EP0904166A1 - Procede et systeme d'entretien de surfaces - Google Patents

Procede et systeme d'entretien de surfaces

Info

Publication number
EP0904166A1
EP0904166A1 EP97918434A EP97918434A EP0904166A1 EP 0904166 A1 EP0904166 A1 EP 0904166A1 EP 97918434 A EP97918434 A EP 97918434A EP 97918434 A EP97918434 A EP 97918434A EP 0904166 A1 EP0904166 A1 EP 0904166A1
Authority
EP
European Patent Office
Prior art keywords
roll
tool
distance
pressure against
chosen
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP97918434A
Other languages
German (de)
English (en)
Inventor
Gisela E. Berg
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0904166A1 publication Critical patent/EP0904166A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
    • B24B5/02—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work
    • B24B5/16—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work for grinding peculiarly surfaces, e.g. bulged
    • B24B5/167—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work for grinding peculiarly surfaces, e.g. bulged for rolls with large curvature radius, e.g. mill rolls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B28/00—Maintaining rolls or rolling equipment in effective condition
    • B21B28/02—Maintaining rolls in effective condition, e.g. reconditioning
    • B21B28/04—Maintaining rolls in effective condition, e.g. reconditioning while in use, e.g. polishing or grinding while the rolls are in their stands

Definitions

  • This invention relates to the rolling of materials, e.g. metallic materials, and especially light metals, and/or casting such materials with so-called roll casting or band casting. More precisely the invention is related to a method for avoiding the problems leading to surface roughness on the produced material increasing over time as a result of the creation of defects on the roll surface.
  • an outer oxide layer is, among other things, generated at the surface of the roll. This has proven to have a favourable effect as it reduces the tendency of the rolled material to stick to the oxide layer compared to the untreated surface of a new roll.
  • German patent application 44 09 300 teaches another variant of such grinding of rolls. It do, as far as it goes, have the same disadvantages concerning size and grinding amount. It is of course both possible and preferable not to let such equipment be used continuously, so as to reduce the pollution problem, but any way such equipment because if its size will not be very suitable in roll casting.
  • a completely different essential disadvantage with the apparatus according to this application is - as in the abovementioned case - that the grinding method is so coarse that the oxide layer is removed completely, which is strongly unwanted because of the sticking effect that thereby arises.
  • EP 154.319 an apparatus is described for grinding of parts of rolls. The background for this is that rolls being used for rolling materials with different width will be worn differently.
  • US 4.575.972 discloses a grinding machine for rolls using an abrasive belt. This is not suitable regarding the protruding areas this invention is aimed at, since the paper band will follow the surface and thus grind between the protruding areas. This in turn affects the oxide layer, with following problems with sticking.
  • this invention do not only provide a method which, with simple means secure a better surface quality over time, but it also represents a breakthrough concerning the understanding, recognition of the problem.
  • the method according to the invention allows for production of rolled material with a nearly perfect surface for longer periods of time without much maintenance, at the same time as the rolls/roll shells is improved considerably.
  • roll casting which is performed with water filled roll shells with a relatively limited shell thickness, the improvement is substantial.
  • the invention is more specifically related to a method and a system for maintenance of rolls/-shells for rolling of material, such as light metal/aluminium, and casting of such material in so-called roll casting, characterized as stated in the accompanying independent claims.
  • the cracks in the rolls have the same effect as expansion joints for the local thermal expansion in the material when contact is made between the roll shell and the material melt, and causes in itself no significant harm on the produced product. Thus there is no need to remove these cracks.
  • the figure shows a section of rolls and melt in roll casting.
  • the figure shows a section of a roll mill with a roll shell 1, a nozzle 4, melt in to the roll by 2, and casted band 3.
  • the figure shows only the upper roll, but the lower roll is positioned under the broken symmetry line. While the rotation speed of the roll is constant the surface of the material which is casted and which is directly in contact with the roll, will gain speed towards the most narrow cross section between the upper and the lower rolls. As is illustrated (encircled and enlarged) on the figure the mentioned protrusions on the surface of the roll at first make a small feature in the material to be moulded.
  • the protrusion will retain the material because of the relative difference in speed between the roll and the material, and thus cause a depression in the material being considerably longer in the longitudinal direction than size of the protrusion alone should imply.
  • the roll swings outwards and loses contact with the material scraped out material will be left as a small protrusion behind the described depression. This is illustrated in the enlarged portion (encircled) of the figure.
  • a wagon 7 comprising grinding tool, here e.g. a whetstone.
  • the grinding tool is held with a pressure against or a distance from the surface providing a grinding effect on the protrusions. It may be noted that the protrusions need not be removed entirely on each passing of the tool, so that the force with which the tool is held against surface do not have to be big.
  • the grinding tool is kept in contact with the surface with wheels 5 positions in relation to a wagon 5 or similar which keeps the right position in relation to the surface.
  • the wagon may be provided with equipment for rotation of the grinding tool to give a grinding effect, and may be provided with means for adjusting the height of the grinding tool to adapt to wear on the grinding tool, and to perform the grinding at chosen times or intervals.
  • the rotation and height of the grinding tool may be controlled by mechanical settings or actively by known, e.g. electrical, control systems.
  • the grinding tool in figure 2 may cover the whole length of the roll or only a part of it. In the latter case it will preferably be capable of movement in the axial direction of the roll, or may be one of a plurality of tools positioned along the roll, which will give an opportunity to grind at a chosen area on the roll.
  • Figure 3 shows another tool comprising a whetstone 4 positioned in a holder 9.
  • the whetstone may be spring loaded to keep a constant force against the surface and may, similar to the solution in figure 2, comprise devices for lifting and lowering the whetstone in relation to the surface.
  • the holder 9 may also comprise channels for supplying grinding liquids and removal of this together with grinding dust, so that the dust do not pollute the rolled material.
  • the holder 9 is connected to a guiding screw 6 with a groove 8 so that the grinding tool may be moved smoothly in the axial direction to, after a while, be able to grind the whole roll, or so that it may be moved to a chosen area that needs grinding, and be activated there.
  • This invention is, however, not limited to a certain tool for removing of material, as an important feature of the invention is in the recognition that it is the protrusions and not the cracks, that are the key to the problem.
  • any way to remove such protrusions it being manual or automatic, while the equipment is in use or temporarily stopped, when the roll surface is essentially not touched, is within the frame of this invention.
  • Removal of the protrusions may, as mentioned, be done in many different way, using cutting, scraping or grinding tools. An edge positioned close to the surface of the roll will cut off the tops without touching the surface layer, or protrusions may be scraped off by scraping against the surface with a chosen pressure. Laser may also be used to cut the protrusions.
  • control systems may typically be based on such principles as capacitive systems, optical systems, mechanical systems, systems based upon an air cushion principle or combinations of such systems, depending on the accuracy and sophistication with which one wants to control the treatment.
  • Such systems may easily be applied with the present technology in the micro mechanical area.
  • Electrical, optical and/or acoustic measuring systems may be used in a known way to classify the surface, and thus detect the need for treatment over the whole, or parts of, the surface.
  • the situation will be such that continuous removal with the production going is out of the question. This may for example be situations in which the need for space or the consideration of other marginal limitations make it impossible or impractical to work continuously.
  • the rotation will be to big to allow for treatment of the roll while going, e.g. in warm or cold rolling.
  • One may then perform the treatment in periods between the rolling of two pieces, e.g. blocks or coils, as the rolls then will hold a reduced speed.
  • the invention is primarily aimed at casting or rolling of materials with a relatively high melting point, such as metals or typical light metals.
  • a relatively high melting point such as metals or typical light metals.
  • the concept of the invention holds, however, as previously mentioned, for any type of materials casted/rolled between rotating rolls.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Abstract

