Comparative Analysis of the Accuracy of Milling Threads with Various Profiles

The article considers the types of threads to be milled, as well as threads for which milling is not used, based on the analysis of the catalogs of manufacturers of thread cutters. To expand the scope of thread milling, a study of the accuracy of geometric shaping of internal threads of various profiles was made using a kinematic scheme with a parallel arrangement of thread and tool axes. On the basis of the geometric model of thread milling, a design scheme is presented and a program for shaping internal threads of various profiles is developed. Using the developed design experiment plan, a comparative analysis of metric, buttress, round threads and threads for connecting casing pipes was carried out, which allows obtaining the shape of the thread profile, assessing its errors, the straightness of the sides and the possibility of threading according to the accepted degree of accuracy. The results of the study can be useful to designers in designing thread mills and technologists to assessing the possibility of using thread milling in the processing threads of various profiles.

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