JPS6331846Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cutting tool that allows fine adjustment of the position of the cutting edge.

An eccentric cylinder whose outer circumferential surface and inner circumferential surface are slightly eccentric is inserted between the circular through hole of the tool body and the cylindrical part of the cutter holder, and by rotating this eccentric cylinder, the cutter holder is A cutting tool for finely adjusting the position of the cutting edge of a cutting tool fixed in the radial direction of the cylindrical part is, for example, the one shown in Fig. 1, which was developed in the 1970s.
-Already known from No. 51356.

However, in conventional cutting tools of this type, a flange with a rotary tool engaging part is formed at the front end of the eccentric cylinder, so when adjusting the cutting edge position using a setting gauge, The rotary tool and setting gauge tended to interfere, resulting in poor workability. This can be easily understood by imagining, for example, attaching a setting gauge to plane A in FIG. 1 and adjusting the position of the cutting edge 12 of the cutting tool 10.

Additionally, scales and base lines for visually checking the amount of rotation of the eccentric cylinder are usually attached to the eccentric cylinder and the tool body, but since the surface with the scales and base lines is close to the cutting tool, Another drawback was that cutting oil and chips were likely to adhere to the scale, and the area around the scale had to be cleaned every time the amount of rotation was visually checked.

Furthermore, since the rotation prevention means of the cutting tool holding member is provided on the rear end side of the cutting tool holding member, the mounting rigidity of the cutting tool is low, and chatter tends to occur easily.

The purpose of this invention is to avoid interference between the rotary tool and the setting gauge when adjusting the position of the cutting edge using the setting gauge, to improve workability, and to make it possible to cut around the scale and base line. To provide a cutting tool with a blade edge position fine adjustment device, which is less likely to have oil or chips attached thereto and has high mounting rigidity.

In order to achieve this purpose, the cutting tool according to the present invention is: (1) a tool that is equipped with a circular through hole that penetrates from the front end surface to the rear end surface and that is installed in a non-rotating tool mounting part of a machine tool; (2) a flange having a rotary tool engaging portion is formed at the rear end of a cylindrical portion whose outer circumferential surface and inner circumferential surface are eccentric; the flange is in close contact with the rear end surface of the tool body; (3) an eccentric cylinder that is slidably fitted into the through hole with the front end of the cylindrical portion retracted from the front end surface of the tool body; (3) an eccentric cylinder provided on one of the flange and the tool body; a scale and a base line provided on the other side; (4) a flange having a diameter larger than the through hole at the front end of the cylindrical part; a cutting tool holding part in front of the flange; (5) a cutter holding member fitted in a state in which the cutter holding member is slidable and its rear end protrudes rearward; (5) a cutter holding member disposed between the rearward protruding rear end of the cutter holding member and the eccentric cylinder; (6) a spring member provided on the front end surface of the tool body or a flange of the cutter holding member; an engagement protrusion protruding from one of the two sides to engage with an engagement recess formed on the other side to prevent rotation of the cutting tool holder with respect to the tool body; When rotated by a rotary tool engaged with the engaging portion, the position of the cutting edge of the cutting tool held by the cutting tool holding portion is adjusted in the radial direction of the cylindrical portion.

In addition, here, the non-rotating tool mounting part means
A tool mounting part that cannot be rotated during cutting, such as a tool post on a lathe, is a non-rotating type if it is rotated to bring one of multiple cutting tools to the position of use. This is the tool mounting part.

Further, the flange of the cutting tool holding member is not only a normal flange that is entirely formed integrally with the cutting tool holding member, but also a flange that is formed integrally with the cylindrical part,
a fixing flange portion including the engaging recess or the engaging protrusion and having a male thread formed on the outer circumferential surface; and a nut part that separates the rear end face of the flange part from the front end face of the tool body, and by rotating the nut part, the position of the cutting edge of the cutting tool is also adjusted in the axial direction of the cylindrical part. This also includes those configured as follows.

Embodiments of the present invention will be described in detail below with reference to the drawings.

In FIGS. 2 and 3, the tool body 16 has a block shape and is provided with a circular through hole that penetrates from the front end surface to the rear end surface of the tool body 16. It is attached to the machine tool in close contact with the rotary tool mount.

