GB2178981A - Process and apparatus for producing steel wire for reinforcing concrete - Google Patents
Process and apparatus for producing steel wire for reinforcing concrete Download PDFInfo
- Publication number
- GB2178981A GB2178981A GB08608505A GB8608505A GB2178981A GB 2178981 A GB2178981 A GB 2178981A GB 08608505 A GB08608505 A GB 08608505A GB 8608505 A GB8608505 A GB 8608505A GB 2178981 A GB2178981 A GB 2178981A
- Authority
- GB
- United Kingdom
- Prior art keywords
- wire
- cooling
- water
- rolled
- steel wire
- 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
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 45
- 239000010959 steel Substances 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000008569 process Effects 0.000 title claims abstract description 22
- 230000003014 reinforcing effect Effects 0.000 title abstract 2
- 238000001816 cooling Methods 0.000 claims abstract description 82
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
- 238000005096 rolling process Methods 0.000 claims abstract description 24
- 238000010438 heat treatment Methods 0.000 claims abstract description 14
- 238000009434 installation Methods 0.000 claims abstract description 14
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 12
- 235000019362 perlite Nutrition 0.000 claims abstract description 9
- 239000010451 perlite Substances 0.000 claims abstract description 9
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 5
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 5
- 239000000498 cooling water Substances 0.000 claims description 15
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000011144 upstream manufacturing Methods 0.000 claims description 4
- 230000003068 static effect Effects 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims description 2
- 238000013459 approach Methods 0.000 claims description 2
- 239000010410 layer Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 230000008859 change Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000007669 thermal treatment Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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
- B21B45/0224—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for wire, rods, rounds, bars
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
- B21C47/02—Winding-up or coiling
- B21C47/10—Winding-up or coiling by means of a moving guide
- B21C47/14—Winding-up or coiling by means of a moving guide by means of a rotating guide, e.g. laying the material around a stationary reel or drum
- B21C47/143—Winding-up or coiling by means of a moving guide by means of a rotating guide, e.g. laying the material around a stationary reel or drum the guide being a tube
-
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/08—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires for concrete reinforcement
-
- 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
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/573—Continuous furnaces for strip or wire with cooling
- C21D9/5732—Continuous furnaces for strip or wire with cooling of wires; of rods
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
- B21B1/163—Rolling or cold-forming of concrete reinforcement bars or wire ; Rolls therefor
-
- 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
- B21B2045/0236—Laying heads for overlapping rings on cooling conveyor
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Metal Rolling (AREA)
- Winding, Rewinding, Material Storage Devices (AREA)
Abstract
A process and apparatus uses a wire rolling installation 1, with the rolled wire being subjected to a heat treatment. In order to produce a high-grade steel wire, for use in reinforcing concrete, in coil form with an annealed marginal martensite layer and a core comprising ferrite and perlite, the rolled wire is passed through a water cooling section 2 prior to a first wire drive means 3,with temperature equilibrium between the core and marginal layers being produced in a guide means 4 between the first wire drive means 3 and a second wire drive means 5. Provided downstream of the wire drive means 5 is a turn laying means 6 which is mounted in an inclined position of about 10 DEG and with which the steel wire which has been subjected to heat treatment up to that time and in respect of which the formation of its structure has been concluded is laid down in regular turns. The coiled steel wire passes over a roller bed 7, a conveyor 8 where it is cooled by air cooling means 19, over a roller bed 9, and is finally collected on a mandrel 10. <IMAGE>
Description
SPECIFICATION
Process and apparatus for producing a concrete reinforcing steel wire
The invention relates to a process and apparatus for producing a concrete reinforcing steel wire having high strength properties and good weldability on modern wire rolling installations, wherein the rolled steel, after leaving the last transformation stage, a wire rolling block, is subjected to a heat treatment.
Taking into account the requirements of the users of concrete reinforcing steel wire, namely that the steel is to have good weldability while enjoying high levels of strength, the concrete reinforcing steel, manufactured on high-capacity wire rolling lines, is subjected to a heat treatment so that a marginal layer of tempered martensite is formed and the core portion of the steel has a ferrite-perlite structure.
