Warm rolling facility for steel strip coils

Details Warm rolling facility for steel strip coils Warm rolling facility for steel strip coils

1991-12-19

1993-03-23

Larson, Lowell A.

Metal deforming

By use of roller or roller-like tool-element

With modification or control of temperature of work, tool or...

72200, B21B 2706

Patent

active

051953447

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to a warm rolling facility suitable to thin plates, especially with less workability.


BACKGROUND OF THE INVENTION

Recently, from standpoint of saving natural sources and energy, small sizings and high efficiency of electromagnetic or electronic parts have been demanded, and soft magnetic property, especially Si steel sheets having excellent iron loss have been also required. It is known that soft magnetic properties of Si steel sheets are improved with increasing of addition of Si and exhibit the maximum permeability at about 6.5 wt %, and since natural electric resistance is high, the iron loss is made small. In this kind of steel sheets, if the Si content is less than 4.0 wt %, workability is abruptly worsened, and therefore it has been impossible to produce high Si steel sheets in industrial scales by the rolling process, but it has been found that the warm rolling could be performed on the thin steel sheets through studies.
However, ordinarily used rolling facilities could not secure bending deformation of the coil or temperatures of the materials, and are difficult to roll the high Si steel sheets. For example, Japanese Patent Application Laid-Open No.135,407/86 proposed a facility protecting from an uncoiling reel to first rolling stands with a warming wall, but this facility could not prevent cracks by bending at the deflector rolls or by rolling.
This invention has been developed in view of problems involved with the prior art, and is to provide a warm rolling facility which may carry out the rolling efficiently without causing cracks in thin steel sheets with less workability.


DISCLOSURE OF THE INVENTION

For accomplishing this object of the invention, the strip is subjected to reverse rollings between tension reels, while it is always maintained at determined temperatures, whereby the facility could prevent cracks or breakages by bending and working. The facility is constructed with a rolling machine, tension reels disposed respectively at an inlet side and an outlet side of the rolling machine, deflector rolls between each of the tension reels and the rolling machine. The tension reel is positioned in a warming furnace having a heating means, and the rolls and the deflector rolls are provided with heating means for the rolls. Further, the rolling machine is provided at the inlet and the outlet with heating apparatuses for the strip.
In this rolling facility, the strip is undertaken with the reverse rollings, and in a case of high Si steel sheet, the hot rolled coil of 2 mm thickness is ordinarily rolled to thickness of about 0.5 mm. The rolls are preheated about 200.degree. C. (surface temperature) by heating means, and the defector rolls are also always preheated at about 200.degree. C. (surface temperature) by heating means. The strip coil is kept at the temperatures between about 300.degree. and 600.degree. C. in the warming furnace. The strip which is uncoiled from one of the tension reels and sent from the warming furnace, passes the deflector rolls and is rolled. Since the deflector rolls are heated, the strip passing thereon is avoided from decreasing of temperature, so that the strip is checked from bending or breakage at the deflector rolls. The strip passing the deflector rolls is heated for securing the temperature of the strip to be rolled and goes into the rolling machine. Since the rolls are preheated, the strip is controlled to the minimum from escaping of the temperature at the rolls. The strip from the rolls is heated by the heating means disposed at the outlet of the rolls, and passes the heated deflector rolls and is coiled by another tension reel within the warming furnace. The strip is heated and maintained at the temperatures about from 200.degree. to 600.degree. C., and thus the rolling is repeated on the strip to reduce it to a thin sheet.
The strip is always maintained above the determined temperature (for example, more than 200.degree. C.) during the reverse rolling, and the rolling is carried out as exactly avoiding c

REFERENCES:
patent: 1912129 (1933-05-01), Detwiler
patent: 2088241 (1937-07-01), Irvin
patent: 2376240 (1945-05-01), Ferm
patent: 2658741 (1953-11-01), Schmidt et al.
patent: 3606778 (1971-09-01), Bomberger
patent: 3613425 (1971-10-01), Roberts
patent: 3616669 (1971-11-01), Shumaker
patent: 4291558 (1981-09-01), Santali et al.
patent: 4580428 (1986-04-01), Brettbacher et al.
patent: 4938049 (1990-07-01), Masuda et al.

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