CN112024876B - 3D printing ultrasonic small-aperture uniform powder feeding method and device - Google Patents
3D printing ultrasonic small-aperture uniform powder feeding method and device Download PDFInfo
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- CN112024876B CN112024876B CN202010888811.5A CN202010888811A CN112024876B CN 112024876 B CN112024876 B CN 112024876B CN 202010888811 A CN202010888811 A CN 202010888811A CN 112024876 B CN112024876 B CN 112024876B
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- 239000000843 powder Substances 0.000 title claims abstract description 86
- 238000010146 3D printing Methods 0.000 title claims abstract description 13
- 238000000034 method Methods 0.000 title abstract description 7
- 239000000463 material Substances 0.000 claims abstract description 19
- 230000005540 biological transmission Effects 0.000 claims description 11
- 239000000919 ceramic Substances 0.000 claims description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 9
- 229910052802 copper Inorganic materials 0.000 claims description 9
- 239000010949 copper Substances 0.000 claims description 9
- 238000012545 processing Methods 0.000 claims description 6
- 239000007769 metal material Substances 0.000 claims description 4
- 230000007704 transition Effects 0.000 claims description 3
- 238000002604 ultrasonography Methods 0.000 claims 5
- 239000002184 metal Substances 0.000 abstract description 11
- 229910052751 metal Inorganic materials 0.000 abstract description 11
- 230000005284 excitation Effects 0.000 abstract description 4
- 238000009835 boiling Methods 0.000 abstract 1
- 239000010419 fine particle Substances 0.000 abstract 1
- 238000004372 laser cladding Methods 0.000 abstract 1
- 238000007873 sieving Methods 0.000 abstract 1
- 238000013461 design Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 238000007639 printing Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000009347 mechanical transmission Effects 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
- B33Y40/10—Pre-treatment
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Abstract
The invention discloses a 3D printing ultrasonic small-aperture uniform powder feeding method and a device, which comprises an external frame, an ultrasonic hollow vibration device, a fixed amplitude transformer frame, a transverse plate, a material cavity, an angle-adjustable side plate, a pneumatic cylinder guide rail device and an ultrasonic power supply, wherein the ultrasonic hollow vibration device is connected with the material cavity through a plurality of ultrasonic hollow vibration devices fixed on the transverse plate, and the ultrasonic power supply generates corresponding high-frequency vibration under the driving of an excitation signal so as to cause the vibration of metal powder in an ultrasonic hollow channel, so that a 'sieving and shaking' effect is generated at a small-aperture powder falling pipe orifice to achieve the continuous and uniform falling of the metal powder and break through the traditional mechanical and gas boiling type powder falling; the angle between the ultrasonic vibration device and the workbench can be adjusted through the angle-adjustable side plate; the problem of traditional powder device fine particle, aperture powder that fall are inhomogeneous, discontinuous is solved, not only can be applicable to 3D and print the powder feeding device, also is applicable to the laser cladding and welds the powder feeding device requirement.
Description
The technical field is as follows:
the invention relates to the technical field of 3D printing additive machining and manufacturing, in particular to a method and a device for uniformly feeding powder in a small-aperture ultrasonic 3D printing mode.
The background art comprises the following steps:
the 3D printing is a new fast forming technology, which utilizes a computer digital model structure body model and utilizes materials such as metal powder or plastic to perform additive printing layer by layer, effectively solves the problem that the traditional processing technology can not process complex structures, is suitable for workpieces with various complex shapes, and has the technical problems that the core element of the traditional processing technology, namely a powder feeding device, is troubled, and the traditional powder feeding device has mechanical and pneumatic modes, has high manufacturing cost and can not convey small-particle powder. Along with scientific and technological development, require more and more high to 3D printing powder diameter, and the powder that the metal particle diameter is less than 1.0mm is easy to reunite and the viscosity in the powder circumstances of falling at the small bore diameter syringe needle, and the mobility is relatively poor, consequently carries very difficultly, can not guarantee continuity, the homogeneity of falling powder to lead to 3D to print the inhomogeneous, surface quality is poor, seriously influences the quality that 3D printed the shaping part, at present urgently need a simple structure and supersound small bore evenly send whitewashed device.
