JPS5887232A - Direct heat treatment for hot rolled steel wire rod - Google Patents

Abstract

PURPOSE:To obtain products having uniform mechanical strength among the coils of wire rods and within the coils in the stage of transferring and cooling the wire rods in the state of superposed rings by changing cooling conditions according to the components of the billets in one lot of a converter and the finishing temp. within one lot. CONSTITUTION:A conveyor 8 for cooling is divided to, for example, 6 parts, and the respective conveyors are made independently drivable and continuously variable and controllable in speed. Blowers 20 and mist coolers 24 are provided to the respective conveyors. In order to eliminate the variation in the strength among wire rod coils, the billets in one lot are divided to the groups having the same chemical components as far as possible, and the constant temp. transformation curves corresponding to the analyzed values of the components of the respective groups are determined. On the other hand, cooling rate patterns are selected from the equationsI-VI among the tensile strength sigmatkg/mm.<2> of the wire rods, Cwt%, wind pressure Pmm.Aq. of blowers, finishing temp. T deg.C, cooling rate Cv deg.C/sec of coils, speed Vm/sec of conveyor, and mist amount Mdl/cm<2>.min. Thereafter, in order to eliminate the variation in the strength in the coils, the P, v and the mist concn. are controlled in such a way that the temp. during cooling and T by each N division of overall length of the coils coincide with the above-described patterns.

Description

【発明の詳細な説明】 本発明は熱間圧延鋼線材の直接熱処理方法に係り、％に
圧鷺後の加工熱を利用した線材コイル間および線材フィ
ル内の機械的強度のばらつきの少いオンライン熱処種方
法に＃１４する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for direct heat treatment of hot-rolled steel wire rods, which utilizes processing heat after rolling to reduce the variation in mechanical strength between coils of wire rods and within wire rod fills. Heat treatment method #14.

ビレットから圧電された纏材鯛品は、ビレットの製鋼段
階における２００１前後に達する転炉の１チヤ一ジ分に
相当する１０ツトを全く同一成分にすることは至難であ
り、そのため５００〜２０００ｋｇ範囲のビレット毎忙
圧延された線材製品は圧延終了後の熱処理を同一条件で
行っても、その機械的強度が異なることとなる。また１
ビレツト内においても仕上り温度が異なることもあって
同一強度を得るためには線材の仕上り温ｊｉｊＫ応じた
冷却速度パターンをとる必要がある。It is extremely difficult to make 10 pieces of sea bream piezoelectrically produced from billets have exactly the same composition, which corresponds to one charge of a converter that reaches around 2001 in the steelmaking stage of billets, so it is in the range of 500 to 2000 kg. Wire rod products produced by busy rolling of billets will have different mechanical strengths even if they are heat-treated under the same conditions after rolling. Also 1
In order to obtain the same strength, it is necessary to adopt a cooling rate pattern that corresponds to the finishing temperature of the wire rod, since the finishing temperature may vary within the billet.

従来の熱間圧延鋼線材のオンライン熱処理方法を第１図
によって説明する。仕上圧延機２に’Ｃ圧延された線材
４は通常ステル毫ア法と称される直接加工熱処理装置の
水冷シー７６にて温［調整された後相ムなったリング状
層でコンベア８にて搬送中に下部からブロア１０によっ
て冷風を吹込み強制空冷処理を行なういわゆるエアパテ
ンティングにより強靭なノルバイト組織が形成され高品
質の縁材製品が祷られる。しかし従来の上記熱処理は同
一サイズ、同一ロット内においては同一の冷却条件で実
施されるために、線材；イル関および線材コイル内で均
一な機械的強度を得ることが困―であり、そのため伸線
工ｓにおいて破断等の欠陥を生ずる場合もある。更にエ
アパテンティング尾端は空気による強制冷却であるため
冷却速度に限界があり、広範囲の冷却速度を得ることが
できないとい５問題もある。A conventional online heat treatment method for hot rolled steel wire will be explained with reference to FIG. The wire rod 4 that has been C-rolled by the finishing mill 2 is heated in a water-cooled sheath 76 of a direct processing heat treatment device, which is usually called the stell roll method, and then transferred to a conveyor 8 in a ring-shaped layer. A strong norbite structure is formed through so-called air patenting, in which cold air is blown from the bottom by a blower 10 during transportation to perform a forced air cooling process, resulting in a high-quality edge material product. However, since the conventional heat treatment described above is performed under the same cooling conditions for the same size and the same lot, it is difficult to obtain uniform mechanical strength within the wire rod and wire coil. Defects such as breakage may occur in the linework s. Furthermore, since the air patenting tail end is forcedly cooled by air, there is a limit to the cooling rate, and there is another problem in that a wide range of cooling rates cannot be obtained.

