JP4946018B2 - Flying shear cutting control device - Google Patents

Description

  The present invention relates to a flying shear which is installed in a rolling line such as a wire rod of a steel mill, a steel bar factory, etc., and performs crop cutting of the head or tail end of the rolled material during conveyance traveling and product division cutting, and in particular, a material to be cut. The present invention relates to a cutting control device for a flanged shear which can be cut accurately at a set position.

  FIG. 3 is a diagram showing a configuration of a conventional technique. Hereinafter, the configuration of the conventional technique will be described with reference to FIG. 1 indicates the rolling direction. Reference numeral 3 denotes a crop shear body provided with shear blades 4 on the outer peripheral surfaces of the respective drums arranged above and below across the rolling line. The drum rotation shaft of the crop shear body 3 is connected to the shear drive motor 6 through a speed reducer, and cuts the material to be cut (rolled material) 12 rolled from the rolling mill stand 2 with a set cutting length. The shear drive motor 6 is activated at every cutting timing, and the shear blade 4 is rotated in the shear rotation direction 5 to cut the material by a predetermined length. The shear drive motor 6 is controlled and driven via a drive device 8. Reference numeral 9 denotes blade activation timing calculation means, which counts the pulse signal of the detector 11 including a pulse generator attached to the drive shaft of the rolling mill stand 2 from the timing when the signal from the material detector 10 is input, and the material travels. In addition to tracking the distance, the start time of the shear drive motor 6 is generated by calculating the time / material travel distance required from the start of the shear to the cutting, and outputs it to the blade position control means 14. The blade position control means 14 outputs a predetermined speed reference to the drive device 8 to activate the shear blade 4 at the timing from the blade activation timing calculation means 9. Furthermore, the position (rotation angle) detection result of the shear blade 4 obtained by the detector 7 including a pulse generator of the shear drive motor 6 is input, and the position of the shear blade 4 after cutting is determined in advance. A speed reference is output to the drive device 8 so as to stop at a predetermined standby position. Reference numeral 16 denotes a cutting length setting means.

Ｌms ：材料検出器とシャー中心までの距離
Ｌset：材料の切断長さ(設定値)
Ｌs : シャーが起動して切断するまでの間に材料が進む距離
Ｌmsは設備上の絶対距離、Ｌsetは設定値であり、共に定数であるが、Ｌsはシャーが起動から材料を切断するまでの速度パターンにより以下のように演算される。図４は、以下の式（２）および式（３）を説明するための図で、横軸が、シャーが起動してからの経過時間、縦軸が、シャーブレードの速度を示している。

ここで、Ｖ：材料速度、Ｔ2：シャー起動から切断までの時間
材料の速度Ｖは、被切断材のサイズ、鋼種によって、異なった値になり、切断動作前に、事前にプリセットされる。あるいは、検出器１１によって、材料毎に実測することによって得られる。
シャー切断時、すなわち、シャーブレード４が材料に接触するタイミングにおいて、ブレードの速度は材料速度Ｖに対しては、一定のリード率をもった値ＫＶである必要がある。
したがって、シャーブレード起動後のシャー速度は、図４に示すパターンとなるので、シャー起動から切断までの時間Ｔ2は、（3）式で示される。

Ｌs：シャーが起動してから切断するまでに回転する距離(一定)
Ｖ ：材料速度(設定値)
Ｋ ：リード率（材料速度に対するシャー速度比率で設定値）
α ：シャーの加速度(一定)

(2)式、（3）式より

結論として、(1)式に(4)を代入すると以下(5)式となり、シャー駆動用電動機の起動タイミングを生成するＬcutの距離は、あらかじめスケジュールにより設定される速度Ｖの関数として演算されるようになっている。

従来の装置では、ブレードの待機位置は、被圧延材の速度が最大の場合において、切断点にブレードが到達するまでの時間にブレード速度が所定の速度ＫＶに到達するだけの加速距離を満足する条件が予め決定され、速度Ｖによらず、常に同じ位置に制御される。
すなわち、シャー起動から加速完了時間をＴ１とすると、

