EP3238791B1 - Methode zur behandlung einer gleitfläche eines gleitgeräts und das gleitgerät mit dieser gleitfläche - Google Patents

Methode zur behandlung einer gleitfläche eines gleitgeräts und das gleitgerät mit dieser gleitfläche Download PDF

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Publication number
EP3238791B1
EP3238791B1 EP17168228.9A EP17168228A EP3238791B1 EP 3238791 B1 EP3238791 B1 EP 3238791B1 EP 17168228 A EP17168228 A EP 17168228A EP 3238791 B1 EP3238791 B1 EP 3238791B1
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EP
European Patent Office
Prior art keywords
base
sliding
sliding surface
craters
zones
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.)
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Application number
EP17168228.9A
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English (en)
French (fr)
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EP3238791A1 (de
Inventor
Francesco Ripamonti
Paolo Maria Ossi
Mario Francesco Moro
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Penz Srl
Politecnico di Milano
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Penz Srl
Politecnico di Milano
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Priority to SI201730229T priority Critical patent/SI3238791T1/sl
Publication of EP3238791A1 publication Critical patent/EP3238791A1/de
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    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63C—SKATES; SKIS; ROLLER SKATES; DESIGN OR LAYOUT OF COURTS, RINKS OR THE LIKE
    • A63C5/00—Skis or snowboards
    • A63C5/04—Structure of the surface thereof
    • A63C5/0428—Other in-relief running soles
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63C—SKATES; SKIS; ROLLER SKATES; DESIGN OR LAYOUT OF COURTS, RINKS OR THE LIKE
    • A63C5/00—Skis or snowboards
    • A63C5/04—Structure of the surface thereof
    • A63C5/044—Structure of the surface thereof of the running sole