本発明の目的は上記従来技術の欠点を克服し、線材コイ
ル間および線材コイル内で機械的強度のばらつきがない
均一強度の線材製品を得ることかできる直接熱処理方法
を提供するＫある。SUMMARY OF THE INVENTION An object of the present invention is to overcome the above-mentioned drawbacks of the prior art and to provide a direct heat treatment method capable of obtaining a wire product with uniform strength without variations in mechanical strength between wire coils and within a wire coil.

本発明の要旨とするところは次の如（である。The gist of the present invention is as follows.

すなわち、熱関圧鷺された線材をコンベア上に相貫なり
合ったリング状態で載置しコンベアにて移送しながら冷
却し線材コイル間および線材コイル内の機械的性質を均
一とする熱関圧延騙材の直接熱処理方法において、ｌレ
ット内の前記線材木材ビレツ）ｔ−はぼ同一化学成分を
有する群毎に区分する工程と、前記ビレットの成分分析
値、融材の圧駕仕上り温度および冷却速度と機械的強度
との下記関係式より前記各群の冷却速度パターンな選定
する工程と、前記各ビレットからの線材コイルの全長な
値数に等分割し各区分毎の冷却工程中の温度および仕上
り温度を前記冷却速度パターンに合致するように冷却風
蓋、コンベア送り速度およびミストａ度を制御する工程
と、を有して成ることを特徴とする熱間圧延鋼線材の直
接熱処理方法である、 記 σｔ＝１１Ｚ５ｘｃ＋３０　　　　　−・・（１）σｔ
はＺＯＣマ＋８４　　　　　　−・・偉）σｔ−０．２
５Ｐ＋７２　　　　　　　・・・（３）σ電工０．０１
２Ｔ＋８７　　　　　−（４）ｃｖ−１７，４マ＋１．
４　　　　　　　　−（５）Ｍｄ Ｃｙ−９３３ｅ　　　−８ａｌ　　Ｂ　　　　　−（８
）（１）、（２）、（３）、（４）、（５）、（６）弐
において、σｔ：抗張力（”ｇ／、ｄｌ） Ｃ：ビレット中のＣ含有量（重量％） Ｐ　ニブ胃ア風圧（ｍｉ水柱） Ｔ　：仕上り＠度（℃） Ｃｖ：線材コイルの冷却速度（℃／５ｅｅ）マ　：コン
ベア速度（℃／ｓｅｅ） Ｍｄ：ミスト蓋（’／ａＭ　・ｍｉｎ　）本発明の詳細
な説明および実施態様を添付図面を参照して説明する。In other words, hot rolled wire is placed on a conveyor in the form of interlocking rings and cooled while being transferred by the conveyor to make the mechanical properties uniform between wire coils and within the wire coil. In the method for direct heat treatment of fake lumber, the step of dividing the wire rod wood billets in Llets into groups having approximately the same chemical composition, the component analysis values of the billets, the compaction finishing temperature of the melted material, and the cooling. The process of selecting the cooling rate pattern for each group from the following relational expression between speed and mechanical strength, and dividing the wire rod coil from each billet into equal numbers of total length values, and determining the temperature during the cooling process for each section. A method for direct heat treatment of hot-rolled steel wire, comprising the steps of: controlling a cooling air cover, conveyor feed rate, and mist a degree so that the finishing temperature matches the cooling rate pattern. , σt=11Z5xc+30 −...(1) σt
is ZOC ma+84 -... great) σt-0.2
5P+72 ... (3) σ Electric Works 0.01
2T+87-(4)cv-17,4ma+1.
4-(5)Md Cy-933e-8al B-(8
) (1), (2), (3), (4), (5), (6) 2, σt: Tensile strength ("g/, dl) C: C content in billet (wt%) P Nib gastric wind pressure (mi water column) T: Finish @ degree (°C) Cv: Cooling rate of wire coil (°C/5ee) M: Conveyor speed (°C/see) Md: Mist lid ('/aM ・min) Invention A detailed description and embodiments of the invention will now be described with reference to the accompanying drawings.

