JP2001269805A - Toolholder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a toolholder that can hold a shank portion 4b of a tool 4 with sufficient gripping force and thus ensure appreciable cutting. SOLUTION: A some 1/100 taper hole portion 1b is formed so as to open on the tip of a holder body 1 and taper over the internal surface of the tip portion of the body 1 toward the back end, and a similar taper to that of the holder body 1 is formed over the external surface of a body 3a of a taper collet 3. The tip portion of the body 3a has a flange portion 3b projecting from the external surface. The shank portion 4b of the tool 4 fitted in the body 3a is pressed in the hole portion 1b of the holder body 1 and then gripped via the body 3a of the collet 3. A detent pin 2 is screw-fitted in a tapped hole 1c that radially perforates through to the center of the holder body 1, until the inner end of the pin 2 is engaged in a notch portion 3c at the back end of the collet 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool holder in which a shank portion of a tool such as a drill or a reamer is grasped through a tapered hole of a holder body through a tapered collet.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 1, a nut 12 is loosely screwed into a male screw portion 11a formed on the outer periphery of the tip of a holder body 11, and formed on the tip of the holder body 11. A taper cot 13 is fitted into a tapered hole 11b having a large diameter on the distal end side.
There has been a tool holder that fits a shank portion 14b connected to a blade portion 14a of a tool 14 such as a reamer and tightens the male screw portion 11a with the nut 12 so as to tighten and hold the shank portion 14b of the tool 14 via the collet 13.

However, in the above-mentioned tool holder, the tip of the nut 12 is protruded from the male screw portion 11a of the holder body to the tip side, and a projection 12 is formed on the inner peripheral surface of the protruding portion.
a, and the projection 12a is engaged with the groove 13a provided on the outer periphery of the distal end of the tapered collet 13. Therefore, the portion of the nut 12 protruding toward the distal end of the holder body 11 is a wasteful part that does not grasp the collet 13. Further, since the nut 12 is screw-fitted to the tip of the holder body 11, there is a problem that the outer diameter becomes large.

Conventionally, as shown in FIG. 2, a tapered hole 2 having a large diameter at the distal end is formed in the inner peripheral surface of the distal end of the holder body 21.
1a, a taper collet 23 is fitted from the tip side, and a shank portion 24a connected to the blade portion 24a of the tool 24 is fitted into the taper collet 23, and the distal end 2 of the taper collet 23 is fitted.
A female screw hole 23b is formed in 3a, the pulling rod 22 is screw-fitted, and the taper collet 23 is pulled into the distal end side of the holder main body 21, whereby the shank portion 24b of the tool 24 is tightened and held via the taper collet 23. There was also a tool holder. In the tool holder shown in FIG. 2, the processing of the taper collet 23 becomes complicated, and the cost increases. In addition, since the nut as shown in FIG. Although the outer diameter can be made small, there is a limit in reducing the diameter of the holder body 21 because the taper angle of the taper collet 23 is so tight that the outer diameter cannot be made sufficiently small.

[0005]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems and makes it possible to make the distal end portion of the holder main body sufficiently small in outer diameter, and to ensure the shank portion of the tool with a sufficient grasping force. Can be held, the structure is simple and easy to manufacture,
It is another object of the present invention to provide a tool holder used for a drill, a reamer, and the like, which is easy to manage, can work with peace of mind, does not wobble, and can perform good machining.

[0006]

In order to achieve the above object, according to the first aspect of the present invention, an outer periphery of a front end portion of a holder body is formed into a circular shape tapered to a front end, and an opening is formed at the front end of the holder main body. A taper equal to the taper of the holder main body is formed on the outer peripheral surface of the main body of a 1/100 taper or a gentle taper collet close to the taper on the inner peripheral surface at the distal end portion on the distal end portion of the main body, and the main body of the taper collet is formed. A flange portion is protruded from the outer periphery of the tip of the tool, and a shank portion of a tool such as a drill or a reamer is fitted into a main body of the taper collet and pressed into a tapered hole portion of the holder main body. Grasping through the main body of the taper collet, a detent pin is screwed into a screw hole penetrating in the radial direction toward the center of the holder body, and the inner end of the pin is It is characterized in that is engaged with the notch portion formed at the distal end of the Pakoretto body.

[0007] The invention described in claim 2 is characterized in that a through hole is formed in the center of the main body from the end of the holder main body to the hole of the main body, and the main body is made substantially cylindrical.

