CN117270592A - Dynamic control system and method for metal 3D printing pressure and atmosphere - Google Patents
Dynamic control system and method for metal 3D printing pressure and atmosphere Download PDFInfo
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- CN117270592A CN117270592A CN202210670013.4A CN202210670013A CN117270592A CN 117270592 A CN117270592 A CN 117270592A CN 202210670013 A CN202210670013 A CN 202210670013A CN 117270592 A CN117270592 A CN 117270592A
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- 239000002184 metal Substances 0.000 title claims abstract description 38
- 238000010146 3D printing Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 19
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 104
- 239000001301 oxygen Substances 0.000 claims abstract description 104
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 104
- 238000012544 monitoring process Methods 0.000 claims abstract description 58
- 238000004891 communication Methods 0.000 claims abstract description 31
- 230000004907 flux Effects 0.000 claims description 44
- 230000008859 change Effects 0.000 claims description 27
- 238000011144 upstream manufacturing Methods 0.000 claims description 7
- 230000001276 controlling effect Effects 0.000 description 26
- 239000007789 gas Substances 0.000 description 7
- 238000007639 printing Methods 0.000 description 4
- 238000000465 moulding Methods 0.000 description 3
- 230000003044 adaptive effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D16/00—Control of fluid pressure
- G05D16/20—Control of fluid pressure characterised by the use of electric means
- G05D16/2006—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means
- G05D16/2013—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means
- G05D16/2026—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means with a plurality of throttling means
-
- 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
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Control Of Fluid Pressure (AREA)
Abstract
The application provides a metal 3D prints pressure and atmosphere dynamic control system, including central control module and rather than communication connection's pressure monitoring module, atmosphere monitoring module, air inlet control module and air outlet control module. The pressure monitoring module is used for monitoring the pressure in the forming chamber; the atmosphere monitoring module is used for monitoring the oxygen content in the forming chamber; the air inlet control module comprises an adjustable air inlet valve and an electronic flowmeter, the adjustable air inlet valve and the electronic flowmeter are arranged on an air inlet channel communicated with the forming chamber, the electronic flowmeter is used for measuring the air inlet flow of the air inlet channel, and the adjustable air inlet valve is used for adjusting the amount of air entering the forming chamber; the air outlet control module comprises an adjustable air outlet valve, the adjustable air outlet valve is arranged on an air outlet channel communicated with the forming chamber, and the adjustable air outlet valve is used for adjusting the amount of air discharged out of the forming chamber. The application also provides a metal 3D printing pressure and atmosphere dynamic control method applying the metal 3D printing pressure and atmosphere dynamic control system.
Description
Technical Field
The application relates to the field of metal 3D printing, in particular to a metal 3D printing pressure and atmosphere dynamic control system and a metal 3D printing pressure and atmosphere dynamic control method using the same.
Background
In existing metal 3D printers, a mechanical flowmeter is usually used to cooperate with a through valve to construct a printing ventilation, and in this ventilation mode, the flux of the inlet air and the outlet air is often fixed, which leads to a large fluctuation change of the pressure and the atmosphere in the forming chamber in some cases. For example, continuous air intake can cause continuous rise of pressure in the printing chamber, triggering upper pressure limit protection of the purge bin, thereby performing pressure relief action, or because air supply is performed under the condition of insufficient air outlet speed, pressure fluctuation of the forming chamber often exceeds 1Kpa in both cases. On the other hand, at present, the oxygen content control is to control the inlet and exhaust gas of the protective gas by the switching value, and under the condition of controlling the oxygen content by the inlet, the inlet and exhaust gas are controlled by the switching value, because the problem of using the switching value is solved, the inlet flow is in a fixed mode, the exhaust gas is also in a fixed flow mode, the oxygen content control in the forming chamber adopts the oxygen content to reach a certain degree, then the oxygen in the forming chamber is removed, after the oxygen content control is started, the function is started to work, and the work is stopped under the condition of setting low oxygen content, and the method can lead the oxygen content in the forming chamber to have great deviation. When the oxygen removal operation is performed in the molding chamber, the pressure in the molding chamber is also changed, and pressure fluctuation exceeding 3KPa is generated in the molding chamber.
