CN108958341A - A kind of increasing material manufacturing laser formation equipment atmosphere control system and method - Google Patents
A kind of increasing material manufacturing laser formation equipment atmosphere control system and method Download PDFInfo
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- CN108958341A CN108958341A CN201811105995.2A CN201811105995A CN108958341A CN 108958341 A CN108958341 A CN 108958341A CN 201811105995 A CN201811105995 A CN 201811105995A CN 108958341 A CN108958341 A CN 108958341A
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- 238000000034 method Methods 0.000 title claims abstract description 55
- 239000000463 material Substances 0.000 title claims abstract description 29
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 28
- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 24
- 239000007789 gas Substances 0.000 claims abstract description 117
- 238000006073 displacement reaction Methods 0.000 claims abstract description 85
- 238000000465 moulding Methods 0.000 claims abstract description 52
- 230000033228 biological regulation Effects 0.000 claims abstract description 41
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000001301 oxygen Substances 0.000 claims abstract description 29
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 29
- 239000011261 inert gas Substances 0.000 claims abstract description 27
- 238000007664 blowing Methods 0.000 claims abstract description 6
- 238000010276 construction Methods 0.000 claims abstract description 4
- 239000000428 dust Substances 0.000 claims description 46
- 230000000087 stabilizing effect Effects 0.000 claims description 35
- 230000001105 regulatory effect Effects 0.000 claims description 19
- 238000007493 shaping process Methods 0.000 claims description 18
- 238000001514 detection method Methods 0.000 claims description 14
- 239000000843 powder Substances 0.000 claims description 14
- 230000003750 conditioning effect Effects 0.000 claims description 6
- 230000007423 decrease Effects 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 230000003287 optical effect Effects 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 6
- 239000002699 waste material Substances 0.000 abstract description 5
- 238000002360 preparation method Methods 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 239000002243 precursor Substances 0.000 description 2
- 238000007790 scraping Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D27/00—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00
- G05D27/02—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00 characterised by the use of electric means
-
- 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
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/105—Sintering only by using electric current other than for infrared radiant energy, laser radiation or plasma ; by ultrasonic bonding
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The present invention relates to a kind of increasing material manufacturing laser formation equipment atmosphere control system and methods, belong to increases material manufacturing technology field, the system includes: inert gas replacement unit, for according to the connected space volume of forming area and the oxygen content of setting, the displacement gas scale of construction needed for calculating, and control the intracorporal gas displacement of forming cavity；Voltage regulation unit, for adjusting the pressure in molding cavity in forming process；Differential pressure regulation unit, for adjusting the blowing air quantity during forming.Control climate is carried out using the system, it is divided into the automatic control process in system debug early period process and later period, solving the control climate of increasing material manufacturing laser formation equipment in the prior art, there are inert gas wastes, the technical problem that control program is complicated, gas parameter is inconsistent, interchangeability is poor, reduce gas waste, improve stability, unify the tuning parameters such as pressure, flow, differential pressure, improves batch device interchangeability.
Description
Technical field
The invention belongs to increases material manufacturing technology fields, more particularly to a kind of increasing material manufacturing laser formation equipment control climate
System and method.
Background technique
Currently, it is that powder is melted or be bonded to by energy source that the increasing material manufacturing mainstream technology of industrial application, which is all using laser,
The technologies such as type, such as SLM, SLS, LSF.Laser can occur anti-during carrying out powder melts with gases such as oxygen, nitrogen
It answers, causes forming part off quality.To prevent from being oxidized during powder melts, general increasing material manufacturing laser at
The machining area of type equipment is in inert gas shielding or in vacuum environment.
Following methods are generallyd use in the prior art and carry out control climate: first by inlet and outlet valve and manual flow
Meter, adjustment equipment various pieces inert gas inlet, and by lambda sensor detection forming area oxygen content, when oxygen content compared with
When low, close big flow inert gas and enter valve, open small flow inert gas and enter valve, to maintain in entire forming process
Required atmosphere.
