JPS5561308A - Controlling method for elongation length of pipe in continuous elongator - Google Patents
Controlling method for elongation length of pipe in continuous elongatorInfo
- 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
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.
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)
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 |
-
1978
- 1978-10-31 JP JP53135070A patent/JPS6012138B2/en not_active Expired
Cited By (1)
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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