Flat thread rolling die for pointed screws

Details Flat thread rolling die for pointed screws Flat thread rolling die for pointed screws

B - Operations, Transporting

21

H

B21H 3/06 (2006.01)

Patent

CA 2296998

A pair of thread rolling dies (10, 12) for manufacturing self-piercing, self- tapping or gimlet-type screws (21) employ an off center rise and asymmetrical tip formation surfaces (54, 64) to enhance the slug removal at the tip (28) of the screw.

8ette invention se rapporte à une paire de matrices (10, 12) de filetage par roulage conçues pour la fabrication de vis (21) auto taraudeuses, de vis à tôle ou de vis de type vrille. Ces matrices présentent des surfaces (54, 64) de formation de pointes, asymétriques et à élévation décentrée, qui améliorent le retrait de débouchures à la pointe (28) de la vis.

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