The invention content is as follows:
the technical problem to be solved by the invention is as follows: the method and the device for uniformly feeding the powder in the small-aperture ultrasonic printing mode overcome the defects of the prior art, are reasonable in design and simple in structure, and achieve the continuity and uniformity of powder falling of the superfine metal powder under the condition of small-aperture powder falling and the small powder falling area.
The technical scheme of the invention is as follows:
A3D printing ultrasonic small-aperture uniform powder feeding method comprises the following steps:
a. arranging an ultrasonic hollow vibration device, wherein the ultrasonic hollow vibration device comprises an ultrasonic hollow transducer and an ultrasonic hollow amplitude transformer which are connected through a hollow bolt to form an internal powder falling channel, and the lower end of the internal powder falling channel is provided with a small-aperture powder outlet;
b. fixing an ultrasonic hollow vibration device on a fixed amplitude transformer frame, wherein the upper end of the ultrasonic hollow vibration device is communicated with the lower end of the material cavity;
c. the ultrasonic hollow transducer is connected with an ultrasonic power supply, and under the drive of an ultrasonic excitation signal, the ultrasonic hollow transducer drives the ultrasonic hollow amplitude transformer to vibrate, so that the metal powder in the internal powder falling channel vibrates, and the agglomeration and the adhesion of the metal powder caused by the self weight and the pressure are avoided.
The ultrasonic hollow transducer comprises a piezoelectric ceramic piece, a copper electrode, a reflection end, a transmission end and a hollow bolt, wherein the piezoelectric ceramic piece, the copper electrode, the reflection end and the transmission end are designed in a sandwich mode, the frequency of the piezoelectric ceramic piece, the copper electrode, the reflection end and the transmission end are designed according to 20KHz, the structural size of the piezoelectric ceramic piece meets the requirement of 'one-half wavelength', and the piezoelectric ceramic piece, the copper electrode, the reflection end, the transmission end and the transmission end are connected through the hollow bolt to form a hollow inner channel.
The ultrasonic hollow amplitude transformer comprises a primary amplitude transformer, a flange and a secondary amplitude transformer, the frequency of the ultrasonic hollow amplitude transformer is designed according to 20KHz, the structural size meets the design requirement of 'whole wavelength', a flange plate is arranged at the node of the amplitude transformer, an internal threaded hole is formed at the large end of the primary amplitude transformer, and the ultrasonic hollow transducer and the ultrasonic hollow amplitude transformer are in threaded connection by using a high-strength external hexagonal hollow bolt; and a powder outlet with a required small aperture is formed at the small end of the secondary amplitude transformer by laser processing, and the powder falling hole with the small aperture outlet being 0.3mm-1.0 mm.
The ultrasonic power supply converts low-frequency current into high-frequency current, at least one ultrasonic power supply is arranged on the external frame and is controlled by a PLC program, and the power supply power is changed or one or more ultrasonic vibration devices are respectively excited according to requirements so as to realize single-hole accurate powder feeding or multi-hole quantitative powder feeding; the frequency of the output signal of the ultrasonic power supply is not less than 15kHz, and the voltage is 220V.
