CN103627856A - Device and method for carrying out laser strengthening on LED (Light Emitting Diode) headlamp mould - Google Patents
Device and method for carrying out laser strengthening on LED (Light Emitting Diode) headlamp mould Download PDFInfo
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Abstract
The invention discloses a device and a method for carrying out laser strengthening on an LED (Light Emitting Diode) headlamp mould. The device comprises a computer control processing system, a coaxial powder feeding type laser cladding unit, a laser shock intensifying unit and an auxiliary working system. According to the method, fatigue cracks of an LED headlamp mould are subjected to laser cladding repairing and a cladding layer is subjected to laser shock intensifying processing to effectively solve the problems that the LED headlamp mould easily has inner defects including cracks, air pores and the like in the laser cladding repairing process; with the adoption of the method, a surface cladding layer with excellent performance and high quality can be obtained on the surface of the LED headlamp mould and a high-amplitude residual compressive stress is generated; the fretting fatigue resistance on the surface of the mould is improved effectively and the mechanical property of the LED headlamp mould is improved comprehensively; the fatigue life of the mould is prolonged greatly and the aims of prolonging the service life and improving the stability are realized.
Description
Technical field
The present invention relates to a kind of apparatus and method of utilizing laser to strengthen workpiece surface, relate in particular to a kind of device and method that LED headlamp mould is carried out to laser reinforcing.
Background technology
LED (Light Emitting Diode) is little with its volume, the life-span is long, energy consumption is low, vibration resistance, start time fast and the advantage such as environmental protection, has become the first-selection of automotive luminaire technology of new generation.But LED lampshade mould long service is under the working condition in high temperature, high pressure, heavily stressed and corrosion, and lampshade mould surface will inevitably produce the inefficacies such as fatigue cracking, wearing and tearing and distortion.The inefficacy of mould of plastics not only affects the quality of product but also increases production cost, and frequent more mold exchange more can cause turnout decline ，Gei enterprise to bring huge financial loss, at present, the method of lengthening the life for LED headlamp die and mould strengthening is mainly that traditional restorative procedure is (as built-up welding, electroplate etc.) and single laser melting coating or laser impact intensified: the Chinese patent that the patent No. is CN201110367257.7 discloses a kind of LASER HEAT stress effect enhancement method of the LED of being applicable to headlamp mould, the method is mainly to utilize the recombining process of laser quenching and laser-impact to improve hardness and the intensity of LED headlamp die surface, so that LED headlamp mould reaches the object that strengthening is lengthened the life, so the method only limits to the strengthening of LED headlamp mould to lengthen the life, the fatigue cracking defect that but can not fundamentally occur LED headlamp mould is solved.Document < < Pulse Nd: disclose a kind of laser melting coating repairing plastic die method research that utilizes in the optimization > > of YAG laser melting coating repairing plastic mould process parameter, though the life-span of utilizing mould of plastics that laser melting coating reparation was lost efficacy can improve to a certain extent mould, in single laser melting and coating process process, occur be mingled with, work-ing life that the defect such as crackle and pore is limiting mould of plastics also.
Summary of the invention
The object of the present invention is to provide a kind of device and method that LED headlamp mould is carried out to laser reinforcing, in order to eliminate the defects such as pore in LED headlamp mould cladding layer, thermal crack, reduce the residual tension level in cladding layer.
Innovation of the present invention is just fully to combine laser melting coating and laser impact intensified feature, avoided the welding distortion in conventional machining method, heat affected zone is large, be prone to thermal crack, in use procedure, easily produce come off, problems of crack, efficiently solve the subsurface defect problems such as the crackle that easily produces in laser cladding process, pore.First LED headlamp mould is carried out to laser melting coating reparation, make cladding layer material and matrix form good metallurgical binding, improved wear-resisting, the anti-corrosion and resistance of oxidation of metallic surface, significantly improved fatigue strength and the work-ing life of material.Again cladding layer is carried out to laser impact intensified processing, at LED headlamp die surface, produce high amplitude residual compressive stress, effectively improve the fretting fatigue drag of die surface, suppressed the germinating of fatigue cracking, reduced the spreading rate of fatigue cracking.Therefore this treatment process will be greatly improved wear resistance, corrosion stability and the fatigue strength of material, and then has extended the work-ing life of LED headlamp mould.
