Analysis of the shoe length for continuous pressing equipment with a horizontal rotation axis of impeller

With continuous pressing by Conform method, the required pressing pressure is created in split container (shoe or die holder) by the contact friction stresses between surface of annular groove of impeller and workpiece fed into it. These stresses, as in rolling, play a positive role and are active. The size of contact area between workpiece and impeller is determined by the shoe length, which also affects the energy-force parameters of continuous pressing process, such as pressing pressure, torque on wheel shaft, and electric driving power. Based on analytical dependences obtained in the study of energy-force conditions, a method has been developed for calculating the minimum shoe length, which is necessary for implementation of a stable metal extrusion process, taking into account metal rheology and parameters of deformation zone. In this case, parameters of complete contact zone and incomplete contact zone between workpiece and surface of the deforming tool are calculated. The use of the obtained engineering solution in analysis of influence of the main design and technological parameters on efficiency of the profile production process by Conform method allows not to use special software systems (such as Deform 3D) but to solve the problem by using publicly available programs (e.g., Microsoft Excel). The results of comparing calculations with experimental data obtained under industrial conditions showed that the deviation was no more than 10%, which confirms reliability of the formulated solutions and the developed mathematical models.