CN101342640A - Coaxial powder feeding system for quickly molding and producing functional gradient material with laser - Google Patents
Coaxial powder feeding system for quickly molding and producing functional gradient material with laser Download PDFInfo
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- CN101342640A CN101342640A CNA2007100120465A CN200710012046A CN101342640A CN 101342640 A CN101342640 A CN 101342640A CN A2007100120465 A CNA2007100120465 A CN A2007100120465A CN 200710012046 A CN200710012046 A CN 200710012046A CN 101342640 A CN101342640 A CN 101342640A
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Abstract
The invention relates to a coaxial powder feeding system of laser rapid prototyping preparation function gradient material, comprising a powder inlet device, and the powder is absorbed and conveyed by carrier gas. The powder inlet device is communicated with a powder mixer through a first conveying pipe. The powder mixer is used for mixing the powder which has been conveyed. The mixed powder enters into a powder separate device through a second conveying pie. The powder separate device is used for separating the mixed powder into multi-path. The powder separate device is communicated with the powder inlet of a nozzle through a third conveying pipe. The nozzle makes the multi-path powder flock together in a molten pool formed by laser. The function gradient material is prepared under the cladding action of laser and powder. The mix of the powder is uniform. The coaxial powder feeding system has good power feeding property, which can realize the optimum processing, and at the same time, can be suitable for different processing distances. The powder utilization rate is high. The manufacturing accuracy is good. At the same time, the powder conveying distance can be adjusted with a certain scope, and so the coaxial powder feeding system can not be limited to the manufacturing space.
Description
Technical field
The present invention relates to the powder feed system of FGM preparation in the material complex technique field, specifically a kind of coaxial powder feeding system of quickly molding and producing functional gradient material with laser.
Background technology
The research and development of FGM start from " relaxing the basic technology research of the FGM of thermal stress about exploitation " plan of Japanese Science And Technology Agency in 1987 the earliest.The called function functionally gradient material (FGM) is according to instructions for use, select to use the material of two kinds of different performances, adopt advanced material complex technique, The Nomenclature Composition and Structure of Complexes in the middle of making changes continuously in gradient, there is not tangible interface in inside, thereby makes the character of material and a kind of advanced composite material (ACM) that function also changes in gradient along thickness direction.Rapid laser-shaping technique is meant and adopts high-power laser beam when the substrate processing surface forms the molten bath, and it is molten mutually and form cladding layer to send into the molten bath by the defeated metal dust of protection fate.Along with laser beam and substrate carry out relative motion by the machining locus of prior design, to form cladding layer in substrate surface deposition, one deck deposition is whenever finished in Laser Processing, and coaxial nozzle is with the make progress height of translation one deck of relative substrate, continue deposition one deck down, finish until the part preparation.
The research that utilizes laser technology to prepare FGM begins early, and rapid laser-shaping technique prepares FGM and then just grows up recently.No matter be former technology or present rapid laser-shaping technique, the principle of its preparation FGM all is identical, all is to utilize high energy laser beam cladding composite powder, but its powder feeding but is not quite similar with the mode that produces gradient in preparation process.First method is to utilize powder to form functionally gradient material (FGM) in the free settling in molten bath.This method for preparing FGM comes from laser surface modification, its method is to shine on base material with laser beam earlier to produce bath, then in the molten bath of hot spot back followed by powder feeding end (will guarantee that powder can not contact with laser beam), cooling gradually along with the molten bath, powder gravitational settling in bath forms gradient layer naturally, this method powder feed system is simple in structure, but powder using efficiency is lower.Second method is to adopt to overlay the powder mode and form functionally gradient material (FGM).Employing overlays powder, and to prepare the method for FGM fairly simple, after at first mixing mixed-powder A, B, grind evenly with different ratios, in advance mixed-powder is coated in the matrix material specimen surface, pre-coating thickness is regulated voluntarily according to spot size and laser power, form the alloying layer of AB then with laser beam irradiation remelting specimen surface initialization layer, the shortcoming of this method is that powder is inhomogeneous, is difficult to form FGM truly, and the powder waste is more.
Summary of the invention
At the many deficiencies that exist in the above-mentioned prior art, the object of the present invention is to provide a kind of coaxial powder feeding system of carrying powder stable and uniform, powder using efficiency height, having the quickly molding and producing functional gradient material with laser of good powder feeding performance.