The technical scheme that the present invention takes is: a kind of device that LED headlamp mould is carried out to laser reinforcing, comprise computer control treatment system, coaxial powder-feeding formula laser melting coating unit, laser impact intensified unit and back work system, wherein, computer control treatment system comprises central control processor, carbon dioxide laser controller and YAG pulsed laser controller; Described carbon dioxide laser controller is all connected with described central control processor with described YAG laser controller; Described coaxial powder-feeding formula laser melting coating unit comprises YAG pulsed laser, argon protective device, the first completely reflecting mirror, the first light pipe, adjustable powder feeder and coaxial working head; Described YAG pulsed laser is connected with described YAG pulsed laser controller, described argon protective device, described adjustable powder feeder and described coaxial working head are connected with described central control processor respectively, described the first completely reflecting mirror, the first light pipe and described coaxial working head form light path transfer system, and the cladding powder in described adjustable powder feeder is transported to workpiece to be processed surface by described coaxial working head; Described laser impact intensified unit comprises carbon dioxide laser, the second completely reflecting mirror, the second light pipe, light beam conversion and setting device; Described carbon dioxide laser is connected with described carbon dioxide laser controller, and described carbon dioxide laser, the second completely reflecting mirror, the second light pipe, light beam conversion and setting device form light path transfer system; Described back work system comprises five-axle linkage worktable, fixture and worktable controller, described fixture is fixed on described five-axle linkage worktable, described five-axle linkage worktable is connected with described worktable controller, and described worktable controller is connected with described central control processor.
In such scheme, also comprise a surface profile scanner, described surface profile scanner is connected with described central control processor.
A method of LED headlamp mould being carried out to laser reinforcing, comprises the steps.
A: treat cladding LED headlamp die surface and carry out macroscopic test, determine the position of crackle, and remove oil stain and the dirt of die surface with alcohol or acetone.
B: processed good LED headlamp mould is put on five-axle linkage worktable, is located afterwards and fixes to clamp with fixture.
C: central control processor regulates five-axle linkage worktable by numerical control operating platform; make to treat that cladding LED headlamp mould is in coaxial working head below; central control processor sends and feeds back signal to YAG pulsed laser controller and coaxial working head; YAG pulsed laser produces pulse laser; through the first light pipe, coaxial working head, be irradiated to LED headlamp convex mould surface; the adjustable powder feeder of being controlled by central control processor is sent into molten bath by cladding powder through coaxial working head simultaneously, and starts argon protective device protection cladding powder with anti-oxidation.
D: after cladding layer is cooling, clean LED headlamp convex mould surface with alcohol, the dry rear pitch-dark absorption layer that applies.
E: central control processor sends and feeds back signal to carbon dioxide laser controller and light beam conversion and setting device, carbon dioxide laser produces continuous laser under the control of carbon dioxide laser controller, through the first light pipe, is irradiated on LED headlamp convex mould surface; Central control processor regulates five-axle linkage worktable under the effect of worktable controller simultaneously, completes the cladding of whole LED headlamp convex mould surface.
F: clean the pitch-dark of LED headlamp convex mould surface impact zone with alcohol or acetone.
G: the LED headlamp punch of having repaired is carried out to surfaceness check by central control processor control surface profile scanner, making to repair LED headlamp die surface roughness reaches below Ra3.2, as not reaching requirement, central control processor carries out secondary laser impact or polished finish to LED headlamp mould.
H: repair member is carried out to nondestructive testing.
In aforesaid method, adopt non-destructive test(ing)(NDT) detection method to determine particular location, shape and the size for the treatment of cladding LED headlamp mould inside crackle.
