CN115983013A - Virtual simulation system for extrusion process of melt spinning screw - Google Patents
Virtual simulation system for extrusion process of melt spinning screw Download PDFInfo
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Abstract
The invention provides a virtual simulation system for a melt spinning screw extrusion process, which comprises the following steps: an animation module: setting parameters through the three-dimensional model, and establishing a three-dimensional dynamic virtual object of an equipment component in the extrusion process of the melt spinning screw to obtain the melt spinning screw extrusion three-dimensional model; a back-end data module: establishing mathematical models of a partial filling area, a complete filling area and a coupling interface in the extrusion process of the melt spinning screw, obtaining process indexes of the mathematical models, storing the process indexes into a real-time database and transmitting the process indexes to a data table of a front-end interaction module; a front-end interaction module: inputting input parameters; displaying the process indexes of the mathematical model through a data table; inputting three-dimensional model setting parameters; and presenting the three-dimensional animation of the melt spinning screw extrusion three-dimensional model. According to the scheme provided by the invention, the operation mode of the extrusion process of the melt spinning screw is displayed in an all-around manner through the three-dimensional dynamic visual angle, so that the operators and the students can experience the real environment of the extrusion of the melt spinning screw in an on-the-spot manner.
Description
Technical Field
The invention belongs to the field of virtual simulation of industrial processes, and particularly relates to a virtual simulation system for a melt spinning screw extrusion process.
Background
The chemical fiber spinning method mainly includes two main types of melt spinning and solution spinning according to the different properties of fiber-forming high polymers. Melt spinning is suitable for fiber-forming polymers, such as polyamide fibers, polyester fibers, and the like, which do not significantly decompose in the molten state. Compared with solution spinning, the melt spinning process is simpler, the spinning speed is higher, the spinning cost is lower, the process flow is shorter, and the recovery of a solvent and a precipitating agent is not needed, so that most of chemical fibers are produced by a melt spinning method. The method is limited by spinning equipment and control technology, a high-quality and high-quality melt spinning production line is difficult to establish in China, the spinning speed is low, and the production efficiency does not reach the standard, so that the digital intelligent transformation is required to be accelerated, and an industrial internet platform with integrated real-time data, a management information system and an application program is created.
The virtual reality technology is a computer simulation system capable of creating and experiencing a virtual world, covers computer technology, electronic information technology and simulation technology, and has the characteristics of immersion, interactivity, multi-perceptibility, imagination, autonomy and the like. With the continuous development of social productivity and scientific technology, the demand of various industries on virtual reality technology is increasingly vigorous. The virtual reality technology is applied to the extrusion process of the melt spinning screw, so that the visual understanding of an operator on the extrusion process of the melt spinning screw can be deepened, and a user can operate at will and obtain feedback which is closest to the real environment.
Disclosure of Invention
In order to solve the technical problems, the invention provides a technical scheme of a virtual simulation system for a melt spinning screw extrusion process, so as to solve the technical problems.
The invention discloses a virtual simulation system of a melt spinning screw extrusion process in a first aspect, which comprises: the system comprises an animation module, a front-end interaction module and a back-end data module;
the animation module: establishing a three-dimensional dynamic virtual object of an equipment component in the extrusion process of the melt spinning screw by adopting three-dimensional graphic modeling software and a three-dimensional visual browser engine through setting parameters of a three-dimensional model to obtain a melt spinning screw extrusion three-dimensional model; the melt spinning screw extrusion three-dimensional model is packaged into a reusable component and is nested to the front-end interaction module;
the back-end data module: establishing mathematical models of a partial filling area, a complete filling area and a coupling interface of a melt spinning screw extrusion process, inputting input parameters into the mathematical models to obtain process indexes of the mathematical models, storing the process indexes into a real-time database and transmitting the process indexes to a data table of the front-end interaction module;
the front-end interaction module: inputting the input parameters; displaying the process indexes of the mathematical model through the data table;
inputting the three-dimensional model setting parameters; and presenting the three-dimensional animation of the melt spinning screw extrusion three-dimensional model for image display.
