JPH03210905A - Rolling method with mandrel mill - Google Patents
Rolling method with mandrel millInfo
- Publication number
- JPH03210905A JPH03210905A JP519890A JP519890A JPH03210905A JP H03210905 A JPH03210905 A JP H03210905A JP 519890 A JP519890 A JP 519890A JP 519890 A JP519890 A JP 519890A JP H03210905 A JPH03210905 A JP H03210905A
- Authority
- JP
- Japan
- Prior art keywords
- film thickness
- mandrel bar
- lubricant
- mandrel
- speed
- 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
- 238000005096 rolling process Methods 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 title claims description 26
- 239000000314 lubricant Substances 0.000 claims abstract description 56
- 239000000523 sample Substances 0.000 description 7
- 238000005259 measurement Methods 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003303 reheating Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 102100033538 Clusterin-associated protein 1 Human genes 0.000 description 1
- 101000945057 Danio rerio Clusterin-associated protein 1 homolog Proteins 0.000 description 1
- 101000945060 Homo sapiens Clusterin-associated protein 1 Proteins 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B25/00—Mandrels for metal tube rolling mills, e.g. mandrels of the types used in the methods covered by group B21B17/00; Accessories or auxiliary means therefor ; Construction of, or alloys for, mandrels or plugs
- B21B25/04—Cooling or lubricating mandrels during operation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Metal Rolling (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は潤滑剤を塗布したマンドレルバ−を挿入した中
空素管を、孔型ロールを用いて延伸圧延するマンドレル
ミル圧延方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mandrel mill rolling method in which a hollow shell into which a mandrel bar coated with a lubricant is inserted is elongated and rolled using grooved rolls.
マンドレルバ−に塗布する潤滑剤は、圧延中におけるマ
ンドレルバ−と中空素管との摩擦を低減し、マンドレル
バ−表面の損傷、焼付を防止し、また圧延後は圧延材か
らのマンドレルバ−の引抜きを容易にするためのもので
あり、これらの機能を確保するうえで潤滑剤の膜厚管理
は重要な管理項目となっている。The lubricant applied to the mandrel bar reduces the friction between the mandrel bar and the hollow tube during rolling, prevents damage and seizure of the mandrel bar surface, and makes it easier to pull out the mandrel bar from the rolled material after rolling. In order to ensure these functions, controlling the lubricant film thickness is an important management item.
ところでマンドレルバ−に塗布された潤滑剤の膜厚は、
板金潤滑剤の供給量、粘度をマンドレルバ−の寸法仕様
に合わせた所定の値に設定したとしても、塗布時のマン
ドレルバ−の移動速度、温度等によって変化する。By the way, the film thickness of the lubricant applied to the mandrel bar is
Even if the supply amount and viscosity of the sheet metal lubricant are set to predetermined values that match the dimensional specifications of the mandrel bar, they will vary depending on the moving speed of the mandrel bar during application, temperature, etc.
第７図はマンドレルバ−温度とその表面に塗布した潤滑
剤の膜厚との関係を示すグラフであり、横軸にマンドレ
ルバ−温度（”Ｃ）を、また縦軸に膜厚（μｍ）をとっ
て示しである。このグラフから明らかな如く、マンドレ
ルバ−温度が大きくなるに従って膜厚が薄くなることが
解る。Figure 7 is a graph showing the relationship between the mandrel bar temperature and the film thickness of the lubricant applied to its surface, with the mandrel bar temperature ('C) on the horizontal axis and the film thickness (μm) on the vertical axis. As is clear from this graph, as the mandrel bar temperature increases, the film thickness becomes thinner.
第８図はマンドレルバ−直径と膜厚との関係を示すグラ
フであり、横軸に直径を、また縦軸に膜厚をとって示し
である。このグラフから明らかなように直径が大きくな
るに従って膜厚が薄くなることが解る。FIG. 8 is a graph showing the relationship between mandrel bar diameter and film thickness, with the horizontal axis representing the diameter and the vertical axis representing the film thickness. As is clear from this graph, as the diameter increases, the film thickness decreases.
