JP3186341B2 - Indexable face milling - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a throw-away type face mill having a plurality of throw-away tips (hereinafter simply referred to as "tips") mounted on a tool body.

[0002]

2. Description of the Related Art In a throw-away type face milling machine of this type, a chip made of a hard material such as a cemented carbide is attached to and detached from a number of chip pockets and chip mounting seats formed on the outer periphery of the tip of a disk-shaped tool body. It is freely attached,
By feeding the tool body while rotating it around its axis, the workpiece is cut by the cutting blades arranged on the outer peripheral side and the tip side of the tool.

[0003] As means for fixing the chip to the tool main body, one of the means is, for example, as shown in FIGS. (In the direction of arrow T in FIG. 2), the chip 4 is mounted on the chip mounting seat 3 formed on the rear side by bringing one side surface 4 a into contact with the inner wall surface 3 a, and the wedge member 5 is inserted further behind the chip 4. To press the chip 4 in the rotation direction,
There is known a means for narrowly mounting the chip 4 between the mounting surface 3b of the chip mounting seat 3 and fixing the chip. As another means, for example, as shown in FIGS. 13 (a) to 13 (c), a chip 4 mounted on the chip mounting seat 3 via the sheet 6 is inserted into a wedge member inserted forward in the rotation direction. Means 5 is also used to press and fix to the rear in the rotation direction.

[0004]

By the way, in a face mill having such a large number of chips 4, each chip 4
If the tips 4 are not mounted so that the cutting trajectories 4b and 4c of the cutting blades 4b and 4c draw about the axis O of the tool body 1 coincide with each other, that is, if the cutting edges 4b and 4c do not have high runout accuracy, There is no hope of quality processing. If the run-out accuracy in the direction of the axis O of the cutting blade 4b disposed on the tip end side of the tool main body 1 is not high, that is, the front-runout accuracy of the cutting blade is not high, the machined surface roughness of the work material deteriorates. As a result, the quality of processing is significantly reduced.

However, in order to match the front runout accuracy of the cutting blade, it is limited to obtain a runout accuracy of about 5 μm, even if a runout device such as a setting fixture is used. In order to obtain a higher run-out accuracy of the cutting edge by fine adjustment of the cutting edge, it is necessary to rely on the skill and experience of the operator. Furthermore, as the number of chips 4 mounted on the front milling machine increases, it becomes more difficult to give high precision of all the cutting edges 4b, and the tendency to rely on the skill of the operator is further increased. On the other hand, by interposing a supporter or the like between the inner wall surface on the tool base end side of the chip mounting seat and the chip, and replacing the supporter with one having various dimensions, fine adjustment of the position of the chip can be performed. A possible throwaway type face milling machine has been proposed, but even such a type has a 5μ
The limit was to obtain a runout accuracy of about m.

In view of such circumstances, the present invention allows a fine adjustment of the tip position without requiring a high level of skill and experience from the operator, and provides a throw-away type in which a high front-running accuracy of the cutting blade can be obtained. It is intended to provide a face milling machine.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems and to achieve such an object, the present invention provides a method for manufacturing a tool, comprising: A flexible portion that bends to the outer peripheral side is provided, and a positioning portion is provided on the inner peripheral side of the flexible portion, the outer peripheral end of which is in contact with the flexible portion to adjust the amount of bending of the flexible portion, Further, a tip mounting seat is formed at the distal end of the flexible portion to detachably mount the chip, and the mounting position of the chip can be moved in the axial direction according to the amount of bending of the flexible portion by the positioning portion. It is characterized by having.

[0008]

According to the throw-away type face milling machine having such a configuration, the flexible portion provided on the outer periphery of the tool main body is bent toward the outer peripheral side in the radial direction of the tool main body, so that the position of the distal end of the flexible portion is adjusted. Moves slightly back and forth in the axial direction. Here, the amount of deflection of the flexible portion is adjusted by the contact position of the outer peripheral end of the positioning portion that contacts the flexible portion from the inner peripheral side. Is finely adjusted according to the contact position of the positioning portion. Since the tip is attached to the distal end of the flexible portion, the contact position of the positioning portion with the flexible portion is appropriately set to easily and accurately finely adjust the attachment position of each chip. This makes it possible to obtain high front-runout accuracy of the cutting blade.

