JP2004197118A

JP2004197118A - Method for continuously treating steel wire

Info

Publication number: JP2004197118A
Application number: JP2002363694A
Authority: JP
Inventors: Takashi Ninomiya; 敬二ノ宮; Hideo Ishida; 英男石田; Hidekazu Iwasaki; 英一岩崎; Daisaku Uno; 大作宇野
Original assignee: CHUKYO SEISEN KK; Nihon Parkerizing Co Ltd
Current assignee: CHUKYO SEISEN KK; Nihon Parkerizing Co Ltd
Priority date: 2002-12-16
Filing date: 2002-12-16
Publication date: 2004-07-15
Anticipated expiration: 2022-12-16
Also published as: JP4145136B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology in which a steel wire is descaled by electrolytic-pickling while running the steel wire, and electrically heated and annealed under a nonoxidizing atmosphere by preventing generation of sparks during electrically heating and annealing, and a technology in which the steel wire is subjected chemical conversion for lubrication while running the steel wire, or a technology in which the steel wire is drawn while running it. <P>SOLUTION: The steel wire is electrolytic-pickled while running it, electrically heated and annealed. In an electrolytic pickling step, electrodes are disposed in the order of an anode, a cathode, an anode, a cathode, an anode, and an anode from an inlet to an outlet of a pickling bath under the condition of the pickling bath in which the concentration of sulfate group is 10-30 wt.%, first iron ion concentration is 1-100 g/liter, and the bath temperature is 5-40°C, and the steel wire is indirectly energized to be electrolytic-pickled over 2.5-20 seconds with a current density of 20-200 A/dm<SP>2</SP>on the surface of the steel wire. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【産業上の利用分野】
本発明は、鋼線の連続処理方法に関するものである。
【０００２】
【従来の技術】
硬鋼線やＳＵＳ鋼線を伸線処理する場合、一般に、脱スケール→焼鈍→化成処理→潤滑処理→伸線の順で処理が行われる。
鋼線を走行させつつ脱スケールする方法として、酸洗浴中を走行する鋼線表面に電流を流す電解酸洗方法が特許文献１に開示されている。
鋼線を走行させつつ焼鈍する方法として、走行する鋼線を通電加熱する通電加熱焼鈍方法が特許文献２に開示され、走行する鋼線を無酸化雰囲気下で加熱し、次いで外面が水冷され内部が無酸化雰囲気下にあるパイプに鋼線を挿通して鋼線を冷却する無酸化焼鈍方法が特許文献３に開示されている。
亜鉛イオン２〜６０ｇ／リットル、リン酸イオン２〜８０ｇ／リットル、硝酸イオン３〜１００ｇ／リットルを含有し、リン酸イオンに対する亜鉛イオンのモル比が０．９〜１．５の処理液中に鋼線を走行させつつ、鋼線を陰極として、１〜１００Ａ／ｄｍ^２の鋼線表面での電流密度、１〜３０秒の電解時間で処理液を電解して、鋼線の表面にリン酸塩被膜を形成する方法が特許文献１に開示されている。
【０００３】
【特許文献１】
特願２０００−８０４９７号公報
【特許文献２】
特公平５−８１６４８号公報
【特許文献３】
特開昭６２−４８３４号公報
【０００４】
【発明が解決しようとする課題】
鋼線を走行させつつ、電解酸洗による脱スケール→無酸化雰囲気下での通電加熱焼鈍→化成処理→潤滑処理→伸線を連続処理できれば、従来のバッチ処理に比べて鋼線の処理効率が格段に向上する。しかし、鋼線を走行させつつ処理する従来技術は、電解酸洗による脱スケール→化成処理、又は通電加熱焼鈍単独であり、鋼線を走行させつつ、電解酸洗して脱スケールし、無酸化雰囲気下で通電加熱焼鈍する技術、或いは更に鋼線を走行させつつ化成処理し潤滑処理する技術、或いは更に鋼線を走行させつつ伸線する技術は、未だ提案されていない。その原因として、電解酸洗した鋼線を通電加熱焼鈍する際にスパークが発生して鋼線が損傷し易く、その防止が困難であったことが挙げられる。