第９図は潤滑剤の粘度と膜厚との関係を示すグラフであ
り、横軸に粘度をまた縦軸に膜厚をとって示しである。FIG. 9 is a graph showing the relationship between the viscosity and film thickness of a lubricant, with the horizontal axis representing the viscosity and the vertical axis representing the film thickness.
このグラフから明らかなように粘度が高くなるに従って
膜厚が厚くなることが解る。As is clear from this graph, the film thickness increases as the viscosity increases.
この対策として従来にあってはマンドレルバ−の長手方
向温度分布を求め、これに基づいて潤滑剤の供給を制御
する方法（特開昭５８−１０７２０３号公報）或いはマ
ンドレルバ−の長手方向温度分布自体を均一にすべく冷
却制御する方法（特開昭６Ｌ ４２４０５号公報）等が
提案されている。Conventionally, as a countermeasure against this problem, the temperature distribution in the longitudinal direction of the mandrel bar is determined and the supply of lubricant is controlled based on this (Japanese Unexamined Patent Publication No. 107203/1983), or the temperature distribution in the longitudinal direction of the mandrel bar itself is determined. A method of controlling cooling to achieve uniformity (Japanese Unexamined Patent Publication No. 6L 42405) has been proposed.
しかし上述した方法はいずれもマンドレルバ−温度にの
み着目してこれを制御する方法であるが精細な温度調節
は難しく十分な膜厚制御が出来ないという問題があった
。However, all of the above-mentioned methods focus only on the mandrel bar temperature and control it, but there is a problem in that precise temperature control is difficult and sufficient film thickness control cannot be achieved.
本発明者等は潤滑剤の膜厚精度を高めるべく実験、研究
を行った結果、潤滑剤の供給量及びマンドレルバ−速度
を制御するのが最も効果的であることを知見した。The inventors of the present invention conducted experiments and research to improve the accuracy of the lubricant film thickness, and found that it is most effective to control the lubricant supply amount and mandrel bar speed.
第５図は潤滑剤の供給量と膜厚との関係を示すグラフで
あり、横軸に供給量を、また縦軸に膜厚（μｍ）をとっ
て示しである。このグラフから明らかな如く、供給量を
増大するに従って膜厚も増大する関係にあることが解る
。FIG. 5 is a graph showing the relationship between the amount of lubricant supplied and the film thickness, with the horizontal axis representing the supply amount and the vertical axis representing the film thickness (μm). As is clear from this graph, it can be seen that as the supply amount increases, the film thickness also increases.
第６図はマンドレルバ−速度と潤滑剤の膜厚との関係を
示すグラフであり、横軸にマンドレルバ−速度（ｍ／秒
）を、また縦軸に膜厚（μＭ）をとって示しである。グ
ラフ中○丸でプロットしたのはマンドレルバ−温度を１
００℃に、また・丸でプロットしたのはマンドレルバ−
温度を５０℃に夫々設定した場合を示している。このグ
ラフから明らかな如くマンドレルバ−速度が大きくなる
に従って膜厚が薄くなる関係にあることが解る。Figure 6 is a graph showing the relationship between mandrel bar speed and lubricant film thickness, with mandrel bar speed (m/sec) on the horizontal axis and film thickness (μM) on the vertical axis. . The circle plotted in the graph indicates the mandrel bar temperature of 1.
The mandrel bar is plotted as a circle at 00℃.
The case where the temperature was set at 50°C is shown. As is clear from this graph, as the mandrel bar speed increases, the film thickness decreases.
本発明はかかる知見に基づきなされたものであって、そ
の目的とするところは、マンドレルバー表面の潤滑剤を
所望の膜厚分布にすべく、潤滑剤塗布後の膜厚を測定し
、潤滑剤の供給量、又はこれとマンドレルバ−速度の制
御によって膜厚を目標膜厚分布に一致させ得るようにし
たマンドレルミル圧延方法を提供するにある。The present invention was made based on this knowledge, and the purpose of the present invention is to measure the film thickness after applying the lubricant in order to obtain a desired film thickness distribution of the lubricant on the surface of the mandrel bar. An object of the present invention is to provide a mandrel mill rolling method in which the film thickness can be made to match a target film thickness distribution by controlling the supply amount of or the speed of the mandrel bar.
