Abstract
It is noted that the strength of the workpiece being processed is not taken into account when assigning locating and clamping scheme for most parts when machining by cutting. It is assumed that the limiting factors are the combination of the physical and mechanical properties of the materials of the workpiece and the cutting part of the tool, which, in combination with a given allowance, determine the required clamping forces for the selected locating and clamping scheme. However, for non-rigid workpieces such as thin-walled sleeves, errors caused by the clamping forces of the workpiece in the device can become dominant. An additional factor complicating the cutting process is the occurrence of significant vibrations that deteriorate the quality of the machined surface. Of particular difficulty is the study and description of the milling process, this is due to the presence of variables in modulus and direction of cutting forces, leading to additional forced vibrations of the process system. It is shown that to reduce vibrations in the system, it is possible to reduce cutting conditions and, accordingly, performance, increase the strength and damping capacity of the system. When installing thin-walled sleeves on multi-purpose machines, clamping devices are of special importance. Devices with metal expanding elements act on a limited section of the cylindrical surface length, and therefore, they cannot increase the vibration resistance over the entire surface. The design of a mandrel with an elastic sleeves, located between the body of the workpiece and the main base mandrel, has been developed. By means of axial compression of the elastic sleeve, its thickness is increased, as well as the strength and damping capacity of the process system is increased, which ultimately leads to a decrease in the roughness of the processed surface by 1.5 times.
Published Version
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