Classifications

• • 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
• • 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
  • B21B17/02—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel, i.e. the mandrel rod contacts the rolled tube over the rod length
  • B21B17/04—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel, i.e. the mandrel rod contacts the rolled tube over the rod length in a continuous process
• • 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
  • B21B19/06—Rolling hollow basic material, e.g. Assel mills
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B25/00—Mandrels for metal tube rolling mills, e.g. mandrels of the types used in the methods covered by group B21B17/00; Accessories or auxiliary means therefor ; Construction of, or alloys for, mandrels or plugs
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B25/00—Mandrels for metal tube rolling mills, e.g. mandrels of the types used in the methods covered by group B21B17/00; Accessories or auxiliary means therefor ; Construction of, or alloys for, mandrels or plugs
  • B21B25/02—Guides, supports, or abutments for mandrels, e.g. carriages or steadiers; Adjusting devices for mandrels

Definitions

• the invention relates to methods and apparatus for rolling rolling in one
• Rolling mills with cross rolling mills are used, for example, to roll metallic seamless tubes or other rolling stock of round cross-section, such as bars.
• a cross rolling mill In a cross rolling mill several rolls are arranged on the circumference of a rolling stock to be rolled. The rolling stock is rotated between these rolls rotating in the same direction of rotation and thereby formed. In order to obtain a movement of the rolling stock in the longitudinal direction, the rollers are tilted in the tangential plane at a certain angle to the rolling stock longitudinal axis. This arrangement thus ensures a helical movement of the rolling stock.
• German Patent 195 10 715 C2 describes such
• the structure of the device of DE 195 10 715 C2 has a moving over a main drive rotor, which encloses the rolling stock and are rotatably mounted in the four planetary rollers. These planetary rollers rotate as such with the rotor. In addition to rotation with the rotor, the planetary rollers are rotationally driven by an auxiliary drive about their longitudinal axis.
• a longitudinal rolling mill or another planetary cross rolling mill can be subordinated.
• the invention is based on the basic idea that rolled material, at least during a period of time, both simultaneously in the planetary cross-rolling mill and in the subsequent rolling mill to roll on a mandrel bar.
• the invention provides a mandrel having a length which is greater than the distance between the planetary cross rolling mill and the further rolling mill in
• Rolling direction and in particular is greater than the hollow block length. It is desirable that the mandrel bar is long enough to engage at least one set of rolls of the downstream rolling mill when the pipe leaving the planetary cross rolling mill arrives at that same set of rolls. The mandrel engages when the wall thickness of the pipe is reduced by the rolls of the respective rolling mill on the mandrel.
• the invention makes it possible to distribute the forming work better on the two rolling mills.
• the planetary cross rolling mill can now be used to roll a precursor whose accuracy is also lower
• Slanting roll only single, fixed mandrel bar diameter vorzuhalten and make the transformation of the rolling stock on any intervening cross section through the further rolling mill. This reduces the number of mandrel bars that must be kept by the operator. In addition, the number of mandrel bar changes can be reduced, whereby the time utilization is improved. Furthermore, the stretch of the rolling stock can be distributed to both stands, so that higher rolling speeds are achieved in the finishing mill.
• a rolling mill for rolling of rolling stock with a piano-type cross-rolling mill and a following in the rolling direction following Rolling mill on a mandrel bar which has a length which is greater than the distance between the planetary cross-rolling mill and the further rolling mill in the rolling direction, and particularly preferably longer than the hollow block length.
• the distance between the planetary cross rolling mill and the further rolling mill in the rolling direction in particular the distance between the point of the planetary
• the mandrel rod can - as desired according to the invention - pass through the rolling stock, while it is the rolling stock both in the nip of the planetary cross rolling mill and in the nip of the other rolling mill.
• a holder for the mandrel bar which can hold the mandrel in a position in which the mandrel passes through the nip of the planetary cross rolling mill and at the same time at least partially projects into a nip of the further rolling mill.
• the holder is provided on the side facing away from the further rolling mill of the planetary cross rolling mill.
• a linear drive for linear method of holding the mandrel is provided.
• the planetary cross rolling mill in the rolling direction is subsequently arranged a longitudinal rolling mill.
• a longitudinal rolling mill is understood in particular to mean a rolling mill with rolls whose axes are arranged parallel to one another and / or in each case perpendicular to the rolling direction.
• the mandrel bar is formed in several parts.