How to solve the above problems, it is needed to provide a metal 3D printing pressure and atmosphere dynamic control system and control method thereof, which can keep the fluctuation range of the air pressure and the oxygen content in the forming chamber small.
Disclosure of Invention
In order to solve the problems in the prior art, an embodiment of the present application provides a metal 3D printing pressure and atmosphere dynamic control system for adjusting atmosphere and pressure in a forming chamber, including:
a central control module for running a programmable control program;
the pressure monitoring module is in communication connection with the central control module and is used for monitoring the pressure in the forming chamber;
the atmosphere monitoring module is in communication connection with the central control module and is used for monitoring the oxygen content in the forming chamber;
the air inlet control module comprises an adjustable air inlet valve and an electronic flowmeter, wherein the adjustable air inlet valve and the electronic flowmeter are arranged on an air inlet channel communicated with the forming chamber, the electronic flowmeter is in communication connection with the central control module and is used for measuring the air inlet flow of the air inlet channel, the adjustable air inlet valve is in communication connection with the central control module, and the adjustable air inlet valve is used for adjusting the amount of air entering the forming chamber;
the air outlet control module comprises an adjustable air outlet valve, the adjustable air outlet valve is arranged on an air outlet channel communicated with the forming chamber, the adjustable air outlet valve is in communication connection with the central control module, and the adjustable air outlet valve is used for adjusting the amount of air discharged out of the forming chamber.
In one possible implementation manner, the metal 3D printing pressure and atmosphere dynamic control system further comprises an electronic pressure gauge triplet, the electronic pressure gauge triplet is arranged on the air inlet channel, the electronic pressure gauge triplet is arranged on the upstream of the air inlet control module, the electronic pressure gauge triplet is in communication connection with the central control module, the electronic pressure gauge triplet is in communication with an air source, and the electronic pressure gauge triplet is used for monitoring the pressure of the air source.
In one possible embodiment, the electronic flow meter is located upstream of the intake passage compared to the adjustable intake valve.
In one possible embodiment, the pressure monitoring module includes a plurality of differential pressure sensors spaced apart within the forming chamber, each of the plurality of differential pressure sensors being communicatively coupled to the central control module.
In one possible embodiment, the adjustable inlet valve and the adjustable outlet valve are electrically operated valves.
The embodiment of the application also provides a metal 3D printing pressure and atmosphere dynamic control method, which is applied to the metal 3D printing pressure and atmosphere dynamic control system, and comprises the following steps:
the pressure monitoring module detects a real-time pressure value in the forming chamber, and transmits the real-time pressure value to the central control module;
the central control module compares the real-time pressure value with a first preset pressure threshold, if the central control module judges that the real-time pressure value is lower than the lower limit of the first preset pressure threshold, the central control module controls the air inlet amount of the air inlet control module to be larger than the air outlet amount of the air outlet control module and continues until the central control module judges that the real-time pressure value is higher than or equal to the lower limit of the first preset pressure threshold, if the central control module judges that the real-time pressure value is higher than the upper limit of the first preset pressure threshold, the central control module controls the air inlet amount of the air inlet control module to be smaller than the air outlet amount of the air outlet control module and continues until the central control module judges that the real-time pressure value is lower than or equal to the lower limit of the first preset pressure threshold, and if the central control module counts that the real-time pressure value is within the first preset pressure threshold, the air inlet amount of the air inlet control module and the air outlet control module are controlled to be unchanged;
the atmosphere monitoring module detects the real-time oxygen content in the forming chamber, and transmits the real-time oxygen content to the central control module;
the central control module compares the real-time oxygen content with a preset oxygen content threshold, if the central control module judges that the real-time oxygen content is within the preset oxygen content threshold, the air inflow of the air inflow control module and the air outflow of the air outflow control module are controlled to be unchanged, and if the central control module judges that the real-time oxygen content is higher than the preset oxygen content threshold, the air inflow of the air inflow control module is controlled to be increased and is continued until the central control module judges that the real-time oxygen content is within the preset oxygen content threshold.
