CN107723701A - Unimach rises and falls the electromagnetic agitation laser melting coating restorative procedure of frame member crackle - Google Patents
Unimach rises and falls the electromagnetic agitation laser melting coating restorative procedure of frame member crackle Download PDFInfo
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- CN107723701A CN107723701A CN201710785371.9A CN201710785371A CN107723701A CN 107723701 A CN107723701 A CN 107723701A CN 201710785371 A CN201710785371 A CN 201710785371A CN 107723701 A CN107723701 A CN 107723701A
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
- C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P6/00—Restoring or reconditioning objects
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Abstract
The invention belongs to laser gain material manufacture recovery technique field, it is related to a kind of unimach and rises and falls the electromagnetic agitation laser melting coating restorative procedure of frame member crackle, is mainly used in the reparation of undercarriage member upper surface crackle.The step of this method is：(1) laser melting coating material for repairing is prepared, (2) removing surface before repairing, the auxiliary laser cladding reparation of (3) electromagnetic agitation, (4) machining, (5) Non-Destructive Testing, complete after (6) stress relief annealing to repair.The average tensile strength of Direct Laser cladding reparation of the present invention is 1424.3MPa, and average elongation 11.5%, average impact toughness is 478KJ/m2, it is 464.6HV to repair metal average microhardness；The average tensile strength of electromagnetic agitation auxiliary laser cladding reparation is 1466.7MPa, and average elongation 15.1%, average impact toughness is 665KJ/m2, it is 491.4HV to repair metal average microhardness.It is controllable to repair rear part deformation, repairs position zero defect, restoring area temperature-room type plasticity and impact flexibility are more preferable, and extend the service life for the frame member that rises and falls.
Description
Technical field
The invention belongs to laser gain material manufacture recovery technique field, it is related to a kind of unimach and rises and falls frame member crackle
Electromagnetic agitation laser melting coating restorative procedure, it is mainly used in the reparation of undercarriage member upper surface crackle.
Background technology
For undercarriage when overhauling, there is micro-crack in the external surface of structural member such as undercarriage superhigh intensity Steel Piston Rod While, semiaxis,
Such crackle be during rising and falling frame member under arms by repeated stock and caused by fatigue crack, according to aircraft maintenance handbook
On quality inspection criterion, undercarriage belongs to key component, and the frame member that rises and falls of cracked defect does not allow installation to reuse.
But the unimach such as piston rod, semiaxis rises and falls, frame member belongs to the non-quick-wear part of large scale, renewal cost it is extremely expensive and
The new part production cycle is longer, it is difficult to meet the requirement of complete machine maintenance cycle, and compared to accessory size, these crack defect chis
It is very little very small, therefore be badly in need of a kind of reliable recovery technique and it is repaired.
Currently for the type part, optional recovery technique is argon arc welding and laser melting coating, but due to argon arc welding heat input
Higher, heat affected area is larger, can cause matrix material hydraulic performance decline, while can produce higher residual stresses, causes workpiece to deform
With repair metal cracking, and there is the phenomenon being attached thereto more than mating component in the frame member that rises and falls, to the dimension precision requirement of itself
It is very high, argon arc welding repair when it is caused deformation and cracking be not allowed to, furthermore, this rise and fall frame material all for 300M,
The unimach such as 30CrMnSiNi2A, weldability is poor, therefore should not use argon arc for the maintenance of piston rod vital part
Soldering soldering method；Laser powder-filled recovery technique provides new way for the solution of this problem.
The content of the invention
Matrix material performance and the small superelevation of caused residual stress can be kept it is an object of the invention to provide a kind of
Strength steel is risen and fallen the electromagnetic agitation laser melting coating restorative procedure of frame member crackle.
