CN104233292A - Laser repair method adopting metal powder - Google Patents
Laser repair method adopting metal powder Download PDFInfo
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- CN104233292A CN104233292A CN201410526029.3A CN201410526029A CN104233292A CN 104233292 A CN104233292 A CN 104233292A CN 201410526029 A CN201410526029 A CN 201410526029A CN 104233292 A CN104233292 A CN 104233292A
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- high pressure
- sluice valve
- pressure sluice
- powder
- laser
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Abstract
A laser repair method adopting metal powder comprises the following steps of 1 determining device parameters; 2 detecting the damaged face of a workpiece; 3 positioning and detecting the workpiece; 4 performing heating, 5 performing bottoming; 6 repairing a first layer; 7 repairing a second layer; 8 performing cooling. By means of the laser repair method, a manufacture mode of a high-pressure sluice valve is developed, a traditional 'old for new' maintenance mode is changed, and the service life of the high-pressure sluice valve is prolonged on the basis that a larger amount of raw materials and costs are saved. The problem that cracks are easily produced under the conditions of thick coating, high powder hardness and large heat loss is solved.
Description
Technical field
The invention belongs to laser repairing field, specifically a kind of selection by metal-powder, according to the design of high pressure sluice valve trim surface features bridging method, realized the laser repair method of " regeneration " to losing efficacy or scrapping high pressure sluice valve trim.
Background technology
Laser repairing, i.e. laser melting and coating technique.The advantage of laser melting coating is mainly reflected in its energy density high concentration, and speed of cooling is exceedingly fast (up to 105 ~ 106K/s), has rapid solidification structure feature, is a kind of novel coating and process for modifying surface, is the important support of laser advanced machining technology.At present, laser melting and coating technique has become fabrication of new materials, metallic element manufactures fast, lost efficacy one of metallic element reparation and important means of manufacturing again, has been widely used in the industries such as aviation, petrochemical complex, automobile, machinofacture, boats and ships and Making mold.Compare with gas phase deposition technology with traditional built-up welding, spraying, plating, laser melting coating has extremely low thinning ratio, less pore and crack defect, dense structure, cladding layer becomes metallurgical binding with matrix, and cladding material scope is wide, powder size and the feature such as content is large.Laser melting coating not only can reduce manufacturing cost for repairing metallic element, can also shorten the manufacturing cycle, especially solves the rotatable parts rapid rush-repair difficult problem that must solve in the continuous reliability service of the great suite of equipment of large-lot producer.
Through the comprehensive debugging of the influence factor such as the choosing of metal-powder, overlapping mode, laser power, sweep velocity, can ensure not destroy on the basis of high pressure sluice valve bulk properties, farthest restore the performance on sealing surface of the discharge gate surface, meet service requirements.And the difficulty of this technique is: 1. the metal-powder hardness selected is all at more than 45HRC, and the thickness of coating lower than 2.5mm, easily can not form crackle; 2. gate valve base material is 25 steel, has higher thermal conductivity, and heat loss is fast, becomes the second crackle source of generation.
Summary of the invention
For above problem, the object of the present invention is to provide a kind of laser repair method adopting metal-powder, is that the two kind gate valves different to environment for use are repaired, and is for improving corrosion-proof wear under hot conditions with the coating of Co2F powder preparation; For improving its wear resistance and impact resistance with the coating of Fe45 powder preparation.
Object technical scheme of the present invention is achieved in the following ways: a kind of laser repair method adopting metal-powder, comprises the following steps: 1), determine device parameter; 2) workpiece perished surface detects; 3) fixture detection and localization; 4) heat; 5) bottoming; 6) the first layer reparation; 7) second layer reparation; 8) cool; It is characterized in that:
1), device parameter is determined: adopt the semiconductor pumped all solid state laser of 800 μm of optical fiber core diameters, collimating mirror 120mm, condensing lens 180mm as light source, adopt and carry small rotary turntable, clamping tooling fixture on it, then the high pressure sluice valve be repaired is fixed among frock clamp;
Described semiconductor pumped all solid state laser is the laser apparatus of 800 μm of optical fiber core diameters, collimating mirror 120mm, condensing lens 180mm;
2), workpiece perished surface detects: after removing the trim damaged tissue of high pressure sluice valve, carry out crack defect detection with tinting material to reparation position;
3), fixture detection and localization: adopt frock clamp to position detection to high pressure sluice valve;
4), heat: make process furnace be warming up to 500 DEG C, high pressure sluice valve is placed in stove inside holding 1 hour;
5), bottoming: after 1 hour, take out high pressure sluice valve, install to rapidly in preprepared frock clamp, first carry out bottoming operation with Fe20 or Fe45 powder at the trim damaged part of high pressure sluice valve by semiconductor pumped all solid state laser;
The processing parameter of described bottoming operation is: power 1600W, speed 600-750 mm/min, defocusing amount 25-37mm, powder feeding carrier gas rate 3L/min.