本発明は、通電加熱焼鈍時のスパークの発生を防止することにより、鋼線を走行させつつ、電解酸洗して脱スケールし、無酸化雰囲気下で通電加熱焼鈍する技術、或いは更に鋼線を走行させつつ化成処理し潤滑処理する技術、或いは更に鋼線を走行させつつ伸線する技術を提供することを目的とする。
【０００５】
【課題を解決するための手段】
上記課題を解決するために、本発明においては、鋼線を走行させつつ、電解酸洗し、通電加熱焼鈍し、電解酸洗工程において、硫酸基濃度が１０〜３０重量％、第１鉄イオン濃度が１〜１００ｇ／リットル、浴温が５〜４０℃の酸洗浴条件下で、酸洗浴入口部から出口部へ向けて陽極、陰極、陽極、陰極、陽極、陽極の順に電極を配設し鋼線に間接通電して、２０〜２００Ａ／ｄｍ^２の鋼線表面での電流密度で、２．５〜２０秒間に亘って鋼線を電解酸洗することを特徴とする鋼線の連続処理方法を提供する。
上記条件で鋼線を電解酸洗することにより、鋼線表面を完全に脱錆、脱スケールし且つ滑らかにすることができる。完全に脱錆、脱スケールされ且つ滑らかにされた表面を有する鋼線を走行させつつ通電加熱焼鈍すると、通電ロール間で走行する鋼線の挙動が安定化し、スパークは発生しない。従って、鋼線を走行させつつ、電解酸洗し、通電加熱焼鈍する鋼線の連続処理が可能となり、鋼線の処理効率が向上する。
【０００６】
本発明の好ましい態様においては、通電加熱焼鈍工程において、無酸化雰囲気下で鋼線を通電加熱し、外面が水冷され内部が無酸化雰囲気下にあるパイプに鋼線を挿通して鋼線を冷却する。
無酸化雰囲気下で鋼線を通電加熱し、外面が水冷され内部が無酸化雰囲気下にあるパイプに鋼線を挿通して鋼線を冷却することにより、スケールを発生させることなく、鋼線を焼鈍することができる。
【０００７】
本発明の好ましい態様においては、パイプ内を走行する鋼線を支持して、鋼線とパイプ内面との接触を防止する。
鋼線とパイプ内面との接触を防止することにより、鋼線表面に擦り傷が発生するのを防止することができる。
【０００８】
本発明の好ましい態様においては、通電加熱焼鈍後、更に鋼線を走行させつつ電解化成し、潤滑処理する。
本発明の好ましい態様においては、潤滑処理後、更に鋼線を走行させつつ伸線する。
通電加熱焼鈍後、更に連続して化成処理と潤滑処理とを行い、或いは更に伸線処理を連続して行うことにより、鋼線の処理効率が向上する。
【０００９】
本発明の好ましい態様においては、電解化成工程において、亜鉛イオン２〜７０ｇ／リットル、リン酸イオン２〜１００ｇ／リットル、硝酸イオン３〜１００ｇ／リットルを含有し、リン酸イオンに対する亜鉛イオンのモル比が０．５〜１．５の処理液を電解液とし、鋼線を陰極として、１〜１００Ａ／ｄｍ^２の鋼線表面での電流密度、５０〜２００クーロンの鋼線表面でのクーロン量で電解して、鋼線の表面にリン酸塩被膜を形成する。
上記処理により、化成工程でのスラッジ発生を抑制し、且つ鋼線の伸線性を向上させることができる。
【００１０】
本発明の好ましい態様においては、電解化成工程の前工程として、チタン濃度が１〜２０ｍｇ／リットルのコロイダルチタン又は、亜鉛、カルシウム、マグネシウム、鉄の何れか一つを含有するリン酸金属塩の溶液であって金属イオン濃度が１〜１００ｍｇ／リットルの処理液、又は亜鉛、カルシウム、マグネシウム、鉄の何れか一つを含有するリン酸金属塩の微粒子であって粒径が０．０５〜５μの微粒子を含有する処理液に鋼線を接触させて鋼線を表面調整する。
上記処理により、緻密なリン酸塩被膜の形成が可能となる。
【００１１】
本発明の好ましい態様においては、潤滑処理工程において、ステアリン酸ナトリウム、ステアリン酸カルシウム、ステアリン酸亜鉛、ステアリン酸鉄の何れか一つ又は二つ以上を主成分とする粉末、又は当該粉末の５〜２０重量％水溶液、又は前記粉末の５〜２０重量％水分散液を、鋼線に塗布する。
上記処理により、高速での伸線処理が可能となる。
【００１２】
本発明の好ましい態様においては、鋼線の走行速度は１０〜２００ｍ／分である。
本発明に係る処理方法によれば、１０〜２００ｍ／分の速度で走行する鋼線を連続処理することが可能である。
【００１３】
【発明の実施の形態】
本発明の実施例に係る鋼線の処理方法を以下に説明する。
図１に本発明に係る処理方法を実施するための鋼線処理装置を示す。
鋼線処理装置は、電解酸洗装置１と、水洗装置２と、送りロール３と、チョークトランス４と、通電加熱焼鈍装置５と、水冷装置６とを備えている。
送りロール３により従動ドラム１００からから引き出された鋼線１０１が、二重矢印で示すように、電解酸洗装置１、水洗装置２中を順次走行し、次いでチョークトランス４、通電加熱焼鈍装置５、水冷装置６中を順次走行して、駆動ドラム１０２に巻き取られる。
送りロール３と駆動ドラム１０２間を走行する鋼線１０１に、適正な張力が与えられる。
【００１４】
図２に示すように、電解酸洗装置１は、電解槽１ａと、電解槽１ａ内に配設された６対の電極とを備えている。
各対の電極は、電解槽１ａ内を走行する鋼線１０１を挟んで且つ鋼線１０１から隙間を隔てて配設されている。前記６対の電極は、鋼線１０１の走行方向に関して後方から前方へ向けて陽極１ｂ、陰極１ｃ、陽極１ｄ、陰極１ｅ、陽極１ｆ、陽極１ｇの順に配設されている。
電極１ｂ、１ｃは直流電源１ｈに接続され、電極１ｄ、１ｅ、１ｆは直流電源１ｉに接続され、電極１ｇは直流電源１ｊに接続されている。直流電源１ｊの陰極は、電解槽１ａ外で電極ロール１ｋを介して鋼線１０１に接触している。
電極１ｂ、１ｃ、１ｄ、１ｅ、１ｆ、１ｇの長さは、１ｍ、１ｍ、０．５ｍ、０．５ｍ、０．５ｍ、０．５ｍに設定されている。
電解槽１ａ内の酸洗浴条件は、硫酸基濃度が１０〜３０重量％、第１鉄イオン濃度が１〜１００ｇ／リットル、浴温が５〜４０℃に設定されている。
【００１５】
水洗装置２は、鋼線１０１に沿って配設された３段の水洗ノズルを備えている。送りロール３は、鋼線１０１に沿って配設されて鋼線１０１を挟持する複数対の駆動ロールを備えている。駆動ロールは図示しないモータにより駆動される。
