WO2022208568A1 - Apparatus and method for rolling a metal product - Google Patents
Apparatus and method for rolling a metal product Download PDFInfo
- Publication number
- WO2022208568A1 WO2022208568A1 PCT/IT2022/050080 IT2022050080W WO2022208568A1 WO 2022208568 A1 WO2022208568 A1 WO 2022208568A1 IT 2022050080 W IT2022050080 W IT 2022050080W WO 2022208568 A1 WO2022208568 A1 WO 2022208568A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- metal product
- rolling
- frequency
- power
- main
- Prior art date
Links
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 115
- 239000002184 metal Substances 0.000 title claims abstract description 115
- 238000005096 rolling process Methods 0.000 title claims abstract description 97
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000010438 heat treatment Methods 0.000 claims description 46
- 239000000463 material Substances 0.000 claims description 22
- 230000009467 reduction Effects 0.000 claims description 21
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 9
- 239000010936 titanium Substances 0.000 claims description 9
- 229910052719 titanium Inorganic materials 0.000 claims description 9
- 239000010941 cobalt Substances 0.000 claims description 8
- 229910017052 cobalt Inorganic materials 0.000 claims description 8
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 8
- 229910045601 alloy Inorganic materials 0.000 claims description 7
- 239000000956 alloy Substances 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 5
- 239000010935 stainless steel Substances 0.000 claims description 5
- 229910001220 stainless steel Inorganic materials 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 230000003247 decreasing effect Effects 0.000 claims description 4
- 238000001953 recrystallisation Methods 0.000 claims description 4
- 238000011144 upstream manufacturing Methods 0.000 claims description 4
- 238000000137 annealing Methods 0.000 claims description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 2
- 229910052804 chromium Inorganic materials 0.000 claims description 2
- 239000011651 chromium Substances 0.000 claims description 2
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims description 2
- 229910001928 zirconium oxide Inorganic materials 0.000 claims description 2
- 229910010293 ceramic material Inorganic materials 0.000 claims 1
- 239000000047 product Substances 0.000 description 75
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 10
- 239000011295 pitch Substances 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- 229910000601 superalloy Inorganic materials 0.000 description 6
- 229910052759 nickel Inorganic materials 0.000 description 5
- 238000005098 hot rolling Methods 0.000 description 3
- 239000000696 magnetic material Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 238000005482 strain hardening Methods 0.000 description 3
- 238000011282 treatment Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 229910020516 Co—V Inorganic materials 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910002110 ceramic alloy Inorganic materials 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000004320 controlled atmosphere Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 244000144972 livestock Species 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910052756 noble gas Inorganic materials 0.000 description 1
- 150000002835 noble gases Chemical class 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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
Definitions
- the present invention concerns an apparatus and a corresponding method for rolling wire rod to obtain a metal wire, for example usable in the aeronautical, medical, automotive, building, industrial, agriculture and livestock fields, in small metal parts, fences or other.
- the present invention is applied mainly, although not exclusively, in post treatment processes of metal material essentially coming from hot rolling processes, to obtain particular mechanical properties of resistance and workability, depending on the specific intended use.
- rolling apparatuses or drawing apparatuses which use, as the metal product at entry, wire rod wound in coils and disposed on suitable feed reels, to obtain a final product having a different and desired size and section.
- these comprise a plurality of rolling units, each of which is provided with at least one pair of rolling rollers, or rings.
- the rollers are reciprocally disposed so as to define a passage channel through which, during use, the metal product being worked is made to pass.
- Rolling apparatuses that work hot are also known, such as the one described in US2004/016478 Al.
- one purpose of the present invention is to provide a rolling apparatus which, starting from wire rod made of steel with a high content of carbon or cobalt, titanium and its alloys, superalloys based on work-hardened nickel or based on work-hardened cobalt, and other materials also obtained from the sintering of powders, and having a nominal diameter comprised between about 3mm and about 8mm, is able to make metal wire having a nominal diameter comprised between about 0.5mm and about 1.5mm, eliminating the problem of work-hardening of the material.
- Another purpose of the present invention is to provide such an apparatus which does not require the presence of an annealing furnace at the end of the line.