6), the first layer reparation: complete trim damaged part the first layer reparation to high pressure sluice valve with the processing parameter of power 1600W, speed 250mm/min, defocusing amount 25-37mm, powder feeding carrier gas rate 3L/min by semiconductor pumped all solid state laser Co2F or Fe45 powder, make damaged part substrate surface be the distribution of orderly wavy surface;
7), second layer reparation: again scanning filling is carried out to high pressure sluice valve damaged part wavy surface recessed portion with the processing parameter of power 1600W, sweep velocity 400-500mm/min, defocusing amount 25-37mm, powder feeding carrier gas rate 3L/min by semiconductor pumped all solid state laser Co2F or Fe45 powder, finally obtain high-flatness, surperficial flawless coating;
8), cooling: after having repaired, the high pressure sluice valve after repairing is placed in process furnace cools to room temperature with the furnace at 350 DEG C.
Advantage of the present invention and positively effect are: 1. expanded the manufacture of high pressure sluice valve, change the traditional maintenance pattern of " with new easily old ", save material in a large number with on the basis of cost, extend the work-ing life of high pressure sluice valve.2. solve because of the difficult problem that coating is thicker, powder hardness is higher and very easily crack when heat loss is larger.
Embodiment
Embodiment 1:
A method for Co2F powder preparation wear-and corrosion-resistant coating under 650 DEG C of-800 DEG C of conditions, gate valve base material is 25 steel, has following steps:
1, device parameter is determined: adopt the semiconductor pumped all solid state laser of 800 μm of optical fiber core diameters, collimating mirror 120mm, condensing lens 180mm as light source, adopt and carry small rotary turntable, clamping tooling fixture on it, then the high pressure sluice valve be repaired is fixed among frock clamp;
2, workpiece perished surface detects: after removing the trim damaged tissue of high pressure sluice valve, carries out crack defect detection with tinting material to reparation position;
3, fixture detects: adopt frock clamp to position detection to high pressure sluice valve;
4), heat: make process furnace be warming up to 500 DEG C, high pressure sluice valve is placed in stove inside holding 1 hour;
5), bottoming: after 1 hour, take out high pressure sluice valve, install to rapidly in preprepared frock clamp, first carry out bottoming operation with Fe20 powder at the trim damaged part of high pressure sluice valve by semiconductor pumped all solid state laser, its processing parameter is: power 1600W, speed 750 mm/min, defocusing amount 37mm, powder feeding carrier gas rate 3L/min;
6, the first layer reparation: complete trim damaged part the first layer reparation to high pressure sluice valve with the processing parameter of power 1600W, sweep velocity 250mm/min, defocusing amount 25-37mm, powder feeding carrier gas rate 3L/min by semiconductor pumped all solid state laser Co2F powder, make damaged part substrate surface be the distribution of orderly wavy surface;
7, second layer reparation: with Co2F powder, scanning filling is carried out to high pressure sluice valve damaged part wavy surface recessed portion with the processing parameter of power 1600W, sweep velocity 500mm/min, defocusing amount 37mm, powder feeding carrier gas rate 3L/min again by semiconductor pumped all solid state laser, finally obtain high-flatness, surperficial flawless coating;
8, cool: after having repaired, the high pressure sluice valve after repairing is placed in process furnace at 350 DEG C, cools to room temperature with the furnace.
