JP4108828B2 - Cutting oil supply type tool holder - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tool holder, and more particularly to a tool holder for mounting a cutting tool such as a drill or an end mill on a spindle of a machine tool and capable of supplying cutting oil to the cutting tool.
[0002]
BACKGROUND AND PROBLEMS OF THE INVENTION
Generally, in a cutting oil supply type tool holder, a drill having an oil hole for supplying cutting oil to a cutting blade at the center thereof is used. On the other hand, the heavy cutting end mill cannot use an oil hole such as a drill to supply cutting oil to the cutting blade, and is supplied from a nozzle separate from the tool holder. The drill and end mill have shanks of the same diameter. In this respect, the same tool holder can be used, but due to the difference in the cutting oil supply method, the drill and end mill must be used separately, which is inconvenient. there were. In addition, it is necessary to install an independent cutting oil supply device for the end mill, which is uneconomical.
[0003]
Therefore, an object of the present invention is to provide a cutting oil supply type tool holder that can supply cutting oil to a cutting blade for both a drill and an end mill, and can be used for both.
Furthermore, an object of the present invention is to provide a cutting oil supply type tool holder capable of increasing and supplying cutting oil to an end mill in addition to the above object.
[0004]
Configuration, operation and effect of the invention
In order to achieve the above object, a tool holder according to the present invention forms a cutting oil relay groove that forms a ring-shaped recess on the inner peripheral surface of the tip of a cylindrical blade holder provided at the front of the tool holder. The cutting oil passage was formed on the inner peripheral surface of the blade holding portion and inside the relay groove, and the cylindrical portion having the same diameter as the inner peripheral surface of the blade holding portion was formed outside the relay groove.
[0005]
The end mill is attached to the tool holder having the above configuration so that the joint between the cutting edge and the shank coincides with the relay groove. The cutting oil supplied to the holder body is ejected from the cutting oil passage along the cutting edge from the joint portion through the relay groove. On the other hand, a drill having an oil hole at its center is used, and the joint between the cutting edge and the shank is attached to the cylindrical portion outside the relay groove. In this case, the cutting oil reaches from the cutting oil passage to the relay groove, but is sealed by the fitting of the drill shank and the cylindrical portion and is not ejected to the outside. The cutting oil is ejected through the oil hole of the drill.
[0006]
According to the present invention, it is possible to use a drill and an end mill properly with one tool holder and supply cutting oil in any case. In other words, the cutting oil that has been conventionally supplied only from an external nozzle can be supplied to the end mill through the tool holder.
[0007]
Furthermore, in the present invention, it is preferable that the cutting oil passage is a plurality of spiral grooves. The cutting oil passing through the spiral groove is increased in pressure, and scattering in the rotating direction is reduced. That is, cutting oil can be used efficiently.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a tool holder according to the present invention will be described with reference to the accompanying drawings.
[0009]
(Refer 1st Embodiment and FIGS. 1-3)
In FIG. 1, the tool holder which is 1st Embodiment of this invention is equipped with the taper shank part 2 inserted in the main axis | shaft (not shown) of a machine tool in the rear part of the holder main body 1, and the manipulator holding | maintenance part 3 in the intermediate part. And the blade holder 4 is provided at the front. A pull stud 20 is screwed to the rear portion of the taper shank portion 2.
[0010]
The blade holder 4 has a cylindrical shape to which an end mill 50 (see FIG. 2) or a drill 60 (see FIG. 3) can be selectively attached, and the shank 51 of the end mill 50 or the shank 61 of the drill 60 is provided on the inner peripheral surface 5. These cutting blades are integrally held by inserting and tightening the screws 25 and 25.
[0011]