- Another purpose is to perfect a method for rolling wire rod which is able to achieve a significant reduction in thickness even on materials which typically have problems of work-hardening.
- Another purpose is to provide an apparatus and a corresponding method for rolling wire rod to produce metal wire which require a low energy supply, which do not release contaminants into the environment and which are 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.
- an apparatus for rolling a metal product initially in the form of wire rod with an initial thickness comprised between 3mm and 8mm, to produce a metal wire with a final thickness comprised between 0.5mm and 1.5mm, comprises a plurality of rolling units disposed aligned along a work axis of the metal product as above.
- the apparatus comprises a main heating furnace disposed upstream of a first of the rolling units and configured to operate with a main power at a main frequency, and a plurality of secondary heating units alternating with the rolling units along the work axis and configured to operate with a secondary power at a secondary frequency in order to take/retum the metal product to a suitable work temperature.
- the main power is greater than the secondary power and the main frequency is greater than or equal to the secondary frequency.
- a method for rolling a metal product which provides to make the metal product available in the form of wire rod having an initial thickness comprised between about 3mm and about 8mm.
- the method also provides to continuously and sequentially feed the metal product through the plurality of rolling units disposed aligned along a work axis of the metal product which carry out a progressive reduction in the thickness of the metal product until it is in the form of a metal wire having a final thickness comprised between about 0.5mm and about 1.5mm.
- the metal product before the metal product is fed through a first of the rolling units, the metal product is made to pass through a main heating furnace which takes the metal product from an ambient temperature to a suitable work temperature, operating with a main power at a main frequency.
- the metal product is made to pass through secondary heating units which keep the metal product at the optimum work temperature, operating with a secondary power at a secondary frequency.
- the main power is greater than the secondary power and the main frequency is greater than or equal to the secondary frequency.
- - fig. 1 is a schematic lateral view of a rolling apparatus in accordance with some embodiments described here;
- - fig. 2 is a top view of fig. 1 ;
- - fig. 3 is a schematic front view of two pairs of rollers disposed on orthogonal planes
- - fig. 4 shows a perspective view of the rolling units of the rolling apparatus with which a cooling circuit is associated.
- a rolling apparatus 10 in accordance with the present invention, is configured to roll a metal product P in the form of wire rod in order to obtain a metal wire having a smaller thickness and certain mechanical characteristics.
- metal product P we mean the product being worked, which is initially in the form of wire rod and at the end of the process implemented with the rolling apparatus 10 is in the form of a metal wire.
- the metal product P is made of a material selected from a group comprising titanium and its alloys, a sintered cobalt-based material and its alloys, a stainless steel enriched with high percentages of chromium, a titanium-enriched stainless steel, a steel with high or low carbon content, nickel based alloys, tungsten.
- the metal product P can be made with magnetic or non-magnetic materials.
- the materials considered can be a material obtained from the sintering of powders (C-Cr-Mo-W-Co-V), titanium and a titanium alloy, a titanium Gr 21 superalloy (Mo-Nb-Mo-Al), a hardened nickel-based superalloy (Co-Cr-Mo-Nb), a hardened cobalt-based superalloy (Ni-Cr-W), and others.
- the metal product P in the form of wire rod, has an initial thickness Si comprised between about 3mm and about 8mm and, in the form of metal wire, has a final thickness Sf comprised between about 0.5mm and about 1.5mm. It should be noted that the initial and final thickness sizes of the metal product should in no way be considered as limiting the applicability of the present invention.
- the metal product P can have a round, oval, square, rectangular, hexagonal, octagonal, half-round section, or similar or comparable shapes.
- the thickness Si, Sf is substantially equivalent to the diameter of the circular section.
- the rolling apparatus 10 comprises a plurality of rolling units 11, each of which is provided with a rolling device 12 having at least one pair of rollers 13.
- the rolling units 11 are disposed aligned along a work axis X of the metal product P.
- the number of rolling units 11 is in any case smaller than that of traditional cold plants, with the same total reduction ratio of the metal product P between entry and exit.
- the configuration with four rolling units 11 is advantageous because the rolling apparatus 10 is extremely compact, with an in-line length of less than 4m, and rolling leads, overall, to a variation in thickness of the metal product P with over 99% reduction.
