CN202323028U - Vibrating device for inhibiting cracks of laser cladding layer - Google Patents
Vibrating device for inhibiting cracks of laser cladding layer Download PDFInfo
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- CN202323028U CN202323028U CN2011204229308U CN201120422930U CN202323028U CN 202323028 U CN202323028 U CN 202323028U CN 2011204229308 U CN2011204229308 U CN 2011204229308U CN 201120422930 U CN201120422930 U CN 201120422930U CN 202323028 U CN202323028 U CN 202323028U
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- vibrating
- vibration
- laser cladding
- cladding layer
- electromagnetic
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- 238000004372 laser cladding Methods 0.000 title claims abstract description 44
- 230000002401 inhibitory effect Effects 0.000 title abstract 2
- 238000012545 processing Methods 0.000 claims abstract description 28
- 239000000523 sample Substances 0.000 claims abstract description 12
- 208000037656 Respiratory Sounds Diseases 0.000 claims description 26
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 11
- 230000006698 induction Effects 0.000 claims description 10
- 230000005764 inhibitory process Effects 0.000 claims description 10
- 230000010355 oscillation Effects 0.000 claims description 9
- 230000007246 mechanism Effects 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 30
- 230000008569 process Effects 0.000 abstract description 20
- 229910052751 metal Inorganic materials 0.000 abstract description 7
- 239000002184 metal Substances 0.000 abstract description 7
- 230000008901 benefit Effects 0.000 abstract description 4
- 230000001939 inductive effect Effects 0.000 abstract 2
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 238000005253 cladding Methods 0.000 description 30
- 238000000576 coating method Methods 0.000 description 16
- 239000011159 matrix material Substances 0.000 description 16
- 230000008018 melting Effects 0.000 description 14
- 239000011248 coating agent Substances 0.000 description 13
- 238000002844 melting Methods 0.000 description 12
- 239000000843 powder Substances 0.000 description 11
- 238000005516 engineering process Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 230000035882 stress Effects 0.000 description 7
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- 239000000758 substrate Substances 0.000 description 6
- 239000000956 alloy Substances 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N argon Substances [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 5
- 239000011521 glass Substances 0.000 description 5
- 238000005728 strengthening Methods 0.000 description 5
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 230000008030 elimination Effects 0.000 description 4
- 238000003379 elimination reaction Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 230000001360 synchronised effect Effects 0.000 description 4
- 229910052786 argon Inorganic materials 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000010309 melting process Methods 0.000 description 3
- 238000002203 pretreatment Methods 0.000 description 3
- 238000007712 rapid solidification Methods 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 229910052761 rare earth metal Inorganic materials 0.000 description 2
- 238000005480 shot peening Methods 0.000 description 2
- 238000010583 slow cooling Methods 0.000 description 2
- 238000004381 surface treatment Methods 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- 229910052779 Neodymium Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
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- 230000008021 deposition Effects 0.000 description 1
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- 238000010438 heat treatment Methods 0.000 description 1
- 239000012761 high-performance material Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
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Abstract
The utility model relates to a vibrating device for inhibiting cracks of a laser cladding layer, and belongs to the technical field of laser processing equipment. The vibrating device consists of an electromagnetic vibrating table and a vibrating control system; the electromagnetic vibrating table comprises a machine body, an electromagnetic vibrating device, a vibrating objective table top arranged on the electromagnetic vibrating device, a clamp device arranged on the vibrating objective table top, and a vibrating control circuit; the vibrating control system comprises a display, a signal processing and controlling device, a power amplifier and a vibrating inductive probe; the display is connected with the signal processing and controlling device; the output end of the signal processing and controlling device is connected with the control signal input end of the electromagnetic vibrating table through the power amplifier; and the vibrating inductive probe is connected with the signal processing and controlling device. The device has the advantages of simple structure, convenience in use, capability of effectively improving the microstructure and the performance of the laser cladding layer when the device is used for assisting high-frequency low-amplitude vibration in the laser cladding process and the like, and is applied in the fields of laser cladding formation and repair of metal parts, laser cladding surface enhancement and the like.
Description
Technical field
The utility model relates to a kind of vibrating device that suppresses the laser cladding layer crackle, and specifically a kind of supplementary unit that is used for refinement laser cladding layer microtexture crystal grain, suppresses the crackle generation belongs to the laser process equipment technical field.
