WO2013129237A1 - ガイドロール及びその製造方法 - Google Patents
ガイドロール及びその製造方法 Download PDFInfo
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- WO2013129237A1 WO2013129237A1 PCT/JP2013/054385 JP2013054385W WO2013129237A1 WO 2013129237 A1 WO2013129237 A1 WO 2013129237A1 JP 2013054385 W JP2013054385 W JP 2013054385W WO 2013129237 A1 WO2013129237 A1 WO 2013129237A1
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- WIPO (PCT)
- Prior art keywords
- roll
- roughness
- guide roll
- roll body
- average value
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/02—Shape or construction of rolls
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C13/00—Rolls, drums, discs, or the like; Bearings or mountings therefor
- F16C13/006—Guiding rollers, wheels or the like, formed by or on the outer element of a single bearing or bearing unit, e.g. two adjacent bearings, whose ratio of length to diameter is generally less than one
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B28/00—Maintaining rolls or rolling equipment in effective condition
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B39/14—Guiding, positioning or aligning work
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B41/00—Guiding, conveying, or accumulating easily-flexible work, e.g. wire, sheet metal bands, in loops or curves; Loop lifters
- B21B41/08—Guiding, conveying, or accumulating easily-flexible work, e.g. wire, sheet metal bands, in loops or curves; Loop lifters without overall change in the general direction of movement of the work
- B21B41/10—Loop deflectors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
- F16C2240/40—Linear dimensions, e.g. length, radius, thickness, gap
- F16C2240/54—Surface roughness
Definitions
- the present invention relates to a guide roll used for, for example, a rolling mill and a manufacturing method thereof.
- annealed metal strips are used to prevent surface defects such as hip folds and stretcher strain during secondary processing, improve mechanical properties such as elimination of yield point elongation, shape improvement and surface flattening, and applications
- Temper rolling is performed by a rolling mill 80 shown in FIG.
- the rolling mill 80 is disposed so as to sandwich a pair of work rolls 82 and 83 facing each other with a gap on both sides in the thickness direction of the metal strip 81 to be temper rolled.
- backup rolls 84 and 85 The transport direction of the metal strip 81 rewound by the payoff reel 86 is switched by an entrance deflector roll (guide roll) 87 and is fed between the work rolls 82 and 83.
- the metal strip 81 rolled by the work rolls 82, 83 is wound around the tension reel 89 after the conveying direction is switched again by the output deflector roll (guide roll) 88.
- the outlet side deflector roll 88 When the outlet side deflector roll 88 is worn out by using the rolling mill 80, it is necessary to replace it with a new deflector roll. Conventionally, the use of this new deflector roll may cause fine scratches on the surface of the metal strip 81. Specifically, at the time of acceleration / deceleration of the metal strip 81, a mismatch between the plate passing speed and the peripheral speed of the outlet deflector roll 88 occurs, so that the metal strip 81 is hardened by the outlet deflector roll 88 which is harder than the metal strip 81. It is thought that the surface of the surface is scraped and scratches are generated.
- the metal strip 81 is rubbed against the exit side deflector roll 88, so that the surface of the metal strip 81 is scraped and scratches are generated. Conceivable.
- the exit deflector roll 88 rotates on the metal strip 81, so that the surface of the metal strip 81 is scraped and scratched. It is thought to occur.
- a new deflector roll has been used as an entrance deflector roll 87 for a certain period of time, and after reducing its surface roughness, it has been used as an exit deflector roll 88.
- this method was difficult to handle in an emergency. That is, a long preparation period is required to secure the outlet deflector roll 88, but preparation must be completed in advance when replacement is necessary. Accordingly, it is necessary to prepare for a long period in anticipation of sudden breakage of the outlet deflector roll 88 and to store a certain number of outlet deflector rolls 88.
- Patent Document 1 discloses a technique in which grooves having a depth and width of 0.05 to 10 mm are provided continuously or discontinuously at a pitch of 0.1 to 50 mm in the circumferential direction of the deflector roll. Although disclosed, this technique is intended to improve the controllability of the conveyance speed of the object to be conveyed (steel plate), and does not prevent the occurrence of scratches as described above.
