JPH10507A - Chamfering tool and chamfering method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform chamfering in a manner of general purpose of a multifarious angular part of a workpiece including an opening edge of a hole not in parallel to a tool axial line and even an opening edge of a hole in a crossing part. SOLUTION: A chamfering tool 11 is constituted by a mounting part 12, shank part 13 and a spherical part 14. The spherical part 14 is formed in a diameter larger than a shank diameter, and in its surface, a cutting edge 14a is formed. This chamfering tool 11 is used, the spherical part 14 makes a circular motion in a horizontal surface, and an opening edge 3a of a vertical hole 3 is chamfered. In the case of an opening edge 4a of a horizontal hole 4, the spherical part 14 makes a circular motion in a vertical surface. In the case of opening edges 4b, 4c in a crossing part of the vertical/horizontal holes 3, 4, the shank part 13 and the spherical part 14 are inserted to the vertical hole 3, and the spherical part 14 makes a circular motion in a vertical surface. When the horizontal hole 4 is in a diameter smaller than the spherical part 14, it is linearly moved on a center line of the horizontal hole 4, and the opening edges 4a, 4b, 4c are chamfered.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool which is attached to a main shaft of a machine tool and chamfers a corner of a work, and a method for chamfering a hole of the work using the tool.

[0002]

2. Description of the Related Art For example, in the case of a work 1 as shown in FIG. 10, a corner 2 on an outer shape and an opening edge of holes 3 and 4 are chamfered by a rotary tool 23 attached to a main shaft 22 of a machine tool 21. . Conventionally, when chamfering the vertical hole 3 parallel to the tool axis, as shown in FIG. 11, a rotary tool 23 such as a drill having a larger diameter than the vertical hole 3 is used, and the tool 23 is moved on the center line of the vertical hole 3. In addition, the opening edge 3a of the vertical hole 3 has been cut by the cutting edge 23a on the tool tip surface.

[0003]

However, according to the conventional rotary tool 23, since the cutting edge 23a is provided on the tip end surface of the tool 23, the opening edge 4a of the lateral hole 4 not parallel to the tool axis is chamfered. In addition, it was necessary to change the direction of the work 1 or the tool 23. Also, when the vertical hole 3 and the horizontal hole 4 intersect inside the work 1, it is impossible to chamfer the opening edges 4b and 4c of the horizontal hole 4 at the intersection. In particular, when the horizontal hole 4 is smaller in diameter than the vertical hole 3, burrs tend to remain on the opening edges 4b and 4c at the time of drilling. If this portion cannot be chamfered, the burrs will hinder the insertion of interior parts such as shafts, There is a problem that the sealing material such as the O-ring is damaged by burrs.

Accordingly, an object of the present invention is to provide a novel chamfering tool and a surface which can be used for a wide variety of corners of a work, including an opening edge of a hole not parallel to the tool axis and an opening edge of a hole at an intersection. It is to provide a taking method.

[0005]

In order to solve the above-mentioned problems, a chamfering tool according to the present invention is a rotatable tool which is attached to a main shaft of a machine tool and chamfers a corner of a work,
A spherical portion having a diameter larger than the shank diameter is provided at the tip of the shank portion, and a cutting blade is formed on the surface of the spherical portion.

A chamfering method according to the present invention is a method for chamfering a hole in a work using the chamfering tool. When the hole has a smaller diameter than the spherical part of the chamfering tool, the center of the spherical part is the hole. The chamfering tool is controlled so as to move on substantially the center line of the hole, and the opening edge of the hole is cut by the cutting blade (claim 2).
When the diameter of the hole is larger than that of the spherical portion, the chamfering tool is controlled according to the shape of the opening edge of the hole (claim 3).