チョークトランス４は、鋼線１０１から漏洩した電流を除去し、鋼線１０１外への電気的影響の波及を防止する。
【００１６】
水洗装置２と送りロール３との間に、鋼線１０１を挟んで配設された複数のエアノズルからなる図示しないエアナイフが配設されている。
【００１７】
通電加熱焼鈍装置５は、図１に示すように、鋼線１０１の走行方向に関して後方から前方へ順次配設された一対の電極ロール５ａ_１と、電極ロール５ａ_２と、電極ロール５ａ_２に対峙して配設された一対の受けロール５ａ_３とを有する通電加熱装置５ａを備えている。
一対の電極ロール５ａ_１は鋼線１０１を挟持している。電極ロール５ａ_２と一対の受けロール５ａ_３とは、鋼線１０１に当接している。一対の電極ロール５ａ_１と電極ロール５ａ_２とは交流電源５ａ_４に接続されている。電極ロール５ａ_２と一対の受けロール５ａ_３とは加熱チャンバー５ａ_５内に収容されている。
通電加熱焼鈍装置５は、加熱チャンバー５ａ_５から鋼線１０１の走行方向に関して前方へ延びる冷却装置５ｂを備えている。冷却装置５ｂは内側パイプ５ｂ_１内と外側パイプ５ｂ_２とから成る二重パイプを有している。内側パイプ５ｂ_１内を鋼線１０１が走行する。
内側パイプ５ｂ_１内に、図示しないガス供給源から水素ガスと窒素ガスの混合ガスである無酸化雰囲気ガスが供給される。無酸化雰囲気ガスは、内側パイプ５ｂ_１内と加熱チャンバー５ａ_５内とに充満し、内側パイプ５ｂ_１の前端と加熱チャンバー５ａ_５の鋼線入口とから漏出する。
内側パイプ５ｂ_１と外側パイプ５ｂ_２との間に形成された環状隙間の閉鎖された前端の近傍部に図示しない給水源から冷却水が供給される。冷却水は、前記環状隙間に充満し、前記環状隙間の閉鎖された後端の近傍部から排出される。
内側パイプ５ｂ_１内に、複数のガイドローラー５ｂ_３が配設されている。ガイドローラー５ｂ_３は鋼線１０１を支持している。
【００１８】
冷却装置６は、冷却水が貯留された冷却槽を備えている。
冷却装置６と駆動ドラム１０２との間に、鋼線１０１を挟んで配設された複数のエアノズルからなる図示しないエアナイフが配設されている。
【００１９】
上記鋼線処理装置による鋼線１０１の処理を以下に説明する。
送りロール３により従動ドラム１００から引き出された鋼線１０１は、電解酸洗装置１、水洗装置２、チョークトランス４、通電加熱焼鈍装置５、水冷装置６を通って分速４０ｍで走行し、駆動ドラム１０２に巻き取られる。
送りロール３と駆動ドラム１０２間で適正な張力を印加された鋼線１０１は、真直に伸びた状態で通電加熱焼鈍装置５を通過する。
【００２０】
鋼線１０１が６秒掛かって電極１ｂ〜１ｇを通過する際に、鋼線１０１の表面は、経時的に、間接通電により陰極、陽極、陰極、陽極、陰極、陰極となる。硫酸基濃度が１０〜３０重量％、第１鉄イオン濃度が１〜１００ｇ／リットル、浴温が５〜４０℃の酸洗浴条件下で、２０〜２００Ａ／ｄｍ^２の鋼線表面の電流密度で、鋼線１０１は電解酸洗される。
陽極である鋼線１０１の表面から鉄が溶出することにより鉄錆が除去され、鋼線１０１の表面で発生した酸素ガスにより鋼線１０１表面のスケールや潤滑剤等が物理的に除去される。
陰極である鋼線１０１の表面で発生した水素ガスにより鋼線１０１表面のスケールや潤滑剤等が物理的に除去されると共に、陽極時に鋼線１０１の表面に析出した炭素が、陰極である鋼線１０１の表面で発生した水素ガスにより物理的に除去される。また、析出した鉄により陰極である鋼線１０１の表面が被覆される。
鋼線１０１表面が間接通電により経時的に陰極、陽極、陰極、陽極となって、表面の鉄錆、スケール、潤滑剤、析出した炭素等が物理的に除去されると共に、最後に２回連続して鋼線１０１表面が陰極となり、析出した鉄によって鋼線１０１表面が被覆されることにより、鋼線１０１表面が完全に脱錆、脱スケールされ且つ滑らかにされる。
【００２１】
電解酸洗装置１を通過した鋼線１０１は、水洗装置２を通って水洗され、図示しないエアナイフを通り水切りされて乾燥し、送りロール３を通り適正な張力を印加されて真直に伸ばされる。
【００２２】
真直に伸びた鋼線１０１は、通電加熱焼鈍装置５の通電加熱装置５ａを通過する際に通電加熱され、冷却装置５ｂを通過する際に急冷されて、焼鈍される。
チョークトランス４により、鋼線１０１から漏洩した電流が除去され、鋼線１０１外への電気的影響の波及が防止される。
電解酸洗装置１により、鋼線１０１表面が完全に脱錆、脱スケールされ且つ滑らかにされており、且つ送りロール３と駆動ドラム１０２とにより鋼線１０１に適正な張力が印加されて鋼線１０１が真直に伸びているので、通電加熱装置５ａを通過する際に、鋼線１０１の挙動は不安定にならない。また図示しないエアナイフにより鋼線１０１表面は完全に水切りされて乾燥している。この結果、鋼線１０１が通電加熱装置５ａを通過する際にスパークの発生が防止され、スパークによる鋼線１０１の損傷発生が防止される。
通電加熱装置５ａと冷却装置５ｂは無酸化雰囲気下にあるので、焼鈍時に鋼線１０１表面にスケールが発生するおそれは無い。ガイドローラー５ｂ_３によって、鋼線１０１が支持されることにより、鋼線１０１と内側パイプ５ｂ_１内面との接触が防止され、鋼線１０１表面での擦り傷の発生が防止される。
【００２３】
通電加熱焼鈍装置５を通過した鋼線１０１は、冷却装置６を通過して室温まで冷却され、図示しないエアナイフを通って乾燥された後、駆動ドラム１０２に巻き取られる。
【００２４】
電極１ｂ〜１ｇの長さを調整し或いは電極１ｂ〜１ｆを複数セット直列に配設し、更に直流電源１ｈ、１ｉ、１ｊの出力を調整することにより、１０〜２００ｍ／分の走行速度範囲で、２．５〜２０秒間に亘って、２０〜２００Ａ／ｄｍ^２ａの鋼線表面での電流密度で、鋼線１０１の表面を電解酸洗し、完全に脱錆、脱スケールし且つ滑らかにすることができる。
