CN110421178A - A kind of device and method preparing high-quality spherical shape welding powder - Google Patents
A kind of device and method preparing high-quality spherical shape welding powder Download PDFInfo
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- CN110421178A CN110421178A CN201910850071.3A CN201910850071A CN110421178A CN 110421178 A CN110421178 A CN 110421178A CN 201910850071 A CN201910850071 A CN 201910850071A CN 110421178 A CN110421178 A CN 110421178A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/10—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying using centrifugal force
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
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Abstract
A kind of device and method preparing high-quality spherical shape welding powder, the equipment includes bucket-shaped atomization tank (1), the feeding device of atomization tank top side is set, it is set to the rotary ultrasonic atomising device (2) of atomization tank top center, it is set in atomization tank positioned at the cooling air flow table (8) of ultrasonic atomizing device lower part and the infrared radiation heater (21) below cooling air flow table and fluidisation sorting air-flow disk (20), the nebulization region cooling device and fluidisation sorting unit being set to outside atomization tank, it is set to the ultrasonic screening machine (24) or non-conservation tank (25) of atomization pot bottom.Nebulization efficiency of the present invention and control precision are high, easy to operate, and the spherical welding powder good sphericity that is prepared, the smooth zero defect of powder surface, crystalline structure meet the requirement of tin cream higher quality.
Description
Technical field
The present invention relates to welding powder production equipment and production method technical fields.
Background technique
Soldering tin material is the indispensable connecting material of electronics industry, take solder(ing) paste as the surface-assembled of main connecting material
The application of technology (STM), such that circuit assembly process is efficient, micromation, and SMT technology has become electronics assembly technology
Mainstream.Solder(ing) paste is mainly made of solder powder and weld-aiding cream, and wherein solder powder weight ratio accounts for 88-90% or so, solder powder
It is to prepare one of main material of solder(ing) paste.
The method for producing spherical welding powder at present has aerodynamic atomization, centrifugal atomizing and ultrasonic atomizatio, the weldering of gas atomization production
Powder sphericity difference satellite ball is more, and centrifugal atomizing glass putty surface texture sphericity not easy to control is general, and ultrasonic atomizatio glass putty is spherical
Preferably, but common ultrasonic atomization process equipment is using fixed angie type atomization for degree, and work area is smaller leads to mist for atomization vibration
Change metal flow is not high, and nebulization efficiency is lower.Since ultrasonic atomizing device design is in atomization cavity, individually designed sealing is needed
Ultrasonic transducer cooling-part, installation and maintenance are all complex.In addition nebulization region needs to control the cooling speed of alloy liquid droplet
Degree, common atomization plant are designed using atomization cavity collet water cooling, indirectly control nebulization region temperature, there is control
The problems such as precision is not high and unbalanced, and temperature gradient is larger.In addition, needing to control nebulization region during the nodularization of alloy liquid droplet
Hypoxic atmosphere, with adjust control drop surface tension realize powder it is spherical, be usually all first to vacuumize atomization cavity,
Nitrogen or other inert gases are poured, is supplemented air to realize the atomization atmosphere of hypoxemia, there are the gradient of oxygen concentration is larger
And non-uniform problem.In addition there is certain micro mist (< 5um) in atomized powder, is difficult to screen using common ultrasonic screening machine
It removes, it need to be using complicated air current classifying.
Summary of the invention
Present invention aim to address the above-mentioned problems of the prior art, a kind of nebulization efficiency and control precision are provided
Equipment and preparation method thereof high, easy to operate using disc type ultrasonic atomization process production high-quality spherical shape welding powder, with
The smooth zero defect of good sphericity, powder surface is prepared, crystalline structure meets the spherical welding powder that tin cream higher quality requires.
The purpose of the present invention is achieved through the following technical solutions:
Comprising bucket-shaped atomization tank, the confession of atomization tank top side is arranged in a kind of equipment preparing high-quality spherical shape welding powder
Material device, is set in atomization tank positioned at ultrasonic atomizing device the rotary ultrasonic atomising device for being set to atomization tank top center
The cooling air flow table of lower part and the infrared radiation heater below cooling air flow table and fluidisation sorting air-flow disk are set to mist
Change the nebulization region cooling device outside tank and fluidisation sorting unit, the ultrasonic screening machine or non-conservation tank that are set to atomization pot bottom；
The feeding device includes melt holding furnace and is set to melt heat preservation furnace bottom and is passed through the feed pipe of atomization tank,
The melt holding furnace is twin furnace bladder structure, including the melt gallbladder being disposed adjacent in furnace shell and bottom passes through the connection of infusion road
And heat-insulating internal container, melt gallbladder and the individual heating temperature-control system of each self-configuring of heat-insulating internal container, the feed pipe is configured with heating temperature control system
System；
The nebulization region cooling device includes gas thermostatic device, the oxygen conten analyser being installed on thermostat, connection
The oxygen cylinder and oxygen intake solenoid valve of gas thermostatic device, the nitrogen cylinder and nitrogen intake solenoid valve for connecting gas thermostatic device lead to
Cross nebulization region cooling air flow tube connection gas thermostatic device and cooling air flow table；
The fluidisation sorting unit includes the bagroom being connected to by micro mist pipe with atomization tank top, connect cloth bag receipts
The blowing mouth of the circulating fan of dirt device, circulating fan is connect with fluidisation sorting air-flow disk by fluidisation sorting gas flow tube；
In the atomization tank bottom end, discharge port sequence is equipped with outlet valve and dispenser, dispenser outlet and ultrasonic screening machine
Or the feed inlet connection of non-conservation tank.
