JP2001239420A - End mill, and cooling method of end mill head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an end mill and cooling method of the head of the end mill. SOLUTION: The cooling method is used to cool the head of an end mill body and a cutting edge 2 during cutting by forming a passage hole 11 for pressure fluid in the axial core of the end mill body to the proximity of the head 10, forming and penetrating a small-diameter hole 9 obliquely from a wall surface of a tip pocket provided at the head of the end mill body toward the passage hole for pressure fluid, and injecting the pressure fluid from the small-diameter hole toward the proximity of a top cutting edge corner 13. The end mill discharges chips filled in the tip pocket backwardly. A plurality of grooves for the pressure fluid flow out are provided angled relative to the top machining surface in the outer periphery near a flank relief of the cutting edge and the outer periphery back the cutting edge.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an end mill 1 in which an outer peripheral surface 3 near a flank of a cutting edge 2 of an end mill 1 and an outer peripheral surface 4 behind a cutting edge are formed with an inclined groove 5 or a slant groove 7 having a thin projection 6 interposed therebetween. And a small-diameter hole 9 slightly inward near the cutting edge corner 13.
And discharges chips filled in the chip pockets 8 with high efficiency while forcibly cooling the head of the end mill main body and the vicinity of the cutting edge corners 13 by ejecting the pressure fluid from the rear side, and at the same time, simultaneously releases the pressure fluid to the flank of the cutting edges 2. Nearby outer peripheral surface 3 and cutting blade 2
The present invention relates to an end mill 1 which is configured to pass through the inclined grooves 5 and 7 provided on a rear outer peripheral surface 4 and to flow out a pressurized fluid rearward.

[0002]

2. Description of the Related Art In a conventional end mill 1, for example, as shown in FIG. 5, a passage hole 11 for ejecting a pressurized fluid is formed so as to penetrate the center of the axis of the end mill 1 to a front end face, and cutting is performed. In general, a pressurized fluid is jetted toward the tip processing surface 12 to cool the tip cutting edge corner portion 13 and the tip pocket 8 and discharge chips generated behind. However, in the case of this conventional end mill 1, since the pressure fluid injected linearly toward the cutting surface 12 is inverted and discharged backward, the flow of the pressure fluid during cutting causes a turbulent flow and the cutting is performed. Since the blade 2 part flows out backward in a state where it cannot be cooled sufficiently, it is easy to cause early wear of the tip cutting blade 13 due to heat generated during cutting, and high-speed cutting in a state where the cooling of the cutting blade 2 is insufficient. Alternatively, when heavy cutting with a large depth of cut is performed, a seizure accident or breakage accident of the cutting edge 2 and the tip cutting edge 13 occurs, resulting in a disadvantage that machining efficiency is greatly reduced.

[0003]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned disadvantages of the prior art, and provides a groove 5 or a thin protrusion 6 on an outer peripheral surface 3 near a flank of a cutting blade 2 of an end mill 1 and an outer peripheral surface 4 behind a cutting blade.
Is formed, and a pressurized fluid is ejected from the small-diameter hole 9 slightly inward of the cutting edge corner 13 to forcibly cool the end mill 1 head and the vicinity of the cutting edge corner and fill the chip pocket. At the same time, chips are discharged to the rear with high efficiency, and at the same time, the pressurized fluid is passed through the inclined grooves 5 and 7 provided on the outer peripheral surface 3 near the flank of the cutting blade 2 and the outer peripheral surface 4 behind the cutting blade 2 to cut the cutting fluid 2. The end mill 1 has a configuration in which the cutting edge 2 other than the end mill 1 head 10 and the tip cutting edge corner 13 is further cooled while flowing to the rear on the flank side of the end mill. 13 is excellent cooling that can sufficiently cool the vicinity of 13 and other portions of the cutting edge 2 to greatly extend the service life of the head 10 and the cutting edge 2 of the end mill 1 and dramatically improve the cutting efficiency. It is possible to provide a mill 1.

