CN103343187B - Laser composite treatment method of cast iron cam - Google Patents
Laser composite treatment method of cast iron cam Download PDFInfo
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- CN103343187B CN103343187B CN201310265857.1A CN201310265857A CN103343187B CN 103343187 B CN103343187 B CN 103343187B CN 201310265857 A CN201310265857 A CN 201310265857A CN 103343187 B CN103343187 B CN 103343187B
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- cast iron
- laser
- iron cam
- cam
- machined parameters
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Abstract
The invention relates to a laser composite treatment method of a cast iron cam. The laser composite treatment method comprises two steps of: firstly machining concave cavity texture on the surface of the cast iron cam by using laser with a machining parameter a, and then quenching the cast iron cam by using the laser with a machining parameter b. The laser composite treatment method has the advantages that the friction and wear between the cast iron cam and a top pillar frictional pair are reduced; a hardened layer is formed on the surface of the cast iron cam, so that the surface mechanical property and the abrasive resistance of the cast iron cam are significantly improved, and the ultimate beneficial effects, i.e., the service life of the cast iron cam is prolonged, the application range of the cast iron cam is expanded and the cast iron cam can be applied in working conditions which require high-quality steel are achieved; and the laser composite treatment method provided by the invention has the advantages that the cast iron cam is small in machining thermal deformation, and a subsequent straightening process in the machining of a long cast iron cam can be eliminated. According to the laser composite treatment method provided by the invention, the material cost for producing the cam and the production cost are greatly reduced.
Description
Technical field
The present invention relates to a kind of Laser composite treatment method of cast iron cam, belong to specific manufacture field.
Background technology
Cast iron cam is the parts with curved surface or crank slot, only need design suitable cast iron cam profile, driven member just can be made to realize desired movement.Cast iron cam structure is simple, compact, design is convenient, is therefore used widely in automatic machine tool, light industry and machinery, textile manufacturing machine, printing machinery, food machinery, wrapping mechanism and electromechanical integrated product.Camshaft is the key part of valve actuating mechanism and oil injection pump in motor car engine, accurately controls the keying of inlet and outlet door and supply time and pressure.According to the performance of engine, under high-power, non-high-speed operating mode, adopt steel camshaft; In, adopt cast iron cam shaft under lower powered high-speed working condition.Material cost and the production cost of steel camshaft are much higher than cast iron cam shaft, if make cast iron cam shaft can replace steel camshaft by certain technique, its meaning is very huge.
On cam profile, the wearing and tearing of each point are not identical, are generally that the wearing and tearing of lift area are comparatively serious.On the other hand, the functional requirement of cam its must have good abrasion resistance, therefore in the production of cam, apply a large amount of thermal treatment and surface strengthening technology.Traditional camshaft Surface heat-treatent technology comprises induction heating Surface hardening treatment technology, austemper case hardening treatment technology and carbonitriding (or carburizing) technology.Laser quenching technology, laser alloying technology and laser melting technology has been there is again after laser being applied in the surface strengthening of camshaft.
It is believed that the surface of friction pair contacted with each other is more smooth better in early days, and a large amount of theoretical investigation and engineering practice in recent years all shows, the surface with certain micro-geometrical structure has better resistance to abrasion on the contrary.Above-mentioned conclusion has obtained worldwide common recognition, is born and Surface Texture technology.Wherein, laser surface texture technology, refers to again the laser beam utilizing certain energy density, forms the groove, lines or the cavity that require Optimized Matching with lubricity at workpiece surface.
The pulsed laser bright dipping in the form of a pulse that the inventive method adopts, under different laser power densities, the mechanism of action of laser and metallic substance is not quite similar.Power density 10
3~ 10
4w/cm
2, laser thermal effect makes metallic substance temperature raise; Power density 10
4~ 10
6w/cm
2, strong thermal effect makes metal melt; Power density 10
6~ 10
8w/cm
2, material gasifies; Power density 10
8~ 10
10w/cm
2, metal is formation plasma body under the exciting of high-power energy.The power density of pulsed laser is defined as the ratio of single pulse energy and focal beam spot area.
Summary of the invention
The object of the invention is, improve surface mechanical properties and the abrasion resistance of cast iron cam, the use range of cast iron cam is expanded, life, and high-quality steel cam just competent operating mode can be applied in; Follow-up aligning operation can be exempted to the processing of long cast iron cam shaft simultaneously.
