inefficacy.Cylinder-bore and piston ring are one of friction pairs of most critical in the internal combustion engine, directly influence the service life and the performance of internal combustion engine.Because it is operated under high temperature, high pressure, the mal-condition at a high speed, and various wearing and tearing easily take place, therefore be necessary to improve the antiwear and reducing friction performance.And the antiwear and reducing friction performance is relevant with following four factors, i.e. the lubricating status on cylinder-bore surface roughness, the compatibility with piston ring, cylinder-bore case hardness and surface.In order to improve the geometry compatibility of cylinder-bore surface roughness and cylinder-bore and piston ring, the method that the final processing in cylinder-bore surface is at present adopted is honing.Behind the thick top gem of a girdle-pendant and the smart top gem of a girdle-pendant, carry out flat top honing again, aspect machined,, to have brought into play to the utmost point to the greatest extent with regard to present means and method, few of potentiality can have been excavated.In order to improve case hardness, people attempted various heat treatment methods, but owing to be cast iron materials, had the graphite phase, therefore produced little effect.More domestic producers begin to adopt laser heat treatment method now, can increase substantially case hardness, but LASER HEAT TREATMENT easily makes cylinder-bore deform, need to arrange the follow-up honing operation of long period, increased cost significantly, but also may be provided with improperly because of parameter, make between cylinder-bore and the piston ring to produce " frustrating plate " effect.In order to improve the lubrication state on surface, Deutsche Bundespatent (DE4316012) proposes to utilize the laser beam with certain energy density, forms crisscross lubricant passage way and store oil cavity on the surface, but the case hardness of material does not improve.
Summary of the invention
The purpose of this invention is to provide a kind of method for laser compound treating that can improve the surface of friction pair of Wear-resistant performance.It can improve the lubrication state on surface again significantly when increasing substantially surface of friction pair hardness.
Realize that technical scheme of the present invention is:
It is characterized in that the laser Combined Processing is carried out in the most serious zone of wearing and tearing, formation has a series of microcosmic cavitys of little balancing gate pit effect and the hardened surface of wear resistant and impact resistant; The micro-geometrical structure laser stereo lithography is implemented in zone to other wearing and tearing, forms uniform, the crisscross continuously store oil lubricant passage way that requires to optimize coupling with its greasy property.And utilize neodymium-doped yttrium-aluminum garnet (YAG) laser instrument cavity moulding of laser microcosmic and transformation hardening Combined Processing to be carried out in the most serious zone of wearing and tearing respectively, implement the micro-geometrical structure laser stereo lithography on other surface, position and handle with different laser parameters.
And according to hardening effect the microcosmic cavity being set distributes and shape.Oil circuit not only intersects mutually but also is parallel to each other, and is interconnected by joint.
Advantage of the present invention is that laser transformation hardening technology and laser fine process technology are carried out integrated use.
(1) at the most serious top dead centre near zone of pair of friction components surface abrasion, according to the elastohydrodynamic lubrication theory, optimize serial microcosmic cavity is set, utilize the extrusion effect of friction pair moving surface, make these cavitys have the effect of microcosmic balancing gate pit, help under the very little situation of Entrainment Velocity, set up elasticity lubricating oil film with certain minimum thickness, simultaneously, these microcosmic cavitys also have the double action of holding oil sump and assembling molecule, and this has fundamentally improved the lubrication state in the most serious zone of pair of friction components surface abrasion.
(2) fuel factor that when carrying out these microcosmic cavity moulding, had of laser beam, can implement transformation hardening to surface of friction pair simultaneously handles, in this zone formation one deck wear-resisting hardened layer has increased substantially the most wear-resisting abrasion resistance in serious zone of pair of friction components surface abrasion.
(3) the hard point that is formed centrally in these microcosmic cavitys being, the his-and-hers watches mask has pinning effect, has improved surface strength and shock resistance greatly.
(4) because in the movement velocity in the most serious zone of pair of friction components surface abrasion lubricating condition more slowly and preferably, the wearability of piston ring also is improved.
(5) in other zones of friction pair, utilize femtosecond high-frequency impulse laser beam, depict with greasy property require to optimize coupling, continuously uniformly and to have the store oil of certain density (spacing), width, the degree of depth, angle, shape lubricated.Because laser pulse width is the femtosecond magnitude, the effect of laser and surfacing belongs to " cold working ", does not have fuel factor, has avoided inside and outside molten quarrel of oil circuit and carbonization phenomenon.Oil circuit is smooth smooth, and the burr of surface of the work, particle, overlap etc. greatly reduce.The burr of face, particle, overlap etc. greatly reduce.
