CN117425532A - Device and method for rolling metal products - Google Patents

Device and method for rolling metal products Download PDF

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Publication number
CN117425532A
CN117425532A CN202280039696.1A CN202280039696A CN117425532A CN 117425532 A CN117425532 A CN 117425532A CN 202280039696 A CN202280039696 A CN 202280039696A CN 117425532 A CN117425532 A CN 117425532A
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CN
China
Prior art keywords
rolling
metal product
frequency
power
comprised
Prior art date
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Pending
Application number
CN202280039696.1A
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Chinese (zh)
Inventor
M·科伦坡
R·瑞尔兹
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Yiou Luoshi Co ltd
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Yiou Luoshi Co 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 Yiou Luoshi Co ltd filed Critical Yiou Luoshi Co ltd
Publication of CN117425532A publication Critical patent/CN117425532A/en
Pending 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
    • 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
    • B21B1/18—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 in a continuous process
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/02—Hardening articles or materials formed by forging or rolling, with no further heating beyond that required for the formation
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34—Methods of heating
    • 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
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/13—Modifying the physical properties of iron or steel by deformation by hot working
    • 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
    • C21D9/525—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length for wire, for rods
    • 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
    • C21D9/562—Details
    • C21D9/563—Rolls; Drums; Roll arrangements
    • 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
    • B21B2027/103—Lubricating, cooling or heating rolls externally cooling externally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/02—Transverse dimensions
    • B21B2261/08—Diameter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/14—Reduction rate
    • 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
    • B21B27/02—Shape or construction of rolls
    • B21B27/024—Rolls for bars, rods, rounds, tubes, wire or the like
    • 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
    • B21B27/02—Shape or construction of rolls
    • B21B27/03—Sleeved rolls
    • B21B27/035—Rolls for bars, rods, rounds, tubes, wire or the like
    • 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
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34—Methods of heating
    • C21D1/42—Induction heating

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Geometry (AREA)
  • Metal Rolling (AREA)
  • Forging (AREA)

Abstract

Device (10) for rolling a metal product (P), initially in the form of a wire of initial thickness (Si), for producing a metal wire with final thickness (Sf). The rolling device (10) comprises a plurality of rolling units (11) aligned along a working axis (X) of the metal product (P). The invention also relates to a corresponding method for rolling said metal product (P).

Description

Device and method for rolling metal products
Technical Field
The present invention relates to a device and a corresponding method for rolling wire to obtain wire, which can be used for example in the fields of aviation, medical, automotive, construction, industry, agriculture and animal husbandry, for small metal parts, fences, etc.
The invention applies mainly (although not exclusively) to post-treatment processes (essentially from hot rolling processes) of metallic materials to obtain specific mechanical properties of resistance and workability according to specific intended uses.
Background
It is known that long articles (such as wires) obtained from hot rolling processes downstream of continuous casting are often used as starting articles in subsequent supply chains to obtain final articles having the desired dimensional characteristics and mechanical properties.
For example, rolling or drawing devices are known that use wire as the metal product at the inlet, which is wound into coils and arranged on suitable feed rolls to obtain end products with different desired dimensions and cross sections.
In particular rolling devices comprising a plurality of rolling units, each provided with at least one pair of rolls or rings.
The rollers are mutually arranged to define a passage through which, in use, the metal article being processed passes.
The channel between one processing unit and the next is gradually reduced until it reaches the final thickness/size of the metal product, which will have the shape of a wire at the end of the process. Currently, these post-treatments of the wire obtained from the previous hot rolling steps are mainly cold, with limited reduction of the cross section both overall and per pass, since the state of the material and the excessive number of passes increase the work hardening of the final product.
Furthermore, during cold rolling, the metal articles must be constantly lubricated with a powdered lubricant that pollutes the environment. In order to partially reduce such environmental pollution, expensive pumping, purifying and treating facilities are used, however, this not only affects the cost of the overall facility, but also does not completely solve the problem.
