CN105097381A - Laser shock life-prolonging method of tungsten electrode of short-arc lamp - Google Patents
Laser shock life-prolonging method of tungsten electrode of short-arc lamp Download PDFInfo
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- CN105097381A CN105097381A CN201410187970.7A CN201410187970A CN105097381A CN 105097381 A CN105097381 A CN 105097381A CN 201410187970 A CN201410187970 A CN 201410187970A CN 105097381 A CN105097381 A CN 105097381A
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Abstract
The invention discloses a laser shock life-prolonging method of the tungsten electrode of a short-arc lamp. The method comprises: cleaning a workpiece with deionized water, blow-drying the workpiece with nitrogen, and placing the dried workpiece in a drying box at the temperature of 100 degrees centigrade to dry the workpiece for 10 minutes; covering the operating end face of the tungsten electrode with an absorption layer to adsorb laser energy in order to prevent the laser from damaging the surface of the tungsten electrode; installing the tungsten electrode on a workbench and applying a constraint layer to the absorption layer in order to constrain an increase in the shrck force of a laser shock wave; performing pre-impact life-prolonging treatment and impact life-prolonging treatment by using a laser beam with a pulse width of 3 to 40ns, a wavelength of 532 or 1064nm, laser energy of 0.5 to 20J, repetition frequency of 0.1 to 10Hz, a laser beam diameter of 0.5 1o 10mm; removing the absorption layer coating the operating end face of the tungsten electrode; cleaning the workpiece with deionized water and blow-drying the workpiece with dry nitrogen in order to assemble the short-arc lamp. The laser shock life-prolonging method is simple in technology, obvious in life-prolonging effect, high in efficiency, low in cost, and little in pollution.
Description
Technical field
The present invention relates to fields such as being applied in industrial ultra-high voltage capillary mercury lamp, spherical short arc mercury xenon lamp and amusement/film industry globular short-arc xenon, be specifically related to a kind of short-arc lamp tungsten electrode laser-impact life-prolonging method.
Background technology
Tungsten has high-melting-point, high strength, high-modulus, high rigidity, the characteristic such as wear-resisting, corrosion-resistant, is used at present making filament, electric contact, the aspects such as thermocouple.Especially be widely used on ultrahigh-voltage short arc lamp.Ultrahigh-voltage short arc lamp is used for amusement/film industry and IC at present and equips industry, but causes the burn-out life of short-arc lamp generally on the low side due to superhigh pressure, high heat, and usually need frequent replacing in actual use, cause service efficiency on the low side, use cost is higher.Current tungsten electrode is lengthened the life multiplex tungsten alloys method, although better can improve the life-span of tungsten, relative cost is higher.
Summary of the invention
The object of this invention is to provide a kind of laser-impact life-prolonging method of short-arc lamp tungsten electrode, short-arc lamp tungsten electrode is increased the service life, and the method is simple to operate, and cost is low, green non-pollution, Be very effective of lengthening the life.
