Abstrict A diamond blade having rim type cutting tip for use in apparatus
such as cutting saw machine having a structure which rim type cutting
tip is able to produce cutting chips with relative large size during
cutting operation so that those chips are easily discharged outside
with reducing the friction with cutting tip of blade, thereby to
increase cutting ability and to prevent the chips dispersing in
the air and giving rise to the bad effects to user's health and
the contamination of environment. The diamond blade according to
the present invention comprises a wheel body connected with a shaft
of electric motor, and rim type cutting tip for cutting or grinding
crushable materials disposed on the circumference of the wheel body
and composed of at least two diamond layers longitudinally disposed
parallel with the rotation direction of the blade in which diamond
particles are included, and non-diamond portion disposed between
the diamond layers in which diamond particles are not included.
Claims What is claimed is:
1. A diamond blade (31) for grinding or cutting workpieces, comprising:
a wheel body (32); and an annular rim type cutting tip (33) having
a uniform rectangular-shaped cross-section, which is fixed to a
periphery of said wheel body (32), said rim type cutting tip including:
two diamond layers (38 38') including diamond particles (39), which
are longitudinally disposed parallel with rotation direction of
said wheel body (32); and a non-diamond portion (35) disposed between
said two diamond layers (38 38'), in which said non-diamond portion
(35) does not include the diamond particles (39); whereby said two
diamond layers (3838') form microscopic cutting grooves (37 37')
within the workpieces (37) during grinding or cutting operation
and said non-diamond portion (35) crushes portion (40) of the workpieces
(37) between the microscopic cutting grooves (37', 37") into
a relatively larger size as said non-diamond portion (35) applies
a relatively small friction and a rotation impact to the portion
(40).
2. The diamond blade as claimed in claim 1 wherein the diamond
particles (39) in each diamond layer of the rim type cutting tip
are formed in a predetermined pattern of grid.
3. The diamond blades as claimed in claim 1 wherein said diamond
particles in each diamond layer of the rim type cutting tip are
randomly distributed.
4. The diamond blade of claim 1 wherein said non-diamond portion
further having a plurality of depressed portions, the depressed
portions being disposed at predetermined intervals to cross each
other on the inner and outer surfaces of the non-diamond portion;
and a plurality of diamond layers longitudinally disposed parallel
with the rotation direction of the diamond blade respectively on
depressed bottom surfaces of the depressed portions, and on the
inner and outer surfaces of the non-diamond portion divided by the
depressed portions of the non-diamond portion, wherein the depressed
bottom surfaces and the inner and outer surfaces are parallel to
the rotation direction of the diamond blade.
5. The, diamond blade as claimed in claim 4 wherein the bottom
surfaces of the depressed portions of the non-diamond portion are
positioned in a plane between the inner and outer surfaces of the
non-diamond portion.
6. The diamond blade as claimed in claim 4 wherein the depth of
the depressed bottom surfaces of the depressed portions surfaces
of the non-diamond portion is less than a half of the thickness
of the non-diamond portion.
7. The diamond blade as claimed in claim 4 wherein the diamond
particles in each diamond layer of the rim type cutting tip are
distributed in a predetermined pattern or arrangement.
8. The diamond blade as claimed in claim 7 wherein the diamond
particles in each diamond layer of the rim type cutting tip are
distributed in a single layer with grid shaped spots.
9. The diamond blade as claimed in claim 7 wherein the diamond
particles in each diamond layer of the rim type cutting tip are
distributed in a double layer with grid shaped spots.
10. The diamond blade as claimed in claim 4 wherein the diamond
particles in each diamond layer of the rim type cutting tip are
randomly distributed.
