RETENTION OF THE SECTION BORDER FORM WHEN UPSETTING OF BIMETALLIC ARTICLE
DOI:
https://doi.org/10.14529/met200106Keywords:
forging upsetting, ductility, stress state, magnesium and its alloysAbstract
The aim of the work is to assess the influence of the shell configuration on the deterioration of the interface between the shell and the billet during upsetting. The shell itself in this case acts as an element of the assembly, which allows to increase the level of compression stresses and the level of ductility of the metal, respectively. The computational experiment included the use of the DEFORM software package. The finite element method was used as a solution method. The forging draft was solved using various options for the geometric design of the shell. Magnesium in the cast state was considered as a low-plastic material, copper was used as a shell material. A feature of the configuration of the shell was that it had a triangular cross-sectional shape. It was possible to build graphical dependencies characterizing the degree of straightness of the generatrix of the cylindrical billet after the forging operation as a result of setting and solving problems. This could avoid excessive metal losses in the operation of separating the shell from the billet. Dimensionless parameters are applied in the form of the ratio of the diameter of the billet on the barrel to the diameter on the contact surface, the ratio of the shell wall thickness to the diameter of the workpiece and the ratio of the height of the workpiece to its diameter. The fact that increasing the thickness of the shell can lead to a concave side surface, especially if the ratio of the height of the billet to its diameter greater than one has been established. The scope of the work results is the pressure treatment of low-plastic metals and alloys, for example, such as magnesium and its alloys.References
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