NZ745632A - Vulcanized fibre grinding tool - Google Patents
Vulcanized fibre grinding tool Download PDFInfo
- Publication number
- NZ745632A NZ745632A NZ745632A NZ74563214A NZ745632A NZ 745632 A NZ745632 A NZ 745632A NZ 745632 A NZ745632 A NZ 745632A NZ 74563214 A NZ74563214 A NZ 74563214A NZ 745632 A NZ745632 A NZ 745632A
- Authority
- NZ
- New Zealand
- Prior art keywords
- grinding tool
- vulcanised fibre
- fibre grinding
- vulcanised
- end portion
- Prior art date
Links
- 229920002143 Vulcanized fibre Polymers 0.000 title abstract 3
- 239000000835 fiber Substances 0.000 claims abstract description 126
- 239000012790 adhesive layer Substances 0.000 claims abstract description 11
- 230000007423 decrease Effects 0.000 claims description 3
- 238000013021 overheating Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 14
- 239000003082 abrasive agent Substances 0.000 description 11
- 238000003754 machining Methods 0.000 description 8
- 238000010276 construction Methods 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 241000283073 Equus caballus Species 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 239000006061 abrasive grain Substances 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 239000006261 foam material Substances 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
- 229910001369 Brass Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- -1 ium Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
Landscapes
- Polishing Bodies And Polishing Tools (AREA)
Abstract
A vulcanized fibre grinding tool (1), comprising two vulcanized fibre grinding disks (2, 3) each having an inner side and an outer side. The inner side of the vulcanised fibre grinding discs are fully bonded to each other over an entire surface thereof by an adhesive layer (4). The outer side of each of the vulcanised fibre grinding discs including an abrasive. In a central region of the vulcanised fibre grinding tool, a driver element (8) embedded in the adhesive layer for the purpose of connecting the grinding tool to a mechanical drive. By use of the invention, the disadvantages of previous grinding devices are avoided, including the requirement for a backing pad, the need for additional fastening means and minimum setting angle, and the risk of overheating.
Description
ISED FIBRE GRINDING TOOL
The invention relates to a vulcanised fibre grinding tool.
Vulcanised fibre grinding discs come under coated abrasives
and are described in detail in DIN ISO 16057. It is
possible to use paper, fabric, polyester and fibre
(vulcanised fibre) as base materials for coated abrasives.
These base als enable the manufacture of grinding
tools with a uniform distribution of abrasive grains
comprising a wide variety of grain sizes and abrasives. Of
all the base materials that can be used, vulcanised fibre
is the one with the st strength and hardness.
Since the base material of the coated ve is flexible,
such abrasives are also called flexible abrasives. When
such grinding tools are used in sheet form, applications
which involve grinding with machines require the use of a
supporting base part, conventionally in the form of a socalled
backing pad, as standardised in DIN ISO 15636.
In contrast to this are grinding tools with a bonded grain,
also known as bonded abrasives, in which the abrasive
grains are embedded in a synthetic resin mass. These
ng tools are used in the form of grindstones and
grinding discs for shaping and ing the surfaces of
workpieces. Such grinding tools are rigid which, on the one
hand, makes it easier to generate a surface contour, but is
linked to the problem that relatively large fractions of
the abrasive grain can break away in uncontrolled ,
thereby resulting in an uneven grinding pattern on the
surface of the workpiece.
Vulcanised fibre grinding discs are very popular in
industrial applications because, of the coated abrasives,
they offer the best strength with good elasticity and are
therefore e for their relatively long service life,
good abrasion rate and very good grain adhesion. They are
particularly suitable for generating a uniform surface
structure on a workpiece. The hitherto known vulcanised
fibre grinding discs should be used with a backing pad, see
for example the instructions for use in the PFERD tool
manual, D 21, page 6/204 and 7/204. The PFERD tool manual,
D 21, can be obtained from the company August erg
GmbH & Co. KG, Marienheide, Germany.
Vulcanised fibre grinding discs can be constructed either
with a l hole according to form A2 – DIN ISO 16057 –
this is the style preferred in the USA – or with slots
arranged additionally in a star shape ing to form A1
– DIN ISO 16057; this is the style preferred in .
