Technological Process Stability Assessment Based on the Results of Weapon Barrel Blank Dimension Control

Abstract

The technological process of barrel manufacturing begins with the operation of stitching the rods to create a channel in the workpiece. Due to the effect of significant mechanical loads on the workpiece, inhomogeneities occur in cross-section in the form of deviations in diameter. To ensure the stability of the process, it is necessary to analyze the quality indicators in the manufacture of blanks. Product quality improvement consists in the continuous improvement of technological processes, the evaluation criteria of which are quality indicators, for example, according to the geometric dimensions of products. The company gains competitive advantage when the indicators remain stable over time and meet all the stated requirements in the regulatory documentation. process stability is defined as an indicator that ensures the constancy of the probability distributive law of its parameters for a certain period of time. Currently, there is no quality indicator of products or services that have absolute stability. The variability of the indicator is influenced by a fairly wide range of different indicators: the difference in the mechanical characteristics of the source material and workpieces, the wear of technical equipment (fixtures, equipment, tools), changes in environmental conditions, the level of qualification of working personnel, etc. Depending on the degree of influence of these factors, there will be instability in the values of quality indicators. To determine the reasons for the quality indicator spreading, studies were conducted on the example of blanks of rifle barrels. In the course of the study, the method of Shuhart control charts was used to determine the causes of deviations unambiguously. This method made it possible to construct a time schedule for changing the parameters of the process of obtaining barrel blanks before forging to carry out statistical control of its stability. The values of the critical geometric dimensions of the barrel blanks before forging were measured. Deviations of the obtained values from the required parameters were found, which indicates a violation and instability of the process of manufacturing the barrel blanks.