【００２５】
図１の鋼線処理装置を用い、電解酸洗装置１での電解条件を、電解浴の硫酸濃度＝２８重量％、電解浴温度＝３０℃、鋼線表面での電流密度＝２００Ａ／ｍ^２に設定し、通電加熱焼鈍装置５での雰囲気ガス供給条件を、水素ガス３０リットル／分、窒素ガス３０リットル／分に設定し、鋼線の走行速度を２１ｍ／分に設定して、複数の供試鋼線を連続して電解酸洗し、通電加熱焼鈍した。電解酸洗後の鋼線表面と通電加熱焼鈍後の鋼線表面とを目視観察した。比較例として、複数の供試鋼線を従来技術のバッチ処理で酸洗し、従来技術の焼鈍方法で焼鈍し、酸洗後の鋼線表面と焼鈍後の鋼線表面とを目視観察した。
図３に、供試鋼線の材質、線径、抗張力、鋼線処理装置における通電加熱焼装置５ａでの電流値、鋼線表面の目視観察結果を示す。図中目視観察結果欄の◎印は鋼線表面が完全に清浄で且つ滑らかであることを示し、○印は鋼線表面が略清浄で且つ滑らかであることを示し、△は鋼線表面の一部に汚れや傷や荒れがあることを示す。
図３から、図１の鋼線処理装置を用いることにより、通電加熱焼鈍時のスパーク発生を防止しつつ、走行する鋼線を、連続して電解酸洗し、通電加熱焼鈍できることが分かる。
【００２６】
鋼線１０１の走行速度に応じて、電極１ａ〜１ｇの長さを適宜変更し、或いは、鋼線１０１の走行方向に関して陽極１ｆの後方に陽極と陰極の組み合わせを一対又は複数対追加し、或いは電解酸洗装置１を直列に複数配設しても良い。
【００２７】
冷却装置６と駆動ドラム１０２との間に、表面調整装置と電解化成装置と潤滑装置とを配設し、或いは更に潤滑装置と駆動ドラム１０２との間に伸線装置を配設しても良い。電解酸洗から潤滑処理までの一貫した鋼線の連続処理が可能となり、或いは電解酸洗から伸線までの一貫した鋼線の連続処理が可能となる。この結果、鋼線の処理効率が従来のバッチ処理に比べて格段に向上する。
【００２８】
表面調整処理工程においては、チタン濃度が１〜２０ｍｇ／リットルのコロイダルチタン又は、亜鉛、カルシウム、マグネシウム、鉄の何れか一つを含有するリン酸金属塩の溶液であって金属イオン濃度が１〜１００ｍｇ／リットルの処理液、又は亜鉛、カルシウム、マグネシウム、鉄の何れか一つを含有するリン酸金属塩の微粒子であって粒径が０．０５〜５μの微粒子を含有する処理液に走行する鋼線１０１を接触させて、鋼線１０１を表面調整するのが望ましい。上記処理により、緻密なリン酸塩被膜の形成が可能となる。
化成処理工程においては、亜鉛イオン２〜７０ｇ／リットル、リン酸イオン２〜１００ｇ／リットル、硝酸イオン３〜１００ｇ／リットルを含有し、リン酸イオンに対する亜鉛イオンのモル比が０．５〜１．５の処理液を電解液とし、鋼線１０１を陰極として、１〜１００Ａ／ｄｍ^２の鋼線表面での電流密度、５０〜２００クーロンの鋼線表面でのクーロン量で電解して、鋼線１０１の表面にリン酸塩被膜を形成するのが望ましい。上記処理により、化成工程でのスラッジ発生を抑制し、且つ鋼線の伸線性を向上させることができる。
【００２９】
潤滑処理工程においては、ステアリン酸ナトリウム、ステアリン酸カルシウム、ステアリン酸亜鉛、ステアリン酸鉄の何れか一つ又は二つ以上を主成分とする粉末、又は当該粉末の５〜２０重量％水溶液、又は前記粉末の５〜２０重量％水分散液を、走行する鋼線１０１に塗布するのが望ましい。上記処理により、高速での伸線処理が可能となる。
【００３０】
【発明の効果】
上記説明から明らかなように、本発明に係る鋼線の連続処理方法では、電解酸洗工程において、硫酸基濃度が１０〜３０重量％、第１鉄イオン濃度が１〜１００ｇ／リットル、浴温が５〜４０℃の酸洗浴条件下で、酸洗浴入口部から出口部へ向けて陽極、陰極、陽極、陰極、陽極、陽極の順に電極を配設して鋼線に間接通電して、２０〜２００Ａ／ｄｍ^２の鋼線表面での電流密度で、２．５〜２０秒間に亘って鋼線を電解酸洗するので、鋼線表面を完全に脱錆、脱スケールし且つ滑らかにすることができる。
完全に脱錆、脱スケールされ且つ滑らかにされた表面を有する鋼線を走行させつつ通電加熱焼鈍すると、通電ロール間で走行する鋼線の挙動が安定化し、スパークは発生しない。
従って、鋼線を走行させつつ、電解酸洗し、通電加熱焼鈍する鋼線の連続処理が可能となる。
【図面の簡単な説明】
【図１】本発明に係る鋼線の連続処理方法を実施するための鋼線の処理装置の構成図である。
【図２】図１の処理装置が備える電解酸洗装置の構成図である。
【図３】図１の処理装置を用いて行って鋼線の処理実験の実験条件の一部と実験結果とを示す表である。
【符号の説明】
１電解酸洗装置
１ｂ、１ｃ、１ｄ、１ｅ、１ｆ、１ｇ電極
２水洗装置
３送りロール
４チョークトランス
５通電加熱焼鈍装置
６冷却装置
１００従動ドラム
１０１鋼線
１０２駆動ドラム[0001]
[Industrial applications]
The present invention relates to a method for continuously treating steel wire.
[0002]
[Prior art]
When a hard steel wire or a SUS steel wire is drawn, generally, the treatment is performed in the order of descaling → annealing → chemical conversion treatment → lubrication treatment → drawing.
As a method of descaling while running a steel wire, Patent Literature 1 discloses an electrolytic pickling method in which a current is applied to the surface of a steel wire running in a pickling bath.