- the rolling apparatus 10 can in any case generally be configured according to the type of material that the metal product P consists of, by varying the reduction of the rolling units and therefore the number of passes to perform the entire rolling.
- each rolling device 12 comprises four pairs of rollers 13 disposed alternating on two planes, each plane transverse with respect to the other.
- a first and a third pair of rollers 13 lie on a vertical plane while a second and a fourth pair of rollers 13 lie on a horizontal plane, substantially orthogonal to the vertical plane.
- the pairs of rollers 13 are disposed in sequence with vertical-horizontal alternation.
- the lying planes of the pairs of rollers 13 can be disposed reciprocally inclined by an angle other than 90°.
- the pairs of rollers 13 define between them a passage channel 14 (fig. 3) with a decreasing gap along the work axis X and inside which the metal product P pushed/drawn by the rollers 13 slides.
- the passage channel 14 is substantially horizontal.
- each rolling device 12 allows to obtain a determinate reduction pitch R.
- the reduction pitch R is defined by the ratio between the cross-sectional area of the metal product P at entry and the cross-sectional area of the metal product P at exit from the rolling device 12.
- the reduction pitch R is also defined by the ratio between the speed of the metal product P at entry and the speed of the metal product P at exit from the rolling device 12.
- Each rolling device 12 is characterized by a percentage reduction pitch R preferably comprised between 58% and 75%, more in particular between about 60% and about 68%.
- the overall reduction, considered between machine entry and exit, can in any case even reach about 99%.
- the reduction pitch R of the first rolling device 12 is greater than that of the subsequent ones.
- the reduction pitches R of the rolling devices 12 other than the first are practically equal to each other.
- each rolling device 12 comprises a single drive member 15 connected to the pairs of rollers 13 in a per se known manner, in order to make them rotate.
- Each pair of rollers 13 is made to rotate with a different speed in order to make the rolling fluid, as a consequence of the elongation of the metal product P due to the reduction in section.
- Each drive member 15 is electronically managed in order to drive the rollers 13 in such a way as to determine a controlled slipping component between the rollers 13 and the metal product P being fed.
- each drive member 15 can comprise a direct current motor and transmission means connected to the motor and to the shaft on which the rollers 13 are keyed.
- the rolling apparatus 10 comprises a cooling system 20 to cool the mechanical parts of the rolling units 11.
- the mechanical parts can comprise at least the supporting blocks of the rollers 13 and any other components which may undergo undue heating caused by the passage of the hot metal product P through the rolling unit 11.
- the cooling system 20 is a closed circuit, so there is no direct contact between the refrigerant fluid and the metal product P.
- the cooling system 20 comprises delivery 20a and return lines 20b and a heat exchanger 20c. Inside the delivery and return lines 20a, 20b a refrigerant liquid of a type known per se can flow.
- the presence of the cooling system 20 allows to work without process interruptions which, in the state of the art, are instead caused, among other factors, by the overheating of some mechanical components.
- the rolling apparatus 10 comprises a main heating furnace 16 disposed upstream of the first rolling unit 11 and a plurality of secondary heating units 17 alternating with the rolling units 11 along the work axis X and through which the metal product P being worked passes in order to be taken, or returned, to a suitable work temperature Tw.
- the presence of the main heating furnace 16 and of the secondary heating units 17 allows to obtain greater reduction pitches R, because when the material that the metal product P consists of is at the work temperature Tw, it requires less energy to be deformed.
- powdered lubricants are not required, which tend to contaminate the work environment.
- the main heating furnace 16 is configured to take the metal product P from ambient temperature Ta to a work temperature Tw for the first time.
- the main heating furnace 16 and the secondary heating units 17 are of the induction type.
- the main furnace 16 and the secondary heating units 17 preferably operate at very high frequency and low power, and are of the adjustable temperature type so that they can be used for many materials and applications. However, it is not excluded that the main furnace 16 and/or the secondary heating units 17 can also operate at low frequency.
- very high frequency we mean a range in the order of about 400-500 kHz. These frequencies are suitable for non-magnetic materials such as titanium, hardened nickel, stainless steel, hardened cobalt and others.
- low frequency we mean a range in the order of about 6-10 kHz. These frequencies are suitable for magnetic materials such as steel with low and high carbon content.