In one possible implementation manner, the step of controlling the air inlet amount of the air inlet control module to be greater than the air outlet amount of the air outlet control module includes: controlling the flux of the adjustable air inlet valve to be increased, or controlling the flux of the adjustable air outlet valve to be reduced, or controlling the flux of the adjustable air inlet valve to be increased and simultaneously controlling the flux of the adjustable air outlet valve to be reduced; the step of controlling the air inflow of the air inflow control module to be smaller than the air outflow of the air outflow control module comprises the following steps: controlling the flux of the adjustable air inlet valve to be reduced, or controlling the flux of the adjustable air outlet valve to be increased, or controlling the flux of the adjustable air inlet valve to be reduced and simultaneously controlling the flux of the adjustable air outlet valve to be increased.
In one possible implementation, the central control module records a plurality of the real-time oxygen contents in a period of continuous time, establishes a coordinate system with time as an abscissa and the real-time oxygen contents as an ordinate, records the change of the plurality of the real-time oxygen contents in the period of continuous time, establishes a linear equation, and obtains the slope of the linear equation; the central control module compares the slope with a preset oxygen change rate threshold, if the central control module judges that the slope is within the oxygen change rate threshold, the air inflow of the air inflow control module and the air outflow of the air outflow control module are controlled to be unchanged, and if the central control module judges that the slope is higher than the oxygen change rate threshold, the air inflow of the air inflow control module is controlled to be increased and the central control module continues until the central control module judges that the slope is within the oxygen change rate threshold.
In one possible implementation manner, when the central control module determines that the real-time oxygen content is higher than the preset oxygen content threshold or the slope is higher than the oxygen change rate threshold and the real-time pressure value is lower than the lower limit of the first preset pressure threshold, the air input of the air input control module is controlled to be increased, the air output of the air output control module is controlled to be reduced or unchanged, and the air input flux of the air input control module is controlled to be greater than the air output flux of the air output control module.
In one possible implementation manner, when the central control module determines that the real-time oxygen content is higher than the preset oxygen content threshold or the slope is higher than the oxygen change rate threshold, and the real-time pressure value is higher than the upper limit of the first preset pressure threshold, the air input of the air input control module is controlled to be increased, the air output of the air output control module is controlled to be increased, and the increment of the air input flux of the air input control module is controlled to be smaller than the increment of the air output flux of the air output control module.
Compared with the prior art, the metal 3D printing pressure and atmosphere dynamic control system establishes a pressure monitoring module, an atmosphere monitoring module, an air inlet control module and an air outlet control module and is in communication connection with the central control module, so that the central control module can adjust the air inlet control module and the air outlet control module in real time according to the monitoring data of the pressure monitoring module and the atmosphere monitoring module, pressure and oxygen content fluctuation in a forming chamber can be controlled in a smaller range, and a pressure protection device in the forming chamber is prevented from being triggered, so that the generation of large-range pressure fluctuation is avoided.
Compared with the prior art, the metal 3D printing pressure and atmosphere dynamic control method has the advantages that the pressure and the oxygen content in the forming chamber are monitored in real time, the air inlet control module and the air outlet control module are adjusted in real time according to the monitoring data of the pressure monitoring module and the atmosphere monitoring module, the air inlet flux and the air outlet flux are adjusted in an adaptive mode by further combining a plurality of factors such as the pressure, the oxygen content and the oxygen content change rate, the pressure and the oxygen content in the forming chamber are always kept at a relatively proper level (for example, positive and negative 0.2 KPa), and the printing atmosphere pressure is stable.
Drawings
Fig. 1 is a schematic structural diagram of a metal 3D printing pressure and atmosphere dynamic control system according to an embodiment of the present application.
Fig. 2 is a schematic diagram of a communication connection relationship structure of a metal 3D printing pressure and atmosphere dynamic control system according to an embodiment of the present application.