(6) be arranged on the oil circuit that extends in all direction, is evenly distributed, is interconnected of surface of the work, help the conveying and the storage of lubricating oil, reduced oil-poor phenomenon, guarantee to have between cylinder-bore and the piston ring formation and the maintenance of certain minimum thickness oil film, to form full hydrodynamic lubrication, improved surperficial lubrication state significantly.
Description of drawings
The present invention is specified by following examples and accompanying drawing.
Fig. 1 is a laser surface composite handling arrangement schematic diagram.
Fig. 2 is a cylinder-bore surface laser Combined Processing distribution schematic diagram.
What Fig. 3 represented is laser Combined Processing enlarged diagram on the top dead centre near zone.
1. laser generators, 2. outside optical systems, 3. laser deliveries, 4. speculums, 5. lens, 6. speculums, 7. workpiece, 8. microcosmic cavitys, 9. hardened layers, 10. oil circuits, 11. joints among the figure
The specific embodiment
As shown in Figure 1, this device comprises laser generator (1), laser delivery (3) and (2) three major parts of outside optical system of being made up of speculum (4), lens (5), speculum (6).The laser that laser generator (1) produces is assembled to lens (5) through speculum (4), shines on workpiece (7) surface through speculum (6) again.Pump and the rotatablely moving of workpiece (7) self by laser delivery (3), or laser delivery (3) self rotatablely moves, or the rotatablely moving of speculum (6) in the laser delivery (3), the laser scanning track that can synthesize different shape, thus realize the surface laser Combined Processing on the workpiece desired zone.
Shown in Fig. 2,3, embodiments of the invention are for handling the cylinder-bore surface.Through after the final mechanical honing Precision Machining, formation can be for the initial surface of laser Combined Processing in cylinder-bore.The roughness Rz of initial surface is 1-2um, guarantees that how much patterns of surface microscopic depend primarily on the laser Combined Processing.Lubricated and wear characteristic according to cylinder-bore can be divided into its surface three different zones, i.e. I, II, III.Area I is the top dead centre near zone, and area I I is the stroke central region, and area I II is a lower area.Because the difference of conditions of work such as the load of being born, lubrication state, the area I wearing and tearing are the most serious, and area I I takes second place, and area I II is the lightest.Therefore, the also corresponding difference of the laser Combined Processing on the zones of different.The laser Combined Processing is implemented on the cylinder-bore surface carries out in two steps.The first step is utilized the YAG laser instrument, and the microcosmic cavity that on area I, setting is evenly distributed, spacing is intensive, isolate each other utilizes the fuel factor of laser beam to carry out surperficial transformation hardening processing simultaneously.Second step, utilize femtosecond pulse, on area I I and area I II, form with greasy property require to optimize coupling, continuously uniformly and to have a determining deviation, width, the degree of depth, angle be the lubricated store oil oil circuit of the reticulate pattern cross-like of α.
Utilize device shown in Figure 1, will have the laser beam of certain spot size, by the resultant motion of delivery (3) and workpiece (7), shine surface of the work and form a series of microcosmic cavitys (8), the dash area of cavity peripheral region is hardened layer (9).The bore of cavity is 30～80 μ m, and the degree of depth is 15～30 μ m, and the number in every square millimeter is 2 * 2～6 * 6.
Oil circuit (10) is the reticulate pattern cross shaped head, and is interconnected by joint (11), is evenly distributed on the surface of the work.Angle α between the oil circuit (10) is 20 °～70 °, and spacing is 0.1～1mm, and oil circuit (10) width is 10～70um, and the degree of depth is 5～15um.
Show by internal combustion engine bench test, the laser surface composite treatment technology, can obtain following effect: the cylinder-bore wearability is carried and having been done more than 4 times, and the piston ring scuffing amount of Pei Heing has descended 50% with it, and machine oil disappears, HC discharge capacity, fuel oil consumption and catalyst converter pollute also and obviously descend.
Embodiment of the present invention only is used to illustrate the present invention, and does not limit.