Thus, at the end of the process, it is necessary to place the obtained product in a suitable annealing oven to reduce its brittleness. This step increases the production time and does not always allow to obtain a product with the desired mechanical properties.
Furthermore, it is currently difficult or even impossible to roll wire rods made of the following materials, due to the type of process: high carbon or cobalt content steel, titanium and its alloys, work hardened nickel based superalloys, work hardened cobalt based superalloys, and other materials obtained from powder sintering as well to obtain corresponding metal wires. In fact, the product may be cracked or broken during processing.
Devices for thermal processing are also known, such as the device described in US2004/016478 A1.
Accordingly, there is a need for a device and method for rolling wire that overcomes at least one of the drawbacks of the prior art.
In particular, it is an object of the present invention to provide a rolling device that starts from a wire made of: high carbon or cobalt content steel, titanium and its alloys, work hardening nickel or cobalt based superalloys, and other materials obtained from powder sintering, the nominal diameter of the wire is comprised between about 3mm and about 8mm, the rolling device being capable of producing a wire with a nominal diameter comprised between about 0.5mm and about 1.5mm, eliminating the work hardening problem of the material.
It is a further object of the present invention to provide such an apparatus that does not require the presence of an annealing furnace at the end of the production line.
Another object is to perfect a method for rolling wire that allows to reduce the thickness considerably even on materials that normally have work hardening problems.
Another object is to provide an apparatus for rolling wire and a corresponding method for producing a wire requiring a low energy supply, which method does not release contaminants into the environment and is therefore environmentally sustainable.
The applicant has devised, tested and embodied the present invention to overcome the shortcomings of the state of the art and to obtain these and other purposes and advantages.
Disclosure of Invention
The invention is set forth and characterized in the independent claims. The dependent claims describe other features of the invention or variants to the main inventive concept.
According to the above object, a device for rolling a metal product, initially in the form of a wire with an initial thickness comprised between 3mm and 8mm, for producing a metal wire with a final thickness comprised between 0.5mm and 1.5mm, comprises a plurality of rolling units aligned along the working axis of the above metal product.
According to one aspect, the apparatus includes a primary heating furnace disposed upstream of a first one of the rolling units, the primary heating furnace configured to operate at a primary power at a primary frequency, and a plurality of secondary heating units alternating with the rolling units along a processing axis, the plurality of secondary heating units configured to operate at a secondary power at a secondary frequency to heat/restore the metal article to a suitable processing temperature. The primary power is greater than the secondary power and the primary frequency is greater than or equal to the secondary frequency.
According to some embodiments, a method for rolling a metal article is provided that may obtain a metal article from a wire in the form of an initial thickness comprised between about 3mm and about 8 mm.
The method further provides for continuously and sequentially feeding the metal product through a plurality of rolling units disposed in alignment along a processing axis of the metal product, gradually reducing the thickness of the metal product until it is in the form of a wire having a final thickness comprised between about 0.5mm and about 1.5 mm.
According to one aspect, the metal product is passed through a main heating furnace operating at a main power at a main frequency to heat the metal product from ambient temperature to a suitable processing temperature before the metal product is fed through a first one of the rolling units.
In addition, as the metal product is fed between one rolling unit and the next, the metal product is passed through a secondary heating unit that operates at a secondary power at a secondary frequency to maintain the metal product at an optimal processing temperature. The primary power is greater than the secondary power and the primary frequency is greater than or equal to the secondary frequency.
Drawings
These and other aspects, features and advantages of the present invention will be apparent from the following description of some embodiments, given as non-limiting examples with reference to the accompanying drawings, in which:
FIG. 1 is a schematic side view of a rolling apparatus according to some embodiments described herein;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a schematic elevation view of two pairs of rolls disposed in orthogonal planes;
fig. 4 shows a perspective view of a rolling unit of a rolling device associated with a cooling circuit.
