JPH03111514A - Method for controlling atmosphere in continuous non-oxidizing annealing furnace - Google Patents
Method for controlling atmosphere in continuous non-oxidizing annealing furnaceInfo
- Publication number
- JPH03111514A JPH03111514A JP20633189A JP20633189A JPH03111514A JP H03111514 A JPH03111514 A JP H03111514A JP 20633189 A JP20633189 A JP 20633189A JP 20633189 A JP20633189 A JP 20633189A JP H03111514 A JPH03111514 A JP H03111514A
- Authority
- JP
- Japan
- Prior art keywords
- gas
- atmosphere
- annealing furnace
- signal
- continuous non
- 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
- 238000000137 annealing Methods 0.000 title claims abstract description 17
- 230000001590 oxidative effect Effects 0.000 title claims abstract description 10
- 238000000034 method Methods 0.000 title claims description 9
- 239000000463 material Substances 0.000 claims abstract description 25
- 238000000605 extraction Methods 0.000 claims description 9
- 238000004458 analytical method Methods 0.000 claims description 4
- 238000004868 gas analysis Methods 0.000 claims description 3
- 230000002950 deficient Effects 0.000 abstract description 6
- 238000007599 discharging Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 29
- 238000005070 sampling Methods 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Landscapes
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、連続無酸化焼鈍炉の炉内雰囲気制御方法に関
する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for controlling the atmosphere in a continuous non-oxidizing annealing furnace.
連続無酸化焼鈍炉の炉内雰囲気制御を適切に行うことは
、材料の品質管理上きわめて重要である。Appropriate control of the atmosphere inside a continuous non-oxidizing annealing furnace is extremely important for material quality control.
この炉内雰囲気制御に際しては、焼鈍炉内を複数のゾー
ンに分割し、各ゾーン毎に対応するガス分析計によりガ
ス成分分析を行い、その結果に基づいて、雰囲気調整ガ
ス成分の調節を行うことが考えられるが、この種のガス
分析計は、きわめて高価であるために、−船釣には、−
台のガス分析計を共用し、各ゾーンを切替えながら分析
を行っている。When controlling the atmosphere inside the furnace, the inside of the annealing furnace is divided into multiple zones, gas components are analyzed using a gas analyzer corresponding to each zone, and the atmosphere adjustment gas components are adjusted based on the results. However, this type of gas analyzer is extremely expensive, so it is not suitable for boat fishing.
A gas analyzer is shared, and analysis is performed while switching between each zone.
しかし、順次各ゾーン毎切替えながら雰囲気制御をおこ
なっていることに伴う応答遅れ、ならびに炉のサンプリ
ング個所からガス分析計への配管経路およびガス分析計
内部での応答遅れが必然的に生じるために、材料の装入
・抽出の際において炉内雰囲気に対する外乱が生じる。However, due to the fact that the atmosphere is controlled by sequentially switching each zone, a response delay inevitably occurs, as well as a response delay in the piping route from the sampling point of the furnace to the gas analyzer and inside the gas analyzer. Disturbances occur to the atmosphere inside the furnace when charging and extracting materials.
この外乱に対して適切に対処できないと、材料表面の炭
素量（Ｃ量）が変化し、当該材料表面に脱炭および浸炭
が生じ、目的とする材料が得られない。その結果、不良
品の発生頻度が高くなる。If this disturbance cannot be appropriately dealt with, the amount of carbon (C amount) on the surface of the material changes, decarburization and carburization occur on the surface of the material, and the desired material cannot be obtained. As a result, the frequency of occurrence of defective products increases.
そこで、本発明の主たる目的は、材料の装入・抽出時に
おける外乱に対して、適切に雰囲気制御を行うことがで
き、不良品発生頻度が低減する連続無酸化焼鈍炉の炉内
雰囲気制御方法を提供することにある。Therefore, the main object of the present invention is to provide a method for controlling the atmosphere in a continuous non-oxidizing annealing furnace, which can appropriately control the atmosphere against disturbances during material charging and extraction, and reduce the frequency of defective products. Our goal is to provide the following.