The present invention technical solution be：
The step of this method is：
(1) laser melting coating material for repairing is prepared, is prepared into using PREP or argon gas atomization method
Metal dust, it is desirable to which powder size is 53 μm~106 μm, powder sphericity >=90%, hollow powder rate≤0.1%, inclusion rates≤5
/ 200g, and size≤100 μm being mingled with；
(2) removing surface before repairing, under fluorescent light, polishing remove crack defect, and visual inspection unstressed configuration is shown, is removed
After crackle, 90 ° of gap opened angle=, with wire wheel polishing grinding surface, finally cleaned with acetone or alcohol；
(3) electromagnetic agitation auxiliary laser cladding reparation, it is extensive using electromagnetic agitation+synchronous powder feeding system formula laser melting coating complex method
The size of multiple defective locations, i.e., in laser melting coating repair process, a low frequency electromagnetic agitator is set around molten bath to moving
Stirred in real time in dynamic molten bath；After cladding terminates, visual inspection gap position fills up, and leaves adding not less than 0.5mm
Spare time measures, and the technological parameter of laser melting coating reparation is：Laser power 500W~800W, 0.3~0.8mm of spot diameter, speed 400
~600mm/min, 0.8~2.0rpm of powder feeding rate, 5~10L/min of powder feeding gas, 10~15L/min of protective gas；Electromagnetic agitation
Technological parameter be：Induction frequencies are 5Hz, and electric current is 0.5A~3A；Laser cladding process uses multilayer cladding, thickness in monolayer control
System is between 0.1~0.5mm, in repair process, holds temperature measurer using contact, control is repaired position matrix temperature rise nearby and existed
Within 150 DEG C；
(4) it is machined, restoring area is processed using modes such as car, milling, pincers, recovers accessory size, meets matching requirements；
(5) Non-Destructive Testing, using fluorescent penetrating inspection and X ray method, laser repairing position and its peripheral region are examined
Look into, it is desirable to the defects of flawless, incomplete fusion and stomata；
(6) stress relief annealing, using crawler type ceramic heat band, local destressing annealing is carried out to laser repairing region,
The residual stress of restoring area is eliminated, heat treating regime is：230 DEG C × 2h, air cooling；
Room temperature impact toughness >=420KJ/m of the laser melting coating material for repairing of the preparation2, temperature-room type plasticity >=
10.8%.
Laser melting coating material for repairing mechanical properties >=1400MPa of the preparation.
The present invention has the advantage that and beneficial effect
The performance of unimach is more sensitive to temperature, when being influenceed by comparative high temperature, such material it is strong
Degree, which occurs, to be greatly lowered.When being repaired using the relatively large argon arc welding method of input quantity, superhigh intensity steel member base
(region changed close to tissue on the matrix for repairing position, the tensile strength in this region occur for the heat affected area of body
It is greatly lowered) it is relatively large, component performance is had a great influence.Therefore using the laser melting coating that heat input is small, cooling velocity is fast
When method is repaired, the heat affected area depth of matrix can be effectively controlled, the region of matrix strength performance reduction is greatly decreased.But
Due to rapid melting and solidification process in laser cladding process, a small amount of gas and slag inclusion in molten bath is caused to have little time to overflow and stay in cladding layer
It is middle to form micro- stomata and dreg defect, cause the performances such as the repair layer plasticity of cladding obvious reduce occur.
Electromagnetic agitation auxiliary laser cladding is a kind of compound increasing material manufacturing restorative procedure, has both inherited laser melting coating reparation
The energy density of advantage, i.e. laser beam is high, and heating and cooling velocity are fast, and the heat affecting to base material is smaller, and substrate performance is influenceed
It is smaller, cause the deformation of workpiece small；Controllable 0.1~the 2.0mm of single track forming thickness；By dosing different powder, can significantly improve
The performance such as anti-corrosion, wear-resisting of substrate material surface.Meanwhile the electromagnetic agitation processing for aiding in repairing is made with strong agitation molten pool
With on the one hand helping speed up gas overflowing speed in molten bath, avoid the appearance of micro- stomata in surface fused coating；On the other hand have
Help improve the homogeneity of ingredients and crystal grain thinning in molten bath, so as to significantly improve the internal metallurgical quality and mechanical property of repairing position
Energy.
Advantage of the invention based on electromagnetic agitation auxiliary laser melting and coating technique, early stage is using same " deposited metals impact
Toughness >=420KJ/m2, temperature-room type plasticity >=10.8%, mechanical properties >=1400MPa " reparation metal dust is in 300M
Direct Laser cladding reparation and electromagnetic agitation auxiliary laser cladding repairing test are carried out on unimach test plate (panel), respectively to this
Room temperature tensile, room temperature impact and the microhardness performance of two kinds of reparation joints are tested.Experimental result shows, Direct Laser
The average tensile strength of cladding reparation is 1424.3MPa, and average elongation 11.5%, average impact toughness is 478KJ/m2,
It is 464.6HV to repair metal average microhardness；The average tensile strength of electromagnetic agitation auxiliary laser cladding reparation is
1466.7MPa, average elongation 15.1%, average impact toughness are 665KJ/m2, repairing metal average microhardness is
491.4HV.As can be seen here, reparation can be significantly improved by repairing superhigh intensity steel member using electromagnetic agitation auxiliary laser melting and coating technique
The temperature-room type plasticity and impact flexibility of joint, and greatly improving with temperature-room type plasticity and impact flexibility, it will help reduce clothes
Tearing tendency during labour, fatigue strength is improved, so as to improve the extension service life after repairing.
