JPH08155736A - Rotating cutting tool - Google Patents

Abstract

PURPOSE: To reduce manufacturing cost by drilling an injection hole easily. CONSTITUTION: A reamer 10 is provided with groove parts 24a-24d which are cut and formed along the axial direction from the end part of a cutter part 18 to shank part side and discharges cutting chips cut out from the cutter part 18, and injection holes 28a-28d which communicates with a pressure fluid feed hole 26 by increasing the cut amount of cutting chips discharging groove parts 24a-24d along the axial direction or the radial direction, and are formed by forming holes in the inner wall surface of the cutting chips discharging groove parts 24a-24d.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary cutting tool such as a reamer and an end mill, and more specifically, extends in the axial direction from the rear end side of the shank portion to the vicinity of the cutting edge portion. The present invention relates to a rotary cutting tool having a pressure fluid supply hole defined therein.

[0002]

5 to 7 show a rotary cutting tool according to the prior art. For example, in the rotary cutting tool 1 such as a reamer, a pressure fluid supply hole 3 extending in the axial direction from the rear end side of the shank portion to the vicinity of the cutting edge portion 2 is defined, and the cutting edge portion 2 is further defined. On the inner wall surface of the cutting waste discharge groove 5 defined between the four chips 4 provided at right angles to each other, the pressure fluid is provided through a communication hole 6 inclined by a predetermined angle with respect to the axis. Four injection holes 7 communicating with the supply hole 3 are provided. By supplying a pressure fluid (for example, cutting fluid or air) from a pressure fluid supply source (not shown) through the pressure fluid supply hole 3, the cutting edge portion 2 is cooled, lubricity is improved, and cutting debris is obtained. Can be discharged.

When the cutting tool body constituting the rotary cutting tool 1 is formed of a cemented carbide material (sintered body), the injection hole 7 is formed by an electric discharge machining method.
Alternatively, the injection holes 7 are formed by a drilling method at the time of temporary sintering.

[0004]

However, in the rotary cutting tool 1 according to the above-mentioned prior art, since the diameter of the injection hole 7 is defined by a plurality of small-diameter hole portions of about 1 mm, the injection hole 7 There is a disadvantage that the drilling work of No. 7 becomes complicated and, as a result, the manufacturing cost rises.

The present invention has been made to overcome the above-mentioned inconveniences, and it is an object of the present invention to provide a rotary cutting tool capable of easily forming injection holes to reduce the manufacturing cost. To aim.

[0006]

In order to achieve the above object, the present invention comprises a cutting blade portion and a shank portion, and extends axially from the rear end side of the shank portion to the vicinity of the cutting blade portion. A rotary cutting tool in which a pressure fluid supply hole extending along the same is defined, and is formed by notching along the axial direction from the tip end portion of the cutting edge portion to the shank portion side, and from the cutting edge portion The cutting fluid discharge groove portion that discharges the cut cutting waste to the outside, and the pressure fluid supply hole by increasing the cutout amount of the cutting waste discharge groove portion along the axial direction or along the radially outer direction. A pressure fluid lead-out hole which is communicated with and is defined by opening on the inner wall surface of the cutting waste discharging groove, and the pressure fluid is led out to the cutting surface through the pressure fluid lead-out hole. To do.

[0007]

In the rotary cutting tool according to the present invention, the cutting edge portion is brought into contact with the work, and the rotary cutting tool is rotationally driven through the drive source. As a result, the cutting edge portion cuts the work, and the cutting waste is discharged to the outside through the cutting waste discharging groove.

In the manufacturing process of the rotary cutting tool according to the present invention, when the cutting fluid discharge groove is formed after the pressure fluid supply hole extending in the axial direction to the vicinity of the cutting portion is drilled in advance, A pressure fluid communicating with the pressure fluid supply hole and opening on the inner wall surface of the cutting waste discharging groove by increasing the notch amount of the cutting waste discharging groove along the axial direction or along the radially outer direction. An outlet hole is defined. Therefore, it is not necessary to dare to perform the step of forming the pressure fluid lead-out hole. According to this structure, when the work is cut by the cutting edge portion, the pressure fluid is led to the cutting surface through the pressure fluid lead-out hole, the cutting edge portion is prevented from being worn, and the cutting process is smoothly performed. It becomes possible to carry out.

