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US 7,338,235 B2Granted
Internal broach
AssigneeForst Technologie GmbH & Co. KG
InventorsNorbert Weghaus, Otto Pfitzer, Andreas Berktold
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 having a toothed section with several rows of broach cutting teeth, the rows being disposed successively counter to a direction of broaching, with 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 relieved flanks, the edges of which are relieved edges without cutting ability.
Claims9
An internal broach having broach cutting teeth for internally broaching final profiles (12), wherein each of the broach cutting teeth cut a chip which in total form a final bottom (14) and final profile flanks (15, 16), of female serrations of a work piece (8), comprising
- a shank (1), which leads in a direction of broaching (22) and has a central longitudinal axis (9);
- 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);
- with successive broach cutting teeth (21a to 21f) being allocated to each other for broaching a profile (12) of a depth;
- with each of all the broach cutting teeth (21a to 21f) in the several rows of the toothed section having only one each of first and second sides respectively facing the final profile flanks and a bottom cutting blade (23a to 23f) forming an edge on a bottom cutting blade relief surface (24) which edge extends as an arc of a circle between the first and second sides so that the cutting blade cuts over a full final profile width (b);
- wherein the circles are concentric;
- wherein the bottom cutting blades (23a to 23f) of successive and associated broach cutting teeth (21a to 21f) each cut the chip to a thickness corresponding to a pitch (a) between the broach cutting teeth (21a to 21f) that lead in the direction of broaching (22) and forms the final bottom and a portion of the entire final profile flanks (15, 16) corresponding to the thickness of the chip cut, and;
- wherein the first and second sides join the bottom-cutting-blade relief surface (24) and form first and second edges;
- wherein all of the first sides are guide flanks (26a to 26f), lie within a same curved plane with the first edges being guide edges (27a to 27f) without a cutting ability to form the allocated profile flank (15);
- wherein all of the second sides are relieved surfaces (29a to 29c) which do not touch the profiled flank (16) that the second sides face and which each extend in its own curved plane over the entire height of the respective broach cutting teeth, wherein all of the second edges are relieved edges (28a to 28f) without a cutting ability to form the allocated profile flank in the vicinity of the pitch (a), and
- wherein the broaching of the final profiles takes place exclusively by means of the bottom cutting blades.
8 more elements
An internal broach having broach cutting teeth for internally broaching final profiles (12), wherein each of the broach cutting teeth cut a chip which in total form a final bottom (14) and final profile flanks (15, 16), of female serrations of a work piece (8), comprising
- a shank (1), which leads in a direction of broaching (22) and has a central longitudinal axis (9);
- 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);
- with successive broach cutting teeth (21a to 2lf) being allocated to each other for broaching a profile (12) of a depth;
- with each of all the broach cutting teeth (21a to 21f) in the several rows of the toothed section having only one each of first and second sides respectively facing the final profile flanks and a bottom cutting blade (23a to 23f) forming an edge on a bottom cutting blade relief surface (24) which edge extends as an arc of a circle between the first and second sides so that the cutting blade cuts over a full final profile width (b);
- wherein the circles are concentric;
- wherein the bottom cutting blades (23a to 23f) of successive and associated broach cutting teeth (21a to 21f) each cut the chip to a thickness corresponding to a pitch (a) between the broach cutting teeth (21a to 21f) that lead in the direction of broaching (22) and forms the final bottom and a portion of the entire final profile flanks (15, 16) corresponding to the thickness of the chip cut, and;
- wherein the first and second sides join the bottom-cutting-blade relief surface (24) and form first and second edges;
- wherein all of the first sides are guide flanks (26a to 26f), lie within a same curved plane with the first edges being guide edges (27a to 27f) without a cutting ability to form the allocated profile flank (15);
- wherein all of the second sides are relieved surfaces (29a to 29c) which do not touch the profiled flank (16) that the second sides face and which each extend in its own curved plane over the entire height of the respective broach cutting teeth, wherein all of the second edges are relieved edges (28a to 28f) without a cutting ability to form the allocated profile flank in the vicinity of the pitch (a);
- wherein the broach cutting teeth (21) which are side by side relative to the direction of broaching (22), are disposed such that with respect to the central longitudinal axis (11) annular chip spaces (31) are arranged;
- and
- wherein broach cutting teeth (21a to 21f), successive counter to the direction of broaching (22), are disposed in rows (6) so that all of the first and second sides are parallel to the central longitudinal axis (9), and
- wherein the broaching of the final profiles takes place exclusively by means of the bottom cutting blades.
11 more elements
An internal broach having broach cutting teeth for internally broaching final profiles (12), wherein each of the broach cutting teeth cut a chip which in total form a final bottom (14) and final profile flanks (15, 16), of female serrations of a work piece (8), comprising
- a shank (1), which leads in a direction of broaching (22) and has a central longitudinal axis (9);
- 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);
- with successive broach cutting teeth (21a to 21f) being allocated to each other for broaching a profile (12) of a depth;
- with each of all the broach cutting teeth (21a to 21f) in the several rows of the toothed section having only one each of first and second sides respectively facing the final profile flanks and a bottom cutting blade (23a to 23f) forming an edge on a bottom cutting blade relief surface (24) which edge extends as an arc of a circle between the first and second sides so that the cutting blade cuts over a full final profile width (b);
- wherein the circles are concentric;
- wherein the bottom cutting blades (23a to 23f) of successive and associated broach cutting teeth (21a to 21f) each cut the chip to a thickness corresponding to a pitch (a) between the broach cutting teeth (21a to 21f) that lead in the direction of broaching (22) and forms the final bottom and a portion of the entire final profile flanks (15, 16) formed corresponding to the thickness of the chip cut, and;
- wherein the first and second sides join the bottom-cutting-blade relief surface (24) and form first and second edges;
- wherein all of the first sides are guide flanks (26a to 26f), lie within a same curved plane with the first edges being guide edges (27a to 27f) without a cutting ability to form the allocated profile flank (15);
- wherein all of the second sides are relieved surfaces (29a to 29c) which do not touch the profiled flank (16) that the second sides face and which each extend in its own curved plane over the entire height of the respective broach cutting teeth, wherein all of the second edges are relieved edges (28a to 28f) without a cutting ability to form the allocated profile flank in the vicinity of the pitch (a);
- wherein broach cutting teeth (21) which are side by side relative to the direction of broaching, are disposed such that with respect to the central longitudinal axis (11) helically extending chip spaces (31′) are arranged;
- and
- wherein broach cutting teeth (21a to 2lf) successive counter to the direction of broaching (22), are disposed in rows (6) so that all of the first and second sides are parallel to the central longitudinal axis (9), and
- wherein the broaching of the final profiles takes place exclusively by means of the bottom cutting blades.
11 more elements
Dependencies are inferred from the claim text.