JP2016215237A5 - - Google Patents
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- JP2016215237A5 JP2016215237A5 JP2015102746A JP2015102746A JP2016215237A5 JP 2016215237 A5 JP2016215237 A5 JP 2016215237A5 JP 2015102746 A JP2015102746 A JP 2015102746A JP 2015102746 A JP2015102746 A JP 2015102746A JP 2016215237 A5 JP2016215237 A5 JP 2016215237A5
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- 229910000831 Steel Inorganic materials 0.000 claims description 78
- 239000010959 steel Substances 0.000 claims description 78
- 239000000498 cooling water Substances 0.000 claims description 58
- 238000005096 rolling process Methods 0.000 claims description 36
- 238000005098 hot rolling Methods 0.000 claims description 27
- 239000000463 material Substances 0.000 claims description 21
- 238000001816 cooling Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims 20
- 229910001566 austenite Inorganic materials 0.000 claims 2
- 238000010438 heat treatment Methods 0.000 claims 2
- 239000000203 mixture Substances 0.000 claims 2
- 239000000126 substance Substances 0.000 claims 2
- 230000000694 effects Effects 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Description
冷却水量プリセット部１１は、鋼板５３の圧延に先立ち、標準水量パターン記憶部２３から標準水量のデータを取り出し、板温推定モデル記憶部２４に記憶されている板温推定モデルを用いた演算により、鋼板５３の熱間圧延仕上げミル５１からの出側温度を推定する。そして、その出側温度に基づき、スタンド間冷却装置５４〜５８から注水すべき冷却水量を算出し、算出した冷却水量をプリセット冷却水量として冷却水量指令部３５に出力する。 Prior to rolling the steel plate 53, the cooling water amount presetting unit 11 takes out data of the standard water amount from the standard water amount pattern storage unit 23, and performs an operation using the plate temperature estimation model stored in the plate temperature estimation model storage unit 24. The temperature at the outlet side from the hot rolling finish mill 51 of the steel plate 53 is estimated. Then, based on the outlet side temperature, the amount of cooling water to be poured from the inter-stand cooling devices 54 to 58 is calculated, and the calculated amount of cooling water is output to the cooling water amount command unit 35 as a preset cooling water amount.
以上のような構成を有する熱間圧延仕上げミル出側温度制御装置１００は、具体的なハードウエアとしては、図示しない演算処理装置と記憶装置とを備えたコンピュータやワークステーションによって実現される。そして、プリセット制御部１０の冷却水量プリセット部１１、影響係数算出部１２、材質予測部１３、さらには、ダイナミック制御部３０の目標温度補正量算出部３１、フィードフォワード制御部３２、制御指令温度算出部３３、フィードバック制御部３４、冷却水量指令部３５などの機能ブロックは、前記演算処理装置が、半導体メモリやハードディスク装置などからなる前記記憶装置に格納されている所定のプログラムを実行することによって実現される。また、プリセット制御部１０の目標温度テーブル記憶部２１、速度テーブル記憶部２２、標準水量パターン記憶部２３、板温推定モデル記憶部２４などは、前記記憶装置の一部に割り当てられた領域に所定データが記憶されることによって実現される。 The hot rolling finish mill outlet side temperature control device 100 having the above-described configuration is realized as a specific hardware by a computer or a workstation including an arithmetic processing device and a storage device (not shown). And the cooling water amount preset part 11 of the preset control part 10, the influence coefficient calculation part 12, the material prediction part 13, and also the target temperature correction amount calculation part 31, the feedforward control part 32 of the dynamic control part 30, and the control command temperature calculation The functional blocks such as the unit 33, the feedback control unit 34, and the cooling water amount command unit 35 are realized by the arithmetic processing unit executing a predetermined program stored in the storage device including a semiconductor memory or a hard disk device. Is done. In addition, the target temperature table storage unit 21, the speed table storage unit 22, the standard water amount pattern storage unit 23, the plate temperature estimation model storage unit 24, and the like of the preset control unit 10 are predetermined in an area allocated to a part of the storage device. This is realized by storing data.