- the operating frequency of the main furnace 16, or main frequency FI, and of the secondary heating units 17, or secondary frequency F2 can be fixed or adjustable.
- the adjustment of the frequency FI, F2 can be based on the type of material that the metal product P consists of, for example magnetic or non-magnetic.
- the power of the main heating furnace 16, or main power PI is greater than the power of the single secondary heating units 17, or secondary powers P2.
- the power of the main heating furnace 16 is approximately 5-8 times the power of a single secondary heating unit 17.
- the main heating furnace 16 can have a main power PI of about 75kW and the individual secondary heating units 17 a secondary power P2 of about lOkW.
- the main heating furnace 16 can have a main power PI of about 50kW and the single secondary heating units 17 can have a secondary power P2 of about lOkW.
- the main heating furnace 16 can work at a main frequency FI of about 400- 500kHz and the single secondary heating units 17 can work with secondary frequencies of about 400kHz.
- the rolling apparatus 10 comprises temperature detection devices configured to detect the temperature of the metal product P.
- the rolling apparatus 10 also comprises a central unit which receives the temperature data from the temperature detection devices and manages the power and/or frequency of the main heating furnace 16 and of the secondary heating units 17, in order to maintain a constant temperature of the rolled product P regardless of its varying thickness.
- a reduction in the thickness of the metal product P corresponds to a different distribution of the thermal load to be imposed in order to keep its temperature constant.
- the rolling is advantageously carried out at temperatures which are kept almost constant.
- the temperature and state of stress imposed on the metal are such as to lead to a rapid recrystallization during the process (dynamic recrystallization) in order to prevent the establishment of a state of hardening of the metal.
- Recrystallization replaces the crystal structure with deformed grains with a new series of grains free from stresses and distortions.
- the work temperature Tw chosen is in a range comprised between about 700°C-800°C up to about 1200°C.
- the rollers 13 are made of special materials with low thermal conductivity so as to reduce as much as possible the heat released by the metal product P during working.
- low thermal conductivity we mean a range comprised between about 1 W nr’ K -1 and about 2 W-m _1 K _1 .
- the rollers 13 can be made with sintered materials, for example sintered ceramic alloys with low thermal conductivity.
- the rollers 13 are made of yttrium- stabilized zirconium oxide, which has a thermal conductivity of about 2 W rn ⁇ K 1 , integral or in the form of a compound through matrix and coating.
- the apparatus 10 comprises one or more reels 18 on which the metal products P in the form of wire rod are wound into coils.
- the reels can be of different types on the basis of the weight of the coils to be produced and/or the temperatures at exit from the rolling process.
- a winding device 19 Downstream of the last rolling unit 11 there is a winding device 19 configured to receive the metal wire produced and wind it into coils.
- the rolling of the metal product P can occur in a controlled atmosphere with noble gases, for example Argon or Nitrogen.
- noble gases for example Argon or Nitrogen.
- Some embodiments described here also concern a method for rolling a metal product P.
- the method provides to make the metal product P available in the form of wire rod having an initial thickness Si comprised between about 3mm and about 8mm.
- the method also provides to continuously feed the metal product P through the plurality of rolling units 11 disposed aligned along the work axis X of the metal product P, which carry out a reduction in 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 5mm.
- the metal product P before the metal product P is fed through the first rolling unit 11 , the metal product P is made to pass through a main heating furnace 16 which takes the metal product P from the ambient temperature Ta to a suitable work temperature Tw. Furthermore, when it is fed between one rolling unit 11 and the next, the metal product P is made to pass through the secondary heating units 16 which take the metal product P back to the work temperature Tw.
- the metal product P is initially in the form of wire rod and is wound on one or more coils disposed on respective reels 18.
- the metal product P, which enters in the form of wire rod, is unwound, straightened and introduced, for example by means of suitable drawing rollers, into the main heating furnace 16.
- the metal product P passes through the rolling units 11 in a continuous manner, inside each of which the thickness of the metal product P is decreased by a percentage reduction pitch R comprised between 58% and 75%, more in particular comprised between about 60% and about 68%.
- the path through which the metal product P passes inside the main heating furnace 16 and the secondary heating units 17 is straight and the pull control, determining the sliding value, is controlled with an electronic system in such a way as to increase the residence time between the rolling units 11, while maintaining the feeding speed unchanged.