[0009]

The preferred embodiments of the rotary cutting tool according to the present invention will now be described in detail with reference to the accompanying drawings.

FIG. 1 is a front view of a reamer according to an embodiment of the present invention, FIG. 2 is a view seen from the direction of arrow A in FIG. 1, and FIG.
FIG. 4 is a partially enlarged view of FIG. 1, and FIG. 4 is a partial perspective view of a cutting blade portion.

The reamer 10 has a shank portion 12 formed in a cylindrical shape and a first to a fourth tip 1 having a cutting edge 14.
6a to 16d are composed of the cutting edge portions 18 respectively fixed to the tip seats by fixing means such as brazing. The first
~ The fourth tips 16a to 16d are fixed to the tip seat formed on the cutting edge portion 18 in a state of being substantially orthogonal to each other.
~ The first to fourth flanks 20 are inclined at a predetermined angle to the portions of the fourth chips 16a to 16d that are close to each other in the opposite direction to the rotation direction.
a to 20d are formed respectively. In addition, the plane portions including the upper surface portions of the first to fourth chips 16a to 16d are respectively the first to the first.
The fourth rake faces 22a to 22d are formed, and the first to fourth rake faces are formed.
Scoop surface 22a-22d and 1st-4th flank surface 20a-2
0d to the shank portion 1 from the tip of the cutting edge portion 18
The groove portion 2 for discharging the first to fourth cutting wastes is formed by extending a predetermined length (see FIG. 3) along the axial direction toward the second side and making a notch.
4a to 24d are formed.

A pressure fluid supply hole 26 extending from the rear end of the shank portion 12 along the axial direction to the vicinity of the cutting edge portion 18 is defined (see broken lines in FIGS. 1 to 3), and the first ~ By cutting a predetermined length along the axial direction from the tip of the cutting blade 18 toward the shank 12 to form the fourth cutting waste discharging grooves 24a to 24d, the end of the pressure fluid supply hole 26 is formed. The inner peripheral wall of the site is opened, and first to fourth injection holes 28a to 28d (pressure fluid outlet holes) communicating with the pressure fluid supply hole 26 are defined (see FIGS. 2 and 3).

The reamer 10 according to the embodiment of the present invention is basically constructed as described above. Next, its function and effect will be explained.

First, a method of manufacturing the reamer 10 will be described. A pressure fluid supply hole 26 extending from the rear end side of the shank portion 12 to the vicinity of the cutting edge portion 18 along the axial direction is bored through a boring means (not shown). Then, the cutting edge part 1
The first to fourth cutting waste discharging groove portions 24a to 24d are formed by cutting out from the tip portion of 8 toward the shank portion 12 along the axial direction by a predetermined length.

In this case, the cutting waste discharging groove 24a is formed.
The ends of (24b to 24d) reach the end of the inner peripheral wall of the pressure fluid supply hole 26, and further, the pressure fluid supply hole 26
The injection holes 28a (28b to 28d) communicating with the pressure fluid supply hole 26 are defined by increasing the notch amount until the opening communicating with the pressure fluid supply hole 26 is defined. The cutout amount T of the reamer 10 according to the present embodiment is compared with the cutout amount D of the rotary cutting tool 1 according to the related art shown in FIG.
Greater.

In this manner, the first to fourth cutting waste discharging groove portions 24a to 24d are formed so as to be orthogonal to each other at about 90 °. Next, the first to fourth cutting waste discharging groove portions 24a to 2
First, a chip seat is formed on each plane portion of 4d, and then a cutting edge 14 is provided on the chip seat through a fixing means such as brazing.
~ Reamer 10 by fixing the fourth chips 16a ~ 16d respectively
Is completed.