A3D printing ultrasonic small-aperture uniform powder feeding device comprises an external frame, an ultrasonic hollow vibration device and a fixed amplitude transformer frame, wherein the left side and the right side of the external frame are respectively provided with a linear guide rail and a sliding block, the sliding block on the same side is connected with an angle-adjustable side plate, the upper end of each angle-adjustable side plate is connected with a piston rod of a pneumatic cylinder, the pneumatic cylinder is fixed at the upper end of the external frame, a transverse plate is arranged between the two angle-adjustable side plates, at least one fixed amplitude transformer frame is arranged on the transverse plate, one ultrasonic hollow vibration device is arranged in each fixed amplitude transformer frame, the ultrasonic hollow vibration device comprises an ultrasonic hollow transducer and an ultrasonic hollow amplitude transformer, the ultrasonic hollow transducer and the ultrasonic hollow amplitude transformer are connected through a hollow bolt to form an internal powder falling channel, and the lower end of the internal powder falling channel is a small-aperture powder outlet, the upper end of the ultrasonic hollow vibration device is communicated with the lower end of the material cavity, the material cavity is arranged on the transverse plate, the ultrasonic hollow transducer is connected with an ultrasonic power supply, and the small-aperture powder outlet is a powder falling hole with the diameter of 0.3mm-1.0 mm.
The ultrasonic hollow vibration device comprises a transverse plate, positioning holes are formed in the two angle-adjustable side plates at intervals, the positioning holes are arranged in an arc shape, the positioning holes in the two angle-adjustable side plates correspond to each other, and the left end and the right end of the transverse plate are connected with the positioning holes through pins or bolts respectively, so that the inclination angle of the ultrasonic hollow vibration device can be adjusted.
But be provided with moving work platform on external frame's the base, every side of external frame linear guide has two, the slider is four, four the slider divide equally do not with but angle regulation curb plate is connected, but angle regulation curb plate is L type structure, its upper end side with the piston rod of pneumatic cylinder is connected.
The ultrasonic hollow transducer comprises a piezoelectric ceramic piece, a copper electrode, a reflecting end and a transmission end, and is connected by a hollow bolt to form a hollow inner channel.
The ultrasonic hollow amplitude transformer comprises a primary amplitude transformer, a flange and a secondary amplitude transformer, a flange plate is arranged at the node of the amplitude transformer, and the flange plate is in clearance fit in a flange positioning groove on a fixed amplitude transformer frame and is pre-tightened through a countersunk bolt; the uppermost end of the fixed amplitude transformer frame is provided with a threaded hole, the fixed amplitude transformer frame is fixedly connected to the transverse plate by adopting an internal hexagonal bolt, the large end of the primary amplitude transformer is provided with an internal threaded hole, and the ultrasonic hollow transducer and the ultrasonic hollow amplitude transformer are in threaded connection by utilizing a high-strength external hexagonal hollow bolt; and a powder outlet with a required small aperture is formed at the small end of the secondary amplitude transformer by laser processing.
The material cavity adopts conical transition, so that the metal material can slide down conveniently; the ultrasonic power supply converts low-frequency current into high-frequency current, the whole device adopts a plurality of ultrasonic power supplies, and is controlled by a PLC program, and the power supply power can be changed or a single or a plurality of ultrasonic vibration devices can be excited respectively according to requirements, so that single-hole accurate powder feeding or multi-hole quantitative powder feeding is realized. The frequency of the output signal of the ultrasonic power supply is not less than 15kHz, and the voltage is 220V.
The invention has the beneficial effects that:
1. the invention breaks through the problem of powder falling in the traditional mechanical transmission way, effectively solves the problems of agglomeration and viscosity of superfine metal powder by exciting the ultrasonic hollow vibrating device to generate high-frequency vibration, and realizes the uniformity and continuity of powder falling.
2. According to the invention, the ultrasonic hollow vibration devices are connected with the material cavity, and under the excitation of ultrasonic power signals, powder falling in a single-pipeline precise positioning mode or powder falling in multiple types of metal powder in multiple pipelines simultaneously can be realized, so that the powder falling efficiency is greatly improved.
3. The invention realizes the combination of the powder falling channel and the ultrasonic device, and effectively reduces the space occupation ratio of the external loading device, thereby realizing the simplification and miniaturization of the structure of the device, effectively reducing the diameter of the powder falling hole, and better meeting the requirements of the prior small aperture, small particle and small powder falling area.
4. The ultrasonic hollow vibration device can adjust the angle through the angle-adjustable side plate so as to change the angle between the device and the workbench, thereby changing the powder falling flow and the powder falling area.
