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Patent Searching and Data


Title:
PIERCER BORING METHOD OF HARD-TO-WORK MATERIAL
Document Type and Number:
Japanese Patent JP2009066644
Kind Code:
A
Abstract:

To provide a piercer boring method of a hard-to-work material capable of preventing generation of inner flaw when performing the piercer boring of the hard-to-work material.

In the piercer boring method for manufacturing a seamless steel tube by rolling and boring a hard-to-work material by a piercer mill, the relationship between the material temperature and the hot deformation resistance ([MPa]) is expressed by formula (1), and relational formula (2) between the material temperature immediately before the boring (T[k]) and the material advancing speed during the boring (V[mm/sec]) when performing the piercer boring of the hard-to-work material is satisfied, preventing generation of inner flaw due to the overheat during the boring. [MPa]=Aexp(D/T[K])(d/dt)m ...(1), T[K]+(1+0.002V[mm/sec])K(T)T0 [K]...(2).


Inventors:
SAKAI TAKESHI
Application Number:
JP2007240547A
Publication Date:
April 02, 2009
Filing Date:
September 18, 2007
Export Citation:
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Assignee:
SANYO SPECIAL STEEL CO LTD
International Classes:
B21B19/04
Attorney, Agent or Firm:
Shiina Akira