Thus, German patent specification No. 2 345 738 discloses a steel wire and process for the production thereof, in which the core portion of the steel wire comprises perlite in fine strip form, which is surrounded by a completely annealed or drawn martensite layer which forms the surface of the wire and which, in respect of the wire cross-section, has an area component of a maximum of 33%.The process which uses the rolling heat is such that the steel wire, after leaving the finishing roll unit of the wire rolling line is subjected to a multi-step water cooling operation and, after the subsequent operation of being wound in a coil, is cooled down to ambient temperature in the free air, wherein the steel wire, prior to the multi-step water cooling operation, is brought to a temperature of from 850 to 91 0,C and then cooled down in a multi-step mode by means of water in about 0.2 seconds at its surface, to a temperature below the martensite start temperature.
A further publication, German patent specification
No. 2 900 271, discloses that the concrete steels are ribbed and are produced on a wire rolling line. In this case also, after leaving the finishing unit the rolled material is subjected to intensive cooling with the surface of the rolled material being cooled down to below the martensite start temperature. In that procedure cooling is to be effected at such a level of intensity that the equilibrium temperature between the core portion and the surface is attained before conversion into bainite, ferrite or perlite can begin, and that the equilibrium temperature lies approximately in the temperature range in which the earliest possible conversion of the austenite into ferrite and perlite can occur.After the equilibrium temperature is reached the temperature is maintained substantially constant until the end of conversion of perlite and the rolled material is thereafter subjected to slow cooling. This process is also performed in such a way that after passing through the cooling step, the concrete steel is wound onto suitable devices, on coils, and cooled down in the air, in the coil.
A corresponding apparatus is disclosed in DE-OS
No. 30 29 229.
The disadvantage of the known solutions is that they can only be used for given dimensions, and the rolled material is coiled up, which necessitates additional pieces of equipment and apparatus.
The present invention provides a process for rolling concrete steel wire, under normal operating conditions in a wire rolling line, which process ensures an operating procedure which provides good quality products and which is economically viable and in which the known items of equipment are utilised.
The invention provides a process for producing a high-grade concrete steel in coil form with annealed marginal martensite layer for a diameter range 410 10 mm on modern high capacity wire rolling installations, in which the concrete steel has an elastic limit or yield strength of > 500 MPa, a tensile strength of > MPa and minimum elongation or stretch of 10%.
Another underlying problem of the invention is that of developing a suitable apparatus which carries out the process by virtue of suitable arrangement in the high-capacity wire rolling installation.
According to the present invention in one aspect there is provided a process for the production of a concrete reinforcing steel wire, on high-capacity wire rolling installations, which has good welding properties and which is subjected to a heat treatment whereby a mixed structure of ferrite and perlite is formed in the core cross-section and the surface has a closed annealed martensite layer, in which cooling of the rolled wire is concluded before the wire reaches a first wire drive means, temperature equilibrium is produced between the first and a second wire drive means, and the resulting steel wire thereafter is at a temperature which ensures fault-free formation of turns, the heat treatment and the operation of forming the structure of the concrete steel already being concluded at that time.
The process is carried out on a high-capacity wire rolling installation in such a way that the concrete steel wire, after leaving the wire rolling unit, passes through a cooling section which can be supplied with water and the necessary cooling of the concrete steel is concluded when it has reached and passed through a first wire drive means.
The cooling water passes into the cooling section by way of suitable means and is varied in dependence on the material to be rolled and the rolling speed. The cooling section is supplied with or acted upon by cooling water only after the tip of the rolled wire has passed through the cooling section. After the concrete steel has passed through a first wire drive means, it passes through a guide means in which the necessary temperature equilibrium as between the core portion and the surface layer is effected, wherein a closed annealed marginal martensite layer is formed at the surface of the rolled material and a ferrite-perlite structure occurs in the region of the core crosssection.Thereafter the concrete steel passes into a second wire drive means, and receives the necessary kinetic energy in order thereafter to be laid down on an impingement-type roller bed, in good-quality turns, by means of a turn laying means. The fanned-out concrete steel is then transferred to a turns conveyor, is subjected to further cooling by means of air, and passes by way of a collecting roller bed into a collecting shaft in which the concrete steel is deposited in coils of commerical nature. The further cooling operation using air is matched to the alloy content of the rolled wire so that the y- & conversion occurs practically in the perlite step.