Shown in the following list lattice 1 of its processing parameter;
Under table 1 650 DEG C of-800 DEG C of conditions, wear-and corrosion-resistant coating prepares Co
2f
| Road sequence | Power W | Speed mm/min | Defocusing amount mm | Powder feeding carrier gas rate L/min, |
| Fe 20 bottoming | 1600 | 750 | 37 | 3 |
| The first layer | 1600 | 250 | 37 | 3 |
| The second layer | 1600 | 500 | 37 | 3 |
Embodiment 2:
Adopt that Fe45 powder preparation is wear-resisting, a method for the coating of strong shock resistance, gate valve base material is 25 steel, has following steps:
1, device parameter is determined: adopt the semiconductor pumped all solid state laser of 800 μm of optical fiber core diameters, collimating mirror 120mm, condensing lens 180mm as light source, adopt and carry small rotary turntable, clamping tooling fixture on it, then the high pressure sluice valve be repaired is fixed among frock clamp;
2, workpiece perished surface detects: after removing the trim damaged tissue of high pressure sluice valve, carries out crack defect detection with tinting material to reparation position;
3, fixture detection and localization: adopt frock clamp to position detection to high pressure sluice valve;
4, heat: make process furnace be warming up to 500 DEG C, high pressure sluice valve is placed in stove inside holding 1 hour;
5, bottoming: after 1 hour, take out high pressure sluice valve, install to rapidly in preprepared frock clamp, first carry out bottoming operation with Fe45 powder at the trim damaged part of high pressure sluice valve by semiconductor pumped all solid state laser, its processing parameter is: power 1600W, speed 600 mm/min, defocusing amount 25mm, powder feeding carrier gas rate 3L/min;
6, the first layer reparation: complete trim damaged part the first layer reparation to high pressure sluice valve with the processing parameter of power 1600W, sweep velocity 250mm/min, defocusing amount 25mm, powder feeding carrier gas rate 3L/min by semiconductor pumped all solid state laser Fe45 powder, make damaged part substrate surface be the distribution of orderly wavy surface;
7, second layer reparation: with Fe45 powder, scanning filling is carried out to high pressure sluice valve damaged part wavy surface recessed portion with the processing parameter of power 1600W, sweep velocity 400mm/min, defocusing amount 25mm, powder feeding carrier gas rate 3L/min again by semiconductor pumped all solid state laser, finally obtain high-flatness, surperficial flawless coating;
8, cool: after having repaired, the high pressure sluice valve after repairing is placed in process furnace at 350 DEG C, cools to room temperature with the furnace.
Shown in the following list lattice 2 of its processing parameter:
Table 2 is wear-resisting, the coating of strong shock resistance prepares Fe45
| Road sequence | Power W | Speed mm/min | Defocusing amount mm | Powder feeding carrier gas rate L/min |
| Bottoming | 1600 | 600 | 25 | 3 |
| The second layer | 1600 | 250 | 25 | 3 |
| Third layer | 1600 | 400 | 25 | 3 |
The present invention must accomplish following 3 points in whole technical process: the first, must carry out preheating before reparation; The second, repairing efficiency must be short, avoids scattering and disappearing of heat; 3rd, must slow cooling after reparation.
Claims (3)
1. adopt a laser repair method for metal-powder, comprise the following steps: 1), determine device parameter; 2) workpiece perished surface detects; 3) fixture detection and localization; 4) heat; 5) bottoming; 6) the first layer reparation; 7) second layer reparation; 8) cool; It is characterized in that:
1), device parameter is determined: adopt the semiconductor pumped all solid state laser of 800 μm of optical fiber core diameters, collimating mirror 120mm, condensing lens 180mm as light source, adopt and carry small rotary turntable, clamping tooling fixture on it, then the high pressure sluice valve be repaired is fixed among frock clamp;
2), workpiece perished surface detects: after removing the trim damaged tissue of high pressure sluice valve, carry out crack defect detection with tinting material to reparation position;
3), fixture detection and localization: adopt frock clamp to position detection to high pressure sluice valve;
4), heat: make process furnace be warming up to 500 DEG C, high pressure sluice valve is placed in stove inside holding 1 hour;
5), bottoming: after 1 hour, take out high pressure sluice valve, install to rapidly in preprepared frock clamp, first Fe20 or Fe45 powder is carried out bottoming operation at the trim damaged part of high pressure sluice valve by semiconductor pumped all solid state laser;
6), the first layer reparation: complete trim damaged part the first layer reparation to high pressure sluice valve with the processing parameter of power 1600W, speed 250mm/min, defocusing amount 25-37mm, powder feeding carrier gas rate 3L/min by semiconductor pumped all solid state laser Co2F or Fe45 powder, make damaged part substrate surface be the distribution of orderly wavy surface;
7), second layer reparation: by semiconductor pumped all solid state laser, Co2F or Fe45 powder is carried out scanning filling to high pressure sluice valve damaged part wavy surface recessed portion again with the processing parameter of power 1600W, speed 400-500mm/min, defocusing amount 25-37mm, powder feeding carrier gas rate 3L/min, finally obtain high-flatness, surperficial flawless coating;
8), cooling: after having repaired, the high pressure sluice valve after repairing is placed in process furnace cools to room temperature with the furnace at 350 DEG C.
