JPH0549229U - Tool holder - Google Patents

Abstract

(57) [Summary] [Purpose] When exchanging the tool holder, the bite between the taper shank of the tool holder and the taper surface of the spindle hole of the machine tool can be easily released by compressed air.
Makes it easy to pull out the tool holder. [Structure] A plurality of recessed grooves 16 are provided in the longitudinal direction from the end surface 15 to the circumferential groove 14 on the outer peripheral surface of the tapered shank portion 13 of the holder body 11 so that compressed air supplied from the inside of a spindle hole 21 of a machine tool is recessed. The groove 16 is filled to release the bite between the outer peripheral surface of the tapered shank portion 13 and the tapered surface of the spindle hole 21.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a tool holder with a taper shank that is attached to and detached from a spindle of a machine tool such as a machining center.

[0002]

[Prior Art]

 Generally, the spindle hole of a machine tool has a 7/24 taper to facilitate the mounting of the tool holder, and correspondingly, the outer peripheral surface of the shank part of the tool holder also has a 7/24 taper. Is becoming In this way, when the tapered shank of the tool holder is fitted into the spindle hole having a 7/24 taper and heavy cutting is performed, an excessive force is applied between the outer peripheral surface of the shank portion of the tool holder and the tapered surface of the spindle hole. Occurs, and as a result, biting occurs, making it difficult to extract the tool holder.

That is, when the taper shank portion 2 of the holder body 1 of the tool holder as shown in FIG. 8 is pulled out in the arrow direction from the spindle hole 4 of the spindle 3 of the machine tool, the machine tool spindle hole 4 and the tapered shank portion Since the taper contact area with 2 is large, biting may occur.

When the tool holder is pulled up by the drawing screw on the spindle side of the machine tool, if the tapered surface is hit, the hitching is released by loosening the drawing screw and giving a shock from above with a hammer or the like. ing. Even if the spindle 3 side pulls up the tool holder by the pull stud 5 and the holder withdrawal mechanism is built in the spindle hole 4, if the taper surface bites, move it to the side surface of the tool holder with a hammer etc. It gives a shock and releases the bite.

[0005]

[Problems to be solved by the device]

 However, in order to release the bite between the spindle hole 4 and the taper shank portion 2 of the tool holder, applying a shock to the machine tool or tool holder with a hammer or the like leads to deterioration of the machine tool and tool holder, and It also has the problem of causing defects. In particular, in an automatic machine tool such as a machining center, automatic tool change operation may be hindered, and automatic operation may become impossible.

An object of the present invention is to solve the above-mentioned problems and to allow the tool holder to be easily pulled out from the machine tool spindle when the tool is replaced even if there is a bite between the spindle hole and the taper shank portion of the tool holder. The purpose is to provide a tool holder.

[0007]

[Means for Solving the Problems]

 A tool holder according to the present invention for achieving the above-mentioned object is provided with a plurality of concave grooves on the outer peripheral surface of the tapered shank portion of the holder body in the longitudinal direction from the end surface to the middle of the tapered shank portion. The feature is that compressed air is supplied from inside the hole of the machine tool spindle.

[0008]

[Action]

 In the tool holder with the above configuration, the compressed air supplied from the inside of the spindle hole of the machine tool when the tool is replaced fills the concave groove provided in the taper shank portion, and the outer peripheral surface of the taper shank portion and the taper of the spindle hole taper. Since the bite with the surface is released, the tool holder can be easily pulled out from the spindle hole.

[0009]

【Example】

 The present invention will be described in detail with reference to the embodiments shown in FIGS. FIG. 1 is a side view of a shank portion of a tool holder according to the present invention, and FIG. 2 is a front view thereof. In the drawings, 11 is a holder main body, 12 is a flange portion thereof, and 13 is a taper shank portion to be inserted into a spindle hole of a working machine.

The outer peripheral surface of the taper shank portion 13 has a 7/24 taper in order to facilitate the attachment / detachment to / from the spindle hole, and a circumferential groove is provided at a position in the middle of the taper shank portion 12 side. 14 are provided, and a plurality of concave grooves 16 are provided from the end surface 15 to the circumferential groove 14 along the longitudinal direction of the tapered surface. These recessed grooves 16 are filled with compressed air supplied from the inside of the spindle hole, and when the holder body 11 is mounted on the spindle, the recessed grooves 16 are exposed from the end face of the spindle. It is provided within the range that does not exist.

FIG. 3 shows a distribution state of the pressure P ′ applied in the direction of extracting the holder body 11. When replacing the holder body 11 inserted in the spindle 20, the tool holder is pulled out from the spindle hole 21 by the pressure of the compressed air supplied from the inner part of the spindle hole 21.

FIG. 4 is an enlarged view of the portion A of FIG. 3, and the pressure P ′ applied in the direction of extracting the holder body 11 acts on the inside of the groove 16 to increase the extracting force P. The holder body 11 can be easily pulled out even with a relatively small air pressure.

In the above embodiment, the circumferential groove 14 is provided in the middle of the taper shank portion 13, compressed air is introduced from the concave groove 16 into the circumferential groove 14, and the taper shank portion 13 is evenly distributed over the entire circumference thereof. As shown in FIG. 5, when the pressure P ′ is applied to the bottom surface of the circumferential groove 14, the bottom surface 14a of the circumferential groove 14 is made parallel to the axis and the step portion 14b is enlarged to increase the pressure receiving area. The power can be increased further. However, the circumferential groove 14 may be omitted and the recessed groove 16 may be a dead end in the middle of the tapered shank portion 13. The number of the concave grooves 16 does not necessarily have to be 12 as shown in the figure, and the phases thereof are not always the same.

It is preferable that the position of the groove 16 is appropriately changed by the tool holder so that the spindle of the machine tool is uniformly subjected to the surface pressure. Further, the cross-sectional shape of the concave groove 16 can be various shapes such as a semicircle, a square or a V-shape as illustrated in FIGS. 6 (a), 6 (b) and 6 (c). Further, as shown in FIG. 7, the groove 17 may be provided on the spindle hole 21 side of the machine tool.

[0015]

[Effect of the device]

 As described above, in the tool holder according to the present invention, the bite of the tapered surface is removed by the compressed air supplied from the inside of the spindle hole of the machine tool when the tool is replaced, so it can be easily removed from the spindle of the machine tool. Is possible. Therefore, it is not necessary to hit the machine tool or tool holder with a hammer to remove the bite on the tapered surface, and it is possible to prevent deterioration of the machine tool and tool holder and deterioration of accuracy. it can.

[Brief description of drawings]

FIG. 1 is a side view of a tapered shank portion of a tool holder.

FIG. 2 is a front view.

FIG. 3 is an explanatory diagram of a pressure distribution state.

FIG. 4 is an enlarged explanatory diagram of a portion A in FIG.

FIG. 5 is a cross-sectional view of another embodiment.

FIG. 6 is a cross-sectional view of a shape example of a groove.

FIG. 7 is a cross-sectional view in which a groove is provided in a spindle hole.

FIG. 8 is a sectional view of a conventional example.

[Explanation of symbols]

 11 Holder Main Body 12 Flange 13 Tapered Shank 14 Circumferential Groove 15 End Face 16, 17 Recessed Groove 20 Spindle 21 Spindle Hole

Claims (1)

[Scope of utility model registration request] 1. A plurality of recessed grooves are provided on the outer peripheral surface of the taper shank portion of the holder main body in the longitudinal direction from the end surface to the middle of the taper shank portion, and compressed air is supplied to these recessed grooves from the inside of the machine tool spindle. A tool holder that is characterized by: