CN208825555U - Metal powder SLM forming process dynamic recycling repair system - Google Patents
Metal powder SLM forming process dynamic recycling repair system Download PDFInfo
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- CN208825555U CN208825555U CN201821573684.4U CN201821573684U CN208825555U CN 208825555 U CN208825555 U CN 208825555U CN 201821573684 U CN201821573684 U CN 201821573684U CN 208825555 U CN208825555 U CN 208825555U
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Abstract
The utility model provides a kind of metal powder SLM forming process dynamic recycling repair system, is made of SLM former, metal powder screening plant, metal powder prosthetic appliance, atmosphere protection and cooling drying equipment and computerized equipment；SLM former integrates laser system, forming platform system, powdering system, powder recovery system and atmosphere protection system by sealed compartment; powder recovery system connects metal powder screening plant; metal powder screening plant is connect by atmosphere protection and cooling drying equipment with metal powder prosthetic appliance; metal powder prosthetic appliance is connected to the powdering system of SLM former; computerized equipment is connected with the laser system of SLM former, powdering system and forming platform system, controls each system coordination work；This system improves the print quality of 3 D-printing, avoids pollution of the flue dust to former；Meanwhile supermatic formation system reduces drain on manpower and material resources, improves the printing effect of part, provides new thinking for quantization production SLM formation of parts.
Description
Technical field
The utility model belongs to three-dimensional objects rapid shaping technique field, is related to dynamic in metal powder SLM forming process
State recycling and reparation, specifically a kind of metal powder SLM forming process dynamic recycling repair system.
Background technique
Three-dimensional objects rapid shaping is that the three-dimensional structure model that will be designed in computer is separated into two-dimentional synusia, in two-dimensional layer
On piece is selectively formed by program along model, the method for eventually becoming true three-dimensional objects.Selective laser melting (SLM)
Forming is a kind of forming method of rapid shaping field with development potential, and SLM manufacturing process is the energy in laser beam focus
Under heating, the fusing of powder laying is layering through cooled and solidified and piles up forming, and the part compactness of manufacture can reach 100%,
Performance is even more than common casting.The advantage of SLM forming technique is that its increasingly automated, high-precision shapes, so as to reach
Design and control to the microstructure of material.Especially can be once-forming when producing complex component, partial structurtes are designed and are increased
Reinforcement degree, and secondary operation is avoided, shorten the production cycle.But due to the deficiencies in the prior art, SLM forming automation journey
Degree is confined in forming process, to guarantee the quality of powder, and a large amount of manpower is consumed in terms of the offer of powder and recycling
And material resources, because characteristic of metal powder such as sphericity, size distribution etc. has a great impact to SLM formation of parts.Design is high
The SLM powder of degree automation supplies recovery system, the performance of part can be improved, while saving powder cost.
It is not high to the powder using efficiency of recycling in the method that existing SLM Powder Recovery utilizes, it is made in removal process
It is deformed at metal powder, the powder of deformation can reduce the mobility of powder, have an impact to laying, to reduce SLM forming
The quality of part, it is serious or even cause spherodization serious, cause SLM processing to be interrupted, part rejection.Therefore, time of powder
Receipts problem limits the development of SLM powder circulation automation.If solving the metal powder during the utilization of SLM Powder Recovery
Problem on deformation, it will help the realization and development of SLM automation forming reduce the waste of metal powder, improve SLM morphoplasm
Amount.
Utility model content
The purpose of this utility model seeks to provide a kind of metal powder SLM forming process dynamic recycling repair system, energy
Metal powder deforms during enough solving the problems, such as the utilization of SLM Powder Recovery, reduces the waste of metal powder, improves SLM forming
Quality.
Used technical solution is the utility model to achieve the goals above:
A kind of metal powder SLM forming process dynamic recycling repair system, is set by SLM former, metal powder screening
Standby, metal powder prosthetic appliance, atmosphere protection and cooling drying equipment and computerized equipment are constituted；The SLM forming is set
Standby is that laser system, forming platform system, powdering system, powder recovery system and atmosphere protection system are passed through sealed compartment collection
At；The powder recovery system connects metal powder screening plant, and metal powder screening plant is dry by atmosphere protection and cooling
Dry equipment is connect with metal powder prosthetic appliance, and metal powder prosthetic appliance is connected to the powdering system of SLM former, institute
It states computerized equipment to be connected with the laser system of SLM former, powdering system and forming platform system, controls each system
Co-ordination.
