JPH07164271A - Fixing structure for tool holder - Google Patents

Abstract

PURPOSE:To provide a fixing structure for tool holder in which a tool holder having pull studs different in form mounted thereon can be easily mounted onto a setting base, paying the attention to the V-groove, key groove and tapered part of the tool holder whose specification is unified by a maker. CONSTITUTION:A male screw 12 is spirally cut on the outer circumferential surface of the tapered hole 11 periphery of a setting base 10. A nut 14 having two locking projections 16 capable of being inserted to two key grooves 3 of a tool holder 1, and locking the inner circumferential surface of a V-groove 2 on the upper part inner periphery is screwed to the male screw 12 of the setting base 10. Each locking projection 16 of the nut 14 is inserted to each key groove 3, the tapered part 4 of the tool holder 1 is inserted into the tapered hole 11 of the setting base 1, and the nut 14 is then rotated, whereby the locking projection 16 presses the inner circumferential surface of the V-groove 2, and the tool holder 1 can be set on the setting base 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for fixing a blade holder used for a machining center or the like to a setting table used for inspecting the deflection of the blade and setting the blade.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5, a cutting tool holder 1 used for a machining center is provided with a V-groove 2 on the outer circumference of the end portion and a symmetrical position of the V-groove 2 (the cutting tool holder 1 Two key grooves 3 extending toward the end face are provided at a position (shifted by 180 ° on the outer circumference), and a taper portion 4 for fixing is provided on the end face so as to project. The V-groove 2 serves as a portion where the automatic changer grips the blade holder 1 when exchanging the blade holder together with the blade holder 1, and the key groove 3 serves as a rotation stop at that time. Further, as shown in FIG. 6, the taper portion 4 presses a tapered hole 7 formed on an end surface of a spindle 6 for fixing the blade holder 1 into pressure contact, and fixes the blade holder 1 to the spindle 6 without shifting. .

Further, in the conventional blade holder 1, a pull stud 5 is screwed onto the end surface 4a of the tapered portion 4 in order to fix the blade holder 1 to the spindle 6. The pull stud 5 has a drawbar 8 arranged in the spindle 6.
The pull stud 5 is gripped by the collet 9 and towed by the collet 9, and the conventional blade holder 1 is fixed to the spindle 6.

[0004]

However, in the conventional blade holder 1, the dimensions and shapes of the V groove 2, the key groove 3, and the taper portion 4 of the blade holder 1 are standardized and unified by each machine tool manufacturer. However, the shape of the pull stud 5 screwed onto the end surface 4a of the taper portion 4 (especially the shape of the engaging portion 5a at the tip held by the collet 9 (see FIGS. 5 and 6)) differs depending on each machine tool manufacturer. It was Therefore, for example, when fixing to the setting table when inspecting the runout of the tip of the cutting tool, it is necessary to prepare a setting table having the collet 9 and the draw bar 8 according to the shape of the pull stud 5. It would have been very expensive.

The present invention solves the above-mentioned problems, and pays attention to the V groove, the key groove, and the taper portion of the cutting tool holder, the standard of which is standardized by each machine tool manufacturer, and uses pull studs having different shapes. An object of the present invention is to provide a fixing structure of a blade holder that can easily fix the attached blade holder to a setting table.

[0006]

A fixing structure for a cutting tool holder according to the present invention is provided with a V-groove on the outer circumference of an end portion, and two key grooves extending toward the end face at symmetrical positions of the V-groove. A cutting tool holder having a fixing taper portion protruding from the end face thereof is pressed against a tapered hole formed in the setting table to fix the cutting tool holder to the setting table. In the structure, a male screw is threaded on the outer peripheral surface of the peripheral edge of the taper hole of the setting table, and the male screw of the cutting tool is attached to the male screw of the setting table.
A nut having two locking projections, which can be inserted into one key groove and can lock the inner peripheral surface of the V groove, provided on the inner peripheral edge of the upper portion is screwed, and the locking projections of the nut are fitted in the respective key grooves. Respectively, and the tapered portion is inserted into the tapered hole of the setting table, the nut is rotated, and the inner peripheral surface of the V groove is pressed by the locking projections to move the cutting tool holder to the setting table. It is characterized by being fixed to.