Therefore the achievement of the invention can be directly used for the reparation of aircraft unimach undercarriage Component Crack Defect, be winged
Machine is overhauled cost-effective, also provides technical support to occur Similar Problems on aircraft.
Embodiment
Technical solution of the present invention is described in further detail below with reference to example：
According to the installation position of undercarriage piston rod to be repaired aboard, analysis need to repair the force-bearing situation at position and split
Line situation and reason, confirm construction material composition, manufacturing process and structure composition, clearly require the repair materials of selection, pass through
Analyze and confirm above, implement step in detail below：
The step of this method is：
(1) laser melting coating material for repairing is prepared, is prepared into using PREP or argon gas atomization method
Metal dust, it is desirable to which powder size is 53 μm~106 μm, powder sphericity >=90%, hollow powder rate≤0.1%, inclusion rates≤5
/ 200g, and size≤100 μm being mingled with；These parameters of powder ensure that powder has good mobility so that laser melts
It is not in stifled powder phenomenon during covering；
(2) removing surface before repairing, under fluorescent light, crack defect is removed using hand-held electric rifle polishing, visually inspects nothing
Fluorescence display, after removing crackle, 90 ° of gap opened angle=, with wire wheel polishing grinding surface, finally cleaned, prevented with acetone
Only repair surface and the pollutants such as greasy dirt be present；
(3) electromagnetic agitation auxiliary laser cladding reparation, it is extensive using electromagnetic agitation+synchronous powder feeding system formula laser melting coating complex method
The size of multiple defective locations, i.e., in laser melting coating repair process, a low frequency electromagnetic agitator is set around molten bath to moving
Stirred in real time in dynamic molten bath；After cladding terminates, visual inspection gap position fills up, and leaves adding not less than 0.5mm
Spare time measures, and the technological parameter of laser melting coating reparation is：Laser power 500W~800W, 0.3~0.8mm of spot diameter, speed 400
~600mm/min, 0.8~2.0rpm of powder feeding rate, 5~10L/min of powder feeding gas, 10~15L/min of protective gas；Electromagnetic agitation
Technological parameter be：Induction frequencies are 5Hz, and electric current is 0.5A~3A；Laser cladding process uses multilayer cladding, thickness in monolayer control
System is between 0.1~0.5mm, in repair process, holds temperature measurer using contact, control is repaired position matrix temperature rise nearby and existed
Within 150 DEG C, to prevent matrix from the phase transformation of matrix large area and strength character decline occur because temperature is too high；
(4) it is machined, restoring area is processed using modes such as car, milling, pincers, recovers accessory size, meets matching requirements；
(5) Non-Destructive Testing, using fluorescent penetrating inspection and X ray method, laser repairing position and its peripheral region are examined
Look into, it is desirable to the defects of flawless, incomplete fusion and stomata；
(6) stress relief annealing, using crawler type ceramic heat band, local destressing annealing is carried out to laser repairing region,
The residual stress of restoring area is eliminated, heat treating regime is：230 DEG C × 2h, air cooling；
The laser melting coating material for repairing of preparation, the material have a good weldability, i.e., room temperature impact toughness >=
420KJ/m2, temperature-room type plasticity >=10.8%；Simultaneously using the material laser cladding sample mechanical properties >=
1400MPa, to ensure that the performance for repairing metal disclosure satisfy that the technical requirements of superhigh intensity steel member reparation.
Example one
Certain type undercarriage piston rod crack defect is repaired using electromagnetic agitation laser melting coating recovery technique, specific steps are such as
Under：
1. undercarriage piston rod cracks confirm
Aircraft undercarriage piston rod, material is 300M unimach, at undercarriage piston rod Upper shaft sleeve cooperation
There is long 4mm, deep 3mm crackle in lip flange.
