The Research On The Plasticizing Quality Of Large Injection Molding Machine Screw

Injection molding machine screw is the main core component of injection molding machine, which is directly in contact with the plastic raw materials, plastic raw materials in the barrel during the plasticizing, screw plays the most crucial role. The quality of plastics is good or bad will directly affect the quality of products, such as the appearance and the strength of the final product. Different screw have different geometric structure, and therefore ultimately shape the screw geometry will affect the quality of final plastic products, but also one of the important indicators of the quality of the injection molding machine performance.Currently, research on the quality of the injection screw plastics melt theory mostly related reference melt extrusion screw conveyor theory as qualitative analysis and approximation. Different from the extruder screw type, since the injection screw own characteristics:a composite movement of rotation and retreat. Thus, the theoretical reference extrusion screw to study evaluated the merits of the injection screw plasticizing quality although some merit, but it is not very comprehensive. In recent years, scholars of the injection screw evaluation and research continue to increase, but also more in- depth research, specifically. But the cost and practicality considerations for research, mostly current research based on small injection molding machine screw, so more research is the quality of plastics injection molding of small diameter screw. Although the injection screw with different diameters have similar design principles, geometry design has some similarities versatility, but for the quality of plastics injection molding machine screw large study still does not have.This article is the premise of the experiment, on the same injection molding machine, for four different design parameters of the same diameter as large single edge injection molding machine screw conducted on several important aspects of the quality of plastics and comparative experiments. By reference to the injection screw design theory, set the main points of the screw: compressed length and compression ratio. Repeatability and mechanical properties, the melt viscosity of uniformity, the size of the plastic melt viscosity and other aspects of the quality of products from the scientific analysis through experiments summarized. Effects of different process parameters and methods of scientific experiments DOE four screw plasticizing quality, summarized the important parameters affecting the plasticizing screw quality, and ultimately through the optimization of demonstration. Thus the formation and establishment of a more practical research methods, summed up a set of reference can be applied to actual production theory.