Calculation of linear technological dimensions with adaptation

Abstract

Technological dimensional calculations are a necessary stage of engineering process and allow to determine machining allowance. The problem is that, when processing hard-to-treat materials on NC machines, it is necessary to provide optimal processing conditions for each workpiece based on reliable information on allowances at each operation. However, according to the existing methodology for calculation of technological dimensions and, accordingly, allowances, for the hypothetical workpiece with wide dimensional tolerances the technological dimensions and allowances are determined once, while it is assumed that the specific workpiece must engage with the tolerances of the hypothetical workpiece. The article deals with an example of calculating linear technological dimensions with adaptation, based on the results of monitoring and performing a separate calculation of the dimensions and allowances for each concrete workpiece in each operation. The calculation is carried out using a processing scheme, a graph, equations of dimensional chains and a computer program. As a result of the study, it was found that the calculation of linear technological dimensions with adaptation makes it possible to determine the actual values of allowances at each transition and thereby ensure predictable processing conditions.