2. repair process and inspection
(1) it is about 600KJ/m to select room temperature impact toughness2, temperature-room type plasticity about 15%, tensile strength be about 1450MPa's
High Cr-Ni steel alloys metal dust is prepared into metal as laser repairing material, and using PREP technology
Powder, 53 μm~90 μm of powder size scope, powder sphericity>90%, hollow powder rate<0.1%, inclusion rates are about 4/
200g；
(2) removing surface before repairing, under fluorescent light, crack defect is removed using hand-held electric rifle polishing, visually inspects nothing
Fluorescence display, after removing crackle, 90 °, deep 4.5mm, wide 9mm suitable for reading of gap opened angle, with wire wheel polishing grinding surface, most
Cleaned afterwards with acetone；
(3) electromagnetic agitation auxiliary laser cladding reparation, it is extensive using electromagnetic agitation+synchronous powder feeding system formula laser melting coating complex method
The size of multiple defective locations, after cladding terminates, visual inspection gap position fills up, and leaves 0.5mm allowance, laser
The technological parameter of cladding reparation is：Laser power 600W, spot diameter 0.8mm, speed 600mm/min, powder feeding rate 1.5rpm,
Powder feeding gas 5L/min, protective gas 15L/min；The technological parameter of electromagnetic agitation is：Induction frequencies are 5Hz, electric current 1.5A；Swash
Light repairs thickness in monolayer about 0.3mm, in repair process, holds temperature measurer using contact, position matrix temperature nearby is repaired in control
Rise within 150 DEG C.
(4) it is machined, restoring area is processed by the way of car+pincers, recovers accessory size, meet matching requirements；
(5) Non-Destructive Testing, using fluorescent penetrating inspection and X ray method, laser repairing position and its peripheral region are examined
Look into, testing result shows flawless, incomplete fusion and the defects of stomata；
(6) stress relief annealing, using crawler type ceramic heat band, local destressing annealing is carried out to laser repairing region,
The residual stress of restoring area is eliminated, heat treating regime is：230 DEG C × 2h, air cooling.
Compared with prior art, using undercarriage piston rod flawless, stomata and the slag inclusion of technical solution of the present invention reparation
Defect, deformation is controllable, can meet matching requirements, and process operation is convenient, and process stabilizing is reproducible, technology maturation.Can carry out
It is widely popularized.
Claims (3)
- The electromagnetic agitation laser melting coating restorative procedure of frame member crackle 1. a kind of unimach rises and falls, it is characterised in that：The party The step of method, has：(1) laser melting coating material for repairing is prepared, metal is prepared into using PREP or argon gas atomization method Powder, it is desirable to powder size is 53 μm~106 μm, powder sphericity >=90%, hollow powder rate≤0.1%, inclusion rates≤5/ 200g, and size≤100 μm being mingled with；(2) removing surface before repairing, under fluorescent light, polishing remove crack defect, and visual inspection unstressed configuration is shown, removes crackle Afterwards, 90 ° of gap opened angle=, with wire wheel polishing grinding surface, finally cleaned with acetone or alcohol；(3) electromagnetic agitation auxiliary laser cladding reparation, recover to lack using electromagnetic agitation+synchronous powder feeding system formula laser melting coating complex method The size of position is fallen into, i.e., in laser melting coating repair process, a low frequency electromagnetic agitator is set around molten bath to mobile Stirred in real time in molten bath；After cladding terminates, visual inspection gap position fills up, and leaves more than the processing not less than 0.5mm Amount, the technological parameter of laser melting coating reparation are：Laser power 500W~800W, 0.3~0.8mm of spot diameter, speed 400~ 600mm/min, 0.8~2.0rpm of powder feeding rate, 5~10L/min of powder feeding gas, 10~15L/min of protective gas；Electromagnetic agitation Technological parameter is：Induction frequencies are 5Hz, and electric current is 0.5A~3A；Laser cladding process uses multilayer cladding, thickness in monolayer control Between 0.1~0.5mm, in repair process, temperature measurer is held using contact, control is repaired position matrix temperature rise nearby and existed Within 150 DEG C；(4) it is machined, restoring area is processed using modes such as car, milling, pincers, recovers accessory size, meets matching requirements；(5) Non-Destructive Testing, using fluorescent penetrating inspection and X ray method, laser repairing position and its peripheral region are checked, The defects of asking flawless, incomplete fusion and stomata；(6) stress relief annealing, using crawler type ceramic heat band, local destressing annealing is carried out to laser repairing region, eliminated The residual stress of restoring area, heat treating regime are：230 DEG C × 2h, air cooling.
- The electromagnetic agitation laser melting coating reparation side of frame member crackle 2. a kind of unimach according to claim 1 rises and falls Method, it is characterized in that：Room temperature impact toughness >=420KJ/m of the laser melting coating material for repairing of the preparation2, temperature-room type plasticity >= 10.8%.
- The electromagnetic agitation laser melting coating reparation side of frame member crackle 3. a kind of unimach according to claim 2 rises and falls Method, it is characterized in that：Laser melting coating material for repairing mechanical properties >=1400MPa of the preparation.
