EP0021812B1 - Spray unit - Google Patents

Spray unit Download PDF

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Publication number
EP0021812B1
EP0021812B1 EP80302094A EP80302094A EP0021812B1 EP 0021812 B1 EP0021812 B1 EP 0021812B1 EP 80302094 A EP80302094 A EP 80302094A EP 80302094 A EP80302094 A EP 80302094A EP 0021812 B1 EP0021812 B1 EP 0021812B1
Authority
EP
European Patent Office
Prior art keywords
header tank
spray
rolls
nozzles
rolling mill
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.)
Expired
Application number
EP80302094A
Other languages
German (de)
French (fr)
Other versions
EP0021812A1 (en
Inventor
Victor Marsh
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.)
Davy Mckee Sheffield Ltd
Original Assignee
Davy Mckee Sheffield Ltd
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 Davy Mckee Sheffield Ltd filed Critical Davy Mckee Sheffield Ltd
Priority to AT80302094T priority Critical patent/ATE3616T1/en
Publication of EP0021812A1 publication Critical patent/EP0021812A1/en
Application granted granted Critical
Publication of EP0021812B1 publication Critical patent/EP0021812B1/en
Expired legal-status Critical Current

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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
    • B21B27/06—Lubricating, cooling or heating rolls
    • B21B27/10—Lubricating, cooling or heating rolls externally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
    • B05B15/55—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter using cleaning fluids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0233—Spray nozzles, Nozzle headers; Spray systems
    • 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
    • B21B27/06—Lubricating, cooling or heating rolls
    • B21B27/10—Lubricating, cooling or heating rolls externally
    • B21B27/106—Heating the rolls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/004—Heating the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0239—Lubricating
    • B21B45/0245—Lubricating devices
    • B21B45/0248—Lubricating devices using liquid lubricants, e.g. for sections, for tubes
    • B21B45/0251—Lubricating devices using liquid lubricants, e.g. for sections, for tubes for strips, sheets, or plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0269—Cleaning
    • B21B45/0275—Cleaning devices
    • B21B45/0278—Cleaning devices removing liquids
    • B21B45/0284—Cleaning devices removing liquids removing lubricants