この板温推定モデルには、鋼板５３からの熱輻射、対流熱伝導、圧延の塑性変形に伴う加工発熱、鋼板５３が圧延ロール５９に接触したときに奪われる接触伝導熱、鋼板５３と圧延ロール５９の摩擦による摩擦発熱などを計算するためのモデルなどが含まれる。さらには、スタンド間冷却装置５４〜５８からの注水による温度降下などを計算するモデルが含まれる。 The plate temperature estimation model includes heat radiation from the steel plate 53, convection heat conduction, processing heat generated by plastic deformation of rolling, contact conduction heat lost when the steel plate 53 contacts the rolling roll 59, and the steel plate 53 and the rolling roll. A model for calculating frictional heat generated by 59 friction is included. Furthermore, a model for calculating a temperature drop due to water injection from the inter-stand cooling devices 54 to 58 is included.
Claims (10)
前記圧延される鋼板の鋼板温度を推定する板温推定モデルを記憶した板温推定モデル記憶部と、
前記鋼板の圧延に先立って、予め設定された前記鋼板の圧延速度と前記スタンド間冷却装置から注水される冷却水量と前記熱間圧延仕上げミルの入側の鋼板温度と前記板温推定モデルとに基づき前記熱間圧延仕上げミルの出側の鋼板温度を推定し、前記推定結果に基づき前記出側の鋼板温度が予め定められた目標温度と一致するように前記冷却水量をプリセットする冷却水量プリセット部と、
前記鋼板の圧延中に前記圧延スタンドで検出される圧延速度が前記予め設定された圧延速度から変化する圧延速度の変化量を取得し、前記圧延速度の変化量が前記鋼板の材質特性値に及ぼす影響を低減させるための前記鋼板の出側の目標温度の補正量を算出する目標温度補正量算出部と、
前記鋼板の出側の目標温度の補正量に応じた前記冷却水量の変化量を算出し、前記冷却水量プリセット部でプリセットされた前記冷却水量を前記算出した冷却水量の変化量で補正した冷却水量を、前記スタンド間冷却装置に出力する冷却水量指令部と、
を備えること
を特徴とする熱間圧延仕上げミル出側温度制御装置。 A hot rolling finishing mill comprising: a plurality of rolling stands that continuously roll a steel plate; and an inter-stand cooling device that is installed between two adjacent rolling stands of the rolling stand and cools the steel plate. A hot rolling finish mill exit side temperature control device for controlling the steel plate temperature on the exit side of the hot rolling finish mill of the steel sheet rolled in,
A plate temperature estimation model storage unit that stores a plate temperature estimation model for estimating a steel plate temperature of the steel plate to be rolled;
Prior to the rolling of the steel sheet, the preset rolling speed of the steel sheet, the amount of cooling water injected from the inter-stand cooling device, the steel sheet temperature on the inlet side of the hot rolling finish mill, and the sheet temperature estimation model Based on the estimation result, the steel sheet temperature on the outlet side of the hot rolling finish mill is estimated, and the cooling water amount presetting unit presets the cooling water amount so that the steel sheet temperature on the outlet side matches a predetermined target temperature based on the estimation result When,
A rolling speed detected by the rolling stand during rolling of the steel sheet is obtained as a change amount of the rolling speed that changes from the preset rolling speed, and the change amount of the rolling speed affects the material property value of the steel sheet. A target temperature correction amount calculation unit for calculating a correction amount of the target temperature on the outlet side of the steel sheet for reducing the influence;
The amount of cooling water calculated according to the amount of correction of the target temperature on the outlet side of the steel sheet, and the amount of cooling water preset by the cooling water amount preset unit is corrected with the amount of change of the calculated amount of cooling water A cooling water amount command unit that outputs to the inter-stand cooling device,
A hot rolling finishing mill outlet side temperature control device characterized by comprising:
前記材質予測部が前記鋼板の圧延速度を変化させて算出した前記材質特性値の差に基づき、前記圧延速度の変化量が前記材質特性値に及ぼす影響を第１の影響係数として算出し、前記材質予測部が前記出側の鋼板温度を変化させて算出した前記材質特性値の差に基づき、前記出側の鋼板温度の変化量が前記材質特性値に及ぼす影響を第２の影響係数として算出する影響係数算出部と、
をさらに備え、
前記目標温度補正量算出部は、
前記圧延速度の変化量と、前記第１の影響係数および前記第２の影響係数の少なくとも一方の影響係数と、に基づき、前記鋼板の出側の目標温度の補正量を算出すること
を特徴とする請求項１に記載の熱間圧延仕上げミル出側温度制御装置。 The hot rolling finish mill based on the steel plate chemical composition obtained from the host computer, information including the heating history and rolling history, and the outgoing steel plate temperature and rolling speed estimated by the cooling water amount preset section. As a material characteristic value of the steel sheet on the exit side of the material, a material prediction unit for calculating at least one of austenite grain size and dislocation density,
Based on the difference of the material property value calculated by changing the rolling speed of the steel sheet by the material predicting unit, the influence of the change amount of the rolling speed on the material property value is calculated as a first influence coefficient, Based on the difference between the material property values calculated by the material predicting unit changing the steel plate temperature on the delivery side, the influence of the amount of change in the steel plate temperature on the delivery side on the material property value is calculated as a second influence coefficient. An influence coefficient calculation unit to
Further comprising
The target temperature correction amount calculation unit
A correction amount for the target temperature on the delivery side of the steel sheet is calculated based on the amount of change in the rolling speed and the influence coefficient of at least one of the first influence coefficient and the second influence coefficient. The hot rolling finishing mill outlet side temperature control device according to claim 1.
