JPS6314975Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field of the invention] The present invention relates to a cutting tool used for chamfering a hole, and in particular to a chamfering tool that is versatile and capable of chamfering a machined hole with high precision. .

[Technical background of the invention and its problems]

A conventional chamfering tool for chamfering a machined hole drilled in a workpiece with a drill or reamer, etc. is an improved version of a twist drill, for example, as shown in Figure 3, and this chamfering tool has a chamfering cutter. An insertion guide part 3 is attached to the tip of a chamfering tool body 2 equipped with a blade 1.
are integrally formed to protrude. This insertion guide portion 3 is inserted into a machining hole during chamfering and guides the machining position of the chamfering tool. The depth of the chamfer is determined by adjusting the feed scale of the machine tool.

However, conventional chamfering tools are not versatile, so when chamfering is performed, a new chamfering tool must be prepared and prepared for each hole diameter. The manufacturing cost is relatively high, which impairs economic efficiency, and the chamfer depth depends on the individual operator's operation.
There are dimensional variations due to individual differences. Therefore, in order to improve the machining accuracy of chamfering,
It requires skilled workers and the chamfering process must be done carefully and with great care.
This is the reason why it takes a long time. In addition, if the size and dimensions of the chamfer are important for the functionality of the workpiece, problems such as quality problems may occur because it is difficult to eliminate variations due to individual differences among workers. Ta.

[Purpose of invention]

The present invention was developed in consideration of the above-mentioned circumstances, and it provides versatility to the chamfering tool, allows the chamfering tool to be accurately and easily set into various machined holes to be chamfered, and provides a highly accurate chamfering tool. The purpose of the present invention is to provide an economical chamfering tool that can perform chamfering.

Another purpose of the present invention is to improve the chamfering accuracy and improve the machining accuracy of the workpiece.
An object of the present invention is to provide a chamfering tool that improves the workability of chamfering.

[Summary of the idea]

In order to achieve the above-mentioned object, the chamfering tool according to the present invention has a chamfering tool equipped with a cutting blade, and a chamfering amount adjustment stopper that determines the chamfering depth is removably attached to the chamfering tool body equipped with the cutting blade. At the same time, a guide rod extending forward is integrally molded at the tip of the chamfering tool main body, and a guide spring is supported by the guide rod via a pair of fixed side and movable side bearings installed apart from each other in the axial direction. A double nut that engages with the movable side bearing and restricts movement of the movable side bearing along the axial direction of the guide rod is screwed to the guide rod, and the amount of expansion and deflection of the guide spring can be adjusted by the double nut. It is something.

[Example of idea]

Hereinafter, preferred embodiments of the chamfering tool according to the present invention will be described with reference to the accompanying drawings.

FIG. 1 is an overall view showing a chamfering tool according to the present invention, and reference numeral 10 in the figure indicates a tool body of the chamfering tool. The chamfering tool main body 10 has a cylindrical shape as a whole and has a Morse taper portion 11 formed on the base side, and is fixed to a chuck portion of a machine tool via the Morse taper portion 11. Chamfering tool body 1
A chamfering cutting edge 12 is formed at the tip of the 0, and this cutting edge 12 chamfers a machined hole 14 of a workpiece 13 machined with a drill, reamer, or the like.

On the other hand, a mounting step 15 is formed at the front of the chamfering tool main body 10, and a chamfer amount adjusting stopper 16 is detachably attached to the mounting step 15 from the front. A set screw 17 is screwed into the adjustment stopper 16, for example, at a position facing in the diametrical direction, and the set screw 17 is fixed by an adjustment nut 18 such as a hexagonal nut. The tip of the set screw 17 is attached to the mounting step 15
The chamfering amount adjusting stopper 16 is loosely engaged with the circumferential groove 19 formed in the chamfering amount adjustment stopper 16, thereby preventing the chamfering amount adjustment stopper 16 from being attached or detached. The tip of the chamfering amount adjustment stopper 16 is set back a predetermined amount from the tip of the chamfering cutting edge 12, so that the depth of the chamfering can be adjusted as appropriate. When changing the chamfer depth of the machined hole 14, it is only necessary to replace the chamfer amount adjustment stopper 16 having a different axial length.

On the other hand, a wide chip pocket 20 is formed between the chamfering cutting edge of the chamfering tool main body 10 and the chamfer amount adjustment stopper 16, and chips cut by the chamfering process can easily be stored in the chip pocket 20. It is designed to be ejected, guided, and contained.

Further, a guide rod 22 extending forward is integrally formed at the tip of the chamfering tool main body 10, and a pair of fixed side and movable side bearings 23 and 24, which are spaced apart in the axial direction, are attached to the guide rod 22. be done. The above bearings 23, 24
Bearing support 2 is mounted on the opposite cylindrical extension of
5 and 26 are mounted on the shaft. Bearing support 2
Reference numerals 5 and 26 are ring-shaped, and are provided with opposing spring receivers 25a and 26a having a groove structure in which a plate-shaped or rod-shaped guide spring 27 is supported. Both ends are supported. The guide springs 27 are spaced at 90 degree intervals in the circumferential direction, for example.
A plurality of guide springs 27 are arranged at 120 degree intervals, and the guide springs 27 are connected to double nuts 28 and 29.
The amount of deflection in the direction of expansion is adjusted by. The double nuts 28 and 29 engage with the movable bearing 24 to restrict movement of the movable bearing 24 along the axial direction of the guide rod 22. The double nut includes an adjustment nut 28 that adjusts the amount of expansion and deflection of the guide spring 27, and a locking nut 29 that fixes this adjustment nut 28.
8 and 29 are screwed onto the threaded end of the guide rod 22.

