JPS5465147A - Hydraulic screw down device for rolling mill - Google Patents
Hydraulic screw down device for rolling millInfo
- Publication number
- JPS5465147A JPS5465147A JP13079677A JP13079677A JPS5465147A JP S5465147 A JPS5465147 A JP S5465147A JP 13079677 A JP13079677 A JP 13079677A JP 13079677 A JP13079677 A JP 13079677A JP S5465147 A JPS5465147 A JP S5465147A
- Authority
- JP
- Japan
- Prior art keywords
- controlling valve
- screw down
- feedback
- down device
- responsiveness
- 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
- 238000005096 rolling process Methods 0.000 title abstract 3
- 230000004043 responsiveness Effects 0.000 abstract 3
- 101100328887 Caenorhabditis elegans col-34 gene Proteins 0.000 abstract 2
- 230000003321 amplification Effects 0.000 abstract 2
- 238000003199 nucleic acid amplification method Methods 0.000 abstract 2
Landscapes
- Control Of Metal Rolling (AREA)
Abstract
PURPOSE:To contrive the improvement of responsiveness and accuracy of the screw down device, by employing the multistage amplification type flow-rate-controlling valve as the controlling valve, and by varying the feedback gain of the spool correspondingly to the working condition of the rolling mill. CONSTITUTION:The multistage amplification type flow-rate-controlling valve is employed as the controlling valve for the hydraulic screw down device. When the rolling is worked, the switches 13, 13, of feedback gains 11A, 12A, are closed so as to form the feedback of 11A, 12A. Hereby, the rated flow rate of controlling valve becomes small, and its responsiveness becomes large; in the screw down device, the maximum reducing speed of the screw down ram 4 is small but the responsiveness is fast, so that a good control on the accuracy of sheet thickness becomes possible. When a fast reducing speed of the screw down ram 4 is necessary, the feedback circuit 12A is put off and 12B is put on. Hereupon, in the case that the gain of the controlling valve greatly varies and the stability of the servo system tends to be damafed, the feedback gain circuit 11A is switched to 11B.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13079677A JPS5465147A (en) | 1977-11-02 | 1977-11-02 | Hydraulic screw down device for rolling mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13079677A JPS5465147A (en) | 1977-11-02 | 1977-11-02 | Hydraulic screw down device for rolling mill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5465147A true JPS5465147A (en) | 1979-05-25 |
Family
ID=15042890
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13079677A Pending JPS5465147A (en) | 1977-11-02 | 1977-11-02 | Hydraulic screw down device for rolling mill |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5465147A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5872204A (en) * | 1981-10-23 | 1983-04-30 | Kayaba Ind Co Ltd | Automatic amplification gain regulating device for electric hydraulic servo type pressure generating device |
-
1977
- 1977-11-02 JP JP13079677A patent/JPS5465147A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5872204A (en) * | 1981-10-23 | 1983-04-30 | Kayaba Ind Co Ltd | Automatic amplification gain regulating device for electric hydraulic servo type pressure generating device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A131 | Notification of reasons for refusal |
Effective date: 20050614 Free format text: JAPANESE INTERMEDIATE CODE: A131 |
|
| A601 | Written request for extension of time |
Effective date: 20050914 Free format text: JAPANESE INTERMEDIATE CODE: A601 |
|
| A602 | Written permission of extension of time |
Effective date: 20051024 Free format text: JAPANESE INTERMEDIATE CODE: A602 |
|
| A313 | Final decision of rejection without a dissenting response from the applicant |
Free format text: JAPANESE INTERMEDIATE CODE: A313 Effective date: 20060123 |
|
| A02 | Decision of refusal |
Effective date: 20060228 Free format text: JAPANESE INTERMEDIATE CODE: A02 |