[0004]

SUMMARY OF THE INVENTION An end mill 1 according to the present invention.
In the end mill 1, a passage hole 11 for the pressure fluid is narrowed to the vicinity of the head 10 in the axial center portion of the body of the end mill 1, while the passage for the pressure fluid is formed from the wall surface 15 of the tip pocket 8 provided in the head 10 of the end mill 1. An end mill head 10 and a cutting edge corner at the time of cutting are formed by drilling a small-diameter hole 9 in a diagonal direction toward the hole 11 so as to communicate therewith, and injecting a pressurized fluid from the small-diameter hole 9 toward the vicinity of the cutting edge corner 13. 13 and the other cutting edge 2 are forcibly cooled and the tip pocket 8 is cooled.
In the end mill 1 formed so as to discharge chips filled therein into the rear, a plurality of grooves 5 for pressure fluid outflow are provided on the outer peripheral surface 3 near the flank of the cutting blade 2 and the outer peripheral surface 4 behind the cutting blade 2.
And 7 are provided so as to be inclined with respect to the front end processing surface. The invention according to claim 2 is characterized in that the inclined grooves provided on the outer peripheral surface 3 near the flank of the cutting blade 2 and the outer peripheral surface 4 behind the cutting blade. 5 and 7 are formed in the range of 20 to 60 degrees with respect to the front end processing surface, and the invention according to claim 3 is characterized in that the outer peripheral surface 3 near the flank of the cutting blade 2 and the outer peripheral surface 4 behind the cutting blade 4. The cross-sectional shape of each of the inclined grooves 5 and 7 provided at a plurality of positions is a circular groove, a V-shaped groove, a square groove, or a plurality of grooves interposed with protrusions. An extension line of the center line of the small-diameter hole communicating with the passage hole is a small-diameter hole provided so as to be located inside the tip cutting edge corner, and the center line of the small-diameter hole is an end mill. Before tilting and tilting in the range of 10 to 30 degrees with respect to the axis center line of 1 The extension of the center line of the small diameter hole is formed so as to be positioned inside the tip cutting edge corner, and the invention according to claim 6 is connected to the pressure fluid passage hole and inside the tip cutting edge corner 13. The pressure fluid injected into the tip pocket from the small-diameter hole inclined toward the end mill collides with the end mill main body head 10 and the vicinity of the cutting edge corner 13 and then flows backward, and the outer peripheral surface near the flank of the cutting edge 2. The present invention relates to a method of cooling the end mill head 10 and the cutting blade 2, characterized in that they are configured to pass through the inclined grooves 5 and 7 provided on the outer peripheral surface 4 behind the cutting blade 3 and the cutting blade and to discharge the cutting blade 2 to the rear.

[0005]

DETAILED DESCRIPTION OF THE INVENTION In an end mill 1 of the present invention, a passage hole 11 for a pressure fluid is drilled in the axial center portion of an end mill 1 main body to a position near a head 10, while a tip provided in the head 10 of the end mill 1 is provided. A small-diameter hole 9 is formed obliquely from the wall surface 15 of the pocket 8 toward the pressure fluid passage hole 11 so as to communicate therewith, and the outer peripheral surface 3 near the flank of the cutting blade 2 provided at the end of the end mill 1. In addition, inclined grooves 5 and 7 are provided on the outer peripheral surface 4 at the rear portion of the cutting edge, and when the pressure fluid is jetted from the small-diameter hole 9 toward the tip cutting edge corner 13, the pressure fluid is in the vicinity of the tip cutting edge 2 performing cutting. After colliding with the cutting edge, it is ejected backward and discharged, and passes through the outer peripheral surface 3 near the flank of the cutting blade 2 and the inclined grooves 5 and 7 provided on the outer peripheral surface 4 at the rear part of the cutting blade. It will be discharged backward while forcibly cooling the blade 2 So the end mill 1 is constructed in, the end mill head 10 sufficient cooling near the end mill head 10 and the cutting edge corner 13, and the other cutting edge 2 parts to obtain
In addition, the life of the cutting blade 2 can be greatly extended, and there is an excellent advantage that a drastic improvement in cutting efficiency can be obtained.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an end mill according to an embodiment of the present invention; FIG. FIG. 2 is a front view of the end mill 1 shown in FIG. 1, FIG. 3 is a side view of the end mill 1 shown in FIG.
FIG. 3 is an explanatory diagram of a state where cutting is performed using the end mill 1 of the present invention. 5 and 6 are explanatory views showing a conventional end mill. The embodiment of the present invention shown in FIGS. 1 to 4 shows a slow-way type three-flute end mill.
It is needless to say that the present invention is not limited to a single blade and can be applied to an end mill provided with a plurality of blades of two or more blades, and can also be applied to a brazing type end mill and a solid type end mill.