[0009]

1 to 4 show a first embodiment of the present invention. In these figures, the tool body 11 is formed of a steel material or the like and has a substantially disc shape, and has a central portion along the axis O of the disc for attaching the tool body 11 to a spindle end or the like of a machine tool. A hole 11a is formed. Further, the tip side of the tool body 11 (FIGS. 1 and 2)
In the outer peripheral portion of the tool body 11, a number of chip pockets 1 are opened so as to open on the outer peripheral surface and the distal end surface of the tool body 11.
Are formed behind the tip pockets 12 from the distal end of the tool body 11 along the axis O in the tool rotation direction (direction of the arrow T in the drawing). A recess 13 is formed toward. The recess 13 has a cartridge 14 made of a flexible material, such as spring steel, having relatively high elasticity and toughness.
Are detachably attached by clamp screws 15 and constitute a flexible portion in the present embodiment.

The recess 13 is formed such that the bottom surface 13a of the recess 13 is directed toward the tip of the tool body 11 in the direction of the axis O.
Is formed on an inclined surface toward the radially outer peripheral side, and a concave portion 13b is formed on the base end side so as to be further depressed one step from the bottom surface 13a. On the other hand, the cartridge 14 is a hook-shaped member having a base end 14a that fits into the recess 13b. The cartridge 14 is fitted into the recess 13 and inserted through the base end 14a. The clamp screw 15 is fixed to the tool body 11 by screwing the same to the tool body 11. Further, with the clamp screw 15 screwed, the tool body 1 of the cartridge 14 is
1 The surface 14b facing the inner peripheral side is the bottom surface 13a of the recess 13.
It is set to adhere to Further, the distal end portion 14c of the cartridge 14 is formed so as to slightly expand toward the radially outer peripheral side of the tool main body 11, and the distal end portion 1c is formed.
A chip mounting seat 16 is formed on a surface facing the outer peripheral side of 4 c so as to face the chip pocket 12. And
A tip 17 made of a hard material such as a cemented carbide is detachably attached to the tip mounting seat 16 by a clamp screw 18.

In the present embodiment, the tip 17 has a parallelogram flat plate shape, and one surface of the parallelogram is directed to the outer peripheral side of the tool body 11 as an outer peripheral flank. One of a pair of peripheral surfaces intersecting the acute angle end of the parallelogram is directed to the tool rotation direction side as a rake surface, and the other of the pair of peripheral surfaces is a tip flank surface as a tool body. The tip 11 is attached to the tip attachment seat 16. A main cutting edge 17a arranged on the outer peripheral side of the tool body 11 is formed at a ridge portion where the outer peripheral flank and the rake face intersect, and a ridge line at which the rake surface and the tip flank intersect is formed. Is formed with a sub cutting edge 17b arranged on the tip side of the tool body 11.

On the other hand, a recess 19 extending in the radial direction of the tool body 11 is formed on the tip surface of the tool body 11 so as to be continuous with the opening of the recess 13 on the tip side of the tool body 11. A flat positioning member 20 made of a material having the same flexibility as that of the cartridge 14 is fitted on the positioning member 19.
And is a positioning section in the present embodiment. Here, the bottom surface 19a of the concave portion 19 is formed in a stepped shape in which the outer peripheral portion is recessed one step closer to the base end side of the tool body 11 than the inner peripheral portion. On the outer peripheral side, the bottom surface 19a and the positioning member 20
Is formed between them. One of the clamp screws 21 and 22 is inserted into the inner peripheral side of the positioning member 20, and is used to fix the positioning member 20 to the tool body 11. Is the positioning member 2
0, which is screwed into the tool body 11 and screwed into the tool body 11 so that the positioning member 20 moves toward the gap 23 at the base end in the direction of the axis O. So that it can be flexed. Further, the end face 20 on the outer peripheral side of the positioning member 20
a is formed so that when the clamp screw 22 is loosened so that the positioning member 20 does not bend, the distal end portion of the surface 14b facing the inner peripheral side of the cartridge 14 comes into close contact with the cartridge 14.

