Field of the invention
[0001] This invention concerns the equipment for creating the micro-scoring on the underside
of skis, and refers in particular to a method for preparing the surface of a grindstone
which can carry out said micro-scoring operation.
State of the art
[0002] It is already common practice to apply micro-scoring to the underside of competition
skis, in order to define threads which favour the release of drops of water from under
the skis, thereby increasing the sliding qualities and improving the skier's performance.
[0003] The micro-scoring operation on the underside of the ski is carried out with special
machines, using a grindstone which has been prepared by carving its surface with a
diamond tool that removes chippings.
[0004] One version of the micro-scoring machine and a method of preparing the grindstone
are described in the patent request PC 97 A 000015, but there are also other machines
on the market which do the same operation.
[0005] For example, document WO 99/36227 A discloses a device for surface carving a grindstone
with a diamond tool, particularly for the micro-scoring of the underside of a ski,
when the latter is brought into contact with the grindstone, comprising means for
the creation of multistart helical threads, which criss-cross in such a way as to
define a pattern of various threads with predetermined angles and pitches. Said angles
and pitches of the threads can be set by varying the speed of the grindstone or of
the diamond tool. This document discloses a method according to the preamble of the
attached independent method claim 1.
[0006] Research has shown that, in order to achieve certain performance levels and the sliding
properties and speed that these require, it is necessary to use micro-scoring with
a pattern in which the discharge threads are inclined very steeply compared to the
sliding axis of the ski and, at the same time, have a very fine pitch. This problem
is irresolvable with current scoring techniques.
Aim and description of the invention
[0007] Meanwhile, it is the aim of this invention to resolve said problem in a practical
and efficient way, by means of a special carving of the grindstone in such a way as
to create this micro-scoring on the underside of the ski, with a very fine pitch which,
at the same time, is steeply inclined compared to the sliding axis of the skis.
[0008] The aim of this invention is achieved by a procedure which involves using a diamond
tool to cut a grindstone in such a way as to create multistart helical threads, which
criss-cross, thereby creating a pattern with many threads that will be reproduced
on the underside of a ski when it is brought into contact with the grindstone.
Brief description of the drawings
[0009] One possible version will be described below, with reference to the enclosed drawings,
in which:
Fig. 1 shows a grindstone and a diamond cutting tool, ready in position to carve the
grindstone; and
Figs 2 to 6 show successive phases of the procedure for obtaining the desired carving.
Detailed description of the invention
[0010] For each figure, number 11 indicates a grindstone and number 12 a diamond tool for
surface carving the grindstone by means of removing chippings while it rotates with
respect to the tool, in the direction of the arrow R.
[0011] The carving operation described here refers to the creation of the first three threads,
referred to here as the "mother threads", and of a similar number of secondary threads,
referred to as "splitting threads", which criss-cross the mother threads. However,
it is understood that the procedure is also similarly applicable to the creation of
other thread quantities.
[0012] First of all, the mother threads are created, one at a time. With the start of the
first mother thread, an axis "01" is memorised - Fig 1 - as the point in which the
cutting tool 12 starts to attack the surface of the grindstone 11 to be carved.
[0013] Then the first mother thread is created, rotating the grindstone and moving the tool
laterally to it, as required.
[0014] Once the first mother thread is completed, the tool is detached from the grindstone
and the latter is made to rotate on its axis at a pre-determined angle α - Fig. 2
- in order to bring a second point "02" on the surface of the grindstone 11 into line
with the tool. Then the tool is used to carry out a second mother thread, starting
from point "02" on the grindstone, whilst the latter rotates and the tool is moved
sideways according to the pre-determined pitch.
[0015] Similarly, once the second mother thread has been finished, the tool is removed from
the grindstone and the latter is made to rotate on its axis, at a pre-determined angle
β - Fig. 3 - with respect to point "02", thereby creating a third point "03" to which
the utensil will be applied for the creation of another thread. A third mother thread
is then created in such a way that the surface of the grindstone will have three threads,
which may be equidistant or not according to the angles α and β through which the
grindstone has rotated between points "01" and "02" and between points "02" and "03".
[0016] Having executed the mother threads one at a time, the grindstone is rotated to a
new starting point "001", for the creation of the splitting threads. This new starting
point "001" may coincide with point "01" of the first mother thread or it may be in
line with another part of the grindstone surface. Then, starting from said point "001"
- Fig. 4, the cutting tool is used to execute a first splitting thread, rotating the
grindstone constantly in the direction R and moving the tool across the grindstone
with the appropriate movement and with the chosen pitch.
[0017] Once the first splitting thread has been made, the tool is detached and the grindstone
is rotated on its axis by an angle α', thereby establishing point "002" - Fig. 5 -
as starting point for making the second splitting thread with the cutting tool.
[0018] Finally, once the second splitting thread has been finished, the tool is detached
from the grindstone and the latter is rotated by a further angle β', until a third
starting point "003" - Fig. 6 - is reached, from where the cutting tool can begin
cutting a third splitting thread.
[0019] These splitting threads criss-cross the mother threads and, together, form a pattern
of threads which can have a slope and pitch as needed and which, between them, define
on the surface a series of tooth hubs that will cut the underside of the ski when
it comes into contact with the grindstone, reproducing the corresponding pattern of
micro-scoring, producing, in particular, a scoring with a very fine pitch and at a
steep angle with respect to the sliding direction of the ski.