Description BACKGROUND OF THE INVENTION
The present invention relates to a diamond blade for an apparatus
such as a cutting saw machine for grinding or cutting workpieces
such as brick, concrete, granite, marble, etc., and more particularly
to a diamond blade having a rim type cutting tip in which at least
two diamond layers are longitudinally disposed along the rotation
direction of the diamond blade to form microscopic linear cutting
grooves to cause portions of the workpieces between the cutting
grooves to be crushed in chips of relatively large size by non-diamond
portion of the rim type cutting tip during the cutting operation,
and thereby to enhance cutting rate of the diamond blade and to
prevent the crushed chips from dispersing easily in the air and
from causing bad affects to user's health and the contamination
of environment.
FIG. 1 is a front view of one conventional diamond blade for a
cutting saw machine for grinding or cutting workpieces in which
diamond particles are randomly distributed on a rim type cutting
tip thereof, the conventional diamond blade 1 comprises a steel
wheel body 2 whose center hole is connected with a shaft of electric
motor, and a rim type cutting tip 3 disposed circumferentially and
fixedly on the steel wheel body 2. Here, the rim type cutting tip
3 is fabricated by mixing abrasive materials such as diamond and
metal powders composing of cobalt, nickel, bronze, copper, etc.,
or particles of resin or ceramic, and then forming a rim of predetermined
shape from the mixed particles.
Especially, the diamond particles 4 are randomly distributed in
the inside and on the surfaces of the rim type cutting tip 3 as
shown in FIG. 3.
In the diamond blade 1 as shown in FIG. 3 both outer surfaces
of the rim type cutting tip 3 contacts with corresponding surface
portion of workpiece 18 and grinds it to form a cutting slot 16
in workpiece 18 during the cutting operation.
Minute chips produced during the cutting operation of the rim type
cutting tip 3 are gathered in the cutting slot 16 and then discharged
from there outside by the rotation of the rim type cutting tip 3.
However, since both surfaces of the rim type cutting tip 3 of the
diamond blade 1 has the same shape and the same material composition
on the whole, both edges 15 of the rim type cutting tip 3 contacting
with the side walls and bottom of the cutting slot 16 are defaced
faster than the center 17 of the rim type cutting tip 3 contacting
only with the bottom of the cutting slot 16.
Accordingly, the contacting area between the upper surface of the
rim type cutting tip 3 and the workpiece 18 is enlarged to increase
resistance of the workpieces 18 and thereby causing poor cutting
and decreasing cutting rate and the life of the diamond blade 1.
Further, since the size of chips produced during the cutting operation
is are relatively very minute, these chips remains in the cutting
slot 16 and prevents the upper surface of the rim type cutting tip
3 from grinding the bottom of the cutting slot 16 and thereby decreasing
cutting rate. Also, if those minute chips discharged from the cutting
slot 16 are dispersed in the air, it causes the bad affects to user's
health and the contamination of environment.
To improve these problems, there has been proposed a diamond blade
11 as shown in FIG. 2.
FIG. 2 is a front view of the other conventional diamond blade
in which diamond particles are randomly distributed in rim type
cutting tip thereof and a plurality of depressed portions are disposed
in both outer surfaces of the rim type cutting tip thereof. Namely,
the conventional diamond blade 11 has a plurality of depressed portions
19 formed with a predetermined interval in both surfaces of a rim
type cutting tip 13. Here, the rim type cutting tip 13 is disposed
circumferentially and fixedly on a steel wheel body 12 and has a
plurality of diamond particles 14 on its surfaces.
However, even though the diamond blade 11 is improved tip to be
defaced during the cutting operation as the minute chips are effectively
discharged from the cutting slot, it has still the disadvantages
to deface both edges of upper surface to induce poor cutting, to
decrease its own cutting rate and life of blade, to produce very
minute chips to decrease its own cutting rate, and to disperse the
produced minute chips in the air, which cause the bad affects to
user's health and the contamination of environment.
