WO2023057674A1 - Método de optimización de la rugosidad de un cilindro de laminación mediante proyección térmica a alta velocidad - Google Patents
Método de optimización de la rugosidad de un cilindro de laminación mediante proyección térmica a alta velocidad Download PDFInfo
- Publication number
- WO2023057674A1 WO2023057674A1 PCT/ES2022/070627 ES2022070627W WO2023057674A1 WO 2023057674 A1 WO2023057674 A1 WO 2023057674A1 ES 2022070627 W ES2022070627 W ES 2022070627W WO 2023057674 A1 WO2023057674 A1 WO 2023057674A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- roughness
- cylinder
- speed
- powder
- granulometry
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000007751 thermal spraying Methods 0.000 title claims abstract description 10
- 238000003475 lamination Methods 0.000 title claims description 3
- 238000000576 coating method Methods 0.000 claims abstract description 39
- 239000011248 coating agent Substances 0.000 claims abstract description 32
- 239000000843 powder Substances 0.000 claims abstract description 32
- 238000001033 granulometry Methods 0.000 claims abstract description 20
- 239000000463 material Substances 0.000 claims abstract description 10
- 238000005507 spraying Methods 0.000 claims abstract description 8
- 235000019592 roughness Nutrition 0.000 claims description 84
- 238000005096 rolling process Methods 0.000 claims description 20
- 239000002245 particle Substances 0.000 claims description 18
- 239000000428 dust Substances 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 8
- 239000007921 spray Substances 0.000 claims description 8
- 238000010286 high velocity air fuel Methods 0.000 claims description 7
- 238000007749 high velocity oxygen fuel spraying Methods 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 2
- 238000004381 surface treatment Methods 0.000 claims description 2
- 238000010030 laminating Methods 0.000 claims 2
- 238000002679 ablation Methods 0.000 claims 1
- 230000008030 elimination Effects 0.000 claims 1
- 238000003379 elimination reaction Methods 0.000 claims 1
- 238000000151 deposition Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 12
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 8
- 238000011282 treatment Methods 0.000 description 7
- 238000005097 cold rolling Methods 0.000 description 6
- 235000019587 texture Nutrition 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 230000007423 decrease Effects 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000005422 blasting Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 238000011109 contamination Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 230000001934 delay Effects 0.000 description 2
- 238000010894 electron beam technology Methods 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 229910000684 Cobalt-chrome Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 241001655798 Taku Species 0.000 description 1
- 229910009043 WC-Co Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 239000010952 cobalt-chrome Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000012768 molten material Substances 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- RUDATBOHQWOJDD-UZVSRGJWSA-N ursodeoxycholic acid Chemical compound C([C@H]1C[C@@H]2O)[C@H](O)CC[C@]1(C)[C@@H]1[C@@H]2[C@@H]2CC[C@H]([C@@H](CCC(O)=O)C)[C@@]2(C)CC1 RUDATBOHQWOJDD-UZVSRGJWSA-N 0.000 description 1
Classifications
-
- 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
- B21B27/005—Rolls with a roughened or textured surface; Methods for making same
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
Definitions
- the present invention relates to a specially designed method for creating and optimizing roughness on coated work rolls using high speed thermal spray technology.
- These work rolls can be used for the production of sheet or coils in hot or cold rolling mills.
- the improvement of the service life of the work rolls is one of the main ways to reduce the operating costs of steel manufacturers.
- the roughness of the rolls must be uniform along the length of the roll and must meet the requirements in terms of mean roughness and standard deviation.
- the roughness of the roll affects the coefficient of friction between the strip and the rolls during rolling.
- the coefficient of friction increases as the roughness increases and at the same roughness the coefficient of friction increases as the number of peaks increases [1]
- Belt roughness affects the properties, quality and performance of the belt itself. As in the case of Skin-pass mills, to ensure good behavior during stamping, the roughness of the strip must be high enough to avoid cracks in the material.
- the roughness of the belt is transferred from the roughness of the work roll.
- the higher the roughness of the rolls the higher the roughness of the rolled strip.
- Rolling force and strip tension affect how roughness is transferred.
- the roughness of the work rolls is defined.
- steelmakers Based on the rolling process conditions and the target roughness of the strip, steelmakers define the roughness of the rolls.
- the arithmetic mean deviation of the roughness profile is defined as Ra.
- the calculation is made according to the ISO 4287 standard with a cut-off of 0.8 mm.
- RPC is defined as the number of spikes per unit length in centimeters. The calculation is made according to the standard ISO 4287 with a bandwidth of 1 micrometer.