Background technology
Laser melting coating is a kind of surface strengthening technology that rises along with the laser technology development last century end.It is to add needed cladding material at substrate surface; Utilize high-energy-density laser beam rapid heating; Cladding material and substrate top layer are melted simultaneously, and realize rapid solidification, present metallurgical binding and the extremely low top coat of thinning ratio thereby form with substrate through the chilling action of substrate.Because of laser melting coating has applying flexible, little, the hot input of power consumption is lower; The thermal distortion that causes is less; Do not need following process or amount of finish very little; Reduce advantages such as public hazards, laser melting and coating technique receives the attention of height over past ten years aspect material surface modifying, in industries such as car industry, aerospace industry, oil, mould, is widely used.Also there is the defective that needs to be resolved hurrily in laser melting and coating technique when having numerous advantage.At first, there is the rapid solidification behavior in the bigger thermograde of bonding interface existence owing to base material in the laser cladding process and cladding layer perpendicular to the bonding surface direction, and tissue signature is epitaxially grown thick dentrite, is unfavorable for the mechanical property of cladding layer; Secondly; The difference that thermal expansivity is arranged between base material and the cladding powder also causes having produced unrelieved stress in the process of rapid solidification, is prone to cause the cladding layer macrocrack; Crackle in the big area cladding process is in case produce; Just can be to the cladding layer expansion of follow-up overlap joint, the mechanical property on cladding layer surface will decline to a great extent, even can cause scrapping of whole machining process part.Therefore, the crack problem of cladding layer is the important factor that this technology of restriction further moves towards the industrialization and uses always.
Warp finds that the main method at field of laser cladding inhibition and elimination crackle has substrate preheating and slow cooling, in the cladding powder, adds REE, adjusting process parameter etc. at present both at home and abroad to the pertinent literature retrieval of publishing.Preheating and slow cooling are subject to such environmental effects in the aforesaid method; The method same sex of adding REE is relatively poor; Suitable processing parameter needs obtain through lot of test, and processing parameter and the crackle number in the cladding layer exist the relation of complicacy, and the variation of several kinds of processing parameters all can exert an influence to crack number; Certain limitation is arranged, be unfavorable for promoting the use of.People such as the Deng Qilin of Shanghai Communications University, Song Jianli have proposed in patent CN1737197A " crack controlling means of laser deposition formed metal parts " through to the closed-loop control of laser cladding forming bath temperature and/or in forming process, introduce ultrasonic vibration; Reduce residual thermal stress, suppress and the elimination crackle.But the exciting force that this technology provides is less, can only improve the cladding layer quality to a certain extent.People such as the Zhou Jianzhong of Jiangsu University, Jiang Suqin have proposed use coaxial powder-feeding formula fast Axial-flow CO in patent CN101392382A " a kind of method and apparatus of strengthening surface modification by combination of laser cladding and laser peening "
2The laser melting coating unit is in matrix surface cladding one deck coating; With neodymium glass pulse laser shot peening strengthening unit shot peening strengthening being carried out on the cladding layer surface then handles; Utilize measurement feedback system to detect the surfaceness and the residual stress distribution state thereof of cladding layer; Realize accurate control through central authorities' control and treatment system to coatingsurface roughness and unrelieved stress, thus the excellent high-quality surface cladding coating of obtained performance.This technology is at substrate surface laser melting coating one deck high performance material; And then the cladding layer laser peening handled; If can't eliminate the unrelieved stress that thermograde and thermal stresses produce in the cladding layer in the laser cladding process, suppress the germinating of crackle, then can cause cladding layer cooling back to produce surface crack; Follow-up laser peening treatment effect is seriously influenced, and therefore this technology produce limitation and restriction.
Vibration applications can be traced back to 20th century 50, the sixties in the history of metal founding, and existing at that time vibration possibly change the part microtexture, improve mechanical property, reduce the viewpoint of defective.This viewpoint has obtained confirmation in the research to y alloy y and steel, the broken dentrite arm of vibrational energy meeting in the process of setting makes dentrite be tending towards homogenizing.Through retrieval, find to utilize as yet to add the method that mechanical vibration come crystal grain thinning and inhibition or elimination laser cladding layer crackle, the auxiliary vibration device that be used to cooperate laser melting and coating process, improves the laser cladding layer crackle does not appear in the newspapers yet.
Summary of the invention
The utility model technical problem to be solved is to propose a kind of vibrating device that suppresses the laser cladding layer crackle; For laser cladding process the auxiliary machinery vibration is provided through it; Suppress and elimination laser cladding layer shaping crackle, improve laser cladding layer microstructure and performance.
