JPH04172117A - Method for measuring forward slip on hot rolling mill - Google Patents
Method for measuring forward slip on hot rolling millInfo
- Publication number
- JPH04172117A JPH04172117A JP2298053A JP29805390A JPH04172117A JP H04172117 A JPH04172117 A JP H04172117A JP 2298053 A JP2298053 A JP 2298053A JP 29805390 A JP29805390 A JP 29805390A JP H04172117 A JPH04172117 A JP H04172117A
- Authority
- JP
- Japan
- Prior art keywords
- roll
- rolling mill
- forward slip
- hot rolling
- rolls
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005098 hot rolling Methods 0.000 title claims abstract description 9
- 238000000034 method Methods 0.000 title claims description 6
- 239000000463 material Substances 0.000 claims abstract description 9
- 239000006185 dispersion Substances 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- 238000005096 rolling process Methods 0.000 description 5
- 238000007796 conventional method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/48—Tension control; Compression control
- B21B37/52—Tension control; Compression control by drive motor control
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/20—Temperature
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Metal Rolling (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、熱間圧延機における先進率の測定方法に関す
る。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for measuring the advance rate in a hot rolling mill.
一般に熱間圧延機における先進率の測定は、前段ワーク
ロール、後段ワークロール、また、前段、後段各々にロ
ードセルか配設される。圧延材の先端か前段の圧延機に
進入すると、ロードセルより噛込信号か発生され、この
噛込信号によってパルス発信器よりの計数か開始される
。圧延材の先端が後段の圧延機に進入するとロードセル
より噛込信号か発生されこのパルス信号の計数か停止さ
れる。Generally, to measure the advance rate in a hot rolling mill, a load cell is installed on the front work roll, the rear work roll, or on each of the front stage and the rear stage. When the tip of the rolled material enters the preceding rolling mill, a load cell generates a bite signal, and this bite signal causes the pulse generator to start counting. When the leading end of the rolled material enters the subsequent rolling mill, a bite signal is generated from the load cell, and the counting of this pulse signal is stopped.
この計数されたパルス数をn、前段ワークロール1回転
中に発生されるパルス数をN、ロール直径をD、とする
と、先進率fは後述の式(1)より求める事が出来る。Assuming that the counted number of pulses is n, the number of pulses generated during one revolution of the front work roll is N, and the diameter of the roll is D, the advance rate f can be determined from equation (1) described below.
例えば特開昭53−24873の如くである。For example, Japanese Patent Application Laid-Open No. 53-24873.
先進率の測定は特開昭53−24873の方法で行う事
か出きるか、その検証は非常に困難である。It is very difficult to verify whether the advance rate can be measured using the method disclosed in Japanese Patent Application Laid-Open No. 53-24873.
そこで容易に噛込信号か得られるロードリレー信号を用
いて測定した。先進率から後述の式(3)を求めて摩擦
係数を求めると、第2図に示す様に、摩擦係数か負にな
ることかある。負の摩擦係数は、物理的に存在するはず
かなく、明らかに先進率の値か実際よりも大きく測定さ
れた事をあられす。Therefore, a load relay signal, which can easily be obtained as a bite signal, was used for measurement. When the coefficient of friction is determined from the advance rate using equation (3) described below, the coefficient of friction may be negative as shown in FIG. A negative coefficient of friction cannot physically exist, and it is clear that the value of the advanced rate was measured to be larger than the actual value.
の項がfか大きいと負になるからである。This is because the term becomes negative if f is large.
本発明は従来技術の課題を有利に解決するものであって
、熱間圧延機における先進率の測定方法において、熱間
圧延機におけるロール1回転当りに発生するパルス数と
、圧延材の先端かロール間を通過する間に発生するパル
ス数とを用い、圧延材の先端かロール間を通過する際に
その通過時間を正確なものとするためにデレイ回路を設
け、ロードリレー立ち上がり遅れを補償する事を特徴と
するものである。The present invention advantageously solves the problems of the prior art, and provides a method for measuring the advance rate in a hot rolling mill, in which the number of pulses generated per roll rotation in the hot rolling mill and the tip of the rolled material are measured. Using the number of pulses generated while passing between the rolls, a delay circuit is provided to ensure accurate passing time when the tip of the rolled material passes between the rolls, and compensates for the delay in the rise of the load relay. It is characterized by things.
以下図面にもとづいて本発明を説明する。The present invention will be explained below based on the drawings.
第1図は本発明の実施例を示す図である。FIG. 1 is a diagram showing an embodiment of the present invention.
