Process and a device for the production of grooves on a wall of

Metal deforming – By use of tool acting during relative rotation between tool... – During rotation of work

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72190, B21H 304

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active

048380660

ABSTRACT:
The process according to the invention relates to the production of grooves such as helical threads on the wall of tubes composed of ductile or plastic materials without removal of matter.
It involves using a knurling tool (11) of radius (R.sub.1) which is freely rotatable about an axis (X.sub.3). This axis covers, in the direction indicated by the arrow F2, a determined closed curve (12) which, in the figure, is a circumference of radius (R2) and of axis (X.sub.4).
The enveloping curve of the path of the shaping edge (15) of the knurling tool has a region of intersection (13) with the wall of revolution (10) of axis (X.sub.2). The diameter of the knurling tool is greater than the diameter of the circumference (12). A helical thread is obtained by moving the wall of revolution (10) in relative manner along its axis (X.sub.2) relative to the knurling tool (11).

REFERENCES:
patent: 2991672 (1961-07-01), Meyer et al.
patent: 3439519 (1969-04-01), Gerding
patent: 3955391 (1976-05-01), Wilson

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