FR2507930A1 - DEVICE FOR COOLING SPIRITS OF STEEL WIRES IN HOT ROLLED - Google Patents

Abstract

DEVICE FOR THE ACCELERATED COOLING OF STEEL WIRE COILS IN THE HOT ROLLED. THE DEVICE IS OF THE TYPE WHICH INCLUDES A SERIES OF BOXES 1 OF WHICH THE UPPER WALL 2 PRESENTS OPENINGS 3, 4 AND 5, CALLED "GATES", THROUGH WHICH AIR IS BLOWED ON THE WIRE COILS 6 WHICH MOVE ABOVE THE UPPER WALL 2, THE DOWNSTREAM PART WITH RESPECT TO THE DIRECTION OF MOVEMENT OF THE COILS 6 OF EACH OF THE SAID HOLES BEING EQUIPPED WITH A PLATE, CALLED "WING", WHICH IS INCLINED TOWARDS THE INSIDE OF BOX 1 AND TOWARDS THE UPSTREAM PART OF THE HARNESS. THE DEVICE IS CHARACTERIZED IN THAT, AT LEAST FOR CERTAIN OF THE GATES, THE ANGLE OF TILT OF THE WING IN RELATION TO THE UPPER WALL 2 OF THE BOX 1 IS LESS THAN 20 AND THE SAID WING IS EXTENDED BY A PLATE, CALLED " AILERON ", WHICH IS PARALLEL TO THE UPPER WALL 2 OF BOX 1, SO AS TO DELIMIT A PASSAGE OF BLOW AIR.

Description

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  DEVICE FOR COOLING SPIERS

  OF STEEL WIRES IN THE ROLLING HOT

  The present invention relates to cooling turns of steel wire in the hot rolling.

  It is known that in order to give steel wires

  mined, they undergo a heat treatment, said patenting, direct-

  In a more precise way, this treatment consists of cooling the wires, at the exit of the finishing cages, by watering water from a temperature of about 1500 ° C. to a temperature of 650 ° C. at 8000 C The wires are then put in the form of turns

  that is then sent to a cooling device.

  Some coil cooling devices currently used

  have a conveyor on which the turns move and are cooled

  dies by blowing air, so that the transformation has

  steel occurs at a certain speed.

  However, when cooling the turns in

  this type, a sharp recalescence of steel due to

  thalpy of transformation y - + a, which slows down the cooling rate

  In order to solve this problem, it has been proposed to inject water onto the turns of wires during cooling. However, the water drops formed produce a non-homogeneous cooling of the turns. which affects their mechanical properties. The object of the present invention is precisely to solve the problem described above. More particularly, the object of the invention is to provide a device for improving efficiency and homogeneity.

  cooling of turns of steel wires.

  For this purpose, the subject of the invention is a device for cooling

  accelerated turns of steel wire in the hot rolling, of the type of those which comprise a series of boxes whose upper wall

  has lateral and central openings, called "gills", through which

  the air is blown on the turns of wires that move above the upper wall of the boxes, the downstream portion relative to the direction of movement of the turns of each of said openings being provided with a plate, called "wing", which is inclined towards the inside of the casing and towards the upstream part of the ear According to the invention, the device is characterized in that, at least for some or five, the angle of inclination of the wing relative to the upper wall of the box is less than 200 and said wing

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  is extended by a plate, called "fin", which is parallel to the wall

  upper chamber to better channel the air blown.

  According to one embodiment, the wing is a rectangular plate of which

  the sides are provided with vertical edges.

  According to a preferred embodiment, for the central openings, the wing is a plate which has the shape of a trapezium whose large base corresponds to the downstream part of the hearing and whose sides, provided with vertical flanges. , make an angle of 600 to 85 e with the downstream part of the oule For the side gills, the wing is a plate which has the shape of a rectangle trapezium whose large base corresponds to the downstream part of the oule and whose sides are provided with vertical edges, the side located towards the central part of the box making an angle of 60 to 85 with the downstream part of the hearing. According to one embodiment of the invention, a water nozzle is placed at the outlet of the passage defined between the fin and the upper wall of the box, said nozzle being oriented so that the water jet is

parallel to the wing.

  According to a variant of the invention, the water is injected in the form of steam. As can be understood, the configuration of oules of the device according to the invention allows a more homogeneous continuous cooling Indeed, the blown air circulates at high speed along the bed of the turns of son It should be noted that the air blown by the passage delimited between the upper wall and the fin allows a turbulent flow plated at its

  outlet of the hearing against the upper wall, which allows a cooling

very effective.

  When water is injected through the jet that is placed in the hearing,

  this water mixes with the blown air, which turns it into fog.

  The injection of water in the form of steam leads to a finer mist and

  thus allows a more homogeneous cooling of wire turns.

  The configuration of the gills according to the invention is only necessary in the cooling zones where there is a risk of recalescence of the wires

in steel.

  The invention will be well understood and other aspects and advantages

  more clearly in light of the following description, given as a

  purely illustrative and with reference to the accompanying drawings in which Figure I shows a top view of a portion of the device for cooling wire turns; FIG. 2 represents a sectional view, along line Y Y of FIG.

