CN109703032B - Control method and system of 3D network printer - Google Patents
Control method and system of 3D network printer Download PDFInfo
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- CN109703032B CN109703032B CN201811653593.6A CN201811653593A CN109703032B CN 109703032 B CN109703032 B CN 109703032B CN 201811653593 A CN201811653593 A CN 201811653593A CN 109703032 B CN109703032 B CN 109703032B
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Abstract
The embodiment of the invention discloses a control method and a control system of a 3D network printer, wherein the control method comprises the following steps: the system comprises a first mobile communication terminal, a second mobile communication terminal, a server and a 3D network printer; the first mobile communication terminal is used for designing a 3D model and sending the designed 3D model to the second mobile communication terminal through the server to ask for a modification suggestion; and if the second mobile communication terminal does not have the modification suggestion, the first mobile communication terminal slices the 3D model through the server, converts the 3D model into a G code and sends the G code to the 3D network printer, and the 3D network printer prints the 3D model and returns a printing result to the first mobile communication terminal. By adopting the invention, the 3D network printer can be conveniently controlled.
Description
Technical Field
The invention relates to the electromechanical field, in particular to a control method and a control system of a 3D network printer.
Background
The 3D printing manufacturing technology is a forming manufacturing technology for stacking and solidifying special functional materials layer by layer through software and a numerical control system according to three-dimensional design and three-dimensional calculation of a computer, and manufacturing a three-dimensional object by printing a layer by layer of bonding materials. 3D printing brings a worldwide manufacturing revolution, whether the previous part design can be realized by depending on a production process or not can be realized, and the appearance of a 3D printer can subvert the production thought, so that an enterprise does not need to consider the production process problem when producing parts, the design of any complex shape can be realized by the 3D printer, and objects in any shape can be directly generated from computer graphic data without machining or a die, so that the production period of products is greatly shortened, and the production efficiency is improved. Although 3D printing can be networked, in the era of industrial internet, how to connect 3D printing with customers and designers, how to meet personalized requirements of customers, and how to directly interface related products and services with users at zero distance by means of o2o, there is no method found at present.
Disclosure of Invention
In order to solve the above problems, embodiments of the present invention provide a method and a system for controlling 3D network printing, so that a user, a designer, and a 3D printer are in zero-distance docking, thereby achieving good interconnection and intercommunication of customized products, and achieving online design, a visible printing process, and good user experience.
Based on this, the invention provides a control method and a system for 3D network printing, wherein the method comprises the following steps: a control method of a 3D network printer is characterized by comprising the following steps:
the system comprises a first mobile communication terminal, a second mobile communication terminal, a server and a 3D network printer;
the first mobile communication terminal is used for designing a 3D model and sending the designed 3D model to the second mobile communication terminal through the server to ask for a modification suggestion;
and if the second mobile communication terminal does not have the modification suggestion, the first mobile communication terminal slices the 3D model through the server, converts the 3D model into a G code and sends the G code to the 3D network printer, and the 3D network printer prints the 3D model and returns a printing result to the first mobile communication terminal.
The first mobile communication terminal is provided with model design software, slicing software and monitoring management software, the model design software is used for designing a 3D model, the slicing software is used for horizontally cutting the 3D model to obtain a plan view, and the monitoring management software is used for monitoring and managing the running state of the 3D network printer.
Wherein, the operating condition of the 3D network printer comprises: position information and speed information of an X, Y, Z axis of the 3D network printer, and speed information and temperature information of an extruder of the 3D network printer.
The X, Y, Z-axis position information of the 3D network printer is controlled by a motor driving circuit of a servo or stepping motor to realize accurate printing of a 3D model, and three axis motors of an X axis, a Y axis and a Z axis of the 3D network printer are controlled by PWM (pulse width modulation).
The extruder is controlled by a stepping motor driving circuit to realize accurate printing of the 3D model, and the extruder motor of the 3D network printer is controlled by PWM (pulse width modulation).
And the temperature control in the extruder nozzle adopts a PID algorithm, and the PID algorithm is used for controlling the temperature to be constant.
And the G code is a printing code which can be identified by the 3D network printer, so that the 3D printer executes a printing command.
