Development Of CAD Software For Profile Extrusion Die And Structural Stability Analysis Of Die Head

Plastic profile is the main processing object of extrusion molding equipment,irregular profile has been widely applied in life,especially in construction industry,such as plastic doors and windows,water pipes,line grooves and so on.In the extrusion molding process,the extrusion die occupies a very important position and plays a decisive role in the quality of the extruded products.The design of the traditional extrusion die is designed on the basis of the general CAD software.The design way of extrusion die has many defects,such as large amount of work,low efficiency,and many human errors.Developing a special CAD software for profile extrusion die can realize the digital design of extrusion die,and can greatly reduce the design cost of extrusion die.At the same time,combined with CAE simulation analysis,it is of great significance to improve the design efficiency and quality of the die.First of all,In-depth study of extrusion die design theory and practical design,and the development of CAD and CAE software technology research.Demonstrate the feasibility of developing software for extrusion dies.And determine the software development platform,tools and computer language,Combined with the idea of software engineering,the structure frame of CAD software for profile extrusion die is built.Secondly,after analyzing and summarizing the design principle of extrusion die,the design of extrusion die is divided into several modules.For each module design,determine the program algorithm and write source code.For the determination of plate size,the theoretical formula and empirical formula are embedded into the program in the form of code;For the design of the characteristics around the cavity,the algorithm of differential location points is designed to achieve intelligent location and modeling;For the design of connection features,the template method and grid positioning method are adopted;For plate-to-plate association features.The algorithm of derivative design is proposed;For the rest of the special structure,the mathematical model library is built in the program,which can be loaded intelligently according to the characteristics of die structure.Then,for the length calculation of extrusion die,cooling system,vacuum adsorption system and other auxiliary structures,the program design scheme is proposed.The intelligent algorithm design and human-computer interaction design are provided for the design of straight-through water path,transverse s-shaped cooling water path and longitudinal s-shaped cooling water path of the cooling system.Theoretical design and intelligent loading scheme are provided for the design of air holes,air tanks and air chambers of vacuum adsorption system.For the design of the auxiliary structure,the parametric design scheme of relevance is provided.Finally,The structural stability of the programmed extrusion die is evaluated.The key structure of the die is analyzed by using ANSYS software.According to the results of finite element analysis,the software design algorithm is optimized,The rationality of the software design is realized,and the test cost in the actual production of the extrusion die is reduced...