Therefore, in the reamer 10 according to this embodiment,
Unlike the rotary cutting tool 1 according to the related art, the manufacturing process does not particularly require a step of forming the injection holes 28a to 28d, and the cutting waste discharging groove 24a (24b to 24d).
Since it suffices to increase the notch amount of, it can be easily manufactured. As a result, it is possible to reduce the manufacturing cost along with the reduction of the manufacturing process.

Next, the reamer 1 manufactured in this way
A case in which a work (not shown) is drilled by 0 will be described.

A hole is previously formed in the work by a drilling means such as a drill. Further, a cutting fluid supply means (not shown) is connected to the pressure fluid supply hole 26 via a tube or the like.

Next, after fixing the shank portion 12 to a rotary drive source (not shown), the reamer 10 rotates at high speed in the arrow direction (see FIG. 2) under the driving action of the rotary drive source. Therefore, by displacing the cutting edge portion 18 of the reamer 10 along the hole drilled by the drill,
The cutting edge portion 18 starts cutting on the inner wall surface of the hole.
That is, the cutting blades 14 formed on the first to fourth tips 16a to 16d forming the cutting blade portion 18 cut the inner wall surface of the hole to derive cutting wastes, and the cutting wastes are the first to fourth respectively. It is discharged to the outside along the first to fourth cutting waste discharging groove portions 24a to 24d through the fourth rake faces 22a to 22d. Simultaneously with the cutting process, a cutting fluid supply means (not shown) is urged to supply the cutting fluid (pressure fluid) to the pressure fluid supply hole 26. The cutting fluid introduced into the pressure fluid supply hole 26 is jetted from the first to fourth injection holes 28a to 28d defined in the first to fourth cutting waste discharging groove portions 24a to 24d, and the cutting portion of the work piece is cut. Supply cutting fluid to. The cutting fluid is preferably introduced into the inner wall surface of the work holed by the reamer 10 to prevent wear of the cutting edges 14 of the first to fourth tips 16a to 16d and improve lubricity.

[0021]

According to the rotary cutting tool of the present invention, the following effects can be obtained.

That is, unlike the rotary cutting tool according to the prior art, a step of forming a pressure fluid lead-out hole is not particularly required in the manufacturing process thereof, and it is only necessary to increase the cutout amount of the cutting waste discharging groove. Therefore, it can be easily manufactured. As a result, it is possible to reduce the manufacturing cost along with the reduction of the manufacturing process.

[Brief description of drawings]

FIG. 1 is a front view of a reamer according to an embodiment of the present invention.

FIG. 2 is a view seen from the direction of arrow A in FIG.

FIG. 3 is a partially enlarged view of FIG. 1;

FIG. 4 is a partial perspective view of a cutting blade portion of the reamer of FIG.

FIG. 5 is a partial front view of a rotary cutting tool according to a conventional technique.

6 is a view seen from the direction of arrow B in FIG.

FIG. 7 is a partial perspective view of a cutting edge portion of the rotary cutting tool of FIG.

[Explanation of symbols]

10 ... Reamer 12 ... Shank part 14 ... Cutting edge 16a-16d ...
Chip 18 ... Cutting edge parts 20a-20d ...
Flank surface 22a-22d ... Rake surface 24a-24d ...
Grooves for discharging cutting chips 26 ... Pressure fluid supply holes 28a to 28d ...
Injection hole

Claims (1)

[Claims] 1. A rotary cutting tool comprising a cutting edge portion and a shank portion, and defining a pressure fluid supply hole extending along the axial direction from the rear end side of the shank portion to the vicinity of the cutting edge portion. That is, a cutting waste discharge groove portion that is formed by cutting out from the tip end portion of the cutting blade portion along the axial direction to the shank portion side, and discharges the cutting waste cut out from the cutting blade portion to the outside, By increasing the cutout amount of the chip discharge groove along the axial direction or along the radial outer direction, the cut chip discharge groove is communicated with the pressure fluid supply hole and opened on the inner wall surface of the chip discharge groove. A rotary cutting tool comprising: a pressure fluid lead-out hole formed therein; and leading out the pressure fluid to the cutting surface through the pressure fluid lead-out hole.