WO2012133484A1 - Method for manufacturing roll for reducing, and roll for reducing - Google Patents

Method for manufacturing roll for reducing, and roll for reducing Download PDF

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Publication number
WO2012133484A1
WO2012133484A1 PCT/JP2012/058058 JP2012058058W WO2012133484A1 WO 2012133484 A1 WO2012133484 A1 WO 2012133484A1 JP 2012058058 W JP2012058058 W JP 2012058058W WO 2012133484 A1 WO2012133484 A1 WO 2012133484A1
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WO
WIPO (PCT)
Prior art keywords
roll
ridge
steel pipe
radius
curvature
Prior art date
Application number
PCT/JP2012/058058
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French (fr)
Japanese (ja)
Inventor
龍太郎 尾形
Original Assignee
住友金属工業株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 住友金属工業株式会社 filed Critical 住友金属工業株式会社
Priority to CN201280013630.1A priority Critical patent/CN103459056B/en
Priority to BR112013023809-7A priority patent/BR112013023809B1/en
Priority to MX2013011178A priority patent/MX338263B/en
Priority to US14/008,587 priority patent/US20140013815A1/en
Priority to EP12765966.2A priority patent/EP2692453B1/en
Publication of WO2012133484A1 publication Critical patent/WO2012133484A1/en

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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
    • B21B27/024—Rolls for bars, rods, rounds, tubes, wire or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B17/00—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling
    • B21B17/14—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling without mandrel, e.g. stretch-reducing mills
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49544—Roller making

