DD211292A1 - APPENDIX FOR CONTROLLED COOLING OF HOT-ROLLED STEEL WIRE - Google Patents

Abstract

The invention relates to a system as part of a wire rolling mill for the controlled cooling of auszubaechertem in coils hot-rolled steel wire, in the d. Material controlled cooled uniformly to achieve a relatively soft u. ductile microstructure of the Gefueges. D. known systems for the controlled cooling of hot steel wire need Umsetzungszeiten for conversion to different Abkuehltechnologien considerable Umruestzeiten in which the equipment can not be operated. The aim and the object of the invention is that, when switching to another Abkuehltechnologie factually no Umruestzeiten incurred. According to the invention, the object is achieved by arranging, below a known conveying device, on which the flattened turns of wire are subjected to accelerated cooling, a cooling chamber formed as a tunnel 10 with a conveyor 19 located on the tunnel sole. This makes it possible to carry out the slow cooling in the form of closed rings and the accelerated Abkuehlung in the form of flattened wire turns.

Description

for controlled cooling of hot rolled a wire rod

The invention relates to; an installation for the controlled cooling j hot-rolled Sbahldraht _s particular wire of low-alloy and low-carbon steels "They are used in wire rolling mills, in which controlled the material is uniformly cooled to ungsprozesse for subsequent Vi / ei fc erver work, such as Pulling or upsetting to achieve a relatively soft and ductile microstructure of the G-efuge.

In DS-CS 25 46 589 a method and apparatus for controlled cooling of hot rolled. Sfcahldrahb described, • belong to the following individual steps?

- 5as Jarmv / alzen of the wire; depositing the wire on a moving conveyor belt immediately after leaving the wire rolling mill, in non-concentric turns; and finally, the selective control and regulation of the loss of jamming in the beam by supplying radiant heat, essentially inversely to the accumulated mass of this wire, across the sides of the warm branches.

The plant for carrying out these Varfahrensschritte consists essentially of a cooling chamber, also referred to as a continuous furnace through which a conveyor leads, with which the wire in the form of fanned wire windings can be transported through this cooling chamber, said cooling chamber in the longitudinal direction across the entire Breite'mit; burning gas-fired

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Radiant heaters is equipped »radiant heat radiated by this radiant heat pipes differentiated to the wire. The Föräergeschwindigkeife is kept very small in order to achieve a low Abkühlungsgeschwindigib «This causes the turns are very close together, which in turn is very slowly dissipates the heat contained in the material * If the Abkühlungsgeschwindigib be greater, there are except the measures of omission of additional heat and or by increasing the conveying speed nor the possibility of removing the upper cover of the cooling furnace.

By supplying cooling air after the. Sbelmor principle is also the possibility; given a quick cooling. Through all these measures it is feasible ₉ cooling rates depending on the nature and the requirements of the wire between

15. 0 ° C / sec and 20 ° G / s to vary.

Bine system of similar design with an additional gate direction to remove the resulting scale is described in the DB-OS 25 49 501 * After formation of the desired microstructure fall the turns in a arranged at the end of Transporbbandes SammeIschacht and on an underlying Saume! Thorn »Der Disadvantage of this method is that with these systems only after a time-consuming change the different cooling process feasible siridö So it is economically unfavorable that in the transition from the fast to the slow cooling once these so-called cooling furnace are preheated »To achieve the desired Temperature to achieve the Abkühlgeschwindigibib the rolling line can not be operated. The time required for preheating is pure loss time and reduces the productivity of the wire rolling mill *

Furthermore, it can be seen that at slow speed conveyor the turns are very close to each other, which in turn leads to difficulties in collecting the wire turns to the ring. The turns can not be sufficiently pulled apart even with faster-running discharge conveyor, so that the turns more like a diagonal ring in the

Sammelschachb or fall on the Born © This is how it comes fromb corn. Disconnecting the vein or © while bending the hinges to technological disturbances®

The aim of the invention isb ₉ by reducing the loss times the productivity of the plant , increased © n® ^:

The object of the invention is _f dia plant so too. gesbalfeen ₉ that in the case of Uias charging from accelerated cooling to delayed cooling, in fact, no more "Urarustine bushes"

Erfindungsgamäß the object is achieved in that below .. a known conveyor device, on which the fanned Dranfcwindungen an accelerated ti en cooling are subjected, designed as a tunnel cooling chamber arranged with a conveyor located on the tunnel bottom isfe © ¹ In the all-round insulated tunnel "The cooling of the wire must be done in a closed ring." For the purpose of the ring-sawing on pallets, the input and output of the pallets: receiving lifting and lowering device is "above the stroke-side lifting" and lowering device is a minimum of one roller securement connected SammeIschacht provided which can be inserted into the upper conveyor optionally _e