For vulcanised fibre grinding discs of this type, there are
essentially two known and popular systems for fastening the
grinding disc to a backing pad. Within Europe, it is more
common to place the vulcanised fibre grinding disc over a
threaded bolt, which projects beyond the backing pad on the
workpiece side, and to secure it with a disc-shaped
fastening element. Either the haped element itself
has an internal thread and is screwed directly to the bolt
or it is screwed on via a separate nut. To reduce damage to
the surface, the threaded bolt and fastening element are
arranged in a central depression in the backing pad, i.e.
they are “counter-sunk”. In an arrangement of this type,
the above-mentioned slots in the grinding disc are
ageous. This type of fastening is described in more
2014/003013
detail for example in GB 2 A1 and is known from the
manual Produkte und Preise [Products and Prices] 2008/2009
from LUKAS-ERZETT Vereinigte Schleif- und
Fräswerkzeugfabriken GmbH & Co. KG, Engelskirchen, Germany,
pages 246, 247, 251.
Within America, it is common to press or punch a threaded
steel ring centrally into the vulcanised fibre disc so that
the disc can be fastened to the g pad more quickly.
An arrangement of this type is described for example in US
169 A. The design with the central hole is
advantageous for this.
It is generally known that these tional methods for
fastening a grinding disc onto a backing pad require a
minimum setting angle of the grinding disc to the workpiece
of approximately 15o in order to prevent the fastening
element from coming into contact with the workpiece and to
ore prevent damage to the e of the workpiece,
see PFERD tool manual, D 21, page 6/204.
Since the conventional backing pads are made of rubber or a
sufficiently elastic rubber-like plastic material, there is
a risk, associated with their high abrasion rate, that the
vulcanised fibre discs will overheat. As a solution to
this, EP 1 741 515 A1 describes a backing pad which has a
plurality of cooling channels, which are intended to ensure
cooling of the grinding disc on the rear side. This
furthermore describes a quick-change holder for the disc on
the support pad, which comprises a special flange device
which should be adhered to the rear side of the grinding
disc, which is not provided with adhesive.
2014/003013
DE 20 2009 011470 U1 and DE10 2009 038583 A1 explain in
addition how the solution described in EP 1 741 515 A1 is
substantially suitable for fine machining using vulcanised
fibre grinding discs with a fine grain size. When coarse
grain sizes are used for rough grinding, there is a risk
that the support layer, i.e. the base material of the
vulcanised fibre grinding disc, will tear. As a solution,
it is proposed to provide a support pad consisting of glass
fibres which are impregnated with phenolic resin and
compressed in conventional manner and to fasten the
vulcanised fibre grinding disc to this support pad by means
of an adhesive layer, with the grinding disc projecting a
few etres beyond the support pad in a preferred
embodiment. On the rear side of the support pad, which
faces away from the grinding side, a metal ring should
furthermore be provided to receive a drive shaft of a drive
machine.
US 3,844,072 A discloses an elastic grinding tool which is
coated with an abrasive on both sides and comprises an
inner disc made of plastic or metal to which there is
d, on each side, a respective disc made from a porous
foam material to which there is again adhered, on the
outside in each case, a further disc of a more solid
material to which there is y adhered, on the e
in each case, a grinding disc, for example of sandpaper.
The inner disc here comprises conventional connecting means
for tion to a machine. The grinding tool is said to
be rendered particularly useful through a simple turn of
the machine due to it being equipped with a grinding disc
on both sides. The elasticity is ed through the discs
being made of a porous foam material. The grinding tool
should be used on a machine shaft with a backing pad of
plastic material. It is further proposed, instead of a
construction comprising a plurality of disc-shaped layers,
to provide a stable plastic core made from a thermoplastic
and to coat this with a foam material on which the cover
layers are to be adhered for the purpose of receiving the
grinding discs. The use of a vely hard core is said
to eliminate the need for an al backing pad.