先ず、線材コイル間の機械的強度のばらつきをなくすた
め２００　　前後の転炉の１チヤ一ジ分に相当する１０
ツト内のビレットを可能な限り同一化学成分を有するＰ
Ｋ区分する０次に各群毎にビレットでの成分分析を行な
い、その結果から各成分分析値に応じた第２ＥＫ示す如
き恒温変態曲線を決定する。一方、熱間圧延鋼線材の直
接熱処理時において、線材の抗張力ｕ　ｔと線材の０％
、冷却速度Ｃｖ、ブロア風圧Ｐ、仕上り温度Ｔとの閾に
は、それぞれ縞３図囚、（ロ）、０．０に示す如き関係
があり、冷却速度Ｃｖとコンベア速度Ｖおよびミスト蓋
Ｍｄとの関にはそれぞれ■、０に示す如き関係がある。First, in order to eliminate variations in mechanical strength between the wire coils, we used 1000 yen, which is equivalent to one charge in a converter of around 200 yen.
P having the same chemical composition as possible for the billets in the tube
A component analysis is performed on the billet for each group divided by K, and from the results, a constant temperature transformation curve as shown in the second EK is determined according to each component analysis value. On the other hand, during direct heat treatment of hot-rolled steel wire, the tensile strength u t of the wire and 0% of the wire
, the thresholds of the cooling rate Cv, the blower wind pressure P, and the finishing temperature T have a relationship as shown in Figure 3, (b), and 0.0, respectively, and the cooling rate Cv, conveyor speed V, and mist lid Md have the following relationships. There are relationships as shown in ■ and 0, respectively.

すなわちＣ−α３〜１．０％の範囲におい【（１）式が
成立し、Ｃｙ”６〜ｂ におイテ（２Ｊ式が成立し、Ｐ　＝　１００〜１６０　
ｐＭｌ水柱の範ｌｉ！８において（３）式が成立し、Ｔ
−８５０〜１０００℃の範囲において（４）式が成立し
、ＣマとＶとの関において（５）式が成立し、ＣマとＭ
４との間において（６）式が成立する。これらの関係お
よび前記恒温変態曲線から第４図Ａ曲１１にて示す如ぎ
基準となるべき冷却速度パターンを設定する。That is, in the range of C-α3 to 1.0%, [Equation (1) holds true, and it holds true for Cy''6 to b (2J formula holds, P = 100 to 160
pMl water column range li! 8, equation (3) holds true, and T
Equation (4) holds true in the range of -850 to 1000°C, and equation (5) holds true between Cma and V.
4, equation (6) holds true. Based on these relationships and the isothermal transformation curve, a cooling rate pattern to be used as a reference is set as shown in curve A 11 of FIG. 4.

次に同一ビレットによる線材コイル内の機械的強度のば
らつきを無くすため、線材；イル全長を複数に等分割し
、例えば全長なＮ分割し、各ｌハ長さ毎に代表温度を仕
上げ圧電直後および；イル冷却搬送途中の各ゾーン毎に
測温し、設定した基準となる冷却速度パターンに合致す
るように冷却風蓋、コンベア送り速度および々スト濃度
をフィードバック、フィードフォワード制御を行なう。Next, in order to eliminate variations in mechanical strength within the wire coil made of the same billet, the entire length of the wire is divided into multiple equal parts, for example, divided into N parts, and the representative temperature is determined for each length. ; The temperature is measured in each zone during the cooling conveyance, and feed forward control is performed by feeding back the cooling air cover, conveyor feeding speed and density so as to match the set standard cooling rate pattern.

上記制御を行なうために第１図に示した従来のクーリン
グコンベア８上の搬送中の融材４に対し強制空冷処理を
行なうフロア１００代りに可変電圧および可変周波数制
御（ＶＶＶＦＩＩ′Ｑ御）を行い得る第５図に示す如き
空気冷却プ訪ア２０を設け、風量を任意にロエ変とする
。In order to perform the above control, variable voltage and variable frequency control (VVVFII'Q control) is performed instead of the floor 100 that performs forced air cooling on the melt 4 being conveyed on the conventional cooling conveyor 8 shown in FIG. An air cooling fan 20 as shown in FIG. 5 is provided, and the air volume is arbitrarily varied.

更に冷却プロア２０の吐出側ダクト２２の側方もしくは
下部に？スト冷却装置２４を設け、吐出側ダクト２２中
に噴霧状ミストの吹込みを行ない、従来装置以上に強冷
却を行うことができるよう圧した。このミスト冷却装置
２４は、吹込む２スト量はプロア２０よりの風量に対応
して増減できる比例制御および搬送する線材４の温度、
成分分析１’［Ｋ応じてミスＦ濃度を制御し得る機能を
有している。Furthermore, on the side or lower part of the discharge side duct 22 of the cooling prower 20? A mist cooling device 24 was installed, and atomized mist was blown into the discharge side duct 22 under pressure to achieve stronger cooling than conventional devices. This mist cooling device 24 has proportional control in which the amount of two strokes blown can be increased or decreased in accordance with the air volume from the proar 20, and the temperature of the wire rod 4 to be conveyed.
Component analysis 1' [K has a function of controlling the MisF concentration according to K.