As a method of annealing while running a steel wire, an electric heating annealing method of electrically heating a running steel wire is disclosed in Patent Literature 2, in which a running steel wire is heated in a non-oxidizing atmosphere, and then the outer surface is water-cooled and the inner surface is cooled. Patent Literature 3 discloses a non-oxidizing annealing method in which a steel wire is inserted into a pipe in a non-oxidizing atmosphere to cool the steel wire.
The treatment liquid contains 2 to 60 g / liter of zinc ion, 2 to 80 g / liter of phosphate ion, and 3 to 100 g / liter of nitrate ion, and has a molar ratio of zinc ion to phosphate ion of 0.9 to 1.5. While running the steel wire, the treatment solution is electrolyzed at a current density of 1 to 100 A / dm ² at an electrolysis time of 1 to 30 seconds using the steel wire as a cathode, and phosphoric acid is applied to the surface of the steel wire. Patent Document 1 discloses a method for forming a salt film.
[0003]
[Patent Document 1]
Japanese Patent Application No. 2000-80497 [Patent Document 2]
Japanese Patent Publication No. 5-81648 [Patent Document 3]
JP-A-62-4834
[Problems to be solved by the invention]
While running the steel wire, descaling by electrolytic pickling → energizing heat annealing in a non-oxidizing atmosphere → chemical conversion treatment → lubrication treatment → If wire drawing can be processed continuously, the processing efficiency of steel wire can be improved compared to conventional batch processing. Dramatically improved. However, the conventional technology of treating while running the steel wire is descaling by electrolytic pickling → chemical conversion treatment, or electric heating annealing alone. A technique for conducting electric heating and annealing in an atmosphere, a technique for performing a chemical conversion treatment and a lubrication treatment while further running a steel wire, and a technique for further drawing while further running a steel wire have not been proposed. The cause is that sparks are generated when the electrolytically pickled steel wire is annealed by heating under electric current, so that the steel wire is easily damaged and difficult to prevent.
The present invention is to prevent the occurrence of sparks at the time of electrical heating annealing, while running the steel wire, electrolytic desiccation and descaling, and the technology of electrical heating annealing under a non-oxidizing atmosphere, or further steel wire It is an object of the present invention to provide a technique of performing a chemical conversion treatment and a lubricating treatment while running, or a technique of further drawing while running a steel wire.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, in the present invention, while the steel wire is running, electrolytic pickling, electric heating annealing, and a sulfuric acid group concentration of 10 to 30% by weight in the electrolytic pickling step are performed. Under a pickling bath condition having a concentration of 1 to 100 g / liter and a bath temperature of 5 to 40 ° C., an electrode is provided in the order of an anode, a cathode, an anode, a cathode, an anode, and an anode from the pickling bath inlet to the outlet. Continuous treatment of a steel wire characterized by indirectly energizing the steel wire and electrolytically pickling the steel wire for 2.5 to 20 seconds at a current density on the surface of the steel wire of ^{20 to} 200 A / dm ^2. Provide a method.
By subjecting the steel wire to electrolytic pickling under the above conditions, the surface of the steel wire can be completely derusted, descaled, and made smooth. When energizing heating annealing is performed while running a steel wire having a completely derusted, descaled and smoothed surface, the behavior of the running steel wire between energized rolls is stabilized, and no spark is generated. Therefore, it is possible to continuously treat the steel wire subjected to electrolytic pickling and current heating and annealing while running the steel wire, and the treatment efficiency of the steel wire is improved.
[0006]
In a preferred embodiment of the present invention, in the electric heating and annealing step, the steel wire is electrically heated under a non-oxidizing atmosphere, and the steel wire is cooled by inserting the steel wire into a pipe whose outer surface is water-cooled and the inside is under the non-oxidizing atmosphere. I do.
The steel wire is heated by heating in a non-oxidizing atmosphere, and the outer surface is water-cooled. Can be annealed.
[0007]
In a preferred aspect of the present invention, the steel wire running in the pipe is supported to prevent the steel wire from contacting the inner surface of the pipe.
By preventing contact between the steel wire and the inner surface of the pipe, it is possible to prevent abrasion on the surface of the steel wire.
[0008]
In a preferred embodiment of the present invention, after the electric heating and annealing, the steel wire is further electrolytically formed while running and lubricated.
In a preferred embodiment of the present invention, after the lubrication treatment, the steel wire is drawn while traveling further.
After the electric heating annealing, the chemical conversion treatment and the lubrication treatment are further continuously performed, or the wire drawing treatment is continuously performed, thereby improving the treatment efficiency of the steel wire.
[0009]
In a preferred embodiment of the present invention, the electrolytic formation step contains 2 to 70 g / liter of zinc ions, 2 to 100 g / liter of phosphate ions, and 3 to 100 g / liter of nitrate ions, and the molar ratio of zinc ions to phosphate ions Using a treatment solution of 0.5 to 1.5 as an electrolytic solution and a steel wire as a cathode, the current density on the surface of the steel wire of 1 to 100 A / dm ² and the amount of coulomb on the surface of the steel wire of 50 to 200 coulombs Electrolysis forms a phosphate coating on the surface of the steel wire.
By the above treatment, sludge generation in the chemical conversion step can be suppressed, and the drawability of the steel wire can be improved.
[0010]
In a preferred embodiment of the present invention, as a step before the electrolytic formation step, a solution of colloidal titanium having a titanium concentration of 1 to 20 mg / liter or a metal phosphate salt containing any one of zinc, calcium, magnesium and iron A treating solution having a metal ion concentration of 1 to 100 mg / liter, or fine particles of a metal phosphate containing any one of zinc, calcium, magnesium, and iron, having a particle size of 0.05 to 5 μm. The surface of the steel wire is adjusted by bringing the steel wire into contact with the treatment liquid containing the fine particles.
By the above treatment, a dense phosphate film can be formed.
[0011]
In a preferred embodiment of the present invention, in the lubrication step, sodium stearate, calcium stearate, zinc stearate, powder containing any one or more of iron stearate as a main component, or 5 to 20 of the powder A 5% by weight aqueous solution or a 5 to 20% by weight aqueous dispersion of the powder is applied to a steel wire.
