Abstract
The object of the article is hexagonal profile tubes with a round inner hole. Tubes of such configuration have wide enough application, however the way of their obtaining by drawing in profile tool is insufficiently investigated. The paper is devoted to description of creation of finite element model of plastic deformation process of pipes, the basic computational capabilities of the model are given, a number of conclusions made on the basis of modelling results are given.
Highlights
Metal products, providing the best ratio of economic effect from their application to the cost of production and operation, meet the modern requirements of energy and resource saving
It is established that the choice of the outer diameter and wall thickness of the billet are within rather narrow limits
The ratio of radial and longitudinal displacements is such that even if the outer diameter of the billet exceeds the furthest from the pipe axis point of the profile on the profile ribs there is a zone of out-of-contact deformation, which decreases in width and height as the pipe moves from the entrance into the deformation centre to the exit
Summary
Metal products, providing the best ratio of economic effect from their application to the cost of production and operation, meet the modern requirements of energy and resource saving. The main difference of deformation centre during drawing of hexagonal tubes with variable wall thickness along the perimeter from drawing of round tubes under otherwise identical process conditions (drawing, length of plastic zone, stresses, contact friction, etc.) is asymmetry of metal flow relative to the drawing axis. This leads to an increase in nonuniformity of deformation, the emergence of additional shifts in different directions of the contact surface and longitudinal stresses. In order to establish a picture of the features of the above parameters, let us consider sequentially: the influence of the billet dimensions on the geometry of the finished tubes, the shape change of the contact zone boundaries of the hearth and rib curvature, metal movement along the pipe faces and ribs for cases of polygonal cross-section description
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