EP0383786A1 - Device for producing a water curtain. - Google Patents
Device for producing a water curtain.Info
- Publication number
- EP0383786A1 EP0383786A1 EP88908673A EP88908673A EP0383786A1 EP 0383786 A1 EP0383786 A1 EP 0383786A1 EP 88908673 A EP88908673 A EP 88908673A EP 88908673 A EP88908673 A EP 88908673A EP 0383786 A1 EP0383786 A1 EP 0383786A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- water
- slot
- water curtain
- curtain
- boxes
- 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.)
- Granted
Links
Classifications
-
- 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
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
- B05C5/005—Curtain coaters
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
- C21D9/085—Cooling or quenching
Definitions
- the invention relates to a device for generating a water curtain according to the preamble of patent claim 1.
- Laminar water curtains are created in order to specifically cool the rolling stock. These can be strips, sheets, slabs as well as pipes. As a rule, cooling must take place evenly. For this reason, the goods to be cooled must be aligned with the water curtains.
- Flat bodies are generally transported transversely to the water curtains and through them via roller tables, while rotationally symmetrical bodies are cooled under the water curtains, the axis of rotation being aligned parallel to the line of impingement of the water on the rolling stock and preferably being located vertically below it.
- a major difficulty in the production of a laminar water curtain is to produce a uniform thickness over the entire width of the water curtain, ie to ensure the same water supply at all points in the impact zone on the rolling stock to be cooled. Because of the large required width (max. 5 m for flat rolling stock, 15 - 30 m for pipes) of the water curtain, irregularities in the laminar flow in the form of constrictions can occur, which can even tear the water curtain at individual points.
- the object of the invention is to develop a device according to the preamble of claim 1 to the extent that these disadvantages are avoided as far as possible.
- the invention is based on dividing a water box device going over the required water curtain width into several mutually independent modules, i.e. into individual water boxes with their own water supply and their own water outlet opening, the individually produced water curtains of which in turn are to be combined to form a total water curtain.
- the device according to the invention ensures a safe formation of the laminar flow in the outlet nozzle, since the water already reaches the entry zone of the wide slot guide in a calming manner through a siphon-like overflow that extends over the entire width of each individual water box. This largely eliminates the negative effects of turbulence when the water enters from the adjustable feed line into the water tank.
- the invention avoids "bone formation" in the impact zone of the water curtain on the rolling stock.
- the confluence of adjacent sections of the water curtain compared to the normal width of the impact zone (thickness of the water curtain) results in a central area with too little water supply, on each side of which there is an area with a too large one Water supply connects.
- This problem is solved according to the invention by providing a further targeted physical guidance of the water curtains in their edge regions after the flow through the slot slot guide in order to equalize the flow and controlled "fusion" of the edges. This is realized in that the individual water boxes are arranged at a distance from one another, so that the partition between two immediately adjacent water boxes is no longer designed as a common partition wall but as individual walls.
- Turbulent flows in the area of the interface between adjacent sections of the water curtain can largely be converted into a laminar flow inside the outlet nozzle.
- FIG. 1 shows a water box arrangement according to the invention in longitudinal section
- FIG. 2 shows a cross section through the water tank arrangement according to line A-A in FIG. 1,
- FIG. 3 shows a cross section through the water tank arrangement along line BB in FIG. 1
- FIG. 4 shows a sheet metal strip for reducing the flow range, in a view and a top view
- FIG. 5 hardness measurements on two test pieces depending on and 6 the distance of the measuring point from the interface of the water curtain sections
- FIG. 1 shows in longitudinal section a division into three spaced-apart water boxes 1, each of which is connected to a separately controllable water supply line 2.
- this device is shown in cross section along the line A-A and in Figure 3 in cross section along the line B-B.
- the water flows in laminar form through a slot slot 3 from the water tank 1 in free fall downwards.
- This is assisted by the siphon-like overflow device, which is formed by the sheets 10 and 11 extending vertically from the cover or the bottom of the water box 1 into the liquid level and extending over the entire width of the water box 1.
- the sheet 11 forms together with the boundary wall 6 the slot guide 3, which has the same clear width over the entire width of the water tank 1.
- the edges of the three sections of the water curtain produced by the outflowing water are brought together by the guide webs 4, each of which laterally adjoins the wall 5 delimiting the narrow side of the slot guides 3 downwards.
- adjacent guide webs 4 are each inclined to one another and connected to one another at their ends to form a conical taper.
- the side walls 6 of all water boxes 1, like the metal sheets 11, are extended below the water boxes 1 and guide the slot guides 3 into a common outlet nozzle 7 for all water boxes 1.