Hereinafter, the end mill 1 of the present invention will be described.
The head 10 of the end mill 1 is provided with two or more cutting blades 2 and a tip pocket 8, and a passage hole 11 for a pressure fluid is provided in the axial center portion of the end mill 1 body up to the vicinity of the head 10. A small-diameter hole 9 is formed obliquely from the wall surface 15 of the 8 toward the passage hole 11 and communicates with the passage hole 11. An extension of the center line of the small diameter hole 9 is provided so as to be located slightly inside the cutting edge corner 13 of the tip cutting edge 2, and a pressure fluid is jetted toward the vicinity of the cutting edge 2, and the head 10 of the end mill main body and The cutting edge 13 and other portions of the cutting edge 2 are formed so as to be cooled. The angle of the center line of the small diameter hole 9 is 1 with respect to the center line of the end mill 1.
It is formed so as to be located in the range of 0 to 30 degrees and inside the cutting edge corner 13, and the position and direction of the center line of the small diameter hole 9 on the rake face are determined by the wall surface 15.
The position of the center line of the small diameter hole 9 is regulated so that the pressure fluid flowing out of the small diameter hole 9 provided on the cutting edge 2 reaches the vicinity of the cutting edge corner 13 while flowing on the rake face of the cutting edge 2.

When viewed from the front, the pressure fluid hits the vicinity of the cutting edge corner 13 on the outer peripheral surface 3 near the flank of the cutting edge 2 and the outer peripheral surface 4 behind the cutting edge located between the respective chip pockets 8. After passing through the vicinity of the cutting blade 2, a plurality of grooves 5 are provided from the front end of the head to the vicinity of the rear end of the tip pocket 8 as shown in FIG.
Is inclined within a range of 20 degrees to 60 degrees with respect to the front end processing surface 12, and if the angle is selected according to the quality of the flow of the pressure fluid due to the change in the cutting edge shape and the inclined groove 5 is formed. good. The shape of the groove 5 may be any of a round groove, a V groove, and a square groove, or may be a shape in which a thin projection 6 is interposed and grooves 7 are provided on both sides thereof as shown in FIG. .
Further, the rear ends of the outer peripheral surfaces 3 and 4 may be provided with a clearance 14 for further improving the flow of the pressure fluid.

[0009]

As described above, the end mill 1 of the present invention is used.
In the end mill 1, a passage hole 11 for pressure fluid is drilled to the vicinity of the head 10 in the axial center portion of the end mill 1, while the passage for pressure fluid passes through a wall surface 15 of the chip pocket 8 provided in the head 10 of the end mill 1. A small-diameter hole 9 is formed in a diagonal direction toward the hole 11 so as to communicate therewith. Also, an inclined groove 5 is formed in the outer peripheral surface 3 near the flank of the cutting blade 2 provided at the end of the end mill 1 and the outer peripheral surface 4 in the rear part of the cutting blade. When pressure fluid is injected from the small-diameter hole 9 toward the head 10 and the tip cutting corner 13 of the end mill 1, the pressure fluid collides with the vicinity of the tip cutting edge 2 which is performing cutting. It is inverted backward and discharged with high efficiency, and passes through the outer peripheral surface 3 near the flank of the cutting blade 2, the inclined groove 5 provided in the outer peripheral surface 4 behind the cutting blade 2, and the outer peripheral surface 7 behind the cutting blade 2. End mill 1 that is configured to discharge backward. Sufficient cooling of the head 10 and the vicinity of the cutting edge corner 13 and the cutting edge 2 portion of the main body of the mill 1 makes it possible to greatly extend the life of the head 10 and the cutting edge 2 of the end mill 1 and dramatically improve the cutting efficiency. It is possible to provide the end mill 1 having the obtained excellent advantages.