次に本発明では線材コイルの１ビレット分全長なＮ分割
し、線材コイル内の機械的強度のばらつきを無くすため
クーリングコンベアなＮ分割し、各コンベアの速度制御
方式はワードレオナード制御を行ない連続的に速度変動
が行い得る機構とした。第５図には従来のクーリングコ
ンベア８を６分割し各々単独で駆動され、それぞれ前記
ブロア２Ｇ、ミスト冷却装置２４を有する；／ベア８Ａ
。Next, in the present invention, the wire rod coil is divided into N parts each having the full length of one billet, and in order to eliminate variations in mechanical strength within the wire rod coils, it is divided into N parts using cooling conveyors, and the speed control method of each conveyor is Ward Leonard control. The mechanism was designed to allow speed fluctuations. In FIG. 5, a conventional cooling conveyor 8 is divided into six parts, each of which is driven independently, and each has the blower 2G and a mist cooling device 24; / Bear 8A
.

８Ｂ、８Ｃ，８Ｄ、８Ｅ、ｇＦを設けた実施例を示した
。An example in which 8B, 8C, 8D, 8E, and gF were provided was shown.

かくの如くして冷却工程中の分割された各コンベア８°
Ａ〜８Ｆ上を搬送される線材４の温度および仕上り温度
を第４図に示す如き冷却速度パターン人に合致するよう
に各コンベアにて冷却風量、ミスト＃度およびワードレ
オナード制御による；ンペア速度を制御することにより
冷却速度パターンＡに極めて近似する制御冷却曲線Ｂを
得ることができ、線材；イル関および線材コイル内の機
械的強度のばらつきを最少限に抑制することができた。In this way, each divided conveyor 8° during the cooling process.
The temperature and finish temperature of the wire rod 4 conveyed on A to 8F are controlled by the cooling air volume, mist degree, and Ward Leonard control on each conveyor to match the cooling rate pattern shown in Figure 4. By controlling it, it was possible to obtain a controlled cooling curve B that was very close to the cooling rate pattern A, and it was possible to suppress variations in mechanical strength within the wire rod and wire coil to a minimum.

本発明の実施練機を更に詳細ＫＩＩｖ４する。線材製品
の木材ビレット１童をＷ−とする、線材；イル４の温度
測定はラインの全長に夏って行なうが、この線材コイル
４の全長なＮ等分し、Ｗ／Ｎ毎の平均温度を図示しない
計算機で求め、その値を代表値とする。温度測定は第１
図に示す如く、圧電の仕上り温度を温度針１２で測定し
、水冷ゾーン６を通過した線材４の温度は温度計１４で
測定する。The practicing machine of the present invention will be described in further detail KIIv4. The temperature of the wire rod 4 is measured along the entire length of the wire rod product, where the wood billet 1 of the wire rod product is designated as W-. is calculated using a calculator (not shown), and that value is taken as the representative value. Temperature measurement is the first
As shown in the figure, the finished temperature of the piezoelectric is measured with a temperature needle 12, and the temperature of the wire 4 that has passed through the water cooling zone 6 is measured with a thermometer 14.

本発明により６分割されたｔＩｉ５図で示す実施例では
コイル搬送コンベア８Ａ〜８Ｆで搬送されつつ強制冷却
が行なわれている線材；イル４の温度はそれぞれ各分割
コンベア８Ａ〜８Ｆの出側の温度計１６Ａ、　１　ｇＩ
Ｂ、　１６Ｃ，１＠Ｄ、　１　ｓｇ、ｔｓＰＫよって測
温される。不発１１においても第１図に示す仕上圧延機
２にて圧延された線材４がステル毫ア法による水冷ゾー
ン６にて温度調整されるまでの装置および工程は従来法
と同一であり、温度計１２により水冷ゾーン６の水量制
御が行なわれ、水冷ゾーン６出儒における線材コイル４
の温度は一定に保たれる。しかし、水冷シー７６出側の
８５０〜９００℃範囲の温度域における温度のばらりｔ
は線材製品の機械的強度に影響しない。In the embodiment shown in FIG. tIi5, which is divided into six according to the present invention, the wire is forcedly cooled while being conveyed by coil conveyors 8A to 8F; the temperature of coil 4 is the temperature at the exit side of each divided conveyor 8A to 8F Total 16A, 1 gI
B, 16C, 1@D, 1 sg, tsPK temperature is measured. In misexplosion 11, the equipment and process until the wire rod 4 rolled in the finishing mill 2 shown in FIG. 12 controls the amount of water in the water cooling zone 6, and the wire coil 4 in the water cooling zone 6 is
temperature is kept constant. However, the temperature variation in the temperature range of 850 to 900°C on the exit side of the water cooling seam 76
does not affect the mechanical strength of wire products.

最も重要なことは第２図にて示される直接）（テンテイ
ンダ（ＤＰ）および空気パテンティング（ＡＰ）の冷却
曲線において、８００〜４５０℃の範囲の温度履歴であ
って、これが線材の機械的強度を決定する要因となるこ
とは周知のとおりである。The most important thing is the temperature history in the range of 800 to 450°C in the cooling curves of direct (DP) and air patenting (AP) shown in Figure 2, which determines the mechanical strength of the wire. It is well known that this is a determining factor.