For achieving the above object, the technical solution used in the present invention is:
The present invention has powder-feeder, draws by carrier gas and transmits powder, is connected with powder blenders by the 1st carrier pipe; Powder blenders is to powder-feeder) powder sent into mixes, and enters powder separator through the 2nd carrier pipe; Powder separator with mixed powder demultiplexing, is connected with the powdering inlet of nozzle respectively by the 3rd carrier pipe; Nozzle converges at the multichannel powder in the molten bath of laser formation, under the cladding effect of laser and powder, finishes the preparation of FGM.
Described nozzle interior adopts three-decker, and internal layer is and the laser and the protection gas passage of the coaxial setting of nozzle that this channel outlet and nozzle meal outlet converge in spray nozzle front end portion; The second layer is powder stream chamber, and in the coaxial with it ring-type setting of skin of laser and protection gas passage, the powdering inlet in this powder stream chamber is distributed in nozzle middle part isometry position, and the dust outlet in powder stream chamber is the nozzle meal outlet; The 3rd layer is the 1st waterway, is located on powder stream chamber skin; Rear end at nozzle also has the 2nd waterway, is located on the skin of laser and protection gas passage; Be equipped with branch powder ring in the contour cross section of the powdering inlet of nozzle, be evenly equipped with a plurality of holes on the branch powder ring and promptly divide the powder annular distance; The front end of described nozzle is provided with the alignment hole, and the nozzle meal outlet is embedded in the front end of nozzle; The rear end of nozzle is provided with the adjusting adapter sleeve, by the adjustment screw of regulating on the adapter sleeve nozzle is carried out radiai adjustment; Described powder-feeder is a plurality of, and each powder-feeder has a dust outlet, is connected with powder blenders by the 1st carrier pipe respectively; Described powder-feeder has casing and powder bucket, powder bucket meal outlet is located at the upside of the ring groove of casing inner rotary table, relevant position at cannelure is provided with starch sucking nozzle, and this starch sucking nozzle links to each other with the blender powder inlet of powder blenders through dust outlet, the 1st carrier pipe by flour extraction pipe; Described rotating disk is connected to the output shaft of stepper motor by reductor.
The present invention has following beneficial effect and advantage:
1. powder is even.System of the present invention enters powder blenders by a plurality of equally distributed powder channels, and converge with the phase same rate at the vertex of a cone of powder blenders, guaranteed the mixing uniformity of multichannel powder at the meal outlet place of powder blenders, simultaneously owing in the 1st, 2 carrier pipes, feed high velocity carrier gas, make powder in carrier pipe, approach even distribution, be suspended state and carry, further improved the homogeneity question of powder.
2. has good powder feeding performance.The present invention can carry multiple different powder simultaneously with system, can realize continuous adjusting in 1～150g/min scope, powder feeding is easily control evenly, and has avoided the poly-group and the viscous of powder, can well control the proportioning between powder, realize that the material gradient between the multiple alloy cladding layer changes.
3. can realize optimum processing, also can adapt to different processing distances simultaneously.System of the present invention is provided with the adjusting adapter sleeve in the nozzle rear end, can regulate the size of laser spot size, can also regulate powder a fluid stream focal position to adapt to different processing distances, realizes optimum processing.
4. powder using efficiency height, the accuracy of manufacture is good.The present invention designs the convergence diameter of the powder that goes out from nozzle ejection according to the size in hot spot molten bath, can be that more powder enters the molten bath and forms cladding layer like this, thereby reduce the waste of powder; Owing to be coaxial powder-feeding, only just carry out the cladding of powder at machining area, non-machining area does not have overlaying of powder, reduce cost and reduce following process, simultaneously owing to can well control the conveying capacity of powder, the width in each molten road and thickness have obtained control preferably, and the flatness of whole cladding layer is less, accuracy of manufacture height.
5. the powder fed distance is adjustable within the specific limits, is not made spatial constraints.Link to each other by the 1st～3 carrier pipe between each parts of system of the present invention, putting of system's component suited measures to local conditions, and be easy for installation.
Description of drawings
Fig. 1 is a system global structure block diagram of the present invention;
Fig. 2 is powder-feeder structural representation in the system of the present invention;
Fig. 3 A is powder blenders structural front view in the system of the present invention;
Fig. 3 B is powder blenders structure upward view in the system of the present invention;
Fig. 4 A is powder separator structural front view in the system of the present invention;
Fig. 4 B is powder separator structure vertical view in the system of the present invention;
Fig. 5 is nozzle arrangements schematic diagram in the system of the present invention;
Fig. 6 A is for dividing powder ring structure front view in the system of the present invention nozzle;
Fig. 6 B is for dividing powder ring structure vertical view in the system of the present invention nozzle.