The through hole of the tool body 16 has an outer circumferential surface and an inner circumferential surface eccentric by a predetermined amount, and a rear end portion of the outer circumference has a
Flange portion 18 having a hexagonal spanner hook portion 17
An eccentric cylinder 20 having a formed therein is slidably fitted therein. Furthermore, scale lines are engraved at predetermined intervals on the outer peripheral surface of the flange portion 18. The eccentric cylinder 20 is fitted with the flange portion 18 in close contact with the rear end surface 22 of the tool body 16 and with the front end 23 of the eccentric cylinder 20 slightly retracted from the front end surface 24 of the tool holder 16. In addition, the flange portion 18
A base line is engraved on the rear end surface 22 near the outer periphery, which indicates the cutting edge position adjustment amount as the eccentric cylinder 20 rotates in conjunction with the scale line.

A cutter holding member 28 having a cutter holding portion 26 at one end is slidably fitted into the cylindrical portion 30 from the front side inside the eccentric cylinder 20.
and a rod-shaped portion 32 formed at the rear end of the cylindrical portion 30
is projected toward the rear of the eccentric cylinder 20. A tip 33 as an example of a cutter is attached to the tip of the cutter holder 26.
A fixed flange portion 34 is provided between the columnar portion 30 and the cylindrical portion 6.
A flange is formed with a nut 35 and a nut 35. The fixed flange portion 34 is formed integrally with the columnar portion 30 and has an engagement groove 38 that engages with a pin 36 erected on the front end surface 24 of the tool body 16 to prevent rotation of the cutting tool holding member 28 with respect to the tool body 16. In addition, a male thread 40 is formed on the outer peripheral surface. A nut 35 is screwed into this male screw 40, and the rear end surface of the nut 35 abuts the front end surface 24 of the tool body 16, and the rear end surface of the fixed flange portion 34 is spaced apart from the front end surface 24.

On the other hand, between the rod-shaped portion 32 of the cutting tool holding member 28 and the eccentric cylinder 20, a thrust bearing 42
A plurality of disc springs 46 are attached via spacers 44 and nuts 45, and urge the eccentric cylinder 20 forward and the cutter holding member 28 backward, respectively.

Since the cutting tool of this embodiment is constructed as described above, by applying a spanner to the spanner hook part 17 at the rear end of the eccentric cylinder 20 and rotating the eccentric cylinder 20, the leading edge position of the tip 33 can be adjusted. can be adjusted in the radial direction, that is, in the radial direction of the cylindrical portion 30. That is, when the eccentric cylinder 20 is rotated, the inner circumferential surface, which is eccentric with respect to the outer circumferential surface, is aligned with the center line of the outer circumferential surface, that is, the tool body 16.
It rotates while revolving around the center line of the through hole. However, since the cutter holding member 28 fitted into the eccentric cylinder 20 is prevented from rotating by the engagement between the pin 36 and the engagement groove 38, it does not rotate together with the eccentric cylinder 20, and the cylindrical portion Only the center line of the tool body 16 rotates around the center line of the through hole of the tool body 16 together with the center line of the inner peripheral surface of the eccentric cylinder 20.
As a result, the cutting edge 50 of the tip 33 fixed to the cutting tool holding member 28 is moved by an amount corresponding to the radial component of the rotational movement of the center line of the cylindrical part 30, and the cutting edge 50 of the tip 33 fixed to the cutting tool holding member 28 is moved by an amount corresponding to the radial direction component of the rotational movement of the center line of the cylindrical part 30, and the cutting edge 50 of the tip 33 is fixed to the cutting tool holding member 28. is adjusted.

Further, by rotating the nut 35, the position of the cutting edge 50 of the tip 33 is adjusted in the axial direction of the cylindrical portion 30 by the elastic force of the disc spring 46.

As described above, the cutting tool of this embodiment allows fine adjustment of the position of the cutting edge 50 with ease, and also has the following effects.

(1) Good workability when adjusting the position of the cutting edge.

That is, in the conventional example shown in FIG. 1, when the eccentric sleeve 60 is rotated with a wrench when adjusting the position of the cutting edge 12, the nut 64 is rotated so that the nut 64 does not rotate together with the eccentric sleeve 60.
Although it is necessary to apply a wrench to the eccentric cylinder 2 to prevent its rotation, in this embodiment, the eccentric cylinder 2
Since the wrench hook 17 and the nut 35 are arranged separately at the front and rear of the tool body 16, the wrench is applied only to the wrench hook 17 to tighten the eccentric cylinder 20.
All you have to do is rotate it. Therefore, adjusting the position of the blade edge 50 is easy.