Technical scheme of the present invention is:
(1) finished surface covers absorbed layer: in clean room, cover in the operative end surface of tungsten electrode the absorbed layer that a layer thickness is 80-150 μm, and absorbed layer is the one in pitch-dark, aluminium foil or black tape;
(2) impose restriction layer: installed on the table by the tungsten electrode being coated with absorbed layer, absorbed layer applies the restraint layer that a layer thickness is 1-3mm, and restraint layer is the one in transparent glass or deionized water;
(3) tungsten electrode pre-impact life-extension treatment: the operative end surface of tungsten electrode is towards laser beam, take pulsewidth as 3-40ns, wavelength is 532nm or 1064nm, laser energy is 0.5-10J, repetition rate is 0.1-10Hz, laser beam that beam diameter is 0.5-10mm carries out pre-impact life-extension treatment, wherein hot spot overlapping rate is 0-50%, impacts 1-2 time;
(4) tungsten electrode impacts life-extension treatment: after pre-impact life-extension treatment, take pulsewidth as 3-40ns, wavelength is 532nm or 1064nm, laser energy is 1-20J (being generally 2 times of pre-impact life-extension treatment energy), repetition rate is 0.1-10Hz, laser beam that beam diameter is 0.5-10mm carries out impact life-extension treatment, wherein hot spot overlapping rate is 0-50%, impacts 2-6 time;
The present invention is before finished surface covers absorbed layer, and tungsten electrode surface needs to anticipate:
Put into by tungsten electrode and the supersonic cleaning machine that water temperature is 22 ± 2 DEG C of deionized waters is housed, supersonic frequency is 38-47kHz, cleaning 8-10min; Dry up with the drying nitrogen of 0.4-0.8MPa again, then put into the dry 10min of drying box of 100 DEG C;
The present invention, after tungsten electrode impacts life-extension treatment, need clean surface of the work:
Remove the absorbed layer of tungsten electrode operative end surface coating, put into be equipped with that temperature is 22 ± 2 DEG C, alcohol concentration is the supersonic cleaning machine of 75-95% by through impacting the tungsten electrode after life-extension treatment, supersonic frequency is 38-47kHz, cleaning 10-15min, then after utilizing deionized water rinsing 1-2min, dry up with the nitrogen of drying, short-arc lamp assembling can be given over to.
As described in step 3,4, the laser energy that wherein tungsten electrode pre-impact life-extension treatment uses impacts 1/2nd of the laser energy of life-extension treatment use for tungsten electrode.
The object that middle cleaning is anticipated on above-mentioned tungsten electrode surface is for ensureing not residual organic matter matter and the chip that early stage, tungsten electrode heat radiation screw chasing stayed on workpiece;
Dry object is for the stickup of subsequent absorption layer or coating are prepared, and improves the adhesion on absorbed layer and tungsten electrode surface.
The thickness requirement of the absorbed layer that above-mentioned steps 1 is pasted or applied is even, bubble-free between absorbed layer and tungsten electrode surface.
The restraint layer that above-mentioned steps 2 applies, if glass, requires that glass through the laser beam of wavelength 532nm and 1064nm, and can require closed seamless gap of fitting between glass and absorbed layer.If the restraint layer applied is deionized water, require that the thickness of layer of diw is even, without wave and splashing.
The more excellent condition of pre-impact life-extension treatment of the present invention and impact life-extension treatment is: the black tape after the operative end surface of tungsten electrode covers one deck 120 μm, then the deionized water restraint layer after black tape surface applies one deck 2mm, pre-impact life-extension treatment: the laser beam that pulsewidth is 12ns, wavelength is 1064nm, laser energy is 3.5J, repetition rate is 2Hz, beam diameter is 2mm carries out pre-impact life-extension treatment, wherein hot spot overlapping rate is 20%, impacts 1 time.Be 12ns again with pulsewidth, wavelength is 1064nm, laser energy is 7J, repetition rate is 2Hz, laser beam that beam diameter is 2mm carries out impact life-extension treatment, wherein hot spot overlapping rate is 20%, impacts 2 times.
Tungsten electrode of the present invention is cylindric, and cylindrical two ends all cut into the frustum of a cone (bottom surface of the frustum of a cone and cylindrical radial section form circular cone shape end face); One end is operative end surface, and it is plane; Tail end (other end away from operative end surface) is with the circular hole (blind hole) of conducting wire, and cylinder (outer surface of cylinder and the frustum of a cone) is provided with the radiating groove-heat radiation screw thread of screw-type.
Tungsten electrode operative end surface of the present invention refers to that electrion ionized gas produces the tungsten electrode surface of electric arc.
Of the present invention pitch-dark, black tape is opaque for the laser beam of 532nm or 1064nm, when laser beam irradiation is when pitch-dark, black tape is surperficial, pitch-dark, black tape can absorbing laser energy, produces the plasma of HTHP, and prevents laser beam to burn tungsten electrode surface.The 3M471 adhesive tape of such as 3M company, 3M425 adhesive tape, deer head 42m adhesive tape, the 4-1000 aluminum foil and adhesive tape of 3M company, large bridge model 600 pitch-dark.