The specific embodiment
The present invention is for preparing the system of FGM by rapid laser-shaping technique, by improving the powder feed system of Laser Rapid Prototyping System, make it can carry dusty material more than 2 kinds simultaneously, and can regulate control to the ratio of different dusty materials as required.For quantitative feeding, mixing, branch powder and the injection cladding that can in the laser fast shaping process, realize alloy powder, as shown in Figure 1, system of the present invention mainly is made up of five parts: powder-feeder 1, powder blenders 2, powder separator 3, nozzle 4 and control device.Wherein powder-feeder 1, draws by carrier gas and transmits powder, and its meal outlet is connected by three inlets of the 1st carrier pipe 5 (3) and powder blenders; Powder blenders 2, the powder that powder-feeder 1 is sent into mixes, and enters the inlet of powder separator 3 through the 2nd carrier pipe 6 (); Powder separator 3 with the even demultiplexing of mixed powder, is connected with 4 powdering inlets of nozzle 4 respectively by the 3rd carrier pipe 7 (4); Nozzle 4 converges at the multichannel powder in the molten bath of laser formation, under the cladding effect of laser and powder, finishes the preparation of FGM.
As shown in Figure 2, described powder-feeder 1, it has casing 13 and powder bucket 11, powder bucket meal outlet is located at the upside of the ring groove of casing 13 inner rotary tables 15, be provided with starch sucking nozzle 14 in the relevant position of cannelure, this starch sucking nozzle 14 links to each other with the powder inlet of powder blenders 2 through dust outlet, the 1st carrier pipe 5 by flour extraction pipe 12; Described rotating disk 15 is connected to the output shaft of stepper motor 16 by reductor 17.
As shown in Figure 5, described nozzle 4 is a coaxial powder-feeding nozzle, the inner three-decker that adopts, internal layer are and the laser of being used to logical nozzle 4 rear ends and front end and the protection gas passage 406 of nozzle 4 coaxial settings that this laser and 406 outlets of protection gas passage and nozzle meal outlet 410 converge at nozzle 4 leading sections; The second layer is powder stream chamber 409, and in the coaxial with it ring-type setting of skin of laser and protection gas passage 406, the powdering inlet in this powder stream chamber 409 is distributed in nozzle 4 middle part isometry positions, and the dust outlet in powder stream chamber 409 is nozzle meal outlet 410; The 3rd layer is the 1st waterway 408, is located on powder stream chamber 409 skins; Described rear end at nozzle 4 also has the 2nd waterway 403, is located on the skin of laser and protection gas passage 406; Be equipped with branch powder ring 407 at the contour section of the powdering inlet of nozzle 4, be evenly equipped with a plurality of minutes powder annular distances 4071 (shown in Fig. 6 A, 6B) on this minute powder ring 407, the hole; The front end of described nozzle 4 is provided with alignment hole 411, and nozzle meal outlet 410 is embedded in the front end of nozzle 4; The rear end of nozzle 4 is provided with regulates adapter sleeve 402, carries out radiai adjustment by 401 pairs of nozzles of adjustment screw 4 of regulating on the adapter sleeve 402.
Comprise three independently powder-feeders 1 in the present embodiment, its dust outlet links to each other with three powder inlets 23 of powder blenders 2 by 3 the 1st carrier pipes 5 respectively.Powder blenders 2 is one three and advances a device that outes, mixed powder enters powder separator 3 through the 2nd carrier pipe 6, this powder separator 3 is one one and advances four devices that go out, and it is divided into four tunnel four powdering inlets delivering to nozzle 4 respectively with powder, again by the meal outlet ejection of nozzle 4.