Definitions

  • the present invention concerns a method for treating a base for sliding apparatuses, for example skis or suchlike, used in winter sports for sliding on snow-covered ground or suchlike, including ground prepared with artificial snow and similar materials, which have high sliding properties.
  • the present invention also concerns a base for a sliding apparatus and the sliding apparatus itself, used in particular for winter sports.
  • sliding apparatus we mean, hereafter in the description, each of the skis used for sliding or gliding on snow-covered ground or suchlike.
  • the multi-layer structure that the sliding structure is made of is similar in most types of modern sliding apparatuses present on the market.
  • the individual layers can be made with different geometries and materials or a different composition of materials, in order to obtain the desired characteristics, for example in terms of flexibility and manageability of the apparatus.
  • the techniques for assembling and producing normal sliding apparatuses are also consolidated and used by most producers.
  • the sliding properties of the sliding apparatus are a fundamental feature for performance, both in competitive sport and also in terms of the manageability and usability of the apparatus.
  • the tribology of the base of the sliding apparatus can be influenced by various parameters, including, principally, the characteristics of the material or materials it is made of, the sliding surface and the treatment of the base able in general to reduce to a minimum the dynamic friction between base and snow.
  • EP 1 415 686 A1 discloses a process and apparatus for structuring the running sole of a snow sliding board like a ski or a snowboard, and corresponding sliding apparatus.
  • a roller is pressed against the running surface which is fitted with peripheral and free-rotating bodies, in a ball cage, which embosses the surface material.
  • the embossed surface is smoothed so that the displaced material from the embossed recesses is forced back into the running surface.
  • the sole shows a plurality of craters (recesses) and ridges (displaced material), but no working step or working process is carried out inside the craters. Moreover the dimensions of the recesses and of the ridges obtained by the displaced material are not specified.
  • US 2006/251486 A1 describes a method for machining the running surfaces of winter sports appliances such as skis or snowboards, in which a blank track is subjected to a machining process in order to obtain a predetermined surface microstructure, which improves the gliding ability.
  • a precisely defined and reproducible surface structure of the track is achieved in such a way that the machining process for producing the surface microstructure comprises a plastic deformation by a tool which is moved over a running surface of the track blank and is pressed with a predetermined force on the track blank in order to deform the same in a plastic manner. It does not describe any working step or working process carried out inside the depressions delimited by two elevations obtained by means of the tool.
  • the vertical dimension of the depression is approximately 0.015 mm.
  • the vertical dimension of the elevation is approximately 0.01 mm.
  • the total height is thus approximately 0.025 mm.
  • known ski apparatuses can have various problems regarding the wear of the materials, and therefore it often needs different and costly maintenance operations, both for the base and also the edges.
  • One purpose of the present invention is therefore to perfect an effective and precise method for treating a base for a sliding apparatus, in particular a sliding apparatus for sliding on snow-covered terrains, by means of which the base obtained has optimum sliding qualities on the snow and therefore by means of which the dynamic friction between the sliding apparatus in which it is installed and the snow-covered ground is reduced to a minimum.
  • Another purpose of the present invention is to perfect a method for treating a base for a sliding apparatus, in particular a sliding apparatus for sliding on snow-covered terrains, which allows to obtain a base and therefore in general a sliding apparatus which is durable and therefore in which the wear deriving from normal use is significantly reduced and which also requires minimum interventions in terms of maintenance compared with known bases and sliding apparatuses.
  • Another purpose of the present invention is to obtain a base for a sliding apparatus, in particular a sliding apparatus for snow-covered ground, which in its entirety is more efficient and performs better (greater precision in trajectories) compared with normal bases for sliding apparatuses known in the field.
  • Another purpose of the present invention is to obtain a sliding apparatus which is in its entirety is more efficient and long-lasting, and performs better in terms for example of precision in trajectories compared with known apparatuses.
  • 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.
  • a method for treating a base able to be used in a sliding apparatus and provided with at least a sliding surface comprises at least a first step of cutting the base by means of which a plurality of craters with a controlled depth and diameter are made on the sliding surface, and at least a second step of structuring and finishing the sliding surface in zones of the sliding surface defined inside the craters and in zones of the sliding surface defined between one crater and the other, so as to obtain a plurality of ridges distributed on the sliding surface of the base in the craters and between one crater and the other.
  • the craters have micrometric sizes and the ridges have nanometric sizes.
  • the craters are distributed in a preferably regular pattern on the sliding surface of the base.
  • the first cutting step is performed using a pulsed laser and allows to obtain craters of micrometric sizes.
  • the craters have a depth variable between about 0.5 ⁇ m and about 50 ⁇ m.
  • the craters have a diameter variable between about 5 ⁇ m and about 100 ⁇ m and preferably less than 50 ⁇ m.
  • the procedure for finishing and structuring the sliding surface is a nanostructuring procedure performed by an ionic erosion process on the sliding surface.
  • the invention also concerns a sliding base comprising at least a sliding surface.
  • a plurality of craters are made in the sliding surface having micrometric sizes, a controlled depth and diameter and a plurality of ridges having nanometric sizes and in zones of the sliding surface of the base inside the craters and in zones situated between one crater and the other.
  • the base is made by at least one layer of metal material or metal alloys.
  • the base can have a thickness variable between about 0.2 mm and about 0.8 mm.
  • the invention also concerns a sliding apparatus comprising a plurality of overlapping layers and at least one base provided with at least one sliding surface.
  • the sliding surface comprises a plurality of craters having micrometric sizes and having a controlled depth and diameter and a plurality of ridges having nanometric sizes and distributed in zones of the sliding surface of the base inside the craters and in zones situated between one crater and the other.
  • the sliding apparatus comprises edges made in a single piece with the base.