SUMMARY OF THE INVENTION
It is a main object of the present invention to provide a diamond
blade for cutting or grinding workpieces such as brick, concrete,
granite, marble, etc., having a rim type cutting tip in which at
least two diamond layers are longitudinally disposed along the rotation
direction of the diamond blade to form microscopic cutting grooves
in the workpieces during the cutting operation, and thereby to cause
portion of workpieces between the microscopic cutting grooves to
be easily crushed by non-diamond portion of the rim type cutting
tip to enhance cutting rate of the diamond blade.
It is another object of the present invention to provide a diamond
blade for an apparatus such as cutting saw machine having a structure
which a rim type cutting tip is able to produce cutting chips of
a relatively large size during the cutting operation so that those
chips are easily discharged from the cutting slots outside with
reducing the friction with the rim type cutting tip of the diamond
blade, thereby to increase cutting rate and to prevent those chips
from dispersing in the air and rise to from causing a bad affects
to user's health and the contamination of environment.
It is the other object of the present invention to provide a diamond
blade for use in an apparatus such as a cutting saw machine having
a rim type cutting tip which diamond particles in diamond layer
thereof are distributed in a given pattern to reduce the amount
of diamond particles used and thereby reducing the manufacturing
cost of the diamond blade.
To accomplish these objects, a diamond blade for grinding or cutting
workpieces according to the present invention comprises a wheel
body connected with a shaft of an electric motor, and a rim type
cutting tip for grinding or cutting workpieces disposed on the circumference
of the wheel body, and composed of at least two diamond layers longitudinally
disposed parallel with the rotation direction of the diamond blade
in which diamond particles are included, and a non-diamond portion
disposed between the diamond layers in which the diamond particles
are not included.
In this embodiment of the present invention, the diamond layers
are disposed each other at predetermined intervals perpendicular
to the rotation direction of the diamond blade.
It is desirable that the diamond layers are disposed only on both
surfaces of the rim type cutting tip.
Alternatively, the diamond particles in each diamond layer of the
rim type cutting tip are distributed in a predetermined pattern
or arrangement such a single or double layer figure with grid shaped
spots.
Also, in the non-diamond portion of the rim type cutting tip, the
diamond particles can be distributed in the density lower than that
of the diamond layers.
In the other embodiment of the present invention, a diamond blade
for for grinding or cutting workpieces comprises a wheel body connected
with a shaft of an electric motor, and a rim type cutting tip for
grinding or cutting workpieces, which is disposed on the circumference
of the wheel body and composed of a non-diamond portion having a
plurality of depressed portions disposed at predetermined intervals
to cross each other in both surfaces of the non-diamond portion,
and a plurality of diamond layers longitudinally disposed parallel
with the rotation direction of the diamond blade respectively on
bottom surfaces of the depressed portions of the non-diamond portion
and both surfaces of the non-diamond portion divided by depressed
portions thereof.
In this embodiment of the present invention, it is desirable that
the bottom surfaces of the depressed portions of the non-diamond
portion are positioned in the plane forming the center between both
surfaces of non-diamond portion to let the diamond layers disposed
thereon to form one cutting line during the cutting operation of
the diamond blade.
Also, a depth of all bottom surfaces of the depressed portions
of both surfaces of the non-diamond portion can be set up to be
less than a half of the thickness of the non-diamond portion to
let the diamond layers disposed thereon to form at least two linear
cutting line during the cutting operation of the diamond blade.