Further, rotary ultrasonic atomising device of the present invention include shell, the ultrasonic transduction that is set in shell
Device, the fixed ring for being set in housing top end, the mounting rack being installed in fixed ring, the top cover for being installed on fixed ring top, installation
In on top cover conducting slip ring, be set to shell bottom end and be set on central axis timing belt pulley, be fixedly connected on synchronization
The mounting flange of belt pulley bottom；The central axis upper end of ultrasonic transducer is fixedly installed on mounting rack, lower end and synchronous belt
The central axis of wheel is fixedly connected, and the conducting slip ring is connect with ultrasonic transducer；The central axis lower end of timing belt pulley is fixed to be connected
Ultrasonic amplitude transformer is connect, ultrasonic amplitude transformer bottom end connects rotary ultrasonic atomizing disk, and the rotary ultrasonic atomizing disk is downward in dehiscing
It is tubaeform；Rotary ultrasonic atomising device is fixed at the top of atomization tank by mounting flange, driving motor is by being sleeved on synchronization
Synchronous belt on belt pulley drives the rotation of rotary ultrasonic atomising device；It is upper that the cooling air flow table is sleeved on ultrasonic amplitude transformer
Above ultrasonic atomizatio disk；Ultrasonic amplitude transformer is located in bucket-shaped atomization tank, and ultrasonic transducer and shell above section are positioned at bucket-shaped
Outside atomization tank.
Further, ventilation hole is offered on the shell of rotary ultrasonic atomising device.
Further, cooling air flow table of the present invention include the small circular disk body with annular cavity, it is radially distributed
It is set to the downward escape pipe of disk body bottom surface, downward escape pipe is communicated with annular cavity.
Further, fluidisation of the present invention sorting air-flow disk includes the small circular disk body with outer ring annular cavity, in putting
It penetrates shape to be uniformly arranged in the upward escape pipe of disk body outer ring top surface, upward escape pipe is communicated with outer ring annular cavity.
Further, the diameter of fluidisation sorting air-flow disk of the present invention is greater than cooling air-flow disk diameter.
Using the method for equipment of the present invention production high-quality spherical shape welding powder, the method is as follows:
A, by the melt gallbladder of configured alloy pig investment melt holding furnace, start melt gallbladder and heat-insulating internal container is heated and set
Respective heating temperature-control system is set, control temperature parameter is 50 DEG C~100 DEG C of aluminium alloy phase line or more, to alloy pig in melt gallbladder
Enter heat-insulating internal container along the infusion road of bottom after interior fusing；With the decline of alloy melting liquid level, liquid level in heat-insulating internal container in melt gallbladder
It increases, constantly adds virgin material into melt gallbladder, alloy liquid level is made to reach technique requirement；
B, it opens infrared radiation heater to preheat ultrasonic rotary ultrasonic atomizing disk, it is ensured that alloy molten solution atomization is initial
Mobility on atomizing disk opens feeder pipe and is simultaneously arranged its heating temperature-control system, control temperature parameter be aluminium alloy phase line with
Upper 50 DEG C~100 DEG C, while starting the ultrasonic vibration power supply of driving motor and rotary ultrasonic atomising device, rotary ultrasonic atomization dress
It sets and starts to rotate, alloy molten solution starts to be atomized along feeder pipe outlet injection to rotary ultrasonic atomizing disk in heat-insulating internal container, and alloy is molten
Liquid is first injected in the static segment of rotary ultrasonic atomizing disk, under the action of the centrifugal force of rotation and melt gravity, alloy molten solution
It is twist flowed in atomizing disk disk and quickly sprawls to form uniform thin liquid film in static segment, subsequently into rotary ultrasonic
In the vibration section of atomizing disk, tiny atomized alloy drop is formed under the high frequency ultrasound of rotary ultrasonic atomising device；
C, while alloy molten solution starts atomization, start nebulization region cooling device, set oxygen conten analyser range of atomization
The Control for Oxygen Content value in domain, by oxygen conten analyser according to set value calculation oxygen intake solenoid valve and nitrogen intake solenoid valve,
Oxygen is mixed in proportion with nitrogen；The controlling value of gas thermostatic device is concurrently set, control mixes gas in gas thermostatic device
Portion reaches the temperature of technique requirement, mixes gas through nebulization region cooling air flow tube and enters nebulization region cooling air flow table, passes through
Downward escape pipe directly acts on the alloy liquid droplet being just atomized, and realizes and carries out cooling velocity and ball to the alloy liquid droplet of ultrasonic atomizatio
The accurate control for changing speed, obtains spherical welding powder；
D, while alloy molten solution starts atomization, starting fluidisation sorting unit, circulating fan air-supply sorts air-flow through fluidisation
Pipe enters fluidisation sorting air-flow disk, provides sorting air-flow upwards by upward escape pipe, micro mist is sorted out, the gas containing micro mist
Gu mixed phase enters bagroom through micro mist pipe, after filtering return air to circulating fan；
E, while alloy molten solution starts atomization, start outlet valve and dispenser, spherical welding powder fall into ultrasonic sifted
Divide or is directly entered in non-conservation tank.