  • a sliding apparatus 10 comprises a structure in which can be distinguished, starting from the bottom, a series of overlapping layers of the desired thickness, that is to say: a sliding base 11; a layer 12 of glass fiber or carbon fiber located above the base 11 and made for example of cross-laminated glass; a layer 13 of glass fiber or carbon fiber located above layer 12, for example a layer of cross-laminated glass; a layer 14 with anti-vibration functions, made for example of rubber or suchlike; a central core 15, made for example of multi-layer wood; a layer 16 of glass fiber or carbon fiber, located above the central core 15 and made for example of unidirectional laminate; a layer 17 of glass fiber or carbon fiber located above layer 16 and made for example of cross-laminated glass; another layer 18 with anti-vibration functions, made of rubber or suchlike for example; and an upper layer 19, preferably made of plastic material, for example with a base of thermoplastic polymers.
  • a sidewall 20 is also positioned, made for example of thermoplastic material, such as acrylonitrile-butadiene-styrene (ABS) or suchlike.
  • ABS acrylonitrile-butadiene-styrene
  • the base 11 of the sliding apparatus 10 which comprises a sliding surface 21 preferably made of metal material, integrates in a single piece the edges normally provided in any sliding apparatus and is produced starting from a strip with a thickness comprised between 0.2 and 0.8 mm for example, which therefore represents the thickness of the base 11.
  • materials for the basic strip from which the base 11 is obtained with standard cutting methods it is possible to use different types of metal materials, for example a first alloy with the commercial name of Titanal®, which is substantially an aluminum alloy, or stainless steel INOX AISI 301, which gives a better mechanical performance, or other metal materials, also combined with each other.
  • a first alloy with the commercial name of Titanal® which is substantially an aluminum alloy
  • stainless steel INOX AISI 301 which gives a better mechanical performance
  • other metal materials also combined with each other.
  • the strip is cut and shaped using a method similar to that used for conventional bases made of polymer such as UHMWPE (Ultra High Molecular Weight Polyethylene), then integrated into the sliding apparatus 10 using operations such as for example hot gluing and pressing.
  • UHMWPE Ultra High Molecular Weight Polyethylene
  • a hierarchical structuring is prepared, which provides for example a nano and microscopic control of the surface of the base 11.
  • the hierarchical structuring step is preferably divided into two working steps.
  • a cutting process is made on the sliding surface 21, for example with a pulsed laser (Laser Surface Texturing, LST), using a known machine and suitable for the purpose, for example equipped with a nanosecond laser, which currently represents a good compromise between efficiency and total working costs.
  • LST Pulser Surface Texturing
  • another type of laser could also be used, for example a femtosecond ultrafast laser.
  • the craters 22 obtained at the end of the first cutting step could be made using different techniques, for example by rollers provided with suitably sized indentations.
  • Each of the craters 22 will have a predetermined and controlled depth P and diameter D, so as to optimize the sliding performance and durability of the base 11 and hence of the sliding apparatus 10 in its entirety.
  • a depth P of the craters 22 which confers particular characteristics of slidability and efficiency on the base 11 applicable to the sliding apparatus 10 varies from about 0.5 ⁇ m to about 50 ⁇ m.
  • a diameter D of the craters 22 which confers particular characteristics of slidability and efficiency on the base 11 applicable to the sliding apparatus 10 varies from about 5 ⁇ m and about 100 ⁇ m and is preferably less than 50 ⁇ m.
  • these values of the depth P and diameter D of the craters 22 can be modified according to the technical characteristics and the type of sliding apparatus 10 to be obtained, depending for example whether it is used for Alpine skiing, cross country or other disciplines. Moreover, the parameters must also take into account the conditions of morphological variability of the snow cover.
  • the sliding surface 21 is covered by craters 22 disposed preferably in an orderly manner and a regular pattern 23, so as to guarantee a uniform treatment of the sliding surface 21 of the base 11.
  • the craters 22 distributed in a regular pattern 23 are shown only in a circled zone of the sliding surface 21 of the base 11; however, preferably, the regular pattern 23 of craters 22 will be made uniformly over the whole sliding surface 21 of the base 11.
  • the first laser working step it may be provided to smooth the base 11, to remove the flashes associated with the first working step.
  • the second step of finishing and structuring is begun, comprising a nanostructuring of the sliding surface 21.
  • the operation to nanostructure the sliding surface 21 takes place both in zones of the sliding surface 21 comprised inside the craters 22, and also in zones of the sliding surface 21 outside the craters 22, that is, defined between one crater and the other.
  • the purpose of this process is substantially to make a series of ridges 24, preferably of nanometric size, which are disposed inside and around each crater 22, uniformly, as shown schematically in fig. 4 and as shown by the image in fig. 6 .
  • the finishing and nanostructuring operation can be performed by an ionic erosion process, where the target consists of the base 11 and in particular its sliding surface 21.
  • the target is inserted in an environment where a vacuum has been created and it is subjected to a bombardment of ions, for example argon ions, so that the surface atoms of the material it consists of, in this case the sliding surface 21, are expelled.
  • ions for example argon ions
  • the ionic erosion process can be performed by passive devices able to generate magnetic fields, by means of radiofrequency, or by maintaining a continuous current inside the vacuum environment where the target is positioned, hence the base 11 with its sliding surface 21.
  • radiofrequency in the case of radiofrequency ionic erosion, the values of radiofrequency can be 13.56 MHz, as per international standards.
  • the pressure of the atmosphere inside the environment where the target is positioned, i.e. the sliding surface 21 of the base 11, is controlled in the range of tens of Pa, if necessary, starting from a reference vacuum in the range of 10 -4 Pa.
  • the ionic erosion power varies according to the metal or metal alloy that the base 11 is made of, and can vary for example between 50 W and 125 W.
  • the nanostructuring process through ionic erosion can be carried out in a plurality of different steps, separated by pauses. Indeed it has been found that dividing the ionic erosion process into different steps allows to obtain a better nanostructuring of the sliding surface 21.
  • each of them can have a predetermined duration of about 10 minutes.
  • the intervals between one ionic erosion step and the next can also have a duration of about 10 minutes.
  • a base 11 is obtained which is preferably treated with the operations as described above over the whole width of the sliding surface 21.
  • the sliding apparatus 10 on which the base 11 will be mounted will have the edges made in a single piece, that is, integrated with the base 11.
  • the base according to the present invention both when made of Titanal® and when made of INOX AISI 301, has irrefutable advantages both in terms of initial acceleration and in terms of travel compared with known bases made of polyethylene.
  • Solution Initial acceleration Travel time Titanal® vs polyethylene +15.9% -7.1% AISI301 vs polyethylene +14.8% -5.1%