1は下部ワークロール、2は上部ワークロール、3は上
部バックアップロール、4は下部バックアップロールて
、仕上圧延機の前段にあるロール群である。鋼板5か前
段のロール群を通り、後段のロール群を通過する。6は
下部ワークロール、7は上部ワークロール、8は上部バ
ックアップロール、9は下部バックアップロールて、゛
仕上圧延機の後段にあるロール群である。IOはパルス
発生器で、ワークロール1の1回転当りNケのパルスを
発生する。11はロードリレーで、前段ロール群に鋼板
か入ってゲートON信号を立ち上げる。1 is a lower work roll, 2 is an upper work roll, 3 is an upper backup roll, and 4 is a lower backup roll, which are roll groups located at the front stage of the finishing rolling mill. The steel plate 5 passes through the roll group at the front stage and then through the roll group at the rear stage. 6 is a lower work roll, 7 is an upper work roll, 8 is an upper backup roll, and 9 is a lower backup roll, which is a group of rolls located at the rear stage of the finishing mill. IO is a pulse generator that generates N pulses per revolution of the work roll 1. 11 is a load relay, which inserts a steel plate into the front roll group and starts the gate ON signal.
12もロードリレーで、前段でロール群に鋼板が入って
ゲートOFF信号を立ち上げる。13.]4はそれぞれ
ゲートON、ゲートOFF信号のデレイ回路であるか、
その時間遅れ補償は、ロードリレー11.12の立ち上
がり時間差によりとちらか片方のみ機能する様にする。12 is also a load relay, and the steel plate enters the roll group at the front stage and starts the gate OFF signal. 13. ] 4 are delay circuits for gate ON and gate OFF signals, respectively,
The time delay compensation is made so that only one of the load relays 11 and 12 functions due to the difference in the rise time of the load relays 11 and 12.
前段の鋼板が前段に入って発生するロードセルがらの信
号を受けてロードリレーかONされるまでの時間を11
、また後段に鋼板か入った時に発生するロードセルの信
号をうけてロードリレーかONされるまでの時間をj
1+1 とし、1=1.−1.+、て求められるロード
リレー立ち上がり時間差tが正ならデレイ回路14てt
秒後にゲートOFF信号を出す様に設定し、負ならデレ
イ回路13てt秒後にゲー)−ON信号を出す様に設定
する。この様にロードリレー立ち上がりの時間差を補償
し、パルスゲート15においてゲートON信号か入って
からゲートOFF信号か入るまでの間のPLGl Oの
発生パルスを、パルスカウンター16でカウントする。The time it takes for the load relay to turn on after receiving the signal from the load cell generated when the front stage steel plate enters the front stage is 11.
, and the time it takes for the load relay to turn on after receiving the load cell signal that occurs when a steel plate enters the rear stage.
1+1, 1=1. -1. +, If the load relay rise time difference t determined by is positive, the delay circuit 14 is t.
It is set so that the gate OFF signal is output after t seconds, and if it is negative, the delay circuit 13 is set so that the gate OFF signal is output after t seconds. In this way, the time difference between the rise of the load relay is compensated for, and the pulse counter 16 counts the pulses generated by PLGlO from the time when the gate ON signal is input to the pulse gate 15 until the time when the gate OFF signal is input.
またこの時カウントされたパルス数をnとすると、先進
率は、
■
へ
で求める事ができる。この(1)式においてLは第1図
に示す様にスタンド間距離、D7は第1図に示した様に
ワークロールlの直径、
である。またデレイ回路13.14を用いない場合、前
段下部ワークロールlのロール周速V、を測定すれば、
(2)式におけるパルス数nは、デレイ回路13,14
がない場合のパルス数である。Further, if the number of pulses counted at this time is n, the advance rate can be obtained from (2). In this equation (1), L is the distance between the stands as shown in FIG. 1, and D7 is the diameter of the work roll l as shown in FIG. 1. In addition, when the delay circuits 13 and 14 are not used, if the roll circumferential speed V of the lower work roll l of the previous stage is measured, the number of pulses n in equation (2) can be calculated from the delay circuits 13 and 14.
This is the number of pulses when there is no .
この様にして求めた先進率を使ってワークロールと鋼板
の間の摩擦係数を求める。摩擦係数の算出には、先進率
との関係から実験的に求めた下記の式を用いる。The coefficient of friction between the work roll and the steel plate is determined using the advance ratio determined in this way. To calculate the friction coefficient, the following formula, which was experimentally determined from the relationship with the advance rate, is used.
ここて f:先進率
hl:スタンド入側板厚
h2:スタンド出側板厚
R′、偏平ロール径
ここで
ここてR6・ロール半径
シ:ポアソン比(0,3)
E:ロールヤング率(21000)
P:圧延荷重(実績値)
W:板幅
(3)式は叶0Wanの圧延理論の数値計算により求め
たもので、(4)式の偏平ロール径を求める式は公知の
ヒツチコック式である。Here f: Advanced ratio hl: Stand entry side plate thickness h2: Stand exit side plate thickness R', flat roll diameter Here, here R6・Roll radius C: Poisson's ratio (0, 3) E: Roll Young's modulus (21000) P : Rolling load (actual value) W: Plate width Equation (3) is obtained by numerical calculation based on rolling theory of 0Wan, and Equation (4) for determining the flat roll diameter is the well-known Hitchcock equation.