In the throwaway type face milling machine having such a configuration, the position of the tip 17 in the direction of the axis O is finely adjusted, and the sub-cutting blade 17b arranged on the tip end side of the tool body 11 is formed.
To adjust the front deflection accuracy of the
Should be screwed into the tool body 11 side. As the clamp screw 22 is screwed in this way, this clamp screw 2
As described above, the positioning member 20 bends toward the gap 23 in accordance with the screw pitch of 2, and accordingly, the position of the outer peripheral end 20a of the positioning member 20 also moves toward the base end in the direction of the axis O. Here, the surface 14b facing the inner peripheral side of the cartridge 14 contacts the outer peripheral end 20a of the positioning member 20, and the inclined bottom surface 13a of the recess 13 as described above.
Because it is arranged in the inclined direction so that it closely adheres to
As the position of the outer peripheral end 20a moves to the base end side in the direction of the axis O, the outer peripheral end 20a is pressed by the outer peripheral end 20a and, as shown in FIG. It will be deflected outward. As a result, the position of the sub cutting edge 17b of the tip 17 in the direction of the axis O is also
Is adjusted by being retracted to the base end side by the retreat amount δ from the position of the place indicated by the reference sign A to the position indicated by the reference sign B, by adjusting the position of each chip 17 in the direction of the axis O in this manner. Thus, the front runout accuracy of the cutting blade of the indexable type face milling machine can be adjusted.

As described above, according to the throw-away type face milling cutter having the above-described configuration, the screw shaft 22 of the tip 17 can be simply inserted by simply screwing the clamp screw 22 inserted through the positioning member 20.
Since the position in the direction can be adjusted, it is possible to easily adjust the front deflection accuracy of the cutting blade. The amount of retraction of the tip 17 with respect to the amount of screwing of the clamp screw 22, that is, the amount of adjustment of the position of the sub-cutting blade 17b is determined by the screw pitch of the clamp screw 22 and the cartridge 1
4 and the bending of the positioning member 20. By appropriately setting these, the sub cutting edge 17b
Can be adjusted at a very fine pitch,
According to the throwaway type face milling machine having the above-described configuration, fine adjustment of the runout accuracy can be performed without requiring much skill and experience. And, by these, each chip 1
The deviation of the run-out of the sub-cutting blades 17b between the seven cutting edges can be made as close as possible to zero, and extremely high front-end run-out accuracy can be obtained. Can be formed.

In the face milling machine of this embodiment, the accuracy of the front runout of the cutting blade after each member is attached to the tool body 11 is adjusted by using the clamp screw 22 inserted and screwed from the tip side of the tool body 11. It can be done only by screwing. Therefore, when adjusting the run-out accuracy, for example, the adjustment can be performed only by placing the tool body 11 with the base end side of the tool body 11 facing downward and operating each clamp screw 22 from above. Also, there is an advantage that the adjustment operation can be performed more easily.

In this embodiment, as described above, the surface 14a facing the inner periphery of the cartridge 14 as a flexible portion is disposed in a direction inclined toward the outer periphery as it approaches the tip end of the tool body 11. Then, by bending the positioning member 20 as a positioning portion where the outer peripheral end 20a abuts on the surface 14a, the position of the sub cutting edge 17b is retracted from A to B as shown in FIG. The accuracy of the front deflection is adjusted.
As the inclination of a becomes smaller, the receding amount δ becomes smaller as shown in FIG. Further, when the inclination of the surface 14a of the cartridge 14 is such that the inclination toward the inner peripheral side of the tool main body 11 is closer to the distal end side of the tool main body 11, the outer peripheral end 20a of the positioning member 20 causes the aforementioned surface to be inclined. When the cartridge 14 is deflected by pressing the outer peripheral side 14a to the outer peripheral side, the sub cutting edge 17b retreats from the initial position A to the position B by a negative retreat amount δ as shown in FIG. 11 is advanced to the tip side in the axis O direction.