- Table-1 shows typical values for the texture of working rolls.
- the decrease in roughness also depends on the type of texture used on the cylinders. See Fig.3 • As the initial roughness of the rolls is much higher than the roughness at the end of the rolling campaign, steelmakers regularly monitor the roughness of the rolls to prevent it from deviating from the range necessary to ensure the quality of the rolling surface. band. The cylinders are changed when the roughness is too low.
- Steel or cast iron shot with a specific granulometry, is projected onto the surface of the work cylinder.
- the kinetic energy of the particles is sufficient to produce a plastic deformation of the surface.
- the roughness obtained is a function of the mass and size of the shot, the speed of the shot, the hardness of the base material of the cylinder, the number of passes along the cylinder and the speed of rotation of the cylinder.
- the roughness is a function of the frequency, the voltage applied between the electrodes and the level of capacitance in the electronics. This technology is rarely used in cold rolling with a high reduction index since it is very sensitive to cylinder wear. This texture is currently the reference for Skin-pass and Temper trains.
- a laser beam strikes the surface of the cylinder melting the material and ejecting the material out of the crater created with the assistance of a gas (O2, CO2 or Ar).
- a gas O2, CO2 or Ar.
- the final texture of the cylinder corresponds to a uniform distribution of craters along a helical pitch on the circumference of the working cylinder.
- the axial distance of the craters is controlled by the speed of longitudinal movement of the cylinder. In the tangential direction, the distance of the craters is determined by both the speed of the cylinder and the speed of the mechanical shutter.
- the depth of the crater is determined by the power of the laser. This technology is not very commonly used today.
- This technology consists of bombarding a beam of electrons on the surface of the cylinder.
- the lenses focus the beam to preheat the cylinder material, then bombard the surface with a first shot to create a crater, and then heat the rim surrounding the crater.
- This cycle can be performed two or three times in the same spot to create a deeper crater.
- the beam is deflected to compensate for the continuous movement of the cylinder surface (displacement and rotation). This technology is only occasionally used for Skin-Pass trains, but it is not very commonly used today.
- Thermal spraying techniques are coating processes in which molten materials are sprayed onto a surface. A mixture of gases is burned in a combustion chamber, heating and accelerating a powder to deposit it on a substrate. If the oxidizing gas is oxygen, the thermal projection is called HVOF. If the oxidizer is air, the thermal projection is called HVAF.
- a rolling cylinder is produced with a coating of tungsten carbide alloys where the coating is usually a single layer, with a thickness between 0.003 mm and 0.020 mm, affecting 100% of the surface of work.
- the alloy is preferably selected from: WC-CoCr, WC-N ⁇ Cr, WC-Co, WC-Ni or WC-CrC-N ⁇ .
- the permeability of the coating is in a range between 0% and 0.1%.
- the coating layer has a final hardness, between 1000 Hv and 1600 Hv.
- Patent WO2021148690 describes, in the case of HVAF technology, the use of tungsten carbide coatings for cold rolling rolls.
- the method of the invention consists of a method of coating a cylinder by thermal spraying of a powder by means of a spray column to form an isotropic roughness (Ra) on the surface of said cylinder.
- the cylinder rotates at a speed (Vr) around its longitudinal axis and the projection column moves in translation at a speed (Vt), parallel to the axis of the cylinder to deposit the material according to a helical figure, so that in this method the following operational phases are established: a) establish a granulometry (G) of the powder to be projected, b) establish a target roughness (Ra) and a target thickness (t) of the coating, c) find the flow corresponding feed rate (Fr) of the powder in an empirical table presenting the target roughness (Ra) as a function of feed flow (Fr) and granulometry (G) according to the formula: where q is the efficiency of the process that depends on the type of equipment to be used and A
- the thermal projection method may be HVOF or HVAF projection.
- the projection dust will contain hard particles with dimensions less than 1 pm and in which the target final roughness (Ra) depends on the average granulometry of the dust (G).
- the number of peaks (RPc) of the coating surface must not exceed a value related to the roughness (Ra).
- Figure 2. Shows a graph related to the evolution of roughness during the lamination process and how the use of coatings such as chrome delays the wear caused by friction between the band and the cylinder, where the ordinate axis represents the roughness of the surface in microns, and the abscissa axis the strip length in kilometers, and where the lower curve represents the behavior of a steel cylinder forged with 5% chrome (cylinder without coating), while the curve The top represents the behavior of a cylinder with an electroplated chrome or chrome silver coating.