To facilitate understanding, identical reference numerals have been used, where possible, to designate identical elements that are common to the figures. It is to be understood that elements and features of one embodiment can be conveniently combined or incorporated in other embodiments without further description.
Detailed Description
Reference will now be made in detail to the possible embodiments of the invention, one or more examples of which are illustrated in the accompanying drawings by way of non-limiting illustration. The phraseology and terminology used herein is for the purpose of providing a non-limiting example as well.
According to the invention, a rolling device 10 is configured to roll a metal product P in the form of a wire rod in order to obtain a metal wire having a small thickness and certain mechanical characteristics.
Here and in the following description and claims, the term metal product P refers to the product being processed, initially in the form of a wire, and at the end of the process carried out with the rolling device 10 in the form of a wire.
The metal product P is made of a material selected from the group consisting of: titanium and its alloys, sintered cobalt-based materials and their alloys, stainless steel rich in high percentage chromium, titanium-rich stainless steel, high carbon or low carbon steels, nickel-based alloys, tungsten.
The metal product P may be made of a magnetic or non-magnetic material.
For example, materials considered may be materials obtained from sintered powders (C-Cr-Mo-W-Co-V), titanium and titanium alloys, titanium Gr21 superalloys (Mo-Nb-Mo-Al), hardened nickel-base superalloys (Co-Cr-Mo-Nb), hardened cobalt-base superalloys (Ni-Cr-W), and others.
The initial thickness Si of the metal product P in wire form is comprised between about 3mm and about 8mm and the final thickness Sf of the metal product P in wire form is comprised between about 0.5mm and about 1.5 mm. It should be noted that the initial thickness dimension and the final thickness dimension of the metal article should not be considered as limiting the applicability of the present invention.
According to some embodiments, the metal product P may have a circular, oval, square, rectangular, hexagonal, octagonal, semicircular cross-section, or similar shape.
In the case of a metal product P having a circular cross-section, the thicknesses Si, sf substantially correspond to the diameter of the circular cross-section.
According to some embodiments, the rolling device 10 comprises a plurality of rolling units 11, each provided with a rolling plant 12 having at least one pair of rolls 13.
The rolling unit 11 is disposed in alignment along the working axis X of the metal product P. In the embodiment shown in fig. 1 to 2, there are four rolling units 11. However, the configuration of the device with a greater or lesser number of rolling units 11 is not excluded. The number of rolling units 11 is in any case smaller than in conventional cold rolling plants, the total compression ratio of the metal product P between the inlet and the outlet being the same.
The configuration with four rolling units 11 is advantageous because the rolling device 10 is very compact, the in-line length is less than 4m, and the rolling results in a reduction of the thickness variation of the metal product P by more than 99% as a whole.
It should be noted that the rolling plant 10 can in any case be generally configured according to the type of material constituting the metal product P, by varying the reduction transmission of the rolling units, to vary the number of passes in which the entire rolling is performed.
In the embodiment described herein, each rolling plant 12 comprises four pairs of rolls 13, which are alternately arranged in two planes, each plane being transverse with respect to the other.
In particular, the first and third pairs of rolls 13 lie in a vertical plane, while the second and fourth pairs of rolls 13 lie in a horizontal plane, substantially orthogonal to the vertical plane.
The pairs of rolls 13 are sequentially arranged in a vertically-horizontally alternating manner.
In a possible embodiment, the planes of the pairs of rolls 13 may be set at angles other than 90 ° inclined to each other.
The pairs of rollers 13 define between them a channel 14 (fig. 3), the gap of which channel 14 along the machining axis X is reduced, in which channel 14 the metal product P is pushed/pulled by the sliding of the rollers 13.
The channel 14 is substantially horizontal.
In particular, each rolling plant 12 allows to obtain a determined compression pitch (R).
The compression pitch R is defined by the ratio between the cross-sectional area of the metal product P at the inlet of the rolling mill 12 and the cross-sectional area of the metal product P at the outlet of the rolling mill 12.