The technical scheme of the utility model is: suppress the vibrating device of laser cladding layer crackle, be made up of electromagnetic vibration generator system 15 and vibration control system; Electromagnetic vibration generator system comprises body 22, be loaded on electromagnetic oscillation device in the body, be loaded on the electromagnetic oscillation device upper end vibration loading table top 8, be loaded on grip device 7 and vibration control circuit on the vibration loading table top 8, vibration control circuit is the feed circuit (output voltage volume circuit is adjustable) based on signal control; Vibration control system comprises indicating meter 12, signal processing and gear 13, power amplifier 11 and vibration induction probe 9; Indicating meter 12 links to each other with gear 13 with signal processing; Signal processing links to each other with power amplifier 11 with gear 13 output terminals; Power amplifier 11 output terminals link to each other with electromagnetic vibration generator system wave input terminus 14, and vibration induction probe 9 links to each other with the input terminus of signal processing with gear 13, and power amplifier 11 is provided with regulates the adjusting knob 10 that power is exported.
Said electromagnetic oscillation device comprises iron core 20, coil 19 and is positioned at the armature 21 on them, and iron core 20 is fixed on body 22 bases, and armature 21 links to each other with vibration loading table top 8 bottoms.
Said clamp mechanism 7 is with the bolt that vibrates loading table top 8 thread fit or consolidates clamping mechanism on it.
The vibrational frequency of said shaking table is that 50 ~ 400Hz, amplitude are 20 ~ 200 μ m, according to practical object and needs, in given range, selects.The adjustment of vibrational frequency and amplitude can realize through vibration control system.
This rating of set magnifying glass is the common power magnifying glass; Signal processing and gear 13 are common micro-chip (like 8051 micro-chips) or computingmachine; Vibration induction probe 9 is common vibration transducer, and indicating meter 12 is common liquid crystals indicating meter (in order to show and the monitoring vibration parameter).
When this device is used for laser melting and coating process; At first; Treat the cladding matrix and carry out pre-treatment; After cleaning with matrix surface polishing with acetone, use grip device 7 that the body material of treating cladding after the pre-treatment is fixed on the loading table top 8 of shaking table, and shaking table 15 is placed on the numerical control motion stage 16; Then; The work of Vibration on Start-up platform; Indicating meter 12 shows the worktable vibration parameters value that signal processing and gear 13 are set; The signal of signal processing and gear is handled after the wave input terminus 14 of shaking table inputs to the signal control feed circuit driving shaking table vibration of shaking table through magnifying glass 11, and vibration induction probe 9 is gathered vibrational frequency and amplitude signal from vibration loading table top 8, the vibrational frequency and the amplitude of the instant shaking table of feedback after signal processing and gear 13 processing; Thereby reach the purpose of regulating and controlling vibration parameters, whole process is closed-loop control.After electromagnetic vibration generator system 15 gets into working order; The vibration that produces is transmitted through grip device 7 cladding matrix 6 fixed thereon through vibration loading table top 8, re-use side direction synchronous powder feeding system formula carbon dioxide laser cladding equipment, by common laser cladding process of surface treatment; At matrix 6 surface preparation laser cladding layers; Through the exciting force that shaking table 15 mechanical vibration provide to the molten bath, will smash along the nascent dentrite network of matrix bond interface growth, and each position that is distributed to melt forms equally distributed small crystal nucleus; Improve the flowability of surperficial liquid state of molten pool metal, matrix surface form microtexture evenly, crackle and the few laser cladding layer 5 of unrelieved stress.
This device can be used in the laser melting and coating process process, for matrix provides mechanical vibration, crackle in the metal parts of cladding is controlled, and can suppress and eliminate unrelieved stress and crackle, obtains uniform microtexture.Have simple in structurely, easy to use, can effectively improve advantages such as laser cladding layer microtexture and performance, be applicable to the laser cladding forming and the association areas such as reparation and laser melting coating surface strengthening of metal parts.
Description of drawings
Fig. 1 the utility model system schematic;
Fig. 2 the utility model electromagnetic vibration generator system structural representation;
Fig. 3 is the utility model schematic block circuit diagram.