The laser system uses 200W Nd-YAG short wavelength laser, controls card control X by RTC4, Y-axis galvanometer is swept
System is retouched, to control laser in the focal position of forming platform system, completes one layer of powdering fusing forming of forming platform,
Forming platform system lifting platform and the servo motor of powdering system are controlled by PLC controller, complete the powdering of forming platform, described
Servo motor uses Baldor VSSEWDM3541 motor；Powder recovery system is by collection powder cylinder, fan, vacuum pump and strainer structure
At；Atmosphere protection system provides device, booster, argon gas holding vessel and feeding tank composition, the row of being provided on feeding tank by argon gas
Port and pressure gauge.
The metal powder screening plant is made of screening storage tank, ultrasonic wave double precision screening plant and vacuum pump, storage
The feed inlet that batch can top is provided with the sealing cover of openable addition metal powder and connect with powder recovery system, lower part is set
It is equipped with the control valve that control powder enters screening plant inlet, setting ultrasonic vibration is sent out inside ultrasonic wave double precision screening plant
Generating apparatus and sieve powder net, are additionally provided with bulky grain discharge port, little particle discharge port, medium grain discharge port in equipment, each to discharge
It is additionally provided with gas vent on mouthful, medium grain Material collecting box for harvesting is connected on medium grain discharge port, medium grain Material collecting box for harvesting connection one is true
Sky pump.
The atmosphere protection and cooling drying equipment are made of argon gas feed equipment and the cooling drying equipment of liquid nitrogen, and argon gas supplies
Device, booster, argon gas holding vessel and feeding tank composition are provided by argon gas to equipment, is provided with exhaust outlet and pressure on feeding tank
Table, the cooling drying equipment of liquid nitrogen are made of drying box and condenser, and drying box is connected with condenser by circulating line, condenser
On be also connected with vacuum tube.
For the metal powder prosthetic appliance by reparation storage tank, plasma rotating electrode forming device and metal powder are cooling
And storage device composition, it repairs and is connected to powder feed inlet and atmosphere circulation and purification device, plasma rotating electrode on storage tank
Forming device is made of spray chamber, electrode assembly and plasmatorch generating device, is terminated under metal powder cooling and storage device
There is vacuum pump.
The workflow of metal powder SLM forming process dynamic recycling repair system is as follows:
The first step makes an addition to metal powder in the screening storage tank of metal powder screening plant, by the double essences of ultrasonic wave
The screening for spending screening plant is sieved as the metal powder granulates of three rank particle sizes, wherein the particle of bulky grain grade and
The particle of little particle grade is separately recovered, and the metal powder for the medium rank being sized out under the action of vacuum pump is conveyed
To atmosphere protection and drying equipment；
Second step is transported to the metal powder of atmosphere protection and drying equipment under the protection of argon gas, dry through supercooling
After dry, it is sent to the reparation storage tank of metal powder prosthetic appliance；
Third step is sent to the metal powder for repairing storage tank under the control of atomizer, the penetrating mist quantitatively pinpointed
At the electrode for changing the electrode device of room, the metal powder granulates before electrode are acted on by plasmatorch, metal powder granulates
The molten metal rotation package being melted, together forms good cause using rapid cooling by the metallic particles of this movement
The metal powder of density, sphericity and apparent density, the metal powder after plasma rotating electrode forming is repaired is in vacuum
Under pumping action, it is transported in the powdering system of SLM former；
4th step, powdering system carry out powdering by motor driven, in forming platform system, and laser is controlled by computer
Under laser scanning galvanometer complete to powdering layer melt shape, complete forming after, the formation cylinder of forming platform system is in computer
Under control, certain altitude is declined by motor driven, powdering system continues the powdering in upper one layer of shaping layer, later repeatedly laser
System shapes the fusing of powdering layer, finally obtains formation of parts；In part SLM forming process, a part of excess metal powder
End is pushed in the collection powder cylinder of powder recovery system by powdering system, under the collective effect of fan and vacuum pump, metal powder
It is inhaled into pulverized coal feed pipe, and due to the setting of strainer, metal powder will not be blown out from stomata, and ensure that form seal cabin
Interior stable gas pressure；After forming, rises formation cylinder, residual metallic powder is artificially collected to the collection of powder recovery system
In powder cylinder, the recycling of metal powder is completed；
5th step, the metal powder of recycling are transported to the screening of metal powder screening plant under the action of vacuum pump
In storage tank, screening, atmosphere protection, cooling drying, powder reparation are mixed and continued to complete with the metal powder being newly added, until
SLM next time, which shapes, to be used.
