Abstract
For straightening of low-rigid cylindrical details like shaft and axes different types of loadings are considered which form tension different in size and in distribution. As the perspective direction, it is possible to consider correction by a bend at the influence of the distributed loading with the subsequent hardening of a billet by superficial plastic deformation based on a cross cheesing of it by flat plates. Purpose of the work was to define tension of the billet at cross correction for the choice of more effective type of loading and processing rational modes. The mathematical apparatus was used based on laws of the theory of an elastoplastic solid and Ansys Workbench software package. Novelty is the research of effective methods of loading at cross correction of cylindrical details. As a result of analytical calculations, value of the residual tension providing correction of cylindrical details was determined. Residual tension necessary for correction of cylindrical details depends on an initial deflection, material and preparation rate. Tension of cylindrical details was defined depending on a type of the application of cross loadings. Bend tension for correction of a shaft at distributed loading is less, than tension from action of cross force. For correction of a shaft with a diameter of 10 mm, 200 mm long and an initial deflection of 0.5 mm it is necessary to create bend tension equal to about 370 MPa. An effective method of loading at cross correction of cylindrical details is the bend at influence of the distributed loading. The received extreme values of bend coefficients are from 5.3 to 5.5 for all cases of shaft rigidity at correction by cross bend at distributed loading with l/L relation equal to 0.8. The developed mathematical model gives quite reliable values of the residual tension providing correction of cylindrical details. The analytical dependence for determination of the size of general deflections and definition of an effective loading type can be recommended for practical use in production for achievement of precision accuracy of low-rigid details like shaft.
Highlights
It is possible to consider correction by a bend at the influence of the distributed loading with the subsequent hardening of a billet by superficial plastic deformation based on a cross cheesing of it by flat plates
The mathematical apparatus was used based on laws of the theory of an elastoplastic solid and Ansys Workbench software package
Novel ty is the research of effective methods of loading at cross correction of cylindrical details
Summary
ОБОСНОВАНИЕ ВИДА НАГРУЖЕНИЯ И РЕЖИМОВ ПРИ ПОПЕРЕЧНОЙ ПРАВКЕ ЦИЛИНДРИЧЕСКИХ ДЕТАЛЕЙ. Для правки маложестких цилиндрических деталей типа валов и осей рассмотрены различные виды нагрузок, которые формируют разные по величине и по характеру распределения напряжения. Целью работы является определение напряженного состояния заготовки при поперечной правке для выбора более эффективного вида нагружения и рациональных режимов обработки. Новизной является определение эффективных методов нагружения при поперечной правке цилиндрических деталей. Эффективным методом нагружения при поперечной правке цилиндрических деталей является изгиб при воздействии распределенной нагрузки. Для поперечной правки заготовок можно использовать различные виды нагрузок, которые формируют разные по величине и по характеру распределения рабочие напряжения. No 7 заготовки при поперечной правке для выбора более эффективного вида нагружения и определение рациональных режимов обработки. Во второй части работы будут представлены условия захвата и напряженного состояния при поперечной обкатке цилиндрических деталей плоскими плитами
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