5. The ultrasonic vibration device utilizes the PLC to control the ultrasonic power supply, realizes the automatic control of the power output of the ultrasonic power supply, can effectively adjust the influence of the amplitude on the powder falling quantity, has the frequency of an output signal of the ultrasonic power supply not less than 15kHz and the voltage of 220V, is easy to popularize and implement, and has good economic benefit.
Description of the drawings:
FIG. 1 is a schematic structural diagram of a 3D printing ultrasonic small-aperture uniform powder feeding device;
FIG. 2 is a schematic structural view of the outer frame of FIG. 1;
FIG. 3 is a schematic structural view of the ultrasonic hollow vibration device of FIG. 1;
FIG. 4 is a schematic view of the fixed horn frame of FIG. 1;
FIG. 5 is a schematic structural view of the cross plate in FIG. 1;
FIG. 6 is a schematic view of the adjustable angle side plate of FIG. 1;
fig. 7 is a schematic structural view of the material chamber in fig. 1.
The specific implementation mode is as follows:
example (b): referring to fig. 1-7, in the drawings, 1-an external frame, 2-an ultrasonic hollow vibration device, 3-a fixed amplitude transformer frame, 4-a transverse plate, 5-an angle-adjustable side plate, 6-a material cavity, 7-a slide block, 8-a pneumatic cylinder, 9-an ultrasonic power supply, 10-a movable workbench, 11-a linear guide rail, 12-a pneumatic cylinder installation groove, 13-an ultrasonic hollow amplitude transformer, 14-a hollow internal channel, 15-a hollow transducer, 16-a flange positioning groove, 17-a material cavity installation groove, 18-a transverse plate angle adjusting hole and 19-a pneumatic cylinder connecting hole.
3D prints even powder feeding device in supersound aperture, its technical scheme is: the ultrasonic small-aperture uniform powder feeding device comprises an external frame, an ultrasonic hollow vibration device, a fixed amplitude transformer frame, a transverse plate, a material cavity, an angle-adjustable side plate, a pneumatic cylinder guide rail device and an ultrasonic power supply.
The base of the external frame 1 is provided with a movable working platform 10, two side edges of which are provided with linear guide rails 11, and a slide block 7 for fixing the angle-adjustable side plate 5 is arranged on the movable working platform for adjusting and fixing the height of the ultrasonic hollow vibration device 2, and the uppermost end of the external frame 1 is reserved with a pneumatic cylinder mounting groove 19 for positioning, mounting and fixing the pneumatic cylinder 8.
The bottom of the fixed amplitude transformer frame 3 is provided with a flange positioning groove 16, and the bottom of the flange positioning groove 16 is provided with four uniformly distributed internal thread holes so as to facilitate the positioning, installation and fixation of a flange plate; the uppermost end of the fixed amplitude transformer frame 3 is provided with a threaded hole and is connected and fixed on the transverse plate 4 by adopting an inner hexagonal bolt.
The ultrasonic hollow vibration device 2 comprises an ultrasonic hollow transducer 15 and an ultrasonic hollow amplitude transformer 13, the ultrasonic hollow vibration device 2 is connected through a hollow bolt to form an internal powder falling channel 14, the function of the ultrasonic hollow vibration device can realize that metal materials pass through the ultrasonic hollow inner pipeline 14, and the ultrasonic vibration device is additionally provided with ultrasonic vibration to realize uniform powder feeding with small aperture diameter so as to reduce the external load space occupation ratio; the ultrasonic small-aperture powder feeding device can realize the installation of a plurality of ultrasonic hollow vibration devices 2 by utilizing the transverse plate 4 so as to meet the requirement of uniformly feeding powder at various multiple points.
The ultrasonic power supply 9 converts low-frequency current into high-frequency current, the whole powder feeding device adopts a plurality of ultrasonic power supplies 9, and is controlled by a PLC program, and power supply power can be changed or single or a plurality of ultrasonic vibration devices 2 can be excited respectively according to requirements, so that single-hole accurate powder feeding or multi-hole quantitative powder feeding is realized. The frequency of the output signal of the ultrasonic power supply 9 is not less than 15kHz, and the voltage is 220V.