仕上圧延機２の最終スタンドのロール回転数をパルスイ
ネレータ−１８で測定し、製品サイズに応じてＷ／Ｎ　
（ｋｇ　）　Ｋ相当する長さを検出し、温度計１４で連
続的に測定している温度から計算機により平均温ｆを求
めてＮ分割された長さの部分Ｗ／Ｎ　（Ｉｌｇ　）部の
温度とする。かくの如くして線材の全長のＷ／Ｎ　（ｋ
ｇ　）毎の平均温度をｔｌ、ｔ８・・・１）（とじて検
出する。同様にＮ分割されたフィル搬送コンベア８＾〜
８Ｐにおいて、各分割コンベアの出側に設けたそれぞれ
の温度計１６Ａ〜１６Ｆで連続的に測温している温度よ
り計算機によりＷ／Ｎ（−）毎の平均温度を求め制御信
号として出す。The roll rotation speed of the final stand of the finishing rolling mill 2 is measured by the pulse generator 18, and the W/N is adjusted according to the product size.
(kg) Detect the length corresponding to K, calculate the average temperature f using a computer from the temperature continuously measured with the thermometer 14, and calculate the temperature of the part W/N (Ilg) of the length divided into N. shall be. In this way, the total length of the wire W/N (k
tl, t8...1) (closed and detected. The fill conveyor 8^~ which is similarly divided into N parts)
At 8P, the average temperature for each W/N (-) is determined by a computer from the temperatures continuously measured by the respective thermometers 16A to 16F provided on the exit side of each divided conveyor, and is output as a control signal.

制御信号を出す時間間隔なΔＴ　（ｌｅｅ　）とし、分
割コンベア長さ　　：ｊｌ（ｍ） コイル直径　　　　　＝Ｄ（鵬） コイルピッチ　　　　：Ｐ（ｍ） コンベア搬送速［：マ（ｍ／１ｅｃ） 線材直径　　　　　　：ｄ（謙） １分割分の線材長さ　：Ｌ（ｍ） コンベア上の１分割分のコイルリング数　二ＩＩＷ／Ｎ
冨Ｗ（−）とすれば、 ただしρ：＊材の比重 　　　　Ｌ ΔＴ　３Ｉ、　Ｘπ−”’ 従って１６Ａ〜１６Ｆの各温襄計味、線材コイル４の先
端を検出後ΔＴ（Ｓｅｃ）のピッチ毎に平均温度を制御
信号として出せばよいこととなる。The time interval for issuing the control signal is ΔT (lee), and the divided conveyor length: jl (m) Coil diameter = D (peng) Coil pitch: P (m) Conveyor conveyance speed [:ma (m/1ec) Wire diameter: d (ken) Wire length for 1 division: L (m) Number of coil rings for 1 division on the conveyor 2IIW/N
If the thickness is W (-), then ρ: *Specific gravity of material L ΔT 3I, All that is required is to output the average temperature as a control signal.

更に既に説明した如く線材コイルの機械的強度σｔＫ及
ぼすＣ含有量、冷却速度Ｃｖ、ブロアの風圧Ｐ１仕上り
温度Ｔとの関係はそれぞれ（１）、（２）、（ａ）、　
（４）式にて示され、冷却速度Ｃｖとコンベア速度Ｖと
の関係は俤）式で、冷却速Ｋｅｙとミスト量Ｍｄとの関
係は（６２式で表わされるので、これらの関係式を用い
て第４図で示される選定された蓬準冷却曲−ＡＫ可能な
限り近似するように冷却速度を制御し制御冷却−ｄＢを
得るものである。Furthermore, as already explained, the relationships between the mechanical strength σtK of the wire coil, the C content, the cooling rate Cv, the blower wind pressure P1 and the finishing temperature T are (1), (2), (a), respectively.
The relationship between the cooling rate Cv and the conveyor speed V is expressed by Equation (4), and the relationship between the cooling rate Key and the mist amount Md is expressed by Equation (62), so using these relational expressions, The cooling rate is controlled to approximate the selected standard cooling curve -AK as much as possible, as shown in FIG. 4, to obtain a controlled cooling -dB.

