CN1923445A - Process for on-site restoring large-scale workpiece by utilizing pulsed YAG laser - Google Patents
Process for on-site restoring large-scale workpiece by utilizing pulsed YAG laser Download PDFInfo
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- CN1923445A CN1923445A CN 200610104531 CN200610104531A CN1923445A CN 1923445 A CN1923445 A CN 1923445A CN 200610104531 CN200610104531 CN 200610104531 CN 200610104531 A CN200610104531 A CN 200610104531A CN 1923445 A CN1923445 A CN 1923445A
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Abstract
The invention relates to a method for using impulse YAG solid laser to on site repair large work piece. Wherein, it comprise that cleaning needed part, repairing with YAG laser fusion, and machining; it uses impulse laser fusion technique to obtain deep repair with less energy, and higher power than present technique; and since the YAG laser fusion will not affect the non radiated part, it has high repair quality. The invention can use optical fiber to transmit impulse laser to the needed part, to realize on-site laser fusion repair and machining, to shorten period and save cost.
Description
Technical field
The present invention relates to a kind of workpiece recovery technique, relate in particular to a kind of method of utilizing pulsed YAG laser melting and coating technique on-site restoring large-scale workpiece.
Background technology
Since the reform and opening-up, external large quantities of advanced equipments of high grade and precision are introduced China, and many Important Project equipment costs are very expensive, in case occur damaging, production line interrupted.Particularly import equipment lacks spare part, and interim introduction not only costs an arm and a leg, and it is pressed for time, can not guarantee timely production, will cause great economic loss.Therefore, carry out great equipment reparation, develop quick, efficient, accurate recovery technique, not only have the vast market demand, and have great economic benefit and social benefit.
Domestic enterprise generally adopts argon arc welding, electric welding to carry out the reparation of large-scale workpiece and mould.In precision height, complex-shaped today, traditional restorative procedure more and more shows limitation: 1, large-scale workpiece and mould need be dismantled and deliver to the appointed place and repair; 2, often cause unpredictalbe defective: beat limit, pore, trachoma etc.; 3, workpiece and mould high annealing produce distortion; 4, production efficiency is low.
The laser melting coating recovery technique is the new and high technology that develops in recent ten years.The reparation of laser filler is meant after fault location is inserted particular solder in advance melts with the laser irradiation, forms the metallurgical binding between dissimilar metal and the same metal, realizes defective, crackle supply energy and the material of workpiece and mould are made it healing.Easy to wear or perishable position at machine, equipment, adopt laser at its surface cladding, cladding layer with excellent performance such as wear-resisting, anti-corrosion, heat-resisting, thereby can prolong the service life of machine, equipment greatly: under the condition that guarantees former accessory size and material property, piece surface to wearing and tearing is repaired, and realizes the utilization again of refuse.Laser melting coating recovery technique and traditional process for treating surface are compared as technology such as built-up welding, spraying plating, thermal spraying, surfacings, and laser surface treating technology has the following advantages: cladding layer and matrix can form firm metallurgical binding, the interface bond strength height; Can obtain the cladding layer of low dilution rate; Heat affected area and thermal deformation are little to make that workpiece deformation is little, automaticity is high; Laser Surface Treatment belongs to rapid solidification, obtains fine grained texture easily or forms cenotype that conventional treatment can't obtain or the like.
Present laser melting and coating technique adopts high power CO
2Laser equipment, the price height, the user is difficult to accept, and equipment is huge, is difficult to directly construction at the scene.
Because the peak power of pulsed YAG solid state laser can reach the requirement of high power laser light cladding fully, adopt optical fiber technology directly laser energy to be caused workpiece, when repairing so at the scene, workpiece even can dismantle.
Summary of the invention
The purpose of this invention is to provide a kind of method of utilizing the on-the-spot large-scale workpiece of pulsed YAG Solid State Laser.
Purpose of the present invention can realize by following measure:
A kind of method of utilizing the pulsed YAG laser on-site restoring large-scale workpiece may further comprise the steps:
1. repair the cleaning at position: with angle grinding machine cleaning hurt position formation V-type groove, up to spilling the metal true qualities;
2. laser melting coating reparation: metal dust is preset in the V-type groove of clearing up, adopt optical fiber that the pulsed YAG laser long-distance transmissions is scanned to the parallel planes of going forward side by side through the V-type groove of cleaning under inert gas shielding, pointwise is pursued the line laser cladding until obtaining the cladding cross section;
3. machine adds complex: utilize sander to repair the physical dimension of workpiece.
The frequency of described pulsed YAG laser is 1～200Hz, and pulsewidth 0.3～20ms, pulse current are 2～250A; The focal length of described pulsed YAG laser is 1～200mm, spot diameter 0.5～4mm; Sweep speed 1.1～5.0mm/s.
The shop powder thickness of described metal dust in the cleaning groove is 1～1.5mm.
Described inert protective gas is an argon gas, and its flow is 3～5L/min.
