Анализ процесса ротационного выдавливания полых изделий на оправке парными роликами

Abstract

В программном комплексе DEFORM-3D проведено численное моделирование для заготовки из стали 10, процесса ротационного выдавливания полых изделий на оправке парными роликами для двух схем: с угловой и поперечной подачей роликов. Расчетным путем определено зависимость усилия от величины вдавливания роликов в заготовку, распределение ресурса пластичности и напряженно-деформированное состояние материала в объёме заготовки в процессе вдавливания роликов и при продольном проходе вдоль оси вращения заготовки. Кроме этого определено определенно характер формообразования канавки при вдавливании роликов в заготовку.

Methods of rotational extrusion with paired rollers on holders by straight rolling and back extrusion are used in producing of tubular and hollow products. In order to intensify the process and to prevent holders bending two or more rollers are used. Definition of roller introduction technological parameters in the process of rotational extrusion is necessary for production mode determination. For this purpose, numerical modeling of hollow products rotational extrusion with paired rollers on holder for workpiece from steel 10 in program complex DEFORM-3D was carried out. Numerical modeling was carried out for two schemes: with angular and cross feed of rollers. For analysis of rotational extrusion process, it was divided into two stages: rollers introduction on depth of 0,5 mm in a workpiece and rotational extrusion (rollers passing along the axis of workpiece rotation). By calculated way effort dependence from rollers introduction into a workpiece, resource of plasticity distribution (damage) and strain-stress state of material in a workpiece volume in the process of rollers indentation and lengthwise rollers passing along the axis of workpiece rotation was defined. Besides, character of groove formation was defined in the process of rollers introduction. In case of angular rollers feed the groove is formed with an influx from the one side, while in case of cross feed of rollers, the influx is formed from both sides of groove, that leads to strain decreasing for one passing.