Correspondingly, the invention also provides a control system of the 3D network printer, which comprises the first mobile communication terminal, the second mobile communication terminal, the server and the 3D network printer;
the first mobile communication terminal is used for designing a 3D model and sending the designed 3D model to the second mobile communication terminal through the server to ask for a modification suggestion;
the second mobile communication terminal is used for checking and accepting the 3D model sent by the first mobile communication terminal and sending the modification suggestion of the 3D model to the first mobile communication terminal;
the server is used for receiving and sending information from the first mobile communication terminal, the second mobile communication terminal and the 3D network printer;
and the 3D network printer is used for receiving a printing instruction of the first mobile communication terminal to print and returning a printing result to the first mobile communication terminal.
Wherein the printing instruction comprises cancel printing, pause printing and reprint.
The 3D model referred by the second mobile terminal comprises a main view, a top view, a left view, a right view, a bottom view and a back view of the 3D model.
By adopting the method and the system, a designer can design the 3D network model and supervise the printing state of the 3D network model through application software, a client can communicate with the designer through the application software, the client requirement is reflected, the product three-dimensional model is consulted on line, modification suggestions and opinions are provided, and the user experience is greatly improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is an interaction diagram of a 3D network printer control method according to an embodiment of the present invention;
fig. 2 is a control flowchart of a 3D network printer control method according to an embodiment of the present invention;
fig. 3 is a control flowchart of a 3D network printer according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a 3D network printer controller according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is an interaction diagram of a 3D network printer control method provided in an embodiment of the present invention, including:
the system comprises a first mobile communication terminal, a second mobile communication terminal, a server and a 3D network printer;
the first mobile communication terminal is used for designing a 3D model, the first mobile communication terminal carries out 3D model design through the installed model design software, parts are designed according to product sizes, then all the parts are assembled according to the assembly relation of the parts, the 3D model is obtained, the designed 3D model is sent to the second mobile communication terminal through the server to ask for modification opinions, if the 3D model does not meet customer requirements, a customer holding the second mobile communication terminal puts forward the modification opinions, and the first mobile communication terminal modifies the 3D model until the customer requirements are met.
And if the second mobile communication terminal does not have the modification suggestion, the first mobile communication terminal converts the 3D model into a G code after slicing through the server and sends the G code to the 3D printer, and the 3D printer prints the 3D model and returns a printing result to the first mobile communication terminal.
Fig. 2 is a control flowchart of a 3D network printer control method provided in an embodiment of the present invention, including:
s201, the first mobile communication terminal designs a 3D model.
The first mobile communication terminal comprises model design software, slicing software and monitoring management software, the first mobile communication terminal firstly designs a 3D model through the model design software, and parts are designed according to product sizes and then assembled according to the assembly relation of the parts, so that the 3D model is obtained. After the 3D model is designed, the first mobile communication terminal sends the 3D model to a server, the server is used for data processing, data storage and data communication, and the server sends the 3D model to a second mobile communication terminal.
And S202, the second mobile communication terminal refers to the 3D model.
And the second mobile communication terminal receives the 3D model, and a client holding the second mobile communication terminal refers to the 3D model.
S203, whether the second mobile communication terminal proposes the modification suggestion or not.
And if the 3D model does not meet the requirements of the client, the client holding the second mobile communication terminal puts forward a modification suggestion, and the first mobile communication terminal modifies the 3D model until the requirements of the client are met.
And S204, the first mobile communication terminal slices the 3D model, converts the 3D model into a G code and sends the G code to the 3D network printer.
And the first mobile communication terminal horizontally cuts the 3D model through the server to obtain individual plane graphs, and calculates the consumable consumption and time of the printer. And storing the information into a G code file in a unified manner, and transmitting the information to a 3D network printer to be converted into a printing code which can be recognized by the 3D network printer, so that the 3D network printer executes a printing command.
And S205, the 3D network printer prints and returns the execution result of the first mobile communication terminal.
And the 3D printer prints the 3D model and returns a printing result to the first mobile communication terminal.
The first mobile communication terminal can monitor the working state of the printer, such as monitoring the position information and speed information of an X, Y, Z shaft of the 3D network printer and the speed and temperature information of the extruder, and monitoring whether a 3D model is printed or not, if the 3D model is printed in a distorted mode and a wire is extruded by the 3D network printer and the printing is finished, the first mobile communication terminal receives an information prompt, wherein the information prompt comprises a mail and a short message, and the printing information can be checked through the printing history record of the 3D network printer.