According to the system of the first aspect of the present invention, the method for obtaining the melt spinning screw extrusion three-dimensional model by establishing the three-dimensional dynamic virtual object of the equipment component in the melt spinning screw extrusion process by setting parameters through the three-dimensional model by using the three-dimensional graphical modeling software and the three-dimensional visual browser engine comprises:
step 11: selecting all cross sections of equipment in the melt spinning screw extrusion process for model sketch, and establishing the appearance attribute of equipment components in the melt spinning screw extrusion process by adopting an equal-ratio scaling geometric configuration method;
step 12: according to a sketched model of equipment in the melt spinning screw extrusion process, a three-dimensional static model of equipment components is manufactured by combining the position layout of the equipment components in the real melt spinning screw extrusion process;
step 13: exporting the three-dimensional static model to the three-dimensional visual browser engine as a whole, and adjusting the position and the size of the three-dimensional static model in the three-dimensional visual browser engine;
step 14: writing a control program script of the three-dimensional visual browser engine, adding a camera, a grid, a light source and a renderer, importing the program script into the three-dimensional static model, and selecting a predefined light source and searching a predefined angle by adjusting the position of the camera; attaching a base material and a shader material to the three-dimensional static model according to equipment of a real melt spinning screw extrusion process;
step 15: adding a track controller and a position control function into a control program script, and setting the dependency relationship of equipment in the three-dimensional static model; parameters are set through the three-dimensional model, namely segmented display of material temperature is carried out through barrel temperature, different spinning fluid colors are displayed according to material temperature distribution of different areas, conversion from the three-dimensional static model to the three-dimensional dynamic model is completed, and the melt spinning screw extrusion three-dimensional model is obtained.
According to the system of the first aspect of the invention, the apparatus component comprises: a screw, a sleeve, a feed hopper, a spin box, a spinneret, a metering pump, a melt polymer, a spinning fluid, a thermostatic air box, an oil tanker, a godet, and a friction roller;
the method for displaying the material temperature in sections through the barrel temperature comprises the following steps:
the segmentation range of the barrel temperature is 2 segments to 8 segments, and the colors corresponding to the spinning fluid are sky blue, grass green, pink purple, rose, coffee, orange, vermilion and cooked brown respectively.
According to the system of the first aspect of the invention, the method of establishing a mathematical model of a partially filled zone, a fully filled zone, and a coupling interface of a melt spinning screw extrusion process comprises:
step 21: taking the screw pitch, the material density, the material specific heat capacity, the viscosity dissipation coefficient, the length of the screw extruder, the effective volume of the screw extruder, the exchange area between the material and the barrel body and the heat exchange coefficient between the material and the barrel body as input parameters, and taking the screw rotating speed, the barrel body temperature and the material viscosity as operation variables to establish a mass conservation equation of a partial filling area of a melt spinning screw extrusion process, an energy conservation equation of a partial filling area of the melt spinning screw extrusion process, a mass conservation equation of a complete filling area of the melt spinning screw extrusion process, an energy conservation equation of a complete filling area of the melt spinning screw extrusion process and a mass conservation equation of the whole melt area;
step 22: and obtaining a mathematical model capable of outputting process indexes by solving a mass conservation equation of a partial filling area of the melt spinning screw extrusion process, an energy conservation equation of a partial filling area of the melt spinning screw extrusion process, a mass conservation equation of a complete filling area of the melt spinning screw extrusion process, an energy conservation equation of a complete filling area of the melt spinning screw extrusion process and a mass conservation equation of the whole melt area, wherein the process indexes comprise a filling rate, a material temperature of the partial filling area, a material temperature of the complete filling area, a length of the complete filling area and an outlet pressure.
According to the system of the first aspect of the present invention, the mathematical model of the output fill rate is:
wherein z is the screw extruder spatial distribution variable, F in For feed rate, ρ is the material density, V eff Effective volume of screw extruder, N e Is the screw speed, f pe (z) is a filling rate.
According to the system of the first aspect of the present invention, the mathematical model of the output complete fill zone length is:
wherein L is the length of the screw extruder, B is the pressure flow coefficient, k d Constants for describing the geometry of the mould, /) e Is the complete fill zone length.
According to the system of the first aspect of the invention, the mathematical models of the output partial-fill zone material temperature and the full-fill zone material temperature are:
wherein, a 1 、a 2 、r 1 、r 2 、r 3 And r 4 Is a model coefficient, T pe (z) is the partial fill zone material temperature, T fe (z) is the complete fill zone material temperature.
According to the system of the first aspect of the invention, the mathematical model of the output outlet pressure is:
wherein t is time, eta is material viscosity, rho is material density, and V eff Is the effective volume of the screw extruder, N is the screw rotation speed, L is the screw extruder length, L (t) is the complete filling zone length, B is the pressure flow coefficient, k d Constants that describe the geometric characteristics of the mold.
In a second aspect the invention provides an electronic device comprising a memory and a processor, said memory having stored thereon a computer program which, when executed by said processor, performs a method in a virtual simulation system of a melt spinning screw extrusion process as described in the first aspect of the invention.
A third aspect of the invention provides a storage medium storing a computer program executable by one or more processors for implementing a method in a virtual simulation system of a melt spinning screw extrusion process as described in the first aspect of the invention.