The ultrasonic hollow transducer 15 comprises a piezoelectric ceramic piece, a copper electrode, a reflection end, a transmission end and a hollow bolt, the piezoelectric ceramic piece, the copper electrode, the reflection end and the transmission end are designed in a sandwich mode, the frequency of the piezoelectric ceramic piece, the copper electrode, the reflection end and the transmission end is designed according to 20KHz, the structural size of the ultrasonic hollow transducer meets the design requirement of 'one-half wavelength', and the ultrasonic hollow transducer is connected with the transmission end by the hollow bolt to form a hollow inner channel 14; under the drive of the ultrasonic excitation signal, the hollow transducer 15 drives the hollow amplitude transformer 13 to vibrate, so that the metal powder in the hollow amplitude transformer vibrates, and the metal powder is prevented from being solidified due to the self weight and pressure.
The ultrasonic hollow amplitude transformer 13 comprises a primary amplitude transformer, a flange and a secondary amplitude transformer, the frequency of the ultrasonic hollow amplitude transformer is designed according to 20KHz, the structural size of the ultrasonic hollow amplitude transformer meets the design requirement of 'whole wavelength', a flange plate is arranged at the node of the amplitude transformer, the flange is in clearance fit in a flange positioning groove 16 on the fixed amplitude transformer frame 3 and is pre-tightened through a countersunk bolt; an internal threaded hole is formed at the large end of the primary amplitude transformer, and the ultrasonic hollow transducer 15 and the ultrasonic hollow amplitude transformer 13 are in threaded connection by using a high-strength external hexagonal hollow bolt; and the small end of the secondary amplitude transformer is provided with a required small-aperture (0.3 mm-1.0 mm) powder falling hole by laser processing.
The device comprises a transverse plate 4 and a material cavity 6, wherein the transverse plate 4 is provided with a plurality of material cavity mounting grooves 17 for mounting and fixing the material cavity 6, and the side edge of the transverse plate is also provided with a threaded hole and fixed on an angle-adjustable side plate 5 through a bolt; the material cavity 6 adopts conical transition to facilitate the gliding of the metal materials.
But angle regulation curb plate 5 adopts L type design, and fixes on both sides slider 7 to open threaded hole on its top for be connected with pneumatic cylinder 8, in order to reach the adjustability of the upper and lower height of device, seted up different angle diaphragm mounting holes 18 at the side, so that the angle of supersound cavity vibrating device 2 changes, thereby change metal powder's whereabouts volume and whereabouts area.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications, equivalent variations and modifications made to the above embodiment according to the technical spirit of the present invention still fall within the scope of the technical solution of the present invention.
Claims (6)
1. The utility model provides a 3D prints even powder feeding device of supersound aperture, includes external frame, supersound cavity vibrating device and fixed amplitude transformer frame, characterized by: the left side and the right side of the external frame are respectively provided with a linear guide rail and a slide block, the slide block on the same side is connected with an angle-adjustable side plate, the upper end of each angle-adjustable side plate is connected with a piston rod of a pneumatic cylinder, the pneumatic cylinder is fixed at the upper end of the external frame, a transverse plate is arranged between the two angle-adjustable side plates, at least one fixed amplitude transformer frame is arranged on the transverse plate, one ultrasonic hollow vibration device is arranged in each fixed amplitude transformer frame and comprises an ultrasonic hollow transducer and an ultrasonic hollow amplitude transformer which are connected through a hollow bolt to form an internal powder falling channel, the lower end of the internal powder falling channel is a small-bore powder outlet, the upper end of the ultrasonic hollow vibration device is communicated with the lower end of a material cavity, and the material cavity is arranged on the transverse plate, the ultrasonic hollow transducer is connected with an ultrasonic power supply, and the small-aperture powder outlet is a powder falling hole with the diameter of 0.3mm-1.0 mm.