The first mobile communication terminal sends an instruction to a control system of the 3D network printer through monitoring management software, the control system executes printing according to the instruction and returns a result to the monitoring management software of the first mobile communication terminal, and the monitoring management software judges whether reprinting is needed according to the returned result.
The devices capable of connecting with the mobile internet are collectively referred to as mobile communication terminals, such as mobile phones, PDAs, IPADs, internet enabled televisions, tablet computers, palmtop computers, and the like.
The server can be a computer, or a single network server, a server group consisting of a plurality of network servers, or a cloud consisting of a large number of hosts or network servers based on cloud computing, wherein the cloud computing is one of distributed computing and is a super virtual computer consisting of a group of loosely coupled computers.
Fig. 3 is a control flowchart of a 3D network printer control method provided in an embodiment of the present invention, including:
s301, the 3D network printer receives a printing instruction from the first mobile communication terminal.
And the 3D network printer receives the G code sent by the first mobile communication terminal and starts to print the 3D model.
S302, the 3D network printer adopts PWM (pulse width modulation) technology to control the three-axis motor X, Y, Z and the extruder motor to operate.
PWM (pulse Width modulation), a pulse Width modulation technique, is a method of digitally encoding the level of an analog signal, with the use of a high resolution counter, the duty cycle of a square wave being modulated to encode the level of a particular analog signal, but the PWM signal is still digital, since at any given time, full amplitude dc power is not completely available, or is not completely available. The voltage or current source is applied to the dummy load in a repetitive pulse train of on and off, i.e. when the dc supply is applied to the load and off, i.e. when the supply is disconnected. Any analog value can be encoded using PWM as long as the bandwidth is sufficient. In short, the speed of the motor is controlled by changing the time ratio (duty ratio) of connection and disconnection of the motor pivot (stator) voltage, and in the pulse width modulation system, when the motor is powered on, the speed is increased, and when the motor is powered off, the speed is reduced. The speed of the motor can reach and keep a stable value only by changing the on-off time according to a certain rule.
And S303, acquiring the temperature of a spray head of the 3D network printer in real time and controlling the temperature to be constant through a PID algorithm.
The method comprises the following steps of collecting the temperature of a spray head of the 3D network printer in real time and controlling the temperature to be constant by adopting a PID algorithm, wherein an expression controlled by the PID algorithm is as follows:
where KP is the proportional gain, TI is the integral time constant, TD is the derivative time constant, u (t) is the control quantity temperature, and e (t) is the deviation of the measured temperature from the given temperature.
And S304, calculating the step size.
The step size is the equivalent pulse, and the displacement of the motor moving part per pulse signal is called the equivalent pulse.
S305, calculating the printing precision.
The printing precision value is the displacement of the motor moving part of each pulse signal.
And S306, judging whether the printing precision meets the precision requirement.
And judging whether the displacement of the motor moving part of each pulse signal meets the required displacement.
And S307, if the printing precision does not meet the precision requirement, fine-tuning the step length by adopting a NURBS interpolation algorithm.
In the actual processing of the 3D model of the 3D network printer, the contour shape of the 3D model to be processed is very different, strictly speaking, in order to meet the requirement of the geometric dimension precision of the 3D model, the tool center track should be generated accurately according to the contour shape of the 3D model, which can be implemented relatively easily for a simple curve numerical control system, but for a relatively complex shape, the algorithm becomes very complex if the tool center track is generated directly, therefore, in the actual application, the precision requirement (also in the case of requiring parabolic or high-order curve fitting) can be met by fitting a small segment of straight line or circular arc, and the fitting method is "interpolation", which is actually a process of data densification.
The task of interpolation is to calculate coordinate values of a plurality of intermediate points between the starting point and the end point of the profile according to the requirement of the feeding speed, the time required for calculation of each intermediate point directly influences the control speed of the system, and the step length can be finely adjusted by adopting a NURBS interpolation algorithm.
And S308, if the printing precision meets the precision requirement, printing the 3D model.
Fig. 4 is a schematic diagram of a controller of a 3D network printer according to an embodiment of the present invention, including:
a data acquisition module 401, a temperature control module 402, a communication module 403, an extruder control module 404, a CPU module 405, a storage module 406, a holder control module 407, a power supply processing module 408, and an X, Y, Z axis position control module 409;
the data acquisition module 401, the temperature control module 402, the communication module 403, the extruder control module 404, the storage module 406, the pan-tilt control module 407, the power processing module 408, and the axis position control module 409 of X, Y, Z are all connected to the CPU module.