Concrete advantage of the present invention: (1) repairing effect is better: laser melting coating impacts the crackle that Combined Processing can not only effectively be repaired LED headlamp mould, and the depth of residual stress that laser-impact forms is 10 times of left and right that mechanic shot peening forms, reach more than 3 times the fatigue lifetime that can significantly improve LED headlamp mould.(2) wider: for certain body material, can to select suitable Metal Melting whiting end to repair.Laser melting coating+laser-impact composite treatment technology can be repaired arbitrary shape, arbitrary surface, and other restorative procedures have its limitation.(3) distortion on laser melting coating impact composite treatment technology repair materials surface is very little, does not affect structural part heart portion performance.(4) laser melting coating impacts composite treatment technology reparation simple and fast, and efficiency is high, greatly reduces maintenance cost.(5) laser melting coating impacts composite treatment technology feature of environmental protection excellence: without any pollution.Secondary pollution to environment while avoiding the ways of recycling such as employing is melted down, smelting is green reproducing method.
Accompanying drawing explanation
Fig. 1 utilizes laser melting coating in conjunction with laser impact intensified method for modifying composite surface, to process the device schematic diagram of LED headlamp mould.
Fig. 2 is the partial enlarged drawing of the LED headlamp punch in laser impact intensified stage
In figure, 1, central control processor 2, the second completely reflecting mirror 3, the second light pipe 4, carbon dioxide laser 5, carbon dioxide laser controller 6, light beam conversion and setting device 7, surface profile scanner 8, absorption layer 9, restraint layer 10, fixture 11, cladding layer 12, LED headlamp punch 13, five-axle linkage worktable 14, worktable controller 15, argon protective device 16, adjustable powder feeder 17, YAG pulsed laser controller 18, YAG pulsed laser 19, the first light pipe 20, the first completely reflecting mirror 21, coaxial working head.
Embodiment
Below in conjunction with Fig. 1, this device is described in further detail.
As shown in Figure 1, a kind of LED headlamp mould fatigue cracking laser reinforcing life-prolonging method and device, comprise central control processor 1, the second completely reflecting mirror 2, the second light pipe 3, carbon dioxide laser 4, carbon dioxide laser controller 5, light beam conversion and setting device 6, surface profile scanner 7, fixture 10, LED headlamp punch 12, five-axle linkage worktable 13, worktable controller 14, argon protective device 15, adjustable powder feeder 16, YAG pulsed laser controller 17, YAG pulsed laser 18, the first light pipe 19, the first completely reflecting mirror 20, coaxial working head 21.
Specific implementation process is: treat cladding LED headlamp punch 12 surfaces and carry out macroscopic test, determine particular location, shape and the size (preferably adopting non-destructive test(ing)(NDT) to detect to determine particular location, shape and the size for the treatment of cladding LED headlamp mould inside crackle) of crackle, with alcohol or acetone, remove oil stain and the dirt for the treatment of cladding LED headlamp punch 12 surfaces, treating that cladding LED headlamp punch 12 is put on five-axle linkage worktable 13, after having good positioning, use fixture 10 by its clamping, central control processor 1 is controlled worktable controller 14 and is regulated five-axle linkage worktable 13, make cladding LED headlamp punch 12 to be treated with coaxial working head 21 in suitable Working position, then central control processor 1 is controlled the processing parameter of YAG pulsed laser 18 by YAG pulsed laser controller setter 17, make parameter meet the enforcement requirement of laser melting and coating process, laser apparatus produces pulse laser, through the second light pipe 3, the second completely reflecting mirror 2, coaxial working head 21 is applied on LED headlamp punch 12 surfaces, the adjustable powder feeder 16 of being controlled by central control processor 1 starts cladding powder to send into molten bath by coaxial working head 21 simultaneously, and start argon protective device 15 and start to carry out protection against oxidation in cladding process, finally by central control processor 1, control worktable controller 14 and regulate five-axle linkage worktable 13, the region that LED headlamp punch 12 is repaired according to the complete required laser melting coating of certain track motion scan.Then with alcohol, clean LED headlamp punch 12 surfaces, after dry, coat pitch-dark, by worktable controller 14, regulate five-axle linkage worktable 13, make LED headlamp punch 12 in suitable Working position, now by central control processor 1, control the parameter of carbon dioxide laser controller 5 and light beam conversion and setting device 6 regulation of carbon dioxide laser apparatus 4, make parameter meet laser impact intensified enforcement requirement; Carbon dioxide laser 4 produces continuous laser, through the first light pipe 19, the first completely reflecting mirrors 20, restraint layer 10, absorption layer 9, is applied on LED headlamp punch 12 surfaces; By worktable controller 14, regulate five-axle linkage worktable 13, make the laser impact intensified cladding LED headlamp convex mould surface of handling.Then with alcohol or acetone, clean the pitch-dark of LED headlamp convex mould surface impact zone.The LED headlamp punch of having been repaired by 7 pairs of central control processor 1 control surface profile scanner carries out surfaceness check, making to repair LED headlamp die surface roughness reaches below Ra3.2, as do not reach requirement, will carry out secondary laser impact or polished finish to mould.Finally repair member is carried out to non-destructive test(ing)(NDT) detection.
