Roll for a radial thread-rolling head
AssigneeWilhelm Fette GmbH
InventorsAndreas Focken, Klaus Oppelt
Life of this patent
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Abstract
A roll for a radial thread-forming head which has disposed at its circumference a thread-forming profile with a flattened area, a thread entry portion, a thread calibrating portion, and a thread exit portion, characterized in that an annular, continuous groove portion is formed in the longitudinal half of the roll in a radial plane at the circumference, except for the flattened area, and a thread-forming profile is formed in the two sides of the groove portion wherein the pitches of the thread-forming profiles are opposed and the positions of the flattened areas are coincident.
Claims7
An integral roll for a radial thread rolling head for forming a thread into a workpiece, the integral roll having an axial length and a circumference, the integral roll comprising:
- two thread-forming profiles (10, 12, 10a, 12a), the two thread-forming profiles being disposed at the circumference and being axially arranged in series, the two thread-forming profiles having pitches which are opposed, each of the two thread-forming profiles having a profile height and a profile diameter, each of the two thread-forming profiles include a flattened portion (16,24), an entry portion, a calibrating portion and an exit portion, the two thread-forming profiles constructed and arranged such that the flattened portions, the entry portions, the calibrating portions and the exit portions of one of the two thread-forming portions come into contact with the workpiece during operation, the flattened portions of both of the thread-forming profiles being opposingly aligned;
- and
- a continuous groove portion (14) disposed about the circumference, the groove portion being positioned midway along the axial length and having a predetermined width and extending to a predetermined depth in a radial plane between the two thread-forming profiles, the groove portion not extending into the flattened portion.
Dependencies are inferred from the claim text.