An important consideration in regard to the process according to the invention is that cooling of the concrete steel is terminated prior to a first wire drive means, temperature equilibrium is produced between the first and a second wire drive means and the concrete steel is thereafter at a temperature which ensure fault-free formation of turns thereof in the turn laying means, by means of the rotating laying tube. At that time thermal treatment and formation of the structure of the concrete steel are already terminated.
Another feature of the process according to the invention is that cooling of the concrete steel is effected without an intermediate temperature equilibrium or balancing step and the necessarily rapid cooling effect is achieved by the static pressure in the cooling means which comprises individual successively disposed cooling pipes being increased, insofar as the wiper nozzles which are disposed between the cooling pipes are supplied with pressurised water, the pressure of which corresponds to the feed pressure of the cooling water for the cooling means. The individual wiper or stripping nozzles are arranged at a given spacing from the respective cooling pipe which, from the end of the cooling pipe to the beginning of the nozzles, is approximately twice the inside diameter of the cooling pipes themselves.Fault-free temperature balancing is achieved by the cooling water being removed from the concrete steel by the pressure of water and air, prior to the concrete steel passing into the balancing or equilibrium zone. For that purpose, a water nozzle and an air nozzle are disposed respectively downstream of the last cooling pipe and upstream of the guide means.
According to the present invention in another aspect there is provided apparatus for carrying out the process of the invention, in which a first wire driver and a guide means are provided in the part of the installation for the heat treatment, downstream of a cooling section which is provided with cooling pipes, and a second wire driver is arranged downstream of the guide means, but upstream of a turn laying means which is inclined through 10 .
Disposed between the two wire drive means is the guide means, consisting of a guide channel, which is made up of cast members. The cooling section comprises individual cooling pipes with corresponding installation fitments, wiper or stripping nozzles which are supplied with pressurised water and are provided between the cooling pipes, and a respective water nozzle or air nozzle is arranged upstream of the guide channel.
Another feature of the invention provides that the turn laying means is arranged in an inclined position through about 10 .
Also in accordance with the invention is the particular configuration of the outlet opening of the rotating laying tube in the turn laying means. In that respect, account is taken in particular of the fact that, at different temperatures, different levels of stiffness occur in the cooled concrete steel, and they result in the concrete steel being laid down in a different fashion in the fanning-out operation and in laying down the turns of concrete steel. It was therefore found that the laying tube is bevelled off at its discharge end at a given angle and is provided with a flat guide plate. The angle is approximately 3 to 5" while the dimension c is from 3 to 5 mm.The dimension c in that respect is the spacing of the middle of the laying tube to the guide plate, with respect to the discharge or outlet opening; it will be appreciated that bevelling at both sides is also possible, with guide plates then also being provided at both sides.
The concrete steel which is produced in accordance with that process and on a high-capacity wire rolling installation has been subjected to a suitable heat treatment and has material properties which involve elastic limit values of > 500 MPa, tensile strength values of > 570 MPa and minimum elongation or stretch of 10%. The concrete steel also has good welding properties. A matter of advantage is that, by virtue of the arrangement of two wire drive means, they are so set relative to each other than the concrete steel, between the wire drive means, is subjected to only such a slight tensile force which is sufficient to pull the concrete steel through the guide means, without the danger of buckling thereof, while providing for high-quality laying of turns of concrete steel.
An embodiment of the invention will now be described, by way of an example, with reference to the accompanying drawings, in which:
Figure 1 is a diagrammatic view of the part of the installation for heat treatment of the concrete steel;
Figure 2 is a view in longitudinal section through a part of the cooling section;
Figure 3 is a sectional view of the detail indicated at
A in Figure 2;
Figure 4 is a sectional view of the detail indicated at
B in Figure 2;
Figure 5 is a view of the laying tube fixing of the turn laying means;
Figure 6 is a view in section taken along the line
C-C of Figure 5 in a turned condition; and
Figure 7 is a view in section taken along the line
D-D in Figure 5, in a turned condition.
