Hybrid threading tap with reamer portion and thread cutting portion
AssigneeGM Global Technology Operations LLC
InventorsLokesh Choudhary, Tiruttani Munikamal, Qigui Wang, David A. Wulbrecht
Life of this patent
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Abstract
A hybrid threading tap includes a reamer portion and a thread cutting portion having a plurality of cutting teeth. The thread cutting portion is arranged with the reamer portion along the longitudinal axis. The reamer portion is configured to be advanced within a hole of a workpiece to plastically deform and expand the hole to an expanded hole and provide the expanded hole with a zone of residual compressive stress. The plurality of cutting teeth is configured to cut a threading into the expanded hole within the zone.
Claims20
A hybrid threading tap that defines a longitudinal axis, the hybrid threading tap comprising:
- a reamer portion;
- and
- a thread cutting portion having a plurality of cutting teeth, the thread cutting portion arranged with the reamer portion along the longitudinal axis;
- the reamer portion configured to be advanced within a hole of a workpiece to plastically deform and expand the hole to an expanded hole and provide the expanded hole with a zone of residual compressive stress;
- and
- the plurality of cutting teeth configured to cut a threading into the expanded hole within the zone.
A method of manufacturing a hybrid threading tap comprising:
- forming a reamer portion on a shaft having a longitudinal axis;
- and
- forming a thread cutting portion on the shaft to include a plurality of cutting teeth, the thread cutting portion arranged with the reamer portion along the longitudinal axis;
- the reamer portion configured to be advanced within a hole of a workpiece to plastically deform and expand the hole to an expanded hole and provide the expanded hole with a zone of residual compressive stress;
- and
- the plurality of cutting teeth configured to cut a threading into the expanded hole within the zone.
A method of forming a threaded hole in a cast workpiece using a hybrid threading tap in a single stroke comprising:
- providing a cast workpiece with a hole;
- advancing, in the single stroke, a reamer portion of the hybrid threading tap within the hole to plastically deform and expand the hole to an expanded hole and to provide the expanded hole with a zone of residual compressive stress;
- and
- cutting, in the single stroke, a threading into the expanded hole within the zone using a thread cutting portion of the hybrid threading tap, the thread cutting portion including a plurality of cutting teeth, the thread cutting portion arranged with the reamer portion along the longitudinal axis of the hybrid threading tap.
Dependencies are inferred from the claim text.