EP 0 450 209 B1 and DE 690 07 467 T2 disclose a flexible,
non-bonded double-sided disposable grinding disc for
rotatable connection to a supporting element. The grinding
disc disclosed therein is said to have a circular
reinforcing device in the form of an intermediate part
between the grinding surfaces, which defines a central
opening and has two opposing, substantially ar planar
surfaces. The grinding disc is intended to be removably
connectable to the supporting element by means of the
rcing device so that both grinding surfaces can be
used for finishing an . The device which can be
connected to the connecting device at one end of a
supporting element should advantageously have an
intermediate part which defines a central bore, is located
in the central g and is mounted on the reinforcing
device, with the central bore and the central opening being
l to one r. Alternatively, the rcing
device should have an intermediate part in the form of a
disc with two opposing, substantially planar surfaces, or
another similarly flat, planar element with two opposing,
substantially parallel, disc-supporting surfaces which have
a central bore. A first disc element should support an
abrasive material of a desired grain size on one side,
whilst a second opposing side of the disc should be
fastened to the disc-supporting surface by means of any
type of adhesive which is known in this context. A second
disc t, which has an abrasive material with a desired
grain size applied to one side, should be adherently
connected to the other disc-supporting surface of the
intermediate part to form a disposable grinding disc with
two grinding surfaces for grinding an object. The
intermediate part should ably be made from a man-made
fibre material or c material with a high strength or
a metal such as ium, steel, brass, copper etc. or a
similar material. It is said to be important that the
material selected for the intermediate part is of
sufficient strength to adequately secure the disposable
grinding disc during its exposure to the grinding forces.
The arrangement should optionally be used with an
additional supporting or reinforcing element made of rubber
or a similar material. It is particularly ageous if
ent specified grain sizes can be combined on both
sides of the grinding tool, which can then each be accessed
by turning the grinding disc.
DE 1 853 136 U describes a vulcanised fibre disc which is
coated with abrasive on both sides, although only a
radially outer region of the grinding disc is said to be
coated with the abrasive material. The disc should be
fastened in tional manner to the spindle of a machine
tool. The advantage is said to lie in a saving on material,
with the intention being that the disc is turned round on
the spindle for further use after the abrasive material on
one side has been used.
DE 20 2010 012 502 U1 discloses a grinding disc with a
plurality of holes for suctioning abrasive dust. The disc
is intended for use on a g pad in conventional
manner. The g pad here should have holes for
suctioning adhesive dust. The document bes a pattern
of radius lines and hole s with a particular
distribution of circular holes. The distribution of the
holes is intended to always attain a virtually uniform
suction performance irrespective of the relative rotatory
oning of the backing pad and grinding disc. This is
intended to prevent a time-consuming relative alignment of
the grinding disc and backing pad when the grinding discs
are changed rly.
Alternatively to this, A2 describes a
grinding disc for use with a likewise-described backing pad
for use on a grinding machine with a suction device,
wherein elongated holes or slots should be provided in the
grinding disc. The slots or elongated holes can also be
curved. The ted holes should have a uniform width
over their length. Furthermore, in the case of the linear
and curved elongated holes shown, the end centre points of
an elongated hole are located on a common radius line. As a
result of this proposed design of the suction holes in the
grinding disc, it should also be achieved that a virtually
uniform suction performance can always be realised
irrespective of the relative rotatory positioning of the
backing pad and grinding disc.
Various disadvantages when using vulcanised fibre grinding
discs, such as poor heat dissipation in the case of fine
grain sizes, the risk of tear when working with coarse
grain sizes, the need for a backing pad, a necessary
minimum setting angle when machining to prevent damage to
the e, the risk of contact between the workpiece and
the backing pad when ng narrow grooves and the
2014/003013
changeover time for the tool in relation to the operating
life for rial applications, have been treated in the
prior art and a plurality of possible solutions have been
proposed, which in turn are lly linked to new
problems or at least incur considerable costs. The object
on which the invention is based, ore, is to provide
an improved vulcanised fibre grinding tool which reduces
the disadvantages known from the prior art.
