CN105642893A - Laser spot diameter output adjustable device and method for selective laser melting system - Google Patents
Laser spot diameter output adjustable device and method for selective laser melting system Download PDFInfo
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- CN105642893A CN105642893A CN201510662361.7A CN201510662361A CN105642893A CN 105642893 A CN105642893 A CN 105642893A CN 201510662361 A CN201510662361 A CN 201510662361A CN 105642893 A CN105642893 A CN 105642893A
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- galvanometer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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Abstract
The invention provides a laser spot diameter output adjustable device and method for a selective laser melting system. The laser spot diameter output adjustable device for the selective laser melting system comprises a laser input light path (1), a galvanometer scanning system (2), a lifting mechanism (3) and a field lens (4). The laser spot diameter output adjustable device and method for the selective laser melting system have the beneficial effects that the diameter of a laser spot output by a laser device can be adjusted only through simple operation, so that operation is convenient and rapid, an SLM forming system can be suitable for machining powder materials with multiple properties, and the working efficiency is improved.
Description
Technical field
The invention belongs to metal powder laser fusing and increase material manufacturing technology field, be specifically related to a kind of precinct laser fusion system laser spot diameter and export tunable arrangement and method.
Background technology
Rapid Manufacturing Technology is based on increasing material superposition manufacturing theory, the technology such as logging material, machinery, control, computer is in one, can effectively overcome the technology limitation that complex construction is difficult to manufacture, a manufacture difficult problem for the high-end complex parts of the chain drive such as aerospace, automobile can be solved. Such as manufacturing concern application Rapid Manufacturing Technology aid casting wax-pattern, the sand mold of U.S., moral, Deng state, greatly improve the state of the art of conventional cast technique. At present, in the Duo Jia precision casting producer of full Europe 400, Rapid Manufacturing Technology is employed more than 90%. This technology has been considered as promoting one of critical support technology of core realm level such as aerospace, automobile and weaponry by American-European government.
Display is added up in internal authority report " Wo Lesi report 2010 " (" WohlersReport2010 "), manufactures as an independent production technology fast, has the market of 1.3 trillion dollars, and China's total sales volume only accounts for 4.8%. Generally, China is in this field and researches and develops situation leading, lag application, and its value not yet causes enough attention.
At present, the 3D printing technique that really can directly manufacture metal parts has the laser-engineering net shaping (LaserEngineeringNetShaping based on coaxial powder-feeding, LENS) technology and the precinct laser fusion (SelectiveLaserMelting based on powder bed, and electron-beam melting technology (ElectronBeamMelting, EBM) technology SLM). LENS technology can directly produce large-sized metal parts blank; SLM and EBM can manufacture complicated fine metal part.
SLM technology utilizes the thin layer powder that high energy beam laser fusion is layered on powder bed in advance, melts stack shaping by layer. In order to ensure the quick fusing of metal powder material, SLM material adopts the laser apparatus of higher power density, and focal beam spot is very trickle. The metal parts that SLM manufactures is close to complete fine and close, and intensity reaches forging level, and precision can reach 0.1mm/100mm.
But, in the process realizing the present invention, contriver finds, existing SLM technology mainly exists following problem:
Need to adopt complicated mechanism, laser apparatus just can be made to export the laser facula of different diameter, there is the deficiency that laser spot diameter adjustment is complicated, thus reduce the working efficiency that precinct laser fusion is shaped.
Summary of the invention
For the defect that prior art exists, the present invention provides a kind of precinct laser fusion system laser spot diameter to export tunable arrangement and method, can effectively solve the problem.
The technical solution used in the present invention is as follows:
The present invention provides a kind of precinct laser fusion system laser spot diameter to export tunable arrangement, comprises laser input light path (1), galvanometer scanning system (2), hoisting appliance (3) and field lens (4);
Wherein, described galvanometer scanning system (2) comprises galvanometer casing (21) and is installed on the inner galvanometer of described galvanometer casing (21), described galvanometer casing (21) can be installed on described hoisting appliance (3) in lifting, and then adjustable described vibrating mirror distance is from the distance between scanning work plane;
Described laser input light path (1) is through described galvanometer casing (21), and forms light-path with described galvanometer; Described field lens (4) is fixedly installed on described galvanometer casing (21), and, described field lens (4) is arranged in the reflection light path of described galvanometer.