The working condition of powder-feeder 1 directly determines the stability and the uniformity of powder mass flow, thereby influences the overall process of metal function forming parts.Powder-feeder is based on the aerodynamics principle, and by the absorption transmission powder of carrier gas, it is a kind of novel powder-feeder of designing on the basis of scraping suction formula powder-feeder and rotating disk scraper-type powder-feeder.The cannelure that the certain width and the degree of depth are arranged on the rotating disk of powder-feeder 1 of the present invention is driven by reductor 17 by stepper motor 16 and to rotate, powder from the outlet of powder bucket in the effect of gravity and air pressure drops to the cannelure of rotating disk 15 and evenly distribute.Current-carrying gas is sent powder by starch sucking nozzle 14 with the form that flows.The conveying capacity of powder is by the rotating speed control of cannelure shape, size and rotating disk.Rotating disk is through processing, and the cannelure shape and size are certain, and the powder flow is by the distance control of powder bucket outlet with cannelure, and then powder sending quantity is only determined by rotary speed.The powder course of conveying adopts closed carrier gas system, carries by the air pressing type strength, helps flow of powder and mixing.In order to realize the independent respectively rotating speed of controlling rotating disk accurately of three powder-feeders 1, select the little stepper motor of step angle 16 for use, and (1/50-1/70, this implementation column adopts 1/60) is connected with rotating disk 15 by the bigger reductor 17 of speed ratio, makes rotating disk that more accurate rotating speed be arranged.
Shown in Fig. 3 A, 3B, the operation principle of powder blenders is to adopt on the cone to open equally distributed a plurality of powder channel (present embodiment is 3), passage is wide at the top and narrow at the bottom, powder enters from blender powder inlet 21, from blender, move to the vertex of a cone at the bottom of the awl of powder awl 22 then, send from meal outlet 23 at last, powder particle has higher speed by carrier gas when powder-feeder transfers out, guaranteed that under the promotion of carrier gas powder particle travels forward, assemble mixing at vertex of a cone place, and at the mixing uniformity that when blender meal outlet 23 comes out, can guarantee powder.Because delivery air speed is bigger, powder enters the 2nd carrier pipe 6 backs and approach even distribution in pipe, is suspended state and carries, and mixed-powder is uniformly dispersed and smooth transportation easily like this, and conveyance conduit can not stop up, and has further improved the inhomogeneity problem of powder.
A key issue that realizes laser coaxial powder feeding is to obtain the powder stream that the circle with the coaxial output of laser beam distributes symmetrically and evenly, adopts multichannel powder feeding synthetic schemes for this reason.Shown in Fig. 4 A, 4B, the structure of powder separator 3 is similar to powder blenders 2.Just powder moves to the awl end along powder awl 32 from the vertex of a cone through powder separator powder inlet 31, enters a plurality of powder channels (present embodiment is 4) then, and powder separator meal outlet 33 flows out at the bottom of the awl of powder awl 32 respectively, sends into 4 powder inlets of nozzle 4 through 4 the 2nd carrier pipes.
It is high more that the basic functions of nozzle 4 comprises that evenly converging of logical light and powder, powder are converged degree, and then powder using efficiency is high more, the accuracy of manufacture is high more.Because nozzle and molten bath distance are very near, the radiant heat in molten bath easily makes nozzle-end heat up, and causes stifled powder of nozzle or damage, therefore the water-cooled function will be arranged.The non-oxidizability difference of different powder, nozzle also design usually the inert gas path, with the protection molten bath.And the present invention's employing feeds inert gas as carrier gas in powder stream chamber; promptly play the powder effect of carrying; play the not oxidized effect of protection powder again; so nozzle 4 has adopted three-decker from inside to outside; internal layer leads to laser, is connected with coaxial protection gas (helium) simultaneously and guarantees the not contaminated and shaping powder a fluid stream of lens.The second layer is a powder channel---powder stream chamber 409, powder arrives annular meal outlet 410 through powder stream chamber 409, converges and enters the light beam active region, absorbs energy through the interaction with laser and arrives matrix, enters molten bath cooling after coagulation and forms coating.Carry the carrier gas (argon gas) of powder to completely cut off that high-temperature fusant contacts with the direct of air in the laser molten pool, guaranteed that well the successful land productivity lf of matrix surface is laminated with the prerequisite of gold copper-base alloy.The 3rd layer is the water-cooled part, comprise the 1st waterway 408 and the 2nd waterway 403, the recirculated water cooling is all adopted in the combination of inner and outside, for preventing that the nozzle 4 overheated nozzles that cause block up powder or damage in the process, all adopt Welding Structure to form waterway at the parts near the molten bath, inject cold water by the water-cooled unit in waterway, circulating water flow can in time be taken away because of the long-time heat that is accumulated on the nozzle 4 of processing, prevent that nozzle is overheated, guarantee the stable of the course of work.The meal outlet of nozzle 4 adopts insert structure, and adds the alignment hole, through dimensionally-optimised, makes the distance that 1～3mm is arranged between meal outlet and the alignment hole, both can prevent that powder from stopping up, and can make powder well converge again.
