CN107570711A - A kind of pulse small hole gunite continuous high-efficient prepares the method and device of homogeneous spherical micro-particle - Google Patents
A kind of pulse small hole gunite continuous high-efficient prepares the method and device of homogeneous spherical micro-particle Download PDFInfo
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Abstract
The method and apparatus that a kind of pulse small hole gunite continuous high-efficient prepares homogeneous spherical micro-particle, it is characterized in that load metalliferous wire tray to be generated in the bin of left and right two first, it is passed through inert gas Ar, heating crucible makes metal liquid energy keep liquid, wire, which is transported out and is heated from ceramic mouth, is fusing into crucible, when reaching work liquid level, vent valve, which is opened, produces back pressure, inputting certain pulse signal to piezoelectric ceramics makes it produce certain longitudinal micro-displacement, and molten metal is acted on by driving rod, so that a certain amount of fine liquid sprays to form drop from the aperture of molten bath bottom, drop solidifies in descent forms homogeneous spherical metallic particles.According to droplet size and droping frequency adjustment wire feed rate, level balance in crucible is maintained, the bin of two dress metal wire feeding discs is used alternatingly.Present invention has the advantages that being capable of the production uniform particle size spheroidal particle of continuous high-efficient, particle good sphericity, size is controllable, substantially increases the efficiency of production.
Description
Technical field
It is more particularly to a kind of to be connected using pulse small hole gunite the invention belongs to the technical field of the preparation of spherical micro-particle
The continuous method and apparatus for efficiently preparing homogeneous spherical micro-particle.
Background technology
Direction with materials industry towards microminiaturization, lightness is developed, globular metallic powder in materials industry increasingly
Paid attention to, using 3D printing technique, the complex structural member for being much difficult to shaping can be printed as with globular metallic powder
Type.And particle size uniformity, surface quality and the sphericity of globular metallic powder all play vital work to properties of product
With.
With the extensive use of globular metallic powder, the technology of preparing for metal dust, which has been done, both at home and abroad largely grinds
Study carefully.At present, the technology of preparing of globular metallic powder is broadly divided into following several：1）Remelting process, this method are that metal is made carefully
Silk, segment then is cut into the method for machinery, metal segment then is immersed into remelting in deep fat forms globular metallic powder.Should
The shortcomings that method, is that production efficiency is extremely low, and for wire that moulding poor metal is difficult to be drawn into suitable diameter；
2）Atomization, this method are to form impact using high-speed Medium metal bath, so as to which broken metal bath forms tiny metal
Drop Condensation globulate metal dust.The shortcomings that this method, is that prepared metal dust particle diameter is uncontrollable, and powder table
Face is of poor quality, while easily forms satellite droplet；3）Uniform droplet spray, this method are using pulse signal control piezoelectric ceramics
Vibration, so as to drive the bar being connected with piezoelectric ceramics to vibrate, the metal bath in crucible is extruded away from small hole at bottom part, shape
Globulate molten drop is then condensed as globular metallic powder.The globular metallic powder uniform particle sizes of this method preparation, surface
Quality is good, sphericity is high, but at present this method exist one it is larger the shortcomings that, i.e., using crucible melting raw metal, work as crucible
In raw metal prepared after, it is necessary to shut down addition raw metal, process is cumbersome, it is impossible to realizes continuous production, significantly
Reduce production efficiency.
The content of the invention
It is an object of the invention to provide the dress that a kind of pulse small hole gunite continuous high-efficient prepares homogeneous spherical micro-particle
Put, the device employs automatic double wire feed systems and matched control system, solves low production efficiency, and production is discontinuous
The problems such as.Device charging is simple, and serialization and efficiently production are realized by alternately charging.And the automatization level of the device
Height, it only need to pass through alternately to reload achieving that continuous production.