- the present invention has been made in view of the above-described circumstances, and can prevent the generation of minute scratches on the surface of the object to be transported in a new state (unused state), and its use is limited.
- An object of the present invention is to provide a guide roll that can cope with an emergency and a method for manufacturing the same.
- a guide roll according to an aspect of the present invention is a guide roll including a roll body having surface roughness, and includes a roughness curve representing the surface roughness of the roll body and an average line thereof. Among the intersection points, the average value of the distance between the intersection points corresponding to the start point and the end point of the roughness curve is included in the range of 0.2 mm to 1 mm; the maximum valley depth Rv and the maximum height of the roughness curve
- the arithmetic average roughness Ra of the surface of the roll body may be 2.5 ⁇ m or more and 4 ⁇ m or less.
- the guide roll as described in said (1) or (2) may be a deflector roll used for at least one of the entrance side and exit side of a rolling mill.
- a method for manufacturing a guide roll according to an aspect of the present invention is a method for manufacturing a guide roll including a roll body having surface roughness, and the surface of the material of the roll body is roughened.
- a first step of applying; a second step of performing primary polishing on the surface of the material after the roughening; a third step of forming a plating layer on the surface of the material after the primary polishing; and forming the plating layer A fourth step of subjecting the surface of the finished material to final polishing, and finally the roughness curve among the intersections of a roughness curve representing the surface roughness of the roll body and an average line thereof.
- the average value of the distance between the intersections corresponding to the start point and the end point of the mountain is included in the range of 0.2 mm or more and 1 mm or less, and includes the maximum valley depth Rv and the maximum height Ry of the roughness curve (1 )
- the plating layer may be a Cr plating layer.
- the average value of the distance (hereinafter, this distance is referred to as the mountain width) is included in the range of 0.2 mm or more, the shape of the minute mountain existing on the surface of the roll body portion is made gentler than before. it can.
- the average value of the above-mentioned peak width is included in a range of 1 mm or less, it is possible to prevent the conveyance object from slipping on the roll body portion and generating scuffing.
- the arithmetic average roughness Ra of the surface of the roll body is 2.5 ⁇ m or more and 4 ⁇ m or less, it is possible to prevent minute scratches generated on the conveyance object.
- the phenomenon that the conveyance object slides and moves on the surface of the roll body part can be suppressed and further prevented. Can be prevented.
- the average value of the peak width is included in the range of 0.2 mm or more and 1 mm or less by performing the first to fourth steps.
- the roll body having a shape factor K of 0.7 or more can be obtained by a simple method.
- FIG. 1 is a schematic configuration diagram of a guide roll 10 according to an embodiment of the present invention. It is a figure which shows the roughness curve obtained by measuring the surface roughness of the width direction of the roll trunk
- FIG. 4A It is a figure which shows typically the roughness curve (Namely, the surface state of the roll trunk
- the guide roll 10 (conveyance roll) according to this embodiment is a roll used for conveying a plate-shaped conveyance object (for example, a steel material such as a metal strip), and has a fine surface.
- a plate-shaped conveyance object for example, a steel material such as a metal strip
- a roll body 11 having numerous indentations (that is, surface roughness) and a rotating shaft 12.
- This guide roll 10 can be used as at least one of the entrance side deflector roll 87 and the exit side deflector roll 88 of the rolling mill 80 as shown in FIG. 7, for example.
- the roll body 11 is a hollow or solid (filled) cylindrical member, and is fixed to the rotary shaft 12 by connecting means such as welding or bolting in a state where the center axis coincides with the rotary shaft 12.
- a hardened plating layer (for example, a Cr plating layer) is formed on the surface of the roll body 11.
- the rotary shaft 12 is a rod-shaped member having a circular cross section, and both ends thereof are rotatably supported by a rotation support mechanism (not shown). With the roll body 11 in contact with the object to be conveyed, the rotating shaft 12 rotates (that is, the roll body 11 rotates), whereby the object to be conveyed is conveyed in a predetermined conveyance direction.
