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  • Modeling the effect of billet diameter deviations on dimensional accuracy when profiling shaped tubes to improve the process

    The issues of improving the quality of products produced by predicting the resulting geometric characteristics of the shape of the pipes to be profiled and their accuracy are considered. An objective mathematical model was created that adequately describes the real process. The computational experiment was performed using software packages that allow implementing the ANSIS and DEFORM finite element method. The dependencies of the studied shape parameters on the outer diameter of the workpiece are established. The presented dependencies and the proposed guidelines for the conduct of the process are of practical use and are useful to developers and consumers of process equipment for predicting the results of profiling

    Keywords: Pipe profiling, deformation, stress, mathematical model, finite element method, accuracy, quality

  • Stress-deformed state of pipe behavior during roll-forming withincomplete coverage of the pipe perimeter

    The process of profiling tubes with rollers was considered. The method of solving the problem was considered. The stress-strain state of the metal in this process was determined, the equations of relative deformations was given, the shear strain intensity in cylindrical coordinates are given for the case of a plane homogeneous deformed state. The stress state index was defined

    Keywords: Pipe profiling, deformation, stress, flat pattern, mathematical model, stress concentration, stress-strained state, stress state index

  • The analysis of emergencies on linear part of the main gas pipelines.

    In article statistical data on failures on a linear part of the main gas pipelines are presented, the reasons of their emergence are defined. Standard scenarios of development of emergencies are provided, and also the basic principles of determination of frequency of emergence of failures are shined.

    Keywords: accident, analysis, diameter, linear part of the main gas pipelines, depressurization, scenario, pipeline.