A cutting oil supply hole 10 is formed at the center of the holder body 1, and the supply hole 10 communicates the blade holder 4 and the center hole 21 of the pull stud 20. A cutting oil relay groove 6 is formed at the distal end portion of the inner peripheral surface 5 of the blade holding portion 4 so as to form a ring-shaped recess. Further, three cutting oil passages 7 are formed in a spiral shape on the inner peripheral surface 5 and inside the relay groove 6, and the outside of the relay groove 6 is a cylindrical portion 8 having the same diameter as the inner peripheral surface 5. ing. One end of each of the three spiral passages 7 communicates with the cutting oil supply hole 10 and the other end communicates with the relay groove 6.
[0012]
First, the case where the heavy cutting end mill 50 is used in the tool holder having the above configuration will be described. As shown in FIG. 2, the end mill 50 is attached to the blade holder 4 so that the joint portion 53 of the cutting blade 52 and the shank 51 coincides with the relay groove 6. Cutting oil is supplied from a main shaft (not shown) to the supply hole 10 through the pull stud 20, and is further ejected from the spiral passage 7 through the relay groove 6 along the cutting edge 52 from the joint portion 53. Since the passage 7 is formed in a spiral shape, the cutting oil is increased in pressure at this portion, so that the scattering due to the centrifugal force due to the rotation during cutting is reduced.
[0013]
Next, the case where the drill 60 is used will be described. As shown in FIG. 3, the drill 60 is attached so that the joint portion 63 of the cutting edge 62 and the shank 61 is aligned with the cylindrical portion 8 outside the relay groove 6. In this case, the cutting oil reaches the relay groove 6 from the supply hole 10 and the passage 7, but since this portion is sealed by the fitting of the shank 61 and the cylindrical portion 8, the cutting oil is not ejected to the outside. The oil hole 64 of the drill 60 penetrates from the rear end surface of the shank 61 to the tip of the cutting edge 62, and the cutting oil is ejected from the oil hole 64.
[0014]
(Second Embodiment)
As shown in FIG. 4, the tool holder which is 2nd Embodiment of this invention changes the cutting oil path 7 formed in the internal peripheral surface 5 of the blade holding | maintenance part 4 from the spiral groove of the said 1st Embodiment to a straight groove | channel. It is a thing. Four passages 7 are formed at intervals of 90 ° in the circumferential direction. The other configuration is the same as that of the first embodiment, and the usage method and lubrication mode of the end mill 50 and the drill 60 are the same, and the description thereof is omitted.
[0015]
(Other embodiments)
In addition, the tool holder which concerns on this invention is not limited to the said embodiment, It can change variously within the range of this summary.
In particular, various means other than the screw 25 can be used to fix the end mill and the drill to the holding portion 4. Needless to say, the shape and number of the cutting oil supply passages 7 are arbitrary. Further, the cutting oil may be supplied from the outside to the supply hole 10 of the holder body 1 instead of from the main spindle of the machine tool.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a tool holder according to a first embodiment.
FIG. 2 is a sectional view showing a state in which an end mill is attached to the tool holder.
FIG. 3 is a cross-sectional view showing a state where a drill is attached to the tool holder.
FIG. 4 is a sectional view showing a tool holder according to a second embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Holder main body 2 ... Tapered shank part 4 ... Blade holding part 5 ... Inner peripheral surface 6 ... Cutting oil relay groove 7 ... Cutting oil passage 8 ... Cylindrical part 50, 60 ... Cutting blade 51, 61 ... Shank 52, 62 ... Cutting Blades 53, 63 ... joints

Claims (2)

In a tool holder having a taper shank portion attached to the spindle of a machine tool at the rear part of the holder main body, a blade holding part to which the cutting blade can be attached and detached at the front part, and supplying cutting oil to the cutting blade ,
Forming a cutting oil relay groove forming a ring-shaped recess on the inner peripheral surface of the tip of the blade holder,
The cutting oil passage is formed inside the relay groove on the inner peripheral surface of the blade holding portion, and the outer side of the relay groove is a cylindrical portion having the same diameter as the inner peripheral surface of the blade holding portion.
A tool holder characterized by that. The tool holder according to claim 1, wherein the cutting oil passage is a plurality of spiral grooves.

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