Abstract. The article deals with a problem related to a product produced by injection moulding technology focusing on the importance to design the product geometry in the right way. The mould structure is often characterized by uneven wall thickness throughout the entire volume. Thicker walls and a greater accumulation of material can cause the overflow and other distortions. The accumulated material solidifies unequally, so internal tension is developing. Its influence may result in various deformations and surface defects. There is described the application of specific solution for the mould wall thickness correction in real practice. The relief pins method is concerned that was used at the product with commercial name Box Series S-BOX 106 made of polyamide PA 66. After proposed modification of the form, the mould quality has improved and production efficiency has increased. Software Cadmold 3D-f was used for simulation of cooling and injection pressure.
The article deals with the basic technological aspects of injection moulding, pointing to the importance of correct product geometry design. Large differences in the wall thickness of the mould result in uneven cooling, material shrinkage, and the formation of internal stress. This ultimately may give rise to deformations, such as those in form sink marks, and may affect the required quality of the mould. The article describes the application of a specific example of one of the ways of correction of the mould wall thickness used in technological practice of the injection moulding technology. This is a case of employing the method of the so-called relief pins. After the introduction of the proposed modification of the form, the mould quality has improved, thereby increasing the production efficiency in the process of shape optimization of manufacturing the product called Installation Box Series S-BOX 106 made of polyamide PA 66. In addressing the issue, simulation of cooling plastic and injection pressure in Cadmold 3D-f software was employed.
Abstract. The article deals with some aspects of visualisation as the tool of education process quality increasing at technical universities. There is described the sequence of 3D modelling activities that students have to pass in order to be successful in the study and consequently in practice. First, they learn to create simple parts, then they learn to assemble the components into the static or welded assemblies, respectively into movable mechanism. In higher levels, if they absorb the fundamental theoretical knowledge, they can subject the 3D models to the analysis, as are stress, kinematic, dynamic analysis, etc. and compare the computer aided results with the values calculated in classical way. Students can apply the other advantages of the virtual models into the drawings preparation in electronic form and at the tool path verification during the machining simulation. The whole production process can be designed by students, too. They can use several CAD/CAM systems for all activities listed above and compare results to verify the solution.
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