The invention according to a third aspect is characterized in that the tapered collet is formed at one location in the axial direction and has a slit which is divided in all portions having no remaining portion.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 3, the outer circumference of the distal end side of the steel holder body 1 having an outer diameter of 20 mmΦ and a total length of 200 mm is rounded to a length of about 1/3 of the full length of the main body 1 at an inclination of 2 ° to the tip. The tapered portion 1a is formed and opened to the main body 1, and the inner peripheral surface on the distal end side of the main body 1 has a length of about 1/2 that of the tapered portion 1a and is 1/10.
A hole 1b having a zero taper is formed up to the tip, and
0 mmΦ, 1/100 tapered hole 1b of the main body 1
Is formed by penetrating through the entirety of the body 1 in the radial direction of the main body 1, and a detent pin 2 is screwed into the screw hole 1 c.

The inner diameter of the main body 1 is 9 mm at the intermediate portion 1d.
Φ, the end 1e is slightly larger in diameter than the middle 1d,
A through hole extending from the end of the main body 1 to the hole 1b is formed in the center of the main body 1 so that the main body 1 is substantially tubular. Note that a cutout may be provided in the outer peripheral portion at the terminal end of the main body 1.

The outer peripheral surface of the main body 3a of the tapered collet 3 has a 1/100 taper equal to the taper of the holder main body 1 so that the main body 3a of the tapered collet 3 fits into the hole 1b of the holder main body 1 in close contact. Flange 3 around the tip
b protrudes at right angles to the main body 3a.

The tapered collet 3 is formed with a notch 3c opening at the end in a horizontal U-shape, and the notch 3c is provided with a detent pin 2 screwed into the screw hole 1c. However, the inner end of the anti-rotation pin 2 does not protrude into the holder body 1, and the anti-rotation pin 2 is provided with a groove in the outer end surface so that it can be rotated by a driver or the like.

Incidentally, in the other constructions of the taper collet 3, a plurality of cut grooves (slits) are formed in the axial direction over the entire length except for the end portion (remaining portion) as in the conventional one. The tool 4 has a blade 4a such as a drill or a reamer, and the straight shank 4b can be press-fitted into the collet 3 by a press-fitting jig or the like.

In order to use the tool holder having the above-mentioned structure, as shown in FIG. 4, the shank portion 4b of the tool 4 is pushed into the tapered collet 3 from the front end opening thereof to be fitted and held. The shank portion 4b is forcibly pressed into the 1/100 tapered hole portion 1b of the holder body 1.

At this time, the notch 3c provided at the end of the taper collet 3 is made to face the screw hole 1c provided in the holder main body 1, and the outside of the holder main body 1 is rotated using a suitable tool such as a screwdriver. The stop pin 2 is rotated, and the inner end of the pin 2 is engaged with the notch 3c.
The tool holder is driven to rotate by an appropriate means, and processing such as drilling is performed by a blade 4a such as a drill.

As described above, in the tool holder of the above-described embodiment, the outer peripheral portion on the distal end side of the holder main body 1 is formed to be tapered at 2 ° or the like. As compared with the one having a large-diameter nut protruding from the tip of the holder body, the tip of the holder body 1 can have a sufficiently small outer diameter, and the inner peripheral surface of the hole of the workpiece can be easily cut.

The axial length of the flange portion 3b of the tapered collet 3 projecting from the tip of the holder body 1 is short,
Inner peripheral surface of tip end of holder body 1 and taper collet 3a
Since the outer peripheral surface of the tool 4 has a taper of 1/100 and a gentle slope, the shank portion 4b of the tool 4 fitted to the tapered collet 3 can be reliably held with a sufficient grasping force.

Further, a tightening nut as shown in FIG.
It is not a complicated structure such as a taper collet as shown in Fig. 2, but has a small number of parts and a simple structure. It is easy to manufacture and manage, can work with peace of mind, and has almost no whirling. Good machining can be performed by using the tool 4.

Further, the configuration of the taper collet 3 is as follows.
A notch 3c formed in a horizontal U-shape for disposing a detent pin 2 opened at the end is provided, and a plurality of cut grooves (slits) are formed in the axial direction over the entire length except the end (remaining part). However, the present invention is not limited to this, and a tapered collet 30 as shown in FIG. 5 may be used.

That is, the taper collet 30 shown in FIG. 5 has a flange portion 30b protruding from the front end of the holder main body similarly to the above-described embodiment, and a 1/100 taper formed on the inner peripheral surface of the front end portion of the holder main body. The outer peripheral surface 30a is formed with a tapered inclined surface that fits into a taper having a gentle inclination, but a slit 30c is formed over the entire length without providing a residual portion at one location in the axial direction.
A cutout portion 30d formed in a horizontal U-shape in which the detent pin 2 is disposed at the end of c is formed.