Therefore, the scheme provided by the invention can simulate and reproduce the melt spinning screw extrusion process flow, shows the operation mode of the melt spinning screw extrusion process in an all-around manner through a three-dimensional dynamic visual angle, has high verisimilitude, real-time performance and interchangeability, and enables operators to experience the real environment of the melt spinning screw extrusion in an on-the-spot manner. The cognition of operators on the actual melt spinning production process and the environment is improved by applying a digital technology and a computer technology. Meanwhile, the virtual simulation system can also be used for experimental teaching in colleges and universities, and is beneficial to improving teaching efficiency, reducing teaching cost and improving teaching safety.
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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, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a block diagram of a virtual simulation system for a melt spinning screw extrusion process according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an implementation of a virtual simulation system of a melt spinning screw extrusion process according to an embodiment of the present invention
FIG. 3 is a schematic view of a melt spinning screw extrusion process according to an embodiment of the present invention;
fig. 4 is a block diagram of an electronic device according to an embodiment of the present invention.
In the figure, 1 is a screw extruder and 2 is a feed inlet.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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.
The first aspect of the present invention discloses a virtual simulation system for a melt spinning screw extrusion process, fig. 1 is a structural diagram of a virtual simulation system for a melt spinning screw extrusion process according to an embodiment of the present invention, and fig. 3 illustrates a melt spinning screw extrusion process flow including a screw extruder 1 and a feed inlet 2, specifically as shown in fig. 1, the system includes: the system comprises an animation module, a front-end interaction module and a back-end data module;
the animation module: establishing a three-dimensional dynamic virtual object of an equipment component in the extrusion process of the melt spinning screw by adopting three-dimensional graphic modeling software and a three-dimensional visual browser engine through setting parameters of a three-dimensional model to obtain a melt spinning screw extrusion three-dimensional model; the melt spinning screw extrusion three-dimensional model is packaged into a reusable component and is nested to the front-end interaction module;
the back-end data module: establishing mathematical models of a partial filling area, a complete filling area and a coupling interface of a melt spinning screw extrusion process, inputting input parameters into the mathematical models to obtain process indexes of the mathematical models, storing the process indexes into a real-time database and transmitting the process indexes to a data table of the front-end interaction module;
a front-end interaction module: inputting the input parameters; displaying the process indexes of the mathematical model through the data table;
inputting the three-dimensional model setting parameters; and presenting the three-dimensional animation of the melt spinning screw extrusion three-dimensional model for image display.
In some embodiments, the method for establishing a three-dimensional dynamic virtual object of an equipment component of a melt spinning screw extrusion process by setting parameters through a three-dimensional model by using three-dimensional graphic modeling software and a three-dimensional visual browser engine to obtain the melt spinning screw extrusion three-dimensional model comprises the following steps:
step 11: selecting all cross sections of equipment in the melt spinning screw extrusion process for model sketch, and establishing the appearance attribute of equipment components in the melt spinning screw extrusion process by adopting an equal-ratio scaling geometric configuration method;
step 12: according to a sketched model of equipment in the melt spinning screw extrusion process, a three-dimensional static model of equipment components is manufactured by combining the position layout of the equipment components in the real melt spinning screw extrusion process;
step 13: exporting the three-dimensional static model to the three-dimensional visual browser engine as a whole, and adjusting the position and the size of the three-dimensional static model in the three-dimensional visual browser engine; the left mouse button controls the three-dimensional static model to move, the mouse roller controls the three-dimensional static model to zoom, and the right mouse button controls the three-dimensional static model to rotate;
step 14: writing a control program script of the three-dimensional visual browser engine, adding a camera, a grid, a light source and a renderer, importing the program script into the three-dimensional static model, and selecting a predefined light source and searching a predefined angle by adjusting the position of the camera; attaching a base material and a shader material to the three-dimensional static model according to equipment of a real melt spinning screw extrusion process;
step 15: adding a track controller and a position control function into a control program script, and setting the dependency relationship of equipment in the three-dimensional static model; and setting parameters through the three-dimensional model, namely performing segmented display on the material temperature through the barrel temperature, displaying different spinning fluid colors according to the material temperature distribution of different areas, completing the conversion from the three-dimensional static model to the three-dimensional dynamic model, and obtaining the melt spinning screw extrusion three-dimensional model.
The apparatus components include: a screw, a sleeve, a feed hopper, a spin box, a spinneret, a metering pump, a melt polymer, a spinning fluid, a thermostatic air box, an oil tanker, a godet, and a friction roller;
the method for displaying the material temperature in sections through the barrel temperature comprises the following steps:
the segmented range of the barrel temperature is 2 to 8 segments, and the colors corresponding to the spinning fluid are sky blue, grass green, pink purple, rose, coffee, orange, vermilion and cooked brown respectively.