であるから、最大速度Ｖmaxとして、切断までの移動距離Ｌｓ、つまり待機位置は、（７）式の関係が成り立つように決められる。

このような制御方法においては、被切断材の速度Ｖが遅くなるに従い、切断までの時間Ｔ2は長くなる。
図４は、この状況を説明するための図であり、模式的に、被切断材の速度Ｖが、高速時、中速時、および低速時におけるブレード速度パターンを示している。このことは（３）式を参照することによっても、説明できる。すなわち、（３）式において Ｌｓは一定であり、また加速度αも一定である。またリード率は、速度Ｖによって、可変される場合もあるが、概ね一定と考えてよい。 したがって、速度Ｖが小さくなると 切断までの時間Ｔ２の値は大きくなることが判る。 FIG. 4 is a diagram for explaining the operation on the configuration of the prior art. In particular, the method for calculating the start timing in the blade start timing calculating means 9 is described.
As shown in FIG. 3, the shear blade 4 first waits for the workpiece 12 to be conveyed at a predetermined standby position 13. After the material detector 10 detects that the workpiece 12 has been transported, the material transport distance is tracked by a detector 11 comprising a pulse generator attached to the rolling mill stand 2, and the leading edge of the material is shown in FIG. When the material length Lcut from the material detector 10 to be shown is detected, the shear drive motor 6 is activated and cut to the set material length.
Here, Lcut for generating the start timing of the shear drive motor 6 is expressed by the equation (1).

Lms: Distance between material detector and shear center Lset: Cutting length of material (set value)
Ls: Distance that the material travels before the shear starts and cuts Lms is the absolute distance on the equipment, Lset is a set value, both are constants, but Ls is the time from when the shear starts to cut the material It is calculated as follows according to the speed pattern. FIG. 4 is a diagram for explaining the following formulas (2) and (3), in which the horizontal axis indicates the elapsed time since the shear is started, and the vertical axis indicates the speed of the shear blade.

Here, V: material speed, T2: time from shear start to cutting, the material speed V varies depending on the size of the material to be cut and the steel type, and is preset in advance before the cutting operation. Alternatively, it is obtained by actually measuring each material with the detector 11.
At the time of shear cutting, that is, at the timing when the shear blade 4 comes into contact with the material, the blade speed needs to be a value KV having a constant lead rate with respect to the material speed V.
Therefore, the shear speed after the shear blade is activated has the pattern shown in FIG. 4, and the time T2 from the shear activation to the cutting is expressed by the equation (3).

Ls: Distance to rotate from when the shear starts until it is cut (constant)
V: Material speed (set value)
K: Lead rate (set value by ratio of shear speed to material speed)
α: Shear acceleration (constant)

From equations (2) and (3)

In conclusion, substituting (4) into equation (1) yields equation (5) below, and the distance of Lcut that generates the start timing of the shear drive motor is calculated as a function of the speed V set in advance by the schedule. It is like that.

In the conventional apparatus, the standby position of the blade satisfies the acceleration distance that the blade speed reaches the predetermined speed KV in the time until the blade reaches the cutting point when the speed of the material to be rolled is maximum. The conditions are determined in advance and are always controlled to the same position regardless of the speed V.
That is, when the acceleration completion time from the start of the shear is T1,

Therefore, as the maximum speed Vmax, the movement distance Ls until the cutting, that is, the standby position is determined so that the relationship of the expression (7) is established.

In such a control method, the time T2 until cutting becomes longer as the speed V of the material to be cut becomes lower.
FIG. 4 is a diagram for explaining this situation, and schematically shows blade speed patterns when the speed V of the material to be cut is high speed, medium speed, and low speed. This can also be explained by referring to equation (3). That is, in the equation (3), Ls is constant and the acceleration α is also constant. The read rate may be varied depending on the speed V, but may be considered to be substantially constant. Therefore, it can be seen that the value of the time T2 until cutting increases as the speed V decreases.

  In such a conventional flying shear cutting control device, the shear blade activation timing is determined from the equation (5) based on the traveling speed of the material before the activation, but after the activation timing, the shear blade activation equation based on the equation (5) is determined. There are various error factors in the acceleration timing calculation value of the blade. Therefore, the cutting accuracy often becomes a problem with respect to the set cutting length, and various methods for improving the cutting accuracy have been proposed (for example, see Patent Document 1).