本発明に係るマンドレルミル圧延方法は、潤滑剤を塗布
したマンドレルバ−を挿入した中空素管を、マンドレル
ミルにて圧延をする方法において、マンドレルバ−を移
動しつつその表面に潤滑剤を塗布し、塗布された潤滑剤
の膜厚を測定し、測定膜厚と予め定めた目標膜厚との偏
差を求め、これを解消するための潤滑剤の供給量を求め
、該供給量が予め定められている制御可能範囲内の値で
あれば供給量を訓節し、また制御可能範囲を越える場合
には供給量を制御可能範囲内に保持しつつマンドレルバ
−速度を制御する過程を含むことを特徴とする。The mandrel mill rolling method according to the present invention is a method in which a hollow shell into which a lubricant-coated mandrel bar is inserted is rolled in a mandrel mill, and the mandrel bar is moved while applying a lubricant to its surface. The film thickness of the applied lubricant is measured, the deviation between the measured film thickness and a predetermined target film thickness is determined, the amount of lubricant supplied to eliminate this is determined, and the amount of lubricant supplied is determined in advance. If the value is within the controllable range, the feed rate is adjusted, and if the value exceeds the controllable range, the mandrel bar speed is controlled while maintaining the feed rate within the controllable range. do.
本発明にあってはこれによって、潤滑剤の供給量とマン
ドレルノ＼−の移動速度との制御により広範囲の潤滑剤
膜厚の制御を精細に行うことが可能となる。According to the present invention, it becomes possible to precisely control the lubricant film thickness over a wide range by controlling the supply amount of the lubricant and the moving speed of the mandrel.
以下本発明をその実施例を示す図面に基づき具体的に説
明する。第１図は本発明方法を適用するマンドレルミル
及びその付属設備の模式的平面図であり、図中１はマン
ドレルバ−を示している。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on drawings showing embodiments thereof. FIG. 1 is a schematic plan view of a mandrel mill and its auxiliary equipment to which the method of the present invention is applied, and numeral 1 in the figure indicates a mandrel bar.
マンドレルバ−１は縦送り搬送ラインＡ上を縦送りされ
る過程で、途中に設けた温度計２によって全長にわたっ
てマンドレルバ−温度を測定され、次いで潤滑剤の塗布
７装置３によって軸長方向の全長にわたってその全面に
潤滑剤を塗布された後、後述する第２図に示す如き膜厚
測定器４によってその全長にわたって潤滑剤のｌＩ厚を
測定される。While the mandrel bar 1 is being conveyed vertically on the vertical conveyance line A, the temperature of the mandrel bar is measured over the entire length by a thermometer 2 installed in the middle, and then the temperature of the mandrel bar is measured over the entire length in the axial direction by a lubricant coating device 3. After the lubricant is applied to the entire surface, the lI thickness of the lubricant is measured over the entire length using a film thickness measuring device 4 as shown in FIG. 2, which will be described later.
マンドレルバ−１がテーブル５に接近するとテーブル５
上を横送りされてきてテーブル５上で待機している中空
素管Ｐと同心状に位置決めされ、軸長方向に対する相対
移動によってマンドレルノく−１が中空素管Ｐに挿入せ
しめられる。マンドレルバ−１を挿入された中空素管Ｐ
は、テープｌし５の延長上に横送りされて延伸圧延ライ
ンＢに移載され、再び軸心線方向へ向けて縦送りされ、
マンドレルミル圧延機６に通される。When mandrel bar 1 approaches table 5, table 5
The mandrel no. 1 is positioned concentrically with the hollow shell P which has been transversely fed and is waiting on the table 5, and is inserted into the hollow shell P by relative movement in the axial direction. Hollow tube P with mandrel bar 1 inserted
is transported horizontally on the extension of the tape 15, transferred to the stretching and rolling line B, and is again vertically transported in the axial direction,
It is passed through a mandrel mill rolling mill 6.