Figure 1 shows a general view of the heat treatment portion of a high-capacity wire rolling installation for the production of concrete steel. Disposed downstream of the wire rolling block or rolling unit 1 is a cooling section 2 which is followed by the first wire drive means which consists of a wire driver 3, guide means 4 which, as a guide channel, consists of cast members which are put together, and a second wire drive means consisting of a wire driver 5. Disposed downstream the wire driver 5 is a turn laying means 6, which is inclined at an angle of 10 . Further provided is an impingement-type roller bed 7, a turns conveyor 8, a collecting roller bed 9 and, following same, a collecting shaft 11 with collecting mandrel 10. Disposed in the collecting shaft 11 is a cropping shears assembly 12. An air cooling means 19 is disposed beneath the conveyor 8. The concrete steel, referred to hereinafter as rolled wire, which was subjected to finishing rolling in the wire rolling unit 1, passes into the cooling section 2 in which it is cooled in such a way that a marginal martensite layer of fixed thickness is produced. The function of the first wire driver 3 which is disposed downstream of the cooling section 2 is to overcome the braking force which acts on the rolled wire due to the cooling water in the cooling section 2, and to ensure that the rolled wire is conveyed on in a fault-free manner. The wire is passed through the guide means 4 to the second wire driver 5 and to the turn laying means 6.The distance from the end of the cooling section 2 to the turn laying means 6 is such that the time taken for the rolled wire to pass therethrough is sufficient to conclude temperature equilibrium or balancing between the core portion and the marginal region, and thus to terminate the necessary anealing of the marginal martensite layer. That is necessary for the purposes of forming turns in the turn laying means 6 in a fault-free manner, so that the rolled wire has minimum resistance to deformation.
The movement of the rolled wire through the rotating laying tube 22 of the turn laying means is produced substantially by the second wire driver 5. The turn laying means 6 continuously deposits the rolled wire in individual turns on a moving impingement-type roller bed 7, and the wire is transferred on to the conveyor 8 from which it is transferred by way of the roller bed 9 to the collecting shaft 11 and the wire coil is formed on the mandrel 10. Rolled wire ends which are not of proper quality, being for example uncooled, can be cut off by the shears assembly 12 and thereafter conveyed away separately.
Figure 2 shows the construction of the cooling section 2. In this arrangement the cooling section 2 comprises a plurality of individual cooling pipes 13 which are mounted on prism blocks 21 and which are laid in channels or troughs 20. Disposed after each individual cooling pipe 13 which is followed by further cooling pipes 13 is a wiper or stripping nozzle 14.
Provided after the last cooling pipe 13, which is the downstream cooling pipe, is a combined wiper or stripping nozzle which consists of a water nozzle 17 and an air nozzle 18, with the air nozzle 18 being disposed downstream of the water nozzle 17. In that arrangement the water nozzle 17 performs the same function and is of the same structure as the stripping nozzle 14.