• the mandrel has different diameters in a preferred embodiment. Is the mandrel multi-part design, so can the
• a measuring device for determining the rotation of the rolling stock is arranged between the further rolling mill and the planetary cross rolling mill.
• the further rolling mill is a longitudinal rolling mill, in which the rolling stock is to be rolled almost free of rotation, it is advantageous to provide a control of the planetary cross rolling mill, which controls the operation of the planetary cross-rolling mill based on the measurement of the measuring device such that the Rolled material not rotated.
• the planetary cross rolling mill has a main drive for rotating a rotor comprising the rolling stock and planetary rollers rotatably mounted in the rotor. Furthermore, the planetary cross rolling mill has a main drive for rotating a rotor comprising the rolling stock and planetary rollers rotatably mounted in the rotor. Furthermore, the planetary cross rolling mill has a main drive for rotating a rotor comprising the rolling stock and planetary rollers rotatably mounted in the rotor. Furthermore, the planetary
• Slanting mill of the preferred embodiment an additional drive for rotating the planetary rollers about its longitudinal axis.
• a planetary cross rolling mill For a preferred construction of a planetary cross rolling mill, reference is also made to DE 195 10 715 C2, whose description of a structure for a planetary cross rolling mill is made part of this description.
• the planetary cross rolling mill preferably has three or more planetary rollers, in particular four planetary rollers.
• the rolling stock is during a rolling period both in the nip of the planetary cross rolling mill and in the nip of the further rolling mill.
• the rolling stock is located during the major part of the rolling both in the nip of the planetary cross-rolling mill and in the nip of the other rolling mill.
• the rolling stock is only during the unavoidable start-up and shut-down phase either only in the nip of the planetary cross-rolling mill or in the nip of the other rolling mill.
• a mandrel passes through the rolling stock, while the rolling stock in both
• the method according to the invention is preferably used for rolling tubular rolling stock into so-called lumps.
• the rolling stock is preferably metallic, but may also be of other material, for example plastic.
• the inventive method and the rolling mill according to the invention are particularly well suited for rolling particularly thin-walled rolling stock.
• FIG. 1 shows the rolling mill according to the invention with a planetary cross rolling mill and a longitudinal rolling mill with a rolling stock to be rolled in a schematic side view and Fig. 2, the rolling mill of FIG. 1 in the rolled state in a schematic side view.
• a rolling mill consisting of a planetary cross rolling mill 20, a longitudinal rolling mill 25 and a measuring device 8 arranged therebetween is shown.
• a mandrel 10 is held in a holder 11.
• a linear drive 12 can move the holder 11 linearly.
• the mandrel bar 10 has a length which is greater than the distance between the planetary cross rolling mill 20 and the longitudinal rolling mill 25.
• the rolling stock 6 is placed on a mandrel bar both in the planetary cross rolling mill 20 and in the longitudinal rolling mill 25 rolled.
• the planetary cross rolling mill 20 consists of several planetary rollers 1, which roll with their lower portions on the rolling stock 6.
• the planetary rollers 1 are inclined relative to the longitudinal axis of the rolling stock 6 both in the vertical and in the horizontal plane.
• the planetary rollers 1 are rotatably mounted at their rear end in a rotor 2, whose axis of rotation coincides with the longitudinal axis of the rolling stock.
• the rotor 2 is driven via a transmission from the output shaft 3 of a main drive.
• the rotor 2 and the planetary rollers 1 mounted in it lead a
• the sun gear 5 is driven via a transmission of the output shaft 7 of a superposition drive (auxiliary drive). This rotational movement of the sun gear leads to a superimposed rotation of the planetary rollers 1, which results from the sum of the two rotational movements.
• Planetary Rolling 1 changes during the rolling process due to varying parameters such as areal changes in material properties of the rolling stock, temperature variations, scaling, or changes in surface friction values.
• a measuring device 8 is arranged, which possibly through
• Fig. 2 shows the rolling mill in the so-called "rolled out” state in which the

Landscapes

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

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=39429071

Family Applications (1)

Country Status (8)

Families Citing this family (1)

Citations (4)

Family Cites Families (3)

• 2007
  • 2007-03-21 DE DE102007014079A patent/DE102007014079A1/de not_active Withdrawn
• 2008
  • 2008-03-20 US US12/531,723 patent/US20100107713A1/en not_active Abandoned
  • 2008-03-20 WO PCT/EP2008/002235 patent/WO2008113588A1/de active Application Filing
  • 2008-03-20 AT AT08716648T patent/ATE524248T1/de active
  • 2008-03-20 CN CN200880009123A patent/CN101657275A/zh active Pending
  • 2008-03-20 RU RU2009138747/02A patent/RU2009138747A/ru not_active Application Discontinuation
  • 2008-03-20 JP JP2010500117A patent/JP2010521317A/ja not_active Withdrawn
  • 2008-03-20 EP EP08716648A patent/EP2121208B1/de not_active Not-in-force

Patent Citations (4)

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