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With China Plastic Machinery
With China Plastic Machinery
There are many new extruder screws designed based on various extrusion theories and functional requirements, and their design basis is the ordinary extruder screw. The following mainly discusses the characteristics and methods of Huahong's ordinary extruder screw optimization design.
Mechanical optimization design has two main links or contents: one is to establish a mathematical model of the optimization problem, which can be an analytical expression, experimental data or empirical expression, as well as the constraints for solving the problem; the second is to select the solution method for the optimization problem, that is, the optimization method. For the mathematical model in analytical form, in addition to depending on the predetermined optimization goal, it also depends to a considerable extent on the understanding of the working conditions and mechanisms of the components (mechanisms). Therefore, the extrusion theory of extruders naturally becomes an important theoretical basis for the optimization design of extruder screws.
There are many goals for the optimization design of extruder screws, mainly: to achieve the highest production capacity Qmax or the minimum power consumption Nmin under the premise of ensuring the quality of the extrudate.
Figure 1 shows a schematic diagram of the movement of the material solid plug in the screw feeding section. For a given material, the main factors affecting the conveying rate Q are: geometric parameters of the extruder screw, speed n, pressure and temperature, etc., and the expression is: Q = ¦ÐnHDb (Db-H)
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