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Based on a Aasführungsbeispieles the invention will be explained in more detail »

1, the top view of a wire-wrapping machine,

Fig »2 a Schnitife according to the Schnifefeführung of Figure" ¹ ^ ₉

The plant consists essentially of the known Lufbabkühlstrecke with the underlying Lufbkanmiern. and'a tunnel 10 arranged below this transport plane '

The tunnel 10 is insulated on all sides and in. Reason equipped with a conveyor 19 © gate and behind the. Tunnel 10 is in each case arranged a lifting and lowering device 8 and 14 · Input "" and the output side of the tunnel 10, a door 11 and 12 is provided », The lifting and lowering device 8 is located immediately after the" indungsleger 2 and is technologically combined with one in the-Sbelmorlinie a "and extendable Sammelschachfc 4 ₉ the collection tray 4 is also connected to a roller section 18 · the emerging from the WaIzblock steel wire reaches according to a water cooling via the! driver. 1 the laying head 2 of the steel wire in fanned windings is placed on a short conveyor belt 3, which transports the windings in the SamiaeIacht 4. The collection shaft 4 is inserted by a corresponding device in the upper transport line inside the SaiMie! shaft 4 is the collecting mandrel 5s aer part of the pallet 6 isb, on the pallet 6 is picked up by means of a fork 7 from the lifting and lowering device 8 The tunnel 10 below the normal transport line picks up the loaded pallets 6. The transport of the pallets 6 through the tunnel 10 is carried out by a conveyor 19® provided on the input and output side of the tunnel 10 doors 11, 12 and the insulation 13, that in the interior of the tunnel the heat loss is very low »The located on the Saiaoielüorn 5 ring still has a temperature which is above the microstructure transformation temperature for the respective material. By appropriate preheating of the tunnel 10 by known means and by the presence of several rings prevails in this closed space an approximately constant high temperature »This makes it possible that the structure of the steel wire isdtherioisch can convert. After leaving the tunnel 10, the pallet 6 enters the room with the ring _? in which by: correspondingly arranged fan ducts 16 of the ring on loading temperature is cooled »To raise the pallet 6 with the ring on the normal finishing plane ^ a pivotable roller section 15 is folded down and thus the space for lifting the pallet 6 released.

The lifting takes place by means of the lifting and lowering device 14 »A telescopic tube 17 arranged underneath the lifting and lowering device 14 can be introduced from below into the pallet 6, in the case of a fresh air, injection into the telescopic tube

 05 17 an increased annular cooling of the interior is possible, "After the compression and setting of the ring, the return transport of the pallets takes place via a circulating system of roller tables 9o When the system is heated to produce accelerated cooling wire, the collecting shaft 4 becomes aa The steel wire can thus be transported over the normal transport line and subjected to an accelerated cooling without loss times. "If, in turn, a delayed cooling is to be carried out in accordance with the production program, then ^ After the required temperature level has been reached, the collecting shaft 4 is retracted and the loaded pallets 6 are conveyed through the tunnel 10 "according to the accumulation of mass through the tunnel Variety of rings located in the tunnel 10, the supply of additional energy can be throttled or «according to the required Abkühlgeschohgeschwindigkeit completely eliminated«

Claims (1)

β - 1 «System for the controlled cooling of hot-rolled. Steel wire, with; a laying and transporting device for receiving the steel wire in the form of fanned wire coils which are subjected to accelerated cooling © n ₉ & ekennaeiohnet dadUT ₁ ch ₀ that below the aforementioned transport means a cooling chamber formed as a tunnel (10) with a conveyor located on the tunnel sole (19 ) is arranged. 2 _a system according to point 1, characterized in that tunneleingangs- and - ?. "au.sgangsseifeig a Palebten (6) receiving lifting and lowering device (8, 14) is arranged, 3 "system according to item 1 and 2, characterized in that axially aligned above the lifting and lowering device (8) a. with a roller section (18) connected collecting shaft (4) optionally in the upper transport device can be inserted » 4 _S system according to items 1 to 3, characterized in that the tunnel (10) is provided with a respective door (11, 12) on the input and output side 5 «attachment to point; 1 to 4, characterized in that the lifting and lowering device (14) with a Lüftteinblassystem is provided ': - For this 2 sheets drawings -