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment of a chamfering tool. The chamfering tool 11 is a rotary tool for chamfering a corner of a work, and has a mounting portion 12 at a base end.
And an intermediate shank portion 13 and a spherical portion 14 at the tip. The mounting part 12 is a main shaft 22 of a machine tool 21.
Via a holder 24 (see FIG. 10).
The shank portion 13 is formed in an elongated cylindrical shape having a smaller diameter than the mounting portion 12. The spherical portion 14 is formed at the tip of the shank portion 13 with a diameter larger than the shank diameter, and has a cutting edge 14 on its surface.
a is formed.

FIGS. 3 and 4 show a typical embodiment of the chamfering method. As shown in FIG. 3, when chamfering the side hole 4 of the work 1, if the side hole 4 has a smaller diameter than the spherical portion 14 of the chamfering tool 11,
1, the tool 11 is controlled so that the center of the spherical portion 14 moves linearly on the center line of the lateral hole 4, and the cutting edge 14a cuts the opening edge 4a of the lateral hole 4. When the horizontal hole 4 is considerably smaller than the spherical portion 14, the center of the spherical portion 14 may be slightly shifted from the center line of the horizontal hole 4, and strict positioning accuracy is not required.

As shown in FIG. 4, when the lateral hole 4 has the same diameter as the spherical portion 14 or has a larger diameter, the same chamfering tool 11 is used.
The tool 11 is controlled so as to follow the shape of the opening edge 4a of the lateral hole 4 so that the spherical portion 14 is moved circularly around the center line of the lateral hole 4, and the cutting edge 14a cuts the opening edge 4a. In the case of a numerically controlled machine tool, the copying control of the chamfering tool 11 can be easily performed by creating a machining program corresponding to the opening edge shape of the lateral hole 4.

Therefore, according to the chamfering tool 11 and the chamfering method, by using one kind of the chamfering tool 11 and controlling it in two ways, the small and large-diameter lateral holes 4 orthogonal to the tool axis can be obtained. Can be easily chamfered. Further, since the spherical portion 14 is formed to have a larger diameter than the shank diameter, there is no possibility that the shank portion 13 will interfere with the side surface of the work 1.

FIGS. 5 to 9 show a more specific embodiment of the chamfering method. As shown in FIG.
In the case of the work 1 having the same shape as the above, a chamfering tool 11 having a spherical portion 14 smaller in diameter than the vertical hole 3 is used. When chamfering the opening edge 3a of the vertical hole 3, the spherical portion 14 is moved circularly in a horizontal plane. When chamfering the opening edge 4a of the side hole 4,
The spherical portion 14 is moved circularly in a vertical plane. When chamfering the opening edges 4b and 4c of the horizontal hole 4 at the cross intersection of the vertical hole 3 and the horizontal hole 4, the shank portion 13 and the spherical portion 14 are inserted into the vertical hole 3, and the spherical portion 14 is moved circularly in a vertical plane. Side hole 4
Is smaller than the spherical portion 14, the spherical portion 14 is
Are linearly moved on the center line of, and the opening edges 4a, 4b, 4c are chamfered. In this case, the four opening edges 3a, 4a, 4b, 4c are sequentially chamfered with one kind of chamfering tool 11,
Burrs can be removed.

As shown in FIG. 6, when the horizontal hole 4 intersects the vertical hole 3 in a T-shape, the opening edge 4b of the horizontal hole 4 is chamfered in the same manner as described above. As shown in FIG.
When the oblique crossing is made, since the opening edges 4b and 4c of the horizontal hole 4 at the crossing portion have an elliptical shape, the chamfering tool 11 is controlled by the numerical control machine tool so that the spherical portion 14 is opened inside the vertical hole 3. By moving along the circle, the opening edges 4b, 4
Each part of c can be chamfered uniformly.

