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Title:
MANDREL DEVICE OF PLANETARY TYPE SKEW ROLLING MILL FOR PRODUCING SEAMLESS STEEL PIPE
Document Type and Number:
Japanese Patent JPS58215209
Kind Code:
A
Abstract:

PURPOSE: To extend considerably the life of a mandrel by moving the mandrel inserted into a rough pipe together with the rough pipe until the rolling work is finished thereby preventing the mandrel from receiving local overheating by rolling.

CONSTITUTION: A rough pipe A which is formed to a hollow pipe is conveyed forward to the inlet side of the guide tube 2 of a planetary type skew rolling mill B and the mandrel 3 mounted at the forward end of a mandrel bar 6 is inserted loosely and supported in the pipe A. A carriage 5 is moved in this state on a supporting device 4 and the mandrel 3 is advanced by the bar 6 to feed the pipe A into the tube 2. The pipe A is subjected to a rolling reduction by three circular conical rolls and the mandrel 3 continues to advance and moves together with the pipe A until the operation is completed. The pipe A which is completed of the reduction and elongation is moved to the next stage. The life of the mandrel 3 is extended considerably without receiving local heating.


Inventors:
NOMA TETSUO
Application Number:
JP9800682A
Publication Date:
December 14, 1983
Filing Date:
June 07, 1982
Export Citation:
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Assignee:
KAWASAKI HEAVY IND LTD
International Classes:
B21B19/06; B21B25/02; (IPC1-7): B21B25/00
Attorney, Agent or Firm:
Yoshihiro Tsunoda



 
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