Classifications

• • 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
  • B21B27/03—Sleeved rolls
  • B21B27/035—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
  • B21B19/00—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
  • B21B19/02—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers
  • B21B19/04—Rolling basic material of solid, i.e. non-hollow, structure; Piercing, e.g. rotary piercing mills
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B23/00—Tube-rolling not restricted to methods provided for in only one of groups B21B17/00, B21B19/00, B21B21/00, e.g. combined processes planetary tube rolling, auxiliary arrangements, e.g. lubricating, special tube blanks, continuous casting combined with tube rolling

Definitions

• the present invention relates to a disk roll and a seamless pipe manufacturing method using the disk roll, and more particularly to a disk roll used in a piercing and rolling machine and a seamless pipe manufacturing method using the disk roll.
• a seamless steel pipe is manufactured by piercing and rolling a billet with a piercing and rolling mill.
• piercing and rolling mill 100 includes two disc rolls 200 arranged up and down around pass center o, and two inclined ports arranged on the left and right around pass center O. With.
• the transverse shape of the outer peripheral surface 200F of the disc roll 200 is concave.
• the billet 400 during piercing and rolling advances while rotating in the circumferential direction by the inclined roll 300.
• the outer peripheral surface 200F of the disk roll 200 comes into contact with the billet 400 and restrains the billet 400 by restraining the billet 400, thereby stabilizing the piercing and rolling.
• the outer diameter of the side surface 200SI corresponding to the rotation entry side of the billet 400 rotating in the circumferential direction corresponds to the rotation exit side of the billet 400 rotating in the circumferential direction. Side is larger than the outer diameter of 200SO.
• the gap (gap) G1 and G2 between the side surface 200SI of the disc roll 200 and the inclined roll 300 is wide on the rotation entry side of the billet 400, the rotating billet 400 protrudes from the gaps G1 and G2.
• Such protrusion is called a peeling phenomenon.
• the outer diameter of the side surface 200SO on the rotation side is approximately the same as that of the side surface 200SI on the rotation side, the billet 400 is excessively restrained by the disk roll 200 and is difficult to rotate in the circumferential direction. Therefore, the outer diameter of side 200SO is made smaller than side 200SI.
• such a disk roll 200 includes a disc-shaped shaft member 201 having a drive shaft 203 at the center, and an annular member 2 attached to the outer periphery of the shaft member 201 by shrink fitting. It is composed of 02. As described above, the outer peripheral surface 200F of the annular member 202 is worn because it contacts the billet 400 during piercing and rolling. The worn ring member 202 is replaced with a new one.
• the annular member 202 has a large outer diameter of about lm to 4 m. Therefore, the annular member 202 is difficult to carry, and the work load of removing from the shaft member 201 and attaching to the shaft member 201 is large.
• the annular member 202 is usually integrally formed by forging a billet. Therefore, the manufacturing process is complicated and the manufacturing cost is high.
• JP-A-5-277511 Patent Document 1
• JP-A-8-215714 Patent Document 2
• the invention of Patent Document 1 aims to reduce the gap between the piercing roll and the display roll
• the invention of Patent Document 2 pierces and rolls a thin hollow shell with a high expansion ratio. It is an object. That is, it is not an invention that solves the difficulty in manufacturing and transporting the disk roll. Disclosure of the invention
• An object of the present invention is to provide a disk roll that can be easily manufactured and transported, and a method for manufacturing a seamless pipe using the disk roll.
• the disc roll according to the present invention is used in a piercing and rolling mill.
• the disc roll includes a shaft member and an annular member.
• the shaft member has a disk roll drive shaft at its center, and has a disk shape.
• the annular member is attached to the outer periphery of the shaft member, and the transverse shape of the outer peripheral surface of the annular member is concave.
• the annular member also includes a plurality of arcuate members arranged in the circumferential direction.