Definitions

  • the present invention relates to a method for producing a drawing roll and a drawing roll, and more particularly to a method for producing a drawing roll and a drawing roll used in a three-roll type drawing mill for drawing a steel pipe.
  • a drawing mill typified by a sizer or stretch reducer draws a steel pipe to a predetermined outer diameter.
  • a three-roll type drawing mill is mainly known. Three-roll drawing mills are described in, for example, International Publication No. 2005/070574 and International Publication No. 2005/092531.
  • a drawing mill usually includes a plurality of stands arranged along a pass line.
  • Each stand includes a plurality of drawing rolls having grooves that form a hole mold (caliber).
  • the three rolls of each stand are arranged at equal intervals around the pass line, and are offset by 60 ° around the pass line from the three rolls included in the previous stage stand. .
  • a roll included in each stand of a drawing mill has an elliptical arc-shaped groove in a transverse section (a section in a direction perpendicular to a pass line, that is, a section including a roll axis).
  • a transverse section a section in a direction perpendicular to a pass line, that is, a section including a roll axis.
  • the surface layer portion of the steel pipe being rolled may protrude from the groove of the roll, and so-called biting flaws may occur. Furthermore, if the load acting on the steel pipe portion in contact with the vicinity of the groove edge in the steel pipe to be rolled is increased, edge flaws are likely to occur in the steel pipe portion. Specifically, linear wrinkles are likely to occur in the longitudinal direction of the steel pipe.
  • An object of the present invention is to provide a method for producing a drawing roll that can suppress the occurrence of biting wrinkles and edge wrinkles.
  • a method for producing a drawing roll according to an embodiment of the present invention is used in a three-roll type drawing mill for drawing and rolling a steel pipe, and is adjacent to the caliber part having a bow-shaped groove in a cross section. It is a manufacturing method of the roll for drawing rolling provided with the flange part to perform.
  • the method for producing a drawing roll includes the steps of preparing a drawing roll, rotating the drawing roll around the roll axis, and cutting a ridge formed at an adjacent portion between the caliber portion and the flange portion. And a step of rounding the ridge.
  • the average radius of curvature measured at a pitch of 0.5 mm in the ridge region in the range of 3.0 mm in the roll axis direction around the top of the ridge is 2.5 mm to
  • the difference between the maximum value and the minimum value of the curvature radius is set to 3.0 mm or less.
  • a drawing roll that can suppress the occurrence of biting flaws and edge flaws can be produced.
  • the roll for reduction rolling is used for a three-roll type reduction rolling mill for drawing and rolling a steel pipe.
  • the drawing roll includes a caliber portion having a groove having an arcuate cross section and a flange portion adjacent to the caliber portion.
  • the average curvature radius measured at 0.5 mm pitch is 2.5 mm to 3 mm. 0.0 mm, and the difference between the maximum value and the minimum value of the radius of curvature is 1.0 mm or less.
  • the roll for drawing rolling according to the present embodiment can suppress the occurrence of biting wrinkles and edge wrinkles.
  • FIG. 1 is a side view of a three-roll drawing mill.
  • FIG. 2 is a front view of the stand in FIG.
  • FIG. 3 is a front view of a stand in front of the stand shown in FIG.
  • FIG. 4 is a schematic diagram of steel pipe drawing using the three-roll drawing mill shown in FIG.
  • FIG. 5 is a front view of the drawing roll in FIG.
  • FIG. 6 is an enlarged view of the vicinity of the ridge portion of the drawing roll in FIG.
  • FIG. 7 is a schematic view of a lathe used for manufacturing the drawing roll shown in FIG.
  • FIG. 8 is an enlarged view of the vicinity of a ridge portion of a drawing roll drawn by the lathe shown in FIG. FIG.
  • FIG. 9 is a schematic diagram for explaining a method for measuring the radius of curvature of the ridge shown in FIG.
  • FIG. 10 is a diagram illustrating an example of a method for measuring the curvature radius of the ridge portion illustrated in FIG. 8.
  • FIG. 11 is a cross-sectional view of the room temperature curable resin in FIG.
  • FIG. 12 is a diagram showing measurement results of the shape and curvature radius of the roll used in the example.
  • FIG. 1 is a side view of a drawing mill 1 according to the present embodiment.
  • the drawing mill 1 is a three-roll type.
  • a drawing mill 1 includes a plurality of stands ST1 to STm (m is a natural number) arranged along a pass line RA.
  • the drawing mill 1 is, for example, a stretch reducer, and the number of stands m is about 20-30.
  • FIG. 2 is a front view of the stand STi (i is a natural number of m or less) of the drawing mill 1 shown in FIG. 1, and FIG. 3 is a front view of the stand STi-1.
  • each stand STi includes three drawing rolls (hereinafter simply referred to as rolls) 11.
  • the three rolls 11 are arranged at equal intervals around the pass line RA. Accordingly, the three rolls 11 are arranged around the pass line RA every 120 °.
  • the roll 11 has a groove 20 whose cross section (cross section in the roll axis direction) has an arcuate shape.
  • the grooves 20 of the three rolls 11 form a hole type PA.
  • the three rolls 11 included in the stand STi are arranged so as to be shifted by 60 ° around the pass line RA from the three rolls 11 included in the stand STi-1 in the previous stage.
  • each stand STi The three rolls of each stand STi are connected to each other by a bevel gear (not shown). When one of the three rolls 11 is rotated by a motor (not shown), all the rolls 11 are rotated.
  • the cross-sectional area of the hole-shaped PA formed by the three rolls 11 of each stand STi is smaller as the stand of the latter stage. Therefore, the cross-sectional area of the hole type PA formed by the stand ST1 is the largest, and the cross-sectional area of the hole type PA formed by the last stand STm is the smallest.
  • the steel pipe is drawn and rolled along the pass line RA from the stand ST1 through the stand STm, and becomes a steel pipe having a predetermined outer diameter and thickness.
  • the roll 11 included in the stand STi has a shape shown in FIG. Referring to FIG. 5, the roll 11 includes a caliber portion 50 and a pair of flange portions 51.
  • the caliber portion 50 has a columnar shape, and has a groove 20 having an arcuate shape in cross section on the surface.
  • the flange portion 51 has a disk shape and is arranged coaxially with the caliber portion 50.
  • the flange portion 51 has a truncated cone shape whose width decreases as the distance from the caliber portion 50 increases.
  • the caliber portion 50 and the flange portion 51 are integrally formed.
  • the transverse shape of the groove 20 that is, the shape of the groove 20 in the cross section in the roll axial direction X of the roll 11 is an arcuate shape.
  • the groove 20 is an arc having a radius Ra1.
  • the line segment DB connecting the groove bottom (center of the groove 20 in the roll axis direction) GB and the pass line RA is shorter than the radius Ra1. Therefore, the transverse shape of the groove 20 is an elliptical arc shape with the line segment DB as the short semi-axis. Since the transverse shape of the groove 20 is an elliptical arc, the rolling reduction per stand can be increased to some extent.
  • FIG. 6 is an enlarged view of the vicinity of the ridge 52 shown in FIG. With reference to FIG. 6, the ridge 52 extends in the circumferential direction of the roll 11. The ridge portion 52 is rounded.
  • the above-mentioned drawing mill 1 manufactures a thin steel pipe by drawing rolling.
  • the thickness of the thin steel pipe is, for example, 2.0 to 3.0 mm, and the outer diameter is, for example, 30.0 to 100.0 mm.
  • biting wrinkles and edge wrinkles are likely to occur.
  • the edge wrinkle here means a linear wrinkle formed along the longitudinal direction on the surface of the steel pipe as a result of the surface layer portion of the steel pipe being removed by the ridges of the roll.
  • a thin steel pipe is likely to cause bites and edge wrinkles because the wall thickness is thin, so that the portion of the steel pipe that is rolling is in contact with the portion near the edge of the groove 20 (hereinafter referred to as the metal portion) in the roll axis direction. It is presumed that it is easy to flow into X.
  • the manufacturing method of the roll 11 is explained in full detail.
  • FIG. 7 is a schematic diagram of a lathe machine 60.
  • a lathe machine 60 includes a bed 601, a headstock 602, a carriage 603, a tailstock 604, and a control device 605.
  • the spindle stock 602 and the tailstock 604 include a chuck (not shown).
  • the roll 11 is rotatably attached to the lathe machine 60 by chucks of the headstock 602 and the tailstock 604.
  • the headstock 602 further includes a motor (not shown).
  • the roll 11 is rotated around the roll axis by the motor.
  • the carriage 603 is disposed on the bed 601.
  • the carriage 603 can be moved in the roll axis direction by a motor (not shown).
  • the carriage 603 includes a cutting tool 606.
  • the cutting tool 606 can be moved in a direction perpendicular to the roll axis (the radial direction of the roll 11) by a servo motor (not shown).
  • the control device 605 controls the rotation speed of the roll 11.
  • the control device 605 further controls movement of the carriage 603 in the roll axis direction and movement of the cutting tool 606 in the radial direction of the roll 11.
  • the control device 605 may include a storage device that stores shape data of the grooves 20 and the ridges 52. In this case, the control device 605 controls the movement of the carriage 603 and the cutting tool 606 based on the shape data.
  • the groove 20 is formed by a lathe.
  • the ridge 52 is cut. Specifically, instead of the cutting tool 606, an R cutting tool 607 having a concave cutting edge and a predetermined curvature is attached to the carriage 603. While rotating the roll 11, the R cutting tool 607 is brought into contact with the ridge 52, and the ridge 52 is chamfered. At this time, the ridge 52 is cut so that the radius of curvature of the ridge 52 satisfies the following conditions.
  • FIG. 8 shows an enlarged view of the ridge 52.
  • the ridge 52 has a convex shape in the roll radial direction Y and is rounded.
  • the point having the highest height in the Y direction is defined as the summit T52.
  • an area RA52 in the range of 3.0 mm in the X-axis direction with the top T52 as the center is specified.
  • this region is defined as a ridge region RA52.
  • the ridge region RA52 includes a range of 1.5 mm from the top T52 to the left side (cariba portion 50 side) in the drawing and a range of 1.5 mm from the top T52 to the right side (flange portion 51 side).
  • the radius of curvature is obtained at a pitch of 0.5 mm in the roll axis direction X.
  • points P1 to Pn (n is a natural number) on the surface of the ridge region RA52 are specified at a pitch of 0.5 mm in the roll axis direction X.
  • the radius of curvature Rt at the point Pt (t is a natural number smaller than n) is obtained as follows. Two points (point Pt-1 and point Pt + 1) adjacent to the point Pt are specified. Next, a circle CRt passing through the three specified points (point Pt-1, point Pt, and point Pt + 1) is obtained. The calculated radius of the circle CRt is defined as the curvature radius Rt at the point Pt.
  • the radii of curvature R1 to Rn (mm) at the points P1 to Pn satisfy the following expressions (1) and (2).
  • Rmax is the maximum value of the measured radius of curvature
  • Rmin is the minimum value of the measured radius of curvature.
  • the average radius of curvature measured at 0.5 mm pitch in the roll axis direction X in the ridge region RA52 is 2.5 to 3.0 mm, and the maximum and minimum values of the measured radius of curvature are The difference is 1.0 mm or less.
  • the radius of curvature of each of the above points P1 to Pn is measured as follows. After the ridge 52 is cut by the lathe 60, the room temperature curing resin 70 is brought into contact with an arbitrary portion of the ridge 52 and cured as shown in FIG. Next, the surface shape of the cured room temperature curable resin 70 is measured using a three-dimensional shape measuring machine. Specifically, with reference to FIG. 11, the cross-sectional shape of room-temperature-curing resin 70 is measured when it is cut by a plane including the roll axis and extending in the roll radial direction. In the cross section of FIG. 11, the region RA ⁇ b> 72 where the ridge 52 is molded has the same shape as the ridge 52.
  • the shape of the ridge 52 can be obtained by measuring the shape of the region 72. Based on the obtained shape of the ridge 52, the curvature radius Rn is obtained at a pitch of 0.5 mm in the roll axis direction X as described above.
  • the shape may be measured by a measuring method other than the three-dimensional shape measuring machine.
  • the curvature radius Rn is obtained by the method described above. Then, based on the calculated curvature radius Rn, it is determined whether or not the ridge portion 52 satisfies the expressions (1) and (2). When the formula (1) or the formula (2) is not satisfied, the R cutting tool is adjusted and the ridge portion 52 is cut again.
  • the roll 11 manufactured by the above-described manufacturing method is attached to the drawing mill 1 to perform drawing rolling. In this case, the occurrence of bites and edge wrinkles of the thin steel pipe is particularly suppressed.
  • the roll 11 manufactured by the above method is attached to a stand STi having an outer diameter processing degree of 5.7 to 6.3%.
  • the outer diameter processing degree is defined by Expression (3).
  • Degree of outer diameter processing (%) [ ⁇ (Cross sectional area of hole type of stand STi-1) ⁇ (Cross sectional area of hole type of stand STi-1) ⁇ / (Cross sectional area of hole type of stand STi-1)] ⁇ 100 (3) In this case, the occurrence of biting wrinkles and edge wrinkles is effectively suppressed.
  • the drawing roll 11 according to the present embodiment is particularly suitable for manufacturing a thin steel pipe having an outer diameter of 30.0 to 100.0 mm and a wall thickness of 2.0 to 3.0 mm.
  • the roll 11 can suppress the occurrence of biting flaws and edge wrinkles to some extent even when manufacturing a steel pipe other than the above-described outer diameter and wall thickness.
  • the roll 11 is applied to at least one stand STi among the plurality of stands ST1 to STm, the above effect can be obtained to some extent.
  • the roll 11 exhibits a remarkable effect when applied to the stand STi whose outer diameter processing degree defined by the expression (3) is within the above-described range.
  • the transverse shape of the groove 20 is an arc having a radius Ra1.
  • the shape of the groove 20 is not limited to this.
  • the transverse shape of the groove 20 may be an arc having a radius Ra1 at the groove bottom portion and an arc shape having a radius Ra2 (Ra2> Ra1) at the groove edge portion.
  • the groove edge portion may be linear.
  • the cross shape of the groove 20 may be an arcuate shape.
  • the ridge 52 is cut by the lathe machine 60 and the R cutting tool 607, but the ridge 52 may be cut by another known method.
  • the groove 20 and the ridge 52 may be continuously cut by the control device 605 of the lathe machine 60.
  • the operator may adjust the installation position of the R bit 607 and cut the ridge 52.
  • a plurality of rolls having ridges with different shapes were prepared. Then, the occurrence rate of biting wrinkles and edge wrinkles when drawn and rolled using each roll was investigated.
  • the ridge shape was measured for each set (A set to C set) of rolls. Each set had three rolls 11. In each set, an arbitrary one of the ridges 52 of the roll 11 was molded using a room temperature curable resin (Technobit). The radius of curvature of the ridge region RA52 was obtained at a pitch of 0.5 mm by the above-described method using the room temperature curable resin that was molded.
  • FIG. 12 shows the shape and the radius of curvature of the ridges 52 of each set obtained by the above-mentioned die cutting.
  • the “R shape” column in the table shows the ridge shape of A set to C set in a graph.
  • the vertical axis (Y coordinate) of each graph indicates the distance in the radial direction of the roll.
  • the horizontal axis (X coordinate) of the graph indicates the distance in the roll axis direction X.
  • the dotted line in the figure shows the ridge shape when the radius of curvature is 2.5 mm.
  • the solid line in the figure indicates the actual shape of each set of rolls 11.
  • the radius of curvature obtained at a pitch of 0.5 mm in the roll axis direction X of the ridge shape shown in the “R shape” column is shown in a graph.
  • the vertical axis of each graph represents the radius of curvature (mm).
  • the horizontal axis (X coordinate) indicates the coordinate in the roll axis direction X.
  • “T52” on the horizontal axis indicates the position of the top T52 of the ridge 52.
  • T52-1.5 mm indicates a position moved 1.5 mm from the top T52 to the left side (cariba portion side) in the figure, and “T52 + 1.5 mm” is 1 from the top T52 to the right side (flange portion side) in the figure. Indicates the position moved 5 mm. In short, the range between “T52 ⁇ 1.5 mm” and “T52 + 1.5 mm” indicates the ridge region RA52.
  • the set B satisfied Expression (1) and Expression (2).
  • the F1 value of A set exceeded 3.0 mm
  • the F2 value exceeded 1.0 mm. That is, the A set did not satisfy the expressions (1) and (2).
  • the C set had an F1 value exceeding 3.0 mm and an F2 value exceeding 1.0 mm. Therefore, neither C set nor formula (1) and formula (2) was satisfied.
  • the hot steel pipe from the No. 3 stand was visually observed to determine whether or not the steel pipe had bite or edge flaws. Then, the soot generation rate (%) was obtained based on the equation (5).
  • Table 1 shows the survey results.
  • F1 value of the roll of B set satisfy
  • F2 value satisfy
  • the roll of C set did not satisfy the expressions (1) and (2). Therefore, the soot generation rate was high and was 30.0%. Moreover, the roll of A set did not satisfy

