Abrading – Rigid tool
Reexamination Certificate
2000-11-08
2003-07-22
Rachuba, M. (Department: 3723)
Abrading
Rigid tool
C451S547000, C125S015000, C408S145000, C175S405100, C175S434000
Reexamination Certificate
active
06595844
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an outer-diameter blade, an inner-diameter blade and cutting machines which respectively use the outer-diameter blade and the inner-diameter blade for cutting hard material, such as metal, ceramics, semiconductor single crystal, grass, quartz crystal, stone, asphalt or concrete, and a core drill and a core-drill processing machine which drives the core drill for forming a hole in the hard material.
2. Description of the Related Art
A conventional outer-diameter blade and a cutting machine using the conventional outer-diameter blade will be described with reference to
FIGS. 18
to
21
.
A conventional outer-diameter blade
10
, as shown in
FIG. 18
, is constructed of: a metal base plate
12
having a disk-like shape, which is rotating at a high speed; and a tip portion
14
formed along the outer peripheral part thereof, in which portion diamond abrasive grains or CBN abrasive grains are fixed to the outer peripheral part by metal bonding, resin bonding or electroplating. A numerical mark
16
indicates a shaft hole which is formed in the central part of the metal base plate
12
. A numerical mark
18
indicates a cutting machine and is provided with a rotation drive section
20
which includes drive means such as a motor and a rotary shaft
22
connected to the rotation drive section
20
(FIGS.
19
(
a
) and
19
(
b
)).
When a to-be-cut object or a workpiece G in a shape, such as a plate, a rod or a tube made of hard material, such as glass, ceramics, semiconductor single crystal, quartz crystal, stone, asphalt or concrete, is cut using a conventional outer-diameter blade, there has arisen a problem, because the cutting progresses in the following way: A shape of the tip portion
14
of the outer-diameter blade
10
is channel-like or of a Greek letter Π in section one end of which has an opening facing the metal base plate
12
and the other end of which is flat (FIG.
18
(
c
)) and therefore, as cutting of the to-be-cut object G by the outer-diameter blade
10
progresses, cutting resistance arises between the to-be-cut object G and the outer-diameter blade
10
(FIG.
20
(
a
)).
Since the cutting resistance simultaneously acts in two ways: in one way the workpiece G is warped, and in the other way the metal base plate
12
of the outer-diameter blade
10
is bowed, the to-be-cut object G is put into contact with a side surface
12
a
of the metal base plate
12
and as a result, chipping (a phenomenon that cracking or flaking occur on a cutting, surface of the to-be-cut object G) occurs (FIG.
20
(
b
)).
Besides, a cutting surface M is curved due to bowing (FIG.
21
(
b
)) of the metal base plate
12
of the outer-diameter blade
10
taking place during cutting operation and eventually when the cutting is completed, the tip portion of the outer-diameter blade turns aside (FIG.
21
(
c
)) and a burr N remains at a cut-off end of the to-be-cut object G (FIG.
21
(
d
)).
Then, a conventional inner-diameter blade and a cutting machine using the inner-cutting blade will be described with reference to
FIGS. 26
to
28
. A conventional inner-diameter blade
110
, as shown in
FIGS. 26
to
28
, is constructed of: a base plate
114
(for example a thin metal base plate having a doughnut like shape) with a central hole
112
formed in a central part which rotates at a high speed; and a tip portion
116
formed along an inner peripheral part thereof, abrasive grains (cutting grains) of which portion are fixed to the inner peripheral part by metal bonding, resin bonding or electroplating.
In
FIG. 27
, a numerical mark
120
indicates a conventional cutting machine and the machine
120
is equipped with a rotary shaft
126
which is mounted to the base table
122
in a rotatable manner with a bearing member
124
interposed therebetween. A rotary cylinder
130
is mounted on the top of the rotary shaft
126
. The rotary cylinder
130
is constructed of a circular bottom plate
130
a
and a cylindrical side plate
130
b
vertically set on the bottom plate
130
a.