This object is achieved according to the invention by a
vulcanised fibre grinding tool having two vulcanised fibre
grinding discs, which are adhered to one another over the
entire surface by means of an adhesive layer arranged
between the vulcanised fibre grinding discs so that the
outer sides of the ised fibre grinding discs, which
are provided with the abrasive, face away from one another.
The applicant has discovered in surprising manner that,
with the inventive uction of a vulcanised fibre
grinding tool, the otherwise-established risk of the
vulcanised fibre grinding discs tearing is, as far as
possible, eliminated. Since the vulcanised fibre grinding
tool according to the invention can be used on both sides,
this resistance to tearing is achieved at much more
favourable expense when compared to the known solutions.
The solution according to the invention has shown itself in
further unexpected manner to be sufficiently stable without
the use of an additional g pad. By dispensing with a
te backing pad, the user is faced with lower overall
tool costs, and the weight when used on hand-held tools is
also lower. Dispensing with the additional backing pad
furthermore improves the dissipation of heat.
Finally, the solution according to the invention also
s the machining of surfaces in narrow grooves owing
to the omission of the backing pad and the very narrow
thickness. By means of the vulcanised fibre grinding tool
according to the invention, it is not only possible to
achieve substantially narrower s than with the known
tools, but the risk of a backing pad coming into contact
with a side of the groove, and therefore damaging the
workpiece, is also eliminated in the case of wider grooves.
The tool according to the invention can be fastened
exceptionally simply to a machine tool spindle by means of
a central hole in conventional manner, e.g. with a washer
and nut, and this therefore results in pure material waste
when the tool becomes worn. It is also possible to
furthermore embed a driver element in the adhesive layer in
a l region of the vulcanised fibre grinding tool to
achieve quicker fastening of the vulcanised fibre grinding
tool to a ical drive, in ular when the driver
element has a mounting surface for mounting the ised
fibre grinding tool on the mechanical drive, with the
driver element being of a depressed-centre design so that
the mounting surface is arranged y offset from a
longitudinal centre plane of the vulcanised fibre grinding
tool. This grinding tool according to the invention can
furthermore be positioned for grinding over its entire
surface on one side, which corresponds to a setting angle
of 0o. This is particularly simple if only one thread is
formed in the region of the mounting surface in the driver
t.
It can be advantageous, particularly in conjunction with
quick-change tool s, if a driver element is
furthermore arranged in a central region of the vulcanised
fibre grinding tool for the purpose of connecting the
vulcanised fibre grinding tool to a mechanical drive, in
which case the driver element reaches h the grinding
discs through a central hole and the adhered vulcanised
fibre grinding discs are fastened to the driver element.
In conjunction with established hand-held machine tools,
such as angle grinders, it is ageous for a quick and
simple tool change if a single- or multi-pitch screw thread
or internal thread is formed in the driver element.
In a further particularly advantageous embodiment of a
ng tool according to the invention, the grinding tool
has through holes arranged transversely to a longitudinal
centre plane of the vulcanised fibre grinding tool. These
holes enable the workpiece to be viewed during operation on
the one hand and e the dissipation of heat from the
workpiece surface on the other.
It is essentially known to provide ng tools with
cutouts or openings to allow a view of the machined
workpiece surface during machining of a workpiece. For
example, cutouts in flap discs are disclosed in DE 20 2004
004 027 U1, US 2005 0202 768 A1, US 2006 0160 480 A1 and DE
2005 009 665 U1. Unlike with vulcanised fibre grinding
discs, there is no need for a backing pad when using flap
discs. Flap discs are r type of grinding tool in
which individual abrasive sheets are adhered to a
supporting plate in overlapping manner.
In combinations of supporting plates or g pads with
grinding discs, the provision of holes in the grinding disc
and backing pad or supporting plate is described for
example in DE 29 802 791 U1, US 6 007 415 A, EP 0 868 262
B1, DE 696 11 764 T2, DE 699 07 280 T2, WO 00/35634 A and
WO 97/21521 A.
The Pferd D21 tool manual, page 43/204, describes grinding
discs and matching backing pads with holes. However, in
machines which are equipped accordingly, these holes are
intended to serve for ning abrasive dust during the
grinding process in order to delay the grinding disc in
becoming clogged.