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  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Rolls And Other Rotary Bodies (AREA)

Abstract

Provided is a method for manufacturing a roll for reducing, wherein the occurrence of fin flaws and edge flaws can be suppressed. A roll for reducing used in a three-roll reducing mill is prepared. Next, while the roll for reducing is being rotated about a roll axis, a ridge part (52) formed in an adjacent section between a caliber part and a flange part is cut to round the ridge part (52). In the step for rounding the ridge part (52), in a ridge part region (RA52) within a range of 3.0 mm in a roll axis direction with the top of the ridge part (52) as the center, the average of curvature radii measured at 0.5 mm pitch is set to 2.5-3.0 mm, and the difference between the maximum value and the small value of the curvature radii is set to 1.0 mm or less.

Description

絞り圧延用ロールの製造方法、及び、絞り圧延用ロールMethod for producing drawing roll and drawing roll
　この発明は、絞り圧延用ロールの製造方法及び絞り圧延用ロールに関し、さらに詳しくは、鋼管を絞り圧延する３ロール式絞り圧延機に用いられる絞り圧延用ロールの製造方法及び絞り圧延用ロールに関する。 The present invention relates to a method for producing a drawing roll and a drawing roll, and more particularly to a method for producing a drawing roll and a drawing roll used in a three-roll type drawing mill for drawing a steel pipe.
　サイザやストレッチデューサに代表される絞り圧延機は、鋼管を所定の外径寸法に絞り圧延する。絞り圧延機としては、主として、３ロール式絞り圧延機が知られている。３ロール式絞り圧延機は、たとえば、国際公開第２００５／０７０５７４号及び国際公開第２００５／０９２５３１号に記載されている。 A drawing mill typified by a sizer or stretch reducer draws a steel pipe to a predetermined outer diameter. As the drawing mill, a three-roll type drawing mill is mainly known. Three-roll drawing mills are described in, for example, International Publication No. 2005/070574 and International Publication No. 2005/092531.
　絞り圧延機は、通常、パスラインに沿って配列された複数のスタンドを備える。各スタンドは、孔型（カリバ）を形成する溝を有する複数の絞り圧延用ロールを含む。３ロール式絞り圧延機では、各スタンドの３個のロールがパスライン周りに等間隔に配置され、かつ、前段のスタンドに含まれる３個のロールからパスライン周りに６０°ずれて配置される。 A drawing mill usually includes a plurality of stands arranged along a pass line. Each stand includes a plurality of drawing rolls having grooves that form a hole mold (caliber). In the three-roll drawing mill, the three rolls of each stand are arranged at equal intervals around the pass line, and are offset by 60 ° around the pass line from the three rolls included in the previous stage stand. .
　一般的に、絞り圧延機の各スタンドに含まれるロールは、横断面（パスラインと垂直な方向の断面、つまり、ロール軸を含む断面）で楕円弧状の溝を有する。このようなロールを利用することにより、１スタンド当たりの圧下率をある程度大きくすることができる。 Generally, a roll included in each stand of a drawing mill has an elliptical arc-shaped groove in a transverse section (a section in a direction perpendicular to a pass line, that is, a section including a roll axis). By using such a roll, the rolling reduction per stand can be increased to some extent.
　しかしながら、圧延中の鋼管の表層部分がロールの溝からはみ出て、いわゆる噛み出し疵が発生する場合がある。さらに、絞り圧延される鋼管のうち、溝の縁近傍に接触する鋼管部分に作用する負荷が増大すれば、当該鋼管部分にエッジ疵が発生しやすくなる。具体的には、鋼管の長手方向に線状の疵が発生しやすくなる。 However, the surface layer portion of the steel pipe being rolled may protrude from the groove of the roll, and so-called biting flaws may occur. Furthermore, if the load acting on the steel pipe portion in contact with the vicinity of the groove edge in the steel pipe to be rolled is increased, edge flaws are likely to occur in the steel pipe portion. Specifically, linear wrinkles are likely to occur in the longitudinal direction of the steel pipe.
　このような噛み出し疵やエッジ疵を防止する技術が、特開平１１－１９７７１４号公報及び特開平１１－５７８１６号公報に提案されている。 Techniques for preventing such biting and edge wrinkles have been proposed in Japanese Patent Application Laid-Open Nos. 11-197714 and 11-57816.
　これらの公報では、絞り圧延機に利用されるカリバロールにおいて、カリバとフランジとを境とする稜部に丸みを持たせる。そのため、絞り圧延中の鋼管のフランジ側での噛み出しが緩和されると記載されている。 In these gazettes, in the caliber rolls used in the drawing mill, the ridges with the boundary between the caliber and the flange are rounded. Therefore, it is described that biting on the flange side of the steel pipe during drawing rolling is alleviated.
　しかしながら、これらの公報に記載されているように、ロールの稜部に単に丸みを持たせるだけでは、噛み出し疵やエッジ疵の発生は抑制されない。 However, as described in these publications, the occurrence of biting wrinkles and edge wrinkles is not suppressed by simply rounding the ridges of the roll.
　本発明の目的は、噛み出し疵やエッジ疵の発生を抑制できる絞り圧延用ロールの製造方法を提供することである。 An object of the present invention is to provide a method for producing a drawing roll that can suppress the occurrence of biting wrinkles and edge wrinkles.
　本発明の実施の形態による絞り圧延用ロールの製造方法は、鋼管を絞り圧延する３ロール式絞り圧延機に用いられ、横断面で弓状をなす溝を有するカリバ部と、前記カリバ部に隣接するフランジ部とを備える絞り圧延用ロールの製造方法である。絞り圧延用ロールの製造方法は、絞り圧延用ロールを準備する工程と、絞り圧延用ロールをロール軸まわりに回転し、カリバ部とフランジ部との隣接部分に形成される稜部を切削して稜部に丸みをもたせる工程とを備える。稜部に丸みを持たせる工程では、稜部の頂上を中心としたロール軸方向に３．０ｍｍの範囲の稜部領域において、０．５ｍｍピッチで測定された曲率半径の平均を２．５ｍｍ～３．０ｍｍとし、かつ、曲率半径の最大値と最小値との差分を１．０ｍｍ以下にする。 A method for producing a drawing roll according to an embodiment of the present invention is used in a three-roll type drawing mill for drawing and rolling a steel pipe, and is adjacent to the caliber part having a bow-shaped groove in a cross section. It is a manufacturing method of the roll for drawing rolling provided with the flange part to perform. The method for producing a drawing roll includes the steps of preparing a drawing roll, rotating the drawing roll around the roll axis, and cutting a ridge formed at an adjacent portion between the caliber portion and the flange portion. And a step of rounding the ridge. In the step of rounding the ridge, the average radius of curvature measured at a pitch of 0.5 mm in the ridge region in the range of 3.0 mm in the roll axis direction around the top of the ridge is 2.5 mm to The difference between the maximum value and the minimum value of the curvature radius is set to 3.0 mm or less.
　本実施の形態による絞り圧延用ロールの製造方法では、噛み出し疵やエッジ疵の発生を抑制できる絞り圧延用ロールを製造できる。 In the method for producing a drawing roll according to the present embodiment, a drawing roll that can suppress the occurrence of biting flaws and edge flaws can be produced.
　本実施の形態による絞り圧延用ロールは、鋼管を絞り圧延する３ロール式絞り圧延機に用いられる。絞り圧延用ロールは、横断面で弓状をなす溝を有するカリバ部と、カリバ部に隣接するフランジ部とを備える。カリバ部とフランジ部との隣接部分に形成される稜部の頂上を中心としたロール軸方向に３．０ｍｍの範囲において、０．５ｍｍピッチで測定された曲率半径の平均は２．５ｍｍ～３．０ｍｍであり、かつ、曲率半径の最大値と最小値との差分は１．０ｍｍ以下である。 The roll for reduction rolling according to the present embodiment is used for a three-roll type reduction rolling mill for drawing and rolling a steel pipe. The drawing roll includes a caliber portion having a groove having an arcuate cross section and a flange portion adjacent to the caliber portion. In the range of 3.0 mm in the roll axis direction centered on the top of the ridge formed in the adjacent portion of the caliber portion and the flange portion, the average curvature radius measured at 0.5 mm pitch is 2.5 mm to 3 mm. 0.0 mm, and the difference between the maximum value and the minimum value of the radius of curvature is 1.0 mm or less.
　本実施の形態による絞り圧延用ロールは、噛み出し疵やエッジ疵の発生を抑制できる。 The roll for drawing rolling according to the present embodiment can suppress the occurrence of biting wrinkles and edge wrinkles.