第６図はミスト量およびミスト濃度制御装置を示す模式
図である。すなわち、各コンベア８Ａ〜８Ｆの下方の冷
却プμア２００側方もしくは下部にミスト発生装置２４
を設は両者なｉキ？−２６で水と空気の割合すなわちミ
スト濃度が設定値になるように混合してずスト２８とし
てダクト２２に送り込むものであって、ダクト２２には
空気、ミストのいずれか単独でも送り込めるようにダン
パー３０が設けられている。FIG. 6 is a schematic diagram showing a mist amount and mist concentration control device. That is, the mist generator 24 is installed on the side or below the cooling pool 200 below each conveyor 8A to 8F.
Should both be set up? -26, the ratio of water and air, that is, the mist concentration, is mixed to the set value, and then the mixture is sent to the duct 22 as a mist 28, and either air or mist can be sent to the duct 22 alone. A damper 30 is provided.

上記線材コイルの冷却速度の制御方法を具体的に説明す
る。The method for controlling the cooling rate of the wire coil will be explained in detail.

ビレットの化学成分および線材直径ｄより上記計算機か
ら所定の機械的強度を得るべき基準冷却曲線Ａが指示値
として与えられる。圧地終了後および水冷ゾーン６によ
る水冷後の温度がそれぞれ温度計１２および１４より出
力されるが、温度針１４の出力値より本発明による冷却
曲線の制御が開始される。コイル先端よりΔＴｌ　（１
ｌｅｃ　）経過後の線材４の温度が温度計１６Ａで測温
され、図示されていない計算機でΔＴ１間の平均温度が
出力されるので第４図で示される晶準冷却曲＠Ａ上の温
７１１６Ａｔ、と測定した平均温度１６Ａｔ、を比較す
る。乙の時の温度差Δｔ、”１　ｓＡｔｍ−１ｓＡｔ、
に応じて先ず次の搬送コンベア８Ｂのオス）　ＩＩｉ［
Ｍｄで制御できるか否かな前記（６）式と設備能力より
判断しΔｔ１が正であれば冷却速Ｊｆ　Ｃｖを緩やかｋ
する方向、すなわち第６図に示す叱キサ−２６に入って
来る水と空気の量を流量制御弁２０Ａ、２４Ａを絞るこ
とにより減少させるか、または水と空気の比を変えるた
めＫいずれかの弁を絞る。このミスト量の制御で制御し
得ない範囲の温度差であると、次の制御因子としてコン
ベア速度Ｖおよびブロア風圧Ｐを（５）および（３）式
を用い【制御する。すなわち、Δ１１が正であればコン
ベア速度Ｖおよびプロア風圧Ｐを減少させる。この値は
Δ１．の値に応じて冷却−線制御用コンピュータにプロ
グラミングされており、Δｔ１および仕上り温［ＴＩＫ
応じて出力される。このコンピュータにて計算された値
は出力としてコイル搬送コンベア８８に与えられる。Based on the chemical composition of the billet and the wire diameter d, the reference cooling curve A for obtaining a predetermined mechanical strength is given as an instruction value by the above-mentioned calculator. The temperature after completion of compaction and after water cooling in the water cooling zone 6 is output from the thermometers 12 and 14, respectively, and the control of the cooling curve according to the present invention is started from the output value of the temperature needle 14. ΔTl (1
lec) The temperature of the wire 4 after the lapse of time is measured by the thermometer 16A, and the average temperature during ΔT1 is output by a calculator (not shown), so the temperature on the crystal quasi-cooling curve @A shown in FIG. 4 is 7116At. , and the measured average temperature of 16 At. Temperature difference Δt at time B, “1 sAtm-1sAt,
IIi[
Judging from equation (6) above and the equipment capacity whether or not it can be controlled by Md, if Δt1 is positive, the cooling rate Jf Cv should be moderated k
In order to reduce the amount of water and air entering the squirter 26 shown in FIG. 6 by throttling the flow control valves 20A and 24A, or to change the ratio of water and air, Squeeze the valve. If the temperature difference is in a range that cannot be controlled by controlling the amount of mist, the conveyor speed V and blower wind pressure P are controlled as the next control factors using equations (5) and (3). That is, if Δ11 is positive, the conveyor speed V and the proer wind pressure P are decreased. This value is Δ1. The cooling line control computer is programmed according to the value of Δt1 and the finishing temperature [TIK
will be output accordingly. The value calculated by this computer is given to the coil conveyor 88 as an output.

次に温度針１６８ＩＣて＃Ｊｉ！されたコイル先端から
ΔＴ、（Ｓｃｃ）間の平均温巻が計算機より出力され、
同様に第４図で示される基準冷却曲巌Ａ上の１Ｍｆ１６
ｎｔ１と測定した平均温［１６Ｂｔ、とを比較し、その
温度差Δｔｌ−１５ａｔｌ−１６８ｆｔが正であれば上
記と同様の制御が行なわれ、その計算値がコイル搬送コ
ンベア８ＣＫ指示される。Next, temperature needle 168IC #Ji! The average temperature winding from the tip of the coil to ΔT, (Scc) is output from the computer,
Similarly, 1Mf16 on the standard cooling curve A shown in FIG.
nt1 and the measured average temperature [16 Bt] are compared, and if the temperature difference Δtl-15atl-168ft is positive, the same control as above is performed, and the calculated value is instructed to the coil conveyor 8CK.

