CN104226996B - A kind of laser 3D prints the device and method of impeller of pump - Google Patents
A kind of laser 3D prints the device and method of impeller of pump Download PDFInfo
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- CN104226996B CN104226996B CN201410435407.7A CN201410435407A CN104226996B CN 104226996 B CN104226996 B CN 104226996B CN 201410435407 A CN201410435407 A CN 201410435407A CN 104226996 B CN104226996 B CN 104226996B
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000000843 powder Substances 0.000 claims abstract description 200
- 238000005245 sintering Methods 0.000 claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 21
- 238000010146 3D printing Methods 0.000 claims abstract description 9
- 238000011084 recovery Methods 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims abstract description 4
- 238000000465 moulding Methods 0.000 claims description 29
- 239000001301 oxygen Substances 0.000 claims description 16
- 229910052760 oxygen Inorganic materials 0.000 claims description 16
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 15
- 239000007789 gas Substances 0.000 claims description 14
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 9
- 238000007639 printing Methods 0.000 claims description 9
- 238000005086 pumping Methods 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 229910052786 argon Inorganic materials 0.000 claims description 5
- 229910052769 Ytterbium Inorganic materials 0.000 claims description 4
- 239000000835 fiber Substances 0.000 claims description 4
- 239000013307 optical fiber Substances 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000005192 partition Methods 0.000 abstract description 2
- 239000011261 inert gas Substances 0.000 abstract 1
- 229910052751 metal Inorganic materials 0.000 description 9
- 239000002184 metal Substances 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 6
- 238000000110 selective laser sintering Methods 0.000 description 3
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000010410 dusting Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
- 238000007648 laser printing Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000013316 zoning Methods 0.000 description 1
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Abstract
The invention discloses a kind of laser 3D and print the device and method of impeller of pump, belong to 3D printing technique field.Described device includes laser system, atmosphere protection system, pre-heating system, powder feed system, spreads powder system, powder recovery system and computer system.Described manufacture method mainly comprises the steps: the CAD physical model of 1. drafting impeller of pump, and carries out hierarchy slicing along Z-direction；2. by every layer of performance requirement partition cut into slices according to impeller of pump: Ith district, IIth district；3. Ith district of pair each slicing layer uses powder A to carry out low speed sintering, and IIth district uses powder material B sintering at a high speed.In print procedure, surface of the work and powder flow field are carried out inert gas shielding.The present invention had both met the different requirements to mechanical performance of the impeller of pump diverse location, can improve again print quality and speed, reduced manufacturing cost.
Description
Technical field
The present invention relates to a kind of method that laser 3D prints metal parts, a kind of method particularly relating to 3D laser printing impeller of pump.
Background technology
3D printing technique, it is to design a model as source with Computerized three-dimensional, discrete and the numerical control molding system by software hierarchy, utilize the mode such as laser beam, hot melt nozzle successively to be piled up by the special materials such as metal dust, ceramic powders, plastics, cell tissue to cohere, final superposition molding, produces entity products.
SLS (selective laser sintering) utilizes dusty material principle of sintering under laser irradiates, computer key-course layer stack form type.SLS technology is to use stacking to pile up molding equally, except that, first it spread one layer of dusty material, by material preheater to close to melting point, re-using laser to scan on this layer cross section, make powder temperature rise to melting point, then sintering is formed bonding, the most constantly repeat to spread powder, the process of sintering, until completing whole model forming.
3D prints and is typically with what digital technology file printing machine realized.Past its be often used for modeling in the field such as Making mold, industrial design, be now increasingly used for the direct manufacture of some products, had the parts using this technology to print.This technology is at jewelry, footwear, industrial design, building, engineering and construction (AEC), automobile, and Aero-Space, dentistry and medical industries, education, GIS-Geographic Information System, civil engineering, gun and other field have been applied.