The present invention has at least the following advantages:
1, the melt holding furnace and feed pipe of the invention by feeding device is fed to atomization cavity, melt holding furnace
Dual-furnace-chamber bottom feeding structure, it can be ensured that alloy molten solution temperature during feeding melt in heat-insulating internal container is uniform and pure；
2, solder alloy melt is atomized by the drop in normal distribution partial size using disc type ultrasonic atomizatio, dehisce to
Under tubaeform rotary ultrasonic atomizing disk the atomization face of existing atomization plant is expanded to disk by a lesser conical surface region,
Atomisation area can not only be increased, improve atomized alloy liquid inventory, also first can quickly sprawl to form uniform thin liquid in disk
Then film forms tiny atomized alloy drop under high frequency ultrasound, improve nebulization efficiency and atomizing effect, be conducive to subsequent shape
At high-quality spherical shape welding powder；
3, the infrared radiation heater of setting preheating rotary ultrasonic atomizing disk can control alloy molten solution in atomization disk
The degree of superheat, guarantee its mobility and surface tension, strengthen ultrasonic atomizatio efficiency；
4, rotary ultrasonic atomising device uses external, and only ultrasonic amplitude transformer is set in atomization tank, ultrasonic transducer
And shell above section is respectively positioned on outside atomization tank, opens up ventilation hole on the shell of rotary ultrasonic atomising device in addition, so that
Energy converter can cool down immediately when ultrasonic atomizing device works, and can remove the complicated cooling system of setting from.Solves the prior art
Ultrasonic atomizatio energy converter is arranged in atomization tank, complicated cooling seal system is needed, structure is complicated, operation and maintenance cost
High problem；
5, the mixing gas of oxygen concentration and temperature-controllable is directly acted on to the conjunction of atomization by nebulization region cooling device
Golden drop realizes the accurate control for carrying out cooling velocity and nodularization speed to the alloy liquid droplet of ultrasonic atomizatio, obtains high-quality table
The solder alloy powder of face crystalline structure and sphericity；
6, it is directly sorted in atomization process according to the differential settling velocity of different-grain diameter powder by fluidizing sorting unit
Micro mist is removed, realizes the integral process of ultrasonic atomizatio and micro mist sorting；
7, it can be sieved again according to the welding powder quality requirements of the different trade mark specifications of production using directly screening or after transporting
Mode produces high-quality spherical shape welding powder product.
Present device is simple and reliable for structure, easily operated control.The spherical welding powder good sphericity of preparation, powder surface light
Sliding zero defect, crystalline structure meets tin cream requirement, best in quality.
Detailed description of the invention
Fig. 1 is high-quality spherical shape welding powder equipment schematic diagram of the present invention；
Fig. 2 is rotary ultrasonic atomising device schematic diagram；
Fig. 3 is Vltrasonic device shell schematic diagram；
Fig. 4-1 and Fig. 4-2 is the cross-sectional view and bottom view of nebulization region cooling air flow table radially；
Fig. 5-1 and Fig. 5-2 is the cross-sectional view and top view of fluidisation sorting air-flow disk radially.
Specific embodiment
As shown in Figure 1, a kind of equipment for preparing high-quality spherical shape welding powder, comprising bucket-shaped atomization tank 1, setting in atomization tank deck
The feeding device of portion side, the rotary ultrasonic atomising device 2 for being set to atomization tank top center are set in atomization tank positioned at super
The cooling air flow table 8 of sound atomising device lower part and the infrared radiation heater 21 below cooling air flow table and fluidisation sorting gas
Flow table 20, the nebulization region cooling device being set to outside atomization tank and fluidisation sorting unit, the ultrasound for being set to atomization pot bottom
Screening machine 24 or non-conservation tank 25.Infrared radiation heater 21 can be installed by welding mounting bracket in atomization tank, be fluidized
Sorting air-flow disk 20 can be sleeved in the mounting seat of infrared radiation heater.