In some embodiments, the method of creating a mathematical model of a partially filled region, a fully filled region, and a coupling interface of a melt spinning screw extrusion process comprises:
step 21: taking the screw pitch, the material density, the material specific heat capacity, the viscosity dissipation coefficient, the length of the screw extruder, the effective volume of the screw extruder, the exchange area between the material and the barrel body and the heat exchange coefficient between the material and the barrel body as input parameters, and taking the screw rotating speed, the barrel body temperature and the material viscosity as operation variables to establish a mass conservation equation of a partial filling area of a melt spinning screw extrusion process, an energy conservation equation of a partial filling area of the melt spinning screw extrusion process, a mass conservation equation of a complete filling area of the melt spinning screw extrusion process, an energy conservation equation of a complete filling area of the melt spinning screw extrusion process and a mass conservation equation of the whole melt area;
step 22: and obtaining a mathematical model capable of outputting process indexes, namely filling rate, material temperature of the partial filling area, material temperature of the complete filling area, length of the complete filling area and outlet pressure, by solving a mass conservation equation of the partial filling area in the melt spinning screw extrusion process, an energy conservation equation of the partial filling area in the melt spinning screw extrusion process, a mass conservation equation of the complete filling area in the melt spinning screw extrusion process, an energy conservation equation of the complete filling area in the melt spinning screw extrusion process and a mass conservation equation of the whole melt area.
The mathematical model of the output filling rate is as follows:
wherein z is the screw extruder spatial distribution variable, F in For feed rate, ρ is the material density, V eff Effective volume of screw extruder, N e Is the screw speed, f pe (z) is a filling rate.
The mathematical model of the output complete fill zone length is:
wherein L is the length of the screw extruder, B is the pressure flow coefficient, k d Constants for describing geometric characteristics of die，l e Is the complete fill zone length.
The mathematical models of the material temperature of the output part filling area and the material temperature of the complete filling area are as follows:
wherein, a 1 、a 2 、r 1 、r 2 、r 3 And r 4 Is a model coefficient, T pe (z) is the partial fill zone material temperature, T fe (z) is the complete fill zone material temperature.
The mathematical model of the outlet pressure is:
wherein t is time, eta is material viscosity, rho is material density, and V eff Is the effective volume of the screw extruder, N is the screw rotation speed, L is the screw extruder length, L (t) is the complete filling zone length, B is the pressure flow coefficient, k d Constants that describe the geometric characteristics of the mold.
In some embodiments, the front-end interaction module comprises a user information presentation page, a user information editing page, a simulation parameter input page, a result data table presentation page, a result data image presentation page, and a three-dimensional animation presentation page.
In a parameter page of the front-end interaction module, when the input parameters are null or non-numeric types, a simulation request cannot be submitted, and meanwhile, a text warning is popped up as feedback; if no warning exists, a network request is initiated, and all input parameters are stored in a real-time database.
In a page displayed by the data table, the data table is final stable data except the last column of data, the last column of data is presented in an attachment form, the attachment can be downloaded by clicking, and the content of the attachment is a stable process of corresponding result data.
In some embodiments, the front-end interaction module further comprises: the data image display page has a browser size self-adaption function through the change process of the indexes of the drawing process of the two-dimensional line graph and the three-dimensional curved surface graph.
Example 1:
a virtual simulation system of a melt spinning screw extrusion process, as shown in fig. 1 and 2, the system comprising: the system comprises an animation module, a front-end interaction module and a back-end data module;
the animation module: establishing a three-dimensional dynamic virtual object of an equipment component in the extrusion process of the melt spinning screw by adopting three-dimensional graphic modeling software and a three-dimensional visual browser engine through setting parameters of a three-dimensional model to obtain a melt spinning screw extrusion three-dimensional model; the melt spinning screw extrusion three-dimensional model is packaged into a reusable component and is nested to the front-end interaction module;
the back-end data module: establishing mathematical models of a partial filling area, a complete filling area and a coupling interface of the melt spinning screw extrusion process, inputting input parameters into the mathematical models to obtain process indexes of the mathematical models, storing the process indexes into a real-time database and transmitting the process indexes to a data table of the front-end interaction module and a melt spinning screw extrusion three-dimensional model;
a front-end interaction module: inputting the input parameters; displaying the process indexes of the mathematical model through the data table;
inputting the three-dimensional model setting parameters; and presenting the three-dimensional animation of the melt spinning screw extrusion three-dimensional model for image display.