前記冷却水量指令部が算出する前記鋼板の出側の目標温度の補正量に応じた前記冷却水量の変化量として、前記フィードフォワード制御部で算出された前記冷却水量の変化量を用いること
を特徴とする請求項１に記載の熱間圧延仕上げミル出側温度制御装置。 A feedforward control unit that calculates a change amount of the cooling water amount so as to decrease a correction amount of the target temperature on the outlet side of the steel sheet calculated by the target temperature correction amount calculation unit;
The amount of change of the cooling water amount calculated by the feedforward control unit is used as the amount of change of the cooling water amount according to the correction amount of the target temperature on the outlet side of the steel sheet calculated by the cooling water amount command unit. The hot rolling finish mill outlet side temperature control device according to claim 1.
前記制御指令温度算出部で算出された前記鋼板の出側の目標温度と前記熱間圧延仕上げミルの出側で測定された前記鋼板の温度との差を減少させるような前記冷却水量の変化量を算出するフィードバック制御部と、
をさらに備え、
前記冷却水量指令部が算出する前記鋼板の出側の目標温度の補正量に応じた前記冷却水量の変化量として、前記フィードバック制御部で算出された前記冷却水量の変化量を用いること
を特徴とする請求項１に記載の熱間圧延仕上げミル出側温度制御装置。 Based on the correction amount of the target temperature on the outlet side of the steel sheet calculated by the target temperature correction amount calculation unit and the target temperature on the outlet side of the steel sheet used in the cooling water amount preset unit, the actual temperature control is used. A control command temperature calculation unit for calculating a target temperature of the delivery side of the steel sheet;
The amount of change in the amount of cooling water that reduces the difference between the target temperature on the delivery side of the steel sheet calculated by the control command temperature calculation unit and the temperature of the steel sheet measured on the delivery side of the hot rolling finish mill. A feedback control unit for calculating
Further comprising
The amount of change of the cooling water amount calculated by the feedback control unit is used as the amount of change of the cooling water amount according to the correction amount of the target temperature on the outlet side of the steel sheet calculated by the cooling water amount command unit. The hot rolling finishing mill outlet side temperature control device according to claim 1.