But it has the disadvantage in that (1) entire forming process medium-small flow gas is passed through always in above-mentioned technology, makes oxygen content
It is persistently reduced after reaching requirement, thereby results in unnecessary waste；(2) it happens suddenly in forming process and surprisingly oxygen content is caused to rise,
It will lead to big flow gas to toggle with small-flow gas, control program is troublesome and stabilization of equipment performance is poor；(3) according to same model
Its small-flow gas numerical value needed such as the installation difference of distinct device, sealing difference differs, and batch device gas circuit is caused to debug
Parameter is inconsistent；(4) in forming process with model distinct device inside cavity pressure according to installation difference, sealing difference and gas circuit
The conditions such as control are inconsistent, cause detection pressure value inconsistent, cause flow parameter in system, differential pressure parameter etc. impacted, most
Blower, filtration system parameter value are influenced eventually, cause equipment debugging difficulty, interchangeability poor.Therefore, how to possess forming area more
Good gas control environment, is a urgent problem to be solved.
Summary of the invention
In view of the problems of the existing technology, the present invention provides a kind of increasing material manufacturing laser formation equipment control climate systems
System and method carry out control climate using the system, solve the atmosphere control of increasing material manufacturing laser formation equipment in the prior art
It makes there are inert gas waste, control the technical problem that program is complicated, gas parameter is inconsistent, interchangeability is poor.
One of the objects of the present invention is to provide a kind of increasing material manufacturing laser formation equipment atmosphere control systems, comprising:
Inert gas replacement unit, for calculating according to the connected space volume of forming area and the oxygen content of setting
The required displacement gas scale of construction, and control the intracorporal gas displacement of forming cavity；
Voltage regulation unit, for adjusting the pressure in molding cavity in forming process；
Differential pressure regulation unit, for adjusting the blowing air quantity during forming.
In the above-mentioned technical solutions, it is preferred that the inert gas replacement unit includes gas displacement controller；
And be connected with the gas displacement controller: dust removal cabinet intake valve, dust removal cabinet exhaust valve, gas displacement air inlet
Valve, gas displacement exhaust valve control the flow control of molding cavity, the charge flow rate for receiving powder tank, shaping axle and dust removal cabinet respectively
Valve one, flow control valve two, flow control valve three and flow control valve four measure air inlet total amount during entire gas displacement
The lambda sensor of gas oxygen content in electronic flowmeter, and detection molding cavity；The dust removal cabinet intake valve, flow control valve
Four, dust removal cabinet and dust removal cabinet exhaust valve are sequentially connected, and the gas displacement intake valve, flow control valve one, molding cavity are gentle
Body displacement exhaust valve is sequentially connected, and the gas displacement intake valve, flow control valve two and receipts powder tank are sequentially connected, the gas
Displacement intake valve, flow control valve three and shaping axle are sequentially connected, the electronic flowmeter respectively with gas displacement intake valve, remove
Dirt cabinet intake valve is connected.
When the displacement of forming process precursor gas, dust removal cabinet is opened into and out of air valve and gas displacement into and out of air valve, and is led to
Electronic flowmeter and lambda sensor feedback signal are crossed, when oxygen content drops to setting value or less, dust removal cabinet is into and out of air valve and gas
Body displacement is closed into and out of air valve.
In the above-mentioned technical solutions, it is preferred that the voltage regulation unit includes voltage-stabilizing controller；
And be connected with the voltage-stabilizing controller: pressure stabilizing intake valve, pressure stabilizing exhaust valve control pressure in molding cavity
The pressure sensor of pressure in electronic pressure regulating valve, and detection molding cavity；The pressure stabilizing intake valve, electronic pressure regulating valve, optical system
System microscope group, molding cavity and pressure stabilizing exhaust valve are sequentially connected.
In equipment preparation process and during molding, pressure that voltage-stabilizing controller is fed back according to molding cavity pressure sensor
Force value controls electronic pressure regulating valve and pressure stabilizing into and out of air valve and adjusting is opened and closed.