The method for establishing the mathematical models of the partial filling area, the complete filling area and the coupling interface of the melt spinning screw extrusion process comprises the following steps:
step S101: selecting all cross sections of equipment for establishing a melt spinning screw extrusion process in industrial production to carry out model sketch, and establishing the appearance attributes of length, width, height, diameter and the like of equipment components in the melt spinning screw extrusion process by adopting an equal-ratio scaling geometric configuration method;
step 102: carrying out three-dimensional modeling by means of a blend three-dimensional graphic image software; on the basis of a sketch design drawing, adding basic objects such as cubes, cylinders, rings, cones, longitude and latitude balls, planes, path curves and the like in the blender software, and making the added basic objects into equipment parts of a preliminarily molded melt spinning screw extrusion process by using operations such as moving, zooming, rotating, circular cutting, interpolating, chamfering, perspective, circulating edges and the like to obtain a three-dimensional static model;
step 103: in the editing mode, optimizing points, lines and surfaces, adding cutting lines, extruding each surface, and modifying the bending degree of the joint of the cylinder;
step 104: manufacturing a spinning melt flow effect; newly building a cube, changing the texture into a wire frame, newly building a longitude and latitude ball, placing the longitude and latitude ball in the cube, adding fluid attributes to the cube, wherein the type is a domain, the type of the domain is liquid, and selecting the liquid and a grid, wherein the cube is solid at the moment and needs to be converted into the wire frame again; adding fluid properties to the longitude and latitude balls, wherein the type is flow, and the type of the fluid is liquid;
step 105: making into filament effect; newly building a path curve, increasing the number of curve segmentation points in an editing mode, changing the length of the curve by moving the positions of the head segmentation point and the tail segmentation point, and adjusting the bending degree of the curve by moving the positions of the rest segmentation points to wind part of the curve on a cylinder;
step 106: adjusting material parameters of the three-dimensional static model; adjusting the degree of metallization, high light intensity and roughness of each model part according to the real production environment, wherein the degree of metallization, high light intensity and roughness correspond to each other from 0 to 1, and the IOR refractive index and the spontaneous light intensity are finely adjusted;
step 107: leading out all the melt spinning equipment models which are manufactured into a three-dimensional visual browser engine in a glb format;
step 108: initializing a three-dimensional browser engine; importing a model file in a gbl format through a loader, creating a camera, a scene, a renderer and a coordinate axis, and adding a parallel light source and a point light source;
step 109: controlling the melt flow speed and the winding speed of a godet; creating control variables for movement and rotation in a three-dimensional scene in a three-dimensional visual browser engine program script, introducing a track control, associating the created control variables, and setting an adjusting range of control parameters;
step 110: performing segmented display of the material temperature through barrel temperature, wherein the segmented range is 2 to 8 segments, and the corresponding colors of the spinning fluid are sky blue, grass green, pink, rose, coffee, orange, vermilion and cooked brown respectively;
step 111: adjusting the position of the camera to realize the lens tracking effect; creating a track construction function in a three-dimensional visual browser engine program script to control a camera track, zooming out and zooming in a lens through maxZoom and minZoom attributes, and re-formulating a camera shooting central point in a rendering function to adjust a deflection angle after modifying the position of the camera;
step 112: and packaging the melt spinning screw extrusion three-dimensional model into a reusable component, applying the reusable component to page display of a front-end interaction module, and completing a self-adaptive function according to the size of a browser window.
