Shaping processing of circular quartering keyway in deep hole often exhibits low accuracy, low symmetry between keyway and the reference plane, which is also difficult to control. On the analysis of why the symmetry out of permission, and the use of form and location tolerance measurement principle, and the method of measurement and evaluation of space symmetry error, a new machining method based on symmetry detection and compensation on line is proposed by means of controlling the angel between the projection line and the standard line. A double combined manual self-cantering fixture is also designed to realize the radial self-cantering and axial location, and the reference plane of built-in straight slot is derived out to make it detectable and controllable. An online multi-degree of freedom symmetry detection device and corresponding numerical control (NC) programs are also designed for automatic detection and control of symmetry error. Subsequently, mass production of high symmetric deep hole keyways are finished by means of NC gear shaper servo control of rotating shaft angle compensation and bidirectional cutter back-off amount translation compensation, and combination of NC control of fixed angle processing. Deep hole keyway processing examples indicate that the fixture structure and the online multi-degree of freedom symmetry detection device is reasonable and reliable, which can keep the symmetry error of deep hole keyway within 0.03 mm. And it provided a new processing approach for high precision deep hole keyway processing.
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