The technical scheme that a kind of Laser composite treatment method of cast iron cam of the inventive method is taked is: first under machined parameters a, and laser is in cast iron cam face processing cavity texture, and under machined parameters b, laser hardens to cast iron cam subsequently.
The concrete technical scheme that a kind of Laser composite treatment method of cast iron cam of the inventive method is taked is, first under machined parameters a, laser in cast iron cam face processing cavity texture, the power density of the laser pulse that machined parameters a is corresponding in gasification or plasmarized interval, namely 10
6~ 10
10w/cm
2.Under machined parameters b, cast iron cam face is hardened subsequently, the power density of the laser pulse that machined parameters b is corresponding between melt zone, namely 10
4~ 10
6w/cm
2; Above-mentioned cavity texture area at least comprises cast iron cam rise region, and above-mentioned hardened area only comprises cast iron cam rise region.The structural parameters of cavity is: diameter 65 ~ 75um, the degree of depth 6 ~ 8um, area ratio/occupancy ratio 8 ~ 11%, wherein diameter is the least square diameter of cavity pattern, the degree of depth is cavity pattern deepest point distance cast iron cam face distance, and area ratio/occupancy ratio is the per-cent that in texture area, nick cavity area accounts for this region total area.Quench-hardened case thickness 0.1 ~ 0.5mm, hardness HRC50 ~ 70.
In above-mentioned machined parameters a and machined parameters b, the parameter that the power density of laser pulse is changed comprises: pumping current, pulse-repetition, defocusing amount.
The controling parameters of quench-hardened case thickness is power density and the Duplication of hardening.Duplication is two the pulse hot spot crossing areas of adjacent effect with cast iron cam face and the ratio of facula area.To harden power density 10
4~ 10
6w/cm
2, Duplication 40% ~ 90%.
The invention has the advantages that: reduce the friction and wear between cam-fore-set friction pair; Quench-hardened case is formed at cast iron cam face, significantly improve surface mechanical properties and the abrasion resistance of cast iron cam, final beneficial effect is the life making cast iron cam, extends the use range of cast iron cam, under can being applied in the competent operating mode of high-quality steel cam; The cast iron cam thermal distortion that present method causes is little, can exempt follow-up aligning operation to the processing of long camshaft.
Accompanying drawing explanation
Fig. 1 is cast iron cam laser multiple processing schematic diagram.
In figure, 1, cast iron cam; 2, lift area; 3, cavity; 4, quench-hardened case.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is further described.
Fig. 1 is cast iron cast iron cam laser multiple processing schematic diagram.
The present embodiment adopts the Nd:YAG continuous solid body laser apparatus of diode pumping.It is significant to note that the inventive method does not have particular requirement to laser apparatus kind.
First, under machined parameters a, laser is in cast iron cam 1 surface working cavity texture, and under machined parameters b, laser hardens to cast iron cam subsequently.The power density of the laser pulse that machined parameters a is corresponding in gasification or plasmarized interval, namely 10
6~ 10
10w/cm
2; The power density of the laser pulse that machined parameters b is corresponding between melt zone, namely 10
4~ 10
6w/cm
2.In above-mentioned machined parameters a and machined parameters b, the parameter that the power density of laser pulse is changed comprises: pumping current, pulse-repetition, defocusing amount, hardening by completing process zone point by point scanning to cast iron cam 1, there is overlapping region in adjacent scanning spot, Duplication 40% ~ 90%.Under machined parameters a, pumping current 16 ~ 19A, pulse-repetition 1400 ~ 1800Hz, defocusing amount 0 ~ 0.2mm, wherein pulse-repetition is the laser pulse number that laser apparatus sends p.s..Under machined parameters b, pumping current 16 ~ 19A, pulse-repetition 1400 ~ 6000Hz, defocusing amount 0 ~ 2mm.Cavity texture area at least comprises the lift area 2 of cast iron cam 1, and above-mentioned hardened area only comprises the lift area 2 of cast iron cam 1.One or more laser pulse machines a cavity 3 pattern processing.The structural parameters of cavity 3 is: diameter 65 ~ 75um, the degree of depth 6 ~ 8um, area ratio/occupancy ratio 8 ~ 11%, wherein diameter is the least square diameter of cavity 3, the degree of depth is cavity 3 deepest point distance cast iron cam face distance, and area ratio/occupancy ratio is the per-cent that cavity texture area inner cavity 3 area accounts for this region total area; Quench-hardened case 4 thickness 0.1 ~ 0.5mm, hardness HRC50 ~ 70.