Embodiment mono-
The LED headlamp punch of NAK80 material, die surface is carried out to macroscopic test, determine the particular location of crackle, shape and size, with alcohol or acetone, remove oil stain and the dirt of die surface, mould is put on five-axle linkage worktable, after having good positioning, with fixture, clamped, regulate five-axle linkage worktable to make on mould and the position of coaxial working head in suitable processing, regulate high impulse YAG pulsed laser processing parameter: laser power is 1500W, spot diameter is 3mm, sweep velocity is 5mm/s, overlapping rate is 30%, cladding powder is used in substrate alloy in conjunction with good Ni base alloy powder (granularity 150 ~ 250 orders) and cast tungsten carbide (WC+ W
2c) mixed powder of ceramic powder (granularity 100 ~ 150 orders), damage location is carried out to laser melting coating reparation, by worktable controller, regulate five-axle linkage worktable, mould is moved with certain track, required cladding layer is shaped, after cladding layer cooling curing, with alcohol, remove the slag on cladding layer, after being dried, coat pitch-dark, regulation of carbon dioxide laser process parameter: laser energy is 30J, output wavelength is 10.6 μ m, spot diameter is 5mm, take water as restraint layer carries out laser impact intensified processing to cladding area, then with alcohol, cleans and impacts go pitch-dark.After measured, the average hardness of the former primary state of matrix is 410HV, and zone leveling hardness after laser melting coating impacts compounding technology reparation has reached 850HV0.3, hardening depth is 0.23 ~ 0.78mm, and carry out fatigue test to repairing test specimen, and contrast with processing is front, the cycle index while finding crack initiation has improved 1.5 times of left and right, thereby has improved greatly the fatigue lifetime of LED headlamp mould.Result of study shows, after this remediation intensification, part hardness and intensity significantly improve, its surface becomes compressive stress state from residual stress state from tensile stress, thus the performances such as its fatigue lifetime and wear resistance significantly improve, this over-all properties to LED headlamp mould is significant.
Claims (4)
1. a device that LED headlamp mould is carried out to laser reinforcing, it is characterized in that, comprise computer control treatment system, coaxial powder-feeding formula laser melting coating unit, laser impact intensified unit and back work system, described computer control treatment system comprises central control processor (1), carbon dioxide laser controller (5) and YAG pulsed laser controller (17); Described carbon dioxide laser controller (5) is all connected with described central control processor (1) with described YAG pulsed laser controller (17); Described coaxial powder-feeding formula laser melting coating unit comprises YAG pulsed laser (18), argon protective device (15), the first completely reflecting mirror (20), the first light pipe (19), adjustable powder feeder (16) and coaxial working head (21); Described YAG pulsed laser (18) is connected with described YAG pulsed laser controller (17), described argon protective device (15), described adjustable powder feeder (16) and described coaxial working head (21) are connected with described central control processor (1) respectively, described the first completely reflecting mirror (20), the first light pipe (19) and described coaxial working head (21) form light path transfer system, and the inner cladding powder of described adjustable powder feeder (16) is transported to workpiece to be processed surface by described coaxial working head (21); Described laser impact intensified unit comprises carbon dioxide laser (4), the second completely reflecting mirror (2), the second light pipe (3), light beam conversion and setting device (6); Described carbon dioxide laser (4) is connected with described carbon dioxide laser controller (5), and described carbon dioxide laser (4), the second completely reflecting mirror (2), the second light pipe (3), light beam conversion and setting device (6) form light path transfer system; Described back work system comprises five-axle linkage worktable (13), fixture (10) and worktable controller (14), described fixture is fixed on described five-axle linkage worktable (13), described five-axle linkage worktable (13) is connected with described worktable controller (14), and described worktable controller (14) is connected with described central control processor (1).