The above processing enables high-speed wire drawing processing.
[0012]
In a preferred embodiment of the present invention, the traveling speed of the steel wire is 10 to 200 m / min.
According to the processing method of the present invention, it is possible to continuously process a steel wire traveling at a speed of 10 to 200 m / min.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
A method for processing a steel wire according to an embodiment of the present invention will be described below.
FIG. 1 shows a steel wire processing apparatus for carrying out the processing method according to the present invention.
The steel wire treatment device includes an electrolytic pickling device 1, a water washing device 2, a feed roll 3, a choke transformer 4, an electric heating and annealing device 5, and a water cooling device 6.
The steel wire 101 drawn from the driven drum 100 by the feed roll 3 travels sequentially through the electrolytic pickling apparatus 1 and the water cleaning apparatus 2 as shown by the double arrow, and then the choke transformer 4 and the electric heating and annealing apparatus 5 , Sequentially run through the water cooling device 6 and wound on the drive drum 102.
An appropriate tension is applied to the steel wire 101 traveling between the feed roll 3 and the drive drum 102.
[0014]
As shown in FIG. 2, the electrolytic pickling apparatus 1 includes an electrolytic cell 1a and six pairs of electrodes disposed in the electrolytic cell 1a.
Each pair of electrodes is disposed with a steel wire 101 running in the electrolytic cell 1a interposed therebetween and with a gap from the steel wire 101. The six pairs of electrodes are arranged in the order of the anode 1b, the cathode 1c, the anode 1d, the cathode 1e, the anode 1f, and the anode 1g from the rear to the front in the running direction of the steel wire 101.
The electrodes 1b, 1c are connected to a DC power supply 1h, the electrodes 1d, 1e, 1f are connected to a DC power supply 1i, and the electrode 1g is connected to a DC power supply 1j. The cathode of the DC power supply 1j is in contact with the steel wire 101 via the electrode roll 1k outside the electrolytic cell 1a.
The lengths of the electrodes 1b, 1c, 1d, 1e, 1f, and 1g are set to 1 m, 1 m, 0.5 m, 0.5 m, 0.5 m, and 0.5 m.
The pickling bath conditions in the electrolytic cell 1a are set such that the concentration of the sulfate group is 10 to 30% by weight, the concentration of ferrous ion is 1 to 100 g / liter, and the bath temperature is 5 to 40C.
[0015]
The rinsing device 2 includes three-stage rinsing nozzles arranged along the steel wire 101. The feed roll 3 is provided along the steel wire 101 and includes a plurality of pairs of drive rolls that sandwich the steel wire 101. The drive roll is driven by a motor (not shown).
The choke transformer 4 removes a current leaked from the steel wire 101 and prevents the electric wire from spreading outside the steel wire 101.
[0016]
Between the washing device 2 and the feed roll 3, an air knife (not shown) including a plurality of air nozzles arranged with the steel wire 101 interposed therebetween is provided.
[0017]
Electrical heating annealing apparatus 5, as shown in FIG. 1, a pair of electrode rolls 5a ₁ which are sequentially arranged from the rear to the front with respect to the running direction of the steel wire 101, and the electrode roll 5a _2, opposed to the electrode roll 5a ₂ and a resistance heating apparatus 5a and a pair of receiving rolls 5a ₃ disposed in.
A pair of electrode rolls 5a ₁ is sandwiched steel wire 101. The electrode roll 5a ₂ and a pair of receiving rolls 5a _3, in contact with the steel wire 101. The pair of electrode rolls 5a ₁ and the electrode roll 5a ₂ are connected to an AC power source 5a _4. The electrode roll 5a ₂ and a pair of receiving rolls 5a ₃ are accommodated in the heating chamber 5a _5.
Electrical heating annealing apparatus 5 is provided with a cooling device 5b extending forwardly with respect to the running direction of the steel wire 101 from the heating chamber 5a _5. Cooling device 5b has a double pipe consisting of an inner pipe 5b ₁ and the outer pipe 5b ₂ Prefecture. The inner pipe 5b within _a steel wire 101 travels.
The interior pipe 5b _1, non-oxidizing atmosphere gas is a mixed gas of hydrogen gas and nitrogen gas from a gas supply source (not shown) is supplied. Non-oxidizing atmospheric gas, fills the inner pipe 5b within _a heating chamber 5a _5, leaking from the front end of the inner pipe 5b ₁ and steel wire inlet of the heating chamber 5a _5.
Cooling water from a water supply source (not shown) in the vicinity of the closed front end of the formed annular gap between the inner pipe 5b ₁ and the outer pipe 5b ₂ are supplied. Cooling water fills the annular gap and is discharged from a portion near the closed rear end of the annular gap.
The interior pipe 5b _1, are disposed a plurality of guide rollers 5b _3. Guide roller 5b ₃ supports the steel wire 101.
[0018]
The cooling device 6 includes a cooling tank in which cooling water is stored.
Between the cooling device 6 and the driving drum 102, an air knife (not shown) including a plurality of air nozzles disposed with the steel wire 101 interposed therebetween is disposed.
[0019]
The processing of the steel wire 101 by the steel wire processing apparatus will be described below.
The steel wire 101 drawn from the driven drum 100 by the feed roll 3 travels at a speed of 40 m / min through the electrolytic pickling device 1, the water washing device 2, the choke transformer 4, the electric heating and annealing device 5, and the water cooling device 6, and is driven. It is taken up by the drum 102.
The steel wire 101 to which an appropriate tension is applied between the feed roll 3 and the drive drum 102 passes through the electric heating and annealing device 5 in a state of being straightened.
[0020]
When the steel wire 101 passes through the electrodes 1b to 1g in 6 seconds, the surface of the steel wire 101 becomes a cathode, an anode, a cathode, an anode, a cathode, and a cathode over time due to indirect energization. Under a pickling bath condition of a sulfate group concentration of 10 to 30% by weight, a ferrous ion concentration of 1 to 100 g / liter, and a bath temperature of 5 to 40 ° C., a current density of a steel wire surface of ^{20 to} 200 A / dm ² was obtained. The steel wire 101 is electrolytically pickled.