• the annular member of the disc roll according to the present invention is composed of a plurality of circular members arranged in the same circumferential direction, it is not necessary to integrally mold the annular member. Therefore, the manufacturing cost can be reduced. Moreover, it can convey easily by dividing
• the outer diameter of one side surface of the annular member is larger than the outer diameter of the other side surface.
• Each of the circular arc-shaped members has an inner surface ridge formed along the edge on the side surface having a larger outer diameter on the inner peripheral surface.
• the shaft member has an outer surface ridge that is formed along one side edge of the outer peripheral surface and fits with the inner surface ridge.
• One of the inner surface ridge and the outer surface ridge has a screw hole on the surface facing the other.
• the other of the inner surface ridge and the outer surface ridge has a through hole at a position facing the screw hole, and a screw is inserted into the through hole and the screw hole to fix the arc-shaped member to the shaft member. .
• the inner surface ridge of the arc-shaped member is fitted with the outer surface ridge of the shaft member.
• the billet advances while rotating from a side surface having a large outer diameter (hereinafter referred to as an entering side surface) to a side surface having a small outer diameter (hereinafter referred to as an exit side surface).
• an urging force acts on the arc-shaped member from the entrance side surface to the exit side surface, and the inner surface ridges are maintained in a state of being biased by the outer surface ridges. Therefore, the arc-shaped member is less likely to break during the piercing and rolling, and the shaft member does not easily come off.
• one of the inner surface ridge and the outer surface ridge has a fitting ridge formed along a circumferential direction on a surface facing the other.
• the other of the inner surface ridge and the outer surface ridge has a groove that fits with the fitting ridge at a position facing the fitting ridge.
• the outer surface protrusion has a screw hole on a surface facing the inner surface protrusion, and the inner surface protrusion has a through hole at a position facing the screw hole.
• the diameter of the insertion hole is deeper than the height of the screw head from the entrance side and smaller than the diameter of the screw head from the predetermined position to the exit side, which is larger than the diameter of the screw head.
• the screw head can be embedded in the inner ridge, and the screw head enters and does not protrude from the side surface.
• the entrance side of the scroll should be close to the inclined roll to reduce the gap between the disc roll and the inclined roll. If the screw head is inserted and the side force protrudes, the gap cannot be reduced.
• both end surfaces of each arc-shaped member are inclined with respect to the inner peripheral surface, and the arc-shaped members adjacent to each other are fitted on end surfaces facing each other.
• the seamless pipe manufacturing method according to the present invention uses a piercing and rolling mill having an inclined roll and the above-described disk roll.
• the method for producing a seamless pipe according to the present invention includes a step of determining whether the billet traveling speed determined by the rotational speed of the inclined roll is faster than the disk roll rotating speed, and, as a result of the determination, the billet traveling speed.
• the disk roll is installed in the piercing and rolling mill in which the outer peripheral surface side of each arc-shaped member is inclined more in the rotational direction of the disk roll than the inner peripheral surface side, and the billet proceeds
• the arcuate member to be applied is determined based on the result of comparing the billet traveling speed with the rotational speed of the disk roll.
• the gap extends in the direction opposite to the relative speed of the billet to the disc roll from the outer peripheral surface toward the inner peripheral surface. As a result, part of the billet can be prevented from entering the gap during piercing and rolling.
• FIG. 1A is a side view of a disk roll according to an embodiment of the present invention.
• FIG. 1B is a front view of the disc roll shown in FIG. 1A.
• FIG. 2 is an enlarged view of a region 50 in FIG.
• FIG. 3 is a cross-sectional view taken along line ⁇ — ⁇ in FIG.