In the above-mentioned technical solutions, it is preferred that the differential pressure regulation unit includes differential pressure regulation controller；
And be connected with the differential pressure regulation controller: the differential pressure pick-up of differential pressure between detection filter core and blast pipe,
With the frequency converter of blower.
In equipment forming process, differential pressure regulation controller adjusts fan delivery and protects according to the value of feedback of differential pressure pick-up
It is uniform to demonstrate,prove molded surface blowing.
In the above-mentioned technical solutions, it is further preferred that further including discharge filter, the discharge filter respectively with remove
Dirt cabinet exhaust valve, gas displacement exhaust valve, pressure stabilizing exhaust valve are connected.
Discharge filter is discharged after being filtered the gas being discharged out of dust removal cabinet and molding cavity.
In the above-mentioned technical solutions, it is further preferred that the inertia of entire control system is arranged in the electronic flowmeter
On gas inlet manifold road, manual main valve and pressure-regulating valve are additionally provided on the total pipeline at inert gas entrance.With control
The opening and closing of total pipeline processed and the admission pressure of whole system.
It is another object of the present invention to provide a kind of increasing material manufacturing laser formation equipment control climate methods, including such as
Lower step:
1) it controls voltage regulation unit: system pressure being made to be maintained at setting value；
2) it controls inert gas replacement unit: control valve is passed in and out by opening gas, to the connection for needing gas displacement
It is filled with inert gas in space and carries out gas displacement, detects the intracorporal gas oxygen content of forming cavity with lambda sensor, works as gas oxygen
When content reaches threshold value, closes gas and pass in and out control valve；
3) control differential pressure regulation unit: the air quantity in detection forming process in forming cavity adjusts blower when air quantity variation
Frequency Converter Control blower, guarantee air quantity it is constant.
The detailed process of the step 1) are as follows: molding cavity is sealed, pressure value needed for inputting, open voltage-stabilizing controller and press
Button, pressure stabilizing inlet open, electronic pressure regulating valve are opened, and system reaches required pressure, close pressure stabilizing intake valve and electronic pressure regulating valve；Debugging
Shaping axle and powder-scraping device, when shaping axle platform decline when, molding cavity volume increase, pressure reduction, then pressure stabilizing inlet open,
Electronic pressure regulating valve is opened, and conditioning system pressure reaches setting value；When shaping axle platform rises, molding cavity volume reduces, pressure
It increases, pressure stabilizing exhaust valve is frequently opened and closed, and conditioning system pressure reaches setting value, and generates with exhaust.
The detailed process of the step 2) are as follows: open gas displacement controller buttons, dust removal cabinet inlet open, dust removal cabinet row
Air valve is opened, and gas displacement inlet open, gas displacement exhaust valve open, molding cavity lambda sensor detected value gradually decrease, and is opened
Blower closes dust removal cabinet intake valve, dust removal cabinet exhaust valve, gas displacement air inlet when lambda sensor detected value is lower than required value
Valve and gas displacement exhaust valve；When any reason causes oxygen content to rise and is greater than required value, reopens valve and carry out gas
Body displacement.
The detailed process of the step 3) are as follows: when long-time using filter core cause filter core differential pressure pick-up value of feedback increase,
Differential pressure regulation controller buttons are opened, differential pressure regulation controller automatically adjusts fan frequency conversion value and increases, guarantee that air quantity is constant, until
Forming process terminates.If filter core differential pressure reaches alarming value during molding, then suspend molding, replacement filter core re-equips molding stream
Journey.
The advantages and positive effects of the present invention are:
The present invention reduces gas by the inert gas replacement unit, voltage regulation unit and the differential pressure regulation unit that automatically control
Body waste, improves stability, has unified the tuning parameters such as pressure, flow, differential pressure, improve batch device interchangeability.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of increasing material manufacturing laser formation equipment atmosphere control system provided in an embodiment of the present invention；
Fig. 2 is the voltage regulation unit of increasing material manufacturing laser formation equipment atmosphere control system provided in an embodiment of the present invention and lazy
The control climate flow chart of property gas displacement unit；
Fig. 3 is the differential pressure of increasing material manufacturing laser formation equipment atmosphere control system forming process provided in an embodiment of the present invention
Adjust the control climate flow chart of unit.