Definitions

  • This invention relates to a spray unit for discharging liquid at a rolling mill and for cooling or heating, and lubricating the rolls and material being rolled.
  • the invention also relates to a rolling mill, particularly for rolling metal, having one or more such spray units.
  • an olvwater emulsion When producing tin plate gauges, an olvwater emulsion is used.
  • the emulsion is relatively unstable, the oil phase having a high fat content and a high setting temperature. If allowed to cool, the emulsion thus tends to separate into its component water and oil phases. It is thus necessary to ensure that the lubricating emulsion is suitably heated during delivery.
  • atomization is not always desirable and, as will be described below, there are other problems associated with the use of an oil/water emulsion of high setting temperature which such techniques do not solve.
  • the temperature across a roll or rolls is varied by having a series of spray nozzles spaced along the roll barrel and selectively controlling the nozzles by isolating valves between the nozzles and a header tank from which the nozzles are supplied.
  • the emulsion is circulated from a heated storage reservoir to the spray header tank or tanks at the mill stand and returned via the mill sump back to the reservoir.
  • the header tank is provided with means enabling the spray-nozzles to be cleared should they become obstructed.
  • the present invention relates to a spray unit for a rolling mill comprising a header tank which is adapted to be mounted adjacent the mill rolls and which has connection means by which an oil/water emulsion spray liquid can be supplied to the header tank, heating means associated with the header tank for heating spray liquid therewithin, and a plurality of spray nozzles connected to the header tank for selectively discharging heated spray liquid from the header tank towards the mill rolls and is characterised in that there are additionally means and connections for supplying steam under pressure to the header tank, during periods when spray liquid is not being supplied to the rolls for clearing any obstructed nozzle.
  • the steam supplied under pressure is effective in removing from any obstructed nozzle any oil-based accretion.
  • the heating means for heating spray liquid may include an immersion tube within the tank for the passage of a heating medium, such as steam.
  • a heating medium such as steam.
  • Steam directed to the header tank and through the nozzles may be employed to preheat the rolls and/or to camber the roll or rolls thermally.
  • the invention includes a rolling mill installation comprising a rolling mill having at least two rolls forming therebetween a roll gap, and a plurality of spray units as set out above mounted with their nozzles directed towards the roll gap, and means for supplying heated lubricant spray liquid to each of those spray units.
  • the rolling mill stand is represented by work rolls 12 and back-up rolls 13.
  • Four spray units 14 are mounted on the two sides of the stand and above and below the strip 15 to direct emulsion into the roll gap. Each spray unit extends over the full barrel length of the work rolls as shown in Figure 2.
  • Each spray unit 14 consists of a header tank 16 ( Figures 3 and 4) carrying a linear array of spray nozzles 17 pointed into the roll gap and communicating with the header tank interior through individual control valves 18 which are remotely controlled. Emulsion is pumped from a heated reservoir 19 through an isolating valve 20 to an input port 21 at one end of the header tank and is directed through nozzles 17 at the rolls 12 and strip 15.
  • a steam heating element in the form of a U-shaped pipe 22 is mounted in the other end of the header tank 16 and extends as shown through the header tank interior.
  • the heating element is connected with a supply of steam 23 through a control valve 24.
  • steam is passed through the pipe 22 to maintain the liquid within the header tank at a temperature above the setting temperature of the oil phase of the emulsion and thereby to prevent solid fatty particles separating out and causing blocking of the nozzles 17 and valves 18.
  • the flow of emulsion to the header tank is controlled by valve 20 and may be on or off as required during rolling.
  • header tank 16 and nozzles 17 may be cleaned out by opening the valves 18 and introducing steam from the supply 23 through a second steam valve 25 and an auxiliary inlet duct 26 into the header tank interior.
  • Steam may also be introduced through duct 26 and discharged through nozzles 17 in order to preheat the rolls prior to rolling. Also, when the header tanks are not in use for spraying coolant, steam may be directed by nozzles 17 at the rolls during rolling so that, by selective operation of the valves 18, the temperature of the rolls 12 can be varied along their lengths in order to control strip shape by thermal cambering of the roils.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Nozzles (AREA)
  • Beans For Foods Or Fodder (AREA)
  • Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
  • Control Of Metal Rolling (AREA)

Abstract

A rolling mill has a number of spray units (14) for spraying lubricant liquid on to the rolls (12, 13) and the work (15) being rolled. Each unit consists of a header tank (16) carrying and communicating with an array of spray nozzles (17). In addition to being supplied with heated lubricant liquid, the header tank (16) is supplied with steam via 26 in order that any blocked nozzle (17) may be cleared. The header tank (16) also has mounted therein a steam heating pipe (22) which serves to keep contained lubricant liquid at elevated temperature should the tank be temporarily isolated from the liquid supply.

