Cutting by use of rotating axially moving tool – With means to apply transient – fluent medium to work or product – Including tool with duct
Reexamination Certificate
2002-09-25
2004-04-27
Howell, Daniel W. (Department: 3722)
Cutting by use of rotating axially moving tool
With means to apply transient, fluent medium to work or product
Including tool with duct
C279S020000, C408S23900A, C409S234000
Reexamination Certificate
active
06726412
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a tool holder for machine tool and a tool driver used in the tool holder.
BACKGROUND OF THE INVENTION
A tool holder as shown in
FIG. 8
, which is attached or detached on a spindle of a machine tool, has been already existed. The outline configuration of the tool holder is as follows.
That is,
1
is a tool holder main body, and consists of a direct cylindrical shaft part
1
a
, a flange part
1
b
and a taper-shank part
1
c
. A through-hole “a” is formed in a rotating center part “x” of the tool holder
1
, and female screw threads a
1
, a
2
are formed in front and rear parts of the inner peripheral surface of the through-hole “a”. Numeral
2
is a collet that is inserted into a taper hole of the direct cylindrical shaft part
1
a
. Numeral
3
is a collet fixing means that is fixed on a male screw thread “b” formed in the anterior outer peripheral surface of the direct cylindrical shaft part
1
a
, which consists of a nut body
3
a
, a ring rod member
3
b
and a combining member
3
c
. Numeral
4
is a pull-stud that is fixed on the posterior end of the taper-shank part
1
c
through the female screw thread a
2
.
Numeral
5
is an adjusting screw, which has a male screw thread formed in the outer peripheral surface and is installed on the middle of the length of the female screw thread a
1
as the front and rear positions can be adjusted. A through-hole “c” is formed in the center of the adjusting screw
5
, and the posterior part of a through-hole “c” is formed into hexagon hole c
1
. To the inside of a through-hole part a
3
of a front side of the adjusting screw
5
, a tool driver
6
shown in
FIG. 9
is inserted closely and slidably in longitudinal direction.
An outer peripheral surface of the tool driver
6
is formed in smoothing surface, and driver pins
7
,
7
protrude on the peripheral surface part of the tool driver
6
facing to its diameter direction. The driver pins
7
,
7
are guided by guide rails “d”, “d” which are formed in an inner peripheral surface of the through-hole part
3
a
. Partial passage through-holes e
1
, e
2
, e
3
which form a part of a below-mentioned passage through-hole formed in the rotating center part “x” of the holder main body
1
are provided to the center of the tool driver
6
.
Numeral
8
is a cutting liquid communicating tube. A front end thereof is airtightly inserted into the partial passage through-hole e
2
through an O ring, and on the other hand, a back end thereof is airtightly inserted into the anterior part of the central hole e
4
of the pull-stud
4
through an O ring.
Numeral
10
is a cutter having a cutting fluid path e
5
with a small diameter to the center of its main body. The cutter
10
is inserted into the through-hole part a
3
of the holder main body
1
and a fitting female part forming the partial passage through-hole e
3
in the forefront position of the tool driver
6
by way of the central hole “f” of the collet
2
. As shown in
FIG. 10
, a peripheral surface notching part
10
a
called a tongue etc. is formed on a posterior part of the cutter
10
. In this case, the fitting female part e
3
is what a diameter part of a front end of the tool driver
6
is cut in the shape of a groove. A rubber packing
11
is pasted down a bottom surface of the fitting female part e
3
with adhesives.
When equipping the holder main body
1
with the cutter
10
of the tool holder, first the nut body
3
a
of the collet fixing means
3
is loosened to make the collet
2
in the open status. Then, the bottom of the cutter
10
is inserted from the collet
2
front side by way of a central hole “f” of the collet
2
, and the peripheral surface notching part
10
a
is fitted on the fitting female part e
3
. In this case, a back end surface of the peripheral surface notching part
10
a
is pressed to the rubber packing
11
at the bottom of the fitting female part e
3
. This status is held, and the nut
3
a
is clamped tight.
Therefore, the cutter
10
is fastened to the holder main body
1
through the collet
2
, and the cutting fluid path e
5
of the cutter
10
and the partial passage through-holes e
1
, e
2
, e
3
of the tool driver
6
are communicated airtightly.
While using the tool holder, cutting fluid mist or cutting fluid supplied from a spindle side of the machine tool passes through the central hole e
4
of the pull-stud
4
, and thereafter reaches the passage through-hole “e” of the holder main body comprising the cutting fluid communicating tube
8
, the partial passage through-holes e
1
, e
2
, e
3
, and the through-hole part a
3
. Furthermore, it passes through the cutting liquid path e
5
of the cutter
10
, spouts from an opening of the tip thereof, and lubricates a friction part of the cutter
10
to a work.
There are the following troubles in the tool holder of the conventional machine tool.
That is, when equipping the holder main body
1
with the cutter
10
, it is required to push backward the cutter
10
with sufficient force, to press the back end surface of the peripheral surface notching part
10
a
to the rubber packing
11
at the bottom of the fitting female part e
3
, and to clamp the collet fixing means
3
as holding this status. If thus attaching operation is not performed completely, the cutting fluid mist or the cutting fluid leaks from the part of the rubber packing
11
during a machining.
Besides, when the collet fixing means
3
fastens insufficiently the cutter
10
due to a certain cause, relative rotation of the cutter
10
to the holder main body
1
can not be regulated by any effect any longer, and processing by this cutter
10
can not continue.
Besides, when pressing the tool holder to the work strongly, the cutter
10
tends to slide backward to the collet
2
. In this case, since the rubber packing
11
catches the back end of the cutter
10
, the cutter
10
is not surely prevented from moving, and sometimes moves backward to the spindle. Accordingly, it is feared that machining accuracy may be injured.
An object of the present invention is to provide a tool holder for machine tool and a tool driver etc., which can solve the above-mentioned troubles.
SUMMARY OF THE INVENTION
The present invention relates to a tool holder for machine tool as follows. Plural guiding grooves parallel to a spindle direction are provided on the inner peripheral surface of a through-hole at a rotating center part of a tool holder main body. A tool drive that regulates relative rotation with the holder main body and can control front and rear positions by sliding along the spindle direction is assembled by the guiding grooves. A partial passage through-hole forming a part of the through-hole is formed at the rotating center part of the tool driver. A cutter comprises a cylindrical male surface part for sealing formed on the rear-outer peripheral part, a male surface part for regulating rotation comprising plane surface bodies formed at the front of it, and a half-moon shaped plane part formed at each front edge of them. Instead of the male surface part for regulating rotation and the half-moon shaped plane part, a groove for regulating longitudinal move comprising plane surfaces and half-shaped plane parts of the front and rear edges thereof may be formed. Here, the male surface part for regulating rotation is formed by cutting a fixed range of peripheral surface of the cutter, and the groove for regulating longitudinal move is formed by cutting a fixed range of the peripheral surface in concave shape. To the front-inner peripheral surface of the partial passage through-hole of the tool driver, a cylindrical female surface part for sealing to seal up the cylindrical male surface part for sealing of the cutter, and a fitting female part regulating relative rotation by fitting the plane surface bodies of the male surface part for regulating rotation or the concave of the groove for regulating longitudinal move. A barrier surface of the fitting female part contacts on the half-moon shaped plane part, thereby regulating relative rotation
Makiyama Tadashi
Sugata Shinsuke
Anderson Chad C.
Horkos Corp.
Howell Daniel W.
Shannon John P.
LandOfFree
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