Study On 3D Solid Modeling Of Conical Twin-Screw Extruder

With the development of plastics industry, especially in plastics constructional materials, conical twin-screw extruders are expanding rapidly and applied widely, and geometry configuration of the conical twin-screw directly influences throughput of extruders and quality of extrusion. Therefore, it is significant to implement parametric 3D solid modeling and engineering drawing for improving quality of design, shortening period of design, reducing cost and realizing CAM.In this paper, according to the geometry configuration of conical twin-screw and a great deal of experiential data of design in conical twin-screw, analyzing a series of experiential formula about design of conical twin-screw and discussing parameters of essential screw configuration, it is the theoretical basis of CAD for conical twin-screw and reliable foundation on researching its applied software.By using function of 3D solid modeling and analysis about VBA (Visual Basic for Application) of AutoCAD, the theoretical end curve of conical twin-screw for 3D solid modeling is modified. At the same time, the parametric 3D solid modeling is availably realized by programming technique of VBA for CAD software in this paper.Based on the practical use and manufacture about conical twin-screw, and considered the geometrical dimension parameter of conical twin-screw and the character of 2D engineering drawing, the parametric 2D engineering drawing relative to its 3D solid modeling software is triumphantly achieved. In the course of implement, the 3D solid modeling and the 2D engineering drawing may be expediently selected in order to satisfy with different demands.The AutoCAD drawing model-place is executed in the circumstance of Visual Basic6.0, and the parametrically drawing and modeling are under the control of a friendly User Interface, which is realized by using VB programs.Anyhow, the achievements of this paper made a good reference and development for an application of the Mechanical CAD to domestic plastics machinery, especially in using CAD to design screws. It also found a good basis for developing specialized software of CAE (CAD and CAM) in other fields.