Cooling of the rolled wire is effected in known maner in the individual successively disposed cooling pipes 13 by the cooling pipes 13 being supplied with cooling water in the direction of the moving rolled wire. The improvement in cooling action by increasing the turbulence of the water passing through the arrangement is achieved by the installation of elements for increasing the amount of turbulence. In that way cooling of the rolled wire is effected at the maximum rate of cooling, while the braking force of the water acting on the rolled wire is minimised. For that purpose, the ratio of the cooling pipe inside diameter
D to the rolled wire diameter d does not rise above or fall below a value of 2 to 3.In order to hold the rolled wire constantly in the middle of the cooling pipes 13 in order to provide for uniform cooling of the wire over the cross-section thereof, the wire is guided in the head of the respective cooling pipe 13 in guide bushes 15 (see Figure 3) and guides 16 (see Figure 4) within the nozzle 14, the water nozzle 17 and the air nozzle 18. The ratio of the inside diameter D' of the guide bushes 15 and the guides 16, to the rolled wire diameter d, is from 1.5 to 2.5, and the ratio does not go above or fall below that value. The successively disposed cooling pipes 13 provide for uninterrupted cooling of the rolled wire, without intermediate temperature equilibrium or balancing.In order to achieve the necessary rapid cooling action, the static pressure in the cooling pipe 13 is increased by pressurised water being supplied to the nozzles 14 which are disposed between the cooling pipes 13, the pressure of the pressurised water being the same as the feed pressure of the cooling water for the cooling pipe 13, and the spacing a from the end of the cooling pipe 13 to the beginning of the nozzle 1 5 or the water nozzle 17 being twice the inside diameter of the cooling pipes 13.In order to ensure that the cooling water is reliably stripped or wiped away after the last cooling pipe 13, that is to say at the end of the cooling section 2, and thereby to ensure the necessary temperature equilibrium or balancing effect in a fault-free manner, the cooling water is stripped away by means of water fed through the water nozzle 17 and with air fed through the air nozzle 18. The pressure of the water in the water nozzle 1 7 is at a value which corresponds to 1.5 times the feed pressure of the cooling water to the last cooling pipe 13.
Figure 5 shows the turn laying means 6 provided with a laying tube 22 and a guide plate or baffle 23 which is disposed at the outlet or discharge of the laying tube 22. When rolling the concrete steel which has been strengthened with heat treatment, with an annealed marginal martensite layer, it is necessary for the water cooling effect to be cut in only after the tip of the rolled wire has been engaged by the wire driver 3. As the cooling water is switched on in a very short period of time, there is a very sharp transition between the uncooled tip of the wire and the following cooled wire. That transition is advantageous in order to minimise the amount of scrap, but the resulting difference in stiffness of the wire also gives rise to an abrupt rise in the speed of discharge A of the turns of wire out of the turn laying means 6.That fact which has been found in practical rolling operation can be explained by virtue of the consideration that the increased stiffness of the cooled wire causes the guidance thereof in the laying tube 22 to change. If the rolled wire is not cooled to below 800 . . 750"C, then it is guided in a stable fashion in the region b of the discharge opening of the laying tube (see Figure 6).
When the wire is cooled to a temperature of 600"C and below, as a result of the increased stiffness of the wire, the path thereof, through the tube 22, is altered and, in an extreme situation, it is even diplaced to the other inward side of the tube, and the change in the speed of discharge of the wire from the turn laying means 6 can be explained. There is an increase in the angle of discharge, that is to say, the pitch of the turns of wire. If a conventional inside diameter of the laying tube 22 of d = 35... 40 mm is assumed, that change in pitch is considerable. When the cooling water is cut-in in a very short period of time, in the manner described hereinbefore, that results in poor-quality overlapping of the wire turns on the roller bed 7 and the conveyor 8 downstream of the turn laying means 6, and then results in defects in the shaft 18. The wire turns which are cooled to > 600 C, as it were, overtake the turns which have not been cooled. In accordance with the invention, overlapping of the turns of wire is counteracted by a guide plate 23 being disposed at the discharge of the laying tube 22. For that purpose the laying tube 22 is preferably tapered off or bevelled at an angle of = 3... 5'. The resulting lateral laying tube opening is closed by a flat guide plate 23 which, at the discharge opening, approaches the middle of the tube, to a dimension of c = 3... 5 mm (see Figure 7). Jamming or compression of the wire in the laying tube 22 is prevented by virtue of that arrangement. It is also possible for the laying tube 22 to be bevelled off or tapered off at both sides. When the water cooling operation is operative, the wire is then guided by the guide plate 23, that is to say, the change in pitch is approximately halved and the overlapping which gives rise to problems in regard to collecting the wire is then avoided.