Further, in the first step, for different materials, the sieve in screening plant can be replaced, to approach plasma
Particle diameter distribution is repaired in rotation electrode forming, improves repairing quality.It, can not meanwhile if the metal powder good sphericity purchased
By the process of reparation, it is placed directly in the reparation storage tank of metal powder prosthetic appliance.
Further, in second step, the air pressure of argon atmosphere should be suitable for, relative to other equipment air pressures, in argon gas
It provides and the circulation that higher air pressure can guarantee argon gas is provided at device, argon gas provides the ar pressure that device provides and is
150kPa, plasma rotating electrode shape air pressure of the pressure control of prosthetic appliance spray chamber in 100kPa, SLM sealed compartment
Control is in 100kPa.
Further, in third step, the straying quatity of metal powder is 1.0-3.0 × 10−6 m3·s−1, plasma torch heats
Temperature and electrode rotary speed are depending on the material of metal powder.Plasma torch heats temperature need to reach the first of metal and melt temperature；
Electrode rotary speed need to be according to the physical property of metal material: the viscosity, mu (Pas) of liquid metal, melting rate Q(m3·s-1), density p (kgm-3), metallic particles rotational speed omega (rads-1), the surface tension γ (Nm of liquid metal-1), it is density.
r0(m) be swingle diameter, using experience centrifugal model statistic equation
Available Hinze-Milborn (Hi) constant.According to the size of Hi constant, three kinds of liquid metal rotation are selected
Experience centrifugal model: when Hi < 0.07, particle rotation mainly meets DDF(direct drop formation) model, using quasi-
The low viscosity metal liquid low speed rotation average grain diameter formula of conjunction calculates electrode rotary speed omega
；
If particle rotation model is LD (ligament disintegration) model when 0.07 < Hi < 1.33,
It is less than the metal of 20mPas for liquid viscosity, Hi is generally between 0.07 and 1.33, so grain is arranged according to LD model in selection
The reparation parameter of diameter distribution, calculates electrode rotary speed omega using the low viscosity metal liquid average grain diameter formula of fitting
；
If Hi > 1.33, particle rotation model is FD (film disintegration) model.It is set according to FD model
The reparation parameter for setting particle diameter distribution calculates electrode rotary speed using the high speed rotating metallic liquid average grain diameter formula of fitting
Spend ω
。
Wherein the sphericity of DDF model is more stable, and the sphericity of LD model and FD model is not sufficiently stable, it may appear that sheet
Change, low viscosity material should use lower revolving speed with the DDF model that is becoming tight, obtain more stable sphericity.
Further, in the 4th step, computer carries out discrete hierarchy slicing firstly the need of to three-dimensional CAD model, generates and swashs
Light path, computer are again handled process data, control laser and galvanometer control card, so that laser and galvanometer are controlled,
Realize SLM forming.Meanwhile computer and PLC controller realize data exchange, wherein PLC controller mainly controls forming lifting
Platform, powdering servo motor and powder feeding valve etc..It is final to realize that computer controls the entirety of SLM former.The gold of powdering system
Belonging to powder is provided by the powder supply cylinder on powdering system upper layer, since powder supply cylinder air pressure is very big, has been specifically designed exhaust apparatus, to protect
The safety of testimony powder cylinder.
The beneficial effects of the utility model are: the utility model provide it is a kind of increasingly automated and reusable plus
The SLM forming process dynamic recycling restorative procedure and system of remaining metal powder after work；Utility model is using the double essences of ultrasonic wave
Degree screening plant sieves metal powder, obtains the suitable metal powder of particle diameter distribution；It is dry using atmosphere protection and cooling
Dry equipment removes the vapor in atmosphere, while avoiding Powder Oxidation, improves the quality of reparation and SLM forming；Using plasma
Atomized metal pow der prosthetic appliance repairs the metal powder granulates of strain cracking, and it is good to obtain sphericity height, apparent density
Metal powder；Improved SLM former formed product is finally used, print quality is improved, avoids flue dust to equipment
Pollution.Meanwhile supermatic formation system reduces drain on manpower and material resources, improves the print quality of part, is
Quantization production SLM formation of parts provides new thinking.The utility model metal SLM shaped alloys are suitable for stainless steel, Ni-based
The metal powders such as alloy, cobalt-base alloys.
Detailed description of the invention
Fig. 1 is the operational flow diagram that the utility model metal powder SLM forming process dynamic recycles repair system.
Fig. 2 is metal powder screening plant in the utility model metal powder SLM forming process dynamic recycling repair system
Schematic diagram.