The method for establishing the mathematical models of the partial filling area, the complete filling area and the coupling interface of the melt spinning screw extrusion process comprises the following steps:
step 201: setting the screw pitch to xi and 0.023m, the rotating speed of the screw to N, the range of 500 rpm-1100 rpm, and the transient filling rate to f p Transient material temperature of T p Barrel temperature of T b (x) The material viscosity is eta, the material density is rho, and the setting is 900kg/m 3 The specific heat capacity of the material is c p Set to 1860J/kgK and a viscous dissipation factor of μ p Is set to be 1.1 × 10 -4 Effective volume of extruder V eff Is set to be 1.7537 × 10 -7 m 3 The exchange area of the material and the barrel body is S ech Is set to be 1 × 10 -3 m 2 The heat exchange coefficient of the material and the barrel body is alpha, and the range is 200J/m 2 sK～800J/m 2 sK, the mass conservation equation for the partially filled section of the melt spinning screw extrusion process is as follows:
the energy conservation equation for the partially filled zone of the melt spinning screw extrusion process is as follows:
step 202: let the pressure of the inner outlet of the complete filling area be p, and the material flow at the outlet of the die be F d The pressure difference is Δ p, Δ p = p (L, t) -p 0 The pressure flow coefficient is B, the range is 3.77 multiplied by 10 -14 m 4 ～3.77×10 -10 m 4 The constant describing the geometric characteristics of the mold is k d In the range of 3.9843X 10 -11 m 3 ～6.9843×10 -11 m 3 The specific heat capacity of the material is c f Set to 1860J/kgK, the mass conservation equation for the fully filled section of the melt spinning screw extrusion process is as follows:
the energy conservation equation for the fully filled zone of the melt spinning screw extrusion process is as follows:
step 203: let t be the time, the effective surface area of the screw extruder is S eff Is set to be 7.62 multiplied by 10 -6 m 2 In the hot melting extrusion process, the coupling interface between the partial filling area and the complete filling area moves, the length l (t) of the complete filling area changes along with time, and the change can be described by the mass conservation equation of the whole melt area of the melt spinning screw extrusion process:
step 204: assuming that the temperature between the partially filled zone and the fully filled zone is continuous during extrusion of the melt spinning screw, the fill rate at the inlet is directly proportional to the feed rate; for convenience of processing, the moving boundary is converted into a fixed boundary, and coordinate changes are introduced as follows:
step 205: let the derivatives of the state variables in the mass conservation equation and the energy conservation equation with respect to time be 0, the data model is obtained as follows:
wherein f is pe (z) is filling factor,/ e For complete filling of zone length, T pe (z) is the partial fill zone material temperature, T fe (z) is the temperature of the material in the complete filling zone, z is the variable of the spatial distribution of the screw extruder, the range is 0-2, L is the length of the screw extruder, the length is set to be 1.05m, F in To enter intoThe material rate is set to be 1.5kg/h, rho is the material density and is set to be 900kg/m 3 ，N e The screw rotation speed is in the range of 500-1100rpm d Constants for describing geometric characteristics of the mold, ranging from 3.9843X 10 -11 m 3 ～6.9843×10 -11 m 3 B is a pressure flow coefficient in the range of 3.77 x 10 -14 m 4 ～3.77×10 -10 m 4 ，V eff Is the effective volume of the screw extruder and is set to be 1.7537 multiplied by 10 -7 m 3 ，a 1 、a 2 、r 1 、r 2 、r 3 、r 4 Are model coefficients, are set to a 1 ＝-47,a 2 ＝-2.09×10 6 ,r 1 ＝3.705,r 2 ＝1.26×10 3 ,r 3 ＝11.694,r 4 ＝5.53×10 3 ；
Step 206: selecting a relational database MySQL as a storage information base, and a non-relational database Redis as a cache database; the input parameters input from the front-end interaction module are sent to the back end through network connection and stored in a MySQL database;
step 207: reading data from the MySQL database, substituting the data into the data model to obtain calculation results of process indexes such as filling rate, material temperature, length of a complete filling area, outlet pressure and the like, and storing the process indexes into the MySQL database;
step 208: and returning the process indexes in the MySQL database to a data table at the front end in the form of an application programming interface, and displaying the page in a corresponding form.
The front-end interaction module comprises a user login page, a user information display page, a user information editing page, a three-dimensional model setting parameter and input parameter input page, a data table display page, a process index image display page and a three-dimensional animation display page; the method comprises the following implementation steps:
step 301: a user inputs a user name, a password and an authentication code on a login page, the user name and the password have length and format limitations, and the front end verifies whether the input data is empty and whether the input data conforms to rules in a form verification mode; after the verification is passed, encrypting the user password, sending the user password to a back-end server for user authentication, if the authentication is passed, navigating to a platform homepage by using a programmed route, otherwise, not performing page skipping, and prompting that the login is failed by a popup window;
step 302: setting a screw pitch, material density, material specific heat capacity, viscosity dissipation coefficient, screw extruder length, effective volume of the screw extruder, exchange area of the material and a barrel body, heat exchange coefficient of the material and the barrel body, screw rotating speed, barrel temperature and material viscosity as required items on a three-dimensional model setting parameter and input parameter input page, initiating a network request after form verification is passed, and transmitting the input parameters to a rear-end data module;
step 303: the process indexes returned from the back end are displayed to a front end page in a tabular form through a table component in a UI component library, the data table is final stable data except the last column of data, the last column of data is presented in an attachment form, the attachment can be downloaded by clicking, and the attachment content is a stable process of corresponding result data;
step 304: drawing a result data image through a data visualization chart library ECharts, and displaying the process indexes returned by the back end to a front end page in the forms of a broken line chart, a histogram and a pie chart;
step 305: introducing a reusable component of the melt spinning screw extrusion three-dimensional model into a program script of a front-end interaction module, and displaying a single page; the internationalization of the front-end language is realized by globally configuring the language dependent items, and the Chinese and English switching can be completed by one key.