2. a kind of device that LED headlamp mould is carried out to laser reinforcing according to claim 1, is characterized in that, also comprises a surface profile scanner (7), and described surface profile scanner (7) is connected with described central control processor (1).
3. LED headlamp mould is carried out to a method for laser reinforcing, comprise the steps:
A: treat cladding LED headlamp die surface and carry out macroscopic test, determine the position of crackle, and remove oil stain and the dirt of die surface with alcohol or acetone;
B: processed good LED headlamp mould is put on five-axle linkage worktable, is located afterwards and fixes to clamp with fixture;
C: central control processor regulates five-axle linkage worktable by numerical control operating platform, make to treat that cladding LED headlamp mould is in coaxial working head below, central control processor sends and feeds back signal to YAG pulsed laser controller and coaxial working head, YAG pulsed laser produces pulse laser, through the first light pipe, coaxial working head, be irradiated to LED headlamp convex mould surface, the adjustable powder feeder of being controlled by central control processor is sent into molten bath by cladding powder through coaxial working head simultaneously, and starts argon protective device protection cladding powder with anti-oxidation;
D: after cladding layer is cooling, clean LED headlamp convex mould surface with alcohol, the dry rear pitch-dark absorption layer that applies;
E: central control processor sends and feeds back signal to carbon dioxide laser controller and light beam conversion and setting device, carbon dioxide laser produces continuous laser under the control of carbon dioxide laser controller, through the first light pipe, is irradiated on LED headlamp convex mould surface; Central control processor regulates five-axle linkage worktable under the effect of worktable controller simultaneously, completes the cladding of whole LED headlamp convex mould surface;
F: clean the pitch-dark of LED headlamp convex mould surface impact zone with alcohol or acetone;
G: the LED headlamp punch of having repaired is carried out to surfaceness check by central control processor control surface profile scanner, making to repair LED headlamp die surface roughness reaches below Ra3.2, as not reaching requirement, central control processor carries out secondary laser impact or polished finish to LED headlamp mould;
H: repair member is carried out to nondestructive testing.
4. a kind of method of LED headlamp mould being carried out to laser reinforcing according to claim 3, is characterized in that, adopts non-destructive test(ing)(NDT) detection method to determine to treat particular location, shape and the size of cladding LED headlamp mould inside crackle in steps A.
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| CN104673973A (en) * | 2015-02-10 | 2015-06-03 | 江苏大学 | Laser impact method for extrusion die key part |
| CN105803453A (en) * | 2016-04-22 | 2016-07-27 | 江苏大学 | Engine crankshaft fatigue crack laser repairing and strengthening device and method |
| CN106521101A (en) * | 2016-10-10 | 2017-03-22 | 深圳领威科技有限公司 | Method for promoting depression resistance of template surface and template surface strengthening equipment |
| CN109079323A (en) * | 2018-09-03 | 2018-12-25 | 广东工业大学 | The platform and method that the non-penetration laser weldering of aluminium alloy is strengthened |
| CN110283968A (en) * | 2019-07-31 | 2019-09-27 | 天津玛斯特车身装备技术有限公司 | A kind of mold surface hardening treatment with laser technique |
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Application publication date: 20140312 |