The compression pitch R is also defined by the ratio between the speed of the metal product P at the inlet of the rolling plant 12 and the speed of the metal product P at the outlet of the rolling plant 12.
Each rolling plant 12 is characterized by a percentage of the compression pitch R preferably comprised between 58% and 75%, more particularly between about 60% and about 68%. The overall compression between the inlet and outlet of the machine is considered to be in any case even up to about 99%.
According to some embodiments, the compression pitch R of the first rolling plant 12 is greater than the compression pitch R of the subsequent rolling plant.
In a possible embodiment, the compression pitches R of the rolling plants 12 other than the first rolling plant are practically equal to each other.
According to some embodiments, each rolling plant 12 comprises a single driving member 15, which driving member 15 is connected to the pairs of rolls 13 in a known manner so as to rotate them. Each pair of rolls 13 rotates at different speeds to cause the rolling flow as a result of the elongation of the metal product P as a result of the compression of the section.
Each driving member 15 is electronically managed so as to drive the roller 13 in such a way as to determine a controlled sliding component between the roller 13 and the metal product P fed. For example, each driving member 15 may comprise a direct current motor and transmission connected to the motor and to the shaft on which the roller 13 is keyed.
Referring to fig. 4, the rolling device 10 includes a cooling system 20 to cool the mechanical components of the rolling unit 11. The mechanical components may include at least the support blocks of the rolls 13 and any other components that may be overheated by the hot metal product P passing through the rolling unit 11.
The cooling system 20 is a closed circuit so that there is no direct contact between the refrigerant fluid and the metal product P.
The cooling system 20 includes a delivery line 20a and a return line 20b, and a heat exchanger 20c. Within the delivery line 20a and return line 20b, a known type of refrigerant fluid may flow.
Advantageously, the presence of the cooling system 20 allows the machining to be performed without interrupting the process, which may be caused by overheating of certain mechanical parts, among other factors, as in the prior art.
The rolling device 10 comprises a main heating furnace 16 arranged upstream of the first rolling unit 11 and a plurality of secondary heating units 17 alternating with the rolling unit 11 along the working axis X, through which secondary heating units 17 the metal product P being worked is passed in order to be heated or restored to a suitable working temperature Tw.
The presence of the primary and secondary heating furnaces 16, 17 allows to obtain a greater compression pitch R, since it requires less energy to deform when the material constituting the metal product P is at the processing temperature Tw.
In addition, by heating the metal product P, a powdery lubricant that would contaminate the processing environment is not required.
The main heating furnace 16 is configured to heat the metal product P from the ambient temperature Ta to the processing temperature Tw for the first time.
According to some embodiments, the primary and secondary heating furnaces 16, 17 are induction type.
The primary and secondary heating units 16, 17 are preferably operated at very high frequencies and low power and are temperature-tunable so that they can be used for many materials and applications. However, it is not excluded that the primary heating furnace 16 and/or the secondary heating unit 17 may also be operated at low frequencies.
The very high frequency is in the range of about 400-500 kHz. These frequencies are applicable to non-magnetic materials such as titanium, hardened nickel, stainless steel, hardened cobalt, and the like.
The low frequency refers to the range of about 6-10 kHz. These frequencies are applicable to magnetic materials such as low carbon and high carbon steels.
According to some embodiments, the operating frequency of the primary heating furnace 16, or primary frequency F1, and the operating frequency of the secondary heating unit 17, or secondary frequency F2, may be fixed or adjustable.
The adjustment of the frequencies F1, F2 may be based on the type of material constituting the metal product P, for example magnetic or non-magnetic.
The power or primary power P1 of the primary heating furnace 16 is greater than the power or secondary power P2 of the single secondary heating unit 17. For example, the power of the main heating furnace 16 is about 5-8 times the power of the single sub-heating unit 17.
For example, in the case of induction technology, the primary furnace 16 may have a primary power P1 of about 75kW, and the secondary power P2 of the single secondary heating unit 17 of about 10kW.