• FIG. 4 is a schematic diagram for explaining the force applied to the arcuate member of the disk roll during piercing and rolling.
• FIG. 5 is a schematic diagram showing the configuration of a piercing and rolling mill when the billet travel speed is larger than the rotational speed of the disk roll.
• FIG. 6 is a schematic diagram showing the configuration of a piercing and rolling mill when the billet traveling speed is smaller than the rotational speed of the disk roll.
• FIG. 7 is a cross-sectional view of a disk roll having another configuration different from that in FIG.
• FIG. 8 is a cross-sectional view of a dill crawl having another configuration different from those in FIGS. 3 and 7.
• FIG. 9 is a cross-sectional view of a disc roll having another configuration different from those of FIGS. 3, 7 and 8.
• FIG. 10 is a side view of a conventional piercing and rolling machine using a disk roll.
• FIG. 11 is a schematic diagram of a conventional piercing and rolling mill that also shows the billet exit force.
• FIG. 12 is a schematic diagram showing the configuration of the disk roll in FIGS. 10 and 11.
• the disk roll 1 is installed in a piercing mill 100 instead of the disk roll 200 shown in FIGS. 10 and 11.
• the disc roll 1 includes a shaft member 10 and an annular member 20 fitted on the outer periphery of the shaft member 10.
• the shaft member 10 has a disk shape, and has a drive shaft 16 for the disk roll 1 at the center thereof.
• a plurality of through holes 17 are formed at equal intervals in the circumferential direction.
• the annular member 20 is annular and is fitted to the shaft member 10.
• the transverse shape of the outer peripheral surface of the annular member 20 is a concave bow shape.
• the cross-sectional shape may be a concave groove shape. This outer peripheral surface comes into contact with the billet being pierced and rolled, and can restrain the billet to some extent, and serves as a guide.
• the annular member 20 includes a plurality of arc-shaped members 30 arranged in a line in the circumferential direction. Each arcuate member 30 is fixed to the outer periphery of the shaft member 10 using screws.
• the annular member 20 of the disc roll 1 according to the present embodiment is composed of the plurality of arc-shaped members 30, it is not necessary to integrally mold the annular member. Therefore, manufacturing costs can be reduced. Further, it can be easily transported by being divided into the respective arc-shaped members 30, and can be easily attached to and detached from the shaft member 10.
• each arcuate member 30 is obtained by dividing annular member 20, and its side surface is arcuate.
• a ridge hereinafter referred to as an inner surface ridge
• an inner surface ridge is formed along the edge of the entering side surface 30SI.
• a fitting ridge is formed along the edge of the inner surface ridge 33, that is, along the circumferential direction.
• a ridge (hereinafter referred to as an outer surface ridge) 12 is formed along one side edge thereof, and the fitting surface 13 of the outer surface ridge 12 is formed.
• a recess 14 is formed at a position facing the fitting protrusion 35.
• the inner surface protrusions 33 of the arc-shaped member 30 are fitted with the outer surface protrusions 12 of the shaft member 10, and the fitting protrusion 35 is the recess 14 Mates with.
• a through hole 36 extending from the entering side surface 30SI to the fitting surface 34 is formed in the inner surface protrusion 33.
• the outer surface protrusion 12 has a screw hole 15 at a position facing the through hole 36 in the fitting surface 13.
• Each arc-shaped member 30 is fixed to the shaft member 10 by inserting the screw 40 into the through hole 36 and screwing it into the screw hole 15.
• three through holes 36 of each arcuate member 30 are formed at equal intervals in the circumferential direction of the disk roll 1, and the number of force through holes 36 may be one or plural. Good
• the billet 400 advances while rotating from the entering side surface of the disc roll 1 to the exit side surface. Therefore, the directional force F0 acts on the arc-shaped member 30 during piercing and rolling from the entering side surface 30SI to the exit side surface 30SO, and the inner surface ridge 33 is pressed against the outer surface ridge 12 by the force F0. Therefore, the arcuate member 30 is fixed by the shaft member 10 using the force F0 received from the billet 400 during piercing and rolling. In addition, the excessively loaded load on the screw 40 during piercing and rolling makes it difficult for the screw 40 to break. As shown in FIG. 3, the screw head 41 of the screw 40 enters the through hole 36.