図１は、３ロール式絞り圧延機の側面図である。FIG. 1 is a side view of a three-roll drawing mill. 図２は、図１中のスタンドの正面図である。FIG. 2 is a front view of the stand in FIG. 図３は、図２に示すスタンドの前段のスタンドの正面図である。FIG. 3 is a front view of a stand in front of the stand shown in FIG. 図４は、図１に示す３ロール式絞り圧延機を用いた鋼管の絞り圧延の模式図である。FIG. 4 is a schematic diagram of steel pipe drawing using the three-roll drawing mill shown in FIG. 図５は、図１中の絞り圧延用ロールの正面図である。FIG. 5 is a front view of the drawing roll in FIG. 図６は、図５中の絞り圧延用ロールの稜部近傍の拡大図である。FIG. 6 is an enlarged view of the vicinity of the ridge portion of the drawing roll in FIG. 図７は、図５に示す絞り圧延用ロールの製造に利用される旋盤機の模式図である。FIG. 7 is a schematic view of a lathe used for manufacturing the drawing roll shown in FIG. 図８は、図７に示す旋盤機により切削される絞り圧延用ロールの稜部近傍の拡大図である。FIG. 8 is an enlarged view of the vicinity of a ridge portion of a drawing roll drawn by the lathe shown in FIG. 図９は、図８に示す稜部の曲率半径の測定方法を説明するための模式図である。FIG. 9 is a schematic diagram for explaining a method for measuring the radius of curvature of the ridge shown in FIG. 図１０は、図８に示す稜部の曲率半径の測定方法の一例を示す図である。FIG. 10 is a diagram illustrating an example of a method for measuring the curvature radius of the ridge portion illustrated in FIG. 8. 図１１は、図１０中の常温硬化樹脂の断面図である。FIG. 11 is a cross-sectional view of the room temperature curable resin in FIG. 図１２は、実施例で用いられるロールの形状及び曲率半径の測定結果を示す図である。FIG. 12 is a diagram showing measurement results of the shape and curvature radius of the roll used in the example.
　以下、本発明の実施の形態について図面を用いて詳しく説明する。図中同一又は相当する部分には、同一符号を付してその説明を省略する。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the figure, the same or corresponding parts are denoted by the same reference numerals and description thereof is omitted.
　［絞り圧延機の構成］
　図１は、本実施の形態による絞り圧延機１の側面図である。絞り圧延機１は、３ロール式である。図１を参照して、絞り圧延機１は、パスラインＲＡに沿って配列された複数のスタンドＳＴ１～ＳＴｍ（ｍは自然数）を備える。絞り圧延機１はたとえば、ストレッチレデューサであり、スタンド数ｍは２０～３０程度である。 [Configuration of drawing mill]
FIG. 1 is a side view of a drawing mill 1 according to the present embodiment. The drawing mill 1 is a three-roll type. Referring to FIG. 1, a drawing mill 1 includes a plurality of stands ST1 to STm (m is a natural number) arranged along a pass line RA. The drawing mill 1 is, for example, a stretch reducer, and the number of stands m is about 20-30.
　図２は、図１に示す絞り圧延機１のスタンドＳＴｉ（ｉはｍ以下の自然数）の正面図であり、図３は、スタンドＳＴｉ－１の正面図である。 FIG. 2 is a front view of the stand STi (i is a natural number of m or less) of the drawing mill 1 shown in FIG. 1, and FIG. 3 is a front view of the stand STi-1.
　図２を参照して、各スタンドＳＴｉは、３個の絞り圧延用ロール（以下、単にロールという）１１を含む。３個のロール１１は、パスラインＲＡ周りに互いに等間隔に配置される。したがって、３個のロール１１は、パスラインＲＡ周りに１２０°おきに配置される。ロール１１は、横断面（ロール軸方向の断面）が弓状をなす溝２０を有する。３つのロール１１の溝２０は、孔型ＰＡを形成する。 Referring to FIG. 2, each stand STi includes three drawing rolls (hereinafter simply referred to as rolls) 11. The three rolls 11 are arranged at equal intervals around the pass line RA. Accordingly, the three rolls 11 are arranged around the pass line RA every 120 °. The roll 11 has a groove 20 whose cross section (cross section in the roll axis direction) has an arcuate shape. The grooves 20 of the three rolls 11 form a hole type PA.
　図２及び図３に示すとおり、スタンドＳＴｉに含まれる３個のロール１１は、前段のスタンドＳＴｉ-１に含まれる３個のロール１１からパスラインＲＡ周りに６０°ずれて配置される。 2 and 3, the three rolls 11 included in the stand STi are arranged so as to be shifted by 60 ° around the pass line RA from the three rolls 11 included in the stand STi-1 in the previous stage.
　各スタンドＳＴｉの３個のロールは、図示しないベベルギアにより互いに接続される。３個のロール１１のうちの１つが、図示しないモータで回転することにより、全てのロール１１が回転する。 The three rolls of each stand STi are connected to each other by a bevel gear (not shown). When one of the three rolls 11 is rotated by a motor (not shown), all the rolls 11 are rotated.
　各スタンドＳＴｉの３個のロール１１により形成される孔型ＰＡの断面積は、後段のスタンドのものほど小さくなる。したがって、スタンドＳＴ１で形成される孔型ＰＡの断面積が最も大きく、最後尾のスタンドＳＴｍで形成される孔型ＰＡの断面積が最も小さい。図４に示すとおり、鋼管は、パスラインＲＡに沿ってスタンドＳＴ１からスタンドＳＴｍを通って絞り圧延され、所定の外径及び肉厚を有する鋼管となる。 The cross-sectional area of the hole-shaped PA formed by the three rolls 11 of each stand STi is smaller as the stand of the latter stage. Therefore, the cross-sectional area of the hole type PA formed by the stand ST1 is the largest, and the cross-sectional area of the hole type PA formed by the last stand STm is the smallest. As shown in FIG. 4, the steel pipe is drawn and rolled along the pass line RA from the stand ST1 through the stand STm, and becomes a steel pipe having a predetermined outer diameter and thickness.
　スタンドＳＴｉに含まれるロール１１は、図５に示す形状を有する。図５を参照して、ロール１１は、カリバ部５０と、一対のフランジ部５１とを備える。カリバ部５０は円柱状であり、横断面で弓状をなす溝２０を表面に有する。フランジ部５１は、円板状であり、カリバ部５０と同軸に配置される。フランジ部５１は、カリバ部５０から離れるにしたがって幅が小さくなる、円錐台状である。カリバ部５０とフランジ部５１とは、一体的に形成される。 The roll 11 included in the stand STi has a shape shown in FIG. Referring to FIG. 5, the roll 11 includes a caliber portion 50 and a pair of flange portions 51. The caliber portion 50 has a columnar shape, and has a groove 20 having an arcuate shape in cross section on the surface. The flange portion 51 has a disk shape and is arranged coaxially with the caliber portion 50. The flange portion 51 has a truncated cone shape whose width decreases as the distance from the caliber portion 50 increases. The caliber portion 50 and the flange portion 51 are integrally formed.
　上述のとおり、溝２０の横断形状、つまり、ロール１１のロール軸方向Ｘの断面における溝２０の形状は弓状である。本例では、溝２０は、半径Ｒａ１の円弧である。溝２０の溝底（溝２０のロール軸方向の中央）ＧＢとパスラインＲＡとを結ぶ線分ＤＢは、半径Ｒａ１よりも短い。したがって、溝２０の横断形状は、線分ＤＢを短半軸とする楕円弧状である。溝２０の横断形状が楕円弧状であるため、１スタンド当たりの圧下率をある程度大きくすることができる。 As described above, the transverse shape of the groove 20, that is, the shape of the groove 20 in the cross section in the roll axial direction X of the roll 11 is an arcuate shape. In this example, the groove 20 is an arc having a radius Ra1. The line segment DB connecting the groove bottom (center of the groove 20 in the roll axis direction) GB and the pass line RA is shorter than the radius Ra1. Therefore, the transverse shape of the groove 20 is an elliptical arc shape with the line segment DB as the short semi-axis. Since the transverse shape of the groove 20 is an elliptical arc, the rolling reduction per stand can be increased to some extent.
　カリバ部５０とフランジ部５１との隣接部分には、稜部５２が形成される。図６は、図５に示す稜部５２近傍部分の拡大図である。図６を参照して、稜部５２は、ロール１１の円周方向に延びる。そして、稜部５２は丸みを帯びている。 A ridge 52 is formed in an adjacent portion between the caliber portion 50 and the flange portion 51. FIG. 6 is an enlarged view of the vicinity of the ridge 52 shown in FIG. With reference to FIG. 6, the ridge 52 extends in the circumferential direction of the roll 11. The ridge portion 52 is rounded.
　上述の絞り圧延機１は、絞り圧延により薄肉の鋼管を製造する。薄肉の鋼管の肉厚はたとえば、２．０～３．０ｍｍであり、外径はたとえば、３０．０～１００．０ｍｍである。このような薄肉の鋼管を製造する場合、噛み出し疵やエッジ疵が発生しやすい。ここでいうエッジ疵とは、鋼管の表層部分がロールの稜部によりえぐられ、その結果、鋼管の表面に長手方向に沿って形成される線状の疵を意味する。薄肉の鋼管で噛み出し疵やエッジ疵が発生しやすいのは、肉厚が薄いため、圧延中の鋼管のうち溝２０の縁近傍部分に接触する部分（以下、メタル部分という）がロール軸方向Ｘに流動しやすいためと推定される。 The above-mentioned drawing mill 1 manufactures a thin steel pipe by drawing rolling. The thickness of the thin steel pipe is, for example, 2.0 to 3.0 mm, and the outer diameter is, for example, 30.0 to 100.0 mm. When such a thin steel pipe is manufactured, biting wrinkles and edge wrinkles are likely to occur. The edge wrinkle here means a linear wrinkle formed along the longitudinal direction on the surface of the steel pipe as a result of the surface layer portion of the steel pipe being removed by the ridges of the roll. A thin steel pipe is likely to cause bites and edge wrinkles because the wall thickness is thin, so that the portion of the steel pipe that is rolling is in contact with the portion near the edge of the groove 20 (hereinafter referred to as the metal portion) in the roll axis direction. It is presumed that it is easy to flow into X.
