A Study on Precision Thread Grinding

概要

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In the thread grinding machine, it is desirable to align the lead-screw and the workpiece on a straight line in accordance with Abbe's principle. But this alignment requires a long space. When the leadscrew and the workpiece are paralleled as in a usual thread grinding machine, it is assumed that the pitch error of the ground workpiece screw is influenced by the tilting motion and out-of-straightness of the table traverse. It is the purpose of this paper to investigate fundamentally how the tilting motion and out-of-straightness of the table traverse change as running time goes by, and how they geometrically influence the pitch error of the ground workpiece screw. In practice, the tiliting motion and out-of-straightness of a certain thread grinding machine are measured over 1 m in length by the autocollimators and the electric level testers. As the result, it is found that the tilting motion of the table traverse much influences the accumulated pitch errors, and that the machine is thermally deformed by some heat sources and the accumulated pitch errors vary during the machine running. Furthermore, some considerations to reduce the accumulated pitch erors are made.
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