In figure: 1- molding cavity, 2- shaping axle, 3- receive powder tank, 4- optical system microscope group, 5- filter core, 6- blower, 7- dedusting
Cabinet, 8- discharge filter, 9- blast pipe, 10- discharge pipe, V1- manual control main valve, V2- dust removal cabinet intake valve, V3- gas displacement into
Air valve, V4- pressure stabilizing intake valve, V5- dust removal cabinet exhaust valve, V6- pressure stabilizing exhaust valve, V7- gas displacement exhaust valve, V8- flow tune
Save valve, R1- pressure-regulating valve, R2- electronic pressure regulating valve, R3- flow control valve one, R4- flow control valve two, R5- flow control
Valve three, R6- flow control valve four, SQ- electronic flowmeter, SP- pressure sensor, SO2-Lambda sensor, S Δ P- differential pressure pick-up,
SV- Air Flow Rate Instrument.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, and cooperate attached
The present invention will be described in further detail for figure.Those skilled in the art should know following specific embodiments or specific implementations
Mode is the set-up mode for the series of optimum that the present invention is enumerated Wei specific summary of the invention is explained further, and these set
Set can be combined with each other between mode or it is interrelated use, unless clearly proposing some of them in the present invention
Or a certain specific embodiment or embodiment can not be associated setting or be used in conjunction with other embodiments or embodiment.
Meanwhile following specific embodiments or embodiment be only as the set-up mode optimized, and not as limiting guarantor of the invention
Protect the understanding of range.
In addition, it will be understood by those skilled in the art that pair come out cited by following specific embodiments and embodiment
In the specific value of parameter setting, it is that explanation for example is used, as an optional embodiment, and is not construed as to this hair
The restriction of bright protection scope；And the setting of each algorithm being directed to and its parameter, it also only explains and uses as an example, and under
State the formal argument of parameter and the Conventional mathematicals of following algorithms derived, be regarded as falling into protection scope of the present invention it
It is interior.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " connected " " connects
Connect " it shall be understood in a broad sense, for example, it may be being fixedly connected, it may be a detachable connection, or be integrally connected；It can be machine
Tool connection, is also possible to be electrically connected；It can be directly connected, two members can also be can be indirectly connected through an intermediary
Connection inside part.For the ordinary skill in the art, above-mentioned term can be understood in the present invention with concrete condition
Concrete meaning.
Embodiment 1
Referring to Fig. 1, the present embodiment provides a kind of increasing material manufacturing laser formation equipment atmosphere control systems, comprising:
Inert gas replacement unit, for calculating according to the connected space volume of forming area and the oxygen content of setting
The required displacement gas scale of construction, and control the intracorporal gas displacement of forming cavity；
Voltage regulation unit, for adjusting the pressure in molding cavity in forming process；
Differential pressure regulation unit, for adjusting the blowing air quantity during forming.
As preferred embodiment, inert gas replacement unit includes gas displacement controller；
And be connected with gas displacement controller: dust removal cabinet intake valve V2, dust removal cabinet exhaust valve V5, gas displacement air inlet
Valve V3, gas displacement exhaust valve V7 control the charge flow rate of molding cavity 1, receipts powder tank 3, shaping axle 2 and dust removal cabinet 7 respectively
One R3 of flow control valve, four R6 of two R4 of flow control valve, three R5 of flow control valve and flow control valve, measure entire gas displacement
The lambda sensor SO of gas oxygen content in the electronic flowmeter SQ of air inlet total amount in the process, and detection molding cavity2；Dust removal cabinet into
Air valve V2, four R6 of flow control valve, dust removal cabinet 7 and dust removal cabinet exhaust valve V5 are sequentially connected, gas displacement intake valve V3, flow control
One R3 of valve, molding cavity 1 and gas displacement exhaust valve V7 processed are sequentially connected, gas displacement intake valve V3, two R4 of flow control valve
It is sequentially connected with powder tank 3 is received, gas displacement intake valve V3, three R5 of flow control valve and shaping axle 2 are sequentially connected, electronic flowmeter
SQ is connected with gas displacement intake valve V3, dust removal cabinet intake valve V2 respectively.
