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In this paper thin-walled part deformation under finishing turning condition was investigated. As a research object, bearing ring made of alloy steel was taken. To evaluate the influence of gripping force on part deformation FEM analysis was conducted. Base on the obtained results, it can be stated that application of 6-jaw chuck allows to reduce significantly the stress and deformation of thin-walled parts. According to the Figure 8, if we apply the gripping force greater than 15 kN on 3-jaw chuck, yield limit would be exceeded. Consequently, bearing ring would be damaged. Even the lowest gripping force applied to the 3-jaw chuck (10 kN), results in bearing ring deformation of 0.09 mm - which is not acceptable. With the same gripping force applied by 6-jaw chuck we can reduce the maximal deformation of bearing ring to 5 m. As a result, geometrical tolerances can be fulfilled. Base on presented mathematical model it's possible to estimate the thin-walled part deformation under gripping force of lathe chuck. Consequently, right value of hydraulic pressure can be adjusted to reach suitable gripping force, that would provide required geometrical accuracy during production process. Furthermore, presented research can be helpful for selection of appropriate CNC lathe equipment, like hydraulic clamping cylinder and power chuck |
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