Fig. 3 is that atmosphere protection and cooling are dry in the utility model metal powder SLM forming process dynamic recycling repair system
The schematic diagram of dry equipment.
Fig. 4 is metal powder prosthetic appliance in the utility model metal powder SLM forming process dynamic recycling repair system
Schematic diagram.
Fig. 5 is the plasma rotating electrode forming repair process structural principle of metal powder prosthetic appliance in the utility model
Figure.
Fig. 6 is the structure that metal powder SLM forming process dynamic recycles repair system SLM former in the utility model
Schematic diagram.
1.1 in figure, SLM former；1.2, laser system；1.3, powdering system；1.4, forming platform system；1.5, powder
Last recovery system；1.6, atmosphere protection system；1.7, computerized equipment；1.8, metal powder screening plant；1.9, atmosphere
Protection and cooling drying equipment；1.10, metal powder prosthetic appliance；
2.1, storage tank is sieved；2.2, control valve；2.3, ultrasonic wave double precision screening plant；2.4, bulky grain discharge port；
2.5, little particle discharge port；2.6, medium grain discharge port；2.7, medium grain Material collecting box for harvesting；2.8, vacuum pump；2.9, gas vent；
2.10, gas vent；2.11, gas vent；2.12, sealing cover；2.13, feed inlet；2.14, powder net is sieved；2.15, ultrasonic vibration occurs
Device；
3.1, vacuum tube；3.2, condenser；3.3, drying box；3.4, condenser；3.5, argon gas provides device；3.6, it is pressurized
Device；3.7, argon gas holding vessel；3.8, feeding tank；3.9, exhaust outlet；3.10, pressure gauge；
4.1, powder inlet；4.2, storage tank is repaired；4.3, plasma rotating electrode forming device；4.4, plasma revolves
Turn electrode forming powder storage tank provided；4.5, vacuum pump；4.6, atmosphere circulation and purification device；4.7, spray chamber；4.8, electrode fills
It sets；4.9, plasmatorch generating device；
5.1, atomizer；5.2, electrode bar；5.3, mandrel；5.4, Cu anode；5.5, W cathode；5.6, molten drop；
5.7, surface of metal particles fluid line；
6.1, Nd-YAG generating device of laser；6.2, atmosphere purification entrance；6.3, for powder pipeline；6.4, powdering system；
6.5, exhaust apparatus；6.6, formation cylinder；6.7, filter screen；6.8, exhaust apparatus；6.9, Powder Recovery pipeline；6.10, gas vent；
6.11, blowing mouth；6.12, powdering system sliding rail；6.13, smoke dust filter；6.14, argon gas provides device；6.15, gas
Press measure and control device；6.16, the filter mouth being connected with the external world；6.17, atmosphere purification delivery port.
Specific embodiment
The utility model is described further with reference to the accompanying drawings and embodiments:
A kind of metal powder SLM forming process dynamic recycling repair system, as shown in Figure 1, by SLM former 1.1, gold
Belong to powder sieving equipment 1.8, atmosphere protection and cooling drying equipment 1.9, metal powder prosthetic appliance 1.10 and computer control
Equipment 1.7 is constituted.
Wherein SLM former 1.1 is to return laser system 1.2, powdering system 1.3, forming platform system 1.4, powder
What receipts system 1.5 and atmosphere protection system 1.6 were integrated by sealed compartment；Laser system 1.2 uses 200W Nd-YAG short wavelength
Laser controls card control X, Y-axis galvanometer scanning system by RTC4, to control laser in forming platform system 1.4
Focal position completes one layer of powdering fusing forming of forming platform, the formation cylinder and powdering system 1.3 of forming platform system 1.4
By Serve Motor Control in forming platform powdering, the servo motor uses Baldor VSSEWDM3541 motor；Powder Recovery
System 1.5 is made of collection powder cylinder, fan, vacuum pump and strainer；Atmosphere protection system 1.6 provides device, booster, argon by argon gas
Gas holding vessel and feeding tank form, and are provided with exhaust outlet and pressure gauge on feeding tank.
Metal powder screening plant 1.8 is as shown in Fig. 2, by screening storage tank 2.1, ultrasonic wave double precision screening plant 2.3
And vacuum pump 2.8 is constituted, screening 2.1 top of storage tank is provided with the sealing cover 2.12 and and powder of openable addition metal powder
The feed inlet 2.13 that last recovery system 1.5 connects, lower part are provided with the control valve that control powder enters screening plant inlet
2.2, setting ultrasonic vibration generating device 2.15 and sieve powder net 2.14 inside ultrasonic wave double precision screening plant 2.3, in equipment also
It is provided with bulky grain discharge port 2.4, little particle discharge port 2.5, medium grain discharge port 2.6, the row of being additionally provided on each discharge port
Stomata 2.9,2.10 and 2.11 connects medium grain Material collecting box for harvesting 2.7, medium grain Material collecting box for harvesting 2.7 on medium grain discharge port 2.6
Connect a vacuum pump 2.8.