Clean room of the present invention is ten thousand grades of clean rooms (being also called dust free room or clean room), and according to GB/T16292-1996, air purity grade scale is as table 1:
Air purity grade scale in table 1GB/T16292-1996
For reduce short-arc lamp lengthen the life processing cost, the present invention proposes laser-impact life-prolonging technique.Laser-impact life-prolonging technique is the laser irradiation metal surface of the high-energy-density utilizing short pulse, the absorbed layer of metal surface is (pitch-dark, aluminium foil, black tape etc.) vaporization of blasting property of absorbing laser energy, steam after vaporization sharply absorbing laser energy form high temperature, the plasma of high pressure, plasma suffers restraints layer (water, optical glass etc.) constraint, form high strength pressure surge, act on metal surface and propagate to metal inside, because this shock wave pressure is up to several GPa, its peak stress is far longer than the dynamic yield strength of material, make material surface that strong plastic deformation occur, cause distortion of lattice, dislocation and grain refinement, thus improve intensity and the hardness of metal surface, and then improve the useful life of workpiece.Short-arc lamp laser-impact life-prolonging technique, operating procedure is simple, be a kind of low cost, efficient, green life-prolonging technique.
Beneficial effect of the present invention is as follows:
1, lengthened the life by laser-impact, tungsten electrode surface microhardness can improve more than 20%;
2, lengthened the life by laser-impact, effectively can prevent the microcrack initiation on tungsten electrode surface;
3, lengthened the life by laser-impact, the useful life more than 30% of short-arc lamp can be improved;
4, lengthened the life by laser-impact, the blackening of short-arc lamp glass lamp can be slowed down, improve the stability of short-arc lamp high illumination.
Accompanying drawing explanation
Fig. 1 is that short-arc lamp tungsten electrode laser-impact of the present invention is lengthened the life process chart.
Embodiment
Embodiment 1
Material for test: the model of Shenzhen Kai Shi Electro-optical Technology, INC. (US) 62 Martin Road, Concord, Massachusetts 017 is the short arc mercury xenon lamp tungsten electrode of 5000R;
Put into by tungsten electrode and the supersonic cleaning machine that water temperature is 23 DEG C of deionized waters is housed, supersonic frequency is 40kHz, cleaning 9min;
Dry up with the nitrogen of the drying of 0.6MPa, then put into the dry 10min of drying box of 100 DEG C;
In ten thousand grades of clean rooms, cover in the operative end surface (front end) of tungsten electrode the absorbed layer black tape that a layer thickness is 120 μm;
Installed on the table by the tungsten electrode being coated with absorbed layer, the front end of tungsten electrode towards laser beam, and applies the thick restraint layer of a layer thickness 2mm on absorbed layer, and restraint layer selects deionized water;
Take pulsewidth as 12ns, wavelength is 1064nm, laser energy is 3.5J, repetition rate is 2Hz, laser beam that beam diameter is 2mm carries out pre-impact life-extension treatment, wherein hot spot overlapping rate is 20%, impacts 1 time;
Be 12ns again with pulsewidth, wavelength is 1064nm, laser energy is 7J, repetition rate is 2Hz, laser beam that beam diameter is 2mm carries out impact life-extension treatment, wherein hot spot overlapping rate is 20%, impacts 2 times;
Remove the absorbed layer of tungsten electrode operative end surface coating afterwards: tungsten electrode is put into temperature is housed is 24 DEG C, alcohol concentration is in the supersonic cleaning machine of 90%, and supersonic frequency is 40kHz, cleaning 10min, then dry up with dry nitrogen after utilizing deionized water rinsing 2min, give over to short-arc lamp assembling.