All these described constructions having a backing pad are
particularly disadvantageous in that, when the grinding
disc is changed, the new grinding disc has to be positioned
with its holes in alignment with the holes in the support
plate or backing pad. Taking into account the constructions
in DE 20 2009 011 470 U1, in which the operating life of
such grinding discs in industrial applications is sometimes
less than a minute, the tool change times for the total
machining period take on extreme economic significance.
When compared to the known solutions, the uction
ing to the ion is linked to an enormous
ical advantage for the user of such a tool according
to the invention.
It is further known from DT 2 121 842 OS to provide cutouts
and slots in a grinding disc, in which the abrasive is
adhered to a thin metal support disc. The disc described is
said to be especially suitable for machine finishing
cutting tools. As a result of the cutouts and slots also
having a special design, a predetermined edge ng zone
is said to be formed which is intended to enable the disc
to be used le times with a d radius. It is
known from DT 1 652 912 OS to provide cutouts in grinding
discs, wherein the cutouts are to be restricted to an edge
region in which the grinding disc is not supported by a
backing pad.
For a better view of the workpiece surface, it is
advantageous if the through holes are located on one or
more hole circles arranged trically to an axis of
rotation of the vulcanised fibre grinding tool.
It has been shown to be particularly advantageous if the
through holes have an elongated form, with the length of
the through holes preferably being at least three times the
greatest width of the through holes, in particular if the
width of the elongated through holes decreases from a first
end portion of a through hole to a second end portion of
the h hole and the first end portion preferably has a
larger radial spacing from an axis of rotation of the
vulcanised fibre grinding tool than the second end portion.
This improves the view of the essential parts of the
workpiece surface to be machined on the one hand and at the
same time achieves an improved ation of heat from the
workpiece surface. The first end n and the second end
portion of a through hole here are preferably arranged on
different radius lines about the axis of rotation of the
vulcanised fibre ng tool. The angle formed here by
the radius lines of a through hole about the axis of
rotation in the longitudinal centre plane of the vulcanised
fibre grinding tool is particularly advantageously at least
30o, preferably not more than 60o.
In a further preferred embodiment, the grinding tool is
simply constructed as a segment-like part of a disc. This
s the grinding tool according to the invention to
also be particularly ageously combined with so-called
multi-tools, which have a rotatory oscillating drive for
the tool and are otherwise designed similarly to an angle
grinder, and to be used for precise surface machining.
The invention will be explained in more detail below with
nce to exemplary embodiments and with the aid of the
accompanying drawings, which show:
Fig. 1 a first embodiment of an inventive vulcanised
fibre grinding tool, in plan view;
Fig. 2 the inventive ised fibre grinding tool of
Figure 1, in cross-section;
Fig. 3 a second embodiment of an inventive vulcanised
fibre grinding tool, in plan view;
Fig. 4 the inventive vulcanised fibre grinding tool of
Figure 3, in cross-section;
Fig. 5 a third embodiment of an ive vulcanised
fibre grinding tool, in plan view;
Fig. 6 the ive vulcanised fibre grinding tool of
Figure 5, in cross-section;
Fig. 7 a fourth embodiment of an inventive vulcanised
fibre grinding tool, in plan view;
Fig. 8 the ive vulcanised fibre ng tool of
Figure 7, in cross-section;
Fig. 9 a fifth embodiment of an ive vulcanised
fibre grinding tool, in plan view;
Fig. 10 the inventive vulcanised fibre grinding tool of
Figure 9, in cross-section;
Fig. 11 a sixth embodiment of an inventive vulcanised
fibre grinding tool, in plan view;
Fig. 12 the inventive vulcanised fibre grinding tool of
Figure 11, in cross-section;
Fig. 13 a seventh embodiment of an inventive vulcanised
fibre grinding tool in plan view;
Fig. 14 the inventive vulcanised fibre grinding tool of
Figure 13 on an angle grinder;
Fig. 15 a further embodiment of an inventive vulcanised
fibre grinding tool as a segment-like part of a
disc; and
Fig. 16 a modification of the embodiment of an inventive
vulcanised fibre ng tool of Figure 15.