The data acquisition module 401 includes an analog input circuit, an analog output circuit, a digital input circuit, and a digital output circuit. The analog input circuit comprises 8 channels, the sampling precision is 12 bits, and the input type can select voltage and current. Analog quantity parameters such as the temperature of a heating bed of the 3D network printer and the temperature of the extruding machine are collected. The analog quantity output circuit comprises 4 channels, and the output type of the analog quantity output circuit can select voltage and current and is used for controlling parameters such as the temperature of the extruder. The digital quantity input circuit comprises 8 channels and collects state signals such as switching values. The digital quantity output circuit comprises 8 channels and is used for controlling the start and stop of the 3D network printer.
The temperature control module 402 is used to control the temperature inside the print head, the temperature control inside the print head not only affects the printing precision, but also affects the printing quality, the temperature can be controlled to be constant by using a PID algorithm, and the expression controlled by the PID algorithm is as follows:
where KP is the proportional gain, TI is the integral time constant, TD is the derivative time constant, u (t) is the control quantity temperature, and e (t) is the deviation of the measured temperature from the given temperature.
The communication module 403 is used for performing communication connection with an external device, and the communication module includes ethernet communication, wireless communication, and RS232/485 communication;
the Ethernet communication is communicated with the server or the mobile communication terminal, the instruction of the server is received, the state data of the 3D network printer is uploaded in real time, and an ENC28J60 interface chip is selected as an Ethernet communication interface.
The wireless communication interface such as wifi, bluetooth, loRa, NB-IOT, cell-phone etc. receives wireless terminal such as the inquiry command of cell-phone customer end to return required data to wireless terminal.
RS232/485 communication interface: and (4) a digital instrument interface, such as command control of the movement of a cradle head with an RS232/485 interface.
The extruder control module 404 is configured to control a stepping motor driving circuit of the extruder, to realize accurate printing of a printed product, and to control an extruder motor of the 3D network printer by using a PWM pulse width modulation technique.
The CPU module 405 is a core of a control system of the 3D network printer, and communicates with the server and the first mobile communication terminal through the communication module. The CPU module can be a CPU with the model of AT91RM9200, the AT91RM9200 is a high-performance and low-power consumption 16 or 32-bit RISC microprocessor developed by Atreel company based on an ARM920T core, and rich peripheral resources and peripheral interfaces are integrated inside the microprocessor. The AT91RM9200 microprocessor has the highest main frequency of 180MHz, 16KB of SRAM and 128KB of ROM, 16KB of data cache and 16KB of instruction cache, a high-level interrupt controller, 4 32-bit PIO controllers, 4 universal synchronous or asynchronous serial transceivers (UASRT) and JTAG or ICE interfaces.
The memory module 406 includes NOR FLASH memory and SDRAM memory.
The NOR FLASH memory is used for storing programs and important data required by system operation, and the programs and the data cannot be lost even if power is off. The chip used is AT49BNl614T manufactured by Atmel company to maintain compatibility with AT91RM9200, the storage capacity is 2MB, the working voltage is 3, 3V, and 56-pin TSOP packaging is adopted.
The SDRAM memory is used for storing programs and data during system operation, and the programs and the data are lost after power failure. Two pieces of SDRAM with data width of 16 bits are used and one SDRAM module with data width of 32 bits is used to fully exert the high performance of the data width of 32 bits of the microprocessor. The used chip is HY57V561620, the storage capacity is 32MB, the working voltage is 3.3V, and 54-pin TSOP packaging is adopted.
The holder control module 407 has two control modes, and is connected with an RS485 or RS232 communication interface or a digital output interface. If the cradle head is provided with an RS485 or RS232 communication interface, the cradle head is controlled in a communication mode, the first mobile communication terminal sends an information instruction to a control system of the 3D network printer through a network, the control system of the 3D network printer analyzes the instruction and sends the instruction to an RS485 or 232 serial port, the rotation of the cradle head in the up-down direction, the left-right direction and the left-right direction is controlled to adjust the angle of a photosensitive chip so that a camera can obtain the clearest video picture, the different positions of the 3D network printer are further monitored, if the cradle head is provided with a digital quantity control interface, digital quantity output control is selected, and the up-down motion, the left-right motion of the 3D network printer is monitored by the digital quantity output of 4 channels in the up-down direction, the left-right direction and the 4-left direction of the cradle head.