Claims (12)
1. A process for the production of a concrete reinforcing steel wire, on high-capacity wire rolling installations, which has good welding properties and which is subjected to a heat treatment whereby a mixed structure of ferrite and perlite is formed in the core cross-section and the surface has a closed annealed martensite layer, in which cooling of the rolled wire is concluded before the wire reaches a first wire drive means, temperature equilibrium is produced between the first and a second wire drive means, and the resulting steel wire thereafter is at a temperature which ensures fault-free formation of turns, the heat treatment and the operation of forming the structure of the concrete steel already being concluded at that time.
2. A process as claimed in claim 1, in which after the steel wire has been laid in turns, it is subjected to further cooling by means of air, that cooling operation being matched to the alloy content of the rolled wire so that the y- & conversion occurs virtually completely
in the perlite stage.
3. A process as claimed in claim 1 or claim 2, in
which cooling of the rolled wire is effected without
interruption and without intermediate temperature
equilibrium and, by increasing the static pressure of the cooling water, rapid cooling is achieved, which is
effected by stripping means which are supplied with
pressurised water.
4. Apparatus for carrying out the process claimed
in any preceding claim, in which a first wire driver and
a guide means are provided in the part of the
installation for the heat treatment, downstream of a
cooling section which is provided with cooling pipes,
and a second wire driver is arranged downstream of
the guide means, but upstream of a turn laying means
which is inclined through 10'.
5. Apparatus as claimed in claim 4, in which the
cooling pipes are mounted on prism members and are
arranged in troughs, and between the individual
cooling pipes are stripping nozzles supplied with water
at the same pressure as the cooling water and
disposed between the last cooling pipe and the guide
means is a combined stripping nozzle comprising a
water nozzle which is supplied with water at a pressure which is 1.5 times the cooling water pressure, and an air nozzle.
6. Apparatus as claimed in claim 5, in which the stripping nozzles and water nozzles have the same function and the same structure and are disposed at a given spacing relative to the end of the respective cooling pipe, the spacing being double the inside diameter of the cooling pipes.
7. Apparatus as claimed in claim 5 or claim 6, in which guide bushes are provided in the heads of the cooling pipes and the stripping nozzles, and the water and air nozzles have guide means whose inside diameters relative to the rolled wire diameter are in a ratio of 1.5 to 2.5, which ratio does not go above or fall below said values.
8. Apparatus as claimed in any one of claims 4 to 7, in which the cooling pipes have an inside diameter which is in a ratio of 2 to 3 to the rolled wire diameter, which ratio does not go above or fall below said values.
9. Apparatus as claimed in any one of claims 4 to 8, in which the turn laying means is provided with a laying tube whose outlet opening is of a tapered configuration and is provided with a guide plate which approaches the middle of the tube at the outlet opening.
10. Apparatus as claimed in claim 9 in which the distance between the axis of the laying tube and the tapered end wall is 3 to 5 mm and the tapered portion is at an angle of 3 to 5 .
11. A process for the production of concrete reinforcing steel wire substantially as hereinbefore described with reference to the accompanying drawings.