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| CN201710785371.9A CN107723701A (en) | 2017-09-04 | 2017-09-04 | Unimach rises and falls the electromagnetic agitation laser melting coating restorative procedure of frame member crackle |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109604586A (en) * | 2019-01-03 | 2019-04-12 | 南京钢铁股份有限公司 | A kind of black material of 3D printing reparation and method suitable for rolled steel |
| CN110171578A (en) * | 2019-04-15 | 2019-08-27 | 广州飞机维修工程有限公司 | A kind of undercarriage high-strength steel part overhauls method |
| CN110303280A (en) * | 2019-07-26 | 2019-10-08 | 浙江开诚机械有限公司 | Large casting defect repairs local preheating's method |
| CN110549692A (en) * | 2019-08-02 | 2019-12-10 | 中航复合材料有限责任公司 | ultraviolet fluorescent tracing layer for displaying low-speed impact damage of composite material |
| CN110552005A (en) * | 2019-09-26 | 2019-12-10 | 航发优材(镇江)增材制造有限公司 | Valve body multi-surface continuous abrasion fixing device and laser repairing method |
| CN113245551A (en) * | 2021-06-10 | 2021-08-13 | 北京煜鼎增材制造研究院有限公司 | Laser additive repair method for 300M steel aircraft landing gear |
| CN113500351A (en) * | 2021-05-27 | 2021-10-15 | 沈阳北方飞机维修有限公司 | Maintenance method for corrosion cracks on main wheel of airplane |
| CN113878119A (en) * | 2021-09-18 | 2022-01-04 | 航发优材(镇江)增材制造有限公司 | Laser direct deposition repair method for abrasion of tight-lock coupler for high-speed rail |
| CN114381728A (en) * | 2021-12-06 | 2022-04-22 | 中车株洲电机有限公司 | Laser cladding repair method for shaft parts |
| WO2023056663A1 (en) * | 2021-10-09 | 2023-04-13 | 华南理工大学 | Method for repairing crack on surface of steel structure by additive manufacturing |
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| CN109604586B (en) * | 2019-01-03 | 2021-08-10 | 南京钢铁股份有限公司 | 3D printing repairing ink material and method suitable for rolled steel |
| CN109604586A (en) * | 2019-01-03 | 2019-04-12 | 南京钢铁股份有限公司 | A kind of black material of 3D printing reparation and method suitable for rolled steel |
| CN110171578A (en) * | 2019-04-15 | 2019-08-27 | 广州飞机维修工程有限公司 | A kind of undercarriage high-strength steel part overhauls method |
| CN110171578B (en) * | 2019-04-15 | 2022-05-31 | 广州飞机维修工程有限公司 | Method for overhauling high-strength steel part of aircraft landing gear |
| CN110303280A (en) * | 2019-07-26 | 2019-10-08 | 浙江开诚机械有限公司 | Large casting defect repairs local preheating's method |
| CN110549692A (en) * | 2019-08-02 | 2019-12-10 | 中航复合材料有限责任公司 | ultraviolet fluorescent tracing layer for displaying low-speed impact damage of composite material |
| CN110552005A (en) * | 2019-09-26 | 2019-12-10 | 航发优材(镇江)增材制造有限公司 | Valve body multi-surface continuous abrasion fixing device and laser repairing method |
| CN113500351A (en) * | 2021-05-27 | 2021-10-15 | 沈阳北方飞机维修有限公司 | Maintenance method for corrosion cracks on main wheel of airplane |
| CN113245551A (en) * | 2021-06-10 | 2021-08-13 | 北京煜鼎增材制造研究院有限公司 | Laser additive repair method for 300M steel aircraft landing gear |
| CN113245551B (en) * | 2021-06-10 | 2021-10-01 | 北京煜鼎增材制造研究院有限公司 | Laser additive repair method for 300M steel aircraft landing gear |
| CN113878119A (en) * | 2021-09-18 | 2022-01-04 | 航发优材(镇江)增材制造有限公司 | Laser direct deposition repair method for abrasion of tight-lock coupler for high-speed rail |
| WO2023056663A1 (en) * | 2021-10-09 | 2023-04-13 | 华南理工大学 | Method for repairing crack on surface of steel structure by additive manufacturing |
| CN114381728A (en) * | 2021-12-06 | 2022-04-22 | 中车株洲电机有限公司 | Laser cladding repair method for shaft parts |
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Application publication date: 20180223 |