Fig. 3 is a schematic flow chart of a metal 3D printing pressure and atmosphere dynamic control method according to an embodiment of the present application.
Description of the main reference signs
Metal 3D printing pressure and atmosphere dynamic control system 1
Central control module 10
Pressure monitoring module 11
Differential pressure sensor 110
Atmosphere monitoring module 12
Air intake control module 13
Adjustable intake valve 131
Electronic flowmeter 132
Air outlet control module 14
Adjustable air outlet valve 141
Intake passage 15
Outlet channel 16
Triplet 17 of electronic pressure gauge
Air source 18
The forming chamber 2 will be described in more detail below with reference to the above figures.
Detailed Description
The following description will refer to the accompanying drawings in order to more fully describe the present application. Exemplary embodiments of the present application are illustrated in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. These exemplary embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the application to those skilled in the art. Like reference numerals designate identical or similar components.
The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Furthermore, as used herein, "comprises" and/or "comprising" and/or "having," integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, regions, integers, steps, operations, elements, and/or groups thereof.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. Furthermore, unless the context clearly defines otherwise, terms such as those defined in a general dictionary should be construed to have meanings consistent with their meanings in the relevant art and the present application, and should not be construed as idealized or overly formal meanings.
The following description of exemplary embodiments will be provided with reference to the accompanying drawings. It is noted that the components depicted in the referenced figures are not necessarily shown to scale; and the same or similar components will be given the same or similar reference numerals or similar technical terms.
The following detailed description of specific embodiments of the present application refers to the accompanying drawings.
As shown in fig. 1 and 2, the embodiment of the present application provides a metal 3D printing pressure and atmosphere dynamic control system 1 for adjusting the atmosphere and pressure in a forming chamber 2. The metal 3D printing pressure and atmosphere dynamic control system 1 comprises a central control module 10, a pressure monitoring module 11, an atmosphere monitoring module 12, an air inlet control module 13 and an air outlet control module 14.
The central control module 10 is used for running a programmable control program.
The pressure monitoring module 11 is in communication with the central control module 10, and the pressure monitoring module 11 is used for monitoring the pressure in the forming chamber 2.
The atmosphere monitoring module 12 is in communication with the central control module 10, and the atmosphere monitoring module 12 is used for monitoring the oxygen content in the forming chamber 2.
The air inlet control module 13 comprises an adjustable air inlet valve 131 and an electronic flowmeter 132, wherein the adjustable air inlet valve 131 and the electronic flowmeter 132 are arranged on an air inlet channel 15 communicated with the forming chamber 2, the electronic flowmeter 132 is in communication connection with the central control module 10, the electronic flowmeter 132 is used for measuring the air inlet flow of the air inlet channel 15, the adjustable air inlet valve 131 is in communication connection with the central control module 10, and the adjustable air inlet valve 131 is used for adjusting the amount of air entering the forming chamber 2;
the air outlet control module 14 comprises an adjustable air outlet valve 141, the adjustable air outlet valve 141 is arranged on an air outlet channel 16 communicated with the forming chamber 2, the adjustable air outlet valve 141 is in communication connection with the central control module 10, and the adjustable air outlet valve 141 is used for adjusting the amount of air discharged out of the forming chamber 2.
Further, the metal 3D printing pressure and atmosphere dynamic control system 1 of the present application establishes a communication connection between the pressure monitoring module 11, the atmosphere monitoring module 12, the air inlet control module 13 and the air outlet control module 14 and the central control module 10, so that the central control module 10 can adjust the air inlet control module 13 and the air outlet control module 14 in real time according to the monitoring data of the pressure monitoring module 11 and the atmosphere monitoring module 12, so that the pressure and oxygen content fluctuation in the forming chamber 2 can be controlled in a smaller range, and the triggering of a pressure protection device (not shown) in the forming chamber 2 is avoided, and the generation of large-range pressure fluctuation in the forming chamber 2 is further avoided.
