Abstract
The stress-strain state of a clamping device, an eccentric cam, is considered by the finite element method in the domestic WinMachine software package of the Russian company NTC APM. The correspondence of the solution in the specified software package to the theoretical solution of the Hertz problem has been verified. The dynamics of changes in stress patterns in the contact spot of the cam cylinder with the reference plane is shown depending on the size of the contact spot: the increase in maximum contact stresses with a decrease in the width of the site is hyperbolic. The illustrations show maps of equivalent stresses in the cylinder and the handle of the eccentric according to the theory of greatest tangential stresses and maps of safety margin coefficients. Recommendations have been obtained for improving cam geometry to reduce contact stresses with increased clamping forces by making annular belts at the ends of the eccentric cylinder near its largest diameter, widening the eccentric cylinder. It is also proposed to increase the diameter of the axis of the eccentric to 40-50% of its outer diameter. Thus, the present work is aimed at solving the problem of optimizing the stress-strain state of cylindrical bodies in elastic contact with a plane. The stress-strain state of an eccentric clamping device is considered as a technical example. Thus, the present work is aimed at solving the problem of optimization of stress-strain state of cylindrical bodies elastically contacting the plane.
Keywords:
cam, eccentric, finite element method, Hertz problem, stress and strain maps