When the displacement of forming process precursor gas, dust removal cabinet is opened into and out of air valve and gas displacement into and out of air valve, and is led to
Electronic flowmeter and lambda sensor feedback signal are crossed, when oxygen content drops to setting value or less, dust removal cabinet is into and out of air valve and gas
Body displacement is closed into and out of air valve.
As preferred embodiment, voltage regulation unit includes voltage-stabilizing controller；
And be connected with voltage-stabilizing controller: pressure stabilizing intake valve V4, pressure stabilizing exhaust valve V6 control pressure in molding cavity
The pressure sensor SP of pressure in electronic pressure regulating valve R2, and detection molding cavity；Pressure stabilizing intake valve V4, electronic pressure regulating valve R2, light
System microscope group 4, molding cavity 1 and pressure stabilizing exhaust valve V6 are sequentially connected.
In equipment preparation process and during molding, pressure that voltage-stabilizing controller is fed back according to molding cavity pressure sensor
Force value controls electronic pressure regulating valve and pressure stabilizing into and out of air valve and adjusting is opened and closed.
As preferred embodiment, differential pressure regulation unit includes differential pressure regulation controller；
And be connected with differential pressure regulation controller: the differential pressure pick-up S Δ of differential pressure between detection filter core 5 and blast pipe 9
The frequency converter of P and blower 6.
In equipment forming process, differential pressure regulation controller adjusts fan delivery and protects according to the value of feedback of differential pressure pick-up
It is uniform to demonstrate,prove molded surface blowing.
It further include discharge filter 8 as further preferred embodiment, discharge filter 8 is vented with dust removal cabinet respectively
Valve V5, gas displacement exhaust valve V7, pressure stabilizing exhaust valve V6 are connected.
Discharge filter is discharged after being filtered the gas being discharged out of dust removal cabinet and molding cavity.
As further preferred embodiment, the inert gas entrance that entire control system is arranged in electronic flowmeter SQ is total
On pipeline, manual main valve V1 and pressure-regulating valve R1 is additionally provided on the total pipeline at inert gas entrance.To control general pipeline
The opening and closing in road and the admission pressure of whole system.
Embodiment 2
The present embodiment provides a kind of increasing material manufacturing laser formation equipment control climate method, the predominantly later period was automatically controlled
Journey includes the following steps:
1) it controls voltage regulation unit: system pressure being made to be maintained at setting value；
2) it controls inert gas replacement unit: control valve is passed in and out by opening gas, to the connection for needing gas displacement
It is filled with inert gas in space and carries out gas displacement, detects the intracorporal gas oxygen content of forming cavity with lambda sensor, works as gas oxygen
When content reaches threshold value, closes gas and pass in and out control valve；
3) control differential pressure regulation unit: the air quantity in detection forming process in forming cavity adjusts blower when air quantity variation
Frequency Converter Control blower, guarantee air quantity it is constant.
Before carrying out later period automatic control process, need first to carry out system debug early period process, system debug early period packet
Include the debugging of inert gas replacement unit, voltage regulation unit debugging and the debugging of differential pressure regulation unit.
Referring to Fig. 1, inert gas replacement unit debugs detailed process are as follows: first passes through meter during system debug early period
Be counted as cavity 1, shaping axle 2, receive powder tank 3, dust removal cabinet 7 gas displacement in need connected space volume, further according to needs
The connected space volume of gas displacement calculates charge flow rate required for each volume when oxygen content is dropped to required value.
