FACULTY OF MECHANICS AND TECHNOLOGY AUTOMOTIVE series, year XIX, no.23 B DEVICE AND EXPERIMENTAL STAND TO PROCESS PROFILES BY RADIAL COLD ROLLING WITH ROLLER TOOLS
Processing by volumetric cold plastic deformation is performed by generation (formation) of surfaces through successive plastic deformations (displacements) of some material volumes, under the action of rolling tools. Deformation takes place at ambient temperature and modifies the initial properties of the material definitively, giving certain advantages compared to cutting processing: minimum consumption of material, high productivity, superior mechanical properties of the superficial layer
... uperficial layer generated, special quality of the surface obtained. The advantages of cold rolling fully occur in the case of processing on pieces such profiled surfaces as: thread, grooves, teeth, pieces which can be found in the automotive industry, aeronautics, electrical appliance equipment etc. The radial cold rolling with two roller tools is the most often used procedure and consists in imprinting the profile to be generated by rolling the semi-product between the two roller tools. The paper presents a solution patented by authors to obtain a device to roll with two roller tools, which is mounted on the transversal sledge of an universal lathe. This device can be used, in terms of economic efficiency, to obtain the different types of profiles (by changing the tools roller) carried on the parts in small series. Also, the paper presents an experimental stand which allows measuring in real time some process parameters: rolling force, penetration of the rollers in the piece, rotations of the piece and of the two roller tools. These values are taken over by the measurement system as time functions and introduced in the memory of a computer for further processing. Thus, the stand can be used for experimental development of experimental research in the process of radial rolling with roller tools (determinations of evolution laws of process parameters, establishment of process analytical models, validation of numerical models of the process and so on).