CS196455B1 - Uniform rolling stand duo for rolling the blooms and profiles under heat - Google Patents

Description

The present invention relates to a duo DC rolling mill for hot rolling of billets and profiles, and to a method of rolling material of constant non-stick height while saving energy and using less weight machinery.

In the rolling of the preforms and profiles on a duo DC rolling mill where the diameter of each individual roll mill roll is greater than the height of the roll material entering the rollers, the roll material does not run out in the roll gap and at the end of the roll overtaking of rolled material. Under this geometric relationship, the diameter of each individual roll stand is greater than twice the tapping height of the rolled material. In the case where the diameter of each individual roll stand is smaller than the tapping height of the rolled material, at the beginning of the engagement arc the rolled material is overtaken in the gap between the rolls and the rolled material does not run at the end of the engagement arc. In practice, this geometric relationship is used only for planetary rolling stands and forging rolling stands with crank mechanisms. A disadvantage of both of these structural arrangements of rolling stands is that slip occurs between the rolls of the rolling stands and the material to be rolled, so that the mass of the rolling stands, the rolling force used and the torque need to be increased and hence the demands on electric drives of the rolling stands.

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These disadvantages of the prior art are overcome by the present invention, which is concerned with a duo-gauge mill for the rolling of billets and heat profiles. It is an object of the present invention that the diameter of each individual roll stand is equal to 0.8 to twice the fill height of the rolled material.

The advantage of the duo mill-sized mill stand according to the invention is that it is possible to roll material of constant fill height with a cylinder of smaller diameter than hitherto, so that it exerts a proportionally less rolling force and less rolling torque. This brings considerable savings on machinery, which can be constructed with a lower total weight, also saves electrical energy and saves the material of the rollers because of their lesser weight. Hot rolling of billets and profiles on the rolling mill according to the invention is non-slip when it comes to the movement of the rolled material in the gap between the rolls of the rolling mill. This rolling mill allows the material to be rolled by a roller several times smaller than usual.

The duo uniform rolling mill for hot rolling of billets and profiles can advantageously be installed as a mill and forming mill for the abovementioned properties! roll during the casting of bars cast during continuous casting, where there is an optimum geometric relationship between the diameter of each individual roll and the fill height of the rolled material, which are equal to each other.

Claims (1)

SUBJECT OF THE INVENTION A duo DC mill for hot rolling of billets and profiles, characterized in that the diameter of each individual mill stand is equal to 0.8 to twice the feed height of the material to be rolled.