The power processing module 408 selects a voltage conversion chip LM2596S-5, the input voltage range of the power processing module is 12-40V, the output voltage is 5V, and the maximum output current is 3A.
A voltage conversion chip with the model number of NCPLll7ST33T3 is selected, the input voltage of the voltage conversion chip is 5V, the output voltage of the voltage conversion chip is 3.3V, and the maximum output current of the voltage conversion chip is 0.8A.
A voltage conversion chip with the model number of NCPLll7STl8T3 is selected, the input voltage of the voltage conversion chip is 5V, the output voltage of the voltage conversion chip is 1.8V, and the maximum output current of the voltage conversion chip is 0.8A.
The X, Y, Z shaft position control module 409 is used for controlling servo of three axes of an X axis, a Y axis and a Z axis or a motor driving circuit of a stepping motor, realizing accurate printing of a printed piece, and controlling the three axis motors of the X axis, the Y axis and the Z axis of the 3D printer by adopting a PWM (pulse width modulation) technology.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (9)
1. A control method of a 3D network printer is characterized by comprising the following steps:
the system comprises a first mobile communication terminal, a second mobile communication terminal, a server and a 3D network printer;
the first mobile communication terminal is used for designing a 3D model and sending the designed 3D model to the second mobile communication terminal through the server to ask for a modification suggestion; the first mobile communication terminal is provided with model design software, slicing software and monitoring management software, the model design software is used for designing a 3D model, the slicing software is used for horizontally cutting the 3D model to obtain a plan view, and the monitoring management software is used for monitoring and managing the running state of the 3D network printer; if the running state of the 3D network printer is abnormal, the 3D network printer sends an information prompt to the first mobile communication terminal, the first mobile communication terminal sends an instruction to a control system of the 3D network printer through the monitoring management software, the control system executes printing according to the instruction, and a result is returned to the monitoring management software of the first mobile communication terminal;
if the second mobile communication terminal does not have the modification suggestion, the first mobile communication terminal slices the 3D model through the server, converts the 3D model into a G code and sends the G code to the 3D network printer, and the 3D network printer prints the 3D model and returns a printing result to the first mobile communication terminal;
and the monitoring management software judges whether reprinting is needed or not according to the returned result.
2. The method for controlling a 3D network printer according to claim 1, wherein the operation status of the 3D network printer includes: position information and speed information of an X, Y, Z axis of the 3D network printer, and speed information and temperature information of an extruder of the 3D network printer.
3. The method as claimed in claim 2, wherein the X, Y, Z axis position information of the 3D network printer is controlled by a motor driving circuit of a servo or stepping motor to realize the accurate printing of the 3D model, and the three axis motors of the X axis, the Y axis and the Z axis of the 3D network printer are controlled by using PWM (pulse width modulation).
4. The method as claimed in claim 2, wherein the extruder is controlled by a step motor driving circuit to realize the accurate printing of the 3D model, and the extruder motor of the 3D network printer is controlled by PWM (pulse width modulation).
5. The method for controlling a 3D network printer according to claim 4, wherein the temperature control in the extruder head adopts PID algorithm, and the PID algorithm is used for controlling the temperature to be constant.
6. The method of claim 1, wherein the G code is a print code recognizable by the 3D network printer, and causes the 3D printer to execute the print command.
7. A control system of a 3D network printer, comprising the first mobile communication terminal, the second mobile communication terminal, the server and the 3D network printer according to claims 1 to 6;
the first mobile communication terminal is used for designing a 3D model and sending the designed 3D model to the second mobile communication terminal through the server to ask for a modification suggestion;
the second mobile communication terminal is used for checking and accepting the 3D model sent by the first mobile communication terminal and sending the modification suggestion of the 3D model to the first mobile communication terminal;
the server is used for receiving and sending information from the first mobile communication terminal, the second mobile communication terminal and the 3D network printer;
and the 3D network printer is used for receiving a printing instruction of the first mobile communication terminal to print and returning a printing result to the first mobile communication terminal.
8. The control system of the 3D network printer according to claim 7, wherein the print instruction includes cancel printing, pause printing, reprint.
9. The control system of the 3D network printer according to claim 7, wherein the 3D model referred to by the second mobile terminal includes a front view, a top view, a left view, a right view, a bottom view, and a rear view of the 3D model.
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