FIGS. 6 to 8 show a second embodiment of the present invention, in which the same reference numerals are assigned to parts common to the first embodiment, and description thereof will be omitted. The indexable type face milling machine of the second embodiment is different from the first embodiment in that the positioning member of the first embodiment has flexibility.
By flexing the positioning member 20, the cartridge 14 as a flexible portion is also flexed to adjust the position of the chip 17, whereas the positioning portion has a cartridge 14 as a flexible portion. A positioning piece 31 provided on the inner peripheral side of the cartridge 14, and the positioning piece 31 has its outer peripheral end 31 a facing the inner peripheral side of the cartridge 14.
, Can be advanced and retracted in the direction of the axis O while being kept in contact with the main body.

That is, in the second embodiment, the tool body 11
A concave portion 32 is formed on the inner peripheral side of each of the concave portions 13 on the distal end surface of the concave portion 13 so as to be continuous with the opening portion on the distal end side of the concave portion 13. In the concave portion 32, the flat positioning piece 31 is formed. It is configured to be inserted and attached to the tool body 11 by the clamp screw 33. Here, a disc spring 34 is interposed between the positioning piece 31 and the bottom surface 32a of the recess 32, whereby the positioning piece 31 is
The clamp screw 33 is screwed into the tool body 11 or loosened so that the position of the positioning piece 31 in the direction of the axis O moves backward or forward. Has become. Also,
The outer peripheral end 31a of the positioning piece 31 is the same as the outer peripheral end 20a of the positioning member 20 of the first embodiment.
A surface 14 facing the inner peripheral side of the cartridge 14 disposed so as to face the outer peripheral side as it goes toward the front end side in the direction of the axis O
b.

In the throw-away type face milling machine having such a configuration, the positioning piece 31 is retracted by screwing the clamp screw 33, and accordingly, the position of the outer peripheral end 31a is also retracted, so that the surface 1
4b, whereby the cartridge 14 bends radially outward of the tool body 11 to retreat the position of the tip 17 in the direction of the axis O. Accordingly, by appropriately setting the screw pitch of the clamp screw 33 and the bending of the cartridge 14 with respect to the retreat amount of the positioning piece 31, the position of the sub-cutting blade 17b of the tip 17 can be finely adjusted. In the embodiment, similarly to the first embodiment, it is possible to easily obtain high front-runout accuracy without requiring skill and experience.

9 to 11 show a third embodiment of the present invention.
This shows an embodiment, in which the same reference numerals are assigned to parts common to the first and second embodiments. In the third embodiment, the positioning member 20 of the first embodiment is formed separately for each cartridge 14 and attached to the tool body 11, and the recess 19 in which the positioning member 20 is attached is also provided in each cartridge 14. On the other hand, an annular concave groove 41 is formed on the distal end surface of the tool main body 11 so as to be continuous with the opening on the distal end side of each of the recesses 19. Of the positioning member 42 is fitted.

Here, the concave groove 41 is formed so that the inner peripheral side is one step deeper than the outer peripheral side, while the positioning member 42 is formed so that the inner peripheral side is one step thicker than the outer peripheral side. The positioning member 42 has its inner peripheral portion fitted into the inner peripheral portion of the concave groove 41 and is fixed to the tool body 11 by clamp screws 43. Further, the bottom surface 41 a of the outer peripheral side of the concave groove 41 and the positioning member 4
2 between the outer peripheral portion of the positioning member 42 and the outer peripheral portion of the positioning member 42 that allows the outer peripheral portion of the positioning member 42 to bend toward the base end in the direction of the axis O.
Are formed. Further, a plurality of slits 44 extending radially inward of the tool body 11 are formed in the outer peripheral portion of the positioning member 42 in the circumferential direction. Then, of the outer peripheral portions defined by the slits 44 adjacent to each other, the outer peripheral end 45a of the plate portion 45 located on the inner peripheral side of the cartridge 14 contacts the surface 14b facing the inner peripheral side of the cartridge 14. A clamp screw 46 is inserted through the plate-shaped portion 45 so that the tool body 11
Is screwed on. That is, the plate-like portion 45 is a positioning portion in the present embodiment that adjusts the amount of bending of the cartridge 14 as a flexible portion.