JP-A-7-178613

  However, since the cutting length is essentially controlled only by the start timing of the shear blade, there is a problem that if the material speed changes before the cutting after the starting, the error of the cutting length increases due to the influence. It was. In particular, when the workpiece speed V is low, in the conventional technique, the time T2 until cutting becomes long, and during this time, the workpiece is easily affected by fluctuations in the speed of the material to be rolled. There was a problem that the cutting length error was larger than the cutting accuracy. Moreover, since rolling at a low speed V has a large size (cross-sectional area) of the material to be cut, deterioration in cutting accuracy greatly affects the yield, and thus an apparatus for solving this problem has been required.

  The present invention has been made to solve the above-described problems. Mainly, when the speed V of the material to be cut is low, the material to be cut can be cut to a set cutting length with high dimensional accuracy. It aims at providing the cutting control apparatus of a flying shear.

The cutting control device for a flying shear according to the present invention includes a crop shear main body provided with a shear blade on the outer peripheral surface of each drum arranged above and below across a rolling line, and a shear drive motor connected to the rotating shaft of the drum. And a drive device for controlling and driving the shear drive motor, starting the shear drive motor at each cutting timing to cut the material to be cut rolled from the rolling mill stand with a set cutting length, and shear blade In the flying shear equipment that cuts the material to be cut by a predetermined length by rotating the shaft in the rotation direction, the start timing of the shear drive motor is calculated by calculating the time required from the start of the shear to the cutting and the travel distance of the material to be cut The blade activation timing calculating means for generating the blade and the timing from the blade activation timing calculating means To start the blade, output a predetermined speed reference to the drive device, input the shear blade position detection result, and stop the position of the shear blade after completion of cutting at a predetermined standby position determined in advance. Blade position control means that outputs a speed reference to the drive device, and according to the moving speed of the material to be cut, calculates the optimum shear blade standby position that can be accelerated at the shortest distance to the optimum cutting speed at that speed , Optimal blade standby position calculation means for controlling the standby position of the blade so that the standby position of the shear blade becomes the shortest optimum at the speed , and the blade activation timing calculation means provides the optimum blade standby from the optimal blade standby position calculation means. The blade activation timing is calculated using the position as the blade activation position, and the result is used to control the blade position. On the other hand, the blade position control means outputs a speed reference to the drive device so that the blade position after cutting stops at the optimum blade standby position output from the optimum blade standby position calculation means. The lower the cutting material speed, the shorter the time from activation to cutting .
That is, when the speed V of the material to be cut varies depending on the size of the rolled product, the shortest moving distance of the blade at the speed V is calculated or measured, and the blade position is adjusted so that the standby position of the shear blade is the shortest optimum at the speed V. Optimal blade standby position calculation means for controlling the standby position is provided.

  According to the present invention, since the device for controlling the standby position of the blade is provided so that the standby position of the shear blade is the shortest optimum, the cross-sectional area is large and even when the speed V that particularly requires cutting accuracy is low. In addition, control with high cutting length accuracy is possible.

Embodiment 1 FIG.
A first embodiment of the present invention will be described below with reference to FIG. 1 is a block diagram showing a flying shear cutting control apparatus according to Embodiment 1 of the present invention.
The first embodiment of the present invention is characterized in that an optimum blade standby position calculating means 15 is provided with respect to the prior art of FIG.
The optimum blade standby position calculating means 15 obtains an optimum blade standby position that can be accelerated at the shortest distance from the moving speed V of the material to be rolled 12 to the optimum cutting speed at that speed, and obtains the result as blade position control means 14 and Output to the blade activation timing calculation means 9. The blade position control means 14 outputs a speed reference to the drive device 8 so that the blade position after cutting stops at the optimum blade standby position output from the optimum blade standby position calculation means 15.
On the other hand, the blade activation timing calculation unit 9 calculates the blade activation timing using the optimum blade standby position from the optimum blade standby position calculation unit 15 as the blade activation position, and outputs the result to the blade position control unit 14.