BRIEF DESCRIPTION OF THE DRAWINGS
The above objects and other advantages of the present invention
will become more apparent by describing in detail preferred embodiments
thereof with reference to the attached drawings in which:
FIG. 1 is a front view of one conventional diamond blade for a
cutting saw machine in which diamond particles are randomly distributed
in a rim type cutting tip thereof;
FIG. 2 is a front view of the other conventional diamond blade
in which diamond particles are randomly distributed in a rim type
cutting tip thereof and a plurality of depressed portions are disposed
in both surfaces of the rim type cutting tip thereof;
FIG. 3 is a partial cross-sectional view of the conventional diamond
blade shown in FIG. 1 to illustrate state in which the rim type
cutting tip thereof is operated;
FIG. 4 is a perspective view of a diamond blade for cutting saw
machine according to one preferred embodiment of the present invention,
which two diamond layers are longitudinally disposed respectively
in both surfaces of non-diamond portion of the rim type cutting
tip to form two microscopic linear cutting grooves in the workpieces
during the cutting operation;
FIG. 5 is a partial cross-sectional view of the diamond blade of
the present invention taken along life AA of FIG. 4 to illustrate
state which the rim type diamond cutting tip is operated;
FIG. 6 is a perspective view of a diamond blade for cutting saw
machine according to the other embodiment of the present invention
in which a plurality of diamond layers are longitudinally disposed
respectively on bottom surfaces of depressed portions of non-diamond
portion, and both surfaces of non-diamond portion and the depth
of bottom surfaces of depressed portions of the non-diamond portion
is a half of the entire thickness of the non-diamond portion;
FIG. 7 is a partial cross-sectional view of the diamond blade of
the present invention overlapping cross-sections taken along lines
B--B and C--C of FIG. 6 to illustrate state which the rim type diamond
cutting tip is operated;
FIG. 8 is a perspective view of the diamond blade of the present
invention which the depth of bottom surfaces of depressed portions
of the non-diamond portion is less than a half of the entire thickness
of the non-diamond portion;
FIG. 9 is a partial perspective view of the diamond blade of the
present invention shown in FIG. 8; and
FIG. 10 is a partial cross-sectional view of the diamond blade
of the present invention overlapping cross-sections taken along
lines EE and FF of FIG. 9 to illustrate state which the rim type
cutting tip is operated.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
In several embodiments of this invention described below with reference
to the accompanying drawings, the invention is applied to cutting
saw machine.
FIG. 4 is a perspective view of a diamond blade for cutting saw
machine according to one preferred embodiment of the present invention
which two diamond layers are longitudinally disposed respectively
in both surfaces of non-diamond portion of the rim type cutting
tip to form two microscopic linear cutting grooves in the workpieces
during the cutting operation.
As shown in the FIG. 4 the diamond blade 31 for the cutting saw
machine comprises a wheel body 32 connected with a shaft of an electric
motor, and a rim type cutting tip 33 circumferentially fixed on
the wheel body 32 for cutting or grinding workpiece.
Here, the rim type cutting tip 33 comprises two thin diamond layers
38 and 38' longitudinally disposed respectively on both surfaces
thereof parallel with the rotation direction of the diamond blade
31 and a non-diamond portion 35 disposed between two diamond layers
38 and 38', as shown in FIGS. 4 and 5.
FIG. 5 is a partial cross-sectional view of the diamond blade of
the present invention taken along line AA of FIG. 4 to illustrate
state which the rim type diamond cutting tip 33 is operated.
As shown in the FIG. 5 the thin diamond layers 38 and 38' are
composed of particles 39 made of abrasive materials such as diamond,
metal powders composing of cobalt, nickel, bronze, copper, etc.,
or particles of resin or ceramic.
Especially, particles 39 of diamond in thin diamond layers 38 and
38' are randomly distributed, or in a predetermined pattern or arrangement
such a single or double layer figure with grid shaped spots to reduce
a amount of distributed diamond particles.
The non-diamond portion 35 can be further composed of abrasive
materials such as diamond, and metal powders such as cobalt, nickel,
bronze, copper, etc., or resin or ceramic.
The thin diamond layers 38 and 38' function to prevent edge area
of both surfaces of the rim type cutting tip 33 from defacing, and
to form two microscopic linear cutting grooves 37' and 37"
in the workpiece 37 during the cutting operation, as shown in FIG.
5. Thus, a portion 40 of the workpiece 37 between two cutting grooves
37' and 37" can be easily crushed by small frictional and/or
rotation impact force of the non-diamond portion 35 and thereby
the non-diamond portion 35 of the rim type cutting tip 33 is able
to produce cutting chips with a relatively large size during cutting
operation. Here, those chips are easily discharged from a cutting
slot 36 outside with reducing the friction with the rim type cutting
tip 33 thereby the diamond blade increases cutting rate and prevent
the crushed chips from dispersing in the air.