The feeding device includes melt holding furnace 5 and is set to melt heat preservation furnace bottom and is passed through the feed pipe of atomization tank
7, the melt holding furnace is twin furnace bladder structure, including be disposed adjacent in furnace shell and bottom be connected to by infusion road 6 it is molten
Expect gallbladder 5-1 and heat-insulating internal container 5-2, melt gallbladder and the individual heating temperature-control system of each self-configuring of heat-insulating internal container, the feed pipe are configured with
Heating temperature-control system.
The nebulization region cooling device includes gas thermostatic device 9, the oxygen conten analyser 10 being installed on thermostat, leads to
Cross the oxygen cylinder 12 of the first branch pipe connection gas thermostatic device and be set on the first branch pipe oxygen intake solenoid valve 11, by the
The nitrogen cylinder 13 of two branch pipes connection gas thermostatic device and the nitrogen intake solenoid valve 14 being set on the second branch pipe, gas thermostatic device
9 are connect with cooling air flow table 8 by nebulization region cooling air flow tube 15.The gas thermostatic device is filled using the constant temperature of the prior art
It sets, it can be directly commercially available or according to the prior art oneself production.
The fluidisation sorting unit includes the bagroom 17 being connected to by micro mist pipe 16 with atomization tank top, passes through pipe
Road connects the circulating fan 18 of bagroom, and the blowing mouth and fluidisation sorting air-flow disk 20 of circulating fan pass through fluidisation sorting gas
Flow tube 19 connects.
In the atomization tank bottom end, discharge port sequence is equipped with outlet valve 22 and dispenser 23, dispenser outlet and supersonic sieve
The connection of the feed inlet of extension set 24 or non-conservation tank 25.The outlet valve 22 is butterfly valve, and dispenser 23 is star-shaped pocket feeder.
The rotary ultrasonic atomising device 2 includes that shell 2-3, the ultrasound being set in shell are changed as shown in Figure 2 and Figure 3
Energy device 2-2, the fixed ring 2-8 for being set in housing top end, the mounting rack 2-9 being installed in fixed ring, it is installed on fixed ring top
Top cover 2-10, the conducting slip ring 2-1 being installed on top cover, the synchronous belt that is set to shell bottom end and is set on central axis
Wheel 2-4, the mounting flange 2-5 for being fixedly connected on timing belt pulley bottom；The central axis upper end of ultrasonic transducer is fixedly installed in
On mounting rack 2-9, lower end is fixedly connected with the central axis of timing belt pulley, and the conducting slip ring 2-1 and ultrasonic transducer 2-2 connect
It connects；The central axis lower end of timing belt pulley is fixedly connected with ultrasonic amplitude transformer 2-6, and ultrasonic amplitude transformer bottom end connects rotary ultrasonic atomization
Disk 2-7, the rotary ultrasonic atomizing disk be in dehisce it is downward tubaeform；By mounting flange 2-5 by rotary ultrasonic atomising device
It is fixed at the top of atomization tank.2~4 ventilations are uniformly offered around cylindrical surface on the shell 2-3 of rotary ultrasonic atomising device 2
Hole 2-3-1.4 band of synchronous belt that the driving motor 3 passes through belt pulley and timing belt pulley 2-4 on connection motor output shaft
Dynamic rotary ultrasonic atomising device rotation；The cooling air flow table 8 is sleeved on ultrasonic amplitude transformer 2-6 and is located at ultrasonic atomizatio disk 2-
7 tops；Ultrasonic amplitude transformer is located in bucket-shaped atomization tank 1, and ultrasonic transducer 2-2 and shell 2-3 above section are located at bucket-shaped atomization
Outside tank.Driving motor uses frequency control, adjusts its revolving speed according to different trade mark specification products are produced.Rotary ultrasonic atomization dress
The structure for setting external design and ultrasonic transducer shell setting ventilation hole of the ultrasonic transducer outside atomization tank, so that super
Energy converter can cool down when sound atomising device rotates, and can remove complicated cooling system from.Existing skill can be used in the energy converter
The energy converter of art structure.It can be directly commercially available or according to the prior art oneself production.
