FIELD: technological processes.
SUBSTANCE: blank is based with working taper of mandrel that performs working travel bottom-up on processed hole, at first - along bottom end by installation onto bottom support, and then - along top end by pressing to top support, which is installed coaxially in relation to bottom support. Blank is additionally pressed to top support by bottom support that moves in axial direction, impact force of which at blank is less than its weight, and displacement bottom-up is matched with working travel of mandrel.
EFFECT: higher accuracy of processing and tool reliability.
1 dwg
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