JPS6348323Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a finely adjustable boring tool, and in particular, it is designed to allow easy and reliable fine adjustment.

Conventionally, fine adjustment tools equipped with eccentric sleeves have been disclosed, for example, in Japanese Utility Model Application Publication No. 58-63913. What is seen in this publication is that a drilling tool is attached to the central axis of the spindle via an eccentric sleeve, and the position in the radial direction is adjusted by rotating the drilling tool. The anti-rotation mechanism and the clamp mechanism are made to function.

However, although the mounting mechanism of this drilling tool has advantages such as high mounting rigidity of the tool itself, it is a fine adjustment mechanism that uses tool rotation, so it cannot be preset outside the machine, and the fine adjustment mechanism cannot be operated by a spindle. Since the adjustment must be made at the time of installation, the operability is not necessarily satisfactory, and therefore there is a demand for the development of a further improved fine adjustment tool.

The present invention was developed in view of the above points, and is based on the premise of a fine adjustment tool that takes advantage of the advantages of an eccentric sleeve, and an improved fine adjustment tool that is incorporated into an adapter so that presetting can be performed outside the machine. It provides drilling tools.

Hereinafter, an embodiment of the finely adjustable boring tool of the present invention will be described with reference to the drawings.

1 and 2, reference numeral 1 denotes an adapter to be attached to a machine tool (not shown), and a tool shown in FIGS. 3 to 5 is inserted into a mounting hole 2 drilled in the longitudinal direction of the adapter. A main body 3 and an eccentric sleeve 4 are assembled.

The tool body 3 is composed of a cutting head 6 having a cutting tip 5, a shaft portion 7 fitted into the inner peripheral portion of the eccentric sleeve 4, and a flange 8 located at an intermediate portion.

Furthermore, the eccentric sleeve 4 has an eccentric relationship between its inner diameter and outer diameter as clearly shown in FIG. 6, and has a window on its outer peripheral side as shown in FIGS. Part 9 is open.

Between the shaft portion 7 of the tool body 3 and the eccentric sleeve 4, there is provided a mechanism 10 for preventing the tool body 3 from slipping off and loosening the eccentric sleeve 4.
is provided. This mechanism 10 includes, for example, the sixth
As shown in the figure, it consists of an approximately C-shaped elastic ring. And this elastic ring 10
On the shaft portion 7 side, its bent end is connected to the locking hole 11.
1, and the remaining annular portion is located within the outer circumferential groove 12. Further, on the eccentric sleeve 4 side, the elastic ring 10 is located in an inner circumferential groove 14 having a continuous slit 13, and the slit 13 facilitates attachment and detachment of the elastic ring 10 depending on its rotational position.

Further, when the tool main body 3 is installed in the mounting hole 2 of the adapter 1 via the eccentric sleeve 4, the end surface of the flange 8 comes into contact with the end surface of the adapter 1. A sliding mechanism 15 that guides the tool body 3 in the radial direction is provided between these end faces.
In the illustrated case, this sliding mechanism 15 is constructed by having a key 16 protrudingly provided on the adapter 1 side and an elongated keyway 17 that secures the amount of movement on the flange 8 side. . Note that this amount of movement is set based on the amount of eccentricity δ of the eccentric sleeve 4.

Therefore, the pivoting end 1 of the eccentric sleeve 4
The scale portion 19 on the 8 side is engraved over approximately half the circumference with the eccentricity δ as a reference. This is because there is a rotation limit of approximately half a circumference between the set screw 22 extending from the threaded hole 20 of the adapter 1 toward the pressing mounting surface 21 of the shaft portion 7 and the window 9 of the eccentric sleeve 4.

Then, according to this scale, the cutting blade tip 5
After the radial cutting edge position of the adapter 1 is finely adjusted, the setscrew 2 extending from the screw hole 20 of the adapter 1
2 screws the press mounting surface 21 of the tool body 3. In this case, the pressing mounting surface 21 is formed as an inclined surface, as clearly shown in FIG. 4, so that the tool body 3 can be drawn into the mounting hole 2.

In the finely adjustable boring tool of the present invention constructed in this way, the tool body 3 can be reliably attached to the eccentric sleeve 4. This is because the axial and radial backlash between the tool body 3 and the eccentric sleeve 4 is eliminated by providing the mechanism 10 for preventing the tool body 3 from falling off and loosening, which enables elastic support. There is. Since an appropriate biasing force is applied by the locking mechanism 10, there is no need to loosen or tighten the eccentric sleeve 4 and the shaft portion 7 of the tool body 3 each time the tool is preset outside the machine, making adjustment easy. can be done.

Further, the finely adjustable boring tool of the present invention allows fine adjustment operations to be easily performed even on the machine. This is because the rotating end of the eccentric sleeve 4 is located on the rear end side of the adapter 1, and there is no obstacle to the rotating operation.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an embodiment of the finely adjustable boring tool of the present invention, Fig. 2 is a side view thereof, and Fig. 3
The figures are a plan view of the assembled tool body and eccentric sleeve, Figure 4 is a front view, Figure 5 is a side view, and Figure 6 is an enlarged sectional view taken along the - line in Figure 4. . 1...Adapter, 2...Mounting hole, 3...Tool body, 4...Eccentric sleeve, 5...Cutting tip,
6... Cutting head, 7... Shaft portion, 8... Flange, 9... Window portion, 10... Retaining and loosening mechanism, 15... Sliding mechanism, 19... Scale portion, 22... Set screw.

Claims (1)

[Claims for Utility Model Registration] A tool body 3 equipped with a cutting head 6 is fitted into a mounting hole 2 through which a block-shaped adapter 1 passes through a rotatable eccentric sleeve 4, and In this finely adjustable boring tool, the tool body 3 is guided in the radial direction by a sliding mechanism 15 and fixed by a set screw 22 provided on the adapter 1. The cutting head 6 is followed by a flange 8 and a shaft portion 7, and for the adapter 1, the shaft portion 7 is fitted into the mounting hole 2 via the eccentric sleeve 4. The flange 8 is in contact with the open end surface of the mounting hole 2, and there is a space between the shaft portion 7 and the eccentric sleeve 4.
The eccentric sleeve 4 is provided with a retaining and loosening mechanism 10 made of an elastic ring, and the eccentric sleeve 4 has a window 9 opened on its outer circumferential surface, and is also provided with a window 9 for the cutting head 6 of the tool body 3. On the opposite side and at the end projecting from the mounting hole 2 of the adapter 1, a scale portion 19 based on the amount of eccentricity is formed, and the sliding mechanism 15 has a key 16 and a key Groove 1
7, and is arranged between the flange 8 of the tool body 3 and the end face of the adapter 1 in contact with the flange 8 so that the tool body 3 can be guided in the radial direction, and the set screw 22 is provided on the adapter 1. A finely adjustable boring tool characterized in that it is screwed into a screw hole 20, the tip of which passes through a window 9 of an eccentric sleeve 4, and presses and fixes a shaft portion 7 of a tool body 3.