Each label is followed successively by among the figure: 1-synchronous powder feeding system nozzle, 2-powdered alloy, 3-CO
2The laser apparatus laser head, 4-continuous laser, 5-laser cladding layer, 6-cladding matrix; The 7-grip device, 8-vibration table surface, 9-vibration induction probe, 10-power amplifier adjusting knob; The 11-power amplifier, 12-indicating meter, 13-signal processing and gear, 14-wave input terminus; The 15-electromagnetic vibration generator system, 16-numerical control motion stage, 17-synchronous powder feeder, 18-argon protective device.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is done further elaboration, but the protection content of the utility model is not limited to said scope.
Embodiment 1: referring to Fig. 1,2,3, the vibrating device of this inhibition laser cladding layer crackle is made up of electromagnetic vibration generator system 15 and vibration control system; Electromagnetic vibration generator system comprises body 22, be loaded on electromagnetic oscillation device in the body, be loaded on the electromagnetic oscillation device upper end vibration loading table top 8, be loaded on grip device 7 and vibration control circuit on the vibration loading table top 8, vibration control circuit is common variable power output circuit based on Digital Signals; Vibration control system comprises indicating meter 12, signal processing and gear 13, common power magnifying glass 11 and vibration induction probe 9; Indicating meter 12 links to each other with gear 13 with signal processing; Signal processing links to each other with power amplifier 11 with gear 13 output terminals; Power amplifier 11 output terminals link to each other with electromagnetic vibration generator system wave input terminus 14; Vibration induction probe 9 links to each other with the input terminus of signal processing with gear 13, and power amplifier 11 is provided with regulates the adjusting knob 10 that power is exported.Signal processing and gear 13 are common 8051 micro-chips, and indicating meter 12 is the common liquid crystals indicating meter, and vibration induction probe 9 is common vibration transducer.Electromagnetic oscillation device comprises iron core 20, coil 19 and is positioned at the outstanding iron 21 on them that iron core 20 is fixed on body 22 bases, hangs iron 21 and links to each other with vibration loading table top 8 bottoms.Clamp mechanism 7 is and the bolt mechanism of vibrating loading table top 8 thread fit.
Use this device as auxiliary vibration device, be of a size of on the 45 steel board matrixes of 100mm * 40mm * 6mm, carry out the laser melting coating of Ni60CuMoW self-melting alloy.The surface of elder generation's pre-treatment 45 steel matrix 6 with using acetone after its surface finish, is used grip device 7 that pretreated 45 steel matrix 6 are fixed on the vibration loading table top 8 of electromagnetic vibration generator system 15, and electromagnetic vibration generator system 15 is placed on the numerical control motion stage 16.Start electromagnetic vibration generator system 15 then; In adjustment shaking table vibrational frequency is that 150Hz, amplitude are under the 100 μ m conditions; Use side direction synchronous powder feeding system formula carbon dioxide laser cladding equipment,, prepare laser cladding layer at matrix surface by common laser cladding process of surface treatment; By carbon dioxide laser laser head 3 continuous laser 4 is radiated at the surface of cladding matrix 6, and passes through the scanning process of the mobile realization cladding of numerical control operating platform 16; Simultaneously, provide under the situation of high pressure argon shield by synchronous powder feeder 17 at argon protective device 18, powdered alloy 2 be sprayed on the front end of continuous laser 4, thereby form the alloy molten bath at the cladding matrix surface through synchronous powder feeding system nozzle 1; The exciting force that utilizes the shaking table mechanical vibration to provide to the molten bath; To smash along the nascent dentrite network of matrix bond interface growth; And each position that is distributed to melt forms equally distributed small crystal nucleus; Improve the flowability of surperficial liquid state of molten pool metal, matrix surface form microtexture evenly, crackle and the few laser cladding layer 5 of unrelieved stress.
In the whole cladding process, used laser power is that 4kW, sweep velocity are 600mm/min, light spot shape size 6mm * 5mm, adopts the single track powder feeding, and powder feeding rate is 8.5g/min.Used cladding material is Ni60CuMoW self-fluxing alloyed powder (mass percent component: Cr14 ~ 19%, Si3.5 ~ 5.0%, B3.0 ~ 4.5% of 1024 ℃ of fusing points, mean particle size 80 μ m; C0.5 ~ 1.0%, Fe＜8.0%, Cu2 ~ 4%; Mo2 ~ 4%, W2 ~ 3%, surplus Ni).
Embodiment 2: referring to Fig. 1,2,3, the vibrating device of this inhibition laser cladding layer crackle is identical with embodiment 1.The adjustment vibrational frequency is that 400Hz, amplitude are 20 μ m, presses the identical method of embodiment 1, is used for the technological process of laser melting coating, effectively improves laser cladding layer microtexture and performance.