Atmosphere protection and cooling drying equipment, as shown in figure 3, by argon gas feed equipment and the cooling drying equipment structure of liquid nitrogen
At argon gas feed equipment provides device 3.5, booster 3.6 by argon gas, and argon gas holding vessel 3.7 and feeding tank 3.8 form, gas supply
Exhaust outlet 3.9 and pressure gauge 3.10 are provided on case 3.8, the cooling drying equipment of liquid nitrogen is by 3.2 He of drying box 3.3 and condenser
3.4 are constituted, and drying box 3.3 is connected with 3.4 by circulating line with condenser 3.2, are also connected on condenser 3.2 and 3.4 true
Blank pipe 3.1.
Metal powder prosthetic appliance is as shown in figure 4, by reparation storage tank 4.2,4.3 He of plasma rotating electrode forming device
Plasma rotating electrode formed powder storage tank 4.4 forms, and is connected to powder feed inlet 4.1 on reparation storage tank 4.2 and atmosphere is followed
Ring and purification device 4.6, plasma rotating electrode forming device 4.3 are sent out by spray chamber 4.7, electrode assembly 4.8 and plasmatorch
Generating apparatus 4.9 is constituted, and is terminated with vacuum pump 4.5 under plasma rotating electrode formed powder storage tank 4.4.
The workflow of metal powder SLM forming process dynamic recycling repair system is as follows:
The first step makes an addition to metal powder in the screening storage tank of metal powder screening plant, by the double essences of ultrasonic wave
The screening for spending screening plant is sieved as the metal powder granulates of three rank particle sizes, wherein the particle of bulky grain grade and
The particle of little particle grade is separately recovered, and the metal powder for the medium rank being sized out under the action of vacuum pump is conveyed
To atmosphere protection and drying equipment；For different materials, the sieve in screening plant can be replaced, is sized partial size point to reach
The requirement of cloth, while if the metal powder purchased is had excellent performance, metal powder can be placed directly in without the process of reparation
In the reparation storage tank of last prosthetic appliance；
Second step is transported to the metal powder of atmosphere protection and drying equipment under the protection of argon gas, dry through supercooling
After dry, it is sent to the reparation storage tank of metal powder prosthetic appliance；The air pressure of argon atmosphere should be suitable for setting relative to other
Standby air pressure, the circulation for providing higher air pressure at device and can guaranteeing argon gas is provided in argon gas, and argon gas provides the argon that device provides
Gas air pressure is 150KPa, and plasma rotating electrode shapes the pressure control of prosthetic appliance spray chamber in 100kPa, SLM sealed compartment
Interior pressure control is in 100kPa；
Third step is sent to the metal powder for repairing storage tank under the control of atomizer, and quantitative fixed point ground sprays into mist
At the electrode for changing the electrode device of room, the penetrating rate of metal powder is 1.0-3.0 × 10−6 m3· s−1, before electrode
Metal powder granulates are acted on by plasmatorch, and the molten metal that metal powder granulates are melted rotates package, electrode rotary speed
With plasma torch heats temperature depending on material it is first melt temperature depending on；By the metallic particles of rotary motion, using rapid cooling,
Consistency, sphericity and the good metal powder of apparent density are together formed, after plasma rotating electrode forming is repaired
Metal powder under vacuum pumping action, be transported in the powdering system of SLM former；
4th step, powdering system carry out powdering by motor driven, in forming platform system, and laser is controlled by computer
Under laser scanning galvanometer complete to powdering layer melt shape, complete forming after, the formation cylinder of forming platform system is in computer
Under control, certain altitude is declined by motor driven, powdering system continues the powdering in upper one layer of shaping layer, later repeatedly laser
System shapes the fusing of powdering layer, finally obtains formation of parts；In part SLM forming process, a part of excess metal powder
End is pushed in the collection powder cylinder of powder recovery system by powdering system, under the collective effect of fan and vacuum pump, metal powder
It is inhaled into pulverized coal feed pipe, and due to the setting of strainer, metal powder will not be blown out from stomata, and ensure that form seal cabin
Interior stable gas pressure；After forming, rises formation cylinder, residual metallic powder is artificially collected to the collection of powder recovery system
In powder cylinder, the recycling of metal powder is completed；
5th step, the metal powder of recycling are transported to the screening of metal powder screening plant under the action of vacuum pump
In storage tank, screening, atmosphere protection, cooling drying, powder reparation are mixed and continued to complete with the metal powder being newly added, until
SLM next time, which shapes, to be used.