Preferably, described laser input light path (1) and described field lens (4) are all horizontally disposed with.
The present invention also provides a kind of precinct laser fusion system laser spot diameter to export adjustable method, comprises the following steps:
Step 1, arranges galvanometer casing (21) above scanning work plane, and described galvanometer casing (21) can lifting be installed on hoisting appliance (3); Galvanometer is installed in the inside of described galvanometer casing (21), field lens (4) is installed in the lower section of galvanometer, and, field lens (4) is fixed on galvanometer casing (21);
Step 2, when needing the diameter regulating laser facula, regulates the position of galvanometer casing (21), and then regulates the vertical range between galvanometer casing (21) to scanning work plane along hoisting appliance (3) at vertical direction; When vertical range when between galvanometer casing (21) to scanning work plane changes, cause the vertical range between field lens (4) and galvanometer to scanning work plane that synchronous change occurs, therefore, finally regulate the vertical range between field lens (4) to scanning work plane;
Step 3, when the vertical range when between field lens (4) to scanning work plane changes, namely have adjusted the diameter of laser facula.
Preferably, step 3 is specially:
When vertical range when between field lens (4) to scanning work plane equals field lens (4) focal length, the laser spot diameter now formed is minimum;
When vertical range when between field lens (4) to scanning work plane is greater than field lens (4) focal length, the vertical range between field lens (4) to scanning work plane is more big, and the laser spot diameter of formation is more big;
When vertical range when between field lens (4) to scanning work plane is less than field lens (4) focal length, the vertical range between field lens (4) to scanning work plane is more little, and the laser spot diameter of formation is more big.
Precinct laser fusion system laser spot diameter provided by the invention exports tunable arrangement and method has the following advantages:
This device only needs simple operations, and namely the diameter of adjustable laser apparatus Output of laser hot spot, convenient and swift, thus make SLM shaping system can adapt to the processing of multiple performance powdered material, it is to increase working efficiency.
Accompanying drawing explanation
Fig. 1 is the structural representation that precinct laser fusion system laser spot diameter provided by the invention exports tunable arrangement;
Fig. 2 is the principle schematic of laser spot diameter influence factor provided by the invention;
Fig. 3 is that laser spot diameter is to the effect diagram of scanning area;
Fig. 4 is that laser facula and power become the schematic diagram causing greatly the energy transmission degree of depth to become big simultaneously.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail:
The present invention provides a kind of precinct laser fusion system laser spot diameter to export tunable arrangement, this device can simple operations, the i.e. diameter of adjustable Output of laser hot spot, convenient and swift, thus adapt to the processing of multiple performance powdered material for SLM shaping system, increase work efficiency, it is provided that a kind of novel method.
Concrete, as shown in Figure 1, precinct laser fusion system laser spot diameter exports tunable arrangement and comprises laser input light path 1, galvanometer scanning system 2, hoisting appliance 3 and field lens 4;
Wherein, galvanometer scanning system 2 comprises galvanometer casing 21 and is installed on the galvanometer of galvanometer casing 21 inside, and galvanometer casing 21 can be installed on hoisting appliance 3 in lifting, and then adjustable vibrating mirror distance is from the distance between scanning work plane;
Laser input light path 1 is through galvanometer casing 21, and forms light-path with galvanometer; Field lens 4 is fixedly installed on galvanometer casing 21, and, field lens 4 is arranged in the reflection light path of galvanometer. Laser input light path 1 and field lens 4 are all horizontally disposed with.
