Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
  • B21B31/16—Adjusting or positioning rolls
  • B21B31/18—Adjusting or positioning rolls by moving rolls axially
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
  • B21B31/07—Adaptation of roll neck bearings
  • B21B31/074—Oil film bearings, e.g. "Morgoil" bearings

Definitions

• the invention relates to a roll stand for hot or cold rolling of rolled strips of different materials, with pairs of work, support and possibly intermediate rolls, of which the rolls of at least one pair of rolls are axially displaceable on both sides and have a suitable contour to compensate for Walzfehier ⁇ .
• EP-B 0 091 540 describes a roll stand of the generic type, which is designed as a four-high or six-high roll stand.
• the support rolls can also be axially displaced relative to one another, the support rolls being displaced either independently of or together with the work rolls.
• work rolls are provided which are supported on intermediate rolls supported by support rolls, the work rolls and / or the support rolls and / or the intermediate rolls being axially displaceable relative to one another and providing the rolls of at least two pairs of rolls with a curved contour extending over the entire length of the bale are composed of a convex and a concave area, the bale contours being mutually supportive or
• rollers complement each other only in a certain relative axial position of these rollers.
• the rollers are mounted in plain bearings that are installed in chocks.
• the chocks are provided with sliding surfaces that slide on each other or on the crossbeams of the roll stand and with push rods axially can be pushed The construction effort required for this construction is considerable
• the invention has for its object the axial displacement of the rolls of a rolling stand with respect to the solution with displaceable
• each displaceable roller has at least one hydrodynamic oil film bearing, in which a hydraulic unit which brings about the axial displacement is integrated
• rollers in their hydrodynamic oil film bearings unlike the sliding surfaces of the chocks, float on their hydrodynamic oil film, the friction is also low in the axial direction. This means that the rollers can be positioned smoothly and smoothly with little effort.
• the integrated hydraulic unit is small compared to the usual ones Push rods and is part of the roller bearing
• Hydraulic unit can be used with all types of rollers (work, support and intermediate rollers)
• the support roll is ground to a n-order cut.
• the front stands of a hot strip mill the
• the CVC work rolls are used for presetting In the rear stands, the work roll shift is used to even out wear and thermal crown.
• the roll gap profile is set with the roll bend.
• the back-up roll shift in the rear stands increases the setting range for the presetting of the roll gap profile and is particularly useful for narrow, soft strips and hard, wide strips.
• the back-up roll is ground to a CVC cut to compensate for x2 errors in order to compensate for the flatness errors.
• the working rollers or intermediate rolls on the six-high stand have a CVC cut to compensate for xn errors.
• the backup roller has the CVC cut
• the hydraulic unit has a ring cylinder fixed to the roll stand, in which a roll-fixed ring piston with an integrated ring is sealingly guided, the hydraulic unit adapts particularly well to the shape of the hydrodynamic oil film bearing.
• Their diameter is only slightly larger than the diameter of the bearing shell of the hydrodynamic oil film bearing.
• the rollers can be moved in both directions.
• the hydraulic oil for both directions of movement is alternatively supplied to the ring piston.
• the position transmitter is used to measure the respective axial position of the axially adjustable rollers. This position is determined using the
• Hydraulic unit Controlled via the control circuit of the roll stand using the signals from the position transmitter.
• a particular advantage of the invention is that the hydrodynamic oil film bearing can be used with the hydraulic unit as a retrofit part. This means that the existing chocks can be used when retrofitting old systems. Only the hydrodynamic oil film bearings need to be replaced. The space-consuming sliding mechanism on the mill stand can be omitted.
• the single figure shows a longitudinal section through a hydrodynamic oil film bearing with a hydraulic unit in the right end position. Inside is a roll stand (1) (or
• a chock in which a bearing bush (2) of a hydrodynamic oil film bearing (3) is arranged.
• the associated pin bushing (4) sits with a clamping cone on the roll pin (5) of a roll (6).
• An annular cylinder (7) in which an annular piston (8) is guided in a sealing manner is attached to the stand (1). This is connected to the roll neck (5) via tapered roller bearings (9).
• the ring piston (8) has on its circumference a ring (10) which is axially displaceable in a groove (11) of the ring cylinder (7) with the ring piston (8).
• the groove (1 1) forms together with the annular piston (8) an annular space (12) which is divided by the ring (10).
• the parts of the annular space (12) are connected to control hydraulics of the roll stand via separate hydraulic connections (13).
• the free end of the roll neck (5) is covered oil-tight by a cover (14).
• a position sensor (15) is attached to this and is connected to the free end of the roll neck (5) via a connecting rod (16).
• Ring cylinder (7), ring piston (8) and position transmitter (15) form a hydraulic unit (17).
• the arrangement according to the invention functions as follows: If the roller (6) needs to be axially displaced, depending on the desired direction of adjustment, the right or left hydraulic connection is pressurized with pressure oil. This works u. a. on the ring surface of the ring (10) and thereby exerts an axial force which is transmitted via the tapered roller bearings (9) to the roller pin (5) of the roller (6) with low friction. The axial displacement of the roll neck (5) is transmitted via the connecting rod (16) to the position transmitter (15), which in turn controls the pressure oil flow to reach the desired roll position.
• the arrangement according to the invention offers a simple, safe and space-saving axial displacement device, which because of its Full encapsulation requires no maintenance. Because of these properties, it is also suitable for retrofitting in chocks of existing roll stands.

Landscapes

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

Applications Claiming Priority (3)

Publications (1)

Family

ID=7864547

Family Applications (1)

Country Status (12)

Families Citing this family (10)

Family Cites Families (9)

• 1998
  • 1998-04-15 DE DE19816602A patent/DE19816602C1/de not_active Expired - Fee Related
• 1999
  • 1999-03-26 TW TW088104801A patent/TW396068B/zh not_active IP Right Cessation
  • 1999-04-13 RU RU2000128635/02A patent/RU2218221C2/ru not_active IP Right Cessation
  • 1999-04-13 BR BR9909527-0A patent/BR9909527A/pt not_active Application Discontinuation
  • 1999-04-13 MX MXPA00010080A patent/MXPA00010080A/es active IP Right Grant
  • 1999-04-13 WO PCT/EP1999/002465 patent/WO1999052657A1/de active IP Right Grant
  • 1999-04-13 KR KR1020007011452A patent/KR100562749B1/ko not_active IP Right Cessation
  • 1999-04-13 EP EP99916915A patent/EP1077779A1/de not_active Ceased
  • 1999-04-13 CA CA002328350A patent/CA2328350A1/en not_active Abandoned
  • 1999-04-13 CN CN99805012A patent/CN1297386A/zh active Pending
  • 1999-04-13 JP JP2000543260A patent/JP2002511340A/ja active Pending
• 2006
  • 2006-11-17 US US11/601,202 patent/US20070089470A1/en not_active Abandoned

Non-Patent Citations (1)

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