Embodiment 3: referring to Fig. 1,2,3, the vibrating device of this inhibition laser cladding layer crackle is identical with embodiment 1, and grip device 7 adopts clamp structure.The adjustment vibrational frequency is that 50Hz, amplitude are 200 μ m, presses the identical method of embodiment 1, is used for the technological process of laser melting coating, can effectively improve laser cladding layer microtexture and performance.
Embodiment 4: referring to Fig. 1,2,3, the vibrating device of this inhibition laser cladding layer crackle is identical with embodiment 1, and signal processing and gear 13 adopt common computer (computer).The adjustment vibrational frequency is that 250Hz, amplitude are 50 μ m, presses the identical method of embodiment 1, is used for the technological process of laser melting coating, can effectively improve laser cladding layer microtexture and performance.
Claims (5)
1. a vibrating device that suppresses the laser cladding layer crackle is characterized in that: be made up of electromagnetic vibration generator system (15) and vibration control system; Electromagnetic vibration generator system comprises body (22), be loaded on electromagnetic oscillation device in the body, be loaded on the electromagnetic oscillation device upper end vibration loading table top (8), be loaded on grip device (7) and vibration control circuit on the vibration loading table top (8), vibration control circuit is the feed circuit based on signal control; Vibration control system comprises indicating meter (12), signal processing and gear (13), power amplifier (11) and vibration induction probe (9); Indicating meter (12) links to each other with gear (13) with signal processing; Signal processing links to each other with power amplifier (11) with gear (13) output terminal; Power amplifier (11) output terminal links to each other with electromagnetic vibration generator system wave input terminus (14), and vibration induction probe (9) links to each other with the input terminus of signal processing with gear (13).
2. the vibrating device of inhibition laser cladding layer crackle according to claim 1; It is characterized in that: electromagnetic oscillation device comprises iron core (20), coil (19) and is positioned at the armature (21) on them; Iron core (20) is fixed on body (22) base, and armature (21) links to each other with vibration loading table top (8) bottom.
3. the vibrating device of inhibition laser cladding layer crackle according to claim 1 is characterized in that: clamp mechanism (7) is with the bolt that vibrates loading table top (8) thread fit or consolidates clamping mechanism on it.
4. the vibrating device of inhibition laser cladding layer crackle according to claim 1 is characterized in that: the power amplifier of vibration control system (11) is provided with the adjusting knob (10) of regulating power output.
5. the vibrating device of inhibition laser cladding layer crackle according to claim 1 and 2 is characterized in that: the vibrational frequency of shaking table is that 50 ~ 400Hz, amplitude are 20 ~ 200 μ m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204229308U CN202323028U (en) | 2011-10-31 | 2011-10-31 | Vibrating device for inhibiting cracks of laser cladding layer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204229308U CN202323028U (en) | 2011-10-31 | 2011-10-31 | Vibrating device for inhibiting cracks of laser cladding layer |
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| CN202323028U true CN202323028U (en) | 2012-07-11 |
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| CN2011204229308U Expired - Fee Related CN202323028U (en) | 2011-10-31 | 2011-10-31 | Vibrating device for inhibiting cracks of laser cladding layer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110241414A (en) * | 2019-06-25 | 2019-09-17 | 江苏大学 | A kind of laser gain material manufacturing device and method improving component uniformity |
| CN113909503A (en) * | 2021-10-27 | 2022-01-11 | 沈阳工业大学 | Micro-vibration-based auxiliary metal part laser additive manufacturing device and method |
| CN114714623A (en) * | 2020-12-22 | 2022-07-08 | 上海飞机制造有限公司 | Powder removing device |
-
2011
- 2011-10-31 CN CN2011204229308U patent/CN202323028U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110241414A (en) * | 2019-06-25 | 2019-09-17 | 江苏大学 | A kind of laser gain material manufacturing device and method improving component uniformity |
| CN114714623A (en) * | 2020-12-22 | 2022-07-08 | 上海飞机制造有限公司 | Powder removing device |
| CN113909503A (en) * | 2021-10-27 | 2022-01-11 | 沈阳工业大学 | Micro-vibration-based auxiliary metal part laser additive manufacturing device and method |
| CN113909503B (en) * | 2021-10-27 | 2024-01-16 | 沈阳工业大学 | Micro-vibration-based auxiliary metal part laser additive manufacturing device and method |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120711 Termination date: 20141031 |
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