According to another example, the primary heating furnace 16 may have a primary power P1 of about 50kW and the single secondary heating unit 17 may have a secondary power P2 of about 10kW. Regarding the processing frequency, the main heating furnace 16 may perform processing at a main frequency F1 of about 400-500kHz, and the single sub-heating unit 17 may perform processing at a sub-frequency of about 400kHz.
According to a possible embodiment, the heating apparatus 10 comprises a temperature detection device configured to detect the temperature of the metal product P, corresponding to the inlet and/or outlet of the primary heating furnace 16 and of the secondary heating unit 17.
The rolling device 10 also comprises a central unit which receives the temperature data from the temperature detection means and manages the power and/or frequency of the primary 16 and secondary 17 heating units so as to keep the temperature of the rolled product P constant, regardless of the variation in thickness thereof. In fact, the reduction in thickness of the metal product P corresponds to a different distribution of the thermal load applied in order to keep its temperature constant.
Advantageously, the rolling is carried out at a temperature which is kept almost constant.
In thermoplastic deformation, the temperature and stress conditions imposed on the metal can lead to rapid recrystallization (dynamic recrystallization) during this process to prevent the build-up of a hardened state of the metal. Recrystallization replaces the crystal structure of the deformed grains with a series of new grains that are free of stress and deformation.
The processing temperature Tw is selected to be comprised between about 700 ℃ and 800 ℃ up to about 1200 ℃ based on the material to be rolled, the treatment to be performed and the properties to be obtained.
According to some embodiments, the roller 13 is made of a special material with a low thermal conductivity, so as to reduce as much as possible the heat released by the metal product P during the processing.
The low thermal conductivity is about 1 W.m -1 ·K -1 And about 2 W.m -1 ·K -1 Is in the range of (2).
For example, the roller 13 may be made of a sintered material, such as a sintered ceramic alloy having a low thermal conductivity.
According to a preferred embodiment, the roller 13 is made of yttrium-stabilized zirconia, having a thermal conductivity of about 2 W.m -1 ·K -1 Either wholly or in compound form by the substrate and coating.
Upstream of the main furnace 17, the apparatus 10 comprises one or more reels 18, on which reels 18 the metal product P in the form of a wire is wound into coils. The reels may be of different types based on the weight of the coil to be produced and/or the temperature at the outlet of the rolling process.
A winding device 19 is located downstream of the last rolling unit 11, configured to receive the produced wire and wind it into a coil.
According to a possible embodiment, the rolling of the metal product P may take place in a controlled environment with an inert gas, such as argon or nitrogen.
Some embodiments described herein also relate to a method for rolling a metal product P.
The method is provided for processing a metal product P in wire form, the initial thickness Si comprising between about 3mm and about 8 mm.
The method is provided for continuously feeding the metal product P by means of a plurality of rolling units 11 arranged in alignment along the working axis X of the metal product P, reducing the thickness of the metal product P until it is in the form of a metal wire having a final thickness Sf comprised between about 0.5mm and about 1.5 mm.
According to one aspect of the above method, before the metal product P is fed through the first rolling unit 11, the metal product P is passed through a main heating furnace 16, which heats the metal product P from the ambient temperature Ta to a suitable processing temperature Tw. Further, when the metal product P is fed between one rolling unit 11 and the next rolling unit, the metal product P is passed through the sub-heating unit 16, which returns the metal product P to the processing temperature Tw.
According to some embodiments, the metal product P is initially in the form of a wire and is wound on one or more coils provided on the respective reels 18.
The metal product P, which is introduced in the form of a wire, is unwound, straightened and directed (for example by means of suitable drawing rolls) into a main heating furnace 16.
The metal product P passes through the rolling units 11 in a continuous manner, in each of which the thickness of the metal product P is reduced by a percentage of the compression pitch R comprised between 58% and 75%, more specifically between about 60% and about 68%.