　以下の製造方法に基づいてロール１１を製造することにより、特に薄肉の鋼管を製造する場合に噛み出し疵やエッジ疵の発生が抑制される。以下、ロール１１の製造方法について詳述する。 By producing the roll 11 based on the following production method, the occurrence of biting and edge wrinkles is suppressed particularly when a thin steel pipe is produced. Hereinafter, the manufacturing method of the roll 11 is explained in full detail.
　［製造方法］
　ロール１１は、周知の方法で作製する。具体的には、準備されたロール１１を周知の旋盤機に配置する。図７は、旋盤機６０の模式図である。図７を参照して、旋盤機６０は、ベッド６０１と、主軸台６０２と、往復台６０３と、心押台６０４と、制御装置６０５とを備える。 [Production method]
The roll 11 is produced by a known method. Specifically, the prepared roll 11 is placed on a known lathe machine. FIG. 7 is a schematic diagram of a lathe machine 60. Referring to FIG. 7, a lathe machine 60 includes a bed 601, a headstock 602, a carriage 603, a tailstock 604, and a control device 605.
　主軸台６０２及び心押台６０４は、図示しないチャックを備える。主軸台６０２及び心押台６０４のチャックにより、ロール１１が旋盤機６０に回転可能に取り付けられる。 The spindle stock 602 and the tailstock 604 include a chuck (not shown). The roll 11 is rotatably attached to the lathe machine 60 by chucks of the headstock 602 and the tailstock 604.
　主軸台６０２はさらに、図示しないモータを備える。モータにより、ロール１１がロール軸回りを回転する。 The headstock 602 further includes a motor (not shown). The roll 11 is rotated around the roll axis by the motor.
　往復台６０３は、ベッド６０１上に配置される。往復台６０３は、図示しないモータにより、ロール軸方向に移動できる。往復台６０３はバイト６０６を備える。バイト６０６は、図示しないサーボモータにより、ロール軸と垂直な方向（ロール１１の径方向）に移動できる。 The carriage 603 is disposed on the bed 601. The carriage 603 can be moved in the roll axis direction by a motor (not shown). The carriage 603 includes a cutting tool 606. The cutting tool 606 can be moved in a direction perpendicular to the roll axis (the radial direction of the roll 11) by a servo motor (not shown).
　制御装置６０５は、ロール１１の回転速度を制御する。制御装置６０５はさらに、往復台６０３のロール軸方向への移動と、バイト６０６のロール１１の径方向への移動とを制御する。制御装置６０５は、溝２０及び稜部５２の形状データを記憶する記憶装置を備えてもよい。この場合、制御装置６０５は、形状データに基づいて、往復台６０３及びバイト６０６の移動を制御する。 The control device 605 controls the rotation speed of the roll 11. The control device 605 further controls movement of the carriage 603 in the roll axis direction and movement of the cutting tool 606 in the radial direction of the roll 11. The control device 605 may include a storage device that stores shape data of the grooves 20 and the ridges 52. In this case, the control device 605 controls the movement of the carriage 603 and the cutting tool 606 based on the shape data.
　ロール１１を旋盤機６０に取り付けた後、旋盤により溝２０を形成する。 After attaching the roll 11 to the lathe machine 60, the groove 20 is formed by a lathe.
　次に、稜部５２を切削する。具体的には、バイト６０６に変えて、刃先が凹状であり、所定の曲率を有するＲバイト６０７を往復台６０３に取り付ける。ロール１１を回転しながら、Ｒバイト６０７を稜部５２に接触させ、稜部５２をＲ面取りする。このとき、稜部５２の曲率半径が、以下の条件を満たすように、稜部５２を切削する。 Next, the ridge 52 is cut. Specifically, instead of the cutting tool 606, an R cutting tool 607 having a concave cutting edge and a predetermined curvature is attached to the carriage 603. While rotating the roll 11, the R cutting tool 607 is brought into contact with the ridge 52, and the ridge 52 is chamfered. At this time, the ridge 52 is cut so that the radius of curvature of the ridge 52 satisfies the following conditions.
　図８に稜部５２の拡大図を示す。図８を参照して、稜部５２は、ロール径方向Ｙに凸の形状を有し、丸みを帯びている。 FIG. 8 shows an enlarged view of the ridge 52. Referring to FIG. 8, the ridge 52 has a convex shape in the roll radial direction Y and is rounded.
　稜部５２のうち、Ｙ方向への高さが最も高い地点を頂上Ｔ５２と定義する。稜部５２のうち、頂上Ｔ５２を中心とした、Ｘ軸方向に３．０ｍｍの範囲の領域ＲＡ５２を特定する。以下、この領域を稜部領域ＲＡ５２と定義する。稜部領域ＲＡ５２は、頂上Ｔ５２から図中左側（カリバ部５０側）に１．５ｍｍの範囲と、頂上Ｔ５２から右側（フランジ部５１側）に１．５ｍｍの範囲とを含む。 Of the ridges 52, the point having the highest height in the Y direction is defined as the summit T52. Among the ridges 52, an area RA52 in the range of 3.0 mm in the X-axis direction with the top T52 as the center is specified. Hereinafter, this region is defined as a ridge region RA52. The ridge region RA52 includes a range of 1.5 mm from the top T52 to the left side (cariba portion 50 side) in the drawing and a range of 1.5 mm from the top T52 to the right side (flange portion 51 side).
　特定された稜部領域ＲＡ５２において、ロール軸方向Ｘに０．５ｍｍピッチで、曲率半径を求める。具体的には、図９に示すように、ロール軸方向Ｘに０．５ｍｍピッチで、稜部領域ＲＡ５２の表面上の点Ｐ１～Ｐｎ（ｎは自然数）を特定する。 In the specified ridge region RA52, the radius of curvature is obtained at a pitch of 0.5 mm in the roll axis direction X. Specifically, as shown in FIG. 9, points P1 to Pn (n is a natural number) on the surface of the ridge region RA52 are specified at a pitch of 0.5 mm in the roll axis direction X.
　点Ｐｔ（ｔはｎよりも小さい自然数）での曲率半径Ｒｔを以下のとおり求める。点Ｐｔと隣り合う２点（点Ｐｔ－１及び点Ｐｔ＋１）を特定する。次に、特定された３点（点Ｐｔ－１、点Ｐｔ及び点Ｐｔ＋１）を通る円ＣＲｔを求める。求めた円ＣＲｔの半径を、点Ｐｔでの曲率半径Ｒｔと定義する。 The radius of curvature Rt at the point Pt (t is a natural number smaller than n) is obtained as follows. Two points (point Pt-1 and point Pt + 1) adjacent to the point Pt are specified. Next, a circle CRt passing through the three specified points (point Pt-1, point Pt, and point Pt + 1) is obtained. The calculated radius of the circle CRt is defined as the curvature radius Rt at the point Pt.
　稜部領域ＲＡ５２において、各点Ｐ１～Ｐｎでの曲率半径Ｒ１～Ｒｎ（ｍｍ）は、以下の式（１）及び式（２）を満たす。
　２．５≦（Ｒ１＋Ｒ２＋…＋Ｒｎ）／ｎ≦３．０　（１）
　Ｒｍａｘ－Ｒｍｉｎ≦１．０　（２）
　ここで、Ｒｍａｘは測定された曲率半径の最大値であり、Ｒｍｉｎは測定された曲率半径の最小値である。 In the ridge region RA52, the radii of curvature R1 to Rn (mm) at the points P1 to Pn satisfy the following expressions (1) and (2).
2.5 ≦ (R1 + R2 +... + Rn) /n≦3.0 (1)
Rmax−Rmin ≦ 1.0 (2)
Here, Rmax is the maximum value of the measured radius of curvature, and Rmin is the minimum value of the measured radius of curvature.
　要するに、稜部領域ＲＡ５２でロール軸方向Ｘに０．５ｍｍピッチで測定された曲率半径の平均は、２．５～３．０ｍｍであり、かつ、測定された曲率半径の最大値と最小値との差分は１．０ｍｍ以下である。 In short, the average radius of curvature measured at 0.5 mm pitch in the roll axis direction X in the ridge region RA52 is 2.5 to 3.0 mm, and the maximum and minimum values of the measured radius of curvature are The difference is 1.0 mm or less.
　式（１）及び式（２）を満たすことにより、特に、３０．０～１００．０ｍｍの外径と、２．０～３．０ｍｍの肉厚とを有する薄肉の鋼管を圧延するときに、噛み出し疵やエッジ疵の発生を抑制できる。その理由は定かではないが、以下の理由が推定される。 By satisfying the formulas (1) and (2), particularly when rolling a thin steel pipe having an outer diameter of 30.0 to 100.0 mm and a wall thickness of 2.0 to 3.0 mm, Occurrence of biting and edge wrinkles can be suppressed. The reason is not clear, but the following reason is presumed.
　Ｆ１＝（Ｒ１＋Ｒ２＋…＋Ｒｎ）／ｎと定義した場合、Ｆ１値が３．０ｍｍを超えると、メタル部分は、稜部５２で拘束されず、ロール軸方向Ｘに流動しやすくなる。そのため、噛み出し疵が発生しやすくなる。 When defined as F1 = (R1 + R2 +... + Rn) / n, when the F1 value exceeds 3.0 mm, the metal portion is not restrained by the ridge portion 52 and easily flows in the roll axis direction X. As a result, biting wrinkles are likely to occur.
　一方、Ｆ１値が２．５ｍｍ未満である場合、溝２０の縁近傍に接触するメタル部分は、稜部５２で過剰に拘束される。そのため、メタル部分が稜部５２にえぐられ、エッジ疵が発生しやすくなる。 On the other hand, when the F1 value is less than 2.5 mm, the metal portion that contacts the vicinity of the edge of the groove 20 is excessively restrained by the ridge 52. For this reason, the metal portion is scooped by the ridge 52, and edge wrinkles are likely to occur.