Description

  • This invention relates to a spray unit for discharging liquid at a rolling mill and for cooling or heating, and lubricating the rolls and material being rolled. The invention also relates to a rolling mill, particularly for rolling metal, having one or more such spray units.
  • When producing tin plate gauges, an olvwater emulsion is used. The emulsion is relatively unstable, the oil phase having a high fat content and a high setting temperature. If allowed to cool, the emulsion thus tends to separate into its component water and oil phases. It is thus necessary to ensure that the lubricating emulsion is suitably heated during delivery. For example, it has been proposed to atomize such a lubricant with steam during delivery (GB-A-1,433,490). However, such atomization is not always desirable and, as will be described below, there are other problems associated with the use of an oil/water emulsion of high setting temperature which such techniques do not solve.
  • In order to camber the rolls thermally to control the strip shape, the temperature across a roll or rolls is varied by having a series of spray nozzles spaced along the roll barrel and selectively controlling the nozzles by isolating valves between the nozzles and a header tank from which the nozzles are supplied. The emulsion is circulated from a heated storage reservoir to the spray header tank or tanks at the mill stand and returned via the mill sump back to the reservoir. In systems (DE-­A-­2-,0,63,878 and US-A-3,523,437) where an oil/air mixture or oil is used, it is known to heat the lubricant by means of a heating medium, usually steam, passing through conduits adjacent lubricant carrying conduits or conventionally known steam traced pipework. However, in the previously described arrangement when strip is not being passed through the mill, the emulsion supply from the reservoir is isolated from the header tank or tanks and the emulsion remaining in each header tank loses temperature and separates into its component phases. There is then a danger that the valves of the spray nozzles may become inoperable due to build-up of fatty oil. This problem has not been avoided by previous proposals, indeed US-A-3,523,437 describes the use of an all oil lubricant of in preference tc an oil/water emulsion because of the problems associated with the use of such an emulsion.
  • In the present invention, the header tank is provided with means enabling the spray-nozzles to be cleared should they become obstructed.
  • Thus, the present invention relates to a spray unit for a rolling mill comprising a header tank which is adapted to be mounted adjacent the mill rolls and which has connection means by which an oil/water emulsion spray liquid can be supplied to the header tank, heating means associated with the header tank for heating spray liquid therewithin, and a plurality of spray nozzles connected to the header tank for selectively discharging heated spray liquid from the header tank towards the mill rolls and is characterised in that there are additionally means and connections for supplying steam under pressure to the header tank, during periods when spray liquid is not being supplied to the rolls for clearing any obstructed nozzle. The steam supplied under pressure is effective in removing from any obstructed nozzle any oil-based accretion.
  • Advantageously the heating means for heating spray liquid may include an immersion tube within the tank for the passage of a heating medium, such as steam. By the use of the heating means, emulsion within the header tank may be kept at a temperature above that at which separation of the oil phase occurs.
  • Steam directed to the header tank and through the nozzles may be employed to preheat the rolls and/or to camber the roll or rolls thermally.
  • The invention includes a rolling mill installation comprising a rolling mill having at least two rolls forming therebetween a roll gap, and a plurality of spray units as set out above mounted with their nozzles directed towards the roll gap, and means for supplying heated lubricant spray liquid to each of those spray units.
  • The invention will be more readily understood by way of example from the following description of a roll mill spray unit in accordance therewith, reference being made to the accompanying drawing, in which
    • Figures 1 and 2 show a rolling mill stand diagrammatically in end view and side view respectively, and.
    • Figures 3 and 4 are respectively a vertical section through a spray unit and a section on the line IV-IV of Figure 3.
  • In Figures 1 and 2, the rolling mill stand is represented by work rolls 12 and back-up rolls 13. Four spray units 14 are mounted on the two sides of the stand and above and below the strip 15 to direct emulsion into the roll gap. Each spray unit extends over the full barrel length of the work rolls as shown in Figure 2.
  • Each spray unit 14 consists of a header tank 16 (Figures 3 and 4) carrying a linear array of spray nozzles 17 pointed into the roll gap and communicating with the header tank interior through individual control valves 18 which are remotely controlled. Emulsion is pumped from a heated reservoir 19 through an isolating valve 20 to an input port 21 at one end of the header tank and is directed through nozzles 17 at the rolls 12 and strip 15.
  • A steam heating element in the form of a U-shaped pipe 22 is mounted in the other end of the header tank 16 and extends as shown through the header tank interior. The heating element is connected with a supply of steam 23 through a control valve 24. During rolling and between rolling operations, steam is passed through the pipe 22 to maintain the liquid within the header tank at a temperature above the setting temperature of the oil phase of the emulsion and thereby to prevent solid fatty particles separating out and causing blocking of the nozzles 17 and valves 18. The flow of emulsion to the header tank is controlled by valve 20 and may be on or off as required during rolling.
  • When rolling is discontinued the header tank 16 and nozzles 17 may be cleaned out by opening the valves 18 and introducing steam from the supply 23 through a second steam valve 25 and an auxiliary inlet duct 26 into the header tank interior.
  • Steam may also be introduced through duct 26 and discharged through nozzles 17 in order to preheat the rolls prior to rolling. Also, when the header tanks are not in use for spraying coolant, steam may be directed by nozzles 17 at the rolls during rolling so that, by selective operation of the valves 18, the temperature of the rolls 12 can be varied along their lengths in order to control strip shape by thermal cambering of the roils.