このときシャーの起動時間は、前述の（3）式で得られるが、従来の方法では、（3）式の中のＬｓの値が固定値であったのに対して、本制御では、速度Ｖの関数として、Ｌｓを可変数として扱う。図２中、速度Ｖが高速、中速、および低速の場合の、ブレード移動距離は、それぞれ、（８）式からＬsa、Lsb、およびＬscと異なった値となり、速度Ｖが、小さいほど、起動から切断までの時間Ｔ２を小さくすることができる。
つまり、被切断材速度Ｖが、低速の場合、本装置によれば、切断までの時間を、短くすることができるために、切断までの加速時間中に、被圧延材料の速度変動などの影響で発生する切断長誤差が小さくなるから、主に低速時の圧延で、被切断材のサイズ（断面積）が大きい材料の切断精度を高めることができる。 Next, the effect | action with respect to the structure of this invention is demonstrated using FIG.
In FIG. 2, the horizontal axis indicates the elapsed time since the shear is activated, and the vertical axis indicates the shear blade speed, as in FIG. 4, which shows the operation of the conventional apparatus.
In the conventional apparatus, Ls is a constant value regardless of the speed V according to the previous equation (7). On the other hand, in the present invention, as shown in FIG. 2, the shortest acceleration distance required for acceleration at the speed V is obtained according to the material speed V, and the standby position is changed according to the value. That is, instead of the previous equation (7), the moving distance Ls of the shear blade 4, that is, the standby position of the shear blade is determined by the equation (8) using the speed V as a variable.

At this time, the starting time of the shear is obtained by the above-described equation (3). In the conventional method, the value of Ls in the equation (3) is a fixed value. As a function of V, Ls is treated as a variable number. In FIG. 2, when the speed V is high, medium, and low, the blade movement distances are different from Lsa, Lsb, and Lsc from the equation (8), respectively. The time T2 from cutting to cutting can be reduced.
In other words, when the workpiece speed V is low, according to the present apparatus, the time until cutting can be shortened. Therefore, during the acceleration time until cutting, the influence of the speed fluctuation of the material to be rolled, etc. Therefore, the cutting accuracy of a material having a large size (cross-sectional area) of the material to be cut can be increased mainly by rolling at a low speed.

It is a block diagram which shows the cutting control apparatus of the flying shear in Embodiment 1 of this invention. It is explanatory drawing which shows the cutting time and movement distance of the cutting control apparatus of a flying shear in Embodiment 1 of this invention. It is a block diagram which shows the cutting control apparatus of the conventional flying shear. It is explanatory drawing which shows the cutting time and movement distance of the cutting controller of the conventional flying shear.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rolling direction 2 Rolling mill stand 3 Crop shear main body 4 Shear blade 5 Shear rotation direction 6 Shear drive motor 7 Pulse generator (detector)
8 Drive device 9 Blade activation timing calculation means 10 Material detector 11 Pulse generator (detector)
12 Material to be cut (rolled material)
13 Shear blade standby position 14 Blade position control means 15 Optimal blade standby position calculation means 16 Cutting length setting means

Claims (1)

A crop shear main body having shear blades on the outer peripheral surfaces of the respective drums arranged above and below across the rolling line, a shear drive motor connected to the rotating shaft of the drum, and a drive for controlling and driving the shear drive motor And starting the shear drive motor at each cutting timing to cut the material to be cut rolled from the rolling mill stand at a set cutting length, rotating the shear blade in the rotation direction, In a flying shear facility that cuts the material to be cut at a predetermined length ,
Blade activation timing calculation means for generating the activation timing of the shear drive motor by calculating the time required from the shear activation to cutting and the travel distance of the material to be cut;
The position of the shear blade after completion of cutting by outputting a predetermined speed reference to the drive device and inputting the shear blade position detection result to activate the shear blade according to the timing from the blade activation timing calculation means Blade position control means for outputting a speed reference to the drive device so as to stop at a predetermined standby position determined in advance,
Depending on the moving speed of the workpiece, the optimum shear blade standby position that can be accelerated at the shortest distance to the optimum cutting speed at that speed is calculated, and the shear blade standby position is the shortest optimum at that speed. and a optimal blade standby position calculating means for controlling the standby position,
The blade activation timing calculation means calculates the blade activation timing using the optimum blade standby position from the optimum blade standby position calculation means as the blade activation position, and outputs the result to the blade position control means, while the blade In the position control means, a speed reference is output to the drive device so that the blade position after cutting stops at the optimum blade standby position output from the optimum blade standby position calculation means, and the lower the workpiece speed, A flying shear cutting control device characterized in that the time from activation to cutting is reduced .

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