Abstract
The results of the study of the hardness characteristics of the collet-part lathe system, which are essentially nonlinear and influence the damping parameters of the spindle assembly unit, are presented. The aim of the work is to study the characteristics of the nonlinear hardness of the elements of the collet-part technological system. In order to realize this aim, in the course of experimental research, static and dynamic characteristics of the spindle core hardness are defined, which are looped hysteresis curves that are characteristic of mechanical systems with a large number of bonds. Measurements of nonlinear parameters of the hardness of the collet-part system are carried out. Measurements are made according to the original method. The basis of the technique is the multi-cycle static load of the spindle in the processing zone in the direction of the vector of the dynamic component of the cutting force by the developed equipment. The equipment includes a screw loader, a two-way ring dynamometer and a mandrel fitted in the spindle of the machine. As a result of the research, the features of the nonlinear characteristics of the hardness of the collet-part lathe system are determined. For the collet-part system, the width of the hysteresis loop in the cold state can reach 20...70 microns. The hysteresis characteristics of the collet-part system in the heated state have the width of the hysteresis loop of 50...200 microns with clamping the part with a diameter of 80...115 mm and a radius of 100...120 mm. Recommendations on the assessment of the hardness change limit depending on the design of the collet are developed. The proposed technique allows one cartridge position to be measured by pressing according to the scheme of loading «on a cam» and «between cams», which reduces twofold the amount of experimental research.
Highlights
Requirements for improving the accuracy of machining parts are constantly increasing, and this trend is quite important for the development of modern production
The developed technique and equipment for experimental research on the basis of the analysis of the results of studies allowed investigating the peculiarities of the formation of nonlinear deformations of the collet-part component
The equipment includes a screw loading device, a circular two-way dynamometer, a mandrel fitted in the clamping chamber of the machine, and measuring devices in the form of indicators
Summary
Requirements for improving the accuracy of machining parts are constantly increasing, and this trend is quite important for the development of modern production. Improving the accuracy of machining on a lathe requires the determination of the nonlinear characteristics of the hardness of the main elements of the elastic system of the machine, including the collet-part system. The studies were carried out with specially developed described in [6] compensates machining errors resulting from technique and equipment This technique was used to perclamping with cams, taking into account their hardness and form experimental studies of the nonlinear hardness chachanges in the radial hardness of the clamping collet system. The. The study [7] analyzed the cutting process under various results of experimental studies of the spindle hardness and clamping conditions and developed a mathematical model to the plunger collet-part system of the lathe made possible to predict the shape of the machined part depending on the type determine their nonlinear hardness parameters. 13 4 14 2 is the reason to believe that the insufficient study of the nonlinear hardness of the collet-part technological system determines the need for further research of the problem
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