Currently used 3D prints same metal parts, and the parameter such as its laser power, scanning speed, dusting speed is all fixing, thus the mechanical performance of the part various piece after molding is almost identical.It is true that for overwhelming majority metal parts, the mechanical performance wanted required for the different parts of part differs.Traditional 3D printing model is unfavorable for the reasonable disposition of resource, and the ratio of briquetting of metal parts is low.Chinese patent application CN201310173202.1 discloses a kind of method that differentiation laser 3D prints metalwork, slicing layer is divided into three, interior China and foreign countries part, can solve the problems referred to above in any case.But this partition method is the most loaded down with trivial details, a lot of metal parts, such as impeller of pump, not only high request is proposed the mechanical performance on surface, it is to also require that there is high mechanical performance to some particular portion, in addition, there is presently no and the device that can realize above-mentioned manufacture method is provided out.
Summary of the invention
It is an object of the invention to can not solve, for current 3D printing technique, the problem that mechanical performance difference is required by the different parts of impeller of pump well, it is provided that a kind of be easily achieved and respond well laser 3D printing equipment and method are to print impeller of pump.
For solving above-mentioned technical problem, the technical scheme is that a kind of laser 3D prints the device of impeller of pump, including laser head, powder feeder, powder shower nozzle, three freedom degree manipulator, work top, vacuum pump and closing chamber, described laser head is arranged on described powder shower nozzle, described powder feeder is connected with the powder hole that enters on described powder shower nozzle, described powder shower nozzle is controlled by described three freedom degree manipulator, it is possible to completes top to bottom, left and right, front and rear and moves；Described work top is provided with powder-laying roller cylinder, is sequentially provided with the first collection powder cylinder, the first powder feeding cylinder, moulding cylinder, the second powder feeding cylinder and second and collects powder cylinder below described work top；Described laser head, described powder shower nozzle, described three freedom degree manipulator, described work top, described first collection powder cylinder, described first powder feeding cylinder, described moulding cylinder, described second powder feeding cylinder and described second are collected powder cylinder and are respectively positioned on described closing intracavity, air inlet and gas outlet is had on described closing chamber, described closing intracavity is also equipped with oxygen concentration sensor, and described vacuum pump is used for described closing chamber evacuation.
In such scheme, described closing intracavity is also equipped with powder density sensor.
In such scheme, the lower end of described moulding cylinder is also equipped with the 3rd collection powder cylinder, is provided with shaking device between described 3rd collection powder cylinder.
In such scheme, described laser head being also connected with focusing collimator in turn, double clad mixes ytterbium ion optical fiber, fiber grating, bonder and multimode laser diode pumping source.
In such scheme, the piston end surface of described moulding cylinder is also equipped with resistance wire unit, is used for preheating to parts to be printed.
In such scheme, connect at described gas outlet and have gas purifier.
In such scheme, described powder feeder, described three freedom degree manipulator, described vacuum pump, described powder-laying roller cylinder, described first collection powder cylinder, described first powder feeding cylinder, described moulding cylinder, described second powder feeding cylinder and described second collect powder cylinder, described powder density sensor, described resistance wire unit, described multimode laser diode pumping source by computer control.