Next, a chamfering operation using a chamfering tool will be explained.

The tool body 10 of the chamfering tool is attached by inserting and fixing the Morse taper part 11 into the chuck part of a machine tool. By driving the machine tool, the chamfering tool body 1
Rotational torque is transmitted to the chamfering cutting edge, and chamfering is performed at the chamfering cutting edge.

During this chamfering process, the depth of the chamfer is determined by abutting the tip end face of the chamfer amount adjustment stopper 16 against the machined surface of the workpiece 13. To change the depth of the chamfer, press the chamfer amount adjustment stopper 1.
This is done by replacing the longitudinal dimension of 6 with a stopper of a predetermined dimension.

In addition, the chamfering tool is attached to the machined hole 14 of the workpiece 13.
In order to accurately guide the chamfering tool body 10, a plurality of guide springs 27 are attached to the tip of the chamfering tool body 10. The guide spring 27 is attached to the adjustment nut 2
By adjusting the amount of bulge deflection in step 8, the bulge size of each guide spring 27 can be easily adjusted to correspond to the hole diameter of the machined hole to be chamfered. Therefore, if the hole diameter of the machined hole 14 is large or small, adjust the amount of expansion of the guide spring 27 according to the hole diameter with the adjusting nut 28, and tighten the locking nut 2.
By fixing with 9, the chamfering tool body 10
is inserted easily and smoothly into the machined hole 14,
The center of the machined hole 14 and the center of the chamfering tool body 10 can be easily aligned.

Even if the guide spring 27 inserted into the machined hole 14 of the workpiece 13 strongly engages or gets caught in the machined hole 14, both ends of the guide spring 27 are held together by the bearings 23 and 24. Since it is supported by the guide rod 22, the rotation of the chamfering tool body 10 is not adversely affected, and the tool body 10 is rotated smoothly, allowing the chamfering work to proceed. At that time, guide spring 2
7 is frictionally engaged with the machined hole 14 and its rotation is regulated;
Moreover, the elasticity of the guide spring 27 can effectively prevent damage to the inner surface of the machined hole 14.

The chips removed by this chamfering work are
Since the chip is smoothly guided and accommodated in the chip pocket 20, it is easy to eject the chip.

[Effect of idea]

As described above, the chamfering tool according to the present invention is provided with a removable chamfer amount adjustment stopper that determines the chamfer depth of the chamfering tool body, so the chamfer depth dimension can be accurately determined by this adjustment stopper. This makes it possible to reliably prevent variations due to individual differences among workers, and improve chamfering accuracy.

In addition, a guide spring is supported by a guide rod extending forward from the chamfering tool body via a pair of fixed side and movable side bearings provided apart from each other in the axial direction, and the amount of expansion and deflection of the guide spring is controlled by a double nut. Since it is adjustable, by adjusting the amount of expansion of the guide spring using the double nut, it can be adapted to changes in the hole diameter of the machined hole, providing versatility. Furthermore, since the spring force of the guide spring is used to guide the chamfering tool body to the machined hole, the chamfering tool body can be guided to the machined hole smoothly and easily.

On the other hand, since the chamfering tool of the present invention is versatile, the tool manufacturing cost is low, and it is not only economical, but also can be used to accurately chamfer holes of various hole diameters. can,
The workability of chamfering can be improved.

[Brief explanation of drawings]

Fig. 1 is an overall view showing one embodiment of the chamfering tool according to the present invention, Fig. 2 is a plan cross-sectional view taken along the - line in Fig. 1, and Fig. 3 is a conventional chamfering tool which is a modified twist drill. FIG. 10... Chamfering tool body, 12... Chamfering cutting blade, 13... Workpiece, 14... Machining hole, 15...
...Mounting step, 16...Chamfer amount adjustment stopper, 1
7...Set screw, 20...Tip pocket, 22
... Guide rod, 23 ... Fixed side bearing,
24...Movable side bearing, 25, 26...Spring support, 27...Guide spring, 2
8...adjusting nut, 29...stopping nut.

Claims (1)

[Claims for Utility Model Registration] 1. A chamfering tool body equipped with a cutting edge is removably provided with a chamfering amount adjustment stopper that determines the chamfering depth, and a guide rod extending forward is integrally provided at the tip of the chamfering tool body. The guide rod is formed to support a guide spring via a pair of fixed and movable bearings installed axially apart, and is engaged with the movable bearing to extend along the axial direction of the guide rod. A chamfering tool characterized in that a double nut for regulating movement of the movable side bearing is screwed to the guide rod, and the amount of expansion and deflection of the guide spring can be adjusted by the double nut. 2. The chamfering tool according to claim 1, wherein the chamfering tool main body has a tip pocket for storing chips between the cutting edge portion and the chamfering amount adjustment stopper. 3. The guide spring is composed of a plurality of plate-shaped or rod-shaped springs, and both ends of the guide spring are supported by spring supports respectively attached to a pair of fixed side and movable side bearings. Chamfering tool as described in section. 4. The double nut consists of an adjustment nut that adjusts the amount of expansion and deflection of the guide spring, and a locking nut that fixes this adjustment nut, and both nuts are screwed onto the tip of the guide rod. Chamfering tool described in .