- FIG. 2A is a diagram showing a roughness curve obtained by measuring the surface roughness of the roll body 11 in the width direction (axial direction).
- FIG. 2B is a diagram schematically illustrating the roughness curve illustrated in FIG. 2A, that is, the surface roughness of the roll body 11.
- a roughness curve is a cross-section obtained by measuring fine irregularities existing on a measurement target surface (the surface of the roll body 11 in this embodiment) using, for example, a stylus type surface roughness measuring instrument. It is a curve obtained by removing a low frequency component (swell component) from a curve.
- the stylus type surface roughness measuring instrument for example, “Surftest SJ301” of “Mitutoyo” or the like can be used.
- the surface of the roll body 11 is equally divided into five measurement sections (for example, a section having a length of 12.5 mm) along the width direction, and each measurement section is measured using a surface roughness measuring instrument.
- the roughness curve of one measurement section is extracted from the roughness curve.
- said measurement conditions are an example, What is necessary is just to set suitably the division
- the number of divisions of the measurement section may be set in the range of 5 to 20, and the length of the measurement section may be set in the range of 10 mm to 15 mm.
- a portion higher than the average line Av in the roughness curve is referred to as a “mountain” (see reference numeral 13 in the figure), and the average line Av in the roughness curve.
- the lower part is called “valley” (see reference numeral 14 in the figure).
- the average line Av is a line that minimizes the sum of squares of the distance (deviation) in the vertical axis direction to the roughness curve.
- the guide roll 10 of the present embodiment has a start point of a roughness curve peak 13 among the intersections of a roughness curve representing the surface roughness of the roll body 11 and its average line Av (see reference numeral P1 in FIG. 2B). And the average value of the distance L between the intersections corresponding to the end point (see P2 in FIG. 2B) (hereinafter, this distance L is called the mountain width L) is included in the range of 0.2 mm to 1 mm. It is a feature.
- the average value of the peak width L calculated individually for each measurement section may be included in the above range. Or the average value of the mountain width L calculated comprehensively about all the measurement sections should just be contained in the said range. Further, the average value of the peak width L may be calculated by excluding the peak width L of protruding values (for example, maximum value and minimum value).
- FIG. 3 the relationship between the average value of the mountain width L of the surface of the roll trunk
- This FIG. 3 uses the guide roll 10 as the exit side deflector roll 88 of the rolling mill 80, and the average value of the peak width L of the roll body 11 is 0.05 mm, 0.1 mm, 0.15 mm, 0.2 mm. It is a figure which shows the relationship between the average value of the mountain width L when it is changed to, and the generation
- FIG. 3 when the average value of the peak width L is less than 0.2 mm, it can be seen that the frequency of occurrence of scratches increases as the average value of the peak width L decreases.
- the reason for this is considered to be that, as shown in FIGS. 4A and 4B, for example, when the average value of the peak width L is less than 0.2 mm, the shape of the peak 13 becomes steep.
- 4A is a diagram showing the roughness curve of the roll body 11 when the average value of the peak width L is less than 0.2 mm
- FIG. 4B is the roughness curve shown in FIG. 4A (that is, the peak width). It is a figure which shows typically the surface state of the roll trunk
- the inventor of the present application obtained an investigation result that when the average value of the peak width L of the roll body portion 11 exceeds 1 mm, a rubbing wrinkle different from a scratched wrinkle occurs in the conveyance object.
- the average value of the peak width L exceeds 1 mm, the unevenness present on the surface of the roll body 11 is reduced, and the contact resistance of the roll body 11 is reduced.
- the conveyance object metal strip
- a rubbing wrinkle different from the scratches is generated in the conveyance object.
- the average value of the mountain width L of the roll body 11 is set within a range of 0.2 mm or more and 1 mm or less based on the above investigation results.
- the guide roll 10 of this embodiment even if it is used as a transport roll (for example, the outlet deflector roll 88) in a new state, scratches are generated on the transport target (for example, a metal strip). It can be prevented from occurring.