前記目標温度補正量算出部で算出された前記鋼板の出側の目標温度の補正量と前記冷却水量プリセット部で用いられた前記鋼板の出側の目標温度とに基づき、実際の制御に用いる前記鋼板の出側の目標温度を算出する制御指令温度算出部と、
前記制御指令温度算出部で算出された前記鋼板の出側の目標温度と前記熱間圧延仕上げミルの出側で測定された前記鋼板の温度との差を減少させるような前記冷却水量の第２の変化量を算出するフィードバック制御部と、
をさらに備え、
前記冷却水量指令部が算出する前記鋼板の出側の目標温度の補正量に応じた前記冷却水量の変化量として、前記冷却水量の第１の変化量と前記冷却水量の第２の変化量とにそれぞれに重みを付して加算した量を用いること
を特徴とする請求項１に記載の熱間圧延仕上げミル出側温度制御装置。 A feedforward control unit that calculates a first change amount of the cooling water amount so as to decrease the correction amount of the target temperature on the outlet side of the steel sheet calculated by the target temperature correction amount calculation unit;
Based on the correction amount of the target temperature on the outlet side of the steel sheet calculated by the target temperature correction amount calculation unit and the target temperature on the outlet side of the steel sheet used in the cooling water amount preset unit, the actual temperature control is used. A control command temperature calculation unit for calculating a target temperature of the delivery side of the steel sheet;
A second amount of the cooling water that reduces the difference between the target temperature on the delivery side of the steel sheet calculated by the control command temperature calculation unit and the temperature of the steel sheet measured on the delivery side of the hot rolling finish mill. A feedback control unit for calculating a change amount of
Further comprising
As a change amount of the cooling water amount according to the correction amount of the target temperature on the outlet side of the steel sheet calculated by the cooling water amount command unit, a first change amount of the cooling water amount and a second change amount of the cooling water amount The hot roll finishing mill outlet side temperature control device according to claim 1, wherein an amount obtained by adding a weight to each is used.
前記制御装置は、
圧延される前記鋼板の板温を推定する板温推定モデルを記憶した板温推定モデル記憶部を有し、
前記鋼板の圧延に先立って、予め設定された前記鋼板の圧延速度と前記スタンド間冷却装置から注水される冷却水量と前記熱間圧延仕上げミルの入側の鋼板温度と前記板温推定モデルとに基づき前記熱間圧延仕上げミルの出側の鋼板温度を推定し、前記推定結果に基づき前記出側の鋼板温度が予め定められた目標温度と一致するように前記冷却水量をプリセットする冷却水量プリセット処理と、
前記鋼板の圧延中に前記圧延スタンドで検出される圧延速度が前記予め設定された圧延速度から変化する圧延速度の変化量を取得し、前記圧延速度の変化量が前記鋼板の材質特性値に及ぼす影響を低減させるための前記鋼板の出側の目標温度の補正量を算出する目標温度補正量算出処理と、
前記鋼板の出側の目標温度の補正量に応じた前記冷却水量の変化量を算出し、前記冷却水量プリセット処理でプリセットされた前記冷却水量を前記算出した冷却水量の変化量で補正した冷却水量を、前記スタンド間冷却装置に出力する冷却水量指令処理と、
を実行すること
を特徴とする熱間圧延仕上げミル出側温度の制御方法。 A hot rolling finishing mill comprising: a plurality of rolling stands that continuously roll a steel plate; and an inter-stand cooling device that is installed between two adjacent rolling stands of the rolling stand and cools the steel plate. A control method of the hot rolling finish mill outlet side temperature by the control device for controlling the steel plate temperature on the outlet side of the hot rolling finish mill of the steel sheet rolled in,
The controller is
A sheet temperature estimation model storage unit storing a sheet temperature estimation model for estimating the sheet temperature of the steel sheet to be rolled;
Prior to the rolling of the steel sheet, the preset rolling speed of the steel sheet, the amount of cooling water injected from the inter-stand cooling device, the steel sheet temperature on the inlet side of the hot rolling finish mill, and the sheet temperature estimation model Based on the estimation result, the steel sheet temperature on the delivery side of the hot rolling finish mill is estimated, and the cooling water amount preset process for presetting the cooling water amount so that the steel sheet temperature on the delivery side matches a predetermined target temperature based on the estimation result When,
A rolling speed detected by the rolling stand during rolling of the steel sheet is obtained as a change amount of the rolling speed that changes from the preset rolling speed, and the change amount of the rolling speed affects the material property value of the steel sheet. A target temperature correction amount calculation process for calculating a correction amount of the target temperature on the outlet side of the steel sheet for reducing the influence;
The amount of cooling water calculated by calculating the amount of change of the cooling water according to the correction amount of the target temperature on the outlet side of the steel sheet, and the amount of cooling water corrected by the amount of change of the calculated amount of cooling water corrected by the amount of cooling water preset Cooling water amount command processing to output to the inter-stand cooling device,
A method for controlling the temperature at the outlet side of a hot rolling finish mill, characterized in that
