Warm rolling method for high silicon steel strips

Details Warm rolling method for high silicon steel strips Warm rolling method for high silicon steel strips

1988-12-20

1990-07-03

Combs, E. Michael

Metal deforming

By use of roller or roller-like tool-element

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

72700, B21B 122, B21B 132, B21B 300

Patent

active

049380494

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

This invention relates to a warm rolling method for high silicon steel strips.


BACKGROUND OF THE INVENTION

Recently, from standpoint of saving natural sources and energy, small sizes 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 4.0 wt% or more, 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.
However, the warm rolling is restricted as that the high Si steel sheet is poor in bending processing and could not be welded at room temperatures. When the high Si steel sheet is going to warm-roll (200.degree. to 600.degree. C.) and if the rolls are cool, the steel strip passing therebetween is chilled and invites cracks by working. Therefore the rolls should be preheated.
It was found through the inventors' investigations that the high Si steel strip could be rolled efficiently with by reversings, and warming between each passes of the reverse rollings by means of the tension reels disposed within the warming furnaces, and further magnetic property could be satisfied therein by the recovery treatment between passes in the warming furnaces. In the rolling, the steel strip should be coiled completely on one of the tension reels in each step of the reverse rollings.


DISCLOSURE OF THE INVENTION

The invention has been developed in view of such problems, and each end of the steel strip is connected with a leader strip of materials which have excellent cold and excellent warm workability. The ends of the leader strips are connected to tension reels for performing warm rolling on the steel strip.
According to the invention, because the leader strip has good workability, it can be exactly secured to the tension reel.
The leader strips can be used for preheating the rolls to prevent the strip from escaping of the temperature therefrom, which would happen by contacting cool rolls. The leader strips are heated and passed through the rolls, so that the rolls are preheated, and subsequently the steel strip is warm-rolled.
The steel strip is rolled by the warm reversings by means of the tension reels within the warming furnaces. For carrying out the recovery treatment on the steel strip by warming it between each passes of the reverse rollings, the lengthes of the leader strips are made larger than the distance between the tension reels. Thereby, the steel strip can be coiled completely on the tension reel after having finished the passes, so that the recovery may be effected on the steel strip in the full length.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows schematically one embodiment of the invention;
FIG. 2 shows the practice of the invention more concretely; and
FIGS. 3 and 4 show connections of the steel strip and the leader strip.


MOST PREFERRED EMBODIMENT FOR PRACTISING THE INVENTION

In FIG. 1, 1A,1B are tension reels, 2 is a rolling machine, 3 is rolls, 4 represents deflectors, 5 represents a high Si steel strip (hereinafter referred to as "steel strip").
Each end of the steel strip 5 is connected with a leader strip 6 comprising materials (steel, iron or alloys) suitable for cold or warm working, such as SUS or SS. The leader strip should have the same thickness as the steel strip 5, and one end of each leader strip is secured to one of the tension reels 1A, 1B at ends by tightening bolts.
The leader strips 6 can be used for preheating the rolls 3. The leader strips 6 are heated together with the steel strip 5 and passed between the rolls 3 so that the leader strips 6 preheat the ro

REFERENCES:
patent: 1081370 (1913-12-01), Cunningham
patent: 1965559 (1934-07-01), Goss
patent: 1992039 (1935-02-01), Reinhardt
patent: 3009176 (1963-07-01), Hall et al.
patent: 3606778 (1971-09-01), Bomberger
patent: 4291558 (1981-09-01), Santoli et al.
patent: 4430874 (1984-02-01), Tippins et al.

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