In summary, the technical solutions of the aspects of the present invention have the following advantages compared with the prior art: the melt spinning screw extrusion process flow can be simulated and reproduced, the operation mode of the melt spinning screw extrusion process is comprehensively displayed through a three-dimensional dynamic visual angle, and the method has high verisimilitude, instantaneity and interactivity, so that an operator can experience the real environment of melt spinning screw extrusion in an on-the-spot manner. The cognition of operators on the actual melt spinning production process and the environment is improved by applying a digital technology and a computer technology. Meanwhile, the virtual simulation system can also be used for experimental teaching in colleges and universities, and is beneficial to improving teaching efficiency, reducing teaching cost and improving teaching safety.
The second aspect of the invention discloses an electronic device, which comprises a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to realize the steps of the method in the virtual simulation system of the melt spinning screw extrusion process in any one of the first aspect of the invention.
Fig. 4 is a block diagram of an electronic device according to an embodiment of the present invention, and as shown in fig. 4, the electronic device includes a processor, a memory, a communication interface, a display screen, and an input device, which are connected by a system bus. Wherein the processor of the electronic device is configured to provide computing and control capabilities. The memory of the electronic equipment comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The communication interface of the electronic device is used for carrying out wired or wireless communication with an external terminal, and the wireless communication can be realized through WIFI, an operator network, near Field Communication (NFC) or other technologies. The display screen of the electronic equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the electronic equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the electronic equipment, an external keyboard, a touch pad or a mouse and the like.
It will be understood by those skilled in the art that the structure shown in fig. 4 is only a partial block diagram related to the technical solution of the present disclosure, and does not constitute a limitation of the electronic device to which the solution of the present application is applied, and a specific electronic device may include more or less components than those shown in the drawings, or combine some components, or have a different arrangement of components.
In a third aspect, the present invention discloses a storage medium, in particular a computer readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the steps of the method in the virtual simulation system of the melt spinning screw extrusion process of any one of the first aspects of the present invention.
It should be noted that the technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, however, as long as there is no contradiction between the combinations of the technical features, the scope of the present description should be considered. The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A virtual simulation system for a melt spinning screw extrusion process, the system comprising: the system comprises an animation module, a front-end interaction module and a back-end data module;
the animation module: establishing a three-dimensional dynamic virtual object of an equipment component in the extrusion process of the melt spinning screw by adopting three-dimensional graphic modeling software and a three-dimensional visual browser engine through setting parameters of a three-dimensional model to obtain a melt spinning screw extrusion three-dimensional model; the melt spinning screw extrusion three-dimensional model is packaged into a reusable component and is nested to the front-end interaction module;
the back-end data module: establishing mathematical models of a partial filling area, a complete filling area and a coupling interface of a melt spinning screw extrusion process, inputting input parameters into the mathematical models to obtain process indexes of the mathematical models, storing the process indexes into a real-time database and transmitting the process indexes to a data table of the front-end interaction module;
the front-end interaction module: inputting the input parameters; displaying the process indexes of the mathematical model through the data table;
inputting the three-dimensional model setting parameters; and presenting the three-dimensional animation of the melt spinning screw extrusion three-dimensional model for image display.
2. The virtual simulation system of the extrusion process of the melt spinning screw according to claim 1, wherein the method for establishing the three-dimensional dynamic virtual object of the equipment component of the extrusion process of the melt spinning screw by setting parameters through the three-dimensional model by using the three-dimensional graphic modeling software and the three-dimensional visual browser engine to obtain the three-dimensional model of the extrusion process of the melt spinning screw comprises the following steps:
step 11: selecting all cross sections of equipment in the melt spinning screw extrusion process for model sketch, and establishing the appearance attribute of equipment components in the melt spinning screw extrusion process by adopting an equal-ratio scaling geometric configuration method;
step 12: according to a sketched model of equipment in the melt spinning screw extrusion process, a three-dimensional static model of equipment components is manufactured by combining the position layout of the equipment components in the real melt spinning screw extrusion process;
step 13: exporting the three-dimensional static model to the three-dimensional visual browser engine as a whole, and adjusting the position and the size of the three-dimensional static model in the three-dimensional visual browser engine;
step 14: writing a control program script of the three-dimensional visual browser engine, adding a camera, a grid, a light source and a renderer, importing the program script into the three-dimensional static model, and selecting a predefined light source and searching a predefined angle by adjusting the position of the camera; attaching a base material and a shader material to the three-dimensional static model according to equipment of a real melt spinning screw extrusion process;
step 15: adding a track controller and a position control function into a control program script, and setting the dependency relationship of equipment in the three-dimensional static model; parameters are set through the three-dimensional model, namely segmented display of material temperature is carried out through barrel temperature, different spinning fluid colors are displayed according to material temperature distribution of different areas, conversion from the three-dimensional static model to the three-dimensional dynamic model is completed, and the melt spinning screw extrusion three-dimensional model is obtained.