上記課題は、連続無酸化焼鈍炉の各ゾーンからの炉内雰
囲気ガスを経時的に切替えながら一つのガス分析計に取
り込んでガス分析を行うとと−もに、各ガス分析段階の
分析ガス成分濃度に基づいて、雰囲気調整ガス中のガス
成分濃度を調節する炉内雰囲気制御方法において、
前記焼鈍炉への材料の装入・抽出に伴う外乱を予測し、
その外乱が少なくなるように、雰囲気調整ガス成分の補
正を、材料の装入・抽出の都度行うことで解決できる。The above-mentioned problem is to analyze the furnace atmosphere gas from each zone of a continuous non-oxidizing annealing furnace by switching it over time into a single gas analyzer, and to analyze the analyzed gas components at each gas analysis stage. In the furnace atmosphere control method for adjusting the concentration of gas components in the atmosphere adjustment gas based on the concentration, predicting disturbances associated with charging and extracting materials to the annealing furnace,
In order to reduce this disturbance, the problem can be solved by correcting the atmosphere adjustment gas components each time the material is charged or extracted.
本発明では、材料の装入・抽出に伴う外乱を予測し、そ
の外乱が少なくなるように、雰囲気調整ガス成分の補正
を材料の装入・抽出の都度行うので、後述の実施例のよ
うに、外乱に対して強い制御系を構成でき、もって不良
品発生頻度が低減する。In the present invention, disturbances accompanying material charging/extraction are predicted, and the atmosphere adjustment gas components are corrected each time material is charged/extracted so that the disturbance is reduced. , it is possible to configure a control system that is resistant to disturbances, thereby reducing the frequency of defective products.
以下本発明をさらに詳説する。 The present invention will be explained in more detail below.
第１図は本発明の制御系を示したもので、■は連続無酸
化焼鈍炉で、材料Ｍは搬送ロール２群上を右方に順次搬
送される。焼鈍炉１の入口にはリミットスイッチ３Ａ、
３Ｂが配設されている。FIG. 1 shows the control system of the present invention, where (2) is a continuous non-oxidizing annealing furnace, and material M is sequentially conveyed to the right over two groups of conveyor rolls. A limit switch 3A is installed at the entrance of the annealing furnace 1.
3B is installed.
また、焼鈍炉ｌ内は、無酸化雰囲気ガスが流量調節弁４
を有する供給路５により供給される。この雰囲気ガス供
給路５は後述するように、各ゾーンごとに１対１で設け
られている（図面では１つのみ）。無酸化雰囲気ガスと
しては、たとえばＣＯ：５〜１５％、Ｃ０２：０．５〜
１．０％、Ｎ２：５〜１５％、Ｎ２ニア０〜９０％、酸
素や他の成分ガスは無存在とされるものが用いられる。In addition, inside the annealing furnace 1, non-oxidizing atmospheric gas flows through the flow rate control valve 4.
It is supplied by a supply path 5 having a. As will be described later, the atmospheric gas supply channels 5 are provided one to one for each zone (only one in the drawing). Non-oxidizing atmospheric gases include, for example, CO: 5-15%, CO2: 0.5-
1.0%, N2: 5 to 15%, N2 near 0 to 90%, and no oxygen or other component gases are used.
一方、焼鈍炉１は搬送方向に沿って制御的に複数のゾー
ンに分割され、各ゾーンに対してサンプリング管６．６
・・・が配設されている。これらサンプリング管６．６
・・・は、切替え手段７を介して一台のガス分析計８に
接続されている。切替え手段７では、分析対象ゾーン毎
、サンプリングの切替えを行うようにしである。ガス分
析計８からの分析結果は、実績値として炉内雰囲気調節
計９に与えられ、設定値との比較結果を経たその調節信
号は、流量調節計１０を介して流量調節信号として流量
調節弁４に出力される構成とされている。On the other hand, the annealing furnace 1 is controllably divided into a plurality of zones along the conveying direction, and each zone has a sampling tube 6.