In an embodiment, the metal 3D printing pressure and atmosphere dynamic control system 1 further includes an electronic pressure gauge triplet 17, the electronic pressure gauge triplet 17 is disposed in the air inlet channel 15, the electronic pressure gauge triplet 17 is disposed at the upstream of the air inlet control module 13, the electronic pressure gauge triplet 17 is in communication connection with the central control module 10, the electronic pressure gauge triplet 17 is in communication with an air source 18, and the electronic pressure gauge triplet 17 is used for monitoring the pressure of the air source 18.
Further, the gas source 18 may be a gas source that supplies a shielding gas, which may be an inert gas, to the forming chamber 2. The electronic pressure gauge triplet 17 is used for detecting whether the air source 18 is normal or not, and specifically, can be used for detecting whether the pressure of the air source 18 is sufficient or not.
In one embodiment, the electronic flow meter 132 is disposed upstream of the intake passage 15 compared to the adjustable intake valve 131.
Further, the electronic flowmeter 132 is disposed upstream of the adjustable air inlet valve 131, so as to avoid interference of the air flowing out reversely from the forming chamber to flow statistics, and the electronic flowmeter 132 may be further disposed in a region closer to the adjustable air inlet valve 131.
In one embodiment, the pressure monitoring module 11 includes a plurality of differential pressure sensors 110, the plurality of differential pressure sensors 110 are disposed in the forming chamber 2 at intervals, and the plurality of differential pressure sensors 110 are all in communication connection with the central control module 10.
Further, the pressure monitoring module 11 may be disposed inside the forming chamber 2 to directly sense the pressure in the forming chamber 2, and the pressure monitoring module 11 may also be disposed outside the forming chamber 2 and in air flow communication with the inside of the forming chamber 2 through a pipe to sense the pressure in the forming chamber 2. The differential pressure sensors 110 may be dispersed within the forming chamber 2 for sensing minute pressure differences in different areas of the forming chamber 2 while obtaining more accurate pressure values. As shown in fig. 1, in the present embodiment, the pressure monitoring module 11 is shown disposed inside and outside the forming chamber 2 at the same time, and in other embodiments, it may alternatively be implemented.
In one embodiment, the adjustable intake valve 131 and the adjustable outlet valve 141 are electrically operated valves.
Furthermore, the electric valve can be used for regulating analog quantities of the air inlet channel 15 and the air outlet channel 16, the central control module 10 is in communication connection with the electric valve, and the air inlet flux and the air outlet flux are stepwise regulated step by step according to different conditions, so that inorganic regulation and control of the pressure and the oxygen content in the forming chamber 2 are realized.
In an embodiment, the central control module 10 may be a controller based on a PLC, performs data collection and processing based on the PLC, and outputs the data after being processed as a related internal algorithm, and performs calculation automatically in the whole process to obtain a result and act on equipment, so that the central control module can be well docked with an upper computer.
In one embodiment, the pressure monitoring module 11, the atmosphere monitoring module 12, the air inlet control module 13 and the air outlet control module 14 can transmit the collected sensing data to the central control module 10 through communication means such as analog quantity and RS485 communication.
As shown in fig. 3, the embodiment of the present application further provides a metal 3D printing pressure and atmosphere dynamic control method, which applies the foregoing metal 3D printing pressure and atmosphere dynamic control system 1, where the metal 3D printing pressure and atmosphere dynamic control method includes the following steps:
the pressure monitoring module detects a real-time pressure value in the forming chamber, and transmits the real-time pressure value to the central control module.
The central control module compares the real-time pressure value with a first preset pressure threshold value:
and if the central control module judges that the real-time pressure value is lower than the lower limit of the first preset pressure threshold, controlling the air inflow of the air inflow control module to be larger than the air outflow of the air outflow control module, and continuing until the central control module judges that the real-time pressure value is higher than or equal to the lower limit of the first preset pressure threshold.
And if the central control module judges that the real-time pressure value is higher than the upper limit of the first preset pressure threshold, controlling the air inflow of the air inflow control module to be smaller than the air outflow of the air outflow control module, and continuing until the central control module judges that the real-time pressure value is lower than or equal to the lower limit of the first preset pressure threshold.