Claims (4)
1. the method for laser compound treating of surface of friction pair is characterized in that the laser Combined Processing is carried out in the most serious zone of wearing and tearing, forms to have a series of microcosmic cavitys of little balancing gate pit effect and the hardened surface of wear resistant and impact resistant; The micro-geometrical structure laser stereo lithography is implemented in zone to other wearing and tearing, forms uniform, the crisscross continuously store oil lubricant passage way that requires to optimize coupling with its greasy property.
2. the method for laser compound treating of surface of friction pair according to claim 1, it is characterized in that utilizing respectively neodymium-doped yttrium-aluminum garnet (YAG) laser instrument cavity moulding of laser microcosmic and transformation hardening Combined Processing to be carried out in the most serious zone of wearing and tearing, implement the micro-geometrical structure laser stereo lithography on other surface, position and handle with different laser parameters.
3. the method for laser compound treating of surface of friction pair according to claim 1 is characterized in that according to hardening effect the microcosmic cavity being set distributes and shape.
4. the method for laser compound treating of surface of friction pair according to claim 1 is characterized in that oil circuit not only intersects mutually but also is parallel to each other, and is interconnected by joint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021380767A CN1171700C (en) | 2002-08-06 | 2002-08-06 | Method for laser compound treating surface of friction pair |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021380767A CN1171700C (en) | 2002-08-06 | 2002-08-06 | Method for laser compound treating surface of friction pair |
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| CN1401457A CN1401457A (en) | 2003-03-12 |
| CN1171700C true CN1171700C (en) | 2004-10-20 |
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| CNB021380767A Expired - Fee Related CN1171700C (en) | 2002-08-06 | 2002-08-06 | Method for laser compound treating surface of friction pair |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101204755B (en) * | 2007-12-18 | 2011-05-04 | 中国石油大学(华东) | Metal member surface microscopic topographic controlled manufacturing process implement method |
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| FR2907356B1 (en) * | 2006-10-20 | 2009-05-22 | Hef Soc Par Actions Simplifiee | PIECE OF FRICTION IN LUBRIFIED ENVIRONMENT AND WHOSE SURFACE IS TEXTURED. |
| CN102513697A (en) * | 2011-12-29 | 2012-06-27 | 江苏大学 | Preparation method for simulated surfaces |
| CN102878289B (en) * | 2012-09-29 | 2016-03-30 | 中国船舶重工集团公司第十二研究所 | A kind of cylinder sleeve inner wall oil circuit structure and preparation method thereof |
| CN103071923B (en) * | 2012-12-28 | 2016-05-25 | 江苏大学 | A kind of laser-transmitting composite connecting method |
| CN103060796A (en) * | 2013-01-14 | 2013-04-24 | 温州大学 | Method for repairing and strengthening gear through laser compound microtexture |
| CN103111752A (en) * | 2013-01-14 | 2013-05-22 | 温州大学 | Method and device for forming micro-texture in composite mode on inner surface of cylinder sleeve through laser |
| CN103060528A (en) * | 2013-01-14 | 2013-04-24 | 温州大学 | Laser compound strengthening technology |
| CN103925253B (en) * | 2014-04-16 | 2017-08-01 | 常州轻工职业技术学院 | High-pressure multi-path valve based on laser micro-machining technology |
| CN104455407B (en) * | 2014-11-03 | 2016-08-24 | 中国船舶重工集团公司第十二研究所 | A kind of cylindrical inner wall network oil-bearing structure preparation method |
| CN104911328B (en) * | 2015-05-28 | 2017-10-13 | 湖北工业大学 | A kind of method that utilization ultra-short pulse laser prepares the super-hydrophobic corrosion-resistant surface of cast iron |
| CN105179451B (en) * | 2015-10-23 | 2018-07-06 | 安徽鑫科铜业有限公司 | The texture abrasion resistant axial journal and its processing method of a kind of magnetisable coating |
| CN109944865A (en) * | 2019-03-26 | 2019-06-28 | 承德苏垦银河连杆有限公司 | A kind of crank pin end pore interior wall construction and its processing method |
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2002
- 2002-08-06 CN CNB021380767A patent/CN1171700C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101204755B (en) * | 2007-12-18 | 2011-05-04 | 中国石油大学(华东) | Metal member surface microscopic topographic controlled manufacturing process implement method |
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| CN1401457A (en) | 2003-03-12 |
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