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Title:
CONTROLLING METHOD OF SIZE OF FINISHED TUBE OF SIZER
Document Type and Number:
Japanese Patent JPS60127015
Kind Code:
A
Abstract:

PURPOSE: To roll a tube for which allowable limit of inner diameter is designated at high accuracy by determining objective outer diameter at the time of rolling from thickness after sizer rolling estimated from actual result of size of preceding process of the sizer and target value of inner diameter of exit side of the sizer obtained from allowable difference of inner diameter of the finished tube.

CONSTITUTION: Target value of inner diameter (d) is determined from allowable difference of inner diameter of the finished tube 22. Then, initial value D0 of objective outer diameter is determined by formula I from target thickness value (t) determined from standard value or allowable difference of thickness. When the value D0 differs from objective outer diameter D1 calculated from estimated value of thickness, estimated value of thickness is determined again substituting the value D1, and the objective outer diameter is corrected by the formula I . To be concrete, the size of preceding process of the sizer is adopted. Then, thickness t1 at the timer of sizer rolling is estimated by specified formula using the value D0, and made to the first objective outer diameter by formula II. Then, it is judged whether the difference between D0 and D1 becomes less than a specified value k determined according to accuracy of outer diameter control of the sizer, and if the result is no, correction is made again, and if yes, sizer rolling is performed making Dn at that time objective outer diameter.


Inventors:
MASUDA TOSHIICHI
Application Number:
JP23406883A
Publication Date:
July 06, 1985
Filing Date:
December 12, 1983
Export Citation:
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Assignee:
KAWASAKI STEEL CO
International Classes:
B21B17/14; B21B37/00; B21B37/16; B21B37/78; B21B19/10; (IPC1-7): B21B19/10; B21B37/00
Attorney, Agent or Firm:
Satoshi Takaya



 
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