And if the central control module judges that the real-time pressure value is within the first preset pressure threshold, controlling the air inflow of the air inflow control module and the air outflow of the air outflow control module to be unchanged.
The atmosphere monitoring module detects the real-time oxygen content in the forming chamber, and transmits the real-time oxygen content to the central control module.
The central control module compares the real-time oxygen content with a preset oxygen content threshold:
and if the central control module judges that the real-time oxygen content is within the preset oxygen content threshold range, controlling the air inflow of the air inflow control module and the air outflow of the air outflow control module to be unchanged.
And if the central control module judges that the real-time oxygen content is higher than the preset oxygen content threshold, controlling the air inflow of the air inflow control module to be increased, and continuing until the central control module judges that the real-time oxygen content is within the preset oxygen content threshold.
In an embodiment, the upper limit of the first preset pressure threshold is smaller than the upper limit of the pressure value of the protecting device in the forming chamber, so that the pressure release caused by triggering the protecting device is avoided, and the forming chamber is prevented from generating large-amplitude pressure fluctuation; correspondingly, the lower limit of the first preset pressure threshold is larger than the lower pressure limit of the forming chamber. The upper limit of the preset oxygen content threshold may be less than 1000ppm.
In an embodiment, the step of controlling the air inlet amount of the air inlet control module to be greater than the air outlet amount of the air outlet control module includes: controlling the flux of the adjustable air inlet valve to be increased, or controlling the flux of the adjustable air outlet valve to be reduced, or controlling the flux of the adjustable air inlet valve to be increased and simultaneously controlling the flux of the adjustable air outlet valve to be reduced; the step of controlling the air inflow of the air inflow control module to be smaller than the air outflow of the air outflow control module comprises the following steps: controlling the flux of the adjustable air inlet valve to be reduced, or controlling the flux of the adjustable air outlet valve to be increased, or controlling the flux of the adjustable air inlet valve to be reduced and simultaneously controlling the flux of the adjustable air outlet valve to be increased.
In an embodiment, the central control module records a plurality of the real-time oxygen contents in a period of continuous time, establishes a coordinate system with time as an abscissa and the real-time oxygen contents as an ordinate, records a change of the plurality of the real-time oxygen contents in the period of continuous time, establishes a linear equation, and obtains a slope of the linear equation; the central control module compares the slope with a preset oxygen change rate threshold, if the central control module judges that the slope is within the oxygen change rate threshold, the air inflow of the air inflow control module and the air outflow of the air outflow control module are controlled to be unchanged, and if the central control module judges that the slope is higher than the oxygen change rate threshold, the air inflow of the air inflow control module is controlled to be increased and the central control module continues until the central control module judges that the slope is within the oxygen change rate threshold.
Furthermore, by monitoring the change slope of the oxygen content, the air inflow and the air outflow can be timely adjusted, so that the oxygen content is effectively restrained from rising rapidly, and the oxygen content is prevented from exceeding a preset range.
In an embodiment, when the central control module determines that the real-time oxygen content is higher than the preset oxygen content threshold or the slope is higher than the oxygen change rate threshold, and the real-time pressure value is lower than the lower limit of the first preset pressure threshold, the air input of the air input control module is controlled to be increased, the air output of the air output control module is controlled to be reduced or unchanged, and the air input flux of the air input control module is controlled to be greater than the air output flux of the air output control module.
In an embodiment, when the central control module determines that the real-time oxygen content is higher than the preset oxygen content threshold or the slope is higher than the oxygen change rate threshold, and the real-time pressure value is higher than the upper limit of the first preset pressure threshold, the air intake amount of the air intake control module is controlled to be increased, the air output amount of the air output control module is controlled to be increased, and the increase of the air intake flux of the air intake control module is controlled to be smaller than the increase of the air output flux of the air output control module.
In an embodiment, when the central control module determines that the real-time oxygen content is higher than the preset oxygen content threshold or the slope is higher than the oxygen change rate threshold, and the real-time pressure value is within the first preset pressure threshold range, the air intake amount of the air intake control module is controlled to be increased, the air output amount of the air output control module is controlled to be increased, and the increase of the air intake flux of the air intake control module is controlled to be equal to the increase of the air output flux of the air output control module.
