US 8,485,762 B2Granted

Internal broaching tool

AssigneeSpezial Werkzeuge GmbH Zella-Mehlis

InventorsJuergen Kuehner, Ernst Hettmann

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Abstract

An internal broaching tool for broaching profiles delimited by a root and flanks in one aspect arranges a relief part between the toothed part and the calibration part. The calibrating broaching teeth in adjacent rows on the calibration part have a guiding flank (without a clearance angle or with a maximum negative clearance angle of 0.1°) and a cutting flank (with a positive clearance angle). The guiding flanks and the cutting flanks on the calibrating broaching teeth located behind each other in the direction opposite the broaching direction are alternately offset relative to each other in adjacent rows. The position, shape, and size of each guiding flank located downstream in relation to the direction opposite the broaching direction are associated with the position, shape, and size of the associated cutting flank (or the flank of the broaching tooth) in the preceding row.

Claims5

Dependent claims

An internal broaching tool for internal broaching of internal tooth systems having a profile root and profile flanks, said internal broaching tool comprising:

(a) a shaft;
(b) a tooth set part disposed adjacent to the shaft counter to a broaching direction, said tooth set part having a plurality of broaching teeth disposed in rows, one behind the other, said broaching teeth comprising profile root blades for pre-broaching of a profile, assigned to one another;
(c) a calibration part disposed to follow the tooth set part counter to the broaching direction, said calibration part having a plurality of calibration broaching teeth disposed in rows, one behind the other;
(d) an end piece;
and
(e) a relaxation part disposed between the tooth set part and the calibration part;
wherein each calibration broaching tooth comprises a guiding flank without a clearance angle or with a negative clearance angle less than or equal to 0.1° and a cutting flank having a positive clearance angle;
wherein in adjacent rows of the calibration broaching teeth on the calibration part each guiding flank and cutting flank is alternately offset relative to one another on the calibration broaching teeth disposed one behind the other counter to the broaching direction, and each guiding flank that follows counter to the broaching direction is associated in terms of position, shape, and size, with a corresponding cutting flank in a leading row.

5 more elements

Dependencies are inferred from the claim text.