More specifically, it first passes through and calculates molding cavity 1, shaping axle 2 receives powder tank 3, and the equal gas in need of dust removal cabinet 7 is set
The connected space volume V changed1、V2、V3、V7Deng, and utilize and be thoroughly mixed Transformation formula(wherein, VtFor required gas
Amount, VRFor displacement volume, C1For oxygen content at the beginning of container, C2For container end oxygen content), it calculates oxygen content from C1(in atmosphere
21%) C, is dropped to2Displaced volume V when (required value)R(VR=V1+V2+V3+V7) required for total tolerance Vt, then use formula
(wherein, Q is gas displacement flow value, and t is gas displacement process the time required), during finally obtaining entire gas displacement
Required charge flow rate Q, then pass throughNumeric ratio, calculate air inlet required for each volume respectively
Flow Q1、Q2、Q3、Q7Value；Again by one R3 of flow control valve, two R4 of flow control valve, three R5 of flow control valve, flow control valve
Four R6 are closed, and open dust removal cabinet intake valve V2, gas displacement intake valve V3, dust removal cabinet exhaust valve V5, gas displacement exhaust valve V7；
One R3 of flow control valve, two R4 of flow control valve, three R5 of flow control valve, four R6 of flow control valve are adjusted one by one, and with reference to electricity
Show value in subflow meter SQ guarantees one R3 of flow control valve, two R4 of flow control valve, three R5 of flow control valve, flow control
The output flow of four R6 of valve processed is respectively to calculate gained Q1、Q3、Q2、Q7Value.
During system debug early period, voltage regulation unit debugs detailed process are as follows: opens pressure stabilizing intake valve V4 and electronic pressure regulating
Electronic pressure regulating valve R2 is gradually tuned up input value W from lower limit value by valve R2, and reads pressure sensor SP corresponding pressure value P, is obtained
To the relationship of W and P；And input value W is converted into input pressure correlation P0, obtain the corresponding relationship of P0 and P.
During system debug early period, differential pressure regulation unit debugs detailed process are as follows: first installs air quantity on discharge pipe 10
Flow control valve V8 is installed on instrument SV, blast pipe 9, according to pressure value required in different materials forming process, opens pressure stabilizing
Unit simultaneously opens blower 6, and adjusting fan delivery makes Air Flow Rate Instrument SV reach setting value, and records the value of differential pressure pick-up S Δ P；By
Flow control valve V8 is gradually closed, increases the frequency conversion value of blower 6, so that Air Flow Rate Instrument SV is maintained at desired value, record differential pressure pick-up
Corresponding relationship of the value (alarming value required no more than replacement filter core) with fan frequency conversion value.
After the completion of debugging, when equipment works normally, Air Flow Rate Instrument SV and flow control valve V8 is removed.It takes and automatically controlled
Journey.
Referring to Fig. 2, equipment is in the preparation state before work, molding cavity 1 is sealed, system pressure 0, inputs institute
Pressure value P 0 is needed, voltage-stabilizing controller button is opened, pressure stabilizing intake valve V4 is opened, electronic pressure regulating valve R2 is opened, and system reaches required pressure,
Close pressure stabilizing intake valve and electronic pressure regulating valve；Shaping axle 2 and powder-scraping device are debugged, when the decline of 2 platform of shaping axle, molding cavity
1 volume increases, and pressure reduction, then pressure stabilizing intake valve V4 is opened, electronic pressure regulating valve R2 is opened, and conditioning system pressure reaches setting value, mirror
Face surrounding is generated with air inlet, prevents powder from flying upward pollution mirror surface；When 2 platform of shaping axle rises, 1 volume of molding cavity subtracts
Small, pressure rise, pressure stabilizing exhaust valve V6 is frequently opened and closed, and conditioning system pressure reaches setting value, and generates with exhaust.