Claims (3)

1. A spray unit (14), for a rolling mill comprising a header tank (16) which is adapted to be mounted adjacent the mill rolls (12) and which has connection means by which an oil/water emulsion spray liquid can be supplied to the header tank (16), heating means (22-24) associated with the header tank (16) for heating spray liquid therewithin, and a plurality of spray nozzles (17) connected to the header tank (16) for selectively discharging heated spray liquid from the header tank (16) towards the mill rolls (12), characterized in that there are additionally means and connections (23, 25, 26) for supplying steam under pressure to the header tank (16), during periods when spray liquid is not being supplied to the rolls (12), for clearing any obstructed nozzle (17).
2. A spray unit according to claim 1, characterised in that the heating means (22-24) include an immersion tube (22) within the tank for the passage of a heating medium.
3. A rolling mill installation comprising a rolling mill having at least two rolls (12) forming therebetween a roll gap, and a plurality of spray units (14) according to either claim 1 or 2, mounted with their nozzles (17) directed towards the roll gap, and means for supplying heated lubricant spray liquid to each of those spray units (14).
EP80302094A 1979-06-27 1980-06-20 Spray unit Expired EP0021812B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80302094T ATE3616T1 (en) 1979-06-27 1980-06-20 NOZZLE ARRANGEMENT ON ROLLING STANDS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB7922327 1979-06-27
GB7922327 1979-06-27

Publications (2)

Publication Number Publication Date
EP0021812A1 EP0021812A1 (en) 1981-01-07
EP0021812B1 true EP0021812B1 (en) 1983-06-01

Family

ID=10506123

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80302094A Expired EP0021812B1 (en) 1979-06-27 1980-06-20 Spray unit

Country Status (4)

Country Link
EP (1) EP0021812B1 (en)
JP (1) JPS5651256A (en)
AT (1) ATE3616T1 (en)
DE (1) DE3063598D1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104096712B (en) * 2013-04-12 2016-01-13 张家港浦项不锈钢有限公司 The using method of high-speed steel roll on steekle mill
EP2808087B1 (en) 2013-05-28 2019-02-27 Valmet Technologies, Inc. Device for treating a fibre web

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE191709C (en) * 1900-01-01
US3373762A (en) * 1965-10-15 1968-03-19 Gen Motors Corp Multiple fluid delivery system with liquid and gas purging means
US3523437A (en) * 1967-12-07 1970-08-11 United States Steel Corp Method of cold reducing
DE2063878A1 (en) * 1970-12-24 1972-08-31 Schmid, Rudolf Josef, 2800 Bremen Roll stand sprayer - using several nozzle units mounted on a common support to spray steam-heated air/oil mixture
GB1336997A (en) * 1971-06-18 1973-11-14 Fisons Ltd Spray nozzle
GB1433490A (en) * 1973-12-11 1976-04-28 British Steel Corp Application of lubricant to the rolls of a rolling mill
BE851381A (en) * 1977-02-11 1977-05-31 Centre Rech Metallurgique IMPROVEMENTS TO COOLING DEVICES FOR METAL LAMINATED PRODUCTS

Also Published As

Publication number Publication date
JPS5651256A (en) 1981-05-08
EP0021812A1 (en) 1981-01-07
ATE3616T1 (en) 1983-06-15
DE3063598D1 (en) 1983-07-07

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