(2) Good workability when using a cutting tool setting gauge.

That is, the radial position of the cutting edge 50 can be adjusted by aligning a predetermined scale on the outer periphery of the flange portion 18 with the base line of the tool body 16. For example, in FIG. If a setting gauge is attached and used with the plane as a reference, the blade edge position can be adjusted easily and accurately. In this case, since the spanner hook 17 for rotating the eccentric cylinder 20 is located apart from the setting gauge, the spanner and the setting gauge do not interfere with each other, making their use easier. Furthermore, even when adjusting the position of the cutting edge 50 in the axial direction of the cylindrical part 30, only one wrench is needed to rotate the nut 35, so there is less interference with the setting gauge compared to the conventional example. This makes the work easier.

(3) Ease of visual inspection of the scale is less likely to be impaired.

That is, since the flange portion 18 is provided on the opposite side of the chip 33, chips, cutting oil, etc. are less likely to adhere to the scale lines of the flange portion 18, and
Situations in which chips, etc. must be removed during visual inspection are significantly reduced.

In addition, in order to improve the ease of visual inspection and the workability when using the setting gauge, the nut 35
Although it would be desirable to eliminate the fixed flange portion 34 and provide a corresponding portion on the flange portion 18 side, this would complicate the structure and make it difficult to adjust the position of the cutting edge. Therefore, in this embodiment, the nut 35 is left on the front side of the tool body 16 in order to avoid this and obtain the following effects.

(4) The mounting rigidity of the cutting tool is improved.

That is, the main force of the cutting resistance acting on the chip 33 is received by the pin 36 engaged with the engagement groove 38 of the fixed flange 34, and the feeding force is received by the fixed flange portion 34.
The front end surface of the tool body 16 receives the force through the nut 48 screwed into the tool body 66. Whereas in the conventional embodiment, the main force is received near the rear end surface of the tool body 66, in this embodiment , the chip 33 and the principal force,
The distance to the part that receives the feeding force is small. Therefore, the mounting rigidity of the cutting tool 33 is improved, chatter, etc. of the cutting edge 50 is suppressed, and cutting accuracy is improved.

The cutting tool shown in FIGS. 4 and 5 shows another embodiment of the present invention, and the same parts as those in the embodiment shown in FIGS. 2 and 3 are designated by the same numbers. Explanation will be omitted.

The tool body 76 has an inverted trapezoidal protrusion 78 on one side thereof.
The tool body 16 is the same as the tool body 16 except that it is provided with.
The cutter holding member 80 has a structure in which the rod-shaped portion 32 in the cutter holding member 26 is eliminated, and a female thread is cut into the rear end of a portion corresponding to the cylindrical portion 30, into which a bolt 82 is screwed. The other parts are the same as the cutting tool holding member 26. However, the shapes of the cutting tool holding portion 84 and the tip 86 are slightly different. The nut 88 has a flange portion, and the bolt 88 has a flange portion.
The flange portion is held down by a holding plate 90 attached at 9 to prevent the nut 88 from rotating freely. Other than this, the structure and function are the same as the nut 35 described above.

According to the cutting tool of this embodiment, since the nut 88 is fixed to the tool body 76 after adjusting the position of the cutting edge of the tip 86, the mounting rigidity of the cutting tool 86 is further increased, and stable cutting is possible. Other effects are the same as in the previous embodiment.

6 and 7 show other embodiments of the present invention, which differ from those shown in FIGS. 2 and 3 in that they do not have the nut 35 and the shape of the cutting tool holding member 91 is slightly different. This is different from the example. That is, the blade holding member 91 has a portion corresponding to the rod-shaped portion 32 of the blade holding member 28 that is thick and short, and a bolt 92 is screwed into the rear end thereof.
A thrust bearing 42 and a disc spring 46 are attached to a portion corresponding to the rod-shaped portion 32, and a spacer 44
A compressive force is applied to the disc spring 46 by the bolt 92 via the bolt 92.

Therefore, it has the same effect as the cutting tool of the embodiment shown in FIGS. 2 and 3. However, Natsuto 3
5, the position of the cutting edge 50 of the tip 33 cannot be adjusted in the axial direction of the cutting tool holding member 91.