The functional relationship of said structure parts is as follows:
(1) laser input light is by media such as optical fiber, is transported to galvanometer by laser input light path, as shown in the arrow a of Fig. 1;
(2), after galvanometer receives laser beam, by swinging eyeglass, sharp light redirection is outputted to field lens, as shown in the arrow b of Fig. 1;
(3) lifting structure and galvanometer are assembled together, it is possible to galvanometer is moved at vertical direction, and then regulate the vertical range between galvanometer to scanning work plane; Again owing to field lens and galvanometer are fixed, therefore, the distance between field lens and galvanometer immobilizes, so, when the vertical range when between galvanometer to scanning work plane changes, namely have adjusted the vertical range between field lens to scanning work plane.
When vertical range when between field lens and scanning work plane equals field lens focal length, with reference to figure 2, when namely scanning work plane is the f1 plane in Fig. 2, now laser facula is minimum, and energy density is the highest. Otherwise, the distance of field lens and scanning work plane is in out of focus state (deviation focal plane), laser spot diameter now becomes big, with reference to figure 2, when scanning work plane is the f2 plane in Fig. 2 or during f3 plane, laser spot diameter becomes big, therefore, by regulating the vertical range between field lens and scanning work plane, namely have adjusted laser spot diameter.
The present invention also provides a kind of precinct laser fusion system laser spot diameter to export adjustable method, comprises the following steps:
Step 1, arranges galvanometer casing 21 above scanning work plane, and galvanometer casing 21 can lifting be installed on hoisting appliance 3; Galvanometer is installed in the inside of galvanometer casing 21, field lens 4 is installed in the lower section of galvanometer, and, field lens 4 is fixed on galvanometer casing 21;
Step 2, when needing the diameter regulating laser facula, regulates the position of galvanometer casing 21, and then regulates the vertical range between galvanometer casing 21 to scanning work plane along hoisting appliance 3 at vertical direction; When vertical range when between galvanometer casing 21 to scanning work plane changes, cause the vertical range between field lens 4 and galvanometer to scanning work plane that synchronous change occurs, therefore, the vertical range between final adjustment field lens 4 to scanning work plane;
Step 3, when the vertical range when between field lens 4 to scanning work plane changes, namely have adjusted the diameter of laser facula.
This step is specially:
When vertical range when between field lens 4 to scanning work plane equals field lens 4 focal length, the laser spot diameter now formed is minimum;
When vertical range when between field lens 4 to scanning work plane is greater than field lens 4 focal length, the vertical range between field lens 4 to scanning work plane is more big, and the laser spot diameter of formation is more big;
When vertical range when between field lens 4 to scanning work plane is less than field lens 4 focal length, the vertical range between field lens 4 to scanning work plane is more little, and the laser spot diameter of formation is more big.
Export tunable arrangement by precinct laser fusion system laser spot diameter provided by the invention, can conveniently regulate laser spot diameter. The convenient and swift adjustment of laser spot diameter, can be the shaping of metal-powder and brings plurality of advantages. First, it is possible to regulate laser facula size according to the mobility of the fusing point of shaping powder, liquid metal etc. so that it is more adapting to thermal characteristics, the granularity of powdered material, forming quality is better; Secondly, owing to spot diameter becomes big, the covering face of single-spot energy also becomes big thereupon, therefore, the sweep span of laser beam just needs suitably to tune up, it is possible to improve forming efficiency, as shown in Figure 3, for laser spot diameter is to the effect diagram of scanning area, on the left of the arrow of Fig. 3 and right side, it is similarly 7 sweep traces, owing to the laser spot diameter on the right side of arrow is greater than the laser spot diameter on the left of arrow, therefore, scanning area on the right side of arrow is greater than the scanning area on the left of arrow; Have again, coordinate the raising of laser beam power input, increase spot diameter, it is possible to improve laser energy penetration depth, thus increase powder accumulation thickness, reduce the manufacture number of plies of same height part, reach the object improving forming efficiency equally; As shown in Figure 4, for laser facula and power become the schematic diagram causing greatly the energy transmission degree of depth to become big simultaneously, in the diagram, h2 is greater than h1, and h1 represents: when laser beam power input and spot diameter are all less, the laser energy penetration depth of formation; And h2 represents: when laser beam power input and spot diameter are all bigger, the laser energy penetration depth of formation.