The inventive vulcanised fibre grinding disc illustrated in
the drawings is provided and designed to be driven in
rotatory or rotatory oscillating manner, for example for a
conventional angle r. The ive vulcanised fibre
grinding tool illustrated in the figures (denoted as a
whole by 1) comprises two vulcanised fibre grinding discs 2
and 3, which are provided with an abrasive at least on one
of their outer sides and are adhered to one another over
the entire surface by means of an adhesive layer 4 arranged
between the vulcanised fibre grinding discs 2, 3, so that
the outer sides of the vulcanised fibre grinding discs 2,
3, which are provided with the abrasive, face away from one
another. The adhesive layer 4 can be formed for example by
an epoxy resin based adhesive.
The first embodiment (shown in plan view in Figure 1 and in
cross-section in Figure 2) of a vulcanised fibre ng
tool 1 according to the invention can be fastened
exceptionally simply to a machine tool spindle 6 by means
of a central hole 5 in conventional manner, e.g. with a
washer and nut. This therefore results in pure material
waste when the tool 1 becomes worn, which means that
disposal is kept simple and disposal costs are therefore
kept low, particularly when used on an industrial scale.
The hole 5 is ageously designed as a hole with a
nominal diameter of 22.23 mm. As a result of the
symmetrical construction of the grinding tool 1, the
longitudinal centre plane 7 of the grinding tool 1 is
located in the ve layer 4.
As is y shown in Figure 4, that embodiment of a
grinding tool 1 according to the invention which is
illustrated in s 3 and 4 furthermore has, in a
central region of the vulcanised fibre grinding tool 1, a
driver element 8 embedded in the adhesive layer 4 for the
purpose of connecting the ised fibre grinding tool 1
to a mechanical drive, for example a e tool spindle 6
of an angle grinder 9, as shown in Figure 14. The driver
element 8 shown is advantageously manufactured as a metal
d part and has an M14 or 5/8-11” thread pitch 10
integrally formed therein, as is also clearly shown in
Figures 13 and 14. The grinding tool can ore be
screwed directly onto the machine tool spindle 6 of the
angle grinder 9, which shortens the tool change times
considerably and therefore improves the overall costeffectiveness
when using a grinding tool 1 according to the
invention.
A mounting surface 11 for mounting the vulcanised fibre
grinding tool 1 on the mechanical drive, for example on a
shaft collar or on a machine tool spindle 6 or a spacer
block, is furthermore constructed on the driver element 8.
To this end, the driver element 8 is of a depressed-centre
design so that the mounting surface 11 is arranged axially
offset from the longitudinal centre plane 7 of the
ised fibre grinding tool 1, as shown particularly
clearly in Figure 4. With an riately adapted thread
length of the machine tool spindle 6 or the use of suitable
spacer blocks so that the machine tool spindle 6 does not
project beyond the mounting surface 11 on the side of the
vulcanised fibre grinding tool 1 which is opposite this
mounting surface, the grinding tool 1 according to the
ion can be positioned for grinding over its entire
e on the side of the ised fibre ng tool 1
which is opposite to the mounting surface 11.
In the embodiment of an ive vulcanised fibre grinding
tool 1 shown in Figures 5 and 6, another driver element 12
is arranged in the central region of the vulcanised fibre
grinding tool 1 for the purpose of connecting the
vulcanised fibre grinding tool 1 to a mechanical drive 6.
This commercially available driver element 12 is adhered
and fixedly clamped to the vulcanised fibre discs. A
n bolt 15 is integrally formed on a hub body 13 for
the purpose of positioning a conventional tool when it is
fastened or released from a drive spindle 6. A singlepitch
, preferably pitch, screw thread or internal
thread is constructed in the hub body 13 as part of a
quick-change fastening of the grinding tool 1 on a drive
spindle 6.
