Abstract
Abstract. This research is related to metalworking processing of bodies of revolution with the help of universal lathe machines. The technology includes the application of two types of vibrations to the working tool and the processed surface error measurement. To increase the manufacturing accuracy, the workpiece processed surface error is measured while a workpiece is being rotated; this rotation is performed with the workpiece being rigidly fixed in end supports and at the same time being damped in the sections between these supports. Furthermore, the parameters of vibrations applied to the tool working travel are defined by the workpiece form error and the nature of distribution of stresses that appear when the workpiece is fixed; the nature of the workpiece processed surface form error is extrapolated from the data obtained in the workpiece sections between the supports. Before manufacturing, the workpiece is corrected while being fixed in rigid supports, and the correction itself is performed as the function of magnitude and vector of the workpiece maximum deflection plane. The workpiece may be fixed in rigid supports; steady rests with double rollers may be used as such supports. The workpiece dampening in its sections between end supports may be performed using self-centering steady rests.
Highlights
Non-rigid shaft-type vital parts are used in modern-day mechanical engineering, machine tool engineering and instrument engineering
Imbalances in the design parameters of non-rigid bodies of revolution (NRBR) create serious technological difficulties in the production process; the main reasons for these difficulties are the following: a) significant elastic and plastic deformations at all stages of the parts’ processing, assembly and operation; b) low vibration resistance and various types of pliancy of the technological system elements; c) significant influence of technological heredity on the performance reliability; d) workpieces distortion caused by uneven residual stresses added at all the stages of processing; e) the parts’ low thermal resistance
The negative effect of the above-mentioned factors during the production of non-rigid bodies of revolution leads to the technological bases dysfunctions, the parts’ form and size errors, surface defects, cutting modes limitations and, to the decrease of operation accuracy and reliability [1-15]
Summary
Non-rigid shaft-type vital parts are used in modern-day mechanical engineering, machine tool engineering and instrument engineering. Imbalances in the design parameters of non-rigid bodies of revolution (NRBR) create serious technological difficulties in the production process; the main reasons for these difficulties are the following: a) significant elastic and plastic deformations at all stages of the parts’ processing, assembly and operation; b) low vibration resistance and various types of pliancy of the technological system elements; c) significant influence of technological heredity on the performance reliability; d) workpieces distortion caused by uneven residual stresses added at all the stages of processing; e) the parts’ low thermal resistance. The negative effect of the above-mentioned factors during the production of non-rigid bodies of revolution leads to the technological bases dysfunctions, the parts’ form and size errors, surface defects, cutting modes limitations and, to the decrease of operation accuracy and reliability [1-15].
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