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.
Highlights
Technological dimensional calculations are a necessary stage of engineering process and determine the quality and economy of manufacturing
At present, when processing hard-totreat materials on NC machines, it is necessary to ensure optimal processing conditions for each workpiece based on reliable information on allowances at each step
According to the existing methodology for calculation of technological dimensions and, 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
Summary
Technological dimensional calculations are a necessary stage of engineering process and determine the quality and economy of manufacturing. Analysis of the existing methods for assigning tolerances and allowances for workpiece, as well as optimization methods [1,2,3,4,5,6] showed that the issue of the correct designation of tolerances and allowances for technological dimensions is very important, relevant and covers many aspects of the problem - methods for obtaining surfaces with the necessary accuracy parameters and quality, increase in efficiency, methods of assigning technological dimensions, etc These methods can be described as the base to the solution of the problem, which relates to the variety of operative factors and their reciprocal action. Except for the methodology [6], do not take information about the workpiece as the initial data
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