In the throw-away type face milling machine having such a structure, the plate-like portion 45 is bent toward the base end in the direction of the axis O by screwing the clamp screw 46, and accordingly, the cartridge 14 is moved to the radially outer side. Since the tip 17 is bent and the position of the tip 17 in the direction of the axis O is retracted, the same effects as those of the first and second embodiments can be obtained. Further, in the first and second embodiments, the recesses 19 and 32 are formed in the tip end surface of the tool body 11 or the positioning member 20 and the positioning piece 31 are mounted for each cartridge 14. On the other hand, in the third embodiment, one annular positioning member 42 may be mounted on one annular concave groove 41 formed in the tool body 11, and the tool body 11 and the positioning member 42 can be easily formed. The advantage is also obtained. Of course, the configuration may be such that the positioning member 42 can be divided into several parts. In each of the first to third embodiments, a separate member (the cartridge 14, the positioning members 20, 42, and the positioning piece 31) is mounted on the tool body 11, and a flexible portion and a positioning portion are mounted on the separate member. The tool body 1 is formed in some cases.
The flexible part and the positioning part may be directly formed on the first part.

[0023]

As described above, according to the present invention, even if the number of chips is large, skill and experience are not required, and even if the number of chips is large, the position of the chips in the axial direction can be obtained by bending the flexible portion. Can be easily fine-tuned, and the error in the run-out of the cutting edge between the inserts is kept very small.
It is possible to obtain high front-runout accuracy. As a result, it is possible to form a very high-quality processed surface having a good finished surface roughness.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention.

FIG. 2 is a side view of the first embodiment shown in FIG.

FIG. 3 is a view from the front end side of the first embodiment shown in FIG. 1;

FIG. 4 shows a cartridge 1 in the first embodiment shown in FIG.
It is a longitudinal cross-sectional view showing a state where 4 (flexible portion) is bent.

FIG. 5 is a diagram showing a relationship between the inclination direction of a surface 14a facing the inner peripheral side of the cartridge 14 and a retreat amount δ of a sub cutting edge 17b.

FIG. 6 is a longitudinal sectional view showing a second embodiment of the present invention.

FIG. 7 is a side view of the second embodiment shown in FIG.

FIG. 8 is a diagram of the second embodiment shown in FIG. 6, as viewed from the front end side.

FIG. 9 is a longitudinal sectional view showing a third embodiment of the present invention.

FIG. 10 is a side view of the third embodiment shown in FIG.

11 is a view of the third embodiment shown in FIG. 9 as viewed from the front end side.

12A is a vertical sectional view, FIG. 12B is a side view, and FIG. 12C is a view from the tip side of an example of a conventional throw-away type front milling machine.

FIG. 13 is (A) a longitudinal sectional view, (B) a side view, and (C) a view from the tip side showing another example of a conventional throw-away type front milling machine.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 11 Tool main body 14 Cartridge (flexible part) 17 Chip 15, 18, 21, 22, 33, 43, 46 Clamp screw 20 Positioning member (positioning part) 31 Positioning piece (positioning part) 45 Plate part (positioning part) 20a , 31a, 45a Outer end of each positioning part

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Mitsugu Tazawa 1511 Furamaki, Ishishita-cho, Yuki-gun, Ibaraki Pref. Mitsubishi Materials Corporation Tsukuba Works ) Surveyed field (Int.Cl. ⁷ , DB name) B23C 5/06-5/24

Claims (1)

(57) [Claims] A flexible portion whose tip is bent toward the radially outer peripheral side of the tool main body is provided on the outer periphery of the tool main body that is rotated around an axis, and the inner peripheral side of the flexible portion is An outer peripheral end is provided with a positioning portion capable of adjusting the amount of bending of the flexible portion by contacting the flexible portion, and a tip mounting seat is formed at a distal end portion of the flexible portion, so that a throw-away tip is provided. A throw-away type face milling machine, which is detachably mounted, and wherein the mounting position of the throw-away tip can advance and retreat in the axial direction according to the amount of bending of the flexible portion by the positioning portion. .