EP4412777A1 - Verfahren zum dressieren eines stahlblechs, dressiertes stahlblech und daraus hergestelltes bauteil - Google Patents
Verfahren zum dressieren eines stahlblechs, dressiertes stahlblech und daraus hergestelltes bauteilInfo
- Publication number
- EP4412777A1 EP4412777A1 EP22799875.4A EP22799875A EP4412777A1 EP 4412777 A1 EP4412777 A1 EP 4412777A1 EP 22799875 A EP22799875 A EP 22799875A EP 4412777 A1 EP4412777 A1 EP 4412777A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- steel sheet
- skin
- component
- rpc
- passing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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
- B21B1/22—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 plates, strips, bands or sheets of indefinite length
- B21B1/227—Surface roughening or texturing
-
- 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
- B21B1/38—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 sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
- B21B2001/383—Cladded or coated products
Definitions
- the invention relates to a method for skin-passing a steel sheet, a skin-passed steel sheet, and a component produced therefrom.
- Skin-passing of steel plate uses two skin-pass rolls in a skin-pass mill, through which the steel plate is passed, so that the upper skin-pass roll acts on the top and lower skin-pass roll on the bottom of the steel plate, and the surfaces on the top and bottom of the steel plate depending on the texture imprint a corresponding structure on the skin-pass rollers.
- the pair of temper rolls is usually manufactured with the same texturing process and texture parameters in order to make the top and bottom of the steel sheet as uniform as possible.
- the same design of the topography of the top and bottom does not always meet the conditions and requirements of the subsequent processing at the OEM.
- the forming process is an example of an automobile manufacturer's process in which different stresses are placed on the sides of the sheet metal: - During the forming process, different stresses occur on the steel sheet in the different areas of the tool. Depending on the component, the demands on the friction behavior of the steel sheet in the locally stressed areas are different.
- the steel sheet is to be held in the flange area, for example, so that the steel sheet can be sufficiently stretched in the punch area, which can usually be up to 5%.
- the stretching should take place as uniformly as possible over the stamp in order to avoid localization or constriction, which can lead to crack formation.
- Such demands on the surface generally apply to all components where the flow of material is to be reduced in the flange area; and the phosphating process: -
- the bodywork goes through a cleaning/phosphating/painting line, where the bodywork can be dipped, sprayed or dipped and sprayed during cleaning and/or phosphating.
- topography of a steel sheet side usually represented by roughness parameters, therefore has a significant influence on the further processing properties.
- Rougher topographies have a positive effect on the reactivity of the surface in the cleaning and bonding process.
- rougher surfaces usually have lower coefficients of friction because the oil retention capacity is improved. In order to be able to guarantee optimal results when forming or when phosphating sheet steel Z component surfaces, it could therefore make sense to provide the top and bottom of a sheet steel with different topographies.
- the object of the invention is therefore, in addition to a method for skin-passing a steel sheet, also to specify a skin-passed steel sheet in order to enable different configurations of the upper and lower sides of the steel sheet, which have a positive effect on both the forming and the phosphating process.
- a first teaching of the invention relates to a method for skin-passing a steel sheet, the steel sheet being passed between two skin-passing rolls in a skin-passing stand, the first skin-passing roll acting on the upper side of the steel sheet and the second skin-passing roll on the underside of the steel sheet, and through the skin-passing one in each case
- Surface structure is embossed on the upper and lower side of the steel sheet, so that the surface structure on the upper side of the steel sheet differs from the surface structure on the lower side of the steel sheet in such a way that the structural parameters selected from the group comprising the arithmetic mean roughness value Ra, skewness Rsk, Peak number Rpc, peak-to-valley height Rz, developed interface ratio Sdr, contact area T and void volume L, of which the respective surface structures have a maximum relative deviation in comparison to one another, which are defined as follows:
- skin-pass rolls are used which have different textures and are able to produce different topographies on the top and bottom of the steel sheet, with at least one, in particular several or preferably all of the aforementioned conditions with regard to the setting of the different structural parameters must be met in order to be able to provide a positive effect on both the forming and the phosphating process in the subsequent process.
- the surface (positive form) of the skin-pass roller forms a surface structure through the action of force on the surface of the coated steel sheet in particular, which is thus only partially embossed in the surface (negative form) of the steel sheet.
