熱軋溫控系統參數調適之研究

Research of Parameter Tuning of Temperature Control System during Hot Rolling Process

曾文政(Wen-Cheng Tzeng)

指導教授 ： 吳昌暉

元智大學/工程學院/機械工程學系/碩士(2001年)

摘要

在鋼板熱軋過程中，換軋輥及換鋼種是必然發生且發生頻率高的情形。 原廠發現換軋輥時發生板厚偏薄及第七站頭端軋延力設定值偏高的情形。承上，本文依據原廠所提供的大量線上軋延資料，定義四種特殊狀況：狀況1.含換第七站軋輥且不換鋼種，狀況2.只換一至六站軋輥任數站軋輥且不換鋼種，狀況3.只換鋼種不換任何一站軋輥，狀況4.換鋼種且換第七站軋輥。並且利用統計歸納與物理意義分析，建立針對各特殊狀況頭端完軋溫度設定值及各站頭端軋延力設定值的參數調適法則，期能使頭端完軋板厚誤差小於1/2公差。
狀況1.及狀況2在頭端完軋溫度設定值參數調適方面，是利用換輥卷頭端完軋溫度誤定誤差，及換輥卷與前一卷頭端完軋溫度設定誤差變化量的趨勢，來決定換輥卷頭端完軋溫度設定值修正量。在各換輥站頭端軋延力設定值參數調適方面，是利用各換輥站頭端軋延力設定誤差的趨勢，來決定各換輥站軋延力乘子的修正參數。
狀況3.及狀況4.均不對所有資料做整體性頭端完軋溫度設定值及第七站頭端軋延力設定值的調適。狀況3.則是針對鋼種G_1換J_1及N_1換N_3的情形，提出換鋼種鋼卷的頭端完軋溫度設定值及第七站頭端延力設定值的調適法則。
本文針對各特殊狀況所提出的參數調適法則，均較調適前大幅降低頭端完溫度設定誤差量及各站頭端軋延力設定誤差量。調適結果亦優於原廠數值。

關鍵字

換軋輥 ； 換鋼種 ； 頭端完軋溫度 ； 頭端軋延力

並列摘要

Roll change and Steel change always happen during hot rolling process in high frequency. China Steel Coop. found that head end finished gage measurements tend to be much thinner then setup gage, and head end force setup of stand 7 tends to be much higher then it’s measurements after roll changes. Therefore, according to large amount of on-line hot rolling data provided by the company., this thesis defines following four special events for discusstion: Case1. Roll change occurs in stand 7 with zero or more roll changes occur in the other stands and without any steel change. Case 2. Zero or more roll changes occur in all stands except stand 7, and without any steel change. Case 3. Steel change occurs without any roll change. Case 4. Steel change occurs with roll change occurs in stand 7. This thesis use statistics, induction, and physical analysis to establish parameter tuning lows for head end finished temperature setup and head end force setup of each roll change stand for each special event, and expects to make finished gage error less than 1/2 tolerance.
For the parameter tuning of head end finished temperature in case1. and case2., this thesis use the information of head end finished temperature setup error of roll change coil and the information of head end finished temperature setup error change between roll change coil and the coil before roll change coil to decide the correction of head end finished temperature setup of roll change coil. For the parameter tuning of head end force setup of each roll change stand in case1. and case2., this thesis use the trend of head end force setup error of each roll change stand to decide the correctional coefficient of stand force mutliplyer.
In case3. and case4., there is not any entire tuning low for head end finished temperature setup and head end force setup of stand 7 for each case. In case 3, this thesis focus on steel change from G_1 to J_1 and from N_1 to N_3, and there is a tuning low established for head end finished temperature setup and head end force setup of stand 7 for each steel change.
In sum, magnitude of head end finished temperature setup error and head end force setup error of each roll change stand due to the parameter tunning low for each special event established in thesis is much less then the magnitude of setup error before parameter tuning. The result after parameter tuning are also better then the result due to parameter tuning low of the company.

並列關鍵字

roll change ； steel change ； head end finished temperature ； head end force

參考文獻

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