Metal powder material suitable for SLM forming has very much, wherein high temperature of the nickel base superalloy at 650 ~ 1000 DEG C
Under intensity with higher and good anti-oxidant, resistance to combustion gas corrosion, there is high-intensitive, excellent anti-fatigue performance and creep spy
Property, it is high-temperature alloy material important in aerospace field.IN718 is a kind of precipitation strength type nickel rich in Cr and Fe element
Based alloy, made powder are able to satisfy the manufacture requirement of selective laser melting process, and dusty material has good wetting
Property and it is autolyzed, be easy to SLM forming.In addition, the preferable SLM forming partial size degree of IN718 size of powder particles is distributed in 25-30 μm, paving
Thickness degree can get preferable SLM formation of parts at 40-50 μm, and excellent power can be obtained in the case where being dissolved precipitation enhancement
Learn performance and service life.
Metal powder material of the IN718 as the utility model embodiment is selected, processing flow is as shown in Figure 1, metal
Powder transmission process is as shown in solid arrow path, and the control planning of computerized equipment 1.7 is as shown in dotted arrow.SLM
Former is by laser system 1.2, paving subsystem 1.3, forming platform system 1.4, powder recovery system 1.5, atmosphere protection
The collection of system 1.6 is constituted together in the sealed compartment of SLM former 1.1, and each system is each under the auxiliary of computerized equipment 1.7
A system coordination work, completes the processing of SLM formation of parts.Remaining metal powder is recycled to powder sieving system after forming
1.8 are sieved, then the pretreatment before powder repair system 1.10 is completed via atmosphere protection and cooling drying system 1.9, to
SLM forming next time uses
Metal powder makes an addition in the screening storage tank 2.1 as shown in Figure 2 of metal powder screening plant 1.8, by ultrasound
The screening of wave screening plant 2.2, the mesh number of upper and lower level sieve 2.14 are respectively 400 mesh and 600 mesh, are sieved as three rank partial sizes
The metal powder granulates of size, wherein bulky grain (>38 μm) and little particle (<23 μm) are respectively via 2.4 He of bulky grain discharge port
Little particle discharge port 2.5 recycles.Under the action of vacuum pump 2.8, (23-38 μm) of metallic particles warp of the medium rank sifted out
By medium grain discharge port 2.6, it is transported at atmosphere protection and cooling drying equipment 1.9, as shown in figure 3, to guarantee screening
The safety of equipment, prevents in metal powder screening plant that air pressure is excessively high to explode, and is added to exhaust dress in each discharge outlet
Set 2.9,2.10,2.11.If forming requirements are all not achieved in the metal powder particle distribution and sphericity of addition, can directly beat
It opens sealing cover 2.12 and is stored in storage tank 2.1 jointly with the metal powder recycled from powder recovery system 1.5.If addition
Metal powder is had excellent performance, good sphericity, can without repair process, be placed directly in metal powder prosthetic appliance 1.10 etc.
In ion rotation electrode formed powder storage tank 4.4.
Atmosphere protection and cooling drying equipment, as shown in figure 3, by argon gas feed equipment and the cooling drying equipment structure of liquid nitrogen
At atmosphere protection is to carry out atmosphere protection by providing argon gas into closed metal powder transfer pipeline, passes through booster 3.6
Argon gas holding vessel 3.7 is pressurized, while via the air in 2.9 discharge line of exhaust valve, to guarantee the stabilization of system pressure
Property, metal powder is under the protection of argon atmosphere.Relative to other equipment air pressure, provides in argon gas and provided at device 3.5
Higher air pressure (150kPa) can guarantee the circulation of argon gas.Metal powder after cooling and drying device, avoids vapor again
The influence that reparation and SLM forming are shaped to plasma rotating electrode, after metal powder enters drying box 3.3, due to condenser
3.2,3.4 low pressure for generating vacuum tube 3.1 under the action of vacuum pump, the atmosphere in pipeline are inhaled into condenser, due to
Condenser temperature is very low (- 40 DEG C), and vapor cooling is sublimated in condenser, and argon gas is returned in pipeline by circulation pipe.
