No abstract

The development of engineering and technology necessitates the search for new solutions related to the release of innovative products with high added value, which include long-length cold-worked screw sections. An analysis of the methods for producing long screw profiles is made, as a result of which a new method is proposed that differs from the known methods by the absence of a twisting operation for forming a helical surface. This feature of the new method for producing long screw profiles simplifies the design of the device and reduces energy consumption. The influence of the workpiece diameter and the number of passes of the helical surface on energy consumption was studied, and a comparative schedule was constructed that proves the advantages of the proposed method for producing screw sections by drawing. For the strength analysis of equipment, a dependence is proposed by which the force that occurs when drawing long screw profiles can be found, taking into account the deformation conditions and design features of the device forming the screw surface. Using the fourth theory of strength, a dependence is obtained to determine the condition that guarantees the absence of breaks in the process of drawing a screw profile.

No abstract

Current trends in the development of metal forming methods are considered. Along with the increase in production volumes, the tasks of quality improvement, expansion of the product mix and energy costs reduction are becoming more and more important. To solve the set tasks, the most promising methods are combined processing, such as rolling-pressing, casting-rolling-pressing. The combination of different processing methods in one process allows conditions for the production of new profiles to be created, energy consumption to be reduced. However, the lack of sophistication of the issue in theoretical terms, the few experimental data make it difficult to find optimal modes of shaping and layout of equipment when combining processing methods. To determine the energy-efficient conditions of the rolling-pressing process, the rational layout of the equipment, new dependencies are proposed. Conducted analytical studies have proved that when implementing the rolling-pressing process for each deformation condition in the roll-matrix system, there is an optimal matrix installation location that provides the maximum drawing coefficient with minimal energy consumption. The feasibility range of the combined rolling-pressing process was established, energy-efficient deformation modes were determined, taking into account the design features of the deforming unit and the shape parameters. Recommendations for the rational layout of the deforming unit equipment, carrying out the rolling-pressing process were developed.

Сибирский государственный индустриальный университет (654007, Россия, Кемеровская обл., г. Новокузнецк, ул. Кирова, 42) Аннотация. На основании результатов моделирования процессов прокатки в сортовых калибрах простой формы определены и экспериментально подтверждены закономерности течения поверхностных слоев заготовок и их влияние на формирование напряженно-деформированного состояния металла в процессе прокатки. С учетом сформулированных рекомендаций разработана и прошла опытно-промышленное опробование новая калибровка валков черновой группы клетей непрерывного мелкосортного стана 250-2 ОАО «ЕВРАЗ ЗСМК», использование которой позволило увеличить выход годного при производстве проката из качественных конструкционных сталей на 3 %. Проведена оценка повышения эффективности производства за счет увеличения производительности при внедрении процесса прокатки-разделения в условиях действующего непрерывного мелкосортного стана 250-1 ОАО «ЕВРАЗ ЗСМК». Предложена методика для определения кратности разделения в зависимости от необходимого приращения производительности, приведены рекомендации по расчету скоростного режима в черновых и чистовых клетях непрерывных станов, фактические данные по изменению суммарных коэффициентов вытяжки и скоростных условий по группам клетей при получении арматурных профилей № 10, № 12 и № 14.