The technical scheme is that a kind of pulse small hole gunite continuous high-efficient prepares the device of homogeneous spherical micro-particle, should
The two wire feed bins in left and right are arranged at the top of device, and door is housed in bin（1）, wire tray（2）, driving roller（11）, compress rolling
Wheel（10）, pressing device（9）, wire feed flexible pipe（12）, wire feed bin passes through ceramic mouth（15）With crucible（24）It is connected, ceramic mouth
Upper end is equipped with dynamic seal（13）；Crucible is located in vacuum cavity, and vacuum cavity includes door（30）, vacuum chamber, machinery
Pump（5）, diffusion pump（6）, vent valve（7）, air admission hole（4）；There is heater outside crucible（23）, upper end is stamped magnetic valve
（14）, heater is arranged at ceramic mouth bottom（16）, crucible inside is provided with thermocouple（17）, work liquid level sensor（22）, alarm
Liquid level sensor（21）, crucible bottom perforate and with narrow meshed potsherd（8）It is connected；Transmission system is by driving rod（20）And pressure
Electroceramics（18）Composition, piezoelectric ceramics are externally provided with water cooling plant（19）；It is collection portion below face potsherd, collection portion is by storehouse
Door（26）, supporter（28）, collecting tank（27）Composition, for collecting metallic；
The aperture of the potsherd of the bottom installation of described device perforate crucible, its pore diameter range is between 0.020~1.500mm；
Described device crucible is built-in with the thermocouple being connected with temperature regulating device, and the heater of crucible is connected with temperature regulating device；
The vibration frequency of the device piezoelectric ceramics is in 1~20KHZ；
The driving roller of described device uses driving stepper motor to realize automatic feeding.
A kind of method that pulse small hole gunite continuous high-efficient prepares homogeneous spherical micro-particle, its design are to load onto silk
Disk（2）, adjust roller（10）Wire is compressed, will be with foraminate potsherd（8）It is fixed on crucible with holes（24）Bottom, together
When adjust crucible in driving rod（20）Diameter and distance away from potsherd, utilize mechanical pump（5）Carry out being evacuated to low vacuum, with
Diffusion pump（6）It is evacuated to high vacuum, the magnetic valve of crucible end cap（14）Open while be passed through inert gas Ar gas and reach certain pressure
By force, ventilation is stopped, crucible begins to warm up and is heated to the temperature that metal can be maintained in liquid, passes through thermocouple（17）Prison in real time
Control, now ceramic mouth（15）The heater of lower section（16）Come into operation and wire feed is carried out when liquid level reaches work with faster speed
When making liquid level, vent valve（7）Opening makes the certain back pressure of generation, to piezoelectric ceramics（18）Inputting certain pulse signal makes its production
Raw certain longitudinal micro-displacement, and liquid metal is acted on by driving rod, so that a certain amount of fine liquid is from molten bath bottom
The aperture in portion sprays to form drop（25）, drop in descent without solidification form homogeneous spherical metallic particles.Now
Wire feed rate will also adjust according to the size and droping frequency of drop, to maintain the relative equilibrium of liquid level in crucible, work as liquid level
Stop wire feed during higher than alarm liquid level until dropping to work liquid level wire feed again to start, it is another when the wire of one side bin is finished
Individual bin immediately starts wire feed, and the bin being finished is changed the outfit, and AEI After End of Injection opens collection portion door and takes out particle.Its step
It is as follows：
（1）Charging, narrow meshed potsherd is fixed on the bottom of crucible, the metal wire tray that need to be produced is loaded onto in charging hopper, is used
Dynamic seal seals；
（2）Vacuum cavity is washed, crucible and vacuum chamber are vacuumized using mechanical pump and diffusion pump, and pour inert gas
Ar, it is repeated, finally makes to reach in vacuum cavity certain air pressure；
（3）Crucible temperature is maintained to be higher by prepared 30 ~ 50 DEG C of melting point metal using heater heating crucible, and thermocouple is supervised in real time
The temperature surveyed in molten bath, open wire feeder and start wire feed, melt wire using heater and be drop, control wire feed rate
For 50mm/min；
（4）Apply pressure difference, when liquid level reaches operating fluid level（The 50% of molten bath）, certain inert gas is released by vent valve,
Make to reach between crucible and vacuum chamber stable 0~50kPa of pressure difference using pressure difference control system；
（5）Applying vibration, the pulse signal editted, which is applied to piezoelectric ceramics, makes it produce certain longitudinal micro-displacement, and
Liquid metal is acted on by driving rod, so that a certain amount of fine liquid sprays to form drop from the aperture of molten bath bottom, liquid
The effect in descent due to gravity and surface tension is dropped in solidify to form homogeneous spherical metallic particles without container；
（6）Wire feed rate adjusts：Wire feed rate will be also adjusted with the size and frequency of the drop of whereabouts, to keep liquid level
Balance；
（7）The protection of device：When liquid level is higher than the alarm liquid level in molten bath（The 70% of molten bath）When stop wire feed, when it is down to work
Starting wire feed during liquid level；
（8）Change the outfit metal wire tray, and when the wire of one side bin is finished, another bin immediately starts wire feed, the bin being finished
Changed the outfit；
（9）Particle collection, injection are completed, and the bead of uniform particle diameter is taken out in collection portion.