反対にΔｈが負であると前記制御要素の建スト蓋Ｍｄ、
：ｙｙベア速ｆＶ、プロア風圧Ｐを逆）値、すなわち冷
却を強める方向に制御する。この値＆ま上記温度差△ｔ
！、仕上り＠度Ｔ！に応じて冷却曲線制御用コンピュー
タにて計算され出力される。On the other hand, if Δh is negative, the control element's erected lid Md,
:yy Bear speed fV and Proa wind pressure P are controlled to inverse) values, that is, in a direction that strengthens cooling. This value & the above temperature difference △t
! , Finish @ degree T! The cooling curve control computer calculates and outputs the cooling curve accordingly.

かくの如（、各温度計１６Ａ〜１６Ｆの温度検出が制御
すべき温度域４５０℃以下になるまで継続され、指示値
として与えられた第４図で示す基準冷却曲線人に実績値
が各温度測定点で合致するようにミスト量Ｍｄ、コンベ
ア速度マおよびプロア風圧Ｐな制御する。上記制御によ
りビレットの成分分析値および熱間仕上り温度Ｔのばら
つきを線材コイル４の冷却速度を制御することＫより吸
収し、均一な機械的強度を有する線材；イルを得ること
が可能となった。As described above, the temperature detection of each thermometer 16A to 16F continues until the temperature range to be controlled falls below 450°C, and the actual value is determined by the standard cooling curve shown in Figure 4 given as the indicated value for each temperature. The mist amount Md, conveyor speed Md, and proer wind pressure P are controlled so that they match at the measurement points.The above control controls the variation in the component analysis value of the billet and the hot finishing temperature T by controlling the cooling rate of the wire coil 4. It has become possible to obtain a wire rod that absorbs more water and has uniform mechanical strength.

上記実施態様より明らかな如く、線材コイルの熱処坤は
従米同−サイズ、同−四ット内では同一の冷却条件で実
施していたが、実際は同一ロット内でも線材成分分析値
および熱間仕上り温度にばらつきがあり、従って日ット
全体として均一な機械的強度を保証し得なかった欠点を
、不発ｆ！ＡＫよる方法によって解消することができ、
同一ロット内の線材コイル間および縁材コイル内で機械
的強度のばらつきの極めて少い線材を供給することがで
きる効果を収めた。As is clear from the above embodiment, the heat treatment of wire rod coils was carried out under the same cooling conditions within the same size and four tons, but in reality, even within the same lot, the wire rod component analysis value and the hot temperature The disadvantage of not being able to guarantee uniform mechanical strength as a whole due to variations in the finishing temperature is due to unexploded f! It can be resolved by the AK method,
We have achieved the effect of being able to supply wire rods with very little variation in mechanical strength between wire rod coils and within edge material coils in the same lot.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は熱間圧延鋼線材の直接熱処理の従来方法および
装置を示す模式断面図、第２図は蔦炭素鋼の恒温妾変態
曲線ならびに線材に圧延彼の冷却速度パターンの一例を
示す線図、第３図（イ）、（Ｂ）、（ｑｌｏ、（勾、（
ト）はそれぞれ線材の直接熱処理時の抗張力と含有Ｃ％
、抗張力と冷却速度、抗張力とプロア風圧、抗張力と仕
上り温度、線材冷却時の冷却速度とコンベア速度、冷却
速度とンスト菫との関係を示す線図、第４図は本発明の
線材のｉｋ接熟熱処理方法実施例における冷却制御方法
を示す冷却曲線、第５図は本発明による熱間圧延鋼線材
の直接熱処理方法の実施装置を示す模式断面図、１ｇ６
図は本発明の実施に使用するミスト発生器の構成および
作用を示す説明図である。 ２・−仕上げ圧延機、４・・・線材 ６・−水冷ゾーン、　８・・・縁材搬送コンベア８Ａ、
８Ｂ、８０，８Ｄ、８Ｅ、８Ｆ・・・分割コンベア１０
・・・空冷プロア １２．１４．１６Ａ１１６Ｂ％　１＠Ｃ，１ｓＤ。 １６Ｅ、１６Ｆ・・・眞度計 ２０・・・空冷プロア、２４・・・オスト発生器２６・
・・ミキサー、　　２８・・・ミスト代理人　　中　路
　武　雄 第１図 Ｉり 第２図 時間（聞Ｃ）Figure 1 is a schematic cross-sectional view showing a conventional method and apparatus for direct heat treatment of hot-rolled steel wire, and Figure 2 is a diagram showing an example of the isothermal transformation curve of carbon steel and the cooling rate pattern of the wire rod. , Figure 3 (A), (B), (qlo, (gradient, (
g) are the tensile strength and C% content during direct heat treatment of the wire rod, respectively.
, a diagram showing the relationship between tensile strength and cooling rate, tensile strength and proa wind pressure, tensile strength and finishing temperature, cooling rate and conveyor speed during wire cooling, cooling rate and instant violet, Figure 4 shows the ik contact of the wire of the present invention. Cooling curve showing the cooling control method in the embodiment of the ripe heat treatment method, FIG. 5 is a schematic cross-sectional view showing the implementation apparatus of the direct heat treatment method for hot rolled steel wire according to the present invention, 1g6
The figure is an explanatory diagram showing the configuration and operation of a mist generator used in implementing the present invention. 2.-Finish rolling machine, 4.-Wire rod 6.-Water cooling zone, 8..Edge material conveyor 8A,
8B, 80, 8D, 8E, 8F...Divided conveyor 10
...Air-cooled Proa 12.14.16A116B% 1@C, 1sD. 16E, 16F... Accuracy meter 20... Air cooling proa, 24... Ost generator 26.
...Mixer, 28...Mist agent Takeo Nakaji Figure 1 Figure 2 Time (Library C)