Iron is eluted from the surface of the steel wire 101 serving as the anode to remove iron rust, and oxygen gas generated on the surface of the steel wire 101 physically removes scale, lubricant, and the like on the surface of the steel wire 101.
The scale and lubricant on the surface of the steel wire 101 are physically removed by the hydrogen gas generated on the surface of the steel wire 101 serving as the cathode, and the carbon deposited on the surface of the steel wire 101 at the time of the anode serves as the cathode steel. It is physically removed by the hydrogen gas generated on the surface of the wire 101. Further, the surface of the steel wire 101 serving as the cathode is coated with the precipitated iron.
The surface of the steel wire 101 becomes a cathode, an anode, a cathode and an anode with the passage of time by indirect energization, and iron rust, scale, lubricant, precipitated carbon, and the like on the surface are physically removed, and finally, two times continuously. Then, the surface of the steel wire 101 becomes a cathode, and the surface of the steel wire 101 is covered with the precipitated iron, so that the surface of the steel wire 101 is completely derusted, descaled, and smoothed.
[0021]
The steel wire 101 that has passed through the electrolytic pickling apparatus 1 is washed with water through a water washing apparatus 2, drained and dried through an air knife (not shown), and stretched straight through a feed roll 3 while applying appropriate tension.
[0022]
The straightened steel wire 101 is electrically heated when passing through the current heating device 5a of the current heating and annealing device 5, and rapidly cooled and annealed when passing through the cooling device 5b.
The choke transformer 4 removes the current leaked from the steel wire 101 and prevents the electric wire from spreading outside the steel wire 101.
The surface of the steel wire 101 is completely derusted, descaled and smoothed by the electrolytic pickling apparatus 1, and an appropriate tension is applied to the steel wire 101 by the feed roll 3 and the driving drum 102, so that the steel wire 101 Since the wire 101 extends straight, the behavior of the steel wire 101 does not become unstable when passing through the electric heating device 5a. Further, the surface of the steel wire 101 is completely drained by an air knife (not shown) and dried. As a result, when the steel wire 101 passes through the electric heating device 5a, generation of spark is prevented, and damage of the steel wire 101 due to spark is prevented.
Since the current-carrying heating device 5a and the cooling device 5b are in a non-oxidizing atmosphere, there is no possibility that scale is generated on the surface of the steel wire 101 during annealing. The guide roller 5b _3, by steel wire 101 is supported, is prevented contact between the steel wire 101 and the inner pipe 5b ₁ inner surface, the occurrence of scratches on the steel wire 101 surface is prevented.
[0023]
The steel wire 101 that has passed through the electric heating and annealing device 5 is cooled to room temperature by passing through the cooling device 6, dried through an air knife (not shown), and then wound around a driving drum 102.
[0024]
By adjusting the length of the electrodes 1b to 1g or disposing a plurality of sets of the electrodes 1b to 1f in series and further adjusting the output of the DC power supplies 1h, 1i, 1j, the traveling speed range is 10 to 200 m / min. The surface of the steel wire 101 is electrolytically pickled at a current density of ^{20 to} 200 A / dm ² a for 2.5 to 20 seconds at a current density of ^{20 to} 200 A / dm ² a, and completely derusted, descaled and smoothly. can do.
[0025]
Using the steel wire treatment apparatus of FIG. 1, the electrolytic conditions in the electrolytic pickling apparatus 1 were as follows: the sulfuric acid concentration of the electrolytic bath = 28% by weight, the electrolytic bath temperature = 30 ° C., the current density on the steel wire surface = 200 A / m ^2. And the atmosphere gas supply conditions in the electric heating and annealing apparatus 5 were set to 30 liters / minute of hydrogen gas and 30 liters / minute of nitrogen gas, and the traveling speed of the steel wire was set to 21 m / min. The test steel wire was continuously subjected to electrolytic pickling, and then electrically heated and annealed. The surface of the steel wire after electrolytic pickling and the surface of the steel wire after electrical heating annealing were visually observed. As a comparative example, a plurality of test steel wires were pickled by a conventional batch process, annealed by a conventional annealing method, and the steel wire surface after pickling and the steel wire surface after annealing were visually observed.
FIG. 3 shows the material of the test steel wire, the wire diameter, the tensile strength, the current value in the electric heating and baking apparatus 5a in the steel wire processing apparatus, and the results of visual observation of the steel wire surface. In the figure, the mark ◎ in the visual observation result column indicates that the steel wire surface is completely clean and smooth, the mark 印 indicates that the steel wire surface is substantially clean and smooth, and the mark △ indicates that the steel wire surface is substantially clean and smooth. Indicates that some parts are dirty, scratched or rough.
From FIG. 3, it can be seen that by using the steel wire processing apparatus of FIG. 1, the running steel wire can be continuously subjected to electrolytic pickling and then electrically heated and annealed while preventing spark generation during the electrically heated annealing.
[0026]
Depending on the traveling speed of the steel wire 101, the length of the electrodes 1a to 1g is appropriately changed, or one or more pairs of anodes and cathodes are added behind the anode 1f with respect to the traveling direction of the steel wire 101, or A plurality of electrolytic pickling apparatuses 1 may be arranged in series.
[0027]
A surface conditioning device, an electrolytic conversion device, and a lubrication device may be provided between the cooling device 6 and the driving drum 102, or a wire drawing device may be further provided between the lubrication device and the driving drum 102. . The continuous processing of the steel wire from the electrolytic pickling to the lubrication treatment can be performed continuously, or the continuous processing of the steel wire from the electrolytic pickling to the wire drawing can be performed continuously. As a result, the processing efficiency of the steel wire is significantly improved as compared with the conventional batch processing.