- a defined surface topography on a skin-pass roll can be generated in particular by laser texturing.
- Methods and devices for producing laser-textured temper rolls are prior art, cf. EP 2 892 663 p.
- a deterministic or a pseudo-stochastic topography is preferably introduced into the surface of the skin-passing roll or the skin-passing roll blank by means of material removal by means of a laser.
- Deterministic surface topography/surface structure is to be understood as meaning recurring surface structures which have a defined shape and/or design, see also EP 2 892 663 B1.
- this also includes surfaces with a pseudo-stochastic appearance, which, however, are applied by means of a deterministic texturing process and are therefore composed of deterministic form elements.
- EDT methods known in the prior art are used to generate a stochastic surface topography on a skin-pass roller.
- the invention relates to a skin-coated steel sheet with a surface structure on the upper side and the lower side of the steel sheet, see above that the surface structure on the upper side of the steel sheet differs from the surface structure on the lower side of the steel sheet in such a way that the structural parameters selected from the group comprising the arithmetic average roughness Ra, skewness Rsk, peak number Rpc, surface roughness Rz, developed interface ratio Sdr, contact area T and Empty volume L, the respective surface structures have a maximum relative deviation in comparison to each other, which are defined as follows:
- Sheet steel is generally to be understood as meaning a flat steel product which can be provided in the form of sheet metal (sheet) or in the form of a blank (blank) or in strip form (steel strip).
- At least one side of the steel sheet has a deterministic surface structure.
- the top and bottom can each have a deterministic surface structure.
- one of the sides of the steel sheet can have a deterministic surface structure and the other side a stochastic surface structure, see for example EP 2 006 037 B1.
- the cut-off wavelength X GG is defined from DIN EN ISO 4288 (e.g. April 1998 edition), Item 7 Table 1, since an aperiodic profile with a roughness of the texture between 2 and 10 pm is assumed and thus an individual measurement section of 2. 5 mm, which thus corresponds to X GG , is required.
- a surface profile is to be understood as meaning a progression or a profile of the surface structure in section along a defined measuring section. The roughness profile is filtered from the surface profile, with long-wave components with a wavelength greater than 2.5 mm being cut off.
- the structure parameters Ra, Rsk, Rpc, Rz and Sdr can be determined or determined on skin-passed sheet steel, as specified in DIN EN ISO 4288.
- the contact area T results from the ratio of the surface area of depths and elevations per sheet steel side.
- the void volume L is the volume of depths per steel sheet side.
- T and L can be determined using confocal microscopy.
- the surface to be examined can be scanned with a lateral resolution of less than 3.3 pm, for example, and a height value can be assigned to each scanned point with a resolution of less than 150 nm in the z-direction, for example, so that the topography of the surface is measured by the scan .
- measurements are preferably carried out using confocal microscopy, in which case a measurement area of, for example, 4 ⁇ 4 mm 2 or larger can be considered.
- the determination of the structure parameters is state of the art. At least one of the conditions of the aforementioned structural parameters must be met. In particular, two or more conditions of the aforementioned structural parameters can also be met. Preferably, all of the conditions of the aforementioned structural parameters can be met.
- the calculation of the relative deviations in % results from the difference (amount) of the structure parameters of the upper and lower side normalized to the larger structure parameter.
- the relative deviation is determined from: I structure parameter small - structure parameter large I / structure parameter large.
- Sdr> 40% preferably Sdr> 50%, preferably Sdr> 60% and / or
- T> 15% preferably T> 20%, preferably? > 25% and/or
- the steel sheet skin-passed according to the invention can be uncoated or preferably coated. If the steel sheet is coated, the coating of the coated steel sheet includes a metallic coating.
- the steel sheet is coated with a zinc-based coating, which is applied by hot-dip coating, wherein in addition to zinc and unavoidable impurities, additional elements such as aluminum with a content of up to 5 wt .-% and / or magnesium with a Content of up to 5 wt .-% may be included in the coating.
- additional elements such as aluminum with a content of up to 5 wt .-% and / or magnesium with a Content of up to 5 wt .-% may be included in the coating.
- Steel sheets with zinc-based Coatings have very good cathodic protection against corrosion, which have been used in automobile construction for years. If improved protection against corrosion is provided, the coating additionally has magnesium with a content of at least 0.3% by weight, in particular at least 0.6% by weight, preferably at least 0.9% by weight.