...is arranged. These sampling tubes6.6
... are connected to one gas analyzer 8 via a switching means 7. The switching means 7 is designed to switch sampling for each zone to be analyzed. The analysis result from the gas analyzer 8 is given to the furnace atmosphere controller 9 as an actual value, and the adjustment signal after comparison with the set value is sent to the flow rate adjustment valve as a flow rate adjustment signal via the flow rate controller 10. 4.
上記の制御は従来から行われてきたものであるが、本発
明では、材料の装入・抽出に伴う外乱を予測し、その外
乱が少なくなるように、雰囲気調整ガス成分の補正を、
具体例では供給ガスの流量の補正制御を、材料Ｍの装入
・抽出の都度行うようにしである。すなわち、材料Ｍの
装入・抽出をリミットスイッチ３Ａ、３Ｂなどにより検
出する（ただし抽出時の検出用リミットスイッチについ
ては図示せず）。また、ガス分析計８からの分析結果は
補正テーブルＩＩＡを有する演算器１１に取り込むよう
にしである。補正テーブルＩＩＡとしては、たとえばＣ
Ｏ２濃度とガス流量との相関を基礎としたものが用いら
れる。The above control has been conventionally performed, but in the present invention, disturbances accompanying material charging and extraction are predicted, and the atmosphere adjustment gas components are corrected to reduce the disturbances.
In a specific example, the flow rate of the supply gas is corrected and controlled each time the material M is charged or extracted. That is, the charging and extraction of the material M is detected by limit switches 3A, 3B, etc. (however, the limit switches for detection at the time of extraction are not shown). Further, the analysis results from the gas analyzer 8 are taken into a computing unit 11 having a correction table IIA. For example, as the correction table IIA, C
A method based on the correlation between O2 concentration and gas flow rate is used.
いまリミットスイッチ３Ａ、３Ｂがオンし、材料Ｍの装
入が検知されると、補正スタート信号が演算器１１に与
えられ、演算器１１では、現Ｃ○２濃度信号をガス分析
計８から得て、補正テーブル１１Ａにより補正ガス流量
としてゲート１２に出力する。この場合、直ちに補正信
号を流量調節計１０に出力するのではなく、タイマー１
３により適宜の時間遅延させて出力するようにする。流
量調節計ｌＯに与えられた補正信号に応じて、流量調節
計１０から流量調節弁４に調節信号が出力される。補正
は、装入・抽出時点から適宜の時間を経たならば、終了
して通常の制御に移行できる。When the limit switches 3A and 3B are now turned on and the charging of material M is detected, a correction start signal is given to the calculator 11, and the calculator 11 obtains the current C○2 concentration signal from the gas analyzer 8. Then, the correction table 11A outputs the corrected gas flow rate to the gate 12. In this case, instead of immediately outputting the correction signal to the flow rate controller 10, the timer 1
3, the output is delayed by an appropriate time. A control signal is output from the flow rate regulator 10 to the flow rate regulating valve 4 in accordance with the correction signal given to the flow rate regulator IO. The correction is completed after an appropriate amount of time has elapsed from the time of charging/extraction, and normal control can be started.
他方、抽出の時点でも同様な補正制御がなされる。On the other hand, similar correction control is performed at the time of extraction as well.
演算器１１における補正ガス流量の算出に当たっては、
当該材料Ｍが目標のＣ量となるように、たとえばカーボ
ンポテンシャル値（ＰＦ値）＝（Ｃ０％）”／ＣＯ２％
を設定し、ＣＯ２％の値を基礎として補正ガス量を調節
するほか、適宜の態様を採用できる。In calculating the correction gas flow rate in the calculator 11,
For example, carbon potential value (PF value) = (C0%)''/CO2% so that the material M has the target C content.
In addition to setting the value of CO2% and adjusting the correction gas amount based on the value of CO2%, an appropriate mode can be adopted.
次に実施例を示し本発明の効果を明らかにする。 Next, Examples will be shown to clarify the effects of the present invention.
第１図の制御系により、炉内雰囲気制御を行い材料表面
のＣ量制御を行った。Using the control system shown in FIG. 1, the atmosphere in the furnace was controlled and the amount of C on the material surface was controlled.