上位コンピュータから取得された前記鋼板の化学組成、加熱履歴および圧延履歴を含む情報、ならびに、前記冷却水量プリセット処理で推定された前記出側の鋼板温度および圧延速度に基づき、前記熱間圧延仕上げミルの出側における前記鋼板の材質特性値として、オーステナイト粒径と転位密度の少なくとも一方を算出する材質予測処理と、
前記材質予測処理において前記鋼板の圧延速度を変化させて算出した前記材質特性値の差に基づき、前記圧延速度の変化量が前記材質特性値に及ぼす影響を第１の影響係数として算出し、前記材質予測処理において前記出側の鋼板温度を変化させて算出した前記材質特性値の差に基づき、前記出側の鋼板温度の変化量が前記材質特性値に及ぼす影響を第２の影響係数として算出する影響係数算出処理と、
をさらに実行し、
前記目標温度補正量算出処理では、前記圧延速度の変化量と、前記第１の影響係数および前記第２の影響係数の少なくとも一方の影響係数と、に基づき、前記鋼板の出側の目標温度の補正量を算出すること
を特徴とする請求項６に記載の熱間圧延仕上げミル出側温度の制御方法。 The controller is
Based on the information including the chemical composition, heating history and rolling history of the steel sheet obtained from the host computer, and the outgoing steel sheet temperature and rolling speed estimated by the cooling water amount preset process, the hot rolling finish mill As a material characteristic value of the steel sheet on the exit side of the material, a material prediction process for calculating at least one of austenite grain size and dislocation density,
Based on the difference in the material property value calculated by changing the rolling speed of the steel sheet in the material prediction process, the effect of the amount of change in the rolling speed on the material property value is calculated as a first influence coefficient, Based on the difference in the material characteristic value calculated by changing the steel sheet temperature on the delivery side in the material prediction process, the influence of the change amount of the steel sheet temperature on the delivery side on the material property value is calculated as a second influence coefficient. Influence coefficient calculation processing to
Run further,
In the target temperature correction amount calculation process, based on the amount of change in the rolling speed and the influence coefficient of at least one of the first influence coefficient and the second influence coefficient, the target temperature of the outlet side of the steel sheet is calculated. and the child calculate the amount of correction
The method for controlling the hot rolling finish mill outlet side temperature according to claim 6.
前記目標温度補正量算出処理で算出された前記鋼板の出側の目標温度の補正量を減少させるような前記冷却水量の変化量を算出するフィードフォワード制御処理
をさらに実行し、
前記冷却水量指令処理で算出される前記鋼板の出側の目標温度の補正量に応じた前記冷却水量の変化量として、前記フィードフォワード制御処理で算出した前記冷却水量の変化量を用いること
を特徴とする請求項６に記載の熱間圧延仕上げミル出側温度の制御方法。 The controller is
A feedforward control process for calculating a change amount of the cooling water amount so as to reduce a correction amount of the target temperature on the outlet side of the steel sheet calculated in the target temperature correction amount calculation process;
The amount of change in the cooling water amount calculated in the feedforward control process is used as the amount of change in the cooling water amount according to the correction amount of the target temperature on the outlet side of the steel sheet calculated in the cooling water amount command processing. The method for controlling the hot rolling finish mill outlet side temperature according to claim 6.
前記目標温度補正量算出処理で算出された前記鋼板の出側の目標温度の補正量と前記冷却水量プリセット処理で用いられた前記鋼板の出側の目標温度とに基づき、実際の制御に用いる前記鋼板の出側の目標温度を算出する制御指令温度算出処理と、
前記制御指令温度算出処理で算出された前記鋼板の出側の目標温度と前記熱間圧延仕上げミルの出側で測定された前記鋼板の温度との差を減少させるような前記冷却水量の変化量を算出するフィードバック制御処理と、
をさらに実行し、
前記冷却水量指令処理で算出される前記鋼板の出側の目標温度の補正量に応じた前記冷却水量の変化量として、前記フィードバック制御処理で算出した前記冷却水量の変化量を用いること
を特徴とする請求項６に記載の熱間圧延仕上げミル出側温度の制御方法。 The controller is
Based on the correction amount of the target temperature on the outlet side of the steel sheet calculated in the target temperature correction amount calculation process and the target temperature on the outlet side of the steel sheet used in the cooling water amount preset process, the actual temperature control is used. Control command temperature calculation processing for calculating the target temperature of the delivery side of the steel sheet;
The amount of change in the amount of cooling water that reduces the difference between the target temperature on the delivery side of the steel sheet calculated in the control command temperature calculation process and the temperature of the steel sheet measured on the delivery side of the hot rolling finish mill Feedback control processing for calculating
Run further,
The amount of change in the amount of cooling water calculated in the feedback control process is used as the amount of change in the amount of cooling water according to the correction amount of the target temperature on the outlet side of the steel sheet calculated in the amount of cooling water command process. The method for controlling the hot rolling finish mill outlet side temperature according to claim 6.