The beneficial effects of the present invention are：1）It is used alternatingly using double wire feed systems, realizes continuous production, significantly carry
High powder preparation efficiency；2）The spherical powder preparation method and device provided, process controllability is strong, can control the temperature of crucible
Degree, it can control the pressure differential of crucible and vacuum cavity, controllable wire feed rate.
By methods and apparatus of the present invention, can high-efficiency and continuous largely produce the particle for meeting to require, and particle diameter is big
Small spherical metallic particles homogeneous, hot resume are consistent, sphericity is high.With production efficiency is high, labor intensity is low, production cost
Low, the characteristics of automatization level is high, it is appropriate for industrialized production.
Brief description of the drawings
Accompanying drawing 1 is the schematic device that pulse small hole gunite continuous high-efficient prepares homogeneous spherical micro-particle, in figure：1 storehouse
Door, 2 wire trays, 3 housings, 4 air admission holes, 5 mechanical pumps, 6 diffusion pumps, 7 vent valves, 8 potsherds, 9 pressing devices, 10 pinch rollers,
11 driving rollers, 12 wire feed flexible pipes, 13 dynamic seals, 14 magnetic valves, 15 ceramic mouths, 16 heaters, 17 thermocouples, 18 piezoelectricity
Ceramics, 19 water-cooling systems, 20 drive links, 21 liquid level sensors, 22 liquid level sensors, 23 heaters, 24 crucibles, 25 metals are small
Ball, 26 doors, 27 collecting tanks, 28 supporters, 29 doors, 30 doors.
Embodiment
With reference to specific embodiment and device sketch, the present invention is described in further detail.
Embodiment：It is 100 μm of alloys of nickel-base alloy Inconel 625 to prepare particle diameter, and concrete operation step is as follows：
（1）Charging, narrow meshed potsherd is fixed on the bottom of crucible, a diameter of 2mm nickel-base alloy is loaded onto in charging hopper
Inconel 625 metal wire tray, is sealed with dynamic seal；
（2）Vacuum cavity is washed, crucible and vacuum chamber are vacuumized using mechanical pump and diffusion pump, and pour inert gas
Ar, it is repeated, finally makes to reach in vacuum cavity certain air pressure；
（3）It is 1400 ~ 1420 DEG C to maintain crucible temperature using heater heating crucible, and thermocouple monitors the temperature in molten bath in real time
Degree, open wire feeder and start wire feed, it is drop to melt wire using heater, and it is 50mm/min to control wire feed rate；
（4）Apply pressure difference, when liquid level reaches operating fluid level（The 50% of molten bath）, certain inert gas is released by vent valve,
Make to reach between crucible and vacuum chamber stable 0~50kPa of pressure difference using pressure difference control system；
（5）Apply vibration, the pulse signal editted（Pulse frequency is 3000HZ）Being applied to piezoelectric ceramics makes it produce one
Fixed longitudinal micro-displacement, and liquid metal is acted on by driving rod, so that a certain amount of fine liquid is from molten bath bottom
Aperture sprays to form drop, drop in descent due to the effect of gravity and surface tension solidify without container to be formed it is homogeneous
Spherical metallic particles；
（6）Wire feed rate adjusts：Wire feed rate is finely adjusted in powder preparing processes, to keep the balance of liquid level；
（7）The protection of device：When liquid level is higher than the alarm liquid level in molten bath（The 70% of molten bath）When stop wire feed, when it is down to work
Starting wire feed during liquid level；
（8）Change the outfit metal wire tray, and when the wire of one side bin is finished, another bin immediately starts wire feed, cuts off wire
The UNICOM of bin and bin where crucible is finished, and carries out changing silk operation；
（9）Particle collection, particle take out the bead of uniform particle diameter in collection portion after the completion of preparing.