• the screw head 41 does not protrude from the entering side surface 30SI. Specifically, of the through hole 36, the diameter D1 of the through hole 36 from the entry side 30SI on the insertion side of the screw 40 to the depth L1 deeper than the height LO of the screw head 41 is the screw head 41. The diameter is larger than DO. The diameter D2 of the through hole 36 from the depth L1 to the fitting surface 34 is smaller than the diameter DO of the screw head 41.
• the screw head 41 is embedded in the inner surface protrusion 33 and does not protrude from the entering side surface 30SI.
• the entrance side 30SI of disc roll 1 approaches the inclined roll 300 and the gaps G1 and G2 between disc roll 1 and inclined roll 300 Must be narrowed. If the screw head 41 enters and protrudes from the side surface 30SI, the gaps G1 and G2 cannot be narrowed accordingly. Since the screw head 41 is embedded in the inner surface protrusion 33, the gaps G1 and G2 can be narrowed, and the occurrence of the peeling phenomenon can be suppressed.
• both end surfaces 37 of each arcuate member 30 are flat and are inclined with respect to the inner peripheral surface 31.
• Two adjacent arc-shaped members 30 are fitted on end faces 37 facing each other. More specifically, one end surface 37 of each arc-shaped member 30 is inclined at an angle of 0 ° (0 ° or 0 ° 180 °) with respect to the inner peripheral surface 31, and the other end surface 37 is an inner peripheral surface. It is inclined at (180- ⁇ ) ° with respect to 31. Since one angle of the end surface 37 is ⁇ ° and the other angle is 180 ⁇ °, the end surfaces of the arcuate members 30 adjacent to each other are fitted.
• a method for manufacturing a seamless pipe using the disk roll 1 having the above-described configuration is as follows.
• the traveling speed of the billet 400 during piercing and rolling is greater than the rotational speed of the disk roll 1.
• the traveling speed of billet 400 during piercing and rolling is calculated based on the rotational speed of inclined roll 300. Therefore, it can be judged before the actual piercing and rolling.
• the traveling speed V400 of the billet 400 is greater than the rotational speed VI of the disc roll 1
• the outer circumference of the end surface 37 of each arcuate member 30 is determined.
• the disc roll 1 is used in which the surface side 371 is inclined in the rotational direction of the disc roll from the inner peripheral surface side 372. In FIG. 5, the inclined roll is omitted.
• the gap is directed from the outer peripheral surface 39 to the inner peripheral surface 31 in a direction opposite to the direction of the relative speed Vr of the billet to the disc roll 1. Since it extends, it is difficult for a part of the billet 400 to enter the gap.
• the fitting ridge 35 is provided along the edge of the fitting surface 34 of the inner surface ridge 33.
• the fitting protrusion 35 may be formed on the surface along the circumferential direction.
• the fitting ridge 35 may be formed on the fitting surface 13, and the groove 14 corresponding to the fitting ridge 35 may be formed on the fitting surface 34.
• the shaft member 10 The through-hole 36 may be provided in the outer ridge 12, and the screw hole 15 may be provided at a corresponding position of the arcuate member 30.
• the inner surface ridge 33 and the outer surface ridge 12 may be fitted without forming the fitting ridge 35 and the groove 14.
• the two disk rolls 1 may be arranged on the left and right sides of the force that is arranged up and down around the path center O.
• the inclined rolls 300 are arranged up and down.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• Geometry (AREA)
• Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
• Metal Rolling (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

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Citations (4)

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• 2007
  • 2007-02-15 EP EP07714293.3A patent/EP1985385B1/en not_active Ceased
  • 2007-02-15 WO PCT/JP2007/052763 patent/WO2007094424A1/ja active Application Filing
  • 2007-02-15 JP JP2008500548A patent/JP4780192B2/ja not_active Expired - Fee Related
  • 2007-02-15 CN CNU2007900000433U patent/CN201275544Y/zh not_active Expired - Lifetime

Patent Citations (4)

Non-Patent Citations (1)

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