Embodiment 2
Material for test: the model of Shenzhen Kai Shi Electro-optical Technology, INC. (US) 62 Martin Road, Concord, Massachusetts 017 is the short arc mercury xenon lamp tungsten electrode of 5000R;
Put into by tungsten electrode and the supersonic cleaning machine that water temperature is 23 DEG C of deionized waters is housed, supersonic frequency is 40kHz, cleaning 9min;
Dry up with the nitrogen of the drying of 0.6MPa, then put into the dry 10min of drying box of 100 DEG C;
In ten thousand grades of clean rooms, cover in the operative end surface (front end) of tungsten electrode the absorbed layer aluminium foil that a layer thickness is 120 μm;
Installed on the table by the tungsten electrode being coated with absorbed layer, the front end of tungsten electrode towards laser beam, and applies the thick restraint layer of a layer thickness 2.5mm on absorbed layer, and restraint layer selects deionized water;
Take pulsewidth as 17ns, wavelength is 1064nm, laser energy is 4J, repetition rate is 2Hz, laser beam that beam diameter is 2mm carries out pre-impact life-extension treatment, wherein hot spot overlapping rate is 20%, impacts 1 time;
Be 17ns again with pulsewidth, wavelength is 1064nm, laser energy is 7.5J, repetition rate is 2Hz, laser beam that beam diameter is 2mm carries out impact life-extension treatment, wherein hot spot overlapping rate is 20%, impacts 2 times;
Remove the absorbed layer of tungsten electrode operative end surface coating afterwards: put into by tungsten electrode and be equipped with that temperature is 24 DEG C, alcohol concentration is the supersonic cleaning machine of 90%, supersonic frequency is 40kHz, cleaning 10min, dries up with dry nitrogen after then utilizing deionized water rinsing 2min, gives over to short-arc lamp assembling.
Embodiment 3
Material for test: the model of Shenzhen Kai Shi Electro-optical Technology, INC. (US) 62 Martin Road, Concord, Massachusetts 017 is the short arc mercury xenon lamp tungsten electrode of 5000R;
Put into by tungsten electrode and the supersonic cleaning machine that water temperature is 23 DEG C of deionized waters is housed, supersonic frequency is 40kHz, cleaning 9min;
Dry up with the nitrogen of the drying of 0.6MPa, then put into the dry 10min of drying box of 100 DEG C;
In ten thousand grades of clean rooms, covering a layer thickness in the operative end surface (front end) of tungsten electrode is that the absorbed layer of 120 μm is pitch-dark;
Installed on the table by the tungsten electrode being coated with absorbed layer, the front end of tungsten electrode towards laser beam, and applies the thick restraint layer of a layer thickness 3mm on absorbed layer, and restraint layer selects K47 transparent glass;
Take pulsewidth as 20ns, wavelength is 532nm, laser energy is 5J, repetition rate is 2Hz, laser beam that beam diameter is 2mm carries out pre-impact life-extension treatment, wherein hot spot overlapping rate is 20%, impacts 1 time;
Be 20ns again with pulsewidth, wavelength is 532nm, laser energy is 10J, repetition rate is 2Hz, laser beam that beam diameter is 2mm carries out impact life-extension treatment, wherein hot spot overlapping rate is 20%, impacts 2 times;
Remove the absorbed layer of tungsten electrode operative end surface coating afterwards: put into by tungsten electrode and be equipped with that temperature is 24 DEG C, alcohol concentration is the supersonic cleaning machine of 90%, supersonic frequency is 40kHz, cleaning 10min, dries up with dry nitrogen after then utilizing deionized water rinsing 2min, gives over to short-arc lamp assembling.
Embodiment 4
Short-arc lamp after above embodiment 1-3 process is done mixcrohardness test and life-saving test.
Mixcrohardness test: adopt FM-300 type digital micro-analysis hardness tester to measure the microhardness distribution of the laser impact intensified portion faces of test specimen, setting magnitude of load is 0.2N, and protecting the lotus time is 10s, 5 points surveyed by each sample, average, ambient temperature 22 ± 2 DEG C, ambient humidity 40-60%.