- Figure 3. Shows a graph in which the decrease in roughness is represented as a function of rolled tons of sheet steel, depending on the type of texture used in the cylinders, specifically for four different textures.
- Figure 4.- Shows a schematic representation of the method of the invention, in which the cylinder (7) rotates at a controlled speed around its longitudinal axis (8) and the projection cone moves in translation, parallel to the axis of the cylinder to deposit the material according to a helical figure (10).
- Figure 5. Shows a graph in which the evolution of the arithmetic mean deviation of the roughness profile is represented as a function of the number of peaks per unit length in centimeters, where the upper curve corresponds to the maximum ratio of peaks and the curve below the minimum peak ratio.
- Figure 6. Shows a graph similar to that of figure 5, but corresponding to a comparison between the curves in a process without additional treatment and the curve corresponding to the additional treatment to reduce the peaks in the roughnesses below 2 microns.
- Figures 6.1 and 6.2.- Show a profile cut of the coating to measure the number of peaks and their relief, made using a tool specifically for this purpose.
- the ordinate axis reflects the size of the peaks in microns (considering as peaks both ridges as well as valleys) while the abscissa axis represents the length in microns of the profile.
- Figure 6.1 shows the profile without additional treatment and figure 6.2 an extreme case where all peak crests above 0.25 microns of the desired coating thickness have been removed for a specific case.
- the thickness (t) is closely related to the powder feed flow (Fr), as well as the tangential velocity of the piece (Vr) and the transverse velocity of the gun (Vt) according to the following formula: Equation-1
- N cylinder revolutions per minute
- Vt Traverse speed of the gun
- p Density of the powder
- Vr tangential velocity of the cylinder
- the ratio between the width of the projection cone (d) and the length of the step (p) between two turns of rotation must be greater than 1 (see Fig.4).
- Equation-2 Being: Process efficiency
- A(G) and B(G) are functions of the granulometry of the powder (G)
- the powder contains fine, hard particles (like WC) and a binder (usually a softer metal). This means that the particle size of the dust is greater than the sizes of the hard particles.
- a dust grain may contain more than one hard particle.
- Table-4 describes the thermal spray according to our invention compared to the standard roughness.
- Tabia-4 Comparison between the roughness by thermal projection and the standard stochastic.
- the powder size must be adapted, according to Table-5 to address different roughness ranges.
- the size of the hard particles can affect the final roughness of the coating by high speed spraying.
- patent JP09300008 advises adapting the hard particle size between 1 and 20 pm so that the roughness obtained is between 0.3 and 3 pm.
- the size of hard particles between 1 and 5 pm to obtain a roughness of about 0.3 pm.
- the duration of the rolling campaign increases. If the size of the hard particles is too large, the roughness of the roll increases again as the rolling progresses and this is due to the "wear" of the metal binder. To avoid this phenomenon, the size of the hard particles must be smaller. to 1 p.m.
- the HVAF or HVOF coating that contains hard particles considerably increases the service life of the cylinders. This means a large increase in the duration of the rolling campaign. For the standard duration of the campaign of rolling (non-coated rolls or chrome-plated rolls), roughness management is sufficient to avoid defects in the rolled strip. In case of coatings with hardness greater than 1000 Hv, the tests indicated that it is important to limit the level of the number of peaks in addition to the roughness. Based on [2]% of the flat area affects friction. One way to increase the contact surface is to decrease the number of peaks and/or round off the peaks.
- This surface treatment can be mechanical (shot blasting, polishing%), chemical, electrochemical or thermal (laser... ).
- shots blasting, polishing chemical, electrochemical or thermal
- the roughness peaks are eroded.
- the roughness and the total number of peaks are reduced (see Fig. 6, Fig. 6.1 and Fig.6.2).