- the exit plane of the outlet nozzle 7 is designated by the reference numeral 6 and lies clearly below the conical tapering formed by the guide webs 4, so that a zone for flow calming is formed below this up to the exit plane 8.
- the clear width of the outlet nozzle 7 has been reduced locally in each case by a sheet metal strip 9, which is fastened to the inside of the sheet 11, in order to ensure that the water supply in the seams is achieved via the guide webs 4 Limit reduction beyond.
- a sheet metal strip 9 which is fastened to the inside of the sheet 11, in order to ensure that the water supply in the seams is achieved via the guide webs 4 Limit reduction beyond.
- FIG. 5 and FIG. 6 the results of hardness measurements on two steel tubes made of the material 29 CrMo 4 4 or 20 CrMo 4 4 treated according to the invention are shown graphically as a function of the distance of the measuring point from the interface of two sections of a water curtain.
- the hardness values on the inner and outer surface and in the middle of the pipe wall were determined.
- the course of these hardness values shows neither an increased nor a reduced cooling effect in the area of the interface.
- the absolute level of the individual values and their fluctuation range correspond entirely to the course that can be achieved in the best case with planned cooling.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
- Financial Or Insurance-Related Operations Such As Payment And Settlement (AREA)
- Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
- Nozzles (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT88908673T ATE75639T1 (en) | 1987-10-22 | 1988-10-12 | DEVICE FOR CREATING A WATER CURTAIN. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3736021 | 1987-10-22 | ||
DE3736021 | 1987-10-22 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0383786A1 true EP0383786A1 (en) | 1990-08-29 |
EP0383786B1 EP0383786B1 (en) | 1992-05-06 |
Family
ID=6338990
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP88908673A Expired - Lifetime EP0383786B1 (en) | 1987-10-22 | 1988-10-12 | Device for producing a water curtain |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0383786B1 (en) |
CN (1) | CN1034497A (en) |
AT (1) | ATE75639T1 (en) |
DE (1) | DE3870886D1 (en) |
WO (1) | WO1989003729A1 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3914218C2 (en) * | 1989-04-27 | 1994-08-18 | Mannesmann Ag | Method and apparatus for quenching an elongated metallic cylindrical body |
DE3937626C1 (en) * | 1989-11-09 | 1991-01-31 | Mannesmann Ag, 4000 Duesseldorf, De | |
DE4335710C2 (en) * | 1993-10-20 | 1996-11-21 | Eko Stahl Gmbh | Device for differentiated cooling of wide flat products |
DE4337342A1 (en) * | 1993-11-02 | 1995-05-04 | Schloemann Siemag Ag | Device for cooling rolled strips |
EP3659436A1 (en) | 2018-11-30 | 2020-06-03 | Bayer AG | Control of plants by means of electrical power |
CN113845177B (en) * | 2021-10-19 | 2023-01-17 | 太原科技大学 | Purifier based on amorphous magnetically soft alloy |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1595312A (en) * | 1977-02-07 | 1981-08-12 | Davy Loewy Ltd | Cooling apparatus |
GB2035526B (en) * | 1978-10-02 | 1983-08-17 | Centre Rech Metallurgique | Cooling of rolled metal products |
DE3334251C2 (en) * | 1983-09-22 | 1986-04-10 | Mannesmann AG, 4000 Düsseldorf | Device for generating a water curtain for cooling sheet metal and strips |
IT1177873B (en) * | 1984-07-04 | 1987-08-26 | Centro Speriment Metallurg | DEVICE FOR COOLING HOT ROLLED FLATS |
-
1988
- 1988-10-12 DE DE8888908673T patent/DE3870886D1/en not_active Expired - Fee Related
- 1988-10-12 WO PCT/DE1988/000642 patent/WO1989003729A1/en active IP Right Grant
- 1988-10-12 AT AT88908673T patent/ATE75639T1/en not_active IP Right Cessation
- 1988-10-12 EP EP88908673A patent/EP0383786B1/en not_active Expired - Lifetime
- 1988-10-22 CN CN88107297.4A patent/CN1034497A/en active Pending
Non-Patent Citations (1)
Title |
---|
See references of WO8903729A1 * |
Also Published As
Publication number | Publication date |
---|---|
ATE75639T1 (en) | 1992-05-15 |
DE3870886D1 (en) | 1992-06-11 |
WO1989003729A1 (en) | 1989-05-05 |
CN1034497A (en) | 1989-08-09 |
EP0383786B1 (en) | 1992-05-06 |
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