Metal powder after drying is under the action of vacuum pump, as shown in figure 4, being transported to gold through powder feed inlet 4.1
In the reparation storage tank 4.2 for belonging to powder prosthetic appliance 1.10, plasma atomization prosthetic device 4.3 is filled by spray chamber 4.7, electrode
Set 4.8, plasmatorch generating device 4.9 composition.Metal powder quantifies as shown in figure 5, under the control of atomizer 5.1
Fixed point ground sprays into spray chamber 4.7, and (penetrating rate is 1.0-3.0 × 10−6 m3· s−1) rotation electrode bar 5.2 at, rotation electrode
The molten metal rotation package that preceding metal powder granulates are melted by particle under the action of plasmatorch, by this movement
Metallic particles forms the metal powder of good consistency, sphericity and apparent density, is stored in using rapid cooling
In ion rotation electrode formed powder storage tank 4.4, it is delivered in SLM former when required by vacuum pump 4.5.Due to
IN718 molten metal viscosity is less than 20mPas, so selection is according to LD (ligament disintegration) model (feature
It is to rotate and causes discrete molten drop 5.6 and surface of metal particles fluid line 5.7) the reparation parameter of particle diameter distribution is set,
Electrode rotary speed omega is calculated using low viscosity metal liquid average grain diameter calculation formula
Wherein ρ is density (8.21gm-3=82.1kg·m-3), d is average grain diameter (3.05 × 10-5M), δ is liquid gold
Surface tension (the 1.82Nm of category-1), r0It for the diameter (0.08m) of rotation electrode stick, is computed, ω electrode rotary speed reason
By upper for (2416.2rads-1≈ 23073.7rpm).And be actually that excessively high rotation speed is avoided to cause sphericity poor, it answers
This makes reparation particle be becoming tight in spherical shape using revolving speed more lower than theoretical value.Therefore the electrode of rotation is driven by mandrel 5.3
Revolving speed should be set as 20000rpm.Meanwhile the fusion temperature of IN718 is 1260-1320 DEG C, plasmatorch device passes through Cu material
The anode 5.4 of material and the cathode 5.5 of W material generate electric arc and are filling to generate the fusion temperature that high-temperature gas reaches IN718
It is passed through under argon gas and works in setting, ensure that the atmosphere of spray chamber 4.7, and air-flow is generated by atmosphere circulation and purification device 4.6,
Reduce pollution of the metal droplet to metal powder.
Metal powder is transported to SLM forming under the action of vacuum pump and sets after plasma rotating electrode forming is repaired
In standby, as shown in fig. 6, compared since metal powder is provided by the powder supply cylinder on powdering system upper layer than common powdering equipment,
Apparent density is lower, therefore it is 60 μm that overlay thickness need to be arranged according to the above reason.Pass through sliding rail under motor driven
6.12 complete powdering in forming platform, and the laser scanning galvanometer completion under laser is controlled via computer is fused into powdering layer
Shape.After completing forming, the formation cylinder 6.6 of forming platform declines certain altitude under the coordination of control system, through motor driven,
Powder supply power spreading device continues the powdering in upper one layer of shaping layer, and repeatedly laser 6.1 shapes the fusing of powdering layer later, finally
Obtain formation of parts.In SLM forming process, some excess metal powder is pushed in collection powder cylinder by power spreading device, in wind
Under the collective effect of fan and vacuum pump, metal powder is inhaled into pulverized coal feed pipe 6.9, and due to the effect of strainer 6.7, metal powder is not
It can be blown out from stomata 6.10, while ensure that the stable gas pressure in SLM form seal cabin.Simultaneously in SLM forming process,
A large amount of flue dust is had to generate, above the sealed compartment for flue dust being blowed to via the gas hole 6.11 of design atmosphere protection system,
Atmosphere protection system (including smoke dust filter 6.13, argon gas provide device 6.14, air pressure measure and control device 6.15, with the external world phase
Even filter mouth 6.16, atmosphere purification delivery outlet 6.17, atmosphere purification delivery outlet 6.2) effect under, ensure that sealing below deck equipment not
It is damaged unaffected with SLM forming process.
After forming, rise formation cylinder, residual metallic powder is manually sucked or is swept into collection powder cylinder, complete metal
The recycling of powder.The metal powder of recycling is transported in the storage tank of screening plant by vacuum pump, mixed with the metal powder of addition
Conjunction continues to complete screening, atmosphere protection, cooling drying, powder reparation, shapes and uses to SLM next time.