In an embodiment, when the central control module determines that the real-time oxygen content is not higher than the preset oxygen content threshold or the slope is not higher than the oxygen change rate threshold, and the real-time pressure value is within the first preset pressure threshold range, the air inflow of the air inflow control module and the air outflow of the air outflow control module are controlled to be unchanged.
According to the metal 3D printing pressure and atmosphere dynamic control method, the pressure and the oxygen content in the forming chamber are monitored in real time, the air inlet control module and the air outlet control module are adjusted in real time according to the monitoring data of the pressure monitoring module and the atmosphere monitoring module, the air inlet flux and the air outlet flux are adjusted in an adaptive mode by further combining a plurality of factors such as the pressure, the oxygen content and the oxygen content change rate, the pressure and the oxygen content in the forming chamber are always kept at a proper level (for example, positive and negative 0.2 KPa), and the printing atmosphere pressure is stable.
Hereinabove, the specific embodiments of the present application are described with reference to the accompanying drawings. However, those of ordinary skill in the art will appreciate that various modifications and substitutions can be made to the specific embodiments of the present application without departing from the scope thereof. Such modifications and substitutions are intended to be within the scope of the present application.
Claims (10)
1. A metal 3D printing pressure and atmosphere dynamic control system for adjusting atmosphere and pressure in a forming chamber, comprising:
a central control module for running a programmable control program;
the pressure monitoring module is in communication connection with the central control module and is used for monitoring the pressure in the forming chamber;
the atmosphere monitoring module is in communication connection with the central control module and is used for monitoring the oxygen content in the forming chamber;
the air inlet control module comprises an adjustable air inlet valve and an electronic flowmeter, wherein the adjustable air inlet valve and the electronic flowmeter are arranged on an air inlet channel communicated with the forming chamber, the electronic flowmeter is in communication connection with the central control module and is used for measuring the air inlet flow of the air inlet channel, the adjustable air inlet valve is in communication connection with the central control module, and the adjustable air inlet valve is used for adjusting the amount of air entering the forming chamber;
the air outlet control module comprises an adjustable air outlet valve, the adjustable air outlet valve is arranged on an air outlet channel communicated with the forming chamber, the adjustable air outlet valve is in communication connection with the central control module, and the adjustable air outlet valve is used for adjusting the amount of air discharged out of the forming chamber.
2. The metal 3D printing pressure and atmosphere dynamic control system of claim 1, further comprising an electronic pressure gauge triplet disposed in the air intake channel, the electronic pressure gauge triplet disposed upstream of the air intake control module, the electronic pressure gauge triplet in communication with the central control module, the electronic pressure gauge triplet in communication with an air source, the electronic pressure gauge triplet for monitoring the pressure of the air source.
3. The metal 3D printing pressure and atmosphere dynamic control system of claim 1, wherein the electronic flowmeter is disposed upstream of the intake passage as compared to the adjustable intake valve.
4. The metal 3D printing pressure and atmosphere dynamic control system according to claim 1, wherein the pressure monitoring module comprises a plurality of differential pressure sensors, the plurality of differential pressure sensors are arranged in the forming chamber at intervals, and the plurality of differential pressure sensors are all in communication connection with the central control module.
5. The metal 3D printing pressure and atmosphere dynamic control system of claim 1, wherein the adjustable air inlet valve and the adjustable air outlet valve are electrically operated valves.