Claims (1)

【特許請求の範囲】[Claims] （１）　　熱間圧延された線材をコンペア上に相重な。 り合ったリング状態で載置しコンペアにて移送しながら
冷却し線材コイル間および線材フィル内の機械的性質を
均一とする熱間圧延線材の直接熱処理方法において、１
０ツト内の前記線材素材ビレットをほぼ同一化学成分を
有する群毎に区分する工程と、前記ビレットの成分分析
値、線材の圧嶌仕上り温度および冷却速度と機械的強度
との下記関係式より前記各群の冷却速度パターンを選定
する工程と、前記各ビレットからの線材コイルの全長を
複数に等分割し各区分毎の冷却工程中の温度および仕上
り温度を前記冷却速度パターンに合致するように冷却風
量、コンベア送り速度およびオス）ｍｌ＆な制御する工
程と、を有しズ成ることを特徴とする熱間圧延鋼線材の
直接熱処理方法。 配 ｆｆ１−１　１ｚｓｘｃ＋ａｏ　　　　　　　・　（１
）σｔ−ＺＯＣｖ＋８４　　　　　　　　　　＋・・（
２）σｉ−０．２５Ｐ＋７２　　　　　　　　　・・・
（３）Ｃ重　■　α０１２Ｔ＋８７　　　　　　　　　
　・・・（４）Ｃｖ−１７，４Ｙ＋１４　　　　　　　
　−（５）４ Ｃｙ＝９１３　ｅ　　　−８１１３・・・（６）（１１
，ｈ（２）、（３）、（４）、（５）、（６）式におい
て、＃ｔ：抗張力（”ｇ／−） Ｃ：ビレット中のＣ含有量（重量％） Ｐ　ニブロア風圧（−水柱） Ｔ　：仕上り温ｉＥ（℃） Ｃｖ：線材コイルの冷却速度（℃／　Ｉｅｃ　）マ　：
３ノベア速度（１７口（） Ｍｄ　：　＃スト量（’／ａｌｌ・ｍｉｎ　）(1) Hot-rolled wire rods are stacked on a comparer. In a direct heat treatment method for hot-rolled wire rods, in which the mechanical properties between the wire coils and within the wire rod fill are made uniform by cooling the wire rods by placing them in a matched ring state and transferring them by a comparer.
From the step of dividing the wire material billets in the 0-piece into groups having almost the same chemical composition, and the following relational expression between the component analysis value of the billet, the compression finishing temperature and cooling rate of the wire material, and the mechanical strength, A process of selecting a cooling rate pattern for each group, dividing the entire length of the wire rod coil from each billet into multiple equal parts, and cooling the temperature during the cooling process and finishing temperature of each division to match the cooling rate pattern. 1. A method for direct heat treatment of hot-rolled steel wire, comprising a step of controlling air volume, conveyor feed rate, and (m). Distribution ff1-1 1zsxc+ao ・ (1
) σt-ZOCv+84 +...(
2) σi-0.25P+72...
(3) C weight ■ α012T+87
...(4)Cv-17,4Y+14
-(5)4 Cy=913 e -8113...(6)(11
, h (2), (3), (4), (5), (6) where #t: Tensile strength (''g/-) C: C content in billet (wt%) P Niblower wind pressure ( - water column) T: Finished temperature iE (°C) Cv: Cooling rate of wire coil (°C/Iec) Ma:
3 Novea speed (17 mouths () Md: #Stroke amount ('/all・min)