Claims (5)
1. a kind of metal powder SLM forming process dynamic recycling repair system, it is characterised in that: by SLM former, metal powder
Last screening plant, metal powder prosthetic appliance, atmosphere protection and cooling drying equipment and computerized equipment are constituted；It is described
SLM former is to lead to laser system, forming platform system, powdering system, powder recovery system and atmosphere protection system
It is integrated to cross sealed compartment；The powder recovery system connects metal powder screening plant, and metal powder screening plant is protected by atmosphere
Shield and cooling drying equipment are connect with metal powder prosthetic appliance, and metal powder prosthetic appliance is connected to SLM former
Powdering system, the laser system, powdering system and forming platform system phase of the computerized equipment and SLM former
Even, each system coordination work is controlled.
2. a kind of metal powder SLM forming process dynamic recycling repair system according to claim 1, it is characterised in that:
The laser system of the SLM former uses 200W Nd-YAG short wavelength laser, controls card control X, Y by RTC4
Axis galvanometer scanning system completes one layer of powdering of forming platform to control laser in the focal position of forming platform system
Fusing forming, the formation cylinder of forming platform system and the servo motor of powdering system are controlled by PLC controller, complete forming platform
Powdering, the servo motor use Baldor VSSEWDM3541 motor；Powder recovery system is by collection powder cylinder, fan, vacuum
Pump and strainer are constituted；Atmosphere protection system provides device, booster, argon gas holding vessel and feeding tank composition, feeding tank by argon gas
On be provided with exhaust outlet and pressure gauge.
3. a kind of metal powder SLM forming process dynamic recycling repair system according to claim 1, it is characterised in that:
The metal powder screening plant is made of screening storage tank, ultrasonic wave double precision screening plant and vacuum pump, storage tank top
The feed inlet for being provided with the sealing cover of openable addition metal powder and connecting with powder recovery system, lower part is provided with control
Powder enters the control valve of screening plant inlet, inside ultrasonic wave double precision screening plant setting ultrasonic vibration generating device and
Powder net is sieved, bulky grain discharge port, little particle discharge port, medium grain discharge port is additionally provided in equipment, is also set on each discharge port
It is equipped with gas vent, medium grain Material collecting box for harvesting is connected on medium grain discharge port, medium grain Material collecting box for harvesting connects a vacuum pump.
4. a kind of metal powder SLM forming process dynamic recycling repair system according to claim 1, it is characterised in that:
The atmosphere protection and cooling drying equipment are made of argon gas feed equipment and the cooling drying equipment of liquid nitrogen, argon gas feed equipment by
Argon gas provides device, booster, argon gas holding vessel and feeding tank composition, is provided with exhaust outlet and pressure gauge, liquid nitrogen on feeding tank
Cooling drying equipment is made of drying box and condenser, and drying box is connected with condenser by circulating line, is also connected on condenser
It is connected to vacuum tube.
5. a kind of metal powder SLM forming process dynamic recycling repair system according to claim 1, it is characterised in that:
The metal powder prosthetic appliance is by reparation storage tank, plasma rotating electrode forming device and metal powder cooling and storing dress
Composition is set, repairs and is connected to powder feed inlet and atmosphere circulation and purification device, plasma rotating electrode forming device on storage tank
It is made of plasma rotating electrode forming spray chamber, electrode assembly and plasmatorch generating device, metal powder cooling and storing
Vacuum pump is terminated under device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821573684.4U CN208825555U (en) | 2018-09-26 | 2018-09-26 | Metal powder SLM forming process dynamic recycling repair system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110561584A (en) * | 2019-09-29 | 2019-12-13 | 浙江海洋大学 | device and method for 3D printing of coral reef |
| CN113102777A (en) * | 2021-03-29 | 2021-07-13 | 西北工业大学 | Device and method for improving utilization rate of powder produced by additive manufacturing of powder feeding metal |
| WO2024012012A1 (en) * | 2022-07-13 | 2024-01-18 | 江苏大学 | Selective laser melting gradient powder recovery apparatus and recovery method |
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2018
- 2018-09-26 CN CN201821573684.4U patent/CN208825555U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110561584A (en) * | 2019-09-29 | 2019-12-13 | 浙江海洋大学 | device and method for 3D printing of coral reef |
| CN113102777A (en) * | 2021-03-29 | 2021-07-13 | 西北工业大学 | Device and method for improving utilization rate of powder produced by additive manufacturing of powder feeding metal |
| WO2024012012A1 (en) * | 2022-07-13 | 2024-01-18 | 江苏大学 | Selective laser melting gradient powder recovery apparatus and recovery method |
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