- a transport roll for example, the outlet deflector roll 88
- scratches are generated on the transport target (for example, a metal strip). It can be prevented from occurring.
- the lower limit value of the average value of the peak width L is set to 0.3 mm, and the upper limit value of the average value of the peak width L is set to 0.7 mm. Is preferred.
- the pitch of the peaks 13 adjacent in the width direction of the roll body 11 is, for example, about 0.3 to 0.4 mm.
- the maximum valley depth Rv is the maximum distance from the bottom of the valley 14 to the average line Av
- the maximum height Ry is the maximum from the bottom of the valley 14 to the top of the mountain 13.
- the shape factor K calculated individually for each measurement section may be 0.7 or more.
- the shape factor K calculated comprehensively for all measurement sections may be 0.7 or more.
- the inventor of the present application has obtained a survey result that the occurrence of scratches tends to increase when the shape factor K is less than 0.7.
- the reason is considered to be that when the shape factor K is less than 0.7, the Rv value with respect to the Ry value becomes small, and the shape of the peak 13 becomes steep (see FIG. 4B).
- the shape factor K is set to 0.7 or more, but it is preferable to set the shape factor K to 0.75 or more in order to more reliably prevent the occurrence of scratches.
- the upper limit value of the shape factor K is clearly less than 1 from the definition of the above formula (1), but 0.9 or less is preferable in consideration of the effect actually obtained.
- FIG. 5 shows the production of a guide roll 10 in which the average value of the peak width L and the shape factor K are variously changed, and this is used as the exit deflector roll 88 of the rolling mill 80 to cause scratches on the metal strip 81. It is the result of investigating whether or not it occurs.
- the horizontal axis indicates the average value of the peak width L
- the vertical axis indicates the shape factor K.
- the average value of the peak width L is less than 0.2 mm
- scratches were generated even when the shape factor K was set to 0.7 or more.
- the arithmetic average roughness (hereinafter, also simply referred to as average roughness) Ra of the surface of the roll body 11 is 2.5 ⁇ m or more and 4 ⁇ m or less.
- the arithmetic average roughness Ra is defined in “JIS B0601: 2001” (the same applies hereinafter).
- average roughness Ra is less than 2.5 ⁇ m, the frictional resistance with the object to be transported becomes small, and it becomes easy to generate rubbing and the like on the object to be transported.
- average roughness Ra exceeds 4 micrometers, the unevenness
- the guide roll manufacturing method of the present embodiment is a manufacturing method used for manufacturing the above-described guide roll 10 (particularly, the roll body 11), and includes a roughening process (first process) and a primary polishing process (second process). Step), plating step (third step), and finish polishing step (fourth step).
- the surface of the material of the roll body 11 is subjected to surface roughening (so-called dull processing).
- a material hereinafter, referred to as a body material 20
- a material of the roll body 11 whose material and shape (width and diameter) are adjusted according to the specifications of the guide roll 10 to be manufactured is prepared.
- drum material 20 is carbon steel etc., for example.
- the surface of the body material 20 is subjected to shot blasting or electric discharge machining to form irregularities (surface roughness) set to a predetermined roughness on the surface of the body material 20 (FIG. 6). (See “Roughening process”).
- primary polishing is performed on the surface of the body material 20 after the roughening processing.
- the surface of the body material 20 is polished by polishing means such as a grinder, so that the uneven tip (portion corresponding to the tip of the mountain 13) present on the surface of the body material 20 is flattened. (See “Primary polishing step” in FIG. 6).
- a plating layer 21 is formed on the surface of the body material 20 after the primary polishing.
- the hardened plating layer 21 is formed on the uneven surface present on the surface of the body material 20 by performing hardening plating on the surface of the body material 20 using a thermal spraying method or the like (FIG. 6). (See “Plating Process”).
- the hardened plating layer 21 is preferably a Cr plating layer (for example, a thickness of about 10 ⁇ m), but the type of plating may be appropriately changed according to the specifications of the guide roll 10.
- finish polishing is performed on the surface of the body material 20 on which the plating layer 21 is formed.
