Internal broach
AssigneeForst Technologie GmbH & Co. KG
InventorsAndreas Berktold, Norbert Weghaus
Life of this patent
Estimating the term…
Abstract
An internal broach for internally broaching profiles, defined by a bottom and flanks, of female serrations of a work piece, comprises a toothed portion with several rows of broach cutting teeth disposed successively counter to a direction of broaching, successive broach cutting teeth being allocated to each other for broaching a profile. The broach cutting teeth have bottom cutting blades and first and second sides. The first sides are guide flanks, the edges of which are guide edges without cutting ability. The second sides are flank-cutting-blade relief surfaces, the edges of which are designed as flank blades with cutting ability.
Claims9
An internal broach for internally broaching profiles (12), defined by a bottom (14) and first and second flanks (15, 16), of female serrations of a work piece (8), which broach comprises
- a shank (1), which leads in a direction of broaching (22);
- and
- a toothed section (2) with several rows (6) of broach cutting teeth (21a to 21f), the rows (6) being disposed successively counter to the direction of broaching (22);
- wherein broach cutting teeth (21a to 21f) are allocated to each other for broaching a profile (12) of a depth;
- wherein the broach cutting teeth (21a to 21f) have bottom cutting blades (23a to 23f) and first and second sides;
- wherein the bottom cutting blades (23a to 23f) of successive and associated broach cutting teeth (21a to 21f) have a pitch relative to the broach cutting teeth (21a to 21f) which lead in the direction of broaching (22);
- wherein a bottom-cutting-blade relief surface (24) is allocated to the bottom cutting blades (23a to 23f);
- and
- wherein the first and second sides pass through the bottom-cutting-blade relief surfaces (24) and form first and second edges;
- wherein the first sides are guide flanks (25a to 25f) which have no relief or relief angle, whereby the first edges are the first flanks (15) forming guide edges without cutting ability and
- wherein the second sides, at least in proximity to bottom cutting blades (23a to 23f), are flank-cutting-blade relief surfaces (28a to 28f), the second edges, by allocation to the bottom cutting blades (23a to 23f), being flank cutting blades (27a to 27f) with cutting ability.
Dependencies are inferred from the claim text.