2. The small-aperture uniform powder feeding device for 3D printing ultrasound according to claim 1, which is characterized in that: the adjustable-angle side plates are provided with positioning holes at intervals, the positioning holes are arranged in an arc shape, the positioning holes in the two adjustable-angle side plates correspond to each other, and the left end and the right end of the transverse plate are respectively connected with the positioning holes through pins or bolts so as to adjust the inclination angle of the ultrasonic hollow vibration device.
3. The small-aperture uniform powder feeding device for 3D printing ultrasound according to claim 1, which is characterized in that: but be provided with movable work platform on external frame's the base, every side of external frame linear guide has two, the slider is four, four the slider divide equally do not with but angle regulation curb plate is connected, but angle regulation curb plate is L type structure, its upper end side with the piston rod of pneumatic cylinder is connected.
4. The small-aperture uniform powder feeding device for 3D printing ultrasound according to claim 1, which is characterized in that: the ultrasonic hollow transducer comprises a piezoelectric ceramic piece, a copper electrode, a reflection end and a transmission end, and is connected by a hollow bolt to form a hollow inner channel.
5. The small-aperture uniform powder feeding device for 3D printing ultrasound according to claim 1, which is characterized in that: the ultrasonic hollow amplitude transformer comprises a primary amplitude transformer, a flange and a secondary amplitude transformer, a flange plate is arranged at the node of the amplitude transformer, and the flange plate is in clearance fit in a flange positioning groove on a fixed amplitude transformer frame and is pre-tightened through a countersunk head bolt; the uppermost end of the fixed amplitude transformer frame is provided with a threaded hole, the fixed amplitude transformer frame is fixedly connected to the transverse plate by adopting an internal hexagonal bolt, the large end of the primary amplitude transformer is provided with an internal threaded hole, and the ultrasonic hollow transducer and the ultrasonic hollow amplitude transformer are in threaded connection by utilizing a high-strength external hexagonal hollow bolt; and a powder outlet with a required small aperture is formed at the small end of the secondary amplitude transformer by laser processing.
6. The small-aperture uniform powder feeding device for 3D printing ultrasound according to claim 1, which is characterized in that: the material cavity adopts conical transition, so that the metal material can slide down conveniently; the ultrasonic power supply converts low-frequency current into high-frequency current, the whole device adopts a plurality of ultrasonic power supplies and is controlled by a PLC program, the power supply power can be changed or a single or a plurality of ultrasonic vibration devices can be respectively excited according to requirements, so that single-hole accurate powder feeding or multi-hole quantitative powder feeding is realized, the frequency of an output signal of the ultrasonic power supply is not less than 15kHz, and the voltage is 220V.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101392372A (en) * | 2008-10-10 | 2009-03-25 | 华中科技大学 | Pulse type dust feeder |
| CN203345765U (en) * | 2013-06-24 | 2013-12-18 | 温州大学 | Powder distributor conveying powder with centrifugal force |
| CN107840096A (en) * | 2017-08-04 | 2018-03-27 | 杭州电子科技大学 | The micro stable transport device of micro-nano stickiness powder and method |
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| US7458991B2 (en) * | 2002-02-08 | 2008-12-02 | Howmedica Osteonics Corp. | Porous metallic scaffold for tissue ingrowth |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101392372A (en) * | 2008-10-10 | 2009-03-25 | 华中科技大学 | Pulse type dust feeder |
| CN203345765U (en) * | 2013-06-24 | 2013-12-18 | 温州大学 | Powder distributor conveying powder with centrifugal force |
| CN107840096A (en) * | 2017-08-04 | 2018-03-27 | 杭州电子科技大学 | The micro stable transport device of micro-nano stickiness powder and method |
Non-Patent Citations (1)
| Title |
|---|
| 激光微区烧结微成形技术研究;陈继民 等;《电加工与模具》;20051220;第12-14页 * |
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