8 and 9 show other embodiments of the present invention, and the embodiment shown in FIGS. 6 and 7 is different from the embodiment shown in FIGS. Similar to the example. That is, the cutting tool holding member 94 is divided into two parts, a shaft portion 96 and a cutting tool mounting portion 98, and the mounting structure of the disc spring 46 is approximately the same as that of the cutting tool shown in FIGS. 2 and 3. has been done.

Therefore, it has the same effect as the embodiment shown in FIGS. 6 and 7. Furthermore, since the cutter attachment part 98 is removable, it is possible to improve efficiency during setup change by setting the cutter attachment member 98 having various cutting edge positions in advance.

Although several embodiments of the present invention have been described above, the present invention is not limited to these embodiments in any way, and may be implemented with various improvements and changes within the scope of the gist of the present invention. It is possible.

As described in detail above, in the present invention, the eccentric cylindrical rotary tool engaging portion attached flange is disposed at the rear of the tool body, so when adjusting the cutting edge position using the setting gauge, the rotary tool is not set. There is no interference with the gauge, and the workability is improved. Furthermore, since the scale lines and base lines can be provided at a position away from the cutting tool, it is possible to reduce the possibility that ease of visual inspection is impaired due to adhesion of chips, cutting oil, etc. around the scale lines and base lines. Furthermore, since the rotation prevention means and the flange for transmitting cutting resistance to the tool body are provided close to the cutting tool, the mounting rigidity of the cutting tool is improved, and cutting accuracy is improved.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view showing an example of a conventional cutting tool. FIG. 2 is a front sectional view showing an embodiment of the present invention, and FIG. 3 is a left side view thereof. FIG. 4 is a front sectional view showing another embodiment of the present invention, and FIG. 5 is a left side view thereof. FIG. 6 is a front sectional view showing another embodiment of the present invention,
FIG. 7 is a left side view thereof. FIG. 8 is a front sectional view of another embodiment of the present invention, and FIG. 9 is a left side view thereof. 16, 66, 76... Tool body, 17... Spanner hook part (rotary tool engaging part), 18... Flange part, 20... Eccentric cylinder, 23... Front end of eccentric cylinder, 28, 80, 91, 94... cutter holding member,
33, 86... Chip (cutting tool), 34... Fixed flange portion, 36... Pin (engaging protrusion), 38...
Engagement groove (engagement recess), 40... Male thread, 46...
Disc spring, 35, 88...Natsuto.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A tool body that is equipped with a circular through hole penetrating from the front end face to the rear end face and that is attached to a non-rotating tool attachment part of a machine tool, and an outer circumferential surface and an inner circumferential surface. A flange with a rotary tool engaging part is formed at the rear end of the cylindrical part that is eccentric, and the flange is in close contact with the rear end surface of the tool body, and the front end of the cylindrical part is in contact with the front end surface of the tool body. an eccentric cylinder slidably fitted into the through hole in a more retracted state; a scale provided on one of the flange and the tool body; and a base line provided on the other; and a front end of the cylindrical portion. A flange having a diameter larger than that of the through hole is provided, a cutting tool holding portion is provided in front of the flange, the cylindrical portion is slidable from the front side within the eccentric cylinder, and the rear end portion protrudes rearward. The fitted cutter holding member is disposed between the rearwardly protruding rear end of the cutter holding member and the eccentric cylinder, the cutter holding member is placed toward the front end surface of the tool body, and the eccentric cylinder is moved toward the front end surface of the tool body. a spring member that urges the rear end face of the tool body; and a spring member that protrudes from either the front end face of the tool body or the flange of the cutter holding member and engages with an engagement recess formed in the other to hold the cutter. an engaging protrusion that prevents rotation of the holding body relative to the tool body, and when the eccentric cylinder is rotated by a rotating tool engaged with the rotating tool engaging portion of the flange, the cutting tool holding portion A cutting tool, characterized in that the position of the cutting edge of the cutting tool held in the cylindrical portion is adjusted in the radial direction of the cylindrical portion. (2) The flange of the cutting tool holding member is formed integrally with the cylindrical part, includes the engaging recess or the engaging protrusion, and has a fixed flange part having a male thread formed on the outer peripheral surface; a nut portion which is screwed together and whose rear end surface abuts the front end surface of the tool body to separate the rear end surface of the fixed flange portion from the front end surface of the tool body;
The cutting tool according to claim 1, which is configured to adjust the position of the cutting edge of the cutting tool also in the axial direction of the cylindrical part by rotating the nut part.