According to a possible embodiment, the path of the metal product P passing inside the primary and secondary heating furnaces 16, 17 is straight and the control of the pull determining the slip value is controlled by an electronic system, making it possible to increase the residence time between the rolling units 11, while keeping the feed speed unchanged. For example, a metal article may be provided to follow a zigzag path.
According to a possible embodiment, the rolling device 10 also comprises automatic means for unloading the coils of the rolled product P. The coil is removed from the rolling device 10 and cooled in a stationary atmosphere to complete the metallurgical transformation (destressing). The coil is taken out and cooled, and the device continues to process the next metal product P.
It is clear that modifications and/or additions of parts or steps may be made to the apparatus and method for rolling wire as described heretofore, without departing from the field and scope of the present invention as defined in the attached claims.
In the following claims, any reference signs placed between parentheses shall not be construed as limiting the claim.

Claims (16)

1. Device (10) for rolling a metal product (P), initially in the form of a wire with an initial thickness (Si) comprised between 3 and 8mm, for producing a metal wire with a final thickness (Sf) comprised between 0.5 and 1.5mm, the rolling device (10) comprising a plurality of rolling units aligned along a working axis (X) of the metal product (P), characterized in that: comprising a main heating furnace (16) arranged upstream of a first rolling unit (11) of said plurality of rolling units (11) and a plurality of auxiliary heating units (17) alternating with said rolling units (11) along said working axis (X), said main heating furnace (16) being configured to operate at a main power P1 at a main frequency F1, said auxiliary heating unit (17) being configured to operate at an auxiliary power P2 at an auxiliary frequency F2 in order to heat/restore said metal product (P) to a suitable working temperature (Tw) for rolling in the corresponding rolling unit (11), and wherein said main power P1 is greater than said auxiliary power P2 and said main frequency F1 is greater than or equal to said auxiliary frequency F2.
2. The rolling device (10) according to claim 1, wherein each of the rolling units (11) comprises a rolling apparatus (12), the rolling apparatus (12) having at least one pair of rolls (13), between which rolls (13) a channel (14) is defined with reduced clearance along a processing axis (X), the channel (14) having an initial transverse dimension comprised between about 3mm and about 8mm and a final transverse dimension comprised between about 0.5mm and about 1.5 mm.
3. Rolling device (10) according to claim 1 or 2, characterized in that the maximum power of the primary heating furnace (16) is approximately 5-8 times the maximum power of the single secondary heating unit (17).
4. Rolling device (10) according to claim 2, characterized in that the power and frequency of the primary heating furnace (16) and of the secondary heating unit (17) are adjustable, wherein the frequency and/or power are adjusted on the basis of the type of material constituting the metal product (P) and/or on the basis of the current thickness of the metal product (P) being worked.
5. Rolling device (10) according to any one of the preceding claims, characterized in that said primary power P1 is equal to 50kW, said primary frequency F1 is equal to 400-500kHz, said secondary power P2 is equal to 10kW, and said secondary frequency F2 is equal to 400kHz.
6. Rolling device (10) according to claim 2, characterized in that each rolling plant (12) is characterized by a percentage compression pitch (R) comprised between 58% and 75%, preferably by a percentage compression pitch (R) comprised between 60% and 68%.
7. Rolling device (10) according to claim 2, characterized in that said rolls (13) are made entirely or at least externally coated with a special material of low thermal conductivity, said thermal conductivity being comprised between 1W-m -1 ·K -1 And 2 W.m -1 ·K -1 In order to minimize the heat released by the metal product (P) during the processing.
8. Rolling device (10) according to claim 5, characterized in that said rolls (13) are made entirely or at least externally coated with a sintered ceramic material based on yttrium-stabilized zirconia.
9. Rolling device (10) according to claim 2, comprising a closed-circuit cooling system (20) configured to cool at least the rolls (13).