[0007]

In the fixing structure according to the present invention, the locking projection of the nut screwed with the male screw of the setting table is inserted into the key groove of the cutting tool holder, and the tapered portion of the cutting tool holder is inserted into the tapered hole of the setting table. Insert it, then turn the nut,
The nut moves so as to approach the setting table, the locking projection of the nut tightens and presses the inner peripheral surface of the V groove in the cutting tool holder, presses the tapered portion of the cutting tool holder into the tapered hole of the setting table, The blade holder can be fixed to the setting table.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 to 4, the setting table 10 used in the embodiment is provided with a tapered hole 11 into which the tapered portion 4 of the cutting tool holder 1 is inserted, and the outer peripheral surface of the peripheral edge of the tapered hole 11 is The male screw 12 is threaded. Taper hole 1
The bottom portion 11a of No. 1 is largely recessed so as not to interfere with the pull stud 5 attached to the cutting tool holder 1. Also,
Positioning protrusions 13, 13 that can be inserted into the two key grooves 3 of the cutting tool holder 1 are provided on the upper end surface of the peripheral edge of the tapered hole 11 in the setting table 10. The height of these positioning protrusions 13 and 13 is determined by the respective keyways 3 of the cutting tool holder 1.
The projections 13 and 13 are inserted into the inside of the setting table 10, and the tapered portion 3 of the blade holder 1 is inserted into the tapered hole 11 of the setting table 10.
When the outer peripheral surface of the taper portion 4 is brought into contact with the inner peripheral surface of the taper hole 11 by inserting the upper end of the protrusions 13 and 13 is set to a height that does not enter the V groove 2 of the cutting tool holder 1. There is.

The nut 14 attached to the setting table 10 is formed with an internal thread 15 on its inner peripheral surface which is screwed with the external thread 12 of the setting table 10, and locking projections 16 and 16 project at symmetrical positions on the upper end surface. It is set up. These locking projections 16 are composed of a pillar portion 17 extending upward and a hook portion 18 extending from the pillar portion 17 toward the center of the nut 14, and the hook portion 18 has a width dimension that corresponds to the key of the cutting tool holder 1. It is dimensioned so that it can be inserted into the groove 3, and the tip shape is such that it can be inserted into the V groove 2 of the cutting tool holder 1. That is, the tip of the hook portion 18 has an arc surface 18a corresponding to the bottom surface 2a of the V groove 2 and the V groove 2
The upper tapered surface 18b corresponding to the inner peripheral upper side surface 2b and the lower tapered surface 18c corresponding to the inner peripheral lower side surface 2c of the V groove 2 are formed.

Next, the cutting tool holder 1 is attached to the setting table 10.
First, the nut 14 will be described.
Is screwed to a predetermined position of the male screw 12 of the setting table 10, and each positioning protrusion 13 and each locking protrusion 16 are aligned with each other. The position where the nut 14 is screwed in advance to the male screw 12 is such that when the nut 14 is turned, the hook portion 18 of each locking protrusion 16 can enter the V groove 2 from each key groove 3.
Moreover, if the nut 14 is rotated at an angle of less than 180 °, preferably about 90 °, the lower taper surface 18c of the hook portion 18 of each locking projection 16 in the V groove 2 of the cutting tool holder 1 is rotated. It is a position where it can be pressed against the inner peripheral lower surface 2c.

Then, as shown in FIG. 2, the cutting tool holder 1 having the pull studs 5 attached thereto is tapered while inserting the hook portions 18 of the locking projections 16 and the positioning projections 13 into the key grooves 3. The portion 4 is inserted into the tapered hole 11 of the setting table 10, and the outer peripheral surface of the tapered portion 4 is brought into contact with the inner peripheral surface of the tapered hole 11 to set it on the setting table 10.

