JPS54126653A - Controlling method for rolling length of steel pipe in mandrel mill - Google Patents
Controlling method for rolling length of steel pipe in mandrel millInfo
- Publication number
- JPS54126653A JPS54126653A JP3519978A JP3519978A JPS54126653A JP S54126653 A JPS54126653 A JP S54126653A JP 3519978 A JP3519978 A JP 3519978A JP 3519978 A JP3519978 A JP 3519978A JP S54126653 A JPS54126653 A JP S54126653A
- Authority
- JP
- Japan
- Prior art keywords
- rolling length
- outer diameter
- length
- mandrel
- correction factor
- 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.)
- Pending
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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Metal Rolling (AREA)
Abstract
PURPOSE:To reduce the scatter of the rolling length, and to control the rolling length to constant, by actually measuring the length and outer diameter of the steel pipe for every mandrel bar, by finding the correction factor for the rolling length from the actually measured value and the aim value, and by changing the roll gap correspondingly to this correction factor. CONSTITUTION:The outer diameter dn and the rolling length ln of each rolled pipe P1...Pn are automatically measured by the outer diameter measuring device 3 and the rolling length measuring device 4, and are successively inputted to the central processing unit (cpu) 5 and are memorized there, under the condition that mandrel bars M1...Mn are extracted to the exit side of the mandrel mill 1. The cpu 5 operates the correction factor from the actually measured outer diameter d1, the rolling length ln, the aim outer diameter D and the aim rolling length L. A correction is given to the roll gap (g) of each mandrel bar M1...Mn according to the correction factor. The corrected foll gap Gn is memorized against the mandrel mill 1 for the second and following passes of each mandrel bar M1...Mn; and the pipe of constant length is manufactured depending on the corrected roll gap Gn.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3519978A JPS54126653A (en) | 1978-03-27 | 1978-03-27 | Controlling method for rolling length of steel pipe in mandrel mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3519978A JPS54126653A (en) | 1978-03-27 | 1978-03-27 | Controlling method for rolling length of steel pipe in mandrel mill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS54126653A true JPS54126653A (en) | 1979-10-02 |
Family
ID=12435188
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3519978A Pending JPS54126653A (en) | 1978-03-27 | 1978-03-27 | Controlling method for rolling length of steel pipe in mandrel mill |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS54126653A (en) |
-
1978
- 1978-03-27 JP JP3519978A patent/JPS54126653A/en active Pending
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