6. A metal 3D printing pressure and atmosphere dynamic control method, characterized in that the metal 3D printing pressure and atmosphere dynamic control system according to any one of claims 1 to 5 is applied, the metal 3D printing pressure and atmosphere dynamic control method comprising the steps of:
the pressure monitoring module detects a real-time pressure value in the forming chamber, and transmits the real-time pressure value to the central control module;
the central control module compares the real-time pressure value with a first preset pressure threshold, if the central control module judges that the real-time pressure value is lower than the lower limit of the first preset pressure threshold, the central control module controls the air inlet amount of the air inlet control module to be larger than the air outlet amount of the air outlet control module and continues until the central control module judges that the real-time pressure value is higher than or equal to the lower limit of the first preset pressure threshold, if the central control module judges that the real-time pressure value is higher than the upper limit of the first preset pressure threshold, the central control module controls the air inlet amount of the air inlet control module to be smaller than the air outlet amount of the air outlet control module and continues until the central control module judges that the real-time pressure value is lower than or equal to the lower limit of the first preset pressure threshold, and if the central control module counts that the real-time pressure value is within the first preset pressure threshold, the air inlet amount of the air inlet control module and the air outlet control module are controlled to be unchanged;
the atmosphere monitoring module detects the real-time oxygen content in the forming chamber, and transmits the real-time oxygen content to the central control module;
the central control module compares the real-time oxygen content with a preset oxygen content threshold, if the central control module judges that the real-time oxygen content is within the preset oxygen content threshold, the air inflow of the air inflow control module and the air outflow of the air outflow control module are controlled to be unchanged, and if the central control module judges that the real-time oxygen content is higher than the preset oxygen content threshold, the air inflow of the air inflow control module is controlled to be increased and is continued until the central control module judges that the real-time oxygen content is within the preset oxygen content threshold.
7. The metal 3D printing pressure and atmosphere dynamic control method according to claim 6, wherein the step of controlling the air inflow of the air inflow control module to be larger than the air outflow of the air outflow control module comprises: controlling the flux of the adjustable air inlet valve to be increased, or controlling the flux of the adjustable air outlet valve to be reduced, or controlling the flux of the adjustable air inlet valve to be increased and simultaneously controlling the flux of the adjustable air outlet valve to be reduced; the step of controlling the air inflow of the air inflow control module to be smaller than the air outflow of the air outflow control module comprises the following steps: controlling the flux of the adjustable air inlet valve to be reduced, or controlling the flux of the adjustable air outlet valve to be increased, or controlling the flux of the adjustable air inlet valve to be reduced and simultaneously controlling the flux of the adjustable air outlet valve to be increased.
8. The method according to claim 6, wherein the central control module records a plurality of the real-time oxygen contents in a continuous period, establishes a coordinate system with time as an abscissa and the real-time oxygen contents as an ordinate, records a change of the plurality of the real-time oxygen contents in the continuous period, establishes a linear equation, and obtains a slope of the linear equation; the central control module compares the slope with a preset oxygen change rate threshold, if the central control module judges that the slope is within the oxygen change rate threshold, the air inflow of the air inflow control module and the air outflow of the air outflow control module are controlled to be unchanged, and if the central control module judges that the slope is higher than the oxygen change rate threshold, the air inflow of the air inflow control module is controlled to be increased and the central control module continues until the central control module judges that the slope is within the oxygen change rate threshold.
9. The method according to claim 8, wherein when the central control module determines that the real-time oxygen content is higher than the preset oxygen content threshold or the slope is higher than the oxygen change rate threshold and the real-time pressure value is lower than a lower limit of the first preset pressure threshold, the air intake amount of the air intake control module is controlled to be increased, the air output of the air output control module is controlled to be reduced or unchanged, and the air intake flux of the air intake control module is controlled to be greater than the air output of the air output control module.
10. The metal 3D printing pressure and atmosphere dynamic control method according to claim 8, wherein when the central control module determines that the real-time oxygen content is higher than the preset oxygen content threshold or the slope is higher than the oxygen change rate threshold, and the real-time pressure value is higher than the upper limit of the first preset pressure threshold, the air intake amount of the air intake control module is controlled to be increased, the air output of the air output control module is controlled to be increased, and the increase of the air intake flux of the air intake control module is controlled to be smaller than the increase of the air output flux of the air output control module.
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| CN202210670013.4A CN117270592A (en) | 2022-06-14 | 2022-06-14 | Dynamic control system and method for metal 3D printing pressure and atmosphere |
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