Claims (3)
1. a Laser composite treatment method of cast iron cam, it is characterized in that, comprise two steps: first under machined parameters a, laser is in cast iron cam (1) surface working cavity texture, the structural parameters of cavity texture is: diameter 65 ~ 75 μm, the degree of depth 6 ~ 8 μm, area ratio/occupancy ratio 8 ~ 11%, wherein diameter is the least square diameter of cavity (3) pattern, the degree of depth is cavity (3) pattern deepest point distance cast iron cam (1) surface distance, and area ratio/occupancy ratio is the per-cent that cavity texture area inner cavity (3) area accounts for this region total area; Quench-hardened case (4) thickness 0.1 ~ 0.5mm, hardness HRC50 ~ 70; Under machined parameters b, laser hardens to cast iron cam (1) subsequently, and the laser apparatus in machined parameters a and machined parameters b is same pulsed laser, adopts the Nd:YAG continuous solid body laser apparatus of diode pumping; The power density of the laser pulse that machined parameters a is corresponding, in gasification or plasmarized interval, is 10
6~ 10
10w/cm
2; The power density of the laser pulse that machined parameters b is corresponding, between melt zone, is 10
4~ 10
6w/cm
2, in described machined parameters a and machined parameters b, the parameter that the power density of laser pulse is changed comprises: pumping current, pulse-repetition, defocusing amount, hardens by completing process zone point by point scanning to cast iron cam (1), there is overlapping region in adjacent scanning spot, Duplication 40% ~ 90%.
2. a kind of Laser composite treatment method of cast iron cam according to claim 1, is characterized in that, above-mentioned cavity texture area at least comprises cast iron cam (1) lift area (2), and described hardened area only comprises cast iron cam (1) lift area (2).
3. a kind of Laser composite treatment method of cast iron cam according to claim 1 and 2, is characterized in that, under machined parameters a, pumping current 16 ~ 19A, pulse-repetition 1400 ~ 1800Hz, defocusing amount 0 ~ 0.2mm, wherein pulse-repetition is the laser pulse number that laser apparatus sends p.s.; Under machined parameters b, pumping current 16 ~ 19A, pulse-repetition 1400 ~ 6000Hz, defocusing amount 0 ~ 2mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310265857.1A CN103343187B (en) | 2013-06-28 | 2013-06-28 | Laser composite treatment method of cast iron cam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310265857.1A CN103343187B (en) | 2013-06-28 | 2013-06-28 | Laser composite treatment method of cast iron cam |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103343187A CN103343187A (en) | 2013-10-09 |
| CN103343187B true CN103343187B (en) | 2014-12-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310265857.1A Expired - Fee Related CN103343187B (en) | 2013-06-28 | 2013-06-28 | Laser composite treatment method of cast iron cam |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105177274A (en) * | 2015-10-19 | 2015-12-23 | 无锡清杨机械制造有限公司 | Laser hardening process |
| CN114473211B (en) * | 2022-03-01 | 2024-02-20 | 北京航空航天大学合肥创新研究院(北京航空航天大学合肥研究生院) | Gear surface laser composite modification method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101318262A (en) * | 2008-06-25 | 2008-12-10 | 江苏大学 | Laser micro-modelling method for cam surface profile |
| CN102373317A (en) * | 2010-08-19 | 2012-03-14 | 中国人民解放军军事交通学院 | Cast iron camshaft laser-melting surface strengthening technology |
| CN103060528A (en) * | 2013-01-14 | 2013-04-24 | 温州大学 | Laser compound strengthening technology |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008267598A (en) * | 2007-03-23 | 2008-11-06 | Yamaha Motor Co Ltd | Crankshaft, internal combustion engine, transportation apparatus, and manufacturing method for crankshaft |
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2013
- 2013-06-28 CN CN201310265857.1A patent/CN103343187B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101318262A (en) * | 2008-06-25 | 2008-12-10 | 江苏大学 | Laser micro-modelling method for cam surface profile |
| CN102373317A (en) * | 2010-08-19 | 2012-03-14 | 中国人民解放军军事交通学院 | Cast iron camshaft laser-melting surface strengthening technology |
| CN103060528A (en) * | 2013-01-14 | 2013-04-24 | 温州大学 | Laser compound strengthening technology |
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| CN103343187A (en) | 2013-10-09 |
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