Method and machine for the manufacture of long concrete drills p

Details Method and machine for the manufacture of long concrete drills p Method and machine for the manufacture of long concrete drills p

1978-04-20

1980-02-19

Larson, Lowell A.

Metal deforming

By use of non-deforming work-gripping clamp and relatively...

By individually non-deforming clamps

72371, 76108T, B21K 504

Patent

active

041888138

ABSTRACT:
A part such as a long concrete drill provided initially with rectilinear splines is heated in successive zones while producing a controlled increase in the distance between the two extremities. The part to be formed is thus subjected to controlled plastic elongation while the two extremities are driven in rotation at different speeds in order to subject the splined portion to a twisting effort and thus to convert the rectilinear splines to helical splines.

REFERENCES:
patent: 2715431 (1955-08-01), Grossu
patent: 3117471 (1964-01-01), O'Connell et al.

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