Present embodiment calculates by theory when the design nozzle arrangements, and the formed fan-shaped central angle of powder curtain that powder bundle collision back forms is slightly larger than 90 °, so adopt the uniform automatic powder feeding system of No. four tube cells in design, can form the powder curtain of a sealing.In order to make powder have better flowability and convergence, the 3rd carrier pipe 7 is connected with copper pipe on the nozzle 4, the outlet axis of this copper pipe and powder stream chamber normal be (25～35 degree at an angle, present embodiment adopts 30 degree), advance along the internal chamber wall hand of spiral when powder enters powder stream chamber like this, avoid powder directly to clash into internal chamber wall, and make the powder four lost convergencies that flow of going.Powder will be through undue powder ring 407 before entering powder stream chamber, divide the powder ring to be provided with 36 branch powder annular distance 4071 holes in the present embodiment, its effect has two: the one, and powder is further mixed, the 2nd, the spiral direction of advance of change powder, powder is flowed along conical surface axis direction, begin to converge.
In order to make powder stream better poly-, powder stream chamber adopts little internal diameter to converge the angle greatly, and carries out dimensionally-optimised to meal outlet and alignment hole 411.
In the cladding process to molten road width (be on the matrix laser sustained height left or the width of the cladding that moves right) require differently, so nozzle 4 also design the function that the adjusting spot size is arranged, to obtain the different molten road of width; In order to possess the function of regulating focal position and spot size, light beam can be penetrated from the central axis of nozzle, guarantee symmetry, system of the present invention regulates adapter sleeve 402 one of nozzle rear end design, be connected respectively with nozzle and light path outlet by the screw thread of regulating adapter sleeve 402 two ends, regulate the size of spot size by length of thread engagement; Regulate adapter sleeve 402 4 adjustment screw 401 that radially evenly distribute, can regulate the focal position, in case mix up, locked by locking nut, finished adjustment process.
For the ease of processing, these parts adopt split type, are made up of two parts, and in order to guarantee the axiality of various piece, adopt orientation axes 404 location, thread connecting mode 405.Former nozzle generally adopts four-layer structure, complex structure, and screw thread is all adopted with being connected in the location, and the axiality of each parts is reduced.Cavity is tapered, and length is big, belongs to deep hole, and difficulty of processing is big, and manufacturability is poor.
In the present embodiment, the major function of control device is, machining path file at function of processing functionally gradient material (FGM) part, scan mode, sweep span, performance requirement and working (machining) efficiency, under the prerequisite of selecting suitable Laser Processing power, powder feeding motor to 3 powder-feeders 1, powder as requested is than setting velocity of rotation, and send corresponding pulse command to stepper motor 16 drivers of powder-feeder 1, stepper motor 16 drives the powder that rotating disk 15 receives corresponding proportion in real time, under the effect of carrier gas, carry powder by starch sucking nozzle 14 and the 1st carrier pipe 5, and in powder blenders 2, be mixed into the required functionally gradient material (FGM) powder of processing to powder blenders 2.
The course of work of the present invention is as follows:
The conveying, proportioning that system of the present invention carries out powder in process mix, divide powder and with the coaxial injection of laser.The specific implementation process is: the current-carrying gas of extraneous source of the gas enters the casing 13 and the powder bucket 11 of powder-feeder 1, makes in casing 13 and the powder bucket 11 to be full of balanced gas.Stepper motor 16 is connected with control device by hardware interface, ratio requirement according to different powder, stepper motor 16 produces different rotating speeds, driving rotating disk 15 by reductor rotates, the powder that is evenly distributed on by powder bucket meal outlet in the cannelure of rotating disk 15 enters starch sucking nozzle 14 by the air pressing type mode of movement, transfers out powder-feeder 1.Three kinds of different powder advance the powder passage by the 1st carrier pipe 5 by three tunnel of powder blenders 2 and enter, the place converges mixing at the vertex of a cone, enter the 2nd carrier pipe 6, powder is with even distribution in the 2nd carrier pipe 6, suspended state is carried, and (powder further mixes the certain distance of flowing through in 1.5～3m) the 2nd carrier pipe 6, enters powder separator 3 then, be split into four road powder, send coaxial nozzle 4 to.Powder arrives annular meal outlet through undue powder annular distance 4071 and powder stream chamber 409, converges and enters the light beam active region, absorbs energy through the interaction with laser and arrives matrix, falls into molten bath cooling after coagulation and forms coating.