前記目標温度補正量算出処理で算出された前記鋼板の出側の目標温度の補正量を減少させるような前記冷却水量の第１の変化量を算出するフィードフォワード制御処理と、
前記目標温度補正量算出処理で算出された前記鋼板の出側の目標温度の補正量と前記冷却水量プリセット処理で用いられた前記鋼板の出側の目標温度とに基づき、実際の制御に用いる前記鋼板の出側の目標温度を算出する制御指令温度算出処理と、
前記制御指令温度算出処理で算出された前記鋼板の出側の目標温度と前記熱間圧延仕上げミルの出側で測定された前記鋼板の温度との差を減少させるような前記冷却水量の第２の変化量を算出するフィードバック制御処理と、
をさらに実行し、
前記冷却水量指令処理で算出される前記鋼板の出側の目標温度の補正量に応じた前記冷却水量の変化量として、前記冷却水量の第１の変化量と前記冷却水量の第２の変化量とにそれぞれに重みを付して加算した量を用いること
を特徴とする請求項６に記載の熱間圧延仕上げミル出側温度の制御方法。 The controller is
A feedforward control process for calculating a first change amount of the cooling water amount so as to decrease the correction amount of the target temperature on the outlet side of the steel sheet calculated in the target temperature correction amount calculation process;
Based on the correction amount of the target temperature on the outlet side of the steel sheet calculated in the target temperature correction amount calculation process and the target temperature on the outlet side of the steel sheet used in the cooling water amount preset process, the actual temperature control is used. Control command temperature calculation processing for calculating the target temperature of the delivery side of the steel sheet;
A second amount of the cooling water that reduces the difference between the target temperature on the delivery side of the steel plate calculated in the control command temperature calculation process and the temperature of the steel plate measured on the delivery side of the hot rolling finish mill . Feedback control processing for calculating the amount of change in
Run further,
As the amount of change of the cooling water amount according to the correction amount of the target temperature on the outlet side of the steel sheet calculated in the cooling water amount command processing, the first amount of change of the cooling water amount and the second amount of change of the cooling water amount 7. The method for controlling the hot rolling finish mill outlet side temperature according to claim 6, characterized in that:
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| JP7058182B2 (en) * | 2018-06-08 | 2022-04-21 | 株式会社日立製作所 | Target temperature history creation device, target temperature history creation method and program |
| CN109108094B (en) * | 2018-08-27 | 2019-07-09 | 合肥东方节能科技股份有限公司 | A kind of screw-thread steel fine grain rolling intelligent control method |
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| CN111420999B (en) * | 2019-01-10 | 2021-06-15 | 宝山钢铁股份有限公司 | Method for controlling temperature difference between upper surface and lower surface of finish rolling intermediate billet |
| CN111420998B (en) * | 2019-01-10 | 2021-06-15 | 宝山钢铁股份有限公司 | Method for uniformly heating width of precision rolling intermediate billet in length direction at temperature |
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| CN111936245B (en) * | 2019-03-06 | 2022-08-05 | 东芝三菱电机产业系统株式会社 | Cooling water injection control device and cooling water injection control method for rolling mill |
| CN112437702B (en) * | 2019-06-26 | 2023-02-10 | 东芝三菱电机产业系统株式会社 | Temperature control device of hot rolling production line |
| EP3865226A1 (en) | 2020-02-11 | 2021-08-18 | Primetals Technologies Germany GmbH | Determining a sensitivity of a target size of a rolling stock from an operating variable of a hot rolling mill |
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| CN112605134A (en) * | 2020-12-28 | 2021-04-06 | 太原科技大学 | Average plate temperature pre-judging method in roller way conveying process of magnesium alloy preheating plate |
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