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Patent Searching and Data


Title:
PIERCING AND ROLLING METHOD FOR SEAMLESS METALLIC TUBE
Document Type and Number:
Japanese Patent JPH08215714
Kind Code:
A
Abstract:

PURPOSE: To prevent the generation of flaws on the outside of a shell due to miss roll and burning, to improve production efficiency and to extend performable range even when the thin-walled hollow shell is rolled at high expansion ratio by specifying the shape of the outer peripheral surface of a disk roll used at the time of piercing and rolling with inclined rolls.

CONSTITUTION: The shape of concave circular-arcuate groove of the outer peripheral surface which is the sliding face of a disk roll 3 to a material to be rolled is taken as a shape by which conditions of inequality I to inequality III are satisfied. The concave circular-arcuate groove 3a to be formed on the outer periphery of the disk roll 3 is constituted of two circular arcs of a circular arc on the rotatively entering side of the material to be rolled of a radius R1 of curvature and circular arc on the rotatively discharging side of the material to be rolled of a radius R2 of curvature which have centers of curvature on the reference line Y-Y which is situated in the part where the condition of 0.8≤b/a≤1.2 is satisfied, the R1 and R2 satisfy the inequality I and piercing is executed using the groove which is formed into the circular arc groove having the shape the values of the R1 and R2 of which satisfy the inequalities I, II in the relationship with a radius R3 of the solid billet of a base stock.


Inventors:
YAMAKAWA TOMIO
SHIMODA KAZUMUNE
Application Number:
JP3188395A
Publication Date:
August 27, 1996
Filing Date:
February 21, 1995
Export Citation:
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Assignee:
SUMITOMO METAL IND
International Classes:
B21B19/04; B21B27/02; (IPC1-7): B21B19/04; B21B27/02
Attorney, Agent or Firm:
Morio Mori (1 outside)