It thus is seen that precinct laser fusion system laser spot diameter provided by the invention exports tunable arrangement and method has the following advantages:
This device only needs simple operations, and namely the diameter of adjustable laser apparatus Output of laser hot spot, convenient and swift, thus make SLM shaping system can adapt to the processing of multiple performance powdered material, it is to increase working efficiency.
The above is only the preferred embodiment of the present invention; it is noted that for those skilled in the art, under the premise without departing from the principles of the invention; can also making some improvements and modifications, these improvements and modifications also should look protection scope of the present invention.
Claims (4)
1. a precinct laser fusion system laser spot diameter exports tunable arrangement, it is characterised in that, comprise laser input light path (1), galvanometer scanning system (2), hoisting appliance (3) and field lens (4);
Wherein, described galvanometer scanning system (2) comprises galvanometer casing (21) and is installed on the inner galvanometer of described galvanometer casing (21), described galvanometer casing (21) can be installed on described hoisting appliance (3) in lifting, and then adjustable described vibrating mirror distance is from the distance between scanning work plane;
Described laser input light path (1) is through described galvanometer casing (21), and forms light-path with described galvanometer; Described field lens (4) is fixedly installed on described galvanometer casing (21), and, described field lens (4) is arranged in the reflection light path of described galvanometer.
2. precinct laser fusion system laser spot diameter according to claim 1 exports tunable arrangement, it is characterised in that, described laser input light path (1) and described field lens (4) are all horizontally disposed with.
3. a precinct laser fusion system laser spot diameter exports adjustable method, it is characterised in that, comprise the following steps:
Step 1, arranges galvanometer casing (21) above scanning work plane, and described galvanometer casing (21) can lifting be installed on hoisting appliance (3); Galvanometer is installed in the inside of described galvanometer casing (21), field lens (4) is installed in the lower section of galvanometer, and, field lens (4) is fixed on galvanometer casing (21);
Step 2, when needing the diameter regulating laser facula, regulates the position of galvanometer casing (21), and then regulates the vertical range between galvanometer casing (21) to scanning work plane along hoisting appliance (3) at vertical direction; When vertical range when between galvanometer casing (21) to scanning work plane changes, cause the vertical range between field lens (4) and galvanometer to scanning work plane that synchronous change occurs, therefore, finally regulate the vertical range between field lens (4) to scanning work plane;
Step 3, when the vertical range when between field lens (4) to scanning work plane changes, namely have adjusted the diameter of laser facula.
4. precinct laser fusion system laser spot diameter according to claim 3 exports adjustable method, it is characterised in that, step 3 is specially:
When vertical range when between field lens (4) to scanning work plane equals field lens (4) focal length, the laser spot diameter now formed is minimum;
When vertical range when between field lens (4) to scanning work plane is greater than field lens (4) focal length, the vertical range between field lens (4) to scanning work plane is more big, and the laser spot diameter of formation is more big;
When vertical range when between field lens (4) to scanning work plane is less than field lens (4) focal length, the vertical range between field lens (4) to scanning work plane is more little, and the laser spot diameter of formation is more big.
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| CN107498049A (en) * | 2017-09-05 | 2017-12-22 | 洛阳华理研究院科技有限公司 | A kind of light path device of self-action adjustable focus plane for 3D printing |
| CN110039053A (en) * | 2019-05-14 | 2019-07-23 | 哈尔滨福沃德多维智能装备有限公司 | A kind of laser fusing 3D printing equipment laser focal plane determines system and method |
| CN110785247A (en) * | 2017-06-19 | 2020-02-11 | Addup公司 | Focus calibration of a power radiation source of an additive manufacturing device |
| EP3995233A4 (en) * | 2019-07-02 | 2023-08-02 | Ebara Corporation | Am device |
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Denomination of invention: Adjustable device and method for laser spot diameter output of selective laser melting system Granted publication date: 20190122 Pledgee: Industrial Bank Co.,Ltd. Daqing branch Pledgor: Heilongjiang Duowei spacetime free Manufacturing Co.,Ltd. Registration number: Y2024230000006 |
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