〔実施例〕
ロードリレー立ち上がり時間差を考慮せずに先進率を測
定し、(3)、 (41式を用いて、摩擦係数を求めた
結果を第2図に示す。第2図を見てわかる様に従来の方
法では摩擦係数を算出すると負の値となる事かあり、物
理的にあるはずのない値となる。[Example] Figure 2 shows the results of measuring the advance rate without considering the load relay rise time difference and calculating the friction coefficient using formulas (3) and (41). Similarly, when calculating the coefficient of friction using conventional methods, it may become a negative value, a value that cannot physically exist.
本発明により立ち上がり時間を考慮して先進率を測定す
ると、第3図に示す様に負とはならず、しかも測定条件
のちがいによる摩擦係数のばらつきもなく、正確に値を
求める事か出来る。According to the present invention, when the advance rate is measured in consideration of the rise time, it is not negative as shown in FIG. 3, and there is no variation in the coefficient of friction due to differences in measurement conditions, making it possible to accurately determine the value.
ゲー)−ON、ゲートOFF信号はキスロール状態で鋼
板が進入してくる後方スタンドでは理論的に何らかの電
気回路による信号処理を行なわなければ、ロードセルの
信号から直接検出する事は出来ない。本発明は、操業上
に問題ない程度のロードリレー信号を用いて先進率を非
常に正確に測定出来る事により、ワークロール、ストリ
ップ間の摩擦係数を精度よく求められる。また、タンデ
ムミルのセットアツプ時に、マスフロー一定となる様な
、各スタンドロール速度の適用制御にも応用可能である
。Theoretically, the ON and OFF signals cannot be detected directly from the load cell signal at the rear stand where the steel plate enters in a kiss-roll state, unless some kind of signal processing is performed by an electric circuit. According to the present invention, the advance rate can be measured very accurately using a load relay signal that does not cause any operational problems, so that the coefficient of friction between the work roll and the strip can be determined with high accuracy. It can also be applied to control the speed of each stand roll to maintain a constant mass flow when setting up a tandem mill.
第1図は本発明の実施例を示す説明図、第2図は従来法
により求めた摩擦係数、第3図は本発明法により求めた
摩擦係数を示すグラフである。
第1図で10はパルス発生器、11.12はロードリレ
ー、13.14はデレイ回路、15はパルスゲート、1
6はパルスカウンターである。
出 願 人 新日本製鐵株式会社
代理人弁理士 青 柳 稔、1
囚 °°。
く
く
Ill歓よねFIG. 1 is an explanatory diagram showing an embodiment of the present invention, FIG. 2 is a graph showing the friction coefficient determined by the conventional method, and FIG. 3 is a graph showing the friction coefficient determined by the method of the present invention. In Figure 1, 10 is a pulse generator, 11.12 is a load relay, 13.14 is a delay circuit, 15 is a pulse gate, 1
6 is a pulse counter. Applicant Minoru Aoyagi, patent attorney representing Nippon Steel Corporation, 1st prisoner °°. Kuku Ill huan, right?
Claims (1)
ルス数と、圧延材の先端がロール間を通過する間に発生
するパルス数とを用い、圧延材の先端がロール間を通過
する際にその通過時間を正確なものとするためにデレイ
回路を設け、ロードリレー立ち上がり遅れを補償する事
を特徴とする熱間圧延機における先進率の測定方法。1. Using the number of pulses generated per roll rotation in a hot rolling mill and the number of pulses generated while the tip of the rolled material passes between the rolls, when the tip of the rolled material passes between the rolls, A method for measuring an advance rate in a hot rolling mill, which is characterized by providing a delay circuit to make the passing time accurate and compensating for a load relay start-up delay.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2298053A JPH04172117A (en) | 1990-11-02 | 1990-11-02 | Method for measuring forward slip on hot rolling mill |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2298053A JPH04172117A (en) | 1990-11-02 | 1990-11-02 | Method for measuring forward slip on hot rolling mill |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH04172117A true JPH04172117A (en) | 1992-06-19 |
Family
ID=17854524
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2298053A Pending JPH04172117A (en) | 1990-11-02 | 1990-11-02 | Method for measuring forward slip on hot rolling mill |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH04172117A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103223422A (en) * | 2012-01-30 | 2013-07-31 | 宝山钢铁股份有限公司 | Fluctuation control method for strip steel tension between racks of hot continuous rolling mill |
CN104324952A (en) * | 2014-09-05 | 2015-02-04 | 山西太钢不锈钢股份有限公司 | Control method for load relay of hot continuous rolling thin-specification rolling frame |
-
1990
- 1990-11-02 JP JP2298053A patent/JPH04172117A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103223422A (en) * | 2012-01-30 | 2013-07-31 | 宝山钢铁股份有限公司 | Fluctuation control method for strip steel tension between racks of hot continuous rolling mill |
CN104324952A (en) * | 2014-09-05 | 2015-02-04 | 山西太钢不锈钢股份有限公司 | Control method for load relay of hot continuous rolling thin-specification rolling frame |
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