- the surface of the body material 20 is polished by polishing means such as a grinder, so that the uneven tip (particularly, the uneven tip of the plating layer 21) existing on the surface of the body material 20 is flattened.
- polishing means such as a grinder
- the guide roll 10 demonstrated the case where it was used as at least one of the entrance side deflector roll 87 and the exit side deflector roll 88 of the rolling mill 80, the guide roll 10 of this embodiment is the following. It can be widely used as a transport roll (for example, a bright roll that smoothes the surface of a metal strip) that is likely to cause scratches when transporting a transport object.
- a transport roll for example, a bright roll that smoothes the surface of a metal strip
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Abstract
Description
本願は、2012年03月02日に、日本に出願された特願2012-046758号に基づき優先権を主張し、その内容をここに援用する。
一般に、焼鈍された金属ストリップは、2次加工の際の腰折れやストレッチャーストレイン等の表面欠陥の発生防止、降伏点伸び解消等の機械的性質の改善、形状改善と表面の平坦化、及び用途に適した表面粗度の造込みなどの目的で、図7に示す圧延機80により調質圧延される。この圧延機80は、調質圧延する金属ストリップ81の厚み方向両側に間隔を有して対向配置される一対のワークロール82、83と、このワークロール82、83を挟込むように配置されるバックアップロール84、85とを有している。ペイオフリール86で巻戻された金属ストリップ81は、入側デフレクターロール(ガイドロール)87によってその搬送方向が切替えられて、ワークロール82、83間へ送り込まれる。これらワークロール82、83によって圧延された金属ストリップ81は、出側デフレクターロール(ガイドロール)88によってその搬送方向が再度切替えられて、テンションリール89に巻取られる。
具体的には、金属ストリップ81の加減速時において、通板速度と出側デフレクターロール88の周速との不一致が発生することにより、金属ストリップ81よりも硬い出側デフレクターロール88によって金属ストリップ81の表面が削られてひっかき疵が生じると考えられる。
例えば、出側デフレクターロール88の周速よりも通板速度が速い場合には、金属ストリップ81が出側デフレクターロール88に擦られることにより、金属ストリップ81の表面が削られてひっかき疵が生じると考えられる。また、通板速度よりも出側デフレクターロール88の周速が速い場合には、出側デフレクターロール88が金属ストリップ81の上で回転することにより、金属ストリップ81の表面が削られてひっかき疵が生じると考えられる。
なお、例えば、下記特許文献1には、デフレクターロールの周方向に、0.1~50mmのピッチで、深さ及び幅が0.05~10mmの溝を連続的或いは非連続的に設ける技術が開示されているが、この技術は、搬送対象物(鋼板)の搬送速度の制御性向上を目的としたものであって、上記のようなひっかき疵の発生を防止するものではない。
(1)本発明の一態様に係るガイドロールは、表面粗さが存在するロール胴部を備えるガイドロールであって、前記ロール胴部の表面粗さを表す粗さ曲線とその平均線との交点のうち、前記粗さ曲線の山の始点と終点に相当する交点間の距離の平均値が0.2mm以上1mm以下の範囲に含まれ;前記粗さ曲線の最大谷深さRv及び最大高さRyを含む下記(1)式で定義される形状係数Kが0.7以上である;ことを特徴とする。
K=Rv/Ry …(1)
(4)本発明の一態様に係るガイドロールの製造方法は、表面粗さが存在するロール胴部を備えるガイドロールの製造方法であって、前記ロール胴部の素材表面に粗面化加工を施す第1工程と;前記粗面化加工後の前記素材表面に一次研磨を施す第2工程と;前記一次研磨後の前記素材表面にめっき層を形成する第3工程と;前記めっき層が形成された前記素材表面に仕上げ研磨を施す第4工程と;を有し、最終的に、前記ロール胴部の表面粗さを表す粗さ曲線とその平均線との交点のうち、前記粗さ曲線の山の始点と終点に相当する交点間の距離の平均値が0.2mm以上1mm以下の範囲に含まれると共に、前記粗さ曲線の最大谷深さRv及び最大高さRyを含む下記(1)式で定義される形状係数Kが0.7以上となる前記ロール胴部を得ることを特徴とする。
K=Rv/Ry …(1)
さらに、上記(4)に記載のガイドロールの製造方法によれば、前述の第1工程から第4工程を実施することにより、山幅の平均値が0.2mm以上1mm以下の範囲に含まれると共に、形状係数Kが0.7以上となる前記ロール胴部を簡単な方法で得ることができる。
以下、本発明の一実施形態について図面を参照しながら詳細に説明する。
〔1.ガイドロール〕 まず、本発明に係るガイドロールの一実施形態について説明する。図1に示すように、本実施形態に係るガイドロール10(搬送ロール)は、板状の搬送対象物(例えば金属ストリップ等の鋼材)を搬送するために使用されるロールであり、表面に微細な無数の凸凹(つまり表面粗さ)が存在するロール胴部11と、回転軸12とを備えている。このガイドロール10は、例えば図7に示したような圧延機80の入側デフレクターロール87及び出側デフレクターロール88の少なくとも一方として使用可能である。
本願発明者は、ロール胴部11の表面の山幅Lの平均値と、上記ひっかき疵の発生頻度との関係を鋭意調査した結果、上記のように山幅Lの平均値を0.2mm以上1mm以下の範囲に収めることで、上記ひっかき疵の発生を大幅に低減できることを見出した。
この図3に示すように、ロール胴部11の山幅Lの平均値が0.2mmの場合に、ひっかき疵の発生頻度がゼロとなるので、少なくとも山幅Lの平均値を0.2mm以上とすることで、ひっかき疵の発生を完全に防止できることがわかる。
また、図3に示すように、山幅Lの平均値が0.2mm未満の場合には、山幅Lの平均値が小さくなるにつれて、ひっかき疵の発生頻度が大きくなることがわかる。この理由は、例えば、図4A及び図4Bに示すように、山幅Lの平均値が0.2mm未満の場合には、山13の形状が急峻になるためだと考えられる。なお、図4Aは、山幅Lの平均値が0.2mm未満の場合におけるロール胴部11の粗さ曲線を示す図であり、図4Bは、図4Aに示した粗さ曲線(つまり山幅Lの平均値が0.2mm未満の場合のロール胴部11の表面状態)を模式的に示す図である。
また、本実施形態のガイドロール10は、上述した山幅Lの平均値が0.2mm以上1mm以下の範囲に含まれることに加えて、ロール胴部11の表面粗さを表す粗さ曲線の最大谷深さRv及び最大高さRyを含む下記(1)式で定義される形状係数Kが0.7以上であることが好ましい。
K=Rv/Ry …(1)
ここで、平均粗さRaが2.5μm未満の場合、搬送対象物との摩擦抵抗が小さくなり、搬送対象物に擦り疵等が発生し易くなる。一方、平均粗さRaが4μmを超える場合、ロール胴部11の表面に存在する凹凸が搬送対象物に転写される可能性がある。
従って、より確実に擦り疵や凸凹の転写を防ぐためには、ロール胴部11の表面の算術平均粗さRaの下限値を3μmとし、上限値を3.5μmとすることが好ましい。
次に、本発明に係るガイドロール製造方法の一実施形態について、図6を参照しながら説明する。
本実施形態のガイドロール製造方法は、上述したガイドロール10(特にロール胴部11)の製造に用いられる製造方法であり、粗面化加工工程(第1工程)と、一次研磨工程(第2工程)と、めっき工程(第3工程)と、仕上げ研磨工程(第4工程)との4つの工程を有している。
以上、本発明の一実施形態について説明したが、本発明は上記実施形態に限定されず、本発明の趣旨を逸脱しない範囲において、実施形態の変更が可能である。
例えば、上記実施形態においては、ガイドロール10が、圧延機80の入側デフレクターロール87及び出側デフレクターロール88の少なくとも一方として使用される場合について説明したが、本実施形態のガイドロール10は、搬送対象物の搬送時にひっかき疵の発生が懸念される搬送ロール(例えば金属ストリップの表面を平滑仕上げするブライトロール等)として広く使用することができる。
11 ロール胴部
12 回転軸
13 山
14 谷
Av 平均線
Rv 最大谷深さ
Ry 最大高さ
Claims (5)
-
