The mold is the mechanical subassembly that has the role of giving a certain shape to a plastic material with well-determined dimensions. The design and correct execution of injection molds conditions the achievement of high yields of injection processing. Molds for injection of thermoplastic materials are basically composed of two main parts: half mold from the injection nozzle side and half mold from the throwing side. The mold is fixed on the clamping plates of an injection machine. The majority of molds work by injecting the plastic material through a hole with the axis perpendicular to the plane to be separated. In the case of special injections (two-color or three-color injection), the injection is made both perpendicular to the plane to be separated and in the plane to be separated. In the construction of molds, thanks to the infusion of new technologies, optimization is constantly used. An example of this is NC milling after 5 axes. In addition to the reduced processing time of a mold, this also results in higher precision. Compared to NC milling after 3 axes, the processing after 5 axes of irregularly shaped surfaces is done with a smaller number of milling passes, with a better quality of the surfaces. The NC programs for 5 axes claim, thanks to the complex device, a large volume of calculation, at the corresponding processing speed. This can only be solved for the masses with the help of large computers. Complicated and long milling programs can be run with the help of these computers even during the night.

special injections, plastic material, injection mold

mechanical engineering

Presentation: poster