- Aluminum can be present as an alternative or in addition to magnesium with a content of at least 0.1% by weight, in particular at least 0.3% by weight, in order, for example, to improve the bonding of the coating to the steel sheet and in particular the diffusion of iron from the steel sheet into the coating during a heat treatment of the coated steel sheet, so that, for example, good adhesive properties can be ensured.
- the thickness of the coating can be between 1.5 and 15 ⁇ m, in particular between 2 and 12 ⁇ m, preferably between 3 and 10 ⁇ m.
- Skin-passing when providing a steel sheet with a hot-dip coating usually takes place after the coating, ie a surface structure is embossed on the top and bottom of the steel sheet on the coated steel sheet.
- the steel sheet is coated with a zinc-based coating, which is applied by electrolytic coating.
- the thickness of the coating can be between 1.5 and 15 ⁇ m, in particular between 2 and 12 ⁇ m, preferably between 3 and 10 ⁇ m.
- Skin-passing when providing a steel sheet with a coating coated by means of electrolytic coating usually takes place before coating, ie a surface structure is embossed on the upper and lower side of the steel sheet on the uncoated steel sheet.
- the invention relates to a component with an outer side and an inner side, which is produced in particular from a steel sheet tempered according to the invention, the outer side having the higher value relative to the inner side has at least two, in particular at least one, preferably at least four, preferably at least five of the following structural parameters: Ra, Rsk, Rpc, Rz, Sdr, T and L.
- the invention relates to a component with an outer side and an inner side, which is produced in particular from a steel sheet tempered according to the invention, the outer side preferably having the lower value based on at least two, in particular at least one, preferably at least four, compared to the inner side has at least five of the following structural parameters: Ra, Rsk, Rpc, Rz, Sdr, T and L.
- Manufactured components such as shell parts or deep-drawn parts, have an outside and inside. It is to be understood here that the outside can be the visible side and the inside can be the side correspondingly turned away.
- Components according to the invention are therefore particularly preferably used in vehicle construction, so that the example of a component according to the invention, which is an outer skin part, can be used to illustrate which side is the outside, i.e. the visible side on the vehicle when installed.
- the inside is correspondingly turned away, pointing in the direction of the vehicle interior and is usually covered by add-on parts and is therefore not visible, for example in the case of moving parts such as doors and flaps, but also vehicle roofs, fenders, etc.
- the component is phosphated.
- the component is painted.
- deterministic surface structures react more sensitively to the amount of oil applied than stochastic surface structures. This is due to the fact that stochastic surface structures are generally characterized as open structures and have less steep surface profiles. In contrast, defined, deterministic surface structures usually show a closed structure with considerably steeper surface profiles. Therefore, the transition to reduced lubrication is more abrupt in deterministic surface structures than in stochastic surface structures, where this transition is more fluid. Below a specified limiting quantity of lubrication (limiting oil quantity), the coefficients of friction increase sharply with deterministic surface structures, since closed structures The medium (oil) is absorbed locally or more strongly bound in the lubricant pockets created in this way.
- deterministic surface structures or the targeted profile design it is possible to adjust the transition to insufficient lubrication.
- steel sheets With the invention and deterministic surface structures that are pronounced on at least one side, preferably on both sides, steel sheets can be produced which therefore also have different tribological properties on the top and bottom side of the steel sheet.
- a sheet steel according to the invention can be used particularly advantageously in sheet metal forming, since it can have coefficient of friction profiles that are adapted to the surface pressure in the different tool areas (stamp area vs. flange area). In this way, the tribological requirements made by a drawing process, for example, can be optimally met in these tool areas.
- the side on which the stamp acts can be the inside of the component, which compared to the outside, for example, has the lower value based on at least two, in particular at least one, preferably at least four, preferably at least five of the following structural parameters: Ra , Rsk, Rpc, Rz, Sdr, T and L.
- an extension of 3-5% in the area of the punch area is aimed for, with drawing tools with punches, dies or drawing rings and hold-down devices being used, for example.
- drawing tools with punches, dies or drawing rings and hold-down devices being used, for example.
- a low coefficient of friction in the area of the punch particularly in the area of the bottom of the punch, is advantageous, since in this way a uniform stretching of the material can be ensured.