表面粗さが存在するロール胴部を備えるガイドロールであって、前記ロール胴部の表面粗さを表す粗さ曲線とその平均線との交点のうち、前記粗さ曲線の山の始点と終点に相当する交点間の距離の平均値が0.2mm以上1mm以下の範囲に含まれ;
前記粗さ曲線の最大谷深さRv及び最大高さRyを含む下記(1)式で定義される形状係数Kが0.7以上である;
ことを特徴とするガイドロール。
K=Rv/Ry …(1) -
前記ロール胴部の表面の算術平均粗さRaが2.5μm以上4μm以下であることを特徴とする請求項1に記載のガイドロール。 - 圧延機の入側及び出側の少なくとも一方に使用されるデフレクターロールであることを特徴とする請求項1または2に記載のガイドロール。
-
表面粗さが存在するロール胴部を備えるガイドロールの製造方法であって、
前記ロール胴部の素材表面に粗面化加工を施す第1工程と;
前記粗面化加工後の前記素材表面に一次研磨を施す第2工程と;
前記一次研磨後の前記素材表面にめっき層を形成する第3工程と;
前記めっき層が形成された前記素材表面に仕上げ研磨を施す第4工程と;
を有し、
最終的に、前記ロール胴部の表面粗さを表す粗さ曲線とその平均線との交点のうち、前記粗さ曲線の山の始点と終点に相当する交点間の距離の平均値が0.2mm以上1mm以下の範囲に含まれると共に、前記粗さ曲線の最大谷深さRv及び最大高さRyを含む下記(1)式で定義される形状係数Kが0.7以上となる前記ロール胴部を得ることを特徴とするガイドロールの製造方法。
K=Rv/Ry …(1) - 前記めっき層は、Crめっき層であることを特徴とする請求項4に記載のガイドロールの製造方法。
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JPH0399714A (ja) * | 1989-09-11 | 1991-04-24 | Kawasaki Steel Corp | 金属ストリップ用支持ロール |
JPH04120297A (ja) * | 1990-09-11 | 1992-04-21 | Satosen Co Ltd | ロールの表面処理方法 |
JPH08257616A (ja) * | 1995-03-24 | 1996-10-08 | Nippon Steel Corp | ブライドルロール |
JPH1147815A (ja) * | 1997-07-31 | 1999-02-23 | Sumitomo Metal Ind Ltd | 金属ストリップの搬送用ロール及びその表面加工方法 |
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JP2000033411A (ja) * | 1998-07-21 | 2000-02-02 | Toshiba Corp | 圧延における遺伝係数の測定装置 |
KR20060021971A (ko) * | 2004-09-06 | 2006-03-09 | 주식회사 포스코 | 압연기의 이동식 압연소재 안내장치 |
JP5168823B2 (ja) * | 2006-06-21 | 2013-03-27 | 新日鐵住金株式会社 | 搬送ロールおよび連続焼鈍炉用ハースロール |
KR100961372B1 (ko) * | 2007-12-26 | 2010-06-07 | 주식회사 포스코 | 선재의 압연장치 및 압연방법 |
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JPH0399714A (ja) * | 1989-09-11 | 1991-04-24 | Kawasaki Steel Corp | 金属ストリップ用支持ロール |
JPH04120297A (ja) * | 1990-09-11 | 1992-04-21 | Satosen Co Ltd | ロールの表面処理方法 |
JPH08257616A (ja) * | 1995-03-24 | 1996-10-08 | Nippon Steel Corp | ブライドルロール |
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JP2008156695A (ja) * | 2006-12-22 | 2008-07-10 | Nippon Steel Corp | コンダクターロール |
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CN103402662A (zh) | 2013-11-20 |
CN103402662B (zh) | 2015-07-15 |
JP5435177B1 (ja) | 2014-03-05 |
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