JPS5561308A - Controlling method for elongation length of pipe in continuous elongator - Google Patents

Controlling method for elongation length of pipe in continuous elongator

Info

Publication number
JPS5561308A
JPS5561308A JP13507078A JP13507078A JPS5561308A JP S5561308 A JPS5561308 A JP S5561308A JP 13507078 A JP13507078 A JP 13507078A JP 13507078 A JP13507078 A JP 13507078A JP S5561308 A JPS5561308 A JP S5561308A
Authority
JP
Japan
Prior art keywords
rolling pass
pipe
sectional area
speed ratio
peripheral speed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP13507078A
Other languages
Japanese (ja)
Other versions
JPS6012138B2 (en
Inventor
Takeo Yamada
Chihiro Hayashi
Koji Yoshioka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SUMITOMO KAINAN KOKAN KK
Nippon Steel Corp
Original Assignee
SUMITOMO KAINAN KOKAN KK
Sumitomo Metal Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SUMITOMO KAINAN KOKAN KK, Sumitomo Metal Industries Ltd filed Critical SUMITOMO KAINAN KOKAN KK
Priority to JP53135070A priority Critical patent/JPS6012138B2/en
Publication of JPS5561308A publication Critical patent/JPS5561308A/en
Publication of JPS6012138B2 publication Critical patent/JPS6012138B2/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/78—Control of tube rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/56—Elongation control

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)

Abstract

PURPOSE:To make the pipe length (elongation) after the elongation pass to be identical to the aim value, by regulating the rolls' peripheral speed ratio so as to specify the sectional area of pipe after undergoing the actual rolling pass, depending on the relation between the rolls' peripheral speed ratio during the rolling pass and the mean sectional area of pipe after the rolling pass, that is the relation previously determined for each mandrel. CONSTITUTION:The experimental rolling pass is previously executed with each mandrel by the elongator under the same rolling condition as the actual rolling pass in order to specify the relation between the peripheral speed ratio X and the mean sectional area A obtained by the roll No.1 of the final stand as shown by the full line. Even if different mandrels are employed, the inclination DELTAA/DELTAXn becomes constant approximately as shown by the broken line. During the actual rolling pass, the mean sectional area A1 after the elongation pass to obtain the aim elongation l1 is computed according to following formular depending on the actually measured weight W1 of the pipe blank. A=W/lrho (in which W is the weight of the pipe blank and rho is its specific gravity). After that, the peripheral speed ratio Xn1 corresponding to the sectional area A1 is obtained depending on above relation. The r.p.m. of rolls of each stand is controlled so as to execute the actual rolling pass at this rolls' peripheral speed ratio Xn1.
JP53135070A 1978-10-31 1978-10-31 Method for controlling the elongation length of a pipe in a continuous elongation rolling mill Expired JPS6012138B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP53135070A JPS6012138B2 (en) 1978-10-31 1978-10-31 Method for controlling the elongation length of a pipe in a continuous elongation rolling mill

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP53135070A JPS6012138B2 (en) 1978-10-31 1978-10-31 Method for controlling the elongation length of a pipe in a continuous elongation rolling mill

Publications (2)

Publication Number Publication Date
JPS5561308A true JPS5561308A (en) 1980-05-09
JPS6012138B2 JPS6012138B2 (en) 1985-03-30

Family

ID=15143148

Family Applications (1)

Application Number Title Priority Date Filing Date
JP53135070A Expired JPS6012138B2 (en) 1978-10-31 1978-10-31 Method for controlling the elongation length of a pipe in a continuous elongation rolling mill

Country Status (1)

Country Link
JP (1) JPS6012138B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60127014A (en) * 1983-12-12 1985-07-06 Kawasaki Steel Corp Control method of elongating length in drawing mill of pipe stock

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60127014A (en) * 1983-12-12 1985-07-06 Kawasaki Steel Corp Control method of elongating length in drawing mill of pipe stock

Also Published As

Publication number Publication date
JPS6012138B2 (en) 1985-03-30

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