When the taper collet 30 having the above configuration is used, the taper collet 30 and the shank portion 4 of the tool 4 are used.
Since it is extremely easy to fit and attach to the holder b, setting to the holder main body can be performed quickly. Further, the taper collet 30 can be easily manufactured, and the force for grasping the tightening of the tool shank increases.

In the present invention, a plurality of screw holes, cut-out portions of a taper collet, and detent pins are provided in the holder main body at a constant interval in the circumferential direction. The length and diameter of the taper to be formed can be changed appropriately, and the inner peripheral surface of the tip end portion of the holder body and the outer peripheral surface of the main body of the taper collet are not limited to 1/100 taper. Often, these angles may be slightly different without being limited to the embodiment.

Further, a hole 1b extends from the end of the holder body 1.
The main body 1 can be made lighter because cooling water or air is supplied to the through-hole and the tool 4 having the through-hole is used. Also, the processing section can be cooled with cooling water or air.

[0024]

As described above, according to the first aspect of the present invention, the outer periphery of the tip end portion of the holder body is formed into a tapered circular shape.
The distal end of the main body can have a sufficiently small outer diameter, and the inner peripheral surface of the hole of the workpiece can be easily processed by a tool such as a reamer. Also, the axial length of the flange portion of the taper collet projecting from the tip of the holder body is short, and the outer peripheral surface of the holder body forms a 1/100 taper or a gentle taper hole close thereto, and the main body of the collet is Since a taper equal to the taper of the holder body is formed on the outer peripheral surface, the shank portion of the tool fitted to the collet can be reliably held with a sufficient grasping force.

Furthermore, as compared with the conventional one, the structure is not complicated, the number of parts is small, the structure is simple, and the production and management are easy. Then, a detent pin was screw-fitted into a screw hole provided in the holder body, and the pin was engaged with a notch formed at the end of the tapered collet main body, so that the rotational force of the holder body was sufficiently applied to the collet. And the cutting by the tool can be surely performed.

According to the second aspect of the present invention, the through-hole extending from the end of the holder main body to the hole is formed at the center of the main body, and the main body is made substantially circular, so that the holder main body can be lightened. In addition, by supplying cooling water or air to the through hole and forming the through hole in the tool, the blade portion or the processing portion of the tool can be cooled by the cooling water or air.

According to a third aspect of the present invention, the tapered collet has a configuration in which a slit is formed at one location in the axial direction and has no remaining portion, so that the tapered collet is fitted to the shank portion of the tool. Since the mounting is extremely easy, the setting to the holder main body can be performed quickly, the taper collet can be easily manufactured, and the tightening force of the tool shank portion is increased.

[Brief description of the drawings]

FIG. 1 is an explanatory longitudinal sectional view of a tip portion showing an example of a conventional tool holder.

FIG. 2 is an explanatory longitudinal sectional view of a tip portion showing another example of a conventional tool holder.

FIG. 3 is an explanatory side view of a tool holder in which most of the embodiment of the present invention has been longitudinally cut.

FIG. 4 is a side sectional view of a used state showing a tip portion of the tool holder shown in FIG. 3;

FIG. 5 is a perspective view showing a modified example of the tapered collet used for the tool holder of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Holder main body 1a Tapered part 1b 1/100 taper hole 2 Detent pin 3 Taper collet 3a Main body 3b Flange part 3c Notch part 4 Tool 4a Blade part 4b Shank part

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yusaku Yamamoto 1-6-153 Motomachi, Higashiosaka-shi, Osaka F-term in Niken Kousaku Co., Ltd. (reference) 3C032 BB12 JJ07

Claims (3)

[Claims] 1. An outer periphery of a distal end portion of a holder main body is formed into a circular shape tapering to a front end, and is opened at a front end of the holder main body. A taper equal to the taper of the holder body is formed on the outer peripheral surface of the main body of the tapered collet,
A flange portion is protruded from the outer periphery of the tip of the main body of the collet, and a shank portion of a tool such as a drill or a reamer is fitted into the main body of the collet and pressed into a tapered hole of the holder body to form a shank of the tool. Part is grasped through the main body of the collet, a detent pin is screwed into a screw hole penetrating in the radial direction toward the center of the holder body, and the inner end of the pin is connected to the end of the collet body. A tool holder, wherein the tool holder is engaged with a notch formed in the tool holder. 2. The tool holder according to claim 1, wherein a through-hole is formed in the center of the main body from the end of the holder main body to the hole of the main body, and the main body is formed in a substantially tubular shape. . 3. The taper collet is located at one position in the axial direction,
The tool holder according to claim 1, wherein a split slit is formed in all portions having no remaining portion.