　Ｆ２＝Ｒｍａｘ－Ｒｍｉｎと定義した場合、Ｆ２値が１．０ｍｍを超えると、噛み出し疵及びエッジ疵が発生する。その理由は定かではないが、以下の理由が推定される。薄肉の鋼管を絞り圧延する場合、溝２０の縁近傍に接触するメタル部分の流動は大きい。Ｆ２値が１．０ｍｍを超える場合、稜部５２の表面に微小ではあるが凹凸が存在する。そのため、Ｆ２値が１．０ｍｍ未満の場合と比較して、メタル部分が凹凸により不均一に流動しやすくなる。不均一な流動により、鋼管のメタル部分は不均一に変形し、その結果、噛み出し疵やエッジ疵が発生しやすいと推定される。 When F2 = Rmax−Rmin is defined, if the F2 value exceeds 1.0 mm, biting wrinkles and edge wrinkles occur. The reason is not clear, but the following reason is presumed. When a thin steel pipe is drawn and rolled, the flow of the metal part contacting the vicinity of the edge of the groove 20 is large. When the F2 value exceeds 1.0 mm, the surface of the ridge 52 has minute but unevenness. Therefore, compared to the case where the F2 value is less than 1.0 mm, the metal portion tends to flow unevenly due to the unevenness. Due to the non-uniform flow, the metal portion of the steel pipe is deformed non-uniformly, and as a result, it is presumed that biting and edge wrinkles are likely to occur.
　上述の各点Ｐ１～Ｐｎの曲率半径は、たとえば、以下のように測定する。稜部５２を旋盤機６０により切削した後、図１０に示すとおり、稜部５２の任意の箇所に常温硬化樹脂７０を接触させて硬化させ、稜部５２の形状を型取りする。次に、三次元形状測定機を用いて、硬化した常温硬化樹脂７０の表面形状を測定する。具体的には、図１１を参照して、ロール軸を含みロール径方向に延びる面で切断したときの常温硬化樹脂７０の断面形状を測定する。図１１の断面のうち、稜部５２が型取りされた領域ＲＡ７２は、稜部５２と同じ形状を有する。そのため、領域７２の形状を測定することにより、稜部５２の形状を求めることができる。求められた稜部５２の形状に基づいて、上述のとおり、ロール軸方向Ｘに０．５ｍｍピッチで曲率半径Ｒｎを求める。なお、形状の測定は、３次元形状測定機以外の他の測定方法により測定されてもよい。 For example, the radius of curvature of each of the above points P1 to Pn is measured as follows. After the ridge 52 is cut by the lathe 60, the room temperature curing resin 70 is brought into contact with an arbitrary portion of the ridge 52 and cured as shown in FIG. Next, the surface shape of the cured room temperature curable resin 70 is measured using a three-dimensional shape measuring machine. Specifically, with reference to FIG. 11, the cross-sectional shape of room-temperature-curing resin 70 is measured when it is cut by a plane including the roll axis and extending in the roll radial direction. In the cross section of FIG. 11, the region RA <b> 72 where the ridge 52 is molded has the same shape as the ridge 52. Therefore, the shape of the ridge 52 can be obtained by measuring the shape of the region 72. Based on the obtained shape of the ridge 52, the curvature radius Rn is obtained at a pitch of 0.5 mm in the roll axis direction X as described above. The shape may be measured by a measuring method other than the three-dimensional shape measuring machine.
　旋盤機６０を用いて稜部５２を切削した後、上述の方法により曲率半径Ｒｎを求める。そして、求めた曲率半径Ｒｎに基づいて、稜部５２が式（１）及び式（２）を満たすか否か判断する。式（１）又は式（２）を満たさない場合、Ｒバイトを調整して、再び稜部５２を切削する。 After cutting the ridge 52 using the lathe machine 60, the curvature radius Rn is obtained by the method described above. Then, based on the calculated curvature radius Rn, it is determined whether or not the ridge portion 52 satisfies the expressions (1) and (2). When the formula (1) or the formula (2) is not satisfied, the R cutting tool is adjusted and the ridge portion 52 is cut again.
　以上の工程を必要に応じて繰り返し、式（１）及び式（２）を満たすロール１１を製造する。 The above process is repeated as needed, and the roll 11 which satisfy | fills Formula (1) and Formula (2) is manufactured.
　上述の製造方法により製造されたロール１１を、絞り圧延機１に取り付け、絞り圧延を実施する。この場合、特に薄肉の鋼管の噛み出し疵やエッジ疵の発生が抑制される。 The roll 11 manufactured by the above-described manufacturing method is attached to the drawing mill 1 to perform drawing rolling. In this case, the occurrence of bites and edge wrinkles of the thin steel pipe is particularly suppressed.
　好ましくは、上記方法により製造されたロール１１は、外径加工度が５．７～６．３％のスタンドＳＴｉに取り付ける。ここでいう外径加工度とは、式（３）で定義される。
　外径加工度（％）＝［｛（スタンドＳＴｉ－１の孔型の断面積）－（スタンドＳＴｉの孔型の断面積）｝／（スタンドＳＴｉ－１の孔型の断面積）］×１００　（３）
　この場合、噛み出し疵及びエッジ疵の発生が、有効に抑制される。 Preferably, the roll 11 manufactured by the above method is attached to a stand STi having an outer diameter processing degree of 5.7 to 6.3%. Here, the outer diameter processing degree is defined by Expression (3).
Degree of outer diameter processing (%) = [{(Cross sectional area of hole type of stand STi-1) − (Cross sectional area of hole type of stand STi-1)} / (Cross sectional area of hole type of stand STi-1)] × 100 (3)
In this case, the occurrence of biting wrinkles and edge wrinkles is effectively suppressed.
　本実施の形態による絞り圧延用ロール１１は、特に、３０．０～１００．０ｍｍの外径と、２．０～３．０ｍｍの肉厚とを有する薄肉の鋼管を製造する場合に適する。しかしながら、ロール１１は、上述の外径寸法及び肉厚寸法以外の鋼管を製造する場合であっても、噛み出し疵及びエッジ疵の発生をある程度抑制できる。 The drawing roll 11 according to the present embodiment is particularly suitable for manufacturing a thin steel pipe having an outer diameter of 30.0 to 100.0 mm and a wall thickness of 2.0 to 3.0 mm. However, the roll 11 can suppress the occurrence of biting flaws and edge wrinkles to some extent even when manufacturing a steel pipe other than the above-described outer diameter and wall thickness.
　ロール１１は、複数のスタンドＳＴ１～ＳＴｍのうち、少なくとも１つのスタンドＳＴｉに適用されれば、上記効果がある程度得られる。ロール１１は、式（３）で定義される外径加工度が上述の範囲内のスタンドＳＴｉに適用されれば、顕著な効果を発揮する。 If the roll 11 is applied to at least one stand STi among the plurality of stands ST1 to STm, the above effect can be obtained to some extent. The roll 11 exhibits a remarkable effect when applied to the stand STi whose outer diameter processing degree defined by the expression (3) is within the above-described range.
　上述の実施の形態では、溝２０の横断形状は、半径Ｒａ１の円弧である。しかしながら、溝２０の形状は、これに限定されない。たとえば、溝２０の横断形状は、溝底部分で半径Ｒａ１の円弧であり、かつ、溝縁部分で半径Ｒａ２（Ｒａ２＞Ｒａ１）の弓状であってもよい。また、溝縁部分が直線状であってもよい。溝２０の横断形状は、弓状であれば足りる。 In the above-described embodiment, the transverse shape of the groove 20 is an arc having a radius Ra1. However, the shape of the groove 20 is not limited to this. For example, the transverse shape of the groove 20 may be an arc having a radius Ra1 at the groove bottom portion and an arc shape having a radius Ra2 (Ra2> Ra1) at the groove edge portion. Further, the groove edge portion may be linear. The cross shape of the groove 20 may be an arcuate shape.
　上述の実施の形態では、旋盤機６０及びＲバイト６０７により稜部５２の切削を行ったが、他の周知の方法により稜部５２を切削してもよい。 In the above-described embodiment, the ridge 52 is cut by the lathe machine 60 and the R cutting tool 607, but the ridge 52 may be cut by another known method.
　また、上述の実施の形態では、旋盤機６０の制御装置６０５により、溝２０及び稜部５２の切削を連続的に実施してもよい。 Further, in the above-described embodiment, the groove 20 and the ridge 52 may be continuously cut by the control device 605 of the lathe machine 60.
　さらに、制御装置６０５を利用せずに、作業者がＲバイト６０７の設置位置を調整し、稜部５２を切削してもよい。 Furthermore, without using the control device 605, the operator may adjust the installation position of the R bit 607 and cut the ridge 52.
　異なる形状の稜部を有する複数のロールを準備した。そして、各ロールを利用して絞り圧延したときの噛み出し疵及びエッジ疵の発生率を調査した。 A plurality of rolls having ridges with different shapes were prepared. Then, the occurrence rate of biting wrinkles and edge wrinkles when drawn and rolled using each roll was investigated.
　［調査方法］
　２６個のスタンドを備えるストレッチレデューサ（３ロール式）を用いた。また、図１２に示すＡセット～Ｃセットのロールを準備した。 [Investigation method]
A stretch reducer (3 roll type) having 26 stands was used. Also, rolls of A set to C set shown in FIG. 12 were prepared.