[Brief description of the drawings]

FIG. 1 is a plan view of an end mill 1 according to the present invention.

FIG. 2 is a front view of the end mill 1 shown in FIG.

FIG. 3 is a side view of the end mill 1 shown in FIG.

FIG. 4 is an explanatory view of a state where cutting is performed using the end mill 1 of the present invention.

FIG. 5 is a plan view of a conventional end mill 1.

FIG. 6 is a front view of the conventional end mill 1 shown in FIG.

[Explanation of symbols]

1. End mill 2. Cutting blade 3. The outer peripheral surface near the flank of the cutting blade 2. 4. 4. Outer peripheral surface at the rear of cutting blade 2 5. Inclined groove on outer peripheral surface 3 6. Thin projections 7. Inclined groove on outer peripheral surface 7 Tip pocket 9. Small hole 10. 10. Head of end mill 1 11. Passage holes for pressure fluid Tip processing surface 13. Cutting edge corner 14. Nusumi 15. Wall of chip pocket a. FIG. 4 is a side sectional view of the groove 5 and the groove 7 in the α direction in FIG. b. FIG. 4 is a side sectional view of a protrusion 6 showing another embodiment in the α direction in FIG. 3.

Claims (6)

[Claims] 1. A pressure hole for a pressure fluid is drilled in the axial center portion of an end mill body up to the vicinity of a head, while a wall of a tip pocket provided in a head of the end mill body is directed toward the pressure fluid passage hole. A small-diameter hole is obliquely formed in the diagonal direction to allow communication, and a pressure fluid is jetted from the small-diameter hole toward the vicinity of the tip cutting edge corner to cool the head and the cutting edge of the end mill body at the time of cutting and to insert the chip. In an end mill formed so as to discharge chips filled in a pocket to the rear, a plurality of grooves for pressure fluid outflow are formed on the outer peripheral surface near the flank of the cutting blade and on the outer peripheral surface behind the cutting blade with respect to the tip processing surface. An end mill characterized by being provided at an angle. 2. The method according to claim 1, wherein the inclined grooves provided on the outer peripheral surface in the vicinity of the flank of the cutting edge and on the outer peripheral surface behind the cutting edge are formed in the range of 20 to 60 degrees with respect to the front end processing surface. End mill according to item. 3. The inclined groove provided on the outer peripheral surface in the vicinity of the flank of the cutting blade and on the outer peripheral surface behind the cutting blade has a sectional shape in which a plurality of grooves having a V-shaped groove, a circular groove, a square groove, or a thin projection are interposed. The end mill according to claim 1, wherein the end mill is provided. 4. An apparatus according to claim 1, wherein an extension of a center line of the small-diameter hole communicating with the passage hole for the pressure fluid is provided inside the corner of the tip cutting edge. End mill as described. 5. The center line of the small diameter hole is formed so as to be inclined in the range of 10 ° to 30 ° with respect to the axis center line of the end mill, and the extension line of the center line of the inclined small diameter hole is from the tip cutting edge corner. 5. The end mill according to claim 1, wherein the end mill is formed so as to be positioned inside. 6. The pressure fluid which is communicated with the pressure fluid passage hole and is injected into the tip pocket from the small diameter hole which is inclined inward from the tip cutting edge corner, collides with the vicinity of the cutting edge corner, and then rearward. Characterized in that it is discharged to the rear by passing through an inclined groove provided in the outer peripheral surface near the flank of the cutting edge and the outer peripheral surface behind the cutting edge. Blade cooling method.