In this embodiment of the present invention, it is noted that the
rim type cutting tip 33 can be substituted by another rim type cutting
tip composed of three or four thin diamond layers longitudinally
disposed therein parallel with the rotation direction of the diamond
blade respectively to form three or four microscopic linear cutting
grooves in the workpiece during the cutting operation, and non-diamond
portions disposed between the three or four diamond layers, as shown
in FIGS. 7 and 10.
The diamond layers are each other disposed at predetermined intervals
perpendicular to the rotation direction of the diamond blade between
the non-diamond portions of the rim type cutting tip.
In this case, a portion of workpiece between the microscopic linear
cutting grooves can be easily crushed by a friction and rotation
impact force smaller than that of the non-diamond portion 35 of
the rim type cutting tip 33 having the two thin diamond layers 38
and 38' as shown in FIG. 5.
Also, the density of the diamond particles 39 distributed in the
diamond layers 38 and 38' of the rim type cutting tip 33 is relatively
larger than that of the non-diamond portion 35 of the rim type cutting
tip 33.
FIG. 6 is a perspective view of a diamond blade for cutting saw
machine according to the other embodiment of the present invention
in which a plurality of diamond layers are longitudinally disposed
respectively on bottom surfaces of depressed portions of non-diamond
portion and both surfaces of the non-diamond portion and the depth
of bottom surfaces of depressed portions of the non-diamond portion
is a half of the entire thickness of the non-diamond portion; and
FIG. 7 is a partial cross-sectional view of the diamond blade of
the present invention overlapping cross-sections taken along lines
BB and CC of FIG. 6 to illustrate state which the rim type diamond
cutting tip is operated. As shown in FIGS. 6 and 7 the diamond
blade 41 for cutting saw machine comprises a wheel body 42 connected
with a shaft of an electric motor, and a rim type cutting tip 43
disposed fixedly on the circumference of the wheel body 42.
Here, the rim type cutting tip 43 comprises a non-diamond portion
45 having a plurality of depressed portions 44 disposed at predetermined
intervals to cross each other in inner and outer surfaces of the
non-diamond portion 45 a plurality of diamond layers 48 48', and
48" longitudinally disposed parallel with the rotation direction
of the diamond blade 41 respectively on the bottom surfaces of the
depressed portions 44 of the non-diamond portion 45 and both divided
surfaces of the non-diamond portion 45 divided by the depressed
portions 44.
Bottom surfaces of the depressed portions 44 of the non-diamond
portion 45 are positioned on the plane forming the center between
both surfaces of the non-diamond portions 45 to let the diamond
layers 48' disposed thereon to form one microscopic linear cutting
groove 47" in the workpiece 47 during the cutting operation
of the diamond blade 41 as shown in FIG. 7.
Thus, the diamond layers 48 48', and 48" on the bottom surfaces
of the depressed portions 44 of the non-diamond portion 45 and
the inner and outer surfaces of the non-diamond portion 45 form
the three microscopic linear cutting grooves 47', 47", 47'"
in the workpiece 47 to let the protruded portions 50 and 50' of
the workpiece 47 between the microscopic linear cutting grooves
47 47', and 47" to be easily crushed by a small friction and
rotation impact force of the non-diamond portion 45 during the cutting
operation of the diamond blade 41 as shown in FIG. 7.
Also, the density of the diamond particles distributed in the diamond
layers 48 48' and 48" is relatively larger than that of the
non-diamond portion 45 of the rim type cutting tip 33.