The cooling air flow table 8 is as shown in Fig. 4-1 and Fig. 4-2, including the small circular disk body with annular cavity 8-1, in putting
It penetrates shape and is uniformly arranged downward escape pipe 8-2 in disk body bottom surface, downward escape pipe is communicated with annular cavity.The fluidisation sorts gas
Flow table 20 is as shown in Fig. 5-1 and Fig. 5-2, including the small circular disk body with outer ring annular cavity 20-1, radially distributed setting
Upward escape pipe 20-2 in disk body outer ring top surface, upward escape pipe are communicated with outer ring annular cavity.The fluidisation sorts air-flow
The diameter of disk 20 is greater than the diameter of cooling air flow table 8, can form the flow area blown upwards and be greater than the flow area blown downwards,
So that powder diameter is in normal distribution after the cooling nodularization of alloy liquid droplet, sorting micro mist is realized.
Using the method for equipment of the present invention production high-quality spherical shape welding powder, the method is as follows:
A, by the melt gallbladder 5-1 of configured alloy pig investment melt holding furnace 5, start melt gallbladder 5-1 and heat-insulating internal container
5-2 heats and is arranged respective heating temperature-control system, and control temperature parameter is 50 DEG C~100 DEG C of aluminium alloy phase line or more, wait close
Ingot melted in melt gallbladder after along bottom infusion road 6 enter heat-insulating internal container；With in melt gallbladder alloy melting liquid level decline,
Liquid level increases in heat-insulating internal container, constantly adds virgin material into melt gallbladder, alloy liquid level is made to reach technique requirement.Using melt gallbladder and heat preservation
Gallbladder heating temperature-control system independent can be such that alloy molten solution temperature in holding furnace stablizes, while the alloy molten solution in melt gallbladder
From bottom, material transfer pipe enters heat-insulating internal container, and the oxidizing slag that alloy pig generates when melting in melt gallbladder floats on alloy liquid level surface not
It can enter in heat-insulating internal container, it is ensured that into the degree of purity of ultrasonic atomization process alloy.
B, it opens 21 couples of ultrasound rotary ultrasonic atomizing disk 2-7 of infrared radiation heater to preheat, it is ensured that alloy molten solution mist
Change the mobility being initially on atomizing disk, open feeder pipe 7 and its heating temperature-control system is set, control temperature parameter is aluminium alloy
More than phase line 50 DEG C~100 DEG C, while starting the ultrasonic vibration power supply of driving motor 3 and rotary ultrasonic atomising device 2, rotation is super
Sound atomising device starts turning and works, and alloy molten solution is opened along feeder pipe outlet injection to rotary ultrasonic atomizing disk in heat-insulating internal container
Begin to be atomized.Rotary ultrasonic atomizing disk flare has multiple ultrasonic atomizatio wave bands above, is divided into node (static segment) and wave crest
(vibration section), alloy molten solution is first injected in static segment, and under the action of rotary centrifugal force and melt gravity, alloy molten solution is in disk
Helical flow trace accelerates metal liquid sprawling in static segment, promotes melt sprawling and thin liquid circumferentially
The formation of film makes have preferable uniformity and lower thickness of liquid film into the alloy molten solution for vibrating section, while use high frequency,
High-power pressure ultrasonic vibration power supply and ultrasonic transducer 2-2 obtain tiny atomized alloy drop, can greatly reduce subsequent shape
At alloyed powder granularity, greatly improve the productivity and flour extraction of alloy powder.Rotary ultrasonic atomising device uses rotating disk
Solder alloy melt is atomized into the drop in normal distribution partial size by formula ultrasonic atomization process, can be by the mist of traditional atomization plant
Change face is expanded to disk by a lesser conical surface region, increases atomisation area, atomized alloy liquid inventory can be improved therewith,
Improve nebulization efficiency.
C, while alloy molten solution starts atomization, start nebulization region cooling device, setting oxygen conten analyser 10 is atomized
The Control for Oxygen Content value in region is mounted on oxygen cylinder 12 and nitrogen cylinder 13 and gas according to set value calculation by oxygen conten analyser
Oxygen intake solenoid valve 11 and nitrogen intake solenoid valve 14 between thermostat 9 realize that oxygen mixes in proportion with nitrogen；Simultaneously
The controlling value of gas thermostatic device is set, control mixes the temperature that gas reaches technique requirement inside gas thermostatic device, mixes gas
Body enters the annular cavity 8-1 of nebulization region cooling air flow table 8 through nebulization region cooling air flow tube 15, passes through downward escape pipe 8-
2 directly act on the alloy liquid droplet being just atomized, and realize and carry out cooling velocity and nodularization speed to the alloy liquid droplet of ultrasonic atomizatio
Accurate control, obtains spherical welding powder.