　各セット（Ａセット～Ｃセット）のロールに対して、稜部形状を測定した。各セットは、３個のロール１１を有した。各セットにおいて、ロール１１の稜部５２の任意の１箇所を常温硬化樹脂（テクノビット）を用いて型取りした。型取りされた常温硬化樹脂を利用して、上述の方法により、稜部領域ＲＡ５２の曲率半径を０．５ｍｍピッチで求めた。 The ridge shape was measured for each set (A set to C set) of rolls. Each set had three rolls 11. In each set, an arbitrary one of the ridges 52 of the roll 11 was molded using a room temperature curable resin (Technobit). The radius of curvature of the ridge region RA52 was obtained at a pitch of 0.5 mm by the above-described method using the room temperature curable resin that was molded.
　図１２は、上記型取りにより得られた、各セットの稜部５２の形状及び曲率半径を示す。図１２を参照して、表中の「Ｒ形状」欄には、Ａセット～Ｃセットの稜部形状をグラフで示す。各グラフの縦軸（Ｙ座標）は、ロールの径方向の距離を示す。グラフの横軸（Ｘ座標）は、ロール軸方向Ｘの距離を示す。図中の点線は、曲率半径が２．５ｍｍの場合の稜部形状を示す。図中の実線は、各セットのロール１１の実際の形状を示す。 FIG. 12 shows the shape and the radius of curvature of the ridges 52 of each set obtained by the above-mentioned die cutting. Referring to FIG. 12, the “R shape” column in the table shows the ridge shape of A set to C set in a graph. The vertical axis (Y coordinate) of each graph indicates the distance in the radial direction of the roll. The horizontal axis (X coordinate) of the graph indicates the distance in the roll axis direction X. The dotted line in the figure shows the ridge shape when the radius of curvature is 2.5 mm. The solid line in the figure indicates the actual shape of each set of rolls 11.
　図１２の表中の「曲率半径」欄には、「Ｒ形状」欄で示された稜部形状のロール軸方向Ｘに０．５ｍｍピッチで求めた曲率半径をグラフで示す。各グラフの縦軸は、曲率半径（ｍｍ）を示す。横軸（Ｘ座標）は、ロール軸方向Ｘの座標を示す。具体的には、横軸の「Ｔ５２」は、稜部５２の頂上Ｔ５２の位置を示す。「Ｔ５２－１．５ｍｍ」は、頂上Ｔ５２から図中左側（カリバ部側）に１．５ｍｍ移動した位置を示し、「Ｔ５２＋１．５ｍｍ」は、頂上Ｔ５２から図中右側（フランジ部側）に１．５ｍｍ移動した位置を示す。要するに、「Ｔ５２－１．５ｍｍ」と「Ｔ５２＋１．５ｍｍ」との間の範囲は、稜部領域ＲＡ５２を示す。 In the “curvature radius” column in the table of FIG. 12, the radius of curvature obtained at a pitch of 0.5 mm in the roll axis direction X of the ridge shape shown in the “R shape” column is shown in a graph. The vertical axis of each graph represents the radius of curvature (mm). The horizontal axis (X coordinate) indicates the coordinate in the roll axis direction X. Specifically, “T52” on the horizontal axis indicates the position of the top T52 of the ridge 52. “T52-1.5 mm” indicates a position moved 1.5 mm from the top T52 to the left side (cariba portion side) in the figure, and “T52 + 1.5 mm” is 1 from the top T52 to the right side (flange portion side) in the figure. Indicates the position moved 5 mm. In short, the range between “T52−1.5 mm” and “T52 + 1.5 mm” indicates the ridge region RA52.
　各セットにおいて、測定された曲率半径に基づいて、Ｆ１値及びＦ２値を求めた。求めた結果を表１に示す。 In each set, F1 value and F2 value were obtained based on the measured radius of curvature. Table 1 shows the obtained results.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
　表１を参照して、Ｂセットは、式（１）及び式（２）を満たした。一方、ＡセットのＦ１値は、３．０ｍｍを超え、Ｆ２値が１．０ｍｍを超えた。つまり、Ａセットは式（１）及び式（２）を満たさなかった。Ｃセットは、Ｆ１値が３．０ｍｍを超え、かつ、Ｆ２値が１．０ｍｍを超えた。したがって、Ｃセットも式（１）及び式（２）のいずれも満たさなかった。 Referring to Table 1, the set B satisfied Expression (1) and Expression (2). On the other hand, the F1 value of A set exceeded 3.0 mm, and the F2 value exceeded 1.0 mm. That is, the A set did not satisfy the expressions (1) and (2). The C set had an F1 value exceeding 3.0 mm and an F2 value exceeding 1.0 mm. Therefore, neither C set nor formula (1) and formula (2) was satisfied.
　Ａセットのロールを３番スタンドに取り付けた。そして、Ａセットのロールを取り付けたストレッチレデューサを利用して、ＪＩＳ規格のＸＳＴＣに相当する材質の鋼管２０本を熱間で絞り圧延して、外径３１．８ｍｍ、肉厚２．５ｍｍの薄肉の鋼管を製造した。このとき、絞り圧延全体での外径加工度は、７１％であった。
　ここでいう、絞り圧延全体での外径加工度は、以下の式（４）で求めた。
　全体での外径加工度（％）＝［｛（絞り圧延前の鋼管の外径）－（絞り圧延後の鋼管の外径）｝／（絞り圧延前の鋼管の外径）］×１００　（４） A set of rolls was attached to No. 3 stand. Then, using a stretch reducer with an A set roll attached, 20 steel pipes made of a material corresponding to JIS standard XSTC are hot drawn and rolled to a thin wall having an outer diameter of 31.8 mm and a wall thickness of 2.5 mm. The steel pipe was manufactured. At this time, the outer diameter processing degree in the whole drawing rolling was 71%.
The outside diameter working degree in the whole drawing rolling here was calculated | required by the following formula | equation (4).
Overall outer diameter processing ratio (%) = [{(outer diameter of steel pipe before drawing) − (outer diameter of steel pipe after drawing)} / (outer diameter of steel pipe before drawing)] × 100 ( 4)
　圧延中、３番スタンドから出た熱間の鋼管を目視観察し、鋼管に噛み出し疵又はエッジ疵が発生しているか否かを判断した。そして、式（５）に基づいて、疵発生率（％）を求めた。
　疵発生率（％）＝（噛み出し疵又はエッジ疵が確認された鋼管本数／絞り圧延した鋼管の総本数）×１００　（５） During rolling, the hot steel pipe from the No. 3 stand was visually observed to determine whether or not the steel pipe had bite or edge flaws. Then, the soot generation rate (%) was obtained based on the equation (5).
Crack generation rate (%) = (Number of steel pipes with biting or edge cracks / total number of steel pipes drawn and drawn) × 100 (5)
　Ａセットでの絞り圧延を終了した後、３番スタンドのロールをＡセットからＢセットに取り替えた。他のスタンドのロールは取り替えなかった。Ｂセットのロールを３番スタンドに取り付けた後、Ａセットの場合と同様に、鋼管２０本に対して絞り圧延を実施した。このとき、鋼管の材質、絞り圧延全体での外径加工度は、Ａセットの場合と同じであった。 ¡After finishing the rolling with A set, the roll of No. 3 stand was changed from A set to B set. The rolls of the other stands were not replaced. After the B set roll was attached to the No. 3 stand, as in the case of the A set, 20 steel pipes were drawn. At this time, the material of the steel pipe and the outer diameter processing degree in the whole drawing rolling were the same as in the case of the A set.
　Ａセットの場合と同様に、３番スタンドから出た熱間の鋼管を目視観察し、鋼管に噛み出し疵又はエッジ疵が発生しているか否かを判断した。そして、式（５）に基づいて、疵発生率（％）を求めた。 As in the case of A set, the hot steel pipe from the No. 3 stand was visually observed to determine whether or not the steel pipe had bite or edge flaws. Then, the soot generation rate (%) was obtained based on the equation (5).
　Ｂセットでの絞り圧延を終了した後、３番スタンドのロールをＢセットからＣセットに取り替えた。そして、Ａセット、Ｂセットと同じ条件で圧延を実施し、式（５）に基づいて、疵発生率を求めた。 後 After finishing the rolling with B set, the roll of No. 3 stand was changed from B set to C set. And rolling was implemented on the same conditions as A set and B set, and the wrinkle generation rate was calculated | required based on Formula (5).
　［調査結果］
　表１に調査結果を示す。表１を参照して、ＢセットのロールのＦ１値は式（１）を満たし、かつ、Ｆ２値は式（２）を満たした。そのため、Ｂセットのロールを使用した絞り圧延では、疵発生率が０％であった。 [Investigation result]
Table 1 shows the survey results. With reference to Table 1, F1 value of the roll of B set satisfy | filled Formula (1), and F2 value satisfy | filled Formula (2). Therefore, the wrinkle generation rate was 0% in the drawing rolling using the B set roll.
　一方、Ｃセットのロールは、式（１）及び式（２）を満たさなかった。そのため、疵発生率が高く、３０．０％であった。また、Ａセットのロールは、式（１）及び式（２）を満たさなかった。そのため、疵発生率は、２０．０％であった。 On the other hand, the roll of C set did not satisfy the expressions (1) and (2). Therefore, the soot generation rate was high and was 30.0%. Moreover, the roll of A set did not satisfy | fill Formula (1) and Formula (2). Therefore, the soot generation rate was 20.0%.
　以上、本発明の実施の形態を説明したが、上述した実施の形態は本発明を実施するための例示に過ぎない。よって、本発明は上述した実施の形態に限定されることなく、その趣旨を逸脱しない範囲内で上述した実施の形態を適宜変形して実施することが可能である。 As mentioned above, although embodiment of this invention was described, embodiment mentioned above is only the illustration for implementing this invention. Therefore, the present invention is not limited to the above-described embodiment, and can be implemented by appropriately modifying the above-described embodiment without departing from the spirit thereof.

