METHOD OF MANUFACTURING RESILIENT SCREW THREAD WITH CLOSED HELICAL CAVITY INSIDE ITS PROFILE AND THREAD-ROLLING TOOL THEREFOR

WIPO Patent Application WO/1981/000365

A1

A method of manufacturing a resilient screw thread with a closed helical cavity inside its profile comprises plastic deformation of the walls of a screw groove preliminarily manufactured by means of a thread-rolling tool (2). The screw groove is at least a double-start screw groove with its lead being equal to the pitch of the manufactured screw thread, provided that one of the starts is used as a guide for the thread-rolling tool (2), which, in the course of the plastic deformation of the walls of the screw groove, transforms each of the other starts into a closed helical cavity (3) located inside the screw profile. The thread-rolling tool for implementing this method comprises threading rolls (7) with an annular rifling, which are evenly spaced along a circumference and fixed in a casing (4) provided with a starting part (5). The tool comprises as well groove-forming rolls (6) with an annular rifling, which are evenly spaced along the circumference of the casing (4) and mounted between the starting part (5) of the casing (4) and the threading rolls (7), the pitch of the annular rifling of the groove-forming rolls (6) being equal to P/n, where P is the pitch of the manufactured screw thread and n2 is the number of starts of the screw groove.

TOROPOV G (SU)
KHITUN G (SU)
TSVIRKO G (SU)
MENYAILENKO A (SU)
SHAMENKO S (SU)
OLEINICHENKO V (SU)

PCT/SU1980/000118

February 19, 1981

June 30, 1980

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DN GORNYJ I IM ARTEMA (SU)
TOROPOV G (SU)
KHITUN G (SU)
TSVIRKO G (SU)
MENYAILENKO A (SU)
SHAMENKO S (SU)
OLEINICHENKO V (SU)

B21H3/08; (IPC1-7): B21H3/08

SU108253A1	1956-11-30
SU625824A1	1978-09-30

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