Claims
- 1. A method for the continuous straightening of metal strips with a tensioning device having a first tensioning roll and a second tensioning roll, the method comprising the steps of:
- passing the metal strip over the first tensioning roll in a first rotational direction;
- passing the metal strip over the second tensioning roll in a rotational direction opposite to that of said first rotational direction;
- forming a stretcher levelling section between the first and second tensioning rolls such that the metal strip is curved in a first direction by the first tensioning roll and in a second direction by the second tensioning roll;
- selectively operating the first tensioning roll at a first rotational speed; selectively operating the second tensioning roll at a second rotational speed different from said first rotational speed so as to selectively cause a longitudinal stretching in said stretcher levelling section plastically elongating the metal strip throughout its entire cross-section; and
- subjecting the metal strip to a stretching and bending in a stretching and bending device by feeding the metal strip through stretching and bending rolls at a location longitudinally separate from the first and second tensioning rolls, said metal strip being continuously passed through said stretcher levelling section and said stretching and bending device.
- 2. A method according to claim 1, wherein: said step of subjecting the metal strip to a stretching and bending in a stretching and bending device is carried out subsequent to said forming a stretcher levelling section between the first and second tensioning rolls.
- 3. A method according to claim 1, wherein: said step of subjecting the metal strip to a stretching and bending in a stretching and bending device is carried out prior to said step forming a stretcher levelling section between first and second tensioning rolls.
- 4. A method according to claim 1, wherein; said stretching in said stretcher levelling section is carried out at a stretching ratio of between 0.2 to 0.3 percent.
- 5. A method according to claim 1 wherein: said stretching and bending device comprises rolls being of a diameter smaller than the diameter of said tensioning rolls.
Priority Claims (1)
Number |
Date |
Country |
Kind |
3514357 |
Apr 1986 |
DEX |
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Parent Case Info
This application is a continuation of application Ser. No. 776,435, filed Sept. 16, 1985, abandoned.
US Referenced Citations (8)
Foreign Referenced Citations (3)
Number |
Date |
Country |
455770 |
Jan 1974 |
SUX |
712173 |
Jan 1980 |
SUX |
631081 |
Oct 1949 |
GBX |
Continuations (1)
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Number |
Date |
Country |
Parent |
776435 |
Sep 1985 |
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