第２図のＡ欄は、従来例であり、Ｂ欄は本発明法による
結果である。この結果から、材料表面のＣ量を目標範囲
に確実に制御できることが判る。Column A in FIG. 2 shows the conventional example, and column B shows the results obtained by the method of the present invention. This result shows that the amount of C on the material surface can be reliably controlled within the target range.
また、不良品の発生頻度として、従来が５％であったも
のが、本発明によると、３％に低減した。Furthermore, the frequency of defective products has been reduced from 5% in the past to 3% according to the present invention.
以上の通り、本発明によれば、材料の装入・抽出時にお
ける外乱に対して、適切に雰囲気制御を行うことができ
、不良品発生頻度が低減する。As described above, according to the present invention, it is possible to appropriately control the atmosphere against disturbances during charging and extraction of materials, and the frequency of occurrence of defective products is reduced.
第１図は本発明の制御系のフローシート、第２図は従来
法と本発明法との炉内雰囲気制御例の結果を示すグラフ
である。
■・・・焼鈍炉、３Ａ、３Ｂ・・・リミットスイッチ、
４・・・流量調節弁、６・・・サンプリング管、８・・
・ガス分析計、
９・・・炉内雰囲気調節計、
・・流量調節計、
■
■・・・演算器、
１人・・・補正テーブル。FIG. 1 is a flow sheet of the control system of the present invention, and FIG. 2 is a graph showing the results of furnace atmosphere control examples using the conventional method and the method of the present invention. ■...Annealing furnace, 3A, 3B...Limit switch,
4...Flow rate control valve, 6...Sampling pipe, 8...
・Gas analyzer, 9...Furnace atmosphere controller, ・Flow rate controller, ■ ■...Calculator, 1 person...Correction table.
Claims (1)
スを経時的に切替えながら一つのガス分析計に取り込ん
でガス分析を行うとともに、各ガス分析段階の分析ガス
成分濃度に基づいて、雰囲気調整ガス中のガス成分濃度
を調節する炉内雰囲気制御方法において、 前記焼鈍炉への材料の装入・抽出に伴う外乱を予測し、
その外乱が少なくなるように、雰囲気調整ガス成分の補
正を、材料の装入・抽出の都度行うことを特徴とする連
続無酸化焼鈍炉の炉内雰囲気制御方法。(1) The furnace atmosphere gas from each zone of the continuous non-oxidizing annealing furnace is switched over time and taken into one gas analyzer for gas analysis, and based on the analysis gas component concentration at each gas analysis stage, In the furnace atmosphere control method for adjusting the concentration of gas components in the atmosphere adjustment gas, the disturbances accompanying the charging and extraction of materials to the annealing furnace are predicted,
A method for controlling the atmosphere in a continuous non-oxidizing annealing furnace, characterized in that the atmosphere adjustment gas components are corrected each time material is charged or extracted so that the disturbance is reduced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20633189A JPH03111514A (en) | 1989-08-09 | 1989-08-09 | Method for controlling atmosphere in continuous non-oxidizing annealing furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20633189A JPH03111514A (en) | 1989-08-09 | 1989-08-09 | Method for controlling atmosphere in continuous non-oxidizing annealing furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03111514A true JPH03111514A (en) | 1991-05-13 |
Family
ID=16521533
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20633189A Pending JPH03111514A (en) | 1989-08-09 | 1989-08-09 | Method for controlling atmosphere in continuous non-oxidizing annealing furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03111514A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007320575A (en) * | 2006-05-30 | 2007-12-13 | Dainippon Printing Co Ltd | Container attached to tobacco package |
| JP2008007168A (en) * | 2006-06-29 | 2008-01-17 | Dainippon Printing Co Ltd | Storage case for premium |
-
1989
- 1989-08-09 JP JP20633189A patent/JPH03111514A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007320575A (en) * | 2006-05-30 | 2007-12-13 | Dainippon Printing Co Ltd | Container attached to tobacco package |
| JP2008007168A (en) * | 2006-06-29 | 2008-01-17 | Dainippon Printing Co Ltd | Storage case for premium |
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