Life-saving is tested: on-load voltage 35V, loading current 140A, ambient temperature 22 ± 2 DEG C, ambient humidity 40-60%, lights rear continuous operation.
Above-described embodiment 1-3 short-arc lamp tungsten electrode surface microhardness and the life-span as shown in table 2.
The contrast in short-arc lamp microhardness and life-span before and after table 2 laser-impact
| Sequence number | Microhardness (HV) | Life-span (h) |
| Before non-shock treatment | 484 | 1532 |
| Embodiment 1 | 563 | 2587 |
| Embodiment 2 | 556 | 2453 |
| Embodiment 3 | 551 | 2367 |
Known from the test data of table 2, the tungsten electrode of short-arc lamp is after laser-impact, and microhardness is significantly improved, and useful life also significantly improves.
Claims (4)
1. a laser-impact life-prolonging method for short-arc lamp tungsten electrode, is characterized in that, comprise the steps:
(1) finished surface covers absorbed layer: in clean room, cover in the operative end surface of tungsten electrode the absorbed layer that a layer thickness is 80-150 μm, and absorbed layer is the one in pitch-dark, aluminium foil or black tape;
(2) impose restriction layer: installed on the table by the tungsten electrode being coated with absorbed layer, absorbed layer applies the restraint layer that a layer thickness is 1-3mm, and restraint layer is the one in transparent glass or deionized water;
(3) tungsten electrode pre-impact life-extension treatment: the operative end surface of tungsten electrode is towards laser beam, take pulsewidth as 3-40ns, wavelength is 532nm or 1064nm, laser energy is 0.5-10J, repetition rate is 0.1-10Hz, laser beam that beam diameter is 0.5-10mm carries out pre-impact life-extension treatment, wherein hot spot overlapping rate is 0-50%, impacts 1-2 time;
(4) tungsten electrode impacts life-extension treatment: after pre-impact life-extension treatment, take pulsewidth as 3-40ns, wavelength is 532nm or 1064nm, laser energy is 1-20J, repetition rate is 0.1-10Hz, laser beam that beam diameter is 0.5-10mm carries out impact life-extension treatment, wherein hot spot overlapping rate is 0-50%, impacts 2-6 time.
2. the laser-impact life-prolonging method of short-arc lamp tungsten electrode as claimed in claim 1, is characterized in that, before finished surface covers absorbed layer, tungsten electrode surface needs to anticipate:
Put into by tungsten electrode and the supersonic cleaning machine that water temperature is 22 ± 2 DEG C of deionized waters is housed, supersonic frequency is 38-47kHz, cleaning 8-10min;
Dry up with the drying nitrogen of 0.4-0.8MPa again, then put into the dry 10min of drying box of 100 DEG C.
3. the laser-impact life-prolonging method of short-arc lamp tungsten electrode as claimed in claim 1, is characterized in that, after tungsten electrode impacts life-extension treatment, cleans surface of the work:
Remove the absorbed layer of tungsten electrode operative end surface coating, put into be equipped with that temperature is 22 ± 2 DEG C, alcohol concentration is the supersonic cleaning machine of 75-95% by through impacting the tungsten electrode after life-extension treatment, supersonic frequency is 38-47kHz, cleaning 10-15min, then after utilizing deionized water rinsing 1-2min, dry up with the nitrogen of drying, short-arc lamp assembling can be given over to.
4. short-arc lamp tungsten electrode laser-impact life-prolonging method according to claim 1, is characterized in that: the laser energy that tungsten electrode pre-impact life-extension treatment uses impacts 1/2nd of the laser energy of life-extension treatment use for tungsten electrode.
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| CN111074061A (en) * | 2020-01-07 | 2020-04-28 | 山东大学 | Uniform surface strengthening method based on laser shock wave |
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