12. Apparatus for the production of concrete reinforcing steel wire substantially as herein before described with reference to and an illustrated in the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DD85279054A DD239805B1 (en) | 1985-07-29 | 1985-07-29 | METHOD FOR PRODUCING A CONCRETE STEEL |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8608505D0 GB8608505D0 (en) | 1986-05-14 |
| GB2178981A true GB2178981A (en) | 1987-02-25 |
| GB2178981B GB2178981B (en) | 1989-05-10 |
Family
ID=5570002
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8608505A Expired GB2178981B (en) | 1985-07-29 | 1986-04-08 | Process and apparatus for producing a concrete-reinforcement steel wire |
Country Status (7)
| Country | Link |
|---|---|
| BE (1) | BE904958A (en) |
| DD (1) | DD239805B1 (en) |
| DE (1) | DE3601753A1 (en) |
| FR (1) | FR2585368B1 (en) |
| GB (1) | GB2178981B (en) |
| IT (1) | IT1204824B (en) |
| SE (1) | SE467928B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102626712A (en) * | 2012-05-08 | 2012-08-08 | 山西太钢不锈钢股份有限公司 | Rolling equipment and method for stainless threaded steel |
| US8375760B2 (en) | 2007-07-16 | 2013-02-19 | Sms Meer Gmbh | Making and coiling rod and wire |
| CN111069319A (en) * | 2019-11-26 | 2020-04-28 | 湖州吴兴珀莱机械厂 | Quick cooling device is used in steel pipe production |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES470858A1 (en) * | 1977-06-20 | 1979-10-01 | British Steel Corp | Welded steel rod grid prodn. for use as concrete reinforcement - by hot rolling steel into rod, water cooling, air cooling to temper the surface and welding to form grid |
| FR2445499B1 (en) * | 1978-12-26 | 1983-11-10 | Siderurgie Fse Inst Rech | |
| DE2900271C2 (en) * | 1979-01-05 | 1984-01-26 | Stahlwerke Peine-Salzgitter Ag, 3150 Peine | Weldable reinforcing steel and process for its manufacture |
| FR2457724A1 (en) * | 1979-06-01 | 1980-12-26 | Siderurgie Fse Inst Rech | DEVICE FOR COOLING LONG RUNNING PRODUCTS |
| DE3029229A1 (en) * | 1980-08-01 | 1982-04-01 | Moeller & Neumann Gmbh, 6670 St Ingbert | Rolled steel wire water cooled and coiled without reel - is coil cooled in air to form pearlite core with tempered martensite skin |
| DD210621A1 (en) * | 1982-10-14 | 1984-06-20 | Thaelmann Schwermaschbau Veb | RINGDUESE FOR STRIPPING THE COOL WATER FROM THE ROLL |
| US4527408A (en) * | 1983-10-31 | 1985-07-09 | Morgan Construction Company | Method and Apparatus for cooling and handling hot rolled steel rod in direct sequence with a high speed rolling operation |
| FR2569424B3 (en) * | 1984-08-23 | 1986-09-05 | Siderurgie Fse Inst Rech | METHOD OF MANUFACTURING LONG CRENELATED METAL PRODUCTS, PARTICULARLY STEEL, AND DEVICE FOR IMPLEMENTING SAME |
-
1985
- 1985-07-29 DD DD85279054A patent/DD239805B1/en not_active IP Right Cessation
-
1986
- 1986-01-22 DE DE19863601753 patent/DE3601753A1/en not_active Withdrawn
- 1986-03-04 IT IT19617/86A patent/IT1204824B/en active
- 1986-03-26 SE SE8601405A patent/SE467928B/en not_active IP Right Cessation
- 1986-04-08 GB GB8608505A patent/GB2178981B/en not_active Expired
- 1986-04-23 FR FR8605851A patent/FR2585368B1/en not_active Expired - Fee Related
- 1986-06-19 BE BE0/216807A patent/BE904958A/en not_active IP Right Cessation
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8375760B2 (en) | 2007-07-16 | 2013-02-19 | Sms Meer Gmbh | Making and coiling rod and wire |
| CN102626712A (en) * | 2012-05-08 | 2012-08-08 | 山西太钢不锈钢股份有限公司 | Rolling equipment and method for stainless threaded steel |
| CN111069319A (en) * | 2019-11-26 | 2020-04-28 | 湖州吴兴珀莱机械厂 | Quick cooling device is used in steel pipe production |
Also Published As
| Publication number | Publication date |
|---|---|
| BE904958A (en) | 1986-10-16 |
| GB8608505D0 (en) | 1986-05-14 |
| DD239805B1 (en) | 1988-06-22 |
| SE467928B (en) | 1992-10-05 |
| GB2178981B (en) | 1989-05-10 |
| SE8601405L (en) | 1987-01-30 |
| FR2585368A1 (en) | 1987-01-30 |
| DE3601753A1 (en) | 1987-01-29 |
| IT1204824B (en) | 1989-03-10 |
| IT8619617A0 (en) | 1986-03-04 |
| SE8601405D0 (en) | 1986-03-26 |
| FR2585368B1 (en) | 1993-05-07 |
| DD239805A1 (en) | 1986-10-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) | ||
| 732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19990408 |