マンドレルミル圧延機６により圧延された圧延材は、マ
ンドレルバ−１と共に搬送機７上に取り出され、該搬送
機７にて横送りされてストリッパーラインＣに移載され
る。ストリッパーラインＣニオいては中空素管Ｐとマン
ドレルバ−１とヲ軸長方向に相対移動せしめて中空素管
Ｐからマンドレルバ−１が引抜かれる。マンドレルバ−
１を引抜かれた中空素管ＰはストリッパーラインＣ上を
そのまま軸心線方向に縦送りされて再加熱炉８に装入さ
れ、所定温度に加熱された後、次工程に搬送される。The rolled material rolled by the mandrel mill rolling machine 6 is taken out onto a conveyor 7 together with the mandrel bar 1, is transported laterally by the conveyor 7, and is transferred to a stripper line C. In the stripper line C, the hollow shell P and the mandrel bar 1 are moved relative to each other in the axial length direction, and the mandrel bar 1 is pulled out from the hollow shell P. mandrel bar
The hollow tube P from which the tube 1 has been drawn is conveyed vertically along the stripper line C in the axial direction, loaded into the reheating furnace 8, heated to a predetermined temperature, and then conveyed to the next process.
一方中空素管Ｐから引抜かれたマンドレルバ−１はスト
リッパーラインＣ上を縦送りされ、途中温度計９にて軸
長方向における全長の温度を測定された後、マンドレル
バ−１の冷却床ｌＯに送り込まれる。冷却床１０におい
てはマンドレルバ−１は横送りされつつ冷却されて所定
温度に迄降温され、再びマンドレルバ−１の搬送ライン
Ａに順次的に送り出されるようになっている。On the other hand, the mandrel bar 1 pulled out from the hollow tube P is fed vertically on the stripper line C, and after the temperature of the entire length in the axial direction is measured by a thermometer 9 along the way, it is sent to the cooling bed IO of the mandrel bar 1. It will be done. In the cooling bed 10, the mandrel bars 1 are cooled while being transported laterally to a predetermined temperature, and are sequentially sent out again to the conveyance line A of the mandrel bars 1.
第２図は膜厚測定器４の測定系を示すブロック図であり
、膜厚測定器は縦送り搬送ラインＡを構成するローラテ
ーブル上を移動するマンドレルバー１の移動域に対向さ
せて配設されており、マンドレルバ−１が移動してくる
と、ローラテーブル間に配設されている近接スイッチＳ
がこれを検知し、村有信号をプローブ位置制御部２１へ
出力する。FIG. 2 is a block diagram showing the measurement system of the film thickness measuring device 4, and the film thickness measuring device is arranged opposite to the moving area of the mandrel bar 1 that moves on the roller table that constitutes the vertical conveyance line A. When the mandrel bar 1 moves, the proximity switch S installed between the roller tables
detects this and outputs a Murari signal to the probe position control section 21.
プローブ位置制御部２１は磁心プローブ１５をマンドレ
ルバ−１方向へ移動せしめてマンドレルバ−１の表面に
接触させると共に、膜厚管理部２２へ膜厚データ採取指
令を送信し、膜厚測定を開始する。The probe position control section 21 moves the magnetic core probe 15 in the direction of the mandrel bar 1 to bring it into contact with the surface of the mandrel bar 1, and also sends a film thickness data collection command to the film thickness management section 22 to start film thickness measurement.
磁心プローブ１５が一定の力でマンドレルバ−１の表面
に接触せしめられると、磁心プローブ１５内の膜厚測定
部３０によって膜厚測定が行われる。即ち、交流電源た
る発振器３１より発せられる交流は所定の電圧に昇圧さ
れた後、検出部３２へ入力される。検出部３２は磁心プ
ローブ１５のコイルを通じてインダクタンス変化を検出
し、その出力信号を厚み変換器３３へ出力する。厚み変
換器３３は入力信号を厚み測定値Ｔに変換し、表示器３
４にその指度を表示する。更に厚み変換器３３は膜厚管
理部２２へ前記厚み測定値を送信する。該厚み測定値は
膜厚管理部２２においてアナログ／ディジタル変換され
、予め設定しである目標膜厚値Ｔ０と照合し、その偏差
ΔＴ （＝Ｔ Ｔｏ ）を算出し、この偏差ΔＴを解
消するに必要な潤滑剤の供給量Ｑを算出する。When the magnetic core probe 15 is brought into contact with the surface of the mandrel bar 1 with a constant force, the film thickness is measured by the film thickness measuring section 30 within the magnetic core probe 15 . That is, the alternating current generated by the oscillator 31, which is an alternating current power source, is boosted to a predetermined voltage and then input to the detection section 32. The detection unit 32 detects an inductance change through the coil of the magnetic core probe 15 and outputs the output signal to the thickness converter 33. The thickness converter 33 converts the input signal into a thickness measurement value T, and displays it on the display 3.
