Stiffness of Underpinning Supports for Fixtures
[ 1 ] Instytut Technologii Materiałów, Wydział Inżynierii Mechanicznej, Politechnika Poznańska | [ P ] employee
2024
chapter in monograph / paper
english
- Rigidity
- Experimental
- Modeling
- Pin
- Displacement
- Spherical Base
- Coefficient
EN Machining of large-sized workpieces with low stiffness is an urgent task. Auxiliary supports are used in machine tools to reduce deformations and vibrations of workpieces due to the action of cutting forces. Auxiliary underpinning supports are preferable to self-installing ones since they have a higher intrinsic stiffness. The stiffness of the underpinning support with a vertical support pin and with improved ergonomic properties was determined experimentally using a spring dynamometer and simulation. The stiffness coefficients were calculated, and a graph of the support displacement’s dependence on the force’s magnitude was constructed. A rotary underpinning support with a spherical base is also considered. This support allows for rotating its moving part in two planes and, accordingly, changes the angles of inclination of the support pin. This expands the technological capabilities of the support since it becomes possible for the support pin to contact inclined or curved surfaces of the workpieces. This support’s stress, displacement, and strain at a force of 4 kN were analyzed. Studies have shown the high stiffness of the underpinning support with a spherical base. Modeling of the underpinning support deformations with a spherical base and the workpiece, where the support pin is brought to the inclined inner surface of the workpiece, was also carried out. A comparative analysis of the stiffness coefficients of the considered supports was carried out: the highest stiffness coefficient underpins a vertical support pin.
03.07.2024
251 - 262
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