Landscapes

  • Sliding-Contact Bearings (AREA)

Claims (11)

  1. Verfahren zur Behandlung einer Basis (11), die geeignet ist, in einem Gleitgerät (10) verwendet zu werden und mit mindestens einer Gleitfläche (21) ausgestattet ist, umfassend mindestens einen ersten Schritt des Einschneidens der Basis (11), wodurch eine Vielzahl an Kratern (22) auf der Gleitfläche (21) ausgebildet wird, wobei die Krater (22) mikrometrische Größen aufweisen und eine festgelegte Tiefe (P) und einen festgelegten Durchmesser (D) aufweisen, und mindestens einen zweiten Schritt der Strukturierung und der Endbearbeitung der Gleitfläche (21) in Bereichen der Gleitfläche (21), die innerhalb der Krater (22) definiert werden, und in Bereichen der Gleitfläche (21), die zwischen einem Krater (22) und dem anderen definiert werden, so dass eine Vielzahl an Graten (24), welche nanometrische Größen aufweisen und auf der Gleitfläche (21) der Basis (11) verteilt sind, in den Kratern (22) und zwischen einem Krater (22) und dem anderen erhalten wird.
  2. Verfahren gemäß Anspruch 1, dadurch gekennzeichnet, dass am Ende des ersten Einschneideschritts die Krater (22) in einem vorzugsweise gleichmäßigen Muster (23) auf der Gleitfläche (21) der Basis (11) verteilt sind.
  3. Verfahren gemäß irgendeinem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der erste Einschneideschritt unter Verwendung eines gepulsten Lasers durchgeführt wird.
  4. Verfahren gemäß irgendeinem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Krater (22) eine variable Tiefe (P) zwischen etwa 0,5 µm und etwa 50 µm aufweisen.
  5. Verfahren gemäß irgendeinem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Krater (22) einen variablen Durchmesser (D) zwischen etwa 5 µm und etwa 100 µm und vorzugsweise von weniger als 50 µm aufweisen.
  6. Verfahren gemäß irgendeinem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Endbearbeitungs- und Strukturierungsverfahren auf der Gleitfläche (21) ein Nanostrukturierungsverfahren ist, das durch einen ionischen Erosionsprozess auf der Gleitfläche (21) durchgeführt wird.
  7. Gleitbasis umfassend mindestens eine Gleitfläche (21), wobei die Gleitfläche (21) eine Vielzahl an Kratern (22) umfasst, welche mikrometrische Größen aufweisen und festgelegte Tiefen (P) und Durchmesser (D) aufweisen, und eine Vielzahl an Graten (24) umfasst, welche nanometrische Größen aufweisen und in Bereichen der Gleitfläche (21) der Basis (11) innerhalb der Krater (22) und in Zonen, die zwischen einem Krater (22) und dem anderen gelegen sind, verteilt sind.
  8. Basis gemäß Anspruch 7, dadurch gekennzeichnet, dass die Basis (11) aus mindestens einer Schicht eines Metallmaterials oder Metalllegierungen gefertigt ist.
  9. Basis gemäß Anspruch 7 oder 8, dadurch gekennzeichnet, dass die Basis (11) eine Dicke zwischen etwa 0,2 mm und etwa 0,8 mm aufweist.
  10. Gleitgerät umfassend eine Vielzahl an sich überlagernden Schichten (12-19) und mindestens eine Basis (11), die mit mindestens einer Gleitfläche (21) ausgestattet ist, wobei die Gleitfläche (21) eine Vielzahl an Kratern (22) umfasst, welche mikrometrische Größen aufweisen und festgelegte Tiefen (P) und Durchmesser (D) aufweisen, und eine Vielzahl an Graten (24) umfasst, welche nanometrische Größen aufweisen und in Bereichen der Gleitfläche (21) der Basis (11) innerhalb der Krater (22) und in Zonen, die zwischen einem Krater (22) und dem anderen gelegen sind, verteilt sind.
  11. Gleitgerät gemäß Anspruch 10, dadurch gekennzeichnet, dass es Kanten umfasst, die in einem Stück mit der Basis (11) gefertigt sind.
EP17168228.9A 2016-04-26 2017-04-26 Methode zur behandlung einer gleitfläche eines gleitgeräts und das gleitgerät mit dieser gleitfläche Active EP3238791B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI201730229T SI3238791T1 (sl) 2016-04-26 2017-04-26 Postopek za obdelavo drsne ploskve drsne naprave in drsna naprava, ki obsega tako drsno ploskev