The index degree is displayed in 4. Further, the thickness converter 33 transmits the thickness measurement value to the film thickness management section 22. The thickness measurement value is converted from analog to digital in the film thickness management section 22, and compared with a preset target film thickness value T0 to calculate the deviation ΔT (=T To ), and to eliminate this deviation ΔT. Calculate the required lubricant supply amount Q.
次にこの供給量Ｑが潤滑剤塗布装置３の機種によって定
まる制御可能範囲Ｑｍｉｎ ＝Ｑｍａｘの範囲内か否か
を判断し、制御可能範囲内である場合は供給量Ｑに相応
する信号を塗布装置３へ出力し、潤滑剤の供給量を制御
する。また制御可能範囲を越える場合はＱｍｉｎ又はＱ
ｍａｘに相応する信号を塗布装置３へ出力すると共に、
これを越える供給量ΔＱを解消するに必要なマンドレル
バ−速度■を算出し、これをマンドレルバ−速度制御部
２４へ出力する。マンドレルバ−速度制御部２４はマン
ドレルバ−速度■を増速又は減速する。Next, it is determined whether this supply amount Q is within the controllable range Qmin = Qmax determined by the model of the lubricant applicator 3, and if it is within the controllable range, a signal corresponding to the supply amount Q is sent to the applicator. 3 to control the amount of lubricant supplied. Also, if the controllable range is exceeded, Qmin or Q
While outputting a signal corresponding to max to the coating device 3,
The mandrel bar speed ■ necessary to eliminate the supply amount ΔQ exceeding this is calculated and outputted to the mandrel bar speed control section 24. The mandrel bar speed controller 24 increases or decreases the mandrel bar speed (2).
第３図はマンドレルバ−表面に対する潤滑剤の膜厚制御
過程を示すフローチャートであり、中空素管の材質、使
用マンドレルバ−の軸長方向各部の直径、使用潤滑剤が
決まると、その組合わせに応じた目標膜厚（μｍ）が上
位の計算機によって決定され、膜厚制御装置における計
算機に入力される（ステップＳｌ）。Figure 3 is a flowchart showing the process of controlling the film thickness of lubricant on the mandrel bar surface.Once the material of the hollow tube, the diameter of each part in the axial direction of the mandrel bar to be used, and the lubricant to be used are determined, the combination of The target film thickness (μm) determined by the target film thickness is determined by the host computer and inputted to the computer in the film thickness control device (step Sl).
マンドレルバ−１は縦送りされて中空素管６に対して挿
入せしめられているが途中温度計２にて軸長方向各部の
温度を測定され、その温度分布に基づいて目標膜厚を得
るに必要な潤滑剤の供給量を求め、供給量に相応する信
号を塗布装置３に出力し、塗布装置３に対するフィード
バック制御が行われる。なお目標膜厚は何ら一定値とす
る必要はなく、予め定めた膜厚についての目標膜厚分布
として与えることとしてもよいことは勿論である。The mandrel bar 1 is fed vertically and inserted into the hollow tube 6, but the temperature at each part in the axial direction is measured by a thermometer 2 along the way, and it is necessary to obtain the target film thickness based on the temperature distribution. The supply amount of the lubricant is determined, a signal corresponding to the supply amount is output to the coating device 3, and feedback control of the coating device 3 is performed. Note that the target film thickness does not need to be a constant value at all, and it goes without saying that it may be given as a target film thickness distribution for a predetermined film thickness.