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  Figure 1, an embodiment of a hearing according to the invention.

  As is known, the cooling device is located after the finishing cages and a winding head (not shown in the figures) placed in series The device comprises a series of ventilation boxes 1 whose upper wall 2 has openings say

  "ears", namely, two lateral series of blanks 3 and 4 and a central series

  The turns of the steel wires 6 move in the direction A

  thanks to chains 7 and 7 'which are mounted above the upper wall.

  Re 2 of the box As shown in Figure 2, each box 1 is provided with a fan 8-in order to blow the air through the 3, 4 and 5 on the turns 6 It is obvious that each box 1 has several or 3, 4 and 5 on its upper wall 2, although Figure 2 shows only one

  5 to simplify the explanations.

  In the embodiment shown in FIGS. 1 and 2, the plate 9 has the shape of a trapezium for the central ores 5, and the shape

  of a rectangular trapezium for the lateral openings 3 and 4 This configuration

  preferred ration allows a better cooling portions of turns 6 at the chains 7 and 7 ': in fact, the air arrives through the passage 11, delimited between the fin 10 and the upper wall 2 of the box; it then circulates on the inclined plate 9 and, thanks to the particular geometry of

  this plate 9 is oriented towards the chains 7 and 7 '.

  In the device according to the invention, the angle of inclination of the wing 9 is less than 200 and, preferably, about 10 The plate 10 of rectangular shape called "fin", which is parallel to the upper wall 2 so as to delimit the passage of the blown air 11, can be fixed to

  the wing 9 by appropriate means, for example by welding.

  The nozzle 12 is placed at the outlet of the passage 11, that is to say in the vicinity of the end of the fin 10 adjacent to the wing 9 The nozzle 12 is connected to a tube 13 which passes through the fin and which is itself connected to a water pipe 14 The nozzle 12 is preferably

  flat jet type It is oriented so that the water jet is

leash to wing 9.

  The water is preferably injected in the form of steam In this case, the injected vapor is cooled by the blown air and converted into a very fine mist, which is preferable for cooling

  fast and homogeneous wire turns 6.

  FIG. 2 shows a compact water-air compressed ramp placed above the bed of wire turns 6. The compact ramp 15 is supplied with water by a tube 16 and by air through a tube 17.

  this compact ramp 15 independently or simultaneously with the nozzle 12.

  The operation of the device according to the invention is as follows.

  As is known, after the finishing block, the steel wires are cooled with water to a temperature of 650 to 800 ° C and put in turns by means of a winding head (not shown in FIG. figures). The thread turns 6 thus formed are then displaced by the chains

  7 and 7 'on the upper walls 2 of the caissons 1.

  Moreover, air is sucked into the casing 1 and flows into the passage 11 Thus the air flow through the oule is better directed, which allows effective cooling The air is then oriented by the flange 9 towards the bed of the turns 6 As the angle of inclination of the flange 9 relative to the upper wall 2 is less than that of the conventional type of devices, the blown air flows on the along the bed of

turns of threads 6.

  When water is injected through the jet jet nozzle 12, this water is mixed with the air blown and thus transformed into mist As the nozzle 12 is placed at the outlet of the passage 11, there is no risk of

  formation of drops of water on the inner face of the upper wall 2.

  As already explained above, water injection in the form of

steam is better.

  It goes without saying that the present invention is not limited to the modes of

particular embodiments described.

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Claims (6)

  1) Device for the accelerated cooling of turns of steel wires (6) in the hot rolling mill, of the type of those comprising a series of boxes (1) whose upper wall (2) has lateral openings (3), (4) and central (5), said "oufes", by which air is blown on the turns of threads (6) which move above the upper wall (2), the downstream portion relative to the direction of movement of the turns of each of said openings being provided with a plate (9), called "wing", which is inclined towards the inside of the box (1) and towards the upstream part of the ear, device characterized in that that, for at least some of the islands, the angle of inclination of the wing (9) relative to the upper wall (2) of the box (1) is less than 200 and said wing (9) is extended by a plate (10) called "fin" which is parallel to the upper wall (2)   of the box (1), so as to define a passage of the blown air (11).   2) Device according to claim 1, characterized in that the wing (9) of the gills is a rectangular plate whose sides are provided with vertical edges.   3) Device according to claim 1, characterized in that the wing (9) central gills (5) is a plate which has the shape of a trapezium whose large base corresponds to the downstream portion of the hearing and of which the sides, provided with vertical edges, make an angle of 60 to 850 with the downstream part of hearing.   4) Device according to one of claims 1 or 3, characterized in that   that the wing (9) of the side plates (3), (4) is a plate which has the shape of a rectangle trapezium whose large base corresponds to the downstream part of the hearing and whose c tees are provided vertical edges, the side towards the central part of the box making an angle of 600 to 850 with the downstream part of the oule.   5) Device according to one of claims 1 to 4, characterized in that   a water nozzle (12) is placed at the outlet of the passage (11) delimited between the fin (10) and the upper wall (2) of the box (1), said nozzle (12) being oriented in a manner that the water jet is parallel to the wing (9).   6) Device according to claim 5, characterized in that the water is injected as a vapor.