As shown in FIG. 8, even when the vertical holes 6, 7 and the inclined hole 8 are opened on a surface inclined with respect to the tool axis, each hole 6, 7, 8 using the same chamfering tool 11. Opening edges 6a, 7a, 8a can be chamfered. However,
In this case, it is necessary to pay attention to the cut portion of the spherical portion 14. That is, as shown in FIG. 9, when the vicinity of the point G of the opening edge 8 a is cut at the center of the spherical portion 14, the cutting edge 14 a comes into point contact with the work 1 and the cutting speed is significantly reduced, so that the cutting efficiency is poor. , The cutting blade 14a may be damaged. On the other hand, since the vicinity of the point H is the maximum diameter portion of the spherical portion 14, the cutting speed is high and the cutting efficiency is good. Therefore, when chamfering the inclined opening edge 8a, it is necessary to set the rotation speed of the chamfering tool 11 so that such a difference in the cutting speed does not hinder the machining.

In each of the above embodiments, the method of chamfering the opening edge of the hole has been described. However, the chamfering tool of the present invention can be applied to chamfering of the edge 2 (see FIG. 10) on the outer shape of the work. In addition, various corners of each part of the work can be chamfered for general use. Further, the configuration and the shape of each part of the chamfering tool can be appropriately changed without departing from the spirit of the present invention.

[0015]

As described above in detail, according to the chamfering tool and the chamfering method of the present invention, the opening edge of the hole not parallel to the tool axis and the opening edge of the hole at the intersection are included. An excellent effect is obtained that various corners can be chamfered for general use.

[Brief description of the drawings]

FIG. 1 is a front view of a chamfering tool showing an embodiment of the present invention.

FIG. 2 is a bottom view of the chamfering tool.

FIG. 3 is a cross-sectional view showing a method of chamfering a small-diameter side hole with the chamfering tool.

FIG. 4 is a cross-sectional view showing a method of chamfering a large-diameter lateral hole using the chamfering tool.

FIG. 5 is a cross-sectional view showing a method of chamfering a cross intersection of a hole with the chamfering tool.

FIG. 6 is a cross-sectional view showing a method of chamfering a T-shaped intersection of a hole with the chamfering tool.

FIG. 7 is a cross-sectional view showing a method of chamfering an oblique portion of a hole using the chamfering tool.

FIG. 8 is a cross-sectional view showing a method of chamfering an inclined opening edge of a hole using the chamfering tool.

FIG. 9 is an enlarged sectional view showing an inclined opening edge of FIG. 8;

FIG. 10 is a partial perspective view of a machine tool showing a workpiece shape.

FIG. 11 is a sectional view showing a conventional chamfering method.

[Explanation of symbols]

1. Work, 2 ... Square edge, 3 ... Vertical hole, 3a ... Opening edge, 4 ... Horizontal hole, 4a, 4b, 4c ... Opening edge, 6 ...
Vertical hole, 6a ... opening edge, 7 ... vertical hole, 7a ... opening edge,
8 ... Slope hole, 8a ... Opening edge, 11 ... Chamfer tool, 1
2 ··· Mounting part, 13 ·· Shank part, 14 ··· Spherical part,
14a cutting blade, 21 machine tool, 22 spindle.

Claims (3)

[Claims] 1. A rotatable tool which is attached to a main shaft of a machine tool and chamfers a corner portion of a work, wherein a spherical portion having a diameter larger than a shank diameter is provided at a tip of a shank portion, and a cut is formed on a surface of the spherical portion. A chamfering tool with a blade. 2. A method for chamfering a hole in a work using the chamfering tool according to claim 1, wherein the center of the spherical portion is substantially the center of the hole when the hole has a smaller diameter than the spherical portion of the chamfering tool. A chamfering method comprising controlling a chamfering tool so as to move on a line and cutting an opening edge of a hole by a cutting blade. 3. A method for chamfering a hole in a work using the chamfering tool according to claim 1, wherein, if the hole has a diameter larger than the spherical portion of the chamfering tool, the chamfering tool is moved to the opening edge of the hole. A chamfering method characterized by controlling the shape according to a shape and cutting an opening edge of a hole by a cutting blade.