潤滑剤の塗布装置３によって潤滑剤を塗布されたマンド
レルバ−１は膜厚測定器４を通過する過程で軸長方向各
部の膜厚Ｔを測定しくステップＳ２）測定した膜厚Ｔと
目標膜厚Ｔ０との偏差ΔＴを算出し、ΔＴ＝Ｏか否か、
又はΔＴｏｏか否か、又はΔＴ＜Ｏか否かを判断しくス
テップＳ３）、ΔＴ＝０の場合にはステップＳ２に戻っ
て前述の過程を反復する。またΔＴ＞Ｏ又はΔＴ＜０の
場合には夫々に応じて次の如く制御が行われる。The mandrel bar 1 coated with lubricant by the lubricant applicator 3 passes through the film thickness measuring device 4 to measure the film thickness T at each part in the axial direction.Step S2) Measured film thickness T and target film thickness Calculate the deviation ΔT from T0, and determine whether ΔT=O or not.
Or, it is determined whether ΔToo or ΔT<O (step S3). If ΔT=0, the process returns to step S2 and the above-mentioned process is repeated. Further, in the case of ΔT>O or ΔT<0, the following control is performed depending on each case.
マンドレルバ−１に対する潤滑剤塗布装置３から供給す
べき潤滑剤の供給量ＱをＱＩに低減しくステップＳ４）
、供給量Ｑ、＜Ｑｍｉｎ（制御可能最小値）か否かを判
断しくステップＳ５） 、Ｑ＋≧Ｑｍｉｎの場合はステ
ップＳ２に戻り、またＱＩ＜ＱＩｌｉｎの場合には潤滑
剤供給量をΔＱに相当するマンドレルバ−１の送り速度
を求め、マンドレルバ−の縦送り速度を増大しくステッ
プＳ６）、ステップＳ２に戻って前述の過程を反復する
。Step S4): Reduce the supply amount Q of lubricant to be supplied from the lubricant applicator 3 to the mandrel bar 1 to QI.
, determine whether the supply amount Q is <Qmin (minimum controllable value) (step S5), if Q+≧Qmin, return to step S2, and if QI<QIlin, set the lubricant supply amount equivalent to ΔQ Then, the vertical feed speed of the mandrel bar is increased (step S6), and the process returns to step S2 to repeat the above-described process.
〔ΔＴ＜０の場合〕
ステップＳ３の判断において、ΔＴ＜Ｏの場合にはマン
ドレルバ−１に対する潤滑剤の供給量Ｑを増大してＱ２
に設定しくステップＳ７） 、ＱｚがＱ、＞Ｑｍａｘ（
制御可能最大値）か否かを判断しくステ・ノブＳ８）
、Ｑ、≦ＱＩＩａｘのときはステップＳ２に戻り、また
Ｑ、＞Ｑｍａｘのときは潤滑剤の供給量をＱｅ＋ａｘに
設定すると共に、これを越える供給量ΔＱに相当スるマ
ンドレルバ−速度を求め、マンドレルバ−の搬送速度を
小さくシ（ステップＳ９）、ステップＳ２に戻って前述
の過程を反復する。[In the case of ΔT<0] In the judgment in step S3, if ΔT<O, the amount of lubricant supplied to the mandrel bar 1 is increased Q2.
Step S7), Qz is set to Q, >Qmax(
(maximum controllable value)).
, Q,≦QIIax, the process returns to step S2, and when Q,>Qmax, the lubricant supply amount is set to Qe+ax, the mandrel bar speed corresponding to the supply amount ΔQ exceeding this is determined, and the mandrel bar speed is - the conveyance speed is decreased (step S9), and the process returns to step S2 to repeat the above-described process.
次に本発明方法と従来方法との比較試験結果を示す、従
来方法は直径１２０ｆｉのマンドレルバ−に目標膜厚５
０μ■の潤滑剤を塗布すべ（マンドレルバ−を４ｍ／秒
で移動しつつ１０１／分の割合で潤滑剤を供給して潤滑
剤を塗布したマンドレルバ−得、また本発明方法は同仕
様のマンドレルバ−表面に塗布された潤滑剤の膜厚を測
定し、潤滑剤の供給量及びマンドレルバ−速度を制御し
て潤滑剤を塗布したマンドレルバ−を得、これらのマン
ドレルバ−表面の膜厚を測定した。結果は第４図に示す
とおりである。Next, we will show the results of a comparative test between the method of the present invention and the conventional method.