The present invention compares in prior art and has the following advantages:
1, the present invention utilizes the pulse laser melting and coating technique, can adopt less energy to obtain darker reparation, compares with external like product to have higher power; Because the YAG laser melting coating does not have non-laser irradiating part position or influences minimumly (to be generally 0.1～0.2mm), therefore, district's small workpiece thermal deformation of its heat affecting is little, repair the no cracking phenomena in back, the surface of the work that is repaired can reach the performance of former base material, and (bond strength of cladding layer and base material is not less than 90% of former base material, organizing of the thermal resistance of cladding layer and mother metal is very approaching, be pearlite+ferritic structure and do not have tangible tissue differences, cladding layer and Interface Microstructure densification thereof, smart grain is tiny, do not have hole, be mingled with, defective such as crackle; Laser cladding layer can be made up of multilayer.Bottom and matrix wellability are good, the bond strength height; The intermediate layer has certain intensity and hardness, and crack resistance is good; Performances such as surface layer has antiscour, and is wear-resistant and corrosion-resistant), repairing quality height.
2, the present invention utilizes in the YAG pulse laser repair process, and substrate temperature is no more than 40 ℃, does not have thermal deformation after the Laser Processing.
3, the present invention utilizes optical fiber that the YAG pulse laser is transferred to and repairs the position, has realized that on-the-spot laser melting coating reparation and machine add complex, has shortened repairing efficiency, has exempted handling labour and has made risk, has saved time, human and material resources to a great extent.
4, melting and coating technique controllability of the present invention is good, easily realizes automation control.
The specific embodiment
1, repairs the cleaning at position
Utilize grinding machine polishing cleaning hurt position, angle to form the V-type groove, make groove spill the metal true qualities.
2, laser melting coating reparation
Metal dust is preset at (shop powder thickness is 1～1.5mm), and laser is from the downward irradiation of processing head in the V-type groove of clearing up; The mobile tripod workbench of band laser Machining head is placed on the workpiece top that needs soldering, uses optical fiber that laser is directed to the work tripod from the laser work main frame, adopt the X-Y workbench to realize the flat scanning motion.
Specific practice is that laser head is fixed on the cantilever of X-Y workbench, makes laser head do plane motion with workbench, realizes the pointwise of soldering position is pursued the laser melting coating of line until obtaining a cladding cross section.
Wherein the technological parameter of laser melting coating is: the frequency of pulsed YAG laser is 1～200Hz, and pulsewidth 0.3～20ms, pulse current are 1～250A; The focal length of pulsed YAG laser is 1～200mm, spot diameter 0.5～4mm: sweep speed 1.1～5.0mm/s.
In order to make the performance at laser repairing interface, laser cladding process should carry out under the protection of inert gas.Here protective gas is an argon gas, and its flow is 3～5L/min.
3, machine adds complex
Use the polishing of factory's existing mechanical process equipment or oilstone, recover workpiece dimension.
Claims (4)
1, a kind of method of utilizing the pulsed YAG laser on-site restoring large-scale workpiece may further comprise the steps:
1. repair the cleaning at position: form the V-type groove, spill the metal true qualities with strand grinding machine polishing cleaning workpiece hurt position;
2. laser melting coating reparation: metal dust is preset in the V-type groove of clearing up, adopt optical fiber that the pulsed YAG laser long-distance transmissions is scanned to the parallel planes of going forward side by side through the V-type groove of cleaning under inert gas shielding, pointwise is pursued the line laser cladding until obtaining the cladding cross section;
3. machine adds complex: utilize sander to repair the physical dimension of workpiece.
2, utilize the method for pulsed YAG laser on-site restoring large-scale workpiece according to claim 1, it is characterized in that: the frequency of described pulsed YAG laser is 1～200Hz, and pulsewidth 0.3～20ms, pulse current are 2～250A; The focal length of described pulsed YAG laser is 1～200mm, spot diameter 0.5～4mm; Sweep speed 1.1～5.0mm/s.
3, utilize the method for pulsed YAG laser on-site restoring large-scale workpiece according to claim 1, it is characterized in that: the shop powder thickness of described metal dust in the cleaning groove is 1～1.5mm.
4, utilize the method for pulsed YAG laser on-site restoring large-scale workpiece according to claim 1, it is characterized in that: described inert protective gas is an argon gas, and its flow is 3～5L/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610104531 CN1923445A (en) | 2006-09-01 | 2006-09-01 | Process for on-site restoring large-scale workpiece by utilizing pulsed YAG laser |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610104531 CN1923445A (en) | 2006-09-01 | 2006-09-01 | Process for on-site restoring large-scale workpiece by utilizing pulsed YAG laser |
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| Publication Number | Publication Date |
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| CN1923445A true CN1923445A (en) | 2007-03-07 |
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| CN 200610104531 Pending CN1923445A (en) | 2006-09-01 | 2006-09-01 | Process for on-site restoring large-scale workpiece by utilizing pulsed YAG laser |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103273200A (en) * | 2013-03-21 | 2013-09-04 | 上海交通大学 | Laser cladding restoring method for die steel |
| CN105750818A (en) * | 2016-05-18 | 2016-07-13 | 哈尔滨电机厂有限责任公司 | Method for restoring large-size hydroelectric generating set top cover |
-
2006
- 2006-09-01 CN CN 200610104531 patent/CN1923445A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103273200A (en) * | 2013-03-21 | 2013-09-04 | 上海交通大学 | Laser cladding restoring method for die steel |
| CN105750818A (en) * | 2016-05-18 | 2016-07-13 | 哈尔滨电机厂有限责任公司 | Method for restoring large-size hydroelectric generating set top cover |
| CN105750818B (en) * | 2016-05-18 | 2017-12-19 | 哈尔滨电机厂有限责任公司 | The restorative procedure of Large Hydropower Station top cover |
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