JP2012024817A5

JP2012024817A5 -

Info

Publication number: JP2012024817A5
Application number: JP2010166447A
Authority: JP
Filing date: 2010-07-23
Publication date: 2013-07-18
Anticipated expiration: 2030-07-23

Description

本発明は、連続鋳造時に、鋳型からピンチロールにより引抜かれたストランドを、鋳込条件情報に基づいて算出される補正係数により公称単位重量を補正して得られる、所要の請求重量を有する請求長さの鋼片に切断する鋼片の切断方法において、前記ストランドの凝固が完了している連続鋳造機の下流位置に、固定ポイントを設定すると共に、前記鋼片の切断指示長の計算に、切断対象の鋼片に対応する位置のストランドが、前記鋳型から前記固定ポイントを通過する迄の機内滞留時間を反映させることにより、前記課題を解決したものである。 The present invention provides a bill length having a required bill weight obtained by correcting a nominal unit weight of a strand drawn by a pinch roll from a mold at the time of continuous casting using a correction coefficient calculated based on casting condition information. In the method of cutting a steel piece to be cut into a steel piece, a fixing point is set at a downstream position of the continuous casting machine where the solidification of the strand has been completed, and the cutting is calculated for the cutting instruction length of the steel piece. The problem is solved by reflecting the staying time in the machine until the strand at the position corresponding to the target steel slab passes through the fixed point from the mold.

本発明によれば、鋳型から引抜かれたストランドの外形（厚さ）に影響する機内滞留時間を考慮して切断時の切断指示長を計算するようにしたので、メニスカス部の鋳造速度のみならず、機内の速度履歴を反映させることができ、凝固完了ポイントの変化や鋳片温度差による重量偏差を低減させて、一段と請求重量に見合った鋼片長さに精度良く切断することができるようになった。 According to the present invention, the cutting instruction length at the time of cutting is calculated in consideration of the residence time in the machine that affects the outer shape (thickness) of the strand drawn from the mold, so that not only the casting speed of the meniscus part is calculated. It is possible to reflect the speed history in the machine, reduce the weight deviation due to the change in the solidification completion point and the slab temperature difference, and more accurately cut to the billet length corresponding to the requested weight. It was.

Claims

A billet of billed length having a required billing weight obtained by correcting a nominal unit weight of a strand drawn by a pinch roll from a mold during continuous casting with a correction coefficient calculated based on casting condition information In the cutting method of the steel piece to be cut into
At the downstream position of the continuous casting machine where the solidification of the strand is completed, a fixed point is set,
Cutting the steel slab characterized by reflecting the staying time in the machine until the strand at the position corresponding to the steel slab to be cut passes through the fixing point in the calculation of the cutting instruction length of the steel slab Method.

The reflection of the residence time in the machine is expressed by the following formula: β = a · α ² + b · α + c
α: Residence time in the machine (sec.)
a, b, c: Parameters obtained by coefficients: The following formula multiplied by β Cutting instruction length (hot value) =
Requested slab length (cold value) x hot correction factor x β
It implement | achieves by these, The cutting method of the steel piece of Claim 1 characterized by the above-mentioned.

The strand at the position corresponding to the slab to be cut is subdivided into blocks of a predetermined length, and after each block passes the meniscus in the mold, the rear end is the fixed point. The method of cutting a steel slab according to claim 1 or 2, characterized in that a passage time until passing through the slab is measured, and an average value of the passage times measured for all blocks is set as an in-machine residence time of the slab. .

The steel piece cutting method according to claim 1, 2 or 3, wherein the fixing point is the pinch roll or the machine end position immediately before the pinch roll.