Then, when the nut 14 is rotated in the tightening direction, as shown in FIGS.
The rotation of the blade holder 1 is restricted by the hooks 18 of each locking projection 16 while moving from the key groove 3 to the V groove 2, while the nut 14 moves so as to approach the setting table 10, and each engagement member is moved. Lower taper surface 18 of hook 18 of stop projection 16
Since c clamps and presses the inner peripheral lower surface 2c of the V groove 2, the tapered portion 4 of the cutting tool holder 1 is pressed against the tapered hole 11 of the setting table 10 to fix the cutting tool holder 1 to the setting table 10. Become.

After that, a cutting tool (not shown) may be attached to the cutting tool holder 1, or a shake of the tip of the attached cutting tool may be inspected.

As described above, the fixing structure of the embodiment does not use the pull stud 5 attached to the cutting tool holder 1,
The V-shaped groove 2, the key groove 3, the taper portion 4 and the predetermined nut 14 provided on the cutting tool holder 1 can be used to fix the cutting tool holder 1 to the setting table 10 by turning the nut 14, so that the shapes are different. The blade holder 1 to which the pull stud 5 is attached can be easily fixed to the setting table 10.

As in the embodiment, the nut 1 at the time of fixing is fixed.
If the nut 14 is screwed in advance to the male screw 12 of the setting table 10 so that the rotation angle of 4 is less than 180 °, the rotation angle of the nut 14 for fixing or the like is small. Can be easily performed.

Further, in the embodiment, the setting table 10 is provided with
Positioning protrusion 13 to be inserted into the key groove 3 of the blade holder 1
13 is shown, but when the nut 14 is rotated, if the blade holder 1 is pressed by a hand or the like to prevent the blade holder 1 from rotating, these protrusions 13 are unnecessary.

[0018]

In the fixing structure according to the present invention, the pull stud attached to the cutting tool holder is not used, but the V groove, the key groove, the taper portion and the predetermined nut provided in the cutting tool holder are used, and the nut is used. Since the tool holder can be fixed to the setting table by turning, it is possible to easily fix the tool holder to which the pull studs having different shapes are attached to the setting table.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a cutting tool holder, a nut, and a setting table showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state in which the cutting tool holder of the embodiment is inserted into a setting table.

FIG. 3 is a cross-sectional view showing a state in which the blade holder of the embodiment is fixed to a setting table.

4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a perspective view showing a cutting tool holder to which pull studs are attached.

FIG. 6 is a cross-sectional view showing a conventional state in which a blade holder is fixed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Cutting tool holder, 2 ... V groove, 3 ... Key groove, 4 ... Tapered part, 5 ... Pull stud, 10 ... Setting stand, 11 ... Tapered hole, 12 ... Male screw, 14 ... Nut, 16 ... Locking protrusion.

Claims (1)

[Claims] 1. A V groove extending over the entire circumference of the end portion is provided, two key grooves extending toward the end surface are provided at symmetrical positions of the V groove, and a taper portion for fixing is provided on the end surface in a protruding manner. A fixing structure of a cutting tool holder for fixing the cutting tool holder to the setting table by pressing the cutting tool holder into a tapered hole formed in the setting table, the outer peripheral surface of the periphery of the tapered hole of the setting table. A male screw is engraved on the top of the setting table, and two locking protrusions that can be inserted into the two key grooves of the cutting tool holder and can lock the inner peripheral surface of the V groove are provided on the upper inner peripheral edge of the male screw of the setting table. Nuts are screwed together, the locking protrusions of the nut are respectively inserted into the key grooves, the tapered portions are inserted into the tapered holes of the setting table, and the nuts are rotated to lock the locking protrusions. And the V
A fixing structure for a cutting tool holder, characterized in that the cutting tool holder is fixed to the setting table by pressing the inner peripheral surface of the groove.