- the metal product follows a zigzag shaped path.
- the rolling apparatus 10 also comprises an automatic device for unloading the coil of rolled product P.
- the coil is extracted from the rolling apparatus 10 and cooled in still air to complete the metallurgical transformation (stress relieving). The cooling of the extracted coil occurs while the apparatus continues to work on the next metal product P.
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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
Description
Claims
Priority Applications (3)
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EP22720519.2A EP4313436A1 (en) | 2021-04-01 | 2022-04-01 | Apparatus and method for rolling a metal product |
CN202280039696.1A CN117425532A (en) | 2021-04-01 | 2022-04-01 | Device and method for rolling metal products |
KR1020237037799A KR20230164726A (en) | 2021-04-01 | 2022-04-01 | Apparatus and method for rolling metal products |
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IT102021000008258 | 2021-04-01 | ||
IT102021000008258A IT202100008258A1 (en) | 2021-04-01 | 2021-04-01 | APPARATUS AND PROCEDURE FOR ROLLING A METALLIC PRODUCT |
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WO2022208568A1 true WO2022208568A1 (en) | 2022-10-06 |
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PCT/IT2022/050080 WO2022208568A1 (en) | 2021-04-01 | 2022-04-01 | Apparatus and method for rolling a metal product |
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EP (1) | EP4313436A1 (en) |
KR (1) | KR20230164726A (en) |
CN (1) | CN117425532A (en) |
IT (1) | IT202100008258A1 (en) |
WO (1) | WO2022208568A1 (en) |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01299702A (en) * | 1988-05-25 | 1989-12-04 | Hitachi Ltd | Method and device for warm rolling |
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 |
US20040016478A1 (en) * | 2002-07-25 | 2004-01-29 | David Sharpe | Inductive heating process control of continuous cast metallic sheets |
EP2554281A1 (en) * | 2011-08-01 | 2013-02-06 | Siemens Aktiengesellschaft | 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 |
EP2900036A1 (en) * | 2012-09-21 | 2015-07-29 | Nippon Steel & Sumitomo Metal Corporation | High-frequency induction heating device and processing device |
RU2681040C1 (en) * | 2017-02-17 | 2019-03-01 | Хермит Эдванст Технолоджиз ГмбХ | METHOD FOR MANUFACTURE OF (α+β)-TITANIUM ALLOY WIRE FOR ADDITIVE TECHNOLOGY WITH INDUCTION HEATING |
-
2021
- 2021-04-01 IT IT102021000008258A patent/IT202100008258A1/en unknown
-
2022
- 2022-04-01 KR KR1020237037799A patent/KR20230164726A/en unknown
- 2022-04-01 EP EP22720519.2A patent/EP4313436A1/en active Pending
- 2022-04-01 CN CN202280039696.1A patent/CN117425532A/en active Pending
- 2022-04-01 WO PCT/IT2022/050080 patent/WO2022208568A1/en active Application Filing
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01299702A (en) * | 1988-05-25 | 1989-12-04 | Hitachi Ltd | Method and device for warm rolling |
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 |
US20040016478A1 (en) * | 2002-07-25 | 2004-01-29 | David Sharpe | Inductive heating process control of continuous cast metallic sheets |
EP2554281A1 (en) * | 2011-08-01 | 2013-02-06 | Siemens Aktiengesellschaft | 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 |
EP2900036A1 (en) * | 2012-09-21 | 2015-07-29 | Nippon Steel & Sumitomo Metal Corporation | High-frequency induction heating device and processing device |
RU2681040C1 (en) * | 2017-02-17 | 2019-03-01 | Хермит Эдванст Технолоджиз ГмбХ | METHOD FOR MANUFACTURE OF (α+β)-TITANIUM ALLOY WIRE FOR ADDITIVE TECHNOLOGY WITH INDUCTION HEATING |
Also Published As
Publication number | Publication date |
---|---|
KR20230164726A (en) | 2023-12-04 |
CN117425532A (en) | 2024-01-19 |
IT202100008258A1 (en) | 2022-10-01 |
EP4313436A1 (en) | 2024-02-07 |
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