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Rolling method and rolling device for differential thickness steel sheet

A technology for steel plates and uniform thickness, which is applied to the rolling of non-uniform thickness steel plates and the field of rolling devices, can solve the problems of reducing the yield of thick steel plates and allocating excess length, and achieves the effect of improving the yield of finished products.

Active Publication Date: 2015-12-23
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] Therefore, Patent Document 1 cannot accurately calculate the remaining lateral area between the actual lateral area (actual lateral area) and the estimated lateral area (estimated lateral area). There is a concern that the yield of uneven thickness steel plate will decrease

Method used

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  • Rolling method and rolling device for differential thickness steel sheet
  • Rolling method and rolling device for differential thickness steel sheet
  • Rolling method and rolling device for differential thickness steel sheet

Examples

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Embodiment Construction

[0032] Hereinafter, modes for implementing the present invention (hereinafter, referred to as embodiments) will be described in detail with reference to the drawings.

[0033] figure 1 A reversible rolling mill 1 for obtaining uneven-gauge steel plates by rolling a slab S is shown.

[0034] The rolling mill 1 includes vertical work rolls 2 and vertical backup rolls 3 . The gap (roll gap) between the upper and lower work rolls 2 is adjusted by the gap changing mechanism 4 . The opening degree changing mechanism 4 sets and changes the opening degree of each pass according to an opening degree instruction from the controller 5 . The rolling load during rolling is detected by a load cell 6 , and the detected value is output to the controller 5 . Reference numeral 8 is a plate width meter (plate width meter) for measuring the plate width of the thick part Y mentioned later. Reference numeral 9 denotes table rolls that convey the slab S toward the work rolls 2 . A first pulse g...

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Abstract

Provided is a method for rolling differential thickness steel sheets, the method being capable of improving the yield of differential thickness steel sheets. The excess length of the thin-walled section is calculated (Step (ST7)) on the basis of the observed cross-sectional area of the thick-walled section calculated at the time of a primary rolling (Step (ST1)). Next, the rolled length of the thin-walled section is calculated (Step (ST8) - Step (ST12)) so that the excess cross-sectional area is distributed between the thick-walled section and the thin-walled section in accordance with the excess length of the thin-walled section. Then, a secondary rolling is performed using the calculated rolled length (LX(Sx)) for the thin-walled section.

Description

technical field [0001] The present invention relates to a rolling method and rolling apparatus for producing a differential thickness steel plate (differential thickness steel plate) having a thick portion and a thin portion having a plate thickness different from the thick portion in a longitudinal direction. Background technique [0002] When manufacturing a thick plate, rolling is generally performed by distributing a plurality of orders for a product steel plate having the same thickness on one slab. However, in the case of small batches of product steel plates and insufficient delivery time, when no suitable combination object can be found, rolling is performed with a low yield. [0003] On the other hand, uneven-gauge rolling in which a plurality of product steel plates having different thicknesses are distributed to one slab and rolled thereby increases the degree of freedom in combination and realizes low yields that avoid rolling. [0004] Among the slabs to which ...

Claims

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Application Information

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IPC IPC(8): B21B1/38B21B37/70
CPCB21B1/38B21B2205/02
Inventor 藤本健资大原孝幸高桥清一
Owner JFE STEEL CORP
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