Present invention also offers a kind of method that laser 3D prints impeller of pump, including: A. draws the CAD physical model of impeller of pump, and carries out hierarchy slicing along Z-direction, and slice thickness is 0.3mm；B. section is scanned, divides every layer of section into I district and II district according to the performance requirement of impeller of pump；Wherein, what in every layer of section, performance requirement was high is labeled as I district, and what performance requirement was low is labeled as II district；C. choosing two kinds of different 3D printing consumables, powder A and powder material B, powder A is Co-based alloy powder, and powder material B is iron(-)base powder, and materials A loads in powder feeder, and powder material B is respectively put in the first powder feeding cylinder and described second powder feeding cylinder；D. vacuum pump is opened, close vacuum pump when oxygen concentration sensor records closing intracavity oxygen concentration less than 0.1pa, fill logical argon by air inlet toward closing chamber, when oxygen concentration is less than 40ppm during oxygen concentration sensor detects closing chamber, resistance wire cell operation, pre-heating system is opened；E. powder feeder starts powder feeding, laser beam is controlled the I district of the first slicing layer is carried out low speed sintering by computer, first slicing layer I district has sintered rear powder feeder and has stopped powder feeding, second powder feeding cylinder rises 0.8mm, it is positioned at the powder-laying roller cylinder on the left of the second powder feeding cylinder to move right and start to spread powder, laser beam starts to carry out II district sintering at a high speed, and when pawnshop powder roller moves right on the right side of the first powder feeding cylinder, ground floor prints and terminates；Then powder feeder powder feeding again, laser beam carries out low speed sintering to the I district of the second slicing layer, second slicing layer I district has sintered rear powder feeder and has stopped powder feeding, first powder feeding cylinder rises 0.8mm, second powder feeding cylinder remains stationary as, powder-laying roller cylinder is moved to the left and starts to spread powder, and laser beam continues to carry out the II district of the second slicing layer sintering at a high speed, completes the printing of the second layer；F. judging whether part has printed, if being not fully complete, then moulding cylinder declines 0.3mm, and repeats step E；If having printed, then opening bottom moulding cylinder, shaking device is opened, and Powder Recovery to the 3rd is collected in powder cylinder；When powder concn sensor detects closing intracavity powder concn less than safety value, take out part.
In step E of said method, when laser beam is controlled to carry out the I district of the first slicing layer low speed sintering by computer, described laser power is 2500W, and scanning speed is 8mm/s, powder feed rate 10g/min, and sweep length is 2mm.
In step E of said method, when laser beam starts to carry out II district sintering at a high speed, laser power is 2000W, and scanning speed is 4mm/s, and powder feed rate is 20g/min, and sweep length is 3mm.
Compared to present 3D Method of printing, the advantage of the method for the present invention is: (1) is according to the technology requirement of impeller of pump, section to impeller of pump carries out science subregion, using different materials, different powder feed rates to be sintered different subregions, laser frequency and the speed of employing are the most different.Having reasonable mechanical performance after materials A sintering, the mechanical performance after material B sintering is general.The impeller of pump that be can print out by this device and method can meet its mechanical property requirements, has outstanding surface property.(2) whole device is by computer system centralized Control, simple to operate, it is easy to accomplish.This device and method can improve print speed simultaneously, saves resource, reduces and prints cost.
Accompanying drawing explanation
Fig. 1 is the structural representation of apparatus of the present invention.
Fig. 2 is the zoning plan of impeller of pump of the present invention.
nullIn the drawings: 1-argon gas source，2-powder input port，3-powder feeder，4-powder A，5-focusing collimator，6-double clad mixes ytterbium ion optical fiber，7-fiber grating，8-bonder，9-multimode laser diode pumping source，10-three freedom degree manipulator，11-powder density sensor，12-moulding cylinder，13-powder material B,14-the first powder feeding cylinder，15-first collects powder cylinder，16-the 3rd collects powder cylinder，17-metal parts，18-protector plate for glass，19-laser head，20-enters powder hole，21-laser beam，22-resistance wire unit，23-piston，24-the second powder feeding cylinder，25-powder-laying roller cylinder，26-second collects powder cylinder，27-vacuum pump，28-gas purifier，29-oxygen concentration sensor，30-computer，31-air inlet，32-gas outlet，33-powder shower nozzle，34、Work top，35、Close chamber.
Detailed description of the invention
Below in conjunction with instantiation, the present invention is more specifically described in detail.