1. Method of surface carving a grindstone (11) with a diamond tool (12), particularly
for the micro-scoring of the underside of a ski, when the latter is brought into contact
with the grindstone, comprising the carving of the grindstone with a diamond tool
for the creation of multistart helical threads, which criss-cross in such a way as
to define a pattern of various threads with predetermined angles and pitches, defining
a series of tooth hobs between them,
characterised in that it consists of:
- the execution of a first mother thread by a cutting tool, starting from a first
point (01) on the grindstone surface;
- the execution of at least a second mother thread by the cutting tool, starting from
a second point (02) on the grindstone surface, located at an angle (α, β) from the
first starting point (01) of the first mother thread;
- the execution of a first splitting thread, criss-crossing said mother threads, by
the cutting tool, which moves from a starting point (001) on the grindstone surface;
and
- the execution of at least a second splitting thread, criss-crossing said mother
threads, with the cutting tool starting from a second point (002) on the grindstone
surface, located at an angle (α', β') from the first starting point (001) of the first
splitting thread.
2. Method according to claim 1, consisting of making three or more mother threads, starting
from the respective points, located at angles, and three or more splitting threads,
criss-crossing said mother threads.
3. Method according to claims 1 and 2, in which the starting points of the splitting
threads coincide with the starting points of the mother threads.
4. Method according to claims 1 and 2, in which the starting points of the splitting
threads are separate from the starting points of the mother threads
1. Verfahren zum Oberflächenschneiden einer Schleifscheibe (11) mit einem Diamantwerkzeug
(12), insbesondere für die Mikroriefen- bzw. Mikrokerbenbildung der Unterseite eines
Skis, wenn der letztgenannte in Kontakt mit der Schleifscheibe gebracht wird, umfassend
das Schneiden der Schleifscheibe mit einem Diamantwerkzeug zur Erzeugung von mehrgängigen
schraubenförmigen bzw. helikalen Windungen, die sich in einer derartigen Weise kreuzen,
dass ein Muster aus unterschiedlichen Windungen mit vorbestimmten Winkeln und Abständen
bzw. Ganghöhen definiert wird, die eine Reihe von Zahnfräsungen bzw. zahnartigen Vertiefungen
dazwischen definieren,
dadurch gekennzeichnet, dass es aus:
- dem Ausführen einer ersten Mutterwindung durch ein Schneidwerkzeug, beginnend von
einem ersten Punkt (01) auf der Schleifscheibenoberfläche,
- dem Ausführen mindestens einer zweiten Mutterwindung durch das Schneidwerkzeug,
beginnend von einem zweiten Punkt (02) auf der Schleifscheibenoberfläche, angeordnet
in einem Winkel (α, β) von dem ersten Ausgangspunkt (01) auf der ersten Mutterwindung,
- dem Ausführen einer ersten spaltenden bzw. teilenden Wirkung, welche die Mutterwindungen
kreuzt, durch das Schneidwerkzeugt, welches sich von einem Ausgangspunkt (001)auf
der Schleifscheiben-oberfläche bewegt, und
- dem Ausführen mindestens einer zweiten spaltenden bzw. teilenden Windung, welche
die Mutterwindungen kreuzt, wobei das Schneidwerkzeug von einem zweiten Punkt (002)
auf der Schleifscheibenoberfläche, angeordnet in einem Winkel (α, β) von dem ersten
Ausgangspunkt (001)der ersten spaltenden Windung, startet, besteht.
2. Verfahren nach Anspruch 1, bestehend aus dem Bilden von drei oder mehreren Mutterwindungen,
beginnend von den entsprechenden Punkten, die in Winkeln angeordnet sind, und drei
oder mehreren spaltenden Windungen, welche die Mutterwindungen kreuzen.
3. Verfahren nach Ansprüchen 1 und 2, wobei die Ausgangspunkte der spaltenden Windungen
mit den Ausgangspunkten der Mutterwindungen übereinstimmen.
4. Verfahren nach einem der Ansprüche 1 und 2, wobei die Ausgangspunkte der spaltenden
Windungen von den Ausgangspunkten der Mutterwindungen getrennt sind.
1. Méthode pour graver la surface d'une meule (11) au moyen d'un outil diamant (12) -
notamment en vue du microrainurage du dessous d'un ski - lorsque ce dernier est mis
en contact avec la meule, comprenant la gravure de la meule à l'aide d'un outil diamant
pour la création de fils hélicoïdaux en multipasses, lesquels s'entrecroisent de manière
à définir un modèle de fils différents selon des angles et avec des pas prédéterminés,
en établissant une série de crans entre ces derniers,
caractérisé par le fait que cette méthode consiste dans :
- l'exécution d'un premier fil mère à l'aide d'un outil de coupe, en partant d'un
premier point (01) sur la surface de la meule ;
- l'exécution d'au moins un second fil mère à l'aide de l'outil de coupe, en partant
d'un second point (02) sur la surface de la meule, situé selon un angle (α, β) par
rapport au premier point de départ (01) du premier fil mère ;
- l'exécution d'un premier fil séparé entrecroisant les fils mères, à l'aide de l'outil
de coupe, et partant d'un point de départ (001) situé sur la surface de la meule ;
et
- l'exécution d'au moins un second fil séparé entrecroisant les fils mères, à l'aide
de l'outil de coupe, à partir d'un second point (002) sur la surface de la meule,
situé selon un angle (α, β) par rapport au premier point de départ (001) du premier
fil séparé.
2. Méthode selon la revendication 1, consistant à fabriquer trois fils mères ou plus
à partir de leur point respectifs, situés en biais, et trois fils séparés ou plus
entrecroisant ces fils mères.
3. Méthode selon les revendications 1 et 2, dans laquelle les points de départ des fils
séparés coïncident avec les points de départ des fils mères.
4. Méthode selon les revendications 1 et 2, dans laquelle les points de départ des fils
séparés sont distincts des points de départ des fils mères.