| 摘要 |
A method and device for the precision cutting of a plurality of slots with arched closed ends at regular angularly spaced intervals about the periphery of a thick-walled, bell-shaped steel workpiece. The plurality of slots are cut simultaneously in the workpiece first by an equal number of cutting blades which during a first period cut into the lateral tubular wall of the workpiece by relative displacement along the axis of the workpiece. The workpiece is held in a cutting die which is mounted on a punch press and which during a second period cuts into the outer closed end of the workpiece during the continued relative axial displacement. In a final preferred step the chips formed during the previous steps are severed by the radial outward displacement of the cutting blades toward the cutting edges of the cutting die along slides spring biased to their initial position and inclined toward the cutting die. Alternatively, the cutting blades may be mounted fixed relative to one another in a unitary block.
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