[0028]
In the surface conditioning treatment step, the titanium concentration is a solution of colloidal titanium having a concentration of 1 to 20 mg / liter or a metal phosphate containing any one of zinc, calcium, magnesium, and iron, and the metal ion concentration is 1 to 20 mg / l. It travels to a processing solution of 100 mg / liter or a processing solution containing fine particles of a metal phosphate containing any one of zinc, calcium, magnesium and iron and having a particle size of 0.05 to 5 μm. It is desirable that the steel wire 101 be brought into contact with the steel wire 101 so that the surface of the steel wire 101 is adjusted. By the above treatment, a dense phosphate film can be formed.
The chemical conversion treatment step contains 2 to 70 g / liter of zinc ion, 2 to 100 g / liter of phosphate ion, and 3 to 100 g / liter of nitrate ion, and the molar ratio of zinc ion to phosphate ion is 0.5 to 1. The electrolytic solution was used as the electrolytic solution, the steel wire 101 was used as the cathode, and the current density on the surface of the steel wire of 1 to 100 A / dm ² and the amount of coulomb on the surface of the steel wire of 50 to 200 coulomb were electrolyzed. It is desirable to form a phosphate film on the surface of the substrate 101. By the above treatment, sludge generation in the chemical conversion step can be suppressed, and the drawability of the steel wire can be improved.
[0029]
In the lubrication treatment step, a powder mainly containing any one or more of sodium stearate, calcium stearate, zinc stearate, and iron stearate, or a 5 to 20% by weight aqueous solution of the powder, or the powder Is preferably applied to the running steel wire 101. The above processing enables high-speed wire drawing processing.
[0030]
【The invention's effect】
As is apparent from the above description, in the method for continuously treating steel wire according to the present invention, in the electrolytic pickling step, the concentration of sulfate group is 10 to 30% by weight, the concentration of ferrous ion is 1 to 100 g / liter, and the bath temperature. Under an acid pickling bath condition of 5 to 40 ° C., an anode, a cathode, an anode, a cathode, an anode and an anode are arranged in this order from the inlet of the pickling bath to the outlet thereof, and indirect current is applied to the steel wire, and at a current density of steel wire surface of ~200A / dm ^2, since the electrolytic pickling of steel wires over the 2.5 to 20 seconds, the complete steel wire surface Datsusabi, to the descaling and and smooth Can be.
When energizing heating annealing is performed while running a steel wire having a completely derusted, descaled and smoothed surface, the behavior of the running steel wire between energized rolls is stabilized, and no spark is generated.
Therefore, it is possible to continuously treat the steel wire which is subjected to electrolytic pickling and current heating and annealing while running the steel wire.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a steel wire processing apparatus for performing a steel wire continuous processing method according to the present invention.
FIG. 2 is a configuration diagram of an electrolytic pickling apparatus provided in the processing apparatus of FIG.
FIG. 3 is a table showing a part of experimental conditions and experimental results of a steel wire processing experiment performed using the processing apparatus of FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Electrolytic pickling apparatus 1b, 1c, 1d, 1e, 1f, 1g Electrode 2 Water washing apparatus 3 Feed roll 4 Choke transformer 5 Electric heating and annealing apparatus 6 Cooling apparatus 100 Driving drum 101 Steel wire 102 Driving drum

Claims

While running the steel wire, electrolytic pickling, electric heating and annealing are performed, and in the electrolytic pickling process, the concentration of sulfate group is 10 to 30% by weight, the concentration of ferrous ion is 1 to 100 g / liter, and the bath temperature is 5 to 5. Under the conditions of the pickling bath at 40 ° C., the anode, the cathode, the anode, the cathode, the anode, and the anode are arranged in this order from the inlet to the outlet of the pickling bath, and the steel wire is indirectly energized to supply 20 to 200 A / dm. ^2. A method for continuously treating a steel wire, wherein the steel wire is electrolytically pickled at a current density on the surface of the steel wire for 2.5 to 20 seconds.

In the electric heating annealing step, the steel wire is electrically heated under a non-oxidizing atmosphere, and the steel wire is cooled by inserting the steel wire into a pipe whose outer surface is water-cooled and the inside is under the non-oxidizing atmosphere. 2. The method for continuously treating a steel wire according to item 1.

The method for continuously treating a steel wire according to claim 2, wherein the steel wire running in the pipe is supported to prevent contact between the steel wire and the inner surface of the pipe.

The method for continuous treatment of a steel wire according to any one of claims 1 to 3, wherein after the electric heating annealing, the steel wire is further electrolytically formed while running, and lubricated.

The method for continuously treating a steel wire according to claim 4, wherein after the lubrication treatment, the steel wire is further drawn while traveling.

In the electrolytic formation step, zinc ions are contained in an amount of 2 to 70 g / liter, phosphate ions in an amount of 2 to 100 g / liter, and nitrate ions in an amount of 3 to 100 g / liter, and the molar ratio of zinc ions to phosphate ions is 0.5 to 1.5. The electrolytic solution is used as an electrolytic solution, and the steel wire is used as a cathode. Electrolysis is performed at a current density of 1 to 100 A / dm ^{2 on} the surface of the steel wire and an amount of coulomb on the surface of the steel wire of 50 to 200 coulomb. The method for continuously treating a steel wire according to claim 4, wherein a phosphate film is formed on the steel wire.

As a preceding step of the electrolytic formation step, a solution of colloidal titanium having a titanium concentration of 1 to 20 mg / liter or a metal phosphate salt containing any one of zinc, calcium, magnesium and iron, wherein the metal ion concentration is 1 To 100 mg / liter treatment liquid or treatment liquid containing fine particles of metal phosphate containing any one of zinc, calcium, magnesium and iron and having a particle diameter of 0.05 to 5 μm. The method for continuously treating a steel wire according to claim 6, wherein the surface of the steel wire is adjusted by contacting the wire.

In the lubrication treatment step, sodium stearate, calcium stearate, zinc stearate, a powder mainly containing one or more of iron stearate, or a 5 to 20% by weight aqueous solution of the powder, The method for continuously treating a steel wire according to any one of claims 4 to 7, wherein a 5 to 20% by weight aqueous dispersion is applied to the steel wire.

The method according to any one of claims 1 to 8, wherein the traveling speed of the steel wire is 10 to 200 m / min.