Ce procédé d'entretien de rouleaux/corps cylindriques destinés à laminer des matériaux, par exemple des métaux légers/aluminium, et à couler de tels matériaux dans des laminoirs, est caractérisé en ce que l'on enlève, de manière continue ou périodique, des petites nervures créées sur la surface du rouleau lors de l'utilisation de celui-ci, et ce à l'aide d'un outil approprié d'usinage, conçu pour laisser essentiellement intacte la couche superficielle du rouleau. L'outil d'usinage peut être commandé par un système actif qui localise les emplacements des nervures, ou un système passif qui, de manière choisie, suit la surface.
EP97918434A 1996-04-25 1997-04-24 Procede et systeme d'entretien de surfaces Withdrawn EP0904166A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
NO961668 1996-04-25
NO961668A NO961668D0 (no) 1996-04-25 1996-04-25 Fremgangsmåte for vedlikehold av valser/valseskall
PCT/NO1997/000108 WO1997039844A1 (fr) 1996-04-25 1997-04-24 Procede et systeme d'entretien de surfaces

Publications (1)

Publication Number Publication Date
EP0904166A1 true EP0904166A1 (fr) 1999-03-31

Family

ID=19899304

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97918434A Withdrawn EP0904166A1 (fr) 1996-04-25 1997-04-24 Procede et systeme d'entretien de surfaces

Country Status (4)

Country Link
EP (1) EP0904166A1 (fr)
AU (1) AU2653997A (fr)
NO (1) NO961668D0 (fr)
WO (1) WO1997039844A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6362957B2 (ja) * 2014-08-07 2018-07-25 新日鐵住金株式会社 圧延ロールの計測装置および圧延ロールの研削方法
EP3515615B1 (fr) * 2016-09-19 2020-01-22 SMS Group GmbH Laminage dans un procédé continu

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE880892A (fr) * 1979-12-27 1980-06-27 Cockerill Dispositif et procede pour polir en continu et pour refroidir uniformement la table d'un cylindre de laminoir
BE880893A (fr) * 1979-12-27 1980-06-27 Cockerill Dispositif de polissage en continu d'un cylindre de pression d'une bobineuse de coils
JPS59156507A (ja) * 1983-02-25 1984-09-05 Ishikawajima Harima Heavy Ind Co Ltd 圧延ロ−ルの研削装置
DE3877675T2 (de) * 1987-09-24 1993-06-09 Mitsubishi Heavy Ind Ltd Kuehltrommel fuer stranggussmaschinen zur herstellung duenner metallischer baender.
US4989375A (en) * 1988-05-28 1991-02-05 Noritake Co., Limited Grinding wheel having high impact resistance, for grinding rolls as installed in place
JPH0675730B2 (ja) * 1989-05-19 1994-09-28 三菱重工業株式会社 ロールの研削方法
FI90503C (fi) * 1991-06-14 1994-02-25 Valmet Paper Machinery Inc Menetelmä paperikoneen telan kunnostuksessa

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9739844A1 *

Also Published As

Publication number Publication date
AU2653997A (en) 1997-11-12
NO961668D0 (no) 1996-04-25
WO1997039844A1 (fr) 1997-10-30

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