3. The virtual simulation system of a melt spinning screw extrusion process of claim 2, wherein said equipment components comprise: a screw, a sleeve, a feed hopper, a spin box, a spinneret, a metering pump, a melt polymer, a spinning fluid, a thermostatic air box, an oil tanker, a godet, and a friction roller;
the method for displaying the material temperature in sections through the barrel temperature comprises the following steps:
the segmentation range of the barrel temperature is 2 segments to 8 segments, and the colors corresponding to the spinning fluid are sky blue, grass green, pink purple, rose, coffee, orange, vermilion and cooked brown respectively.
4. The virtual simulation system of the melt spinning screw extrusion process of claim 1, wherein the method of establishing mathematical models of the partially filled region, the fully filled region, and the coupling interface of the melt spinning screw extrusion process comprises:
step 21: taking the screw pitch, the material density, the material specific heat capacity, the viscosity dissipation coefficient, the length of the screw extruder, the effective volume of the screw extruder, the exchange area between the material and the barrel body and the heat exchange coefficient between the material and the barrel body as input parameters, and taking the screw rotating speed, the barrel body temperature and the material viscosity as operation variables to establish a mass conservation equation of a partial filling area of a melt spinning screw extrusion process, an energy conservation equation of a partial filling area of the melt spinning screw extrusion process, a mass conservation equation of a complete filling area of the melt spinning screw extrusion process, an energy conservation equation of a complete filling area of the melt spinning screw extrusion process and a mass conservation equation of the whole melt area;
step 22: and obtaining a mathematical model capable of outputting process indexes by solving a mass conservation equation of a partial filling area of the melt spinning screw extrusion process, an energy conservation equation of a partial filling area of the melt spinning screw extrusion process, a mass conservation equation of a complete filling area of the melt spinning screw extrusion process, an energy conservation equation of a complete filling area of the melt spinning screw extrusion process and a mass conservation equation of the whole melt area, wherein the process indexes comprise a filling rate, a material temperature of the partial filling area, a material temperature of the complete filling area, a length of the complete filling area and an outlet pressure.
5. The virtual simulation system of the extrusion process of the melt spinning screw according to claim 4, wherein the mathematical model of the output filling rate is:
wherein z is the screw extruder spatial distribution variable, F in For feed rate, ρ is the material density, V eff Effective volume of screw extruder, N e Is the screw speed, f pe (z) is a filling rate.
6. The virtual simulation system of the extrusion process of the melt spinning screw of claim 5, wherein the mathematical model of the output complete fill zone length is:
wherein L is the length of the screw extruder, B is the pressure flow coefficient, k d Constants for describing the geometry of the mould, /) e Is the complete fill zone length.
7. The virtual simulation system of the extrusion process of the melt spinning screw according to claim 6, wherein the mathematical models of the output partial filling zone material temperature and the full filling zone material temperature are:
wherein, a 1 、a 2 、r 1 、r 2 、r 3 And r 4 Is a model coefficient, T pe (z) is the partial fill zone material temperature, T fe (z) is the complete fill zone material temperature.
8. The virtual simulation system of the extrusion process of the melt spinning screw of claim 7, wherein the mathematical model of the output outlet pressure is:
wherein t is time, eta is material viscosity, rho is material density, and V eff Is the effective volume of the screw extruder, N is the screw rotation speed, L is the screw extruder length, L (t) is the complete filling zone length, B is the pressure flow coefficient, k d Constants that describe the geometric characteristics of the mold.
9. An electronic device comprising a memory and a processor, said memory having stored thereon a computer program which, when executed by said processor, performs a method in a virtual simulation system of a melt spinning screw extrusion process according to any of claims 1 to 8.
10. A storage medium storing a computer program executable by one or more processors for implementing a method in a virtual simulation system of a melt spinning screw extrusion process as claimed in any one of claims 1 to 8.
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| CN202310009625.3A CN115983013A (en) | 2023-01-04 | 2023-01-04 | Virtual simulation system for extrusion process of melt spinning screw |
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| CN202310009625.3A CN115983013A (en) | 2023-01-04 | 2023-01-04 | Virtual simulation system for extrusion process of melt spinning screw |
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