EVALUATION OF THE INFLUENCE OF THE FRICTION COEFFICIENT ON THE STRESSED AND DEFORMED STATE OF THE FENDING
On the basis of a series of computer simulations, a study is being made of the process of flanging a sheet blank with the simultaneous implementation of thinning of the flanged material. The simulation results are presented and the technological force, deformations, stress intensities, average stresses during flanging are investigated. The highest values of these indicators are given for all studies carried out, a feature of which is the combination of flanging and thinning processes. The regularity of the influence of the friction coefficient on some process parameters at a fixed thinning value is revealed. The curves of the graph of the technological force depending on the movement of the punch at different Coulomb friction coefficients are given. Conclusions are drawn about how the Coulomb friction coefficient affects the stress-strain state: strain intensity, stress intensity, tensile stresses, as well as the technological force required to implement the process of combined flanging with material thinning. Recommendations are given on the best lubricant to use for this thinning flanging process.