Abstract
Stamping of the bearing cages ensures a high enough productivity and consistency with the requirements of a large series manufacture. The roughness of stamped surfaces is one of the parameters for assessing the quality of the cages, which in its turn determines the behaviour in service of the bearings. A large number of input factors corresponding to the stamping process exert influence on roughness parameters. An experimental research has been conceived and developed to assess the influence exerted by the thickness of the blank and the clearance between the active elements of the die on the value of the surface roughness parameter Ra. The mathematical processing of experimental results allowed the identification of empirical mathematical models and graphical representations were designed to offer additional information concerning the influence of the two input factors in the stamping process on a quality parameter of the bearing cage.
Highlights
The bearings are complex machine elements used to support parts found in rotation or oscillation movements
In the case of stamped bearing cages, the main factors able to affect the bearing accuracy are the dimensions and the configuration of the bearing, inclusively the blank thickness, the type and the properties of bearing cage material, the state of the cutting tool edges, inclusively the size and the uniformity of their wear, the clearance between the tool components involved in the stamping process, the sheet flatness, the type and the constructive solution of the stamp, the way of clamping the blank, of limiting the blank feed movement, the existence of a lateral pressure exerted on the blank, the type and the state of the stamping machine etc
One of the technological solutions applied to obtain windows in bearing cages is the application of a stamping process
Summary
The bearings are complex machine elements used to support parts found in rotation or oscillation movements (shafts, gears, belt pulleys, cable rollers, rotary tables etc.). In the case of stamped bearing cages, the main factors able to affect the bearing accuracy are the dimensions and the configuration of the bearing, inclusively the blank thickness, the type and the properties of bearing cage material, the state of the cutting tool edges, inclusively the size and the uniformity of their wear, the clearance between the tool components involved in the stamping process, the sheet flatness, the type and the constructive solution of the stamp, the way of clamping the blank, of limiting the blank feed movement, the existence of a lateral pressure exerted on the blank, the type and the state of the stamping machine etc. Saez de Argandoña et al proved the negative influence of the clearance size between the stamp active components on the geometry of the part, on the cut surface state and on the bur size [3]. The main objective of the research presented in this paper was to estimate the optimal values of the stamping process input parameters, to obtain a surfaces of good quality
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