JPS6113926B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a tool for chamfering the end face of a hole.

[Technical background of the invention and its problems]

Conventional chamfering of the end face of a hole is performed using a drill or equivalent tool with an angled tip. For example, chamfering the inner end surface of a hole penetrating the inside of a cylindrical body such as a pipe can be done using a corner drill, etc., but if the pipe diameter is small or the hole to be chamfered is located deeper than the end surface of the pipe, There are some inconveniences that make it inapplicable in some cases. Another method involves chamfering the end of the hole inside the pipe by using a special spring that draws a restorable tool into the hole from outside the pipe, but this method is inconvenient because the range of application of one tool is extremely limited. be.

[Purpose of the invention]

An object of the present invention is to provide a tool for chamfering a hole end surface, which has an extremely simple structure and is suitable for chamfering the inner hole end surface of a small diameter pipe.

[Summary of the invention]

The tool for chamfering a hole end surface of the present invention includes a sphere integrally provided at the end of a rotating shaft, a hole being formed in this sphere at an angle with respect to the axis of the rotating shaft, and a hole being formed by drilling the hole. The structure is characterized in that the sharp edge formed at the periphery of the opening of the hole is used as the cutting edge, and by pressing the sphere against the end face of the hole and rotating the rotating shaft, the cutting edge at the periphery of the opening of the hole Chamfer the hole end.

[Embodiments of the invention]

Hereinafter, the present invention will be explained in detail with reference to embodiments shown in the drawings.

As shown in FIGS. 1 and 2, a spherical body 2 having a diameter larger than the shaft diameter of the rotating shaft 1 is integrally provided at the end of the rotating shaft 1. As shown in FIGS. This sphere 2 is made of suitable tool steel, super hard alloy, or the like. A hole 3 of an appropriate diameter is bored through this sphere 2 at a certain angle to the axis of the rotating shaft 1, and a hole 3 of an appropriate diameter is formed at the opening periphery of both ends of the hole 3. The acute angle portions of the spherical surface are circular cutting edges 4 and 5.

Then, as shown in FIG. 3, when chamfering the hole end surface 13 at the outer end of the round hole 12 drilled in the member 11, the rotating shaft 1 is coaxially placed above the round hole 12. In this position, the lower surface of the sphere 2 is pressed and fitted into the hole end surface 13, and the rotary shaft 1 is rotated by an electric drill, a drilling machine, etc., so that the annular cutting edge 4 on one side of the sphere 2 is pressed against the hole end surface 13. Cut the chamfer. Note that the member 11 may be flat or pipe-shaped.

Further, as shown in FIG. 4, when chamfering the hole end surface 23 at the inner end of the round hole 22 bored in the pipe member 21, the rotating shaft 1 is moved along the inner circumferential surface 24 from the opening at one end of the pipe member 21. By pressing the side surface of the sphere 2 against the hole end face 23 and fitting it, and rotating the rotating shaft 1, the annular cutting edges 4 and 5 on one side and the other side of the sphere 2 are alternately inserted. The hole end face 23 is chamfered.

In addition, the rotating shaft 1, the axis center, and the hole 1 to be chamfered
In the case shown in Fig. 3, the axes 2 and 22 are set to be the same axis, and in the case shown in Fig. 4, they are set at right angles. The rotating shaft 1 may be rotated by setting it to any tilted state within the range up to the following state.

〔Effect of the invention〕

According to the present invention, a spherical body is integrally provided at the end of the rotating shaft, a hole is formed in the spherical body at an angle with respect to the axis of the rotating shaft, and the opening periphery of the hole is It has an extremely simple structure, with the sharp corner formed at the tip serving as the cutting edge.
It is also possible to easily chamfer the inner end surface of a hole drilled in a small diameter pipe, as well as the end surface of the hole that appears on the outside.

[Brief explanation of the drawing]

Fig. 1 is a side view showing one embodiment of the hole end chamfering tool of the present invention, Fig. 2 is a front view thereof, Fig. 3 is a sectional view showing its first usage example, and Fig. 4 is its second embodiment.
It is a sectional view showing an example of use. 1... Rotation axis, 2... Sphere, 3... Hole, 4,5
...The tip of the blade.

Claims (1)

[Claims] 1. A sphere is integrally provided at the end of the rotating shaft, a hole is bored through the sphere at an angle with respect to the axis of the rotating shaft, and by drilling this hole, a hole is formed at the opening periphery of both ends of the hole. A chamfering tool for chamfering the end surface of a hole, characterized in that each sharp corner is used as a cutting edge.