Figures 7 to 12 show embodiments of a grinding tool 1
according to the invention, which correspond to those in
Figures 1 to 6 and which additionally have through holes 16
arranged transversely to the longitudinal centre plane 7 of
the vulcanised fibre grinding tool 1. The through holes 16
are located on one (Figures 7, 8, 11, 12) or more (Figures
9, 10) hole s 21 ed concentrically to an axis
of rotation 17 of the vulcanised fibre grinding tool 1. The
number of through holes 16 can be 2, 3, 4, 5, 6, 7, 8, 9 or
more, the through holes 16 should be arranged in a m
distribution to avoid an imbalance of the grinding tool 1.
In the embodiments of a grinding tool 1 ing to the
invention which are shown in Figures 13 and 14, the through
holes 16 have an elongated, drop-shaped, trailing form,
with the length of the through holes 16 preferably being at
least three times the greatest width of the through holes
16. The width of the elongated through holes 16 furthermore
decreases from a first end portion 18 of a h hole 16
to a second end portion 19 of the through hole 16. The
first end portion 18 has a larger radial spacing from the
axis of rotation 17 of the ised fibre grinding tool 1
than the second end portion 19. The through holes 16 of
WO 67377
these embodiments have a shape such as that often used to
illustrate a comet with a tail. As shown, the elongated
through holes 16 can have an sically curved
construction. The operator has a larger view of the total
machining surface than is the case with circular through
holes. It has proven advantageous for the end portion 18 to
be arranged closer to the outer edge of the vulcanised
fibre grinding tool 1 and the narrower second end portion
19 to be arranged closer to the axis of rotation 17. The
first end portion 18 and the second end portion 19 of a
h hole 16 are arranged here on different radius lines
22, 23 about the axis of rotation 17 of the vulcanised
fibre grinding tool 1. The angle α formed by the radius
lines 22, 23 of a through hole 16 about the axis of
rotation 17 in the longitudinal centre plane 7 of the
vulcanised fibre grinding tool 1 is at least 30o, preferably
not greater than 60o, in the ment shown approximately
40o to 45o.
s 15 and 16 show further embodiments of a vulcanised
fibre grinding tool 1 according to the invention, which is
constructed as a segment-like part 20 of a disc for use
with so-called multi-tools, which have a rotatory
oscillating drive for the tool 1 and are otherwise of a
similar design to an angle r 9 and can be used for
fine and precise surface machining. As a result of the
rotatory oscillating nt of the machine tool spindle
6, a driver element 14 with a form-fitting holder for the
machine tool spindle 6 is advantageous. A hexagonal hole,
as shown in Figure 15, or an octuple star, as shown in
Figure 16, enable the vulcanised fibre grinding tool 1 to
be connected to the machine tool spindle 6 in various basic
ons depending on the most expedient positioning of
the machine tool in on to the workpiece. Such a
vulcanised fibre grinding tool 1 in the form of a segment
can also have through holes 16 with the ages
described above. An embodiment of this type is shown in
Figure 16. It goes without saying that such a vulcanised
fibre grinding tool 1 with holes 16 in Figure 16 can also
be equipped with a driver element 14, as shown in Figure
, and vice versa. The through holes 16 can also have the
elongated form and the arrangement described with reference
to Figure 13.
List of reference symbols
1 Vulcanised fibre grinding tool, as a whole
2 Vulcanised fibre ng disc
3 Vulcanised fibre grinding disc
4 Adhesive layer
Central hole
6 Machine tool spindle
7 Longitudinal centre plane
8 Driver element
9 Angle r
Thread pitch
11 Mounting surface
12 Driver element
13 Hub body
14 Driver element
Hexagon bolt
16 Through hole
17 Axis of rotation
18 First end portion
19 Second end portion
Segment-like part
21 Hole circle
22 Radius line
23 Radius line
α Angle
Claims (16)
1. A vulcanised fibre grinding tool, comprising: two ised fibre ng discs, each having an inner side and an outer side, the inner side of each of the vulcanised fibre grinding discs being adhered to one another over an entire surface thereof by an adhesive layer arranged between the ised fibre ng discs, the outer side of each of the vulcanised fibre grinding discs, which face away from one another, including an abrasive, and further comprising a driver element embedded in the adhesive layer in a central region of the vulcanised fibre grinding tool for the purpose of connecting the vulcanised fibre grinding tool to a mechanical drive.
