JPH09290306A - Cutter for mounting irregular shape tip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To mount an irregular shape tip to the same cutter. SOLUTION: A positive regular octagonal chip and a circular tip are mounted to the same cutter installation seat 33 selectively. The lower surface 25 of the circular tip is formed by the same size regular octagon as the regular octagonal chip and the reference side surface 27 with a nearly angled plane is installed facing to the cutting edge 24 of the upper surface from each side respectively. The surface 27 is formed with the same angle as the side surface of the regular octagonal tip. The lower surface 25 of each chip is seated on the bottom surface 34 of the tip installation seat 33 and a projection 36 is inserted in the recessed part 31b of a tip hole 31 and the surface 27 is contacted to two side walls 38, 39 and screwed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plurality of types of regular polygonal indexable inserts having different numbers of corners, and a cutter capable of selectively mounting regular polygonal and circular chips.

[0002]

2. Description of the Related Art Conventionally, as a throw-away type cutter,
For example, there is a throw-away type face milling cutter as shown in FIGS. This face mill 1 has a central axis O
Recessed cutter body 2 which is rotatable centering on the outer periphery of the tip has concave groove-shaped chip pockets 3 at predetermined intervals, and chip mounting seats 4 are formed on the wall surface of each chip pocket 3 facing forward in the rotation direction. The throw-away tip 5 is detachably attached to the attachment seat 4. The throw-away tip 5 is, for example, a regular octagonal plate-shaped positive tip, and the ridge line portion of the regular octagonal upper surface 6 forming a rake face has a cutting edge 7.
And a flat side surface 9 is formed which inclines outward from each ridge (side) of the regular octagonal lower surface 8 forming the seating surface toward each cutting edge 7, and each side surface 9 serves as a flank. There is. Then, a hole 10 for inserting a screw is bored from the lower surface 8 through the center of the upper surface 6.

The chip mounting seat 4 has a bottom surface 12 on which a chip lower surface 8 is seated, and a plurality of chip side surfaces 9 are formed.
Are formed to form two side walls 13 and 14 spaced from each other for positioning the chip. In order to mount the throw-away tip 5 on the cutter body 2, the side surfaces 9 of the tip 5 are brought into contact with the side walls 13 and 14 of the tip mounting seat 4 for positioning, and the screw 15 is inserted into the hole 10 and the bottom surface 12 is inserted.
Screw the tip 5 to the.

[0004]

By the way, in such a throw-away type front milling cutter 1, the tip mounting seat 4 is used.
Only one type of tip was attached to the blade, and cutting with a different type of tip had to use another cutter having a mounting seat for such a tip. The present invention has been made in view of the above problems, and an object of the present invention is to provide a cutter in which differently shaped chips can be directly and selectively mounted on the chip mounting seats of the same cutter.

[0005]

The cutter according to the present invention comprises:
It is characterized in that regular polygonal chips and circular chips can be selectively mounted. It is economical because multiple types of throw-away tips can be selectively attached to one cutter. The circular chip has a lower surface having the same shape as the lower surface of the regular polygonal chip, and a flat surface portion is formed on each side surface of the circular chip from each side of the lower surface of the chip to the ridge line portion forming the cutting edge of the upper surface. May be. Even if the shape of the cutting edge of each tip is different, since the bottom surface of the tip forming the seating surface is the same and the contact surface with the side wall is a flat part that inclines at the same angle, a different shape for one cutter The tip of can be installed selectively.

The cutter according to the present invention is characterized in that a plurality of types of regular polygonal chips having different numbers of corners can be selectively mounted. Each regular polygonal chip is a positive chip in which the upper and lower surfaces are substantially parallel to each other, the lower surface is planar, and the side surfaces are inclined outward from the lower surface toward the upper surface. The circular chip is also a positive chip in which the upper and lower surfaces are substantially parallel to each other, the lower surface is flat, and the side surfaces are inclined outward from the lower surface toward the upper surface. On the lower surface of the regular polygonal chip and the circular chip, a recess having an enlarged diameter for a screw insertion hole is formed. Further, the tip mounting seat of the cutter body may be provided with a bottom surface on which the bottom surface of the tip is seated and a plurality of side walls with which side surfaces or planar portions of the tip abut. Around the screw hole on the bottom surface of the chip mounting seat, there is provided a protrusion that fits into a recess on the lower surface of the chip.