D, while alloy molten solution starts atomization, starting fluidisation sorting unit, the air-supply of circulating fan 18 sorts gas through fluidisation
Flow tube 19 enters the outer ring annular cavity 20-1 of fluidisation sorting air-flow disk 20, provides sorting gas upwards by upward escape pipe 20-2
Stream, micro mist is sorted out, and the gas-solid mixing containing micro mist mutually enters bagroom 17 through micro mist pipe 16, after filtering return air
To circulating fan.Circulating fan, according to different different its revolving speed of adjustment of trade mark micro mist sinking speed are produced, is flowed using frequency control
It is below that change sorting unit directly sorts removal partial size 5um in atomization process according to the differential settling velocity of different-grain diameter powder
Micro mist realizes the integral process of ultrasonic atomizatio and micro mist sorting.In rotary ultrasonic atomization process, the cooling nodularization of alloy liquid droplet
Afterwards, powder diameter is in normal distribution, and it is big to control upward sorting air-flow wind speed since its sinking speed is different for different-grain diameter powder
In the sinking speed of the micro mist of < 5um, sorting micro mist can be realized.
E, while alloy molten solution starts atomization, start outlet valve 22 and dispenser 23, according to the different trade mark specifications of production
Welding powder quality requirements, spherical welding powder fall into the screening of ultrasonic screening machine 24 or enter it is subsequent again in non-conservation tank 25 sieved, obtain
To required high-quality spherical shape welding powder product.
Production instance 1: production Sn63Pb37 spherical shape welding powder.Sn63Pb37 alloy pig is fed intake, melt holding furnace and blanking
It 220 DEG C~230 DEG C of pipe temperature setting, opens infrared radiation heater and 200 DEG C of set temperature preheats atomizing disk, start
Ultrasonic vibration power supply and driving motor, ultrasonic atomizatio frequency are 51.2khz, set rotating electric machine revolving speed as 1100rpm, to
Sn63Pb37 alloy molten solution, which enters atomization cavity and sprays to rotary ultrasonic atomizing disk, to be started to be atomized, the cooling dress in starting nebulization region
It sets, sets oxygen conten analyser Control for Oxygen Content value as 120ppm, it is 60 DEG C that gas, which heats cooling thermostat controlling value, and atomization is opened
Begin while starting fluidisation sorting unit, sets circulating fan rotating speed as 500rpm, Sn63Pb37 power production is using interruption screening
Technique is dosed to ultrasonic screening machine after non-conservation tank being used to collect atomized powder again and is sieved, produced by the technique
Coarse rich Sn phase is presented in Sn63Pb37 powder average spherical degree > 0.95, the smooth no significant defect of powder surface, surface texture,
Oxygen content < 100ppm, micro- sem observation is without satellite ball.
Production instance 2 produces Sn96.5Ag3.0Cu0.5 spherical shape welding powder.Sn96.5Ag3.0Cu0.5 alloy pig is fed intake,
Melt holding furnace and 310 DEG C~320 DEG C of feeder pipe temperature setting, infrared radiation heater are arranged 300 DEG C of temperature, ultrasonic atomizatio frequency
Rate is 50.6khz, sets rotating electric machine revolving speed as 1200rpm, sets oxygen conten analyser Control for Oxygen Content value as 140ppm, gas
It is 30 DEG C that body, which heats cooling thermostat controlling value, sets circulating fan rotating speed as 410rpm, Sn96.5Ag3.0Cu0.5 powder is raw
It produces and uses direct sieving technology, is i.e. star-like feeder outlet is directly connected to ultrasonic screening machine, is produced by the technique
The defects of Sn96.5Ag3.0Cu0.5 powder average spherical degree > 0.95, powder surface smooth no cracking fold, surface crystallization tissue
Uniform and smooth, oxygen content < 100ppm, micro- sem observation is without satellite ball.
Production instance 3 produces Pb92.5Ag2.5Sn5.0 spherical shape welding powder.Pb92.5Ag2.5Sn5.0 alloy pig is fed intake,
Melt holding furnace and 380 DEG C~390 DEG C of feeder pipe temperature setting, infrared radiation heater are arranged 350 DEG C of temperature, ultrasonic atomizatio frequency
Rate is 49.6khz, sets rotating electric machine revolving speed as 1350rpm, sets oxygen conten analyser Control for Oxygen Content value as 110ppm, gas
It is 50 DEG C that body, which heats cooling thermostat controlling value, sets circulating fan rotating speed as 680rpm, Pb92.5Ag2.5Sn5.0 powder is raw
It produces using interruption sieving technology, that is, is dosed to ultrasonic screening machine again after using non-conservation tank to collect atomized powder and is sieved, by this
Pb92.5Ag2.5Sn5.0 powder average spherical degree>0.95 of technique production, the smooth no significant defect of powder surface, oxygen content<
100ppm, micro- sem observation is without satellite ball.
