Technological Parameter Analysis of the Reducing Long-Length Pipe Blanks with a Shaped Holes

The description of the billet and the tool, being used to simulate the technological process by means of the Q-Form software, is given in order to further mode determination of reducing long-length pipe blanks with shaped holes. The results of the study were achieved by modeling tools and billets with an external diameter of 16.0...16.5 mm, used to produce products in mechanical engineering. Diagrams of emerging forces and average stresses at matrix and billet contact points, formed during the reduction process, are presented. Three contact zones: the beginning of pressing the billet into the matrix, in the middle and at the end of the reduction process are considered. The influence of the billet outer diameter value on the technological parameter of the process is considered (evaluated). It was revealed that larger billet outer diameter causes elongation during the reduction process. In addition, the construction of mathematical models and the determination of process parameters of reducing long-length pipe blanks with shaped holes is described based on numerical methods, namely the finite element method, which is used in the ongoing study. Depending on the technological process features, various schemes of contact interaction and the action of technological load distribution has been identified. The most widely used reduction schemes are considered. The implementation of the well-known Lagrange equation by the finite element method for tools and billets involved in the technological process requires the need to solve five related systems of equations given in this article. Strains in each discrete element of the mathematical model are determined by the Cauchy equation. The elastoplastic problem is solved for the developed boundary conditions. The purpose of the study is to build mathematical models, providing results to analyze the technological parameters of reducing long-length pipe blanks with shaped holes and conclude that the technology in question can be used in various modes, taking into account deviations in geometry to obtain high-quality shaped profiles of the rifling parts.