A kind of laser 3D prints the device of impeller of pump, as shown in Figure 1, including laser head 19, powder feeder 3, powder shower nozzle 33, three freedom degree manipulator 10, work top 34, vacuum pump 27 and closing chamber 35, described laser head 19 is arranged on described powder shower nozzle 33, focusing collimator 5 it is connected with in turn on laser head 19, double clad mixes ytterbium ion optical fiber 6, fiber grating 7, bonder 8 and multimode laser diode pumping source 9.Described powder feeder 3 is connected with the powder hole 20 that enters on described powder shower nozzle, having powder input port 2 on described powder feeder 3, powder feeder 3 is connected with argon gas source 1, is used for providing power for powder feeder 3, described powder shower nozzle 33 is controlled by described three freedom degree manipulator 10, it is possible to completes top to bottom, left and right, front and rear and moves；Described work top 34 is provided with powder-laying roller cylinder 25, is sequentially provided with first collection powder cylinder the 15, first powder feeding cylinder 14, moulding cylinder the 12, second powder feeding cylinder 24 and the second collection powder cylinder 26 below described work top 34；Being also equipped with resistance wire unit 22 on piston 23 end face of moulding cylinder, be used for preheating to parts to be printed, the lower end of moulding cylinder 12 is also equipped with the 3rd collection powder cylinder 16,
It is provided with shaking device between described 3rd collection powder cylinder 16, the vibrations of remaining powder can be recovered in the 3rd collection powder cylinder 16 after having printed；Described laser head 19, described powder shower nozzle 33, described three freedom degree manipulator 10, described work top 34, described vacuum pump 27, described first collection powder cylinder 15, described first powder feeding cylinder 14, described moulding cylinder 12, described second powder feeding cylinder 24 and described second are collected powder cylinder 26 and are respectively positioned in described closing chamber 35；Described powder feeder 3, described resistance wire unit 22, described shaking device, described three freedom degree manipulator 10, described vacuum pump 27, described powder-laying roller cylinder 25, described first collection powder cylinder 15, described first powder feeding cylinder 14, described moulding cylinder 12, described second powder feeding cylinder 24 and described second collection powder cylinder 26, described powder density sensor 11, described resistance wire unit 22, described multimode laser diode pumping source (9) are controlled by computer 30.Air inlet 31 and gas outlet 32 is had on described closing chamber 35, connect at gas outlet 32 and have gas purifier 28, purify in advance before being used for discharging the gas closed in chamber 35, in described closing chamber 35, be also equipped with oxygen concentration sensor 29 and powder density sensor 11.
Above-mentioned laser 3D prints the method that impeller of pump device carries out printing, including: A. draws the CAD physical model of impeller of pump, and carries out slicing delamination along Z-direction, and slice thickness is 0.3mm；B. section is scanned, divides every layer of section into I district and II district according to the performance requirement of impeller of pump；Wherein, what in every layer of section, performance requirement was high is labeled as I district, and what performance requirement was low is labeled as II district；C. choosing two kinds of different 3D printing consumables, powder A 4 and powder material B 13, powder A 4 is Co-based alloy powder, and powder material B 13 is iron(-)base powder, and powder A 4 loads in powder feeder 3, and powder material B 13 is respectively put in the first powder feeding cylinder 14 and described second powder feeding cylinder 24；D. vacuum pump 27 is opened, vacuum pump 27 is closed when oxygen concentration sensor 29 records closing intracavity oxygen concentration less than 0.1pa, logical argon is filled toward closing chamber 35 by air inlet 31, when during oxygen concentration sensor detects closing chamber, oxygen concentration is less than 40ppm, resistance wire unit 22 is energized, and pre-heating system is opened；E. powder feeder 3 starts powder feeding, laser beam 21 is controlled the I district of the first slicing layer is carried out low speed sintering by computer 30, first slicing layer I district has sintered rear powder feeder 3 and has stopped powder feeding, second powder feeding cylinder 24 rises 0.8mm, it is positioned at the powder-laying roller cylinder 25 on the left of the second powder feeding cylinder 24 to move right and start to spread powder, laser beam 21 starts to carry out II district sintering at a high speed, and when pawnshop powder roller 25 moves right on the right side of the first powder feeding cylinder 14, ground floor prints and terminates；Then powder feeder 3 powder feeding again, laser beam 21 carries out low speed sintering to the I district of the second slicing layer, second slicing layer I district has sintered rear powder feeder 3 and has stopped powder feeding, first powder feeding cylinder 14 rises 0.8mm, second powder feeding cylinder 24 remains stationary as, powder-laying roller cylinder 25 is moved to the left and starts to spread powder, and laser beam 21 continues to carry out the II district of the second slicing layer sintering at a high speed, completes the printing of the second layer.Laser power is 2000W, and scanning speed is 4mm/s, and powder feed rate is 20g/min, and sweep length is 3mm.F. judging whether part has printed, if being not fully complete, then moulding cylinder 12 declines 0.3mm, and repeats step E；Being provided with shaking device bottom moulding cylinder 12, after whole printing terminates, open bottom moulding cylinder 12, shaking device activates, and Powder Recovery to the 3rd is collected in powder cylinder 16；When powder concn sensor 11 detects closing intracavity powder concn less than safety value, take out part.