Claims (8)
1. a kind of equipment for preparing high-quality spherical shape welding powder, which is characterized in that including bucket-shaped atomization tank (1), be arranged in atomization tank
The feeding device of top side, is set to position in atomization tank at the rotary ultrasonic atomising device (2) for being set to atomization tank top center
In the cooling air flow table (8) of ultrasonic atomizing device lower part and the infrared radiation heater (21) below cooling air flow table and stream
Change sorting air-flow disk (20), the nebulization region cooling device being set to outside atomization tank and fluidizes sorting unit, is set to atomization tank
The ultrasonic screening machine (24) or non-conservation tank (25) of bottom；
The feeding device includes melt holding furnace (5) and is set to melt heat preservation furnace bottom and is passed through the feed pipe of atomization tank
(7), the melt holding furnace is twin furnace bladder structure, including is disposed adjacent in furnace shell and bottom passes through infusion road (6) connection
Melt gallbladder (5-1) and heat-insulating internal container (5-2), melt gallbladder and the individual heating temperature-control system of each self-configuring of heat-insulating internal container, the feeding
Pipe is configured with heating temperature-control system；
The nebulization region cooling device includes gas thermostatic device (9), the oxygen conten analyser (10) being installed on thermostat, connects
Connect the oxygen cylinder (12) and oxygen intake solenoid valve (11), the nitrogen cylinder (13) and nitrogen that connect gas thermostatic device of gas thermostatic device
Intake solenoid valve (14) connects gas thermostatic device and cooling air flow table (8) by nebulization region cooling air flow tube (15)；
The fluidisation sorting unit includes the bagroom (17) being connected to by micro mist pipe (16) with atomization tank top, connect cloth
The circulating fan (18) of bag collector, the blowing mouth of circulating fan and fluidisation sorting air-flow disk (20) pass through fluidisation sorting gas flow tube
(19) it connects；
In the atomization tank bottom end, discharge port sequence is equipped with outlet valve (22) and dispenser (23), dispenser outlet and supersonic sieve
The connection of the feed inlet of extension set (24) or non-conservation tank (25).
2. a kind of equipment for preparing high-quality spherical shape welding powder according to claim 1, which is characterized in that the rotary ultrasonic
Atomising device (2) includes shell (2-3), the ultrasonic transducer (2-2) being set in shell, the fixation for being set in housing top end
Ring (2-8), the top cover (2-10) for being installed on fixed ring top, is installed on top cover the mounting rack (2-9) being installed in fixed ring
Conducting slip ring (2-1), be set to shell bottom end and be set on central axis timing belt pulley (2-4), be fixedly connected on it is same
Walk the mounting flange (2-5) of belt pulley bottom；The central axis upper end of ultrasonic transducer is fixedly installed on mounting rack (2-9), under
End is fixedly connected with the central axis of timing belt pulley, and the conducting slip ring (2-1) connect with ultrasonic transducer (2-2)；Synchronous skin
The central axis lower end of belt wheel is fixedly connected ultrasonic amplitude transformer (2-6), and ultrasonic amplitude transformer bottom end connects rotary ultrasonic atomizing disk (2-
7), the rotary ultrasonic atomizing disk be in dehisce it is downward tubaeform；Rotary ultrasonic atomising device is consolidated by mounting flange (2-5)
It is scheduled at the top of atomization tank, driving motor (3) drives rotation super by the synchronous belt (4) being sleeved on timing belt pulley (2-4)
The rotation of sound atomising device；The cooling air flow table (8), which is sleeved on ultrasonic amplitude transformer (2-6), to be located on ultrasonic atomizatio disk (2-7)
Side；Ultrasonic amplitude transformer is located in bucket-shaped atomization tank (1), and ultrasonic transducer (2-2) and shell (2-3) above section are located at bucket-shaped mist
Change outside tank.
3. a kind of equipment for preparing high-quality spherical shape welding powder according to claim 2, which is characterized in that in rotary ultrasonic mist
Disguise and offers ventilation hole (2-3-1) on the shell (2-3) for setting (2).
4. a kind of equipment for preparing high-quality spherical shape welding powder according to claim 1 or 2 or 3, which is characterized in that described cold
But air-flow disk (8) include the small circular disk body with annular cavity (8-1), it is radially distributed be set to disk body bottom surface downwards go out
Tracheae (8-2), downward escape pipe are communicated with annular cavity.
5. a kind of equipment for preparing high-quality spherical shape welding powder according to claim 1 or 2 or 3, which is characterized in that the stream
Change sorting air-flow disk (20) to include the small circular disk body with outer ring annular cavity (20-1), radially distributed be set to outside disk body
The upward escape pipe (20-2) of top surface is enclosed, upward escape pipe is communicated with outer ring annular cavity.
6. a kind of equipment for preparing high-quality spherical shape welding powder according to claim 1 or 2 or 3, which is characterized in that the stream
The diameter for changing sorting air-flow disk (20) is greater than cooling air flow table (8) diameter.
7. a kind of equipment for preparing high-quality spherical shape welding powder according to claim 4, which is characterized in that the fluidisation sorting
The diameter of air-flow disk (20) is greater than cooling air flow table (8) diameter.
