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Manufacturing of the Steering Rod
Velcer, Miroslav ; Štroner, Marek (referee) ; Řiháček, Jan (advisor)
The thesis deals with the design of the production of the lower control arm of the rear axle made of aluminium alloy EN AW-6082 T6 for the Porsche 996. The technology of die forging on screw presses is chosen for the production, which is the focus of the theoretical part of the thesis. At the beginning of the practical part, the manufacturability of the part is evaluated and the basic process parameters such as technological allowances, machining allowances, limit deviations and the shape of the forging groove are determined according to the standards. With the help of a set of cross-sections, the shape of the ideal forging is constructed. Based on it, the dimensions of the forging produced by cross wedge rolling are determined. The selection of cutting and heating of the blank is related to this issue. Based on the determined parameters, a forging tool is constructed. Furthermore, the calculation of the forging force according to Tomlenov is performed, on the basis of which the screw press is selected. To verify the functionality of the forging tool with the given forging die and to analyze the process including the force parameters, numerical simulation is carried out in Simufact Forming software using finite element method.
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Manufacturing of a Wheel Nut With Outer Hexagon
Dvořák, Ondřej ; Forejt, Milan (referee) ; Řiháček, Jan (advisor)
The thesis deals with the design of a production technology for a wheel nut with an external hexagon, a tapered seating surface, and a shank. The production series is set at 200,000 pieces per year. The raw material is a coil of wire with a circular cross-section and a diameter of 20 mm made of steel 11 320. After evaluating the specified requirements and conducting a literature review, the production technology of cold forming is selected, specifically the combination of extrusion and upsetting. Three basic production processes are designed, which are subsequently optimized, and their manufacturability is verified using the simulation program Simufact Forming 1.6. For the most suitable production variant, the flow stress, deformation resistance, and forming forces are calculated for each operation. By comparing with the simulation results, the total force required to produce the given nut is determined, which is crucial for selecting a suitable machine. The forming machine used is a CBF 204L with a nominal force of 3,500 kN, for which a three-operation tool is designed. During the tool design, the internal radial pressure acting on the die is also verified. The results indicate that it is necessary to use encapsulation using a single clamp for the second operation. The tool is constructed to be compatible with the parts of the chosen machine according to the provided layout and available machine parameters.
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