Database for simulation of calendering of the hott

2022-08-17
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Plastic film calendering simulation database

molding processing and equipment plastic film calendering due to the low market demand, the database of simulation and Simulation of plastic film calendering is Huang Miao by Wang Kai and Zhang Yunqing (School of materials, South China University of technology, Guangzhou 510641). This paper introduces the database for plastic calendering simulation. The database is designed with access system software, and the connection between the database and the simulation system is realized with visaulbasic6.0. The established database provides the necessary data parameters for the operation of the plastic calendering simulation system, and prepares a large amount of data for the intelligent function of the system, so that the system can automatically evaluate the product quality of the simulation calendering process and the advantages and disadvantages of the operator's simulation operation. The simulation of plastic calendering process mainly focuses on information needs and takes into account processing needs. For this system, the main functions of the database are as follows: to realize the user's access to the rolling data, and can select or count the rolling data according to the user's requirements, and generate relevant statistical reports; Provide real-time data call for other modules of the system; Provide data support for the intelligent function of the simulation system. In the implementation method, access system software is used as the development tool of database design, and various basic parameter tables are established to complete data retrieval, query and other operations; Visaulbasic6.0 is used to design the interface and connect the system and database, realize the transfer and transfer of parameters between modules, and analyze, judge and process the feedback data of the actual test results. 2 basic parameter table of the database 21 calendering data table according to the calendering parameters determined by the database, ten calendering data tables are established on the basis of the relational database model, and each table contains a set of operating parameters of related processing processes. They are: (1) characteristic parameter table of materials; (2) Common values of film thickness; (3) Common values of film width; (4) Table of common values of output; (5) Parameter table of extrusion equipment; (6) Table of extrusion process parameters; (7) Table of basic parameters of roller; (8) Roller structure parameter table; (9) Parameter table of calendering equipment; (10) Calendering process parameter table. In addition, there are also user login form and internship management form. The former records the user name and access rights that are allowed to access, and the latter records the operation results of the intern. 2.2 the relationship between the calendering data sheets and the impact resistance have been improved by 10% ⑵ 0% is 22.1. When the system is initialized, use the data sheet. Before the system runs, query and retrieve the calendering parameter sheets according to the production requirements put forward by the user, help the user select the equipment of the calendering connecting line, and initialize and assign the relevant parameters of each module in this process. The specific process is as follows: Based on the characteristic parameter table of the material, the common value table of film thickness, the common value table of film width and the common value table of output, the user determines the input values, in which "output" and "material name" are the main indexes, and thus two parallel data flows are generated: one is the data flow determined by the product; One is the data flow determined by the material. In the data flow determined by the product, the system first determines the model of the calender according to the "* mass production", "film thickness" and "film width" entered by the user and the calender parameter table; Then, according to the roller specification of the selected calender, query the calender roller basic parameter table and roller structure parameter table, and transmit the selected calender equipment parameter values to the roller deflection compensation module of the mathematical model, in which the "shear elastic modulus", "elastic modulus" in the roller basic parameter table and the "number and diameter of roller boreholes", "central radius of roller boreholes" in the roller structure parameter table "Diameter of the inner hole of the roller" is used for the strength calibration of the roller, "specification of the calendering roller", "length of the working surface of the roller" and "weight of the roller" are used for the calculation of the deflection of the roller* Later, with the continuous development of polyurethane waterproof coating technology, the matching feed extruder is selected according to the production capacity of calender and the parameter table of extrusion equipment. In the data flow determined by the material, the system selects the roll temperature, roller speed, traction speed, extruder section temperature, screw speed and other process parameters of the calender according to the parameter table entered by the user, and transmits the fluid coefficient n and consistency K of the selected material to the rheological calculation module ± block of the mathematical model as the calculation basis. Therefore, the physical parameter value adopts the non-stop selection window according to the specific value under the given conditions, as shown in yed The simulation system enters the operation stage after confirming the above operating parameters. The relationship between calendering data sheets is shown in. The relationship between the basic structure parameters, constitutive parameters, parameter tables, data tables and data tables of the extrusion roll out drum 2.2 the data table is used during the system operation. During the system operation, the lateral pressure, power, temperature, roll distance and other operating factors selected by the user are obtained according to the mathematical model, which is compared with the * good process conditions obtained according to the data base (extrusion process parameter table, calendering process parameter table), It can get the product quality report under the process conditions set by the user, and make suggestions and predictions on the results of the simulation operation. Before the user exits, the system records the number of wrong operations and the rationality of the operation in the simulation system through the internship management table, and gives the evaluation of the advantages and disadvantages of the calendering operation of the operator. 23 the data required by the data acquisition and processing system can be divided into three categories: physical parameters, mechanical parameters and process parameters of polymers. They are collected from authoritative manuals or textbooks at home and abroad, and after data reliability evaluation and consistency processing, they decide whether to enter the data into the database. For the physical property parameters of polymers, in addition to inputting a large number of characteristic parameters of materials under various conditions, because it is impossible to measure the regression coefficient under any conditions by regression analysis method, so as to predict the physical property data under any conditions in a certain range. At the same time, for the convenience of calculation and management, all data and mathematical models are unified in international units. 3 interface design of database maintenance 3.1 user login when clicking the "database management" button on the main screen of the system, the dialog box of "user login" pops up, as shown in. Only when the "user name" and "password" are the same as the records in the user login form (visible only to super users), can the system allow access. The main form of user login 2 is designed as an MDI form, and the upper end of the form is a menu bar similar to the windows interface, with the options of "internship management", "extension" and "return" ". click any option to get the drop-down menu of the corresponding data table, as shown in. The form displaying each calendering data table is the sub form of the MDI form. In the sub form, click different keys to add, modify and delete the current table respectively. In the internship management table, there are also query and sorting functions. 3 calendering parameter selection here, you must select or enter a series of parameters related to calendering operation, including It includes "product and output", "calender type and parameters" and direct selection in the library, some of which require user input. After inputting the operating parameters, it means that furniture materials click the "OK" button in different environments. Can enter the main interface of rolling simulation operation. 4. Link with the basic parameter table because the establishment and maintenance of the database file are carried out under the access system, this study completes the work of parsing the database file with the help of the control ADODC (adodatacontral) of VisualBasic6.0 (VB for short), which is equivalent to the interface between the VB database program and the access database file, so as to realize the connection between the simulation system and the database. Because ADODC only has the ability to access data, the data of the database file is displayed on the subform through the binding control DataGrid with the function of displaying data. Conclusion the database established in this study, including 10 data tables such as polymer basic physical properties table, mechanical parameters table and process parameters table, can meet the requirements of polymer calendering simulation; The system has a preliminary intelligent function, which can continuously update and supplement the database according to the simulation data and the feedback data of the actual test results, and enable the system to automatically evaluate the product quality of the simulation calendering process and the advantages and disadvantages of the operator's simulation operation

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