8. using the method for the equipment production high-quality spherical shape welding powder as described in any one of claim 1~7, which is characterized in that side
Method is as follows:
A, melt gallbladder (5-1) in the melt gallbladder (5-1) of configured alloy pig investment melt holding furnace (5), will be started and kept the temperature
Gallbladder (5-2) heats and is arranged respective heating temperature-control system, and control temperature parameter is 50 DEG C~100 DEG C of aluminium alloy phase line or more,
Enter heat-insulating internal container along the infusion road (6) of bottom after alloy pig melts in melt gallbladder；With alloy melting liquid in melt gallbladder
Liquid level increases in face decline, heat-insulating internal container, constantly adds virgin material into melt gallbladder, alloy liquid level is made to reach technique requirement；
B, it opens infrared radiation heater (21) to preheat ultrasonic rotary ultrasonic atomizing disk (2-7), it is ensured that alloy molten solution mist
Change the mobility being initially on atomizing disk, open feeder pipe (7) and its heating temperature-control system is set, control temperature parameter is alloy
More than liquidus curve 50 DEG C~100 DEG C, while starting the ultrasonic vibration power supply of driving motor (3) and rotary ultrasonic atomising device (2),
Rotary ultrasonic atomising device starts to rotate, and alloy molten solution is opened along feeder pipe outlet injection to rotary ultrasonic atomizing disk in heat-insulating internal container
Begin to be atomized, alloy molten solution is first injected in the static segment of rotary ultrasonic atomizing disk, in the centrifugal force of rotation and the work of melt gravity
Under, alloy molten solution twist flows in atomizing disk disk and quickly sprawls to form uniform thin liquid film in static segment, so
Enter in the vibration section of rotary ultrasonic atomizing disk afterwards, forms tiny atomization under the high frequency ultrasound of rotary ultrasonic atomising device and close
Golden drop；
C, while alloy molten solution starts atomization, start nebulization region cooling device, set oxygen conten analyser (10) range of atomization
The Control for Oxygen Content value in domain, by oxygen conten analyser according to set value calculation oxygen intake solenoid valve (11) and nitrogen air inlet electromagnetism
Valve (14) mixes oxygen with nitrogen in proportion；The controlling value of gas thermostatic device is concurrently set, control mixes gas in gas perseverance
Reach the temperature of technique requirement inside warm device, mixes gas through nebulization region cooling air flow tube (15) and enter nebulization region cooling air
Flow table (8) directly acts on the alloy liquid droplet being just atomized by downward escape pipe (8-2), realizes the aluminium alloy to ultrasonic atomizatio
Drop carries out the accurate control of cooling velocity and nodularization speed, obtains spherical welding powder；
D, while alloy molten solution starts atomization, starting fluidisation sorting unit, circulating fan (18) air-supply sorts air-flow through fluidisation
It manages (19) and enters fluidisation sorting air-flow disk (20), sorting air-flow is provided upwards by upward escape pipe (20-2), micro mist is sub-elected
Come, the gas-solid mixing containing micro mist mutually enters bagroom (17) through micro mist pipe (16), after filtering return air to circulating fan；
E, while alloy molten solution starts atomization, start outlet valve (22) and dispenser (23), spherical welding powder fall into ultrasonic screening
Machine (24) is sieved or is directly entered in non-conservation tank (25).
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| CN201910850071.3A CN110421178B (en) | 2019-09-10 | 2019-09-10 | Equipment and method for preparing high-quality spherical welding powder |
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| CN110666183A (en) * | 2019-11-19 | 2020-01-10 | 衡东县金源铝银粉有限公司 | Atomizing chamber for preparing firework aluminum powder |
| CN113059170A (en) * | 2021-03-18 | 2021-07-02 | 中国科学院力学研究所 | Rotary table device for preparing small-particle-size powder in metal centrifugal atomization |
| CN113070479A (en) * | 2021-03-18 | 2021-07-06 | 中国科学院力学研究所 | A carousel initial heating device for high temperature metal centrifugation atomizing powder process |
| CN113118448A (en) * | 2021-04-12 | 2021-07-16 | 杭州泛索能超声科技有限公司 | Novel rotatory supersound metal powder process equipment |
| CN113477930A (en) * | 2021-07-28 | 2021-10-08 | 合肥科晶材料技术有限公司 | Granulating method and equipment for high-temperature atomized metal alloy |
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Address after: 650501 No.2, Yunjing Road, information industry base, Kunming Economic and Technological Development Zone, Yunnan Province Patentee after: YUNNAN TIN NEW MATERIAL Co.,Ltd. Address before: 650501 No.2, Yunjing Road, information industry base, Kunming Economic and Technological Development Zone, Yunnan Province Patentee before: YUNNAN TIN MATERIAL Co.,Ltd. |
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