Generally, impeller is higher for blade and the performance requirement of inner surface being connected with axle, thus two, the surface part that I district is mainly contacted with axle when installing by impeller blade and impeller is constituted, the surface that wherein impeller contacts with axle when installing extends to the region towards radial depth 4mm, remaining region is II district, and its radial depth is about 80mm.Resistance wire unit 22 is mainly made up of resistance wire and temperature control equipment, can design some temperature sensors so that automatically controlling in closing chamber 35.Being provided with shaking device bottom moulding cylinder 12, after whole printing terminates, open bottom moulding cylinder 12, shaking device activates, it is simple to reclaim powder.
Impeller of pump is a kind of metal parts more special to mechanical property requirements, use apparatus of the present invention and method to manufacture impeller, be possible not only to meet its performance requirement, especially surface property, and the speed of printing can be improved, the recovery for material is the most more satisfactory.The inventive method is also adapted to the 3D of the special metal parts of some other structural requirement and prints.
Claims (9)
1. the device of a laser 3D printing impeller of pump
It is characterized in that, including laser head (19), powder feeder (3), powder shower nozzle (33), three freedom degree manipulator (10), work top (34), vacuum pump (27) and closing chamber (35), described laser head (19) is arranged on described powder shower nozzle (33), described powder feeder (3) is connected with the powder hole (20) that enters on described powder shower nozzle, described powder shower nozzle (33) is controlled by described three freedom degree manipulator (10), it is possible to completes top to bottom, left and right, front and rear and moves；Described work top (34) is provided with powder-laying roller cylinder (25), and described work top (34) lower section is sequentially provided with the first collection powder cylinder (15), the first powder feeding cylinder (14), moulding cylinder (12), the second powder feeding cylinder (24) and second and collects powder cylinder (26)；Described laser head (19), described powder shower nozzle (33), described three freedom degree manipulator (10), described work top (34), described first collection powder cylinder (15), described first powder feeding cylinder (14), described moulding cylinder (12), described second powder feeding cylinder (24) and described second are collected powder cylinder (26) and are respectively positioned in described closing chamber (35), have air inlet (31) and gas outlet (32) on described closing chamber (35), in described closing chamber (35), be also equipped with oxygen concentration sensor (29)
, described vacuum pump (27) is used for described closing chamber (35) evacuation；The lower end of described moulding cylinder (12) is also equipped with the 3rd collection powder cylinder (16)
, the described 3rd collects powder cylinder (16) is provided with shaking device.
A kind of laser 3D the most according to claim 1 prints the device of impeller of pump
, it is characterised in that it is also equipped with powder density sensor (11) in described closing chamber (35).
A kind of laser 3D the most according to claim 1 prints the device of impeller of pump
It is characterized in that, described laser head (19) is also connected with in turn focusing collimator (5), and double clad mixes ytterbium ion optical fiber (6), fiber grating (7), bonder (8) and multimode laser diode pumping source (9).
A kind of laser 3D the most according to claim 3 prints the device of impeller of pump
, it is characterised in that it is also equipped with resistance wire unit (22) on piston (23) end face of described moulding cylinder, is used for preheating to parts to be printed.
A kind of laser 3D the most according to claim 4 prints the device of impeller of pump
, it is characterised in that described gas outlet (32) place connects gas purifier (28).