Equipment early-stage preparations process finishes, and starts to be filled with inert gas progress gas displacement, opens gas displacement controller
Button, dust removal cabinet intake valve V2 is opened, dust removal cabinet exhaust valve V5 is opened, and gas displacement intake valve V3 is opened, gas displacement exhaust valve V7 is opened,
Molding cavity lambda sensor SO2Detected value gradually decreases, and opens blower 6, when lambda sensor detected value is lower than required value, closes
Dust removal cabinet intake valve, dust removal cabinet exhaust valve, gas displacement intake valve and gas displacement exhaust valve；When any reason leads to oxygen content
When rising and being greater than required value, reopens valve and carry out gas displacement.
Gas displacement process finishes, and forming process starts, referring to Fig. 3, leading to filter core differential pressure using filter core 5 when for a long time
Sensor S Δ P value of feedback increases, and opens differential pressure regulation controller buttons, and differential pressure regulation controller automatically adjusts fan frequency conversion value
Increase, guarantee that air quantity is constant, influence of the filter core blocking to forming process is eliminated, until forming process terminates.If during molding, filter
Core differential pressure reaches alarming value, then suspends molding, and replacement filter core re-equips molding process.
Equipment is constantly in the state that pressure stabilizing, low oxygen content, differential pressure compensate automatically in whole equipment forming process, because appointing
The variation of 1 pressure value of molding cavity, oxygen content value and differential pressure value caused by what reason can all be compensated, to realize gas displacement
The automatic control of unit, voltage regulation unit, differential pressure regulation unit.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used
To modify to technical solution documented by previous embodiment, or some or all of the technical features are equal
Replacement, and these are modified or replaceed, the model for technical solution of the embodiment of the present invention that it does not separate the essence of the corresponding technical solution
It encloses.
Claims (10)
1. a kind of increasing material manufacturing laser formation equipment atmosphere control system, it is characterised in that: include:
Inert gas replacement unit, for according to the connected space volume of forming area and the oxygen content of setting, needed for calculating
The displacement gas scale of construction, and control the intracorporal gas displacement of forming cavity；
Voltage regulation unit, for adjusting the pressure in molding cavity in forming process；
Differential pressure regulation unit, for adjusting the blowing air quantity during forming.
2. increasing material manufacturing laser formation equipment atmosphere control system according to claim 1, it is characterised in that: the inertia
Gas displacement unit includes gas displacement controller；
And be connected with the gas displacement controller: dust removal cabinet intake valve, dust removal cabinet exhaust valve, gas displacement intake valve,
Gas displacement exhaust valve controls the flow control valve of molding cavity, the charge flow rate for receiving powder tank, shaping axle and dust removal cabinet respectively
One, flow control valve two, flow control valve three and flow control valve four, measure the electricity of air inlet total amount during entire gas displacement
The lambda sensor of gas oxygen content in subflow meter, and detection molding cavity；The dust removal cabinet intake valve, flow control valve four,
Dust removal cabinet and dust removal cabinet exhaust valve are sequentially connected, and the gas displacement intake valve, flow control valve one, molding cavity and gas are set
The air valve that changes gear is sequentially connected, and the gas displacement intake valve, flow control valve two and receipts powder tank are sequentially connected, the gas displacement
Intake valve, flow control valve three and shaping axle are sequentially connected, the electronic flowmeter respectively with gas displacement intake valve, dust removal cabinet
Intake valve is connected.
3. increasing material manufacturing laser formation equipment atmosphere control system according to claim 1, it is characterised in that: the pressure stabilizing
Unit includes voltage-stabilizing controller；
And be connected with the voltage-stabilizing controller: pressure stabilizing intake valve, pressure stabilizing exhaust valve control the electronics of pressure in molding cavity
The pressure sensor of pressure in pressure regulator valve, and detection molding cavity；The pressure stabilizing intake valve, electronic pressure regulating valve, optical system mirror
Group, molding cavity and pressure stabilizing exhaust valve are sequentially connected.