Alternatively, in this embodiment of the present invention, the
depth of bottom surfaces of the depressed portions 54 in the non-diamond
portion 55 can be less than a half of the entire thickness of the
non-diamond portion 55 to let the diamond layers 58' and 58"
disposed thereon to form the two microscopic linear cutting grooves
57" and 57'" in the workpiece 57 during the cutting operation
of the diamond blade 51 as shown in FIG. 10.
Thus, in this case, the diamond layers 58 58', 58", and 58'"
on both surfaces of the non-diamond portion 55 and the bottom surfaces
of depressed portions 54 thereof form four microscopic linear cutting
grooves 57', 57", 57" and 57"" in the workpiece
57 to let protruded portions 60 60' and 60" of the workpiece
57 between the cutting grooves 57', 57", 57" and 57""
to be easily crushed by a small friction and rotation impact force
of the non-diamond portions 55 during the cutting operation of the
diamond blade 51 as shown in FIG. 10.
The operation of the diamond blades having the rim type cutting
tip for an apparatus such as a cutting saw machine according to
the embodiments of the present invention will de described, hereinafter.
As shown in FIG. 4 when the wheel body 32 connected to the shaft
of electric motor is rotated by the operation of the electric motor,
the rim type cutting tip 33 begins to cut or grind workpieces 37
such as brick, concrete, granite, marble, etc., and then a cutting
slot 36 is generated in the workpiece 37 along a predetermined line.
At this time, since the thin diamond layers 38 and 38' including
the particles 39 of diamond disposed in both surfaces of the rim
type cutting tip 33 both the edges of the rim type cutting tip
33 are defaced less than the center of the diamond blade and thereby
the two microscopic linear cutting grooves 37' and 37" are
formed in the cutting slot 36 in the workpiece 37 as shown in FIG.
5.
By forming the cutting grooves 37' and 37", the protrude portion
40 of the workpiece 37 therebetween is weakened and easily crushed
by a small friction and rotation impact force of the non-diamond
portion 35. Thus, the non-diamond portion 35 of the rim type cutting
tip 33 is able to produce cutting chips with relatively large size,
and the produced chips are easily discharged from the cutting slots
36 outside with reducing the friction between the rim type cutting
tip 33 and the workpiece, thereby the diamond blade 31 increases
cutting rate and prevents the produced chips from dispersing in
the air.
Therefore, by repeating the operation of the rim type cutting tip
33 of the diamond blade 31 the workpiece 37 along the predetermined
line thereon is cut or ground.
Similarly, as shown in FIGS. 7 and 10 the operation of these diamond
blades 41 and 51 is the same that of the diamond blade 31 of embodiment
noted above expect that the diamond layers 48 48", and 48",
or 58 58', 58", 58'", and 58"" on both surfaces
of the non-diamond portion 45 or 55 and bottom surfaces of depressed
portions 44 or 54 form the three or four linear cutting grooves
47', 47", and 47'", or 57', 57", 57'", and 57""
in the workpieces 47 or 57.
As apparent from the foregoing description, it can be appreciated
that the present invention provides a diamond blade having a rim
type cutting tip which at least two diamond layers are longitudinally
disposed along the rotation direction of the diamond blade to form
at least two microscopic linear cutting grooves in the workpieces
during the cutting operation, and thereby they form the protrude
portions of workpieces between the cutting grooves to be easily
crushed by the non-diamond portions of the rim type cutting tip
and enhance cutting rate of the diamond blade.
Also, the present invention provides a diamond blade having a structure
which the rim type cutting tips are able to produce cutting chips
with relatively large size during the cutting operation, so that
those chips are easily discharged from the cutting slot outside
with reducing the friction between the rim type cutting tip and
the workpiece, thereby they increase cutting rate and prevent the
crushed chips from dispersing in the air and from causing the bad
affects to user's health and the contamination of environment.
Also, the present invention provides a diamond blade having a rim
type cutting tip which diamond particles in diamond layer thereof
are distributed in a predetermined pattern to reduce a amount of
distributed diamond particles and thereby reducing the manufacturing
cost of the diamond blade. |