A kind of laser 3D the most according to claim 5 prints the device of impeller of pump
It is characterized in that, described powder feeder (3), described three freedom degree manipulator (10), described vacuum pump (27), described powder-laying roller cylinder (25), described first collection powder cylinder (15), described first powder feeding cylinder (14), described moulding cylinder (12), described second powder feeding cylinder (24) and described second collection powder cylinder (26), described powder density sensor (11), described resistance wire unit (22), described multimode laser diode pumping source (9) are all connected with computer (30).
7. the method that laser 3D prints impeller of pump, including:
A. drawing the CAD physical model of impeller of pump, and carry out hierarchy slicing along Z-direction, slice thickness is 0.3mm；
B. section is scanned, divides every layer of section into I district and II district according to the performance requirement of impeller of pump；Wherein, what in every layer of section, performance requirement was high is labeled as I district, and what performance requirement was low is labeled as II district；
C. two kinds of different 3D printing consumables are chosen, powder A (4) and powder material B (13), powder A (4) is Co-based alloy powder, powder material B (13) is iron(-)base powder, materials A (4) loads in powder feeder (3), and powder material B (13) is respectively put in the first powder feeding cylinder (14) and the second powder feeding cylinder (24)；
D. vacuum pump (27) is opened, vacuum pump (27) is closed when oxygen concentration sensor (29) records closing intracavity oxygen concentration less than 0.1pa, logical argon is filled toward closing chamber (35) by air inlet (31), when during oxygen concentration sensor detects closing chamber, oxygen concentration is less than 40ppm, resistance wire unit (22) is energized, and pre-heating system is opened；
E. powder feeder (3) starts powder feeding, laser beam (21) is controlled the I district of the first slicing layer is carried out low speed sintering by computer (30), first slicing layer I district has sintered rear powder feeder (3) and has stopped powder feeding, second powder feeding cylinder (24) rises 0.8mm, the powder-laying roller cylinder (25) being positioned at the second powder feeding cylinder (24) left side moves right and starts to spread powder, laser beam (21) starts to carry out II district sintering at a high speed, when pawnshop powder roller (25) moves right to the first powder feeding cylinder (14) right side, ground floor prints and terminates；Then powder feeder (3) powder feeding again, laser beam (21) carries out low speed sintering to the I district of the second slicing layer, second slicing layer I district has sintered rear powder feeder (3) and has stopped powder feeding, first powder feeding cylinder (14) rises 0.8mm, second powder feeding cylinder (24) remains stationary as, powder-laying roller cylinder (25) is moved to the left and starts to spread powder, laser beam (21) continues to carry out the II district of the second slicing layer sintering at a high speed, completes the printing of the second layer；
F. judging whether part has printed, if being not fully complete, then moulding cylinder (12) declines 0.3mm, and repeats step E；If having printed, then moulding cylinder (12) bottom is opened, and shaking device is opened, and Powder Recovery to the 3rd is collected in powder cylinder (16)；When powder concn sensor (11) detects closing intracavity powder concn less than safety value, take out part.
A kind of laser 3D the most according to claim 7 prints the method for impeller of pump, it is characterized in that, when in step E, laser beam (21) is controlled to carry out the I district of the first slicing layer low speed sintering by computer (30), described laser power is 2500
W, scanning speed is 8mm/s, powder feed rate 10g/min, and sweep length is 2mm.
A kind of laser 3D the most according to claim 8 prints the method for impeller of pump, it is characterised in that when in step E, laser beam (21) starts to carry out II district sintering at a high speed, laser power is 2000
W, scanning speed is 4mm/s, and powder feed rate is 20g/min, and sweep length is 3mm.
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| CN201410435407.7A CN104226996B (en) | 2014-08-31 | 2014-08-31 | A kind of laser 3D prints the device and method of impeller of pump |
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| CN201410435407.7A CN104226996B (en) | 2014-08-31 | 2014-08-31 | A kind of laser 3D prints the device and method of impeller of pump |
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