- the sheet steel should be held in the flange area between the hold-down device and the die/drawing ring.
- a high coefficient of friction is again advantageous for this.
- the sheet steel according to the invention makes use of the fact that the sheet metal side facing the stamp is designed in such a way that the coefficient of friction in the area of the surface pressure prevailing there is as low as possible. In contrast, the sheet metal side facing away from the stamp is designed in such a way that the highest possible coefficient of friction is achieved. In this way it can be ensured that the material can be stretched out in the punch area and held in the flange area.
- pseudo-stochastic surface structures with repeating deterministic structures have a sheet metal topography that is more open than the deterministic surface structure and therefore have a relatively lower coefficient of friction in the area of low surface pressure.
- Open sheet metal topographies can also be advantageous for the wetting of aqueous process media, so that the effect of different topographies on the upper and lower side of the steel sheet or the component (e.g. deterministic surface structure on the outside and pseudo-stochastic surface structures on the inside) in the area of automotive pretreatment ( cleaning and phosphating) can have a positive effect. Similar to the forming process described above, the top and bottom sides of the steel sheet are treated differently in the pre-treatment process.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102021125889.8A DE102021125889A1 (de) | 2021-10-06 | 2021-10-06 | Verfahren zum Dressieren eines Stahlblechs, dressiertes Stahlblech und daraus hergestelltes Bauteil |
| PCT/EP2022/077116 WO2023057300A1 (de) | 2021-10-06 | 2022-09-29 | Verfahren zum dressieren eines stahlblechs, dressiertes stahlblech und daraus hergestelltes bauteil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4412777A1 true EP4412777A1 (de) | 2024-08-14 |
Family
ID=84053250
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP22799875.4A Pending EP4412777A1 (de) | 2021-10-06 | 2022-09-29 | Verfahren zum dressieren eines stahlblechs, dressiertes stahlblech und daraus hergestelltes bauteil |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20240390963A1 (de) |
| EP (1) | EP4412777A1 (de) |
| CN (1) | CN118176068A (de) |
| DE (1) | DE102021125889A1 (de) |
| WO (1) | WO2023057300A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4640327A1 (de) | 2024-04-26 | 2025-10-29 | ThyssenKrupp Steel Europe AG | Arbeitswalze für den einsatz in einem kaltwalzwerk und verfahren zum kaltwalzen eines flachmaterials, sowie ein kaltwalzwerk |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1413561A (fr) * | 1964-04-25 | 1965-10-08 | Opel Adam Ag | Tôles fines ou bandes laminées à froid ainsi qu'un procédé pour leur fabrication |
| DE1247251B (de) * | 1964-04-25 | 1967-08-17 | Opel Adam Ag | Ziehblech fuer Ziehteile |
| JP2900501B2 (ja) * | 1990-04-18 | 1999-06-02 | 日本鋼管株式会社 | 表裏面で粗さの異なる鋼板の製造方法 |
| ES2348815T3 (es) | 2007-06-22 | 2010-12-15 | Thyssenkrupp Steel Europe Ag | Producto plano de un material metalico, en particular de un material de acero, uso de un producto plano semejante asi como cilindro y procedimiento para la fabricacion de tales productos planos. |
| DE102012017703A1 (de) | 2012-09-07 | 2014-03-13 | Daetwyler Graphics Ag | Flachprodukt aus Metallwerkstoff, insbesondere einem Stahlwerkstoff, Verwendung eines solchen Flachprodukts sowie Walze und Verfahren zur Herstellung solcher Flachprodukte |
| KR102462210B1 (ko) * | 2014-10-09 | 2022-11-03 | 티센크루프 스틸 유럽 악티엔게젤샤프트 | 냉간 압연되고 재결정 어닐링된 평강 제품 및 평강 제품의 제조 방법 |
| DE102015101580B3 (de) * | 2015-02-04 | 2016-06-02 | Hydro Aluminium Rolled Products Gmbh | Verfahren und Vorrichtung zum Prägewalzen eines Bandes |
| EP3765649A1 (de) * | 2018-03-16 | 2021-01-20 | Tata Steel Nederland Technology B.V. | Metallisches substrat mit massgeschneiderten oberflächentexturen und verfahren zum aufbringen solcher texturen auf metallische substrate |