Claims (2)

  1. 　鋼管を絞り圧延する３ロール式絞り圧延機に用いられ、横断面で弓状をなす溝を有するカリバ部と、前記カリバ部に隣接するフランジ部とを備える絞り圧延用ロールの製造方法であって、
    　前記絞り圧延用ロールを準備する工程と、
    　前記絞り圧延用ロールをロール軸まわりに回転し、前記カリバ部と前記フランジ部との隣接部分に形成される稜部を切削して前記稜部に丸みをもたせる工程とを備え、
    　前記稜部に丸みをもたせる工程では、
    　前記稜部の頂上を中心とした前記ロール軸方向に３．０ｍｍの範囲の稜部領域において、０．５ｍｍピッチで測定された曲率半径の平均を２．５ｍｍ～３．０ｍｍとし、かつ、前記曲率半径の最大値と最小値との差分を１．０ｍｍ以下にする、絞り圧延用ロールの製造方法。     A method for producing a drawing roll, which is used in a three-roll drawing mill for drawing a steel pipe and includes a caliber portion having a groove having an arcuate cross section and a flange portion adjacent to the caliber portion. ,
    Preparing the drawing roll, and
    Rotating the drawing roll around a roll axis, cutting a ridge formed in an adjacent portion of the caliber portion and the flange portion, and rounding the ridge portion,
    In the step of rounding the ridge,
    In the ridge region in the range of 3.0 mm in the roll axis direction around the top of the ridge, the average radius of curvature measured at a pitch of 0.5 mm is 2.5 mm to 3.0 mm, and The manufacturing method of the roll for drawing rolling which makes the difference of the maximum value and minimum value of a curvature radius 1.0 mm or less.
  2. 　鋼管を絞り圧延する３ロール式絞り圧延機に用いられる絞り圧延用ロールであって、
    　横断面で弓状をなす溝を有するカリバ部と、
    　前記カリバ部に隣接するフランジ部とを備え、
    　前記カリバ部と前記フランジ部との隣接部分に形成される稜部の頂上を中心としたロール軸方向に３．０ｍｍの範囲において、０．５ｍｍピッチで測定された曲率半径の平均が２．５ｍｍ～３．０ｍｍであり、かつ、前記曲率半径の最大値と最小値との差分が１．０ｍｍ以下である、絞り圧延用ロール。     A drawing roll used in a three-roll drawing mill for drawing and rolling a steel pipe,
    A caliber portion having a cross-sectionally arched groove;
    A flange portion adjacent to the caliber portion,
    The average radius of curvature measured at a pitch of 0.5 mm is 2.5 mm in the range of 3.0 mm in the roll axis direction around the top of the ridge formed in the adjacent part of the caliber part and the flange part. A drawing roll having a diameter of ˜3.0 mm and a difference between a maximum value and a minimum value of the radius of curvature of 1.0 mm or less.
PCT/JP2012/058058 2011-03-31 2012-03-28 Method for manufacturing roll for reducing, and roll for reducing WO2012133484A1 (en)

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BR112013023809-7A BR112013023809B1 (en) 2011-03-31 2012-03-28 METHOD FOR MANUFACTURING CYLINDER FOR REDUCING LAMINATION AND CYLINDER FOR REDUCING LAMINATION
MX2013011178A MX338263B (en) 2011-03-31 2012-03-28 Method for manufacturing roll for reducing, and roll for reducing.
US14/008,587 US20140013815A1 (en) 2011-03-31 2012-03-28 Method for manufacturing roll for reducing rolling, and roll for reducing rolling
EP12765966.2A EP2692453B1 (en) 2011-03-31 2012-03-28 Method for manufacturing roll for reducing, and roll for reducing

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JP2011079759A JP5003833B1 (en) 2011-03-31 2011-03-31 Method for producing drawing roll and drawing roll

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CN114273571B (en) * 2021-12-01 2024-03-22 中北大学 Roller extrusion forming die for cylindrical part with internal grid ribs
CN116078810B (en) * 2023-02-17 2023-11-07 科城精铜(广州)有限公司 Rolling device and method for improving tensile strength of copper rod

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