4. increasing material manufacturing laser formation equipment atmosphere control system according to claim 1, it is characterised in that: the differential pressure
Adjusting unit includes differential pressure regulation controller；
And be connected with the differential pressure regulation controller: the differential pressure pick-up and wind of differential pressure between detection filter core and blast pipe
The frequency converter of machine.
5. increasing material manufacturing laser formation equipment atmosphere control system according to claim 2 or 3, it is characterised in that: also wrap
Discharge filter is included, the discharge filter is connected with dust removal cabinet exhaust valve, gas displacement exhaust valve, pressure stabilizing exhaust valve respectively.
6. increasing material manufacturing laser formation equipment atmosphere control system according to claim 2, it is characterised in that: the electronics
Flowmeter is arranged on the inert gas entrance total pipeline of entire control system, also sets on the total pipeline at inert gas entrance
It is equipped with manual main valve and pressure-regulating valve.
7. a kind of carry out increasing material manufacturing laser formation equipment gas using atmosphere control system of any of claims 1-6
Atmosphere control method, characterized by the following steps:
1) it controls voltage regulation unit: system pressure being made to be maintained at setting value；
2) it controls inert gas replacement unit: control valve is passed in and out by opening gas, to the connected space for needing gas displacement
It is inside filled with inert gas and carries out gas displacement, the intracorporal gas oxygen content of forming cavity is detected with lambda sensor, when gas oxygen content
When reaching threshold value, closes gas and pass in and out control valve；
3) control differential pressure regulation unit: the air quantity in detection forming process in forming cavity adjusts the change of blower when air quantity variation
Frequency device controls blower, guarantees that air quantity is constant.
8. increasing material manufacturing laser formation equipment control climate method according to claim 7, it is characterised in that: the step
1) detailed process are as follows: molding cavity is sealed, pressure value needed for inputting, unlatching voltage-stabilizing controller button, pressure stabilizing inlet open,
Electronic pressure regulating valve is opened, and system reaches required pressure, closes pressure stabilizing intake valve and electronic pressure regulating valve；Debugging shaping axle is filled with powder is scraped
It sets, when the decline of shaping axle platform, molding cavity volume increases, and pressure reduction, then pressure stabilizing inlet open, electronic pressure regulating valve are opened,
Conditioning system pressure reaches setting value；When shaping axle platform rises, molding cavity volume reduces, pressure rise, pressure stabilizing exhaust
Valve is frequently opened and closed, and conditioning system pressure reaches setting value, and generates with exhaust.
9. increasing material manufacturing laser formation equipment control climate method according to claim 7, it is characterised in that: the step
2) detailed process are as follows: open gas displacement controller buttons, dust removal cabinet inlet open, dust removal cabinet exhaust valve open, gas displacement
Inlet open, gas displacement exhaust valve open, molding cavity lambda sensor detected value gradually decrease, and open blower, work as lambda sensor
When detected value is lower than required value, dust removal cabinet intake valve, dust removal cabinet exhaust valve, gas displacement intake valve and gas displacement exhaust are closed
Valve；When any reason causes oxygen content to rise and is greater than required value, reopens valve and carry out gas displacement.
10. increasing material manufacturing laser formation equipment control climate method according to claim 7, it is characterised in that: the step
Rapid detailed process 3) are as follows: when long-time leads to the raising of filter core differential pressure pick-up value of feedback, unlatching differential pressure regulation control using filter core
Device button processed, differential pressure regulation controller automatically adjust fan frequency conversion value and increase, and guarantee that air quantity is constant, until forming process terminates.
If filter core differential pressure reaches alarming value during molding, then suspend molding, replacement filter core re-equips molding process.
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| CN117696919A (en) | 2024-03-15 |
| CN108958341B (en) | 2023-10-27 |
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Denomination of invention: An atmosphere control system and method for additive manufacturing laser forming equipment Granted publication date: 20231027 Pledgee: Bank of China Tianjin Heping Branch Pledgor: TIANJIN RADIUM LASER TECHNOLOGY Co.,Ltd. Registration number: Y2024980010582 |