10. A method for rolling a metal product (P), comprising:
the metal product (P) is made in the form of a wire with an initial thickness (Si) comprised between 3mm and 8mm,
continuously feeding the metal product (P) by means of a plurality of rolling units (11) aligned along a working axis (X) of said metal product (P), reducing the thickness of said metal product (P) until said metal product (P) is in the form of a wire having a final thickness (Sf) comprised between 0.5mm and 1.5mm,
characterized in that the metal product (P) is passed through a main heating furnace (16) before being fed through a first rolling unit (11) of the plurality of rolling units (11), the main heating furnace (16) being operated at a main frequency F1 with a main power P1, the metal product (P) being heated from an ambient temperature (Ta) to a suitable processing temperature (Tw), and wherein the metal product (P) is passed through a secondary heating unit (17) when being fed between one rolling unit (11) and the next rolling unit (11), the secondary heating unit (17) being operated at a secondary power P2 at a secondary frequency F2, the metal product (P) being brought back to the suitable processing temperature (Tw),
and wherein the primary power P1 is greater than the secondary power P2 and the primary frequency F1 is greater than or equal to the secondary frequency F2.
11. Method according to claim 10, characterized in that the metal product (P) is passed through the rolling units (11) in a continuous manner, the thickness of the metal product (P) being reduced within each rolling unit (11) with a percentage compression pitch (R) comprised between 58% and 75%, preferably with a percentage compression pitch (R) comprised between 60% and 68%.
12. The method according to claim 10 or 11, characterized in that the rolling of the metal product (P) takes place at a nearly constant temperature and approximately equal to the recrystallization temperature of the material constituting the metal product (P).
13. The method according to any one of claims 10 to 12, characterized in that the metal article (P) is made of a material selected from the group comprising: titanium and its alloys, sintered cobalt based materials and their alloys, stainless steel rich in high percentage chromium, titanium rich stainless steel, high carbon content or low carbon content steel.
14. The method according to any one of claims 10 to 13, characterized in that the power and/or frequency of the primary heating furnace (16) and the secondary heating unit (17) is adjusted, wherein the frequency and/or power is adjusted based on the type of material constituting the metal product (P) and/or based on the current thickness of the metal product (P) being processed.
15. Method according to any one of claims 5 to 7, characterized in that the rolled metal product (P) is not subjected to intermediate annealing or final annealing.
16. Method according to any one of claims 5 to 7, characterized in that the tension of the metal product (P) is electronically controlled by determining the value of the sliding component between the rolls (13) and the metal product (P) during the entire rolling process, so that the residence time between the rolling units (11) is increased while the feeding speed of the metal product (P) is kept unchanged.
CN202280039696.1A 2021-04-01 2022-04-01 Device and method for rolling metal products Pending CN117425532A (en)

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IT102021000008258A IT202100008258A1 (en) 2021-04-01 2021-04-01 APPARATUS AND PROCEDURE FOR ROLLING A METALLIC PRODUCT
PCT/IT2022/050080 WO2022208568A1 (en) 2021-04-01 2022-04-01 Apparatus and method for rolling a metal product

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JP2590199B2 (en) * 1988-05-25 1997-03-12 株式会社日立製作所 Warm rolling method and apparatus
US5058410A (en) * 1989-03-14 1991-10-22 Boehler Gesellschaft M.B.H. Method and apparatus fo producing thin wire, rod, tube, and profiles, from steels and alloys with low deformability, particularly hardenable steels
US7192551B2 (en) * 2002-07-25 2007-03-20 Philip Morris Usa Inc. Inductive heating process control of continuous cast metallic sheets
PL2554281T3 (en) * 2011-08-01 2017-08-31 Primetals Technologies Germany Gmbh Method and apparatus for a continuous rolling
DE102011084735A1 (en) * 2011-10-18 2013-04-18 Sms Siemag Ag Scraper for a work roll of a rolling stand
US10005116B2 (en) * 2012-09-21 2018-06-26 Nippon Steel & Sumitomo Metal Corporation High frequency induction heating apparatus and processing apparatus
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