System of the present invention important technological parameters index is as follows:
System's gross weight: 32Kg; Flow rate of carrier gas: 15～20m/s; Powder diameter: 20～150 μ m; Powder conveying capacity: 1～150g/min; Powder sending quantity error＜3%; Repeat powder sending quantity error＜1%; The powder of nozzle converges diameter: 2～4mm; Nozzle is apart from matrix distance: 14～18mm; Powder fed distance: 1.5～3m.
Claims (9)
1. the coaxial powder feeding system of a quickly molding and producing functional gradient material with laser is characterized in that having:
Powder-feeder (1) is drawn the transmission powder by carrier gas, is connected with powder blenders (2) by the 1st carrier pipe (5);
Powder blenders (2), the powder that powder-feeder (1) is sent into mixes, and enters powder separator (3) through the 2nd carrier pipe (6);
Powder separator (3) with mixed powder demultiplexing, is connected with the powdering inlet of nozzle (4) respectively by the 3rd carrier pipe (7);
Nozzle (4) converges at the multichannel powder in the molten bath of laser formation, under the cladding effect of laser and powder, finishes the preparation of FGM.
2. press the coaxial powder feeding system of the described quickly molding and producing functional gradient material with laser of claim 1, it is characterized in that: the inner three-decker that adopts of nozzle (4), internal layer is and the laser and the protection gas passage (406) of the coaxial setting of nozzle (4) that this channel outlet and nozzle meal outlet (410) converge at nozzle (4) leading section; The second layer is powder stream chamber (409), the coaxial with it ring-type setting of skin in laser and protection gas passage (406), the powdering inlet in this powder stream chamber (409) is distributed in nozzle (4) middle part isometry position, and the dust outlet in powder stream chamber (409) is nozzle meal outlet (410); The 3rd layer is the 1st waterway (408), is located on powder stream chamber (409) skin.
3. by the coaxial powder feeding system of the described quickly molding and producing functional gradient material with laser of claim 2, it is characterized in that: also have the 2nd waterway (403) in the rear end of nozzle (4), be located on the skin of laser and protection gas passage (406).
4. press the coaxial powder feeding system of the described quickly molding and producing functional gradient material with laser of claim 2, it is characterized in that: the contour cross section of powdering inlet at nozzle (4) is equipped with branch powder (407), is evenly equipped with a plurality of holes on the branch powder (407) and promptly divides powder annular distance (4071).
5. by the coaxial powder feeding system of the described quickly molding and producing functional gradient material with laser of claim 2, it is characterized in that: the front end of described nozzle (4) is provided with alignment hole (411), and nozzle meal outlet (410) is embedded in the front end of nozzle (4).
6. press the coaxial powder feeding system of the described quickly molding and producing functional gradient material with laser of claim 2, it is characterized in that: the rear end of nozzle (4) is provided with regulates adapter sleeve (402), by the adjustment screw (401) of regulating on the adapter sleeve (402) nozzle (4) is carried out radiai adjustment.
7. press the coaxial powder feeding system of the described quickly molding and producing functional gradient material with laser of claim 1, it is characterized in that: described powder-feeder (1) is for a plurality of, each powder-feeder has a dust outlet, is connected with powder blenders (2) by the 1st carrier pipe (5) respectively.
8. press the coaxial powder feeding system of the described quickly molding and producing functional gradient material with laser of claim 1, it is characterized in that: described powder-feeder (1) has casing (13) and powder bucket (11), powder bucket meal outlet is located at the upside of the ring groove of casing (13) inner rotary table (15), be provided with starch sucking nozzle (13) in the relevant position of cannelure, this starch sucking nozzle (13) links to each other with the blender powder inlet (23) of powder blenders (2) through dust outlet, the 1st carrier pipe (5) by flour extraction pipe (12).
9. by the coaxial powder feeding system of the described quickly molding and producing functional gradient material with laser of claim 8, it is characterized in that: described rotating disk (15) is connected to the output shaft of stepper motor (16) by reductor (17).
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| CN1155449C (en) * | 2002-03-21 | 2004-06-30 | 西北工业大学 | Component and tissue controllable laser stereoforming method |
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