| DE102019214136A1 (de) * | 2019-09-17 | 2021-03-18 | Thyssenkrupp Steel Europe Ag | Stahlblech mit einer deterministischen Oberflächenstruktur |
| DE102020200326A1 (de) * | 2020-01-13 | 2021-07-15 | Thyssenkrupp Steel Europe Ag | Verfahren zur Herstellung eines oberflächenveredelten und oberflächenkonditionierten Stahlblechs |
| DE102020202171A1 (de) * | 2020-02-20 | 2021-08-26 | Thyssenkrupp Steel Europe Ag | Verfahren zur Herstellung eines oberflächenveredelten Stahlblechs und oberflächenveredeltes Stahlblech |
-
2021
- 2021-10-06 DE DE102021125889.8A patent/DE102021125889A1/de active Pending
-
2022
- 2022-09-29 EP EP22799875.4A patent/EP4412777A1/de active Pending
- 2022-09-29 US US18/696,630 patent/US20240390963A1/en active Pending
- 2022-09-29 CN CN202280067324.XA patent/CN118176068A/zh active Pending
- 2022-09-29 WO PCT/EP2022/077116 patent/WO2023057300A1/de not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| CN118176068A (zh) | 2024-06-11 |
| US20240390963A1 (en) | 2024-11-28 |
| DE102021125889A1 (de) | 2023-04-06 |
| WO2023057300A1 (de) | 2023-04-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP3416760B1 (de) | Dressierarbeitswalze, verfahren zum dressieren eines flachproduktes hiermit und flachprodukt hieraus | |
| EP4076777B1 (de) | Metallblech mit einer deterministischen oberflächenstruktur und verfahren zur herstellung eines umgeformten und lackierten blechbauteils | |
| EP4182099B1 (de) | Dressiertes stahlblech, dressierwalze sowie verfahren zur herstellung eines dressierten stahlbechs | |
| DE102019215051B4 (de) | Stahlblech mit einer deterministischen Oberflächenstruktur und Verfahren zur Herstellung des Stahlblechs mit einer deterministischen Oberflächenstruktur | |
| DE102019214136A1 (de) | Stahlblech mit einer deterministischen Oberflächenstruktur | |
| EP4031302B1 (de) | Stahlblech mit einer deterministischen oberflächenstruktur | |
| WO2021052809A1 (de) | Stahlblech mit einer deterministischen oberflächenstruktur | |
| EP4090785A1 (de) | Verfahren zur herstellung eines oberflächenveredelten und oberflächenkonditionierten stahlblechs | |
| EP4041467B1 (de) | Stahlblech mit einer deterministischen oberflächenstruktur sowie verfahren zu dessen herstellung | |
| WO2017144407A1 (de) | Walze, insbesondere dressierarbeitswalze, und dressiertes flachprodukt | |
| EP3408431B1 (de) | Aluminiumlegierungsband für klebstoffverbindung | |
| EP4412777A1 (de) | Verfahren zum dressieren eines stahlblechs, dressiertes stahlblech und daraus hergestelltes bauteil | |
| WO2015039762A1 (de) | Anorganische karbonat- basierende konversionssschicht auf verzinktem stahl | |
| EP4387779A1 (de) | Verfahren zum herstellen einer lasertexturierten dressierwalze, verfahren zum dressieren eines stahlblechs und entsprechend dressiertes stahlblech | |
| EP1991865A2 (de) | Verfahren und vorrichtung zur prüfung der qualität einer metallischen beschichtung | |
| EP4035788A1 (de) | Verfahren zum texturieren einer dressierwalze, dressierwalze und dressiertes stahlblech | |
| DE102019216338A1 (de) | Verfahren zur Oberflächenbearbeitung eines Bleches und oberflächenbearbeitetes Blech | |
| EP3997253B1 (de) | Verfahren zum herstellen eines blechproduktes | |
| WO2023006449A1 (de) | Metallblech mit einer deterministischen oberflächenstruktur | |
| EP4532786A1 (de) | Metallflachprodukt und bauteil daraus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: UNKNOWN |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE |
|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE |
|
| 17P | Request for examination filed |
Effective date: 20240229 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
| DAV | Request for validation of the european patent (deleted) | ||
| DAX | Request for extension of the european patent (deleted) | ||
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: EXAMINATION IS IN PROGRESS |
|
| 17Q | First examination report despatched |
Effective date: 20260102 |