Claims (2)
1. a kind of pulse small hole gunite continuous high-efficient prepares the device of homogeneous spherical micro-particle, it is characterised in that：
（a）The two wire feed bins in left and right are arranged at the top of the device, and door is housed in bin（1）, wire tray（2）, driving roller
（11）, pinch rollers（10）, pressing device（9）, wire feed flexible pipe（12）, wire feed bin passes through ceramic mouth（15）With crucible（24）Phase
Even, the upper end of ceramic mouth is equipped with dynamic seal（13）；Crucible is located in vacuum cavity, and vacuum cavity includes door（30）, it is true
Plenum chamber, mechanical pump（5）, diffusion pump（6）, vent valve（7）, air admission hole（4）；There is heater outside crucible（23）, upper end
It is stamped magnetic valve（14）, heater is arranged at ceramic mouth bottom（16）, crucible inside is provided with thermocouple（17）, work liquid level sensor
（22）, alarm liquid level sensor（21）, crucible bottom perforate and with narrow meshed potsherd（8）It is connected；Transmission system is by being driven
Rod（20）And piezoelectric ceramics（18）Composition, piezoelectric ceramics are externally provided with water cooling plant（19）；It is collection portion below face potsherd,
Collection portion is by door（26）, supporter（28）, collecting tank（27）Composition, for collecting metallic；
（b）Described device perforate crucible bottom installation potsherd aperture, its pore diameter range 0.020~1.500mm it
Between；
（c）Described device crucible is built-in with the thermocouple being connected with temperature regulating device, and the heater of crucible is connected with temperature regulating device；
（d）The vibration frequency of the device piezoelectric ceramics is in 1~20KHZ；
（e）The driving roller of described device uses driving stepper motor to realize automatic feeding.
2. a kind of method that pulse small hole gunite continuous high-efficient prepares homogeneous spherical micro-particle, it is characterised in that：Using sensing
The wire that melting appartus continuously sends out wire feed system is melted, and molten metal is fallen under gravity into crucible with holes, is led to
Extra pulse voltage drives piezoelectric ceramic vibration, so that the bar being connected with piezoelectric ceramics pumps, by crucible
Molten metal extruded from the aperture of bottom, formed symmetrical liquid drop, in dropping process because surface tension effects formed it is spherical
Drop is simultaneously condensed into globular metallic powder, and its step is as follows：
（1）Charging, narrow meshed potsherd is fixed on the bottom of crucible, the metal wire tray that need to be produced is loaded onto in charging hopper, is used
Dynamic seal seals；
（2）Vacuum cavity is washed, crucible and vacuum chamber are vacuumized using mechanical pump and diffusion pump, and pour inert gas
Ar, it is repeated, finally makes to reach in vacuum cavity certain air pressure；
（3）Heating crucible, produced metal is set to maintain liquid using heater heating crucible, monitoring is molten in real time for thermocouple
Temperature in pond；
（4）Wire feed starts, and it is drop that the heater before ceramic mouth, which melts wire, with fast speed wire feed；
（5）Apply pressure difference, when liquid level reaches operating fluid level（The 50% of molten bath）, certain inert gas is released by vent valve,
Make to reach between crucible and vacuum chamber stable 0~50kPa of pressure difference using pressure difference control system；
（6）Applying vibration, the pulse signal editted, which is applied to piezoelectric ceramics, makes it produce certain longitudinal micro-displacement, and
Liquid metal is acted on by driving rod, so that a certain amount of fine liquid sprays to form drop from the aperture of molten bath bottom, liquid
The effect in descent due to gravity and surface tension is dropped in solidify to form homogeneous spherical metallic particles without container；
（7）Wire feed rate adjusts：Wire feed rate will be also adjusted with the size and frequency of the drop of whereabouts, to keep liquid level
Balance；
（8）The protection of device：When liquid level is higher than the alarm liquid level in molten bath（The 70% of molten bath）When stop wire feed, when it is down to work
Starting wire feed during liquid level；
（9）Change the outfit metal wire tray, and when the wire of one side bin is finished, another bin immediately starts wire feed, the bin being finished
Changed the outfit；
（10）Particle collection, injection are completed, and the bead of uniform particle diameter is taken out in collection portion.
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Cited By (5)
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| CN108214953A (en) * | 2018-01-19 | 2018-06-29 | 孟静 | High intensity fragile material processing method |
| CN113724993A (en) * | 2021-08-26 | 2021-11-30 | 中国科学院江西稀土研究院 | Method for preparing regenerative diffusion magnet by using permanent magnet waste containing Ce |
| CN114460125A (en) * | 2022-01-21 | 2022-05-10 | 西安航空学院 | Experimental device and method for metal surface supercooling liquid drop solidification |
| CN114706276A (en) * | 2022-02-25 | 2022-07-05 | 中国科学院大连化学物理研究所 | Liquid drop tin target supply device for EUV light source |
| CN116160007A (en) * | 2023-04-24 | 2023-05-26 | 成都佩克斯新材料有限公司 | Gold-tin powder preparation device and preparation method |
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Application publication date: 20180112 |