Structural body and method for cold rolling
AssigneeHaruna Co., Ltd.
InventorTsuyoshi Asano
Life of this patent
Estimating the term…
Abstract
A cold rolling method for performing a series of processes including rolling and cutting of a workpiece in succession, wherein tensile forces are applied to the workpiece during processes from the rolling to straightening. To eliminate the processes of annealing, pickling and chemical conversion coating to accomplish cost reduction and energy saving. To reduce material loss to 5% or lower. To decrease dimensional variation among workpieces (within 0.05 mm or lower) and improve straightness of the rolled workpiece including end parts thereof after cutting (final precision of 0.1 mm). To decrease lead time necessary to process a base material before it is introduced into the rolling line to reduce running and equipment costs.
Claims10
A cold rolling system comprising:
- a first rolling mill providing a first rolling reduction and comprising first non-powered turks-head rolls and first powered turks-head rolls;
- a second rolling mill providing a second rolling reduction which is larger than said first rolling reduction, and comprising second non-powered turks-head rolls and second powered turks-head rolls, said second rolling mill being disposed opposite said first rolling mill;
- means for applying a first tensile force to that part of a workpiece which passes through said first rolling mill;
- means for applying a first tensile force to that part of said workpiece which passes through said second rolling mill;
- means for applying a second tensile force to that part of said workpiece which has passed through said first rolling mill and which is to be fed to said second-rolling mill;
- means for applying a third tensile force to that part of said workpiece which has passed through said second rolling mill;
- a first straightening device disposed upstream of said first rolling mill for straightening said workpiece;
- means for applying a fourth tensile force to that part of said workpiece which passes through said first straightening device;
- a second straightening device disposed downstream of said second rolling mill for straightening said workpiece;
- means for applying a fourth tensile force to that part of said workpiece which passes through said second straightening device;
- means for applying a fifth tensile force to that part of said workpiece which is positioned between said first rolling mill and said first straightening device;
- a cutting device, positioned downstream of said second straightening device and running at a speed which is the same as a line speed of said workpiece, for cutting said workpiece into a desired length;
- and
- means for applying a sixth tensile force to that part of said workpiece which passes through said cutting device.
A cold rolling method for performing straightening, cold rolling, straightening and cutting of a workpiece in succession, comprising:
- a step of applying to a workpiece a first tensile force determined by an area reduction rate of free rolls of non-powered turks-head rolls according to a drawing force of powered turks-head rolls;
- a step of applying to said workpiece a second tensile force determined by a rotation ratio of driving rolls of said powered turks-head rolls;
- a step of applying to said workpiece a third tensile force determined by a rotation ratio between said driving rolls of said powered turks-head rolls and feed pinch rolls disposed upstream of a second straightening device;
- a step of applying to said workpiece a fourth tensile force determined by a rotation ratio between lateral and vertical levelers constituting a straightening device and feed pinch rolls disposed upstream and downstream of said levelers;
- a step of applying to said workpiece a fifth tensile force determined by a rotation ratio between said driving rolls of said first powered turks-head rolls and said vertical and lateral levelers constituting said straightening device;
- and
- a step of applying to said workpiece a sixth tensile force determined by a rotation ratio of feed pinch rollers disposed upstream and downstream of a cutting device.
Dependencies are inferred from the claim text.