A grinding liquid waste route
128
is formed lengthwise as a hole through the central part of the rotary shaft
126
and further through the central part of the bottom plate
130
a
of the rotary cylinder
130
and the grinding liquid which is made to flow and falls down on the bottom plate
130
a
during the cutting is discharged through the waste route. An inner-diameter blade
110
of a structure shown in
FIGS. 26
(
a
) and
26
(
b
) is mounted on the upper end of the outer peripheral portion of the cylindrical side plate
130
b
with a mounting plate
132
interposed therebetween.
A numerical mark
134
indicates a motor and a motor pulley
138
is attached to a motor shaft
136
. A pulley
140
is mounted in a lengthwise middle part of the rotary shaft
126
in a corresponding manner to the motor pulley
138
. A numeral mark
142
indicates a drive belt and the belt is extended between the motor pulley
138
and the pulley
140
. When the motor is driven, the motor shaft
136
is rotated, the rotation is transmitted to the rotary shaft
126
through the motor pulley
138
, the drive belt
142
and the pulley
140
, and the rotary shaft
126
is eventually rotated.
The rotary cylinder
130
, the mounting plate
132
and the inner-diameter blade
110
are rotated in company with rotation of the rotary shaft
126
. By putting the to-be-cut object G into contact with the tip portion in rotation, the workpiece G is cut by the tip portion
116
. Numerical marks
144
and
146
indicate bearings attached to outer side wall part of the rotary shaft
126
.
When a to-be-cut object G in a shape, such as a plate, a rod or a tube made of hard material, such as glass, ceramics, semiconductor single crystal, quartz crystal, stone, asphalt or concrete, is cut using a conventional inner-diameter blade while the to-be-cut object G is held by a work holder H, there has arisen a problem, because the cutting progresses in the following way: A cutting resistance arises between the workpiece G and the inner-diameter blade
110
as the cutting progresses. Since the cutting resistance acts so as to bow the inner-diameter blade
110
, the to-be-cut object G is put into contact with a side surface of the inner-diameter blade
110
, which further causes a mechanical contact resistance.
The cutting resistance and the contact resistance cooperate with each other to an adverse effect, so that the inner-diameter blade
110
is bowed more as shown in
FIG. 28
(
c
) and as a result, a cutting surface of the to-be-cut object G is curved as observed after the cutting is finished. The inner-diameter blade
110
which has once been bowed in such a way does not restore its original shape and a to-be-cut object G which comes next is always finished in the cutting so as to have a curved cutting surface of the to-be-cut object G due to the existing deformation of the blade.
In a conventional core drill
212
, as shown in
FIG. 29
, which is a tool, a base metal section
216
having a cup-like shape constructed of a disk-like top wall
216
a
and a cylindrical side wall
216
b
is provided on a fore-end of a shank
214
made of steel, which acts as a rotary shaft; a grinding stone portion
218
is mounted on an outer end part of the base metal section
216
, whose abrasive grains are fixed to the outer end part of the base metal section
216
by metal bonding, resin bonding or electroplating; and not only are the shank
214
, the base metal section
216
and the grinding stone portion
218
rotated by drive means such as a motor, but the grinding stone portion
218
is put into contact with a workpiece W so that the workpiece W can be ground through to form a circle hole in section leaving a cylindrical core therein.
A through-hole
222
along an axis of the shank
214
of the core drill
212
is formed therein in order to supply a grinding liquid
220
to a working area in grinding. For example, when a workpiece W of glass or the like is ground, the grinding liquid
Hattori Ikuo
Ise Yoshiaki
Matsuya Toshikatsu
Mizuno Toru
Sugama Akihiko
Arent Fox Kintner & Plotkin & Kahn, PLLC
Atock Co., Ltd.
Rachuba M.
LandOfFree
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