Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
PRODUCTION OF SEAMLESS PIPE AND PLUG TO BE USED FOR ITS EMBODIMENT
Document Type and Number:
Japanese Patent JPS58167004
Kind Code:
A
Abstract:

PURPOSE: To produce a seamless pipe which has less surface defects such as chatter mark or the like easily by piercing, expanding or drawing a material to be rolled by using a plug which is split into plurality in the axial centerline direction and of which the split parts are formed rotatable independently from each other.

CONSTITUTION: A plug 3 which is formed of a rolling part 31 of an approximately circular truncated cone shape having a round forward end part, a reeling part 32 of an approximately circular truncated cone shape continuous with said part and a relief part 33 having a reduced base part continuous with said part is divided to a part 34 on the forward end side and a part 35 on a base end side, and both parts are constituted rotatably independently around the respective axial centerlines and are connected pivotally to a mandrel M in a skew rolling mill which produces a seamless pipe by penetrating the above-mentioned plug 3 into the central part of a round steel billet B, which is a material to be rolled, while moving the same progressively in an arrow direction by means of a pair of rolling rolls 1l, 1r each provided with a gorge part 11 having a max. diameter, and an inlet surface 12 assuming a circular truncated cone shape and an outlet surface 13 on both sides thereof, thereby piercing a hole in the billet 2 and forming a hollow shell H.


Inventors:
MIYAMAE YUKIHIKO
SHIMODA TAKESHI
Application Number:
JP4929182A
Publication Date:
October 03, 1983
Filing Date:
March 26, 1982
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
SUMITOMO METAL IND
International Classes:
B21B19/04; B21B25/00; (IPC1-7): B21B19/04; B21B25/00
Attorney, Agent or Firm:
Tono Kono



 
Previous Patent: JPS58167003

Next Patent: PLUG MILL ROLLING METHOD