A mandrel bar coated with lubricant was obtained by applying lubricant at a rate of 101/min while moving the mandrel bar at 4 m/sec. The film thickness of the lubricant applied to the surface was measured, and the lubricant supply amount and mandrel bar speed were controlled to obtain mandrel bars coated with the lubricant, and the film thickness on the surface of these mandrel bars was measured.Results is as shown in Figure 4.
第４図は横軸にマンドレルバ−の先端から後端迄の位置
を、また縦軸に膜厚（μ曽）をとって示しである。FIG. 4 shows the position from the tip to the rear end of the mandrel bar on the horizontal axis, and the film thickness (μso) on the vertical axis.
グラフ中○印でプロットしたのは本発明方法に依った場
合を、また・印でプロットしたのは従来方法によった場
合を夫々示している。このグラフから明らかなように、
従来方法に依った場合には膜厚はマンドレルバ−の中間
部では略目標膜厚に近いが先端部付近では厚く、後端部
側では逆に薄くなっているのに対し、本発明方法に依っ
た場合にはマンドレルバ−の全長にわたって略目標膜厚
に近い膜厚が得られていることが解る。In the graph, the circles plotted indicate the case based on the method of the present invention, and the plotted circles plotted with the graph indicate the case based on the conventional method. As is clear from this graph,
When using the conventional method, the film thickness is close to the target film thickness at the middle part of the mandrel bar, but it is thicker near the tip and becomes thinner at the rear end. It can be seen that in this case, a film thickness substantially close to the target film thickness was obtained over the entire length of the mandrel bar.
以上の如く本発明方法にあっては、マンドレルバ−への
潤滑剤の塗布後その膜厚を測定し、膜厚を一定にするに
必要な潤滑剤の供給量を求め、供給量が制御可能範囲内
であれば供給量を、また制御可能範囲を越える場合には
マンドレルバ−速度を変更して膜厚を制御することとし
ているから、マンドレルバ−の温度変化等の膜厚変動要
因の如何にかかわらず、膜厚の正確な設定が出来てマン
ドレルバ−自体の損傷、焼付き、管からの抜取り困難等
の不都合を解消出来る等、本発明は優れた効果を奏する
ものである。As described above, in the method of the present invention, after applying lubricant to the mandrel bar, the film thickness is measured, the amount of lubricant supplied necessary to keep the film thickness constant is determined, and the amount of lubricant supplied is within a controllable range. The film thickness is controlled by changing the supply amount if it is within the controllable range, and by changing the mandrel bar speed if it exceeds the controllable range, regardless of film thickness variation factors such as changes in mandrel bar temperature. The present invention has excellent effects, such as being able to accurately set the film thickness and solving problems such as damage to the mandrel bar itself, seizure, and difficulty in removing it from the tube.
第１図は本発明方法を適用するマンドレルミル及びその
付属設備の模式的平面図、第２図は潤滑剤の膜厚測定器
のブロック図、第３図は膜厚制御過程を示すフローチャ
ート、第４図は本発明方法と従来方法との比較試験結果
を示すグラフ、第５図は潤滑剤供給量と膜厚との関係を
示すグラフ、第６図はマンドレルバ−速度と膜厚との関
係を示すグラフ、第７図はマンドレルバ−温度と膜厚と
の関係を示すグラフ、第８図はマンドレルバ−直径と膜
厚との関係を示すグラフ、第９図は潤滑剤粘度と膜厚と
の関係を示すグラフである。
１・・・マンドレルバ−２・・・温度計 ３・・・潤滑
剤塗布装置 ４・・・膜厚測定器 ５・・・テーブル
６・・・マンドレルミル圧延機 ７・・・搬送機 ８・
・・再加熱炉 ９・・・温度計 １０・・・マンドレル
バ−冷却床１５・・・膜厚測定用のプローブFig. 1 is a schematic plan view of a mandrel mill and its auxiliary equipment to which the method of the present invention is applied, Fig. 2 is a block diagram of a lubricant film thickness measuring device, Fig. 3 is a flowchart showing the film thickness control process, and Fig. 3 is a flowchart showing the film thickness control process. Figure 4 is a graph showing the results of a comparative test between the method of the present invention and the conventional method, Figure 5 is a graph showing the relationship between lubricant supply amount and film thickness, and Figure 6 is a graph showing the relationship between mandrel bar speed and film thickness. Figure 7 is a graph showing the relationship between mandrel bar temperature and film thickness, Figure 8 is a graph showing the relationship between mandrel bar diameter and film thickness, and Figure 9 is a graph showing the relationship between lubricant viscosity and film thickness. This is a graph showing. 1... Mandrel bar 2... Thermometer 3... Lubricant applicator 4... Film thickness measuring device 5... Table
6... Mandrel mill rolling machine 7... Conveyor machine 8.