2. a kind of laser repair method adopting metal-powder according to claim 1, is characterized in that: the semiconductor pumped all solid state laser in described step 1) is the laser apparatus of 800 μm of optical fiber core diameters, collimating mirror 120mm, condensing lens 180mm.
3. a kind of laser repair method adopting metal-powder according to claim 1, is characterized in that: the processing parameter of bottoming operation in described step 5) is: power 1600W, speed 600-750 mm/min, defocusing amount 25-37mm, powder feeding carrier gas rate 3L/min.
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| CN201410526029.3A CN104233292A (en) | 2014-10-09 | 2014-10-09 | Laser repair method adopting metal powder |
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| CN201410526029.3A CN104233292A (en) | 2014-10-09 | 2014-10-09 | Laser repair method adopting metal powder |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108213713A (en) * | 2016-12-14 | 2018-06-29 | 北京有色金属研究总院 | A kind of thin-wall part combined-repair method for increasing material based on pulse laser and continuous laser |
| CN110280903A (en) * | 2019-07-01 | 2019-09-27 | 深圳市通发激光设备有限公司 | A kind of energy-saving semiconductor light source mold laser gain material repair system |
| CN114515837A (en) * | 2022-04-21 | 2022-05-20 | 北京煜鼎增材制造研究院有限公司 | Laser selective melting repair method for blade tip of single crystal turbine blade |
| CN114959684A (en) * | 2022-05-18 | 2022-08-30 | 广东核电合营有限公司 | Method for repairing sealing surface of main valve seat of valve |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102453904A (en) * | 2010-10-26 | 2012-05-16 | 沈阳大陆激光成套设备有限公司 | Method for preparing wear-resistant coating on surface of driving sheave race of elevator by laser cladding |
| CN102615431A (en) * | 2012-04-12 | 2012-08-01 | 中国人民解放军装甲兵工程学院 | Remanufacturing method for automatic laser cladding of gray cast iron cylinder cover |
-
2014
- 2014-10-09 CN CN201410526029.3A patent/CN104233292A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102453904A (en) * | 2010-10-26 | 2012-05-16 | 沈阳大陆激光成套设备有限公司 | Method for preparing wear-resistant coating on surface of driving sheave race of elevator by laser cladding |
| CN102615431A (en) * | 2012-04-12 | 2012-08-01 | 中国人民解放军装甲兵工程学院 | Remanufacturing method for automatic laser cladding of gray cast iron cylinder cover |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108213713A (en) * | 2016-12-14 | 2018-06-29 | 北京有色金属研究总院 | A kind of thin-wall part combined-repair method for increasing material based on pulse laser and continuous laser |
| CN110280903A (en) * | 2019-07-01 | 2019-09-27 | 深圳市通发激光设备有限公司 | A kind of energy-saving semiconductor light source mold laser gain material repair system |
| CN114515837A (en) * | 2022-04-21 | 2022-05-20 | 北京煜鼎增材制造研究院有限公司 | Laser selective melting repair method for blade tip of single crystal turbine blade |
| CN114959684A (en) * | 2022-05-18 | 2022-08-30 | 广东核电合营有限公司 | Method for repairing sealing surface of main valve seat of valve |
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Application publication date: 20141224 |