Title:
DRILL MANUFACTURING PROCESS AND SAID DEVICE FOR CONCRETE WORK
Document Type and Number:
Japanese Patent JPS53133569
Kind Code:
A
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.
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Inventors:
KUROODO BURUNIKON
JIEEMUSU MANSHIYON
JIEEMUSU MANSHIYON
Application Number:
JP4916078A
Publication Date:
November 21, 1978
Filing Date:
April 24, 1978
Export Citation:
Assignee:
SANTOURU TECH DEIENDEISUTOURIE
International Classes:
B21D3/12; B21C37/15; B21D11/14; B23P15/32; C21D7/13; E21B10/44; (IPC1-7): B21D11/14