... Reheating furnace 9 ... Thermometer 10 ... Mandrel bar cooling bed 15 ... Probe for film thickness measurement
Claims (1)
管を、マンドレルミルにて圧延する方法において、マン
ドレルバーを移動しつつその表面に潤滑剤を塗布し、塗
布された潤滑剤の膜厚を測定し、測定膜厚と予め定めた
目標膜厚との偏差を求め、これを解消するための潤滑剤
の供給量を求め、該供給量が予め定められている制御可
能範囲内の値であれば供給量を調節し、また制御可能範
囲を越える場合には供給量を制御可能範囲内に保持しつ
つマンドレルバー速度を制御する過程を含むことを特徴
とするマンドレルミル圧延方法。1. In the method of rolling a hollow tube into which a mandrel bar coated with lubricant is inserted, using a mandrel mill, the lubricant is coated on the surface of the tube while moving the mandrel bar, and the film thickness of the applied lubricant is measured. Measure the film thickness, find the deviation between the measured film thickness and the predetermined target film thickness, find the amount of lubricant to be supplied to eliminate this, and if the supply amount is within the predetermined controllable range. 1. A mandrel mill rolling method comprising the steps of: controlling the feed rate, and controlling the mandrel bar speed while maintaining the feed rate within the controllable range if the feed rate exceeds the controllable range.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP519890A JPH03210905A (en) | 1990-01-11 | 1990-01-11 | Rolling method with mandrel mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP519890A JPH03210905A (en) | 1990-01-11 | 1990-01-11 | Rolling method with mandrel mill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03210905A true JPH03210905A (en) | 1991-09-13 |
Family
ID=11604509
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP519890A Pending JPH03210905A (en) | 1990-01-11 | 1990-01-11 | Rolling method with mandrel mill |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03210905A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008081864A1 (en) * | 2006-12-28 | 2008-07-10 | Sumitomo Metal Industries, Ltd. | Method of application of lubricating oil to mandrel bar, method of control of thickness of lubricating oil on mandrel bar, and method of production of seamless steel pipe |
| KR101102331B1 (en) * | 2011-08-04 | 2012-01-09 | 주식회사 지현 | Turning type floodgate |
-
1990
- 1990-01-11 JP JP519890A patent/JPH03210905A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008081864A1 (en) * | 2006-12-28 | 2008-07-10 | Sumitomo Metal Industries, Ltd. | Method of application of lubricating oil to mandrel bar, method of control of thickness of lubricating oil on mandrel bar, and method of production of seamless steel pipe |
| JP2008161915A (en) * | 2006-12-28 | 2008-07-17 | Sumitomo Metal Ind Ltd | Method of applying lubricant on mandrel bar, method of controlling film thickness of lubricant on mandrel bar, and method of manufacturing seamless steel tube |
| US7861565B2 (en) | 2006-12-28 | 2011-01-04 | Sumitomo Metal Industries, Ltd. | Method for applying lubricant onto mandrel bar, method for controlling thickness of lubricant film on mandrel bar, and method for manufacturing seamless steel pipe |
| KR101102331B1 (en) * | 2011-08-04 | 2012-01-09 | 주식회사 지현 | Turning type floodgate |
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