2. A vulcanised fibre grinding tool ing to Claim 1, wherein the driver element has a mounting surface for mounting the vulcanised fibre grinding tool on the mechanical drive, wherein the driver element is of a depressed-centre design so that the mounting surface is arranged y offset from a longitudinal centre plane of the vulcanised fibre ng tool.
3. A vulcanised fibre grinding tool according to Claim 1, further comprising a driver element arranged in a central region of the vulcanised fibre grinding tool for the purpose of ting the vulcanised fibre grinding tool to a mechanical drive, wherein the driver element reaches through the vulcanised fibre grinding discs through a central hole and the adhered vulcanised fibre grinding discs are fastened to the driver element.
4. A vulcanised fibre grinding tool according to any one of Claims 1 to 3, comprising a single- or multi-pitch screw thread or internal thread constructed in the driver element.
5. A vulcanised fibre grinding tool ing to any one of the preceding claims, wherein the vulcanised fibre grinding tool has through holes arranged transversely to a longitudinal centre plane of the vulcanised fibre grinding tool.
6. A vulcanised fibre grinding tool according to Claim 5, wherein the h holes are located on one or more hole circles arranged concentrically to an axis of rotation of the vulcanised fibre grinding tool.
7. A vulcanised fibre grinding tool according to Claim 5, wherein the through holes have an elongated haped form.
8. A vulcanised fibre grinding tool according to Claim 7, in which the length of the through holes is at least three times the greatest width of the through holes.
9. A ised fibre grinding tool according to Claim 7 or Claim 8, n each of the elongated through holes comprise a first end portion and a second end portion, and the first end portion has a larger radial distance from the axis of rotation of the vulcanised fibre grinding tool than the second end portion.
10. A ised fibre grinding tool ing to Claim 7 or Claim 8, wherein the width of the elongated through holes decreases from a first end portion of a through hole to a second end portion of the through hole.
11. A vulcanised fibre grinding tool according to any one of Claims 9 or 10, n the first end portion has a larger radial spacing from the axis of rotation of the ised fibre grinding tool than the second end portion.
12. A vulcanised fibre grinding tool according to Claim 11, wherein the first end portion and the second end portion of a through hole are arranged at different radius lines about the axis of rotation of the vulcanised fibre ng tool.
13. A vulcanised fibre grinding tool according to Claim 12, wherein an angle (α) which is formed by the radius lines of a through hole about the axis of rotation in the longitudinal centre plane of the vulcanised fibre grinding tool is at least 30o.
14. A vulcanised fibre grinding tool according to Claim 13, wherein the angle is no more than 60o.
15. A vulcanised fibre ng tool according to any one of the preceding claims, wherein the grinding tool is constructed to comprise a segment of the two vulcanised fibre grinding discs.
16. A ised fibre ng tool according to Claim 7 or Claim 8, wherein each of the elongated through holes comprises a first end portion and a second end portion, and the first end portion has a larger radial spacing WO 67377 from the axis of rotation of the vulcanised fibre grinding tool than the second end portion. W0 67377
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE201320010146 DE202013010146U1 (en) | 2013-11-11 | 2013-11-11 | Improved vulcanized fiber grinding tool |
DE201310017962 DE102013017962A1 (en) | 2013-11-11 | 2013-11-11 | Improved vulcanized fiber grinding tool |
DE202013010146.6 | 2013-11-11 | ||
DE102013017962.9 | 2013-11-11 | ||
NZ72080814 | 2014-11-11 |
Publications (2)
Publication Number | Publication Date |
---|---|
NZ745632A true NZ745632A (en) | 2021-08-27 |
NZ745632B2 NZ745632B2 (en) | 2021-11-30 |
Family
ID=
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Free format text: PATENT RENEWED FOR 1 YEAR UNTIL 11 NOV 2023 BY ZONE PATENTS LIMITED Effective date: 20221110 |
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