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITUA2016A002890A ITUA20162890A1 (it) 2016-04-26 2016-04-26 Metodo di trattamento di una soletta per un'attrezzatura di scivolamento

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EP3238791A1 EP3238791A1 (de) 2017-11-01
EP3238791B1 true EP3238791B1 (de) 2020-01-15

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EP (1) EP3238791B1 (de)
IT (1) ITUA20162890A1 (de)
SI (1) SI3238791T1 (de)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020000181B3 (de) * 2020-01-27 2021-03-11 Thomas Wimmer Vorrichtung und Verfahren zur Bearbeitung von Gleitflächen

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2743500B1 (fr) * 1996-01-16 1998-03-27 Salomon Sa Planche de glisse comprenant une semelle de glisse munie d'empreintes d'alveoles
JPH09300002A (ja) * 1996-05-17 1997-11-25 Aluminum Co Of America <Alcoa> 圧延された光沢金属製品
JP2005537034A (ja) * 2001-06-23 2005-12-08 シュペート ベルント 表面特性を改善した本体
SI1415686T1 (en) * 2002-11-04 2005-10-31 Gst Global Sports Tech. Ges.M.B.H. Process and apparatus for structuring the running sole of a snow sliding board like a ski or a snowboard, and corresponding sliding apparatus
DE102005026097A1 (de) * 2004-05-27 2006-02-02 Gebrüder Plenk GmbH Langlaufskifabrik Bereichsweise Verwendung einer bei Alpin-Skiern bekannten Laufflächenform für Skating-Ski und Skating-Ski mit dieser Laufflächenform
AT502101B1 (de) * 2005-07-14 2007-09-15 Atomic Austria Gmbh Verfahren zur bearbeitung von laufflächen von wintersportgeräten sowie wintersportgerät und vorrichtung zur herstellung von belägen

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ITUA20162890A1 (it) 2017-10-26
EP3238791A1 (de) 2017-11-01

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