- the way in which the peaks and roughness decrease depends on the type of final treatment to be carried out.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Plasma & Fusion (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Coating By Spraying Or Casting (AREA)
- Crushing And Grinding (AREA)
- Geometry (AREA)
- Metal Rolling (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020247011222A KR20240063132A (ko) | 2021-10-04 | 2022-10-03 | 고속 용사를 이용한 압연기 롤의 거칠기를 최적화하는 방법 |
CA3233504A CA3233504A1 (en) | 2021-10-04 | 2022-10-03 | Method for optimising the roughness of a rolling mill roll by means of high-speed thermal spraying |
CN202280067545.7A CN118076446A (zh) | 2021-10-04 | 2022-10-03 | 一种用于通过高速热喷涂优化轧制轧辊的粗糙度的方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES202130927A ES2938132B2 (es) | 2021-10-04 | 2021-10-04 | Método de optimización de la rugosidad de un cilindro de laminación mediante proyección térmica a alta velocidad |
ESP202130927 | 2021-10-04 |
Publications (1)
Publication Number | Publication Date |
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WO2023057674A1 true WO2023057674A1 (es) | 2023-04-13 |
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PCT/ES2022/070627 WO2023057674A1 (es) | 2021-10-04 | 2022-10-03 | Método de optimización de la rugosidad de un cilindro de laminación mediante proyección térmica a alta velocidad |
Country Status (5)
Country | Link |
---|---|
KR (1) | KR20240063132A (es) |
CN (1) | CN118076446A (es) |
CA (1) | CA3233504A1 (es) |
ES (1) | ES2938132B2 (es) |
WO (1) | WO2023057674A1 (es) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH09300008A (ja) | 1996-05-10 | 1997-11-25 | Fujikoo:Kk | 鋼板の調質圧延用ロール |
WO2005105362A1 (en) * | 2004-04-30 | 2005-11-10 | Sandvik Intellectual Property Ab | Method for joining dispersion-strengthened alloy |
JP2007084884A (ja) * | 2005-09-22 | 2007-04-05 | Fujikoo:Kk | ロールの製造方法及びこれを用いて製造したロール |
WO2017056519A1 (ja) * | 2015-09-28 | 2017-04-06 | 三島光産株式会社 | ロール及びその製造方法 |
WO2021148690A1 (es) | 2020-01-20 | 2021-07-29 | Mecanizacion Industrial Astillero, S.A. | Procedimiento de obtención de cilindros para laminación con un recubrimiento de aleaciones de carburo de tungsteno y cilindro obtenido |
-
2021
- 2021-10-04 ES ES202130927A patent/ES2938132B2/es active Active
-
2022
- 2022-10-03 CN CN202280067545.7A patent/CN118076446A/zh active Pending
- 2022-10-03 CA CA3233504A patent/CA3233504A1/en active Pending
- 2022-10-03 KR KR1020247011222A patent/KR20240063132A/ko active Search and Examination
- 2022-10-03 WO PCT/ES2022/070627 patent/WO2023057674A1/es active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH09300008A (ja) | 1996-05-10 | 1997-11-25 | Fujikoo:Kk | 鋼板の調質圧延用ロール |
WO2005105362A1 (en) * | 2004-04-30 | 2005-11-10 | Sandvik Intellectual Property Ab | Method for joining dispersion-strengthened alloy |
JP2007084884A (ja) * | 2005-09-22 | 2007-04-05 | Fujikoo:Kk | ロールの製造方法及びこれを用いて製造したロール |
WO2017056519A1 (ja) * | 2015-09-28 | 2017-04-06 | 三島光産株式会社 | ロール及びその製造方法 |
WO2021148690A1 (es) | 2020-01-20 | 2021-07-29 | Mecanizacion Industrial Astillero, S.A. | Procedimiento de obtención de cilindros para laminación con un recubrimiento de aleaciones de carburo de tungsteno y cilindro obtenido |
Non-Patent Citations (4)
Title |
---|
BILAL COLAK: "UDCS'19 Fourth International Iron and Steel Symposium", TEXTURING METHODS FOR COLD MILL WORK ROLLS |
HAIBO XIE: " Thesis of university of Wollongong.", THE RESEARCH ON EDGE CARCK OF COLD ROLLED THIN STRIP, 2011 |
HIROYASU YAMAMOTOMANSAKU SASAKITAKAHIRO KITAMURA: "Tetsu-to-Hagane", RELATIONS BETWEEN FRICTION COEFFICIENT AND ROLL SURFACE PROFILES, ROLLED SHEET CHARACTERISTICS IN COLD ROLLING OF STEEL SHEETS, vol. 95, no. 5, 2009 |
MITSUO HASHIMOTOTAKU TANAKATSUYOSHI INOUEMASAYUKI YAMASHITARYUROU KURAHASHIRYOZI TERAKADO4, EFFECT OF WORK ROLL TECHNOLOGY ON COLD MATERIALS ROLLING AND PROGRESS OF MANUFACTURING FUTURE DEVELOPMENTS IN JAPAN, vol. 42, no. 9, 2002, pages 982 - 989 |
Also Published As
Publication number | Publication date |
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ES2938132A1 (es) | 2023-04-04 |
KR20240063132A (ko) | 2024-05-10 |
CA3233504A1 (en) | 2023-04-13 |
CN118076446A (zh) | 2024-05-24 |
ES2938132B2 (es) | 2023-09-26 |
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