[0007]

FIG. 1 is a block diagram showing an embodiment of the present invention.
8 to 8, the same parts or members as those in the above-described conventional art are designated by the same reference numerals and the description thereof will be omitted. 1 is a front view of a regular octagonal chip according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA in FIG. 1, FIG. 3 is a bottom view of the throw-away chip shown in FIG. 1, and FIG. FIG. 5 is a front view of the circular tip according to the embodiment, FIG. 5 is a sectional view taken along the line BB in FIG. 4, FIG. 6 is a bottom view of the throw-away tip shown in FIG. 4, and FIG. 7 is a tip mounting seat for the cutter according to the present embodiment. FIG. 8 is a perspective view of the chip mounting seat shown in FIG. 7. The regular octagonal plate-shaped throw-away tip 5 shown in FIGS. 1 to 3 has the same shape as that described above. In the regular octagonal tip 5, breaker grooves 20 are formed over the entire circumference inside the cutting edge 7 on the upper surface 6, and concave grooves 20a are further formed on the bottom surface at predetermined intervals. In addition, the central hole 10 for inserting the screw 15
When viewed in the axial direction, the upper portion on the upper surface 6 side is a diameter-expanded portion 10a for accommodating the head of the screw 15, and the lower portion on the lower surface 8 side is gradually expanded in the lower surface 8 direction for fitting a protrusion described later. It forms a recess 10b having a diameter. The distance from the center of the hole 10 to each cutting edge 7 forming the eight ridges of the upper surface 6 of the chip 5 is set to the same dimension L (see FIG. 3).

Next, FIGS. 4 to 6 show a throw-away tip 22 which is a circular plate-shaped positive tip, and a ridge line portion of a circular upper surface 23 which is a rake face is a cutting edge 24.
The lower surface 25 forming the seating surface is a regular octagon having the same dimensions as the lower surface 8 of the regular octagonal tip 5 described above. Also,
The side surface 26 of the tip 22 forms a flank that inclines outward from the lower surface 8 toward the upper surface 6, and has a substantially mountain-like planar shape in which the width gradually narrows from each side of the lower surface 25 to the cutting edge 24 of the upper surface 23. Of the reference side surfaces 27 are formed. The inclination angle of the reference side surface 27 with respect to the upper surface 23 or the lower surface 25 is the same as the inclination angle of the side surface 9 of the regular octagonal chip 5. A curved surface 28 having a width gradually narrowing from the upper surface 23 toward the lower surface 25 is formed between the adjacent reference side surfaces 27 of the side surface 26, and each of them forms a part of the peripheral side surface of the truncated cone.

Further, on the upper surface 23, breaker grooves 29 are formed inside the cutting edge 24 over the entire circumference thereof, and concave grooves 29a are further formed at predetermined intervals on the bottom surface thereof. Further, the hole 3 for inserting the screw 15 penetrating the centers of the upper and lower surfaces 23, 25.
1 has an enlarged diameter portion 31a for accommodating the head portion of the screw 15 in the axial direction, and a lower portion has a concave portion 31b whose diameter gradually increases in the direction of the lower surface 25 for fitting a protrusion described later. ing. The distance from the center of the hole 31 to the cutting edge 24 (and the contact point between the reference side surface 27) on the upper surface 23 of the chip 22 is set to the same dimension L (see FIG. 6). Therefore, the circle forming the cutting edge 24 of the circular tip 22 is dimensioned to be a regular octagonal inscribed circle forming the cutting edge 7 of the regular octagonal tip 5.

7 and 8 show the regular octagonal chip 5 described above.
3 shows a tip mounting seat 33 of the cutter body 2 of the front milling cutter 1, to which the circular tip 22 can be selectively mounted. In the chip mounting seat 33, the bottom surface 34 is a flat surface, and a screw hole 35 is cut in the center thereof in a direction orthogonal to the bottom surface 34. And the screw holes 3 on the bottom surface 34
Around the periphery of 5, there is formed a substantially cylindrical protrusion 36 that is slightly eccentric to the screw hole 35, and the holes 10, 3 of the chips 5, 22 are formed.
It is adapted to be fitted in the first recess 10b, 31b.
Then, above the side surface of the chip mounting seat 33, the recessed hole 3
7, flat side walls 38, 39 are formed on both sides of the chip 7, and the side walls 38, 39 are formed on the chips 5, 22.
In order to receive the side surface 9 and the reference side surface 27, the inclination angle is set to be the same as or slightly larger than the side surface 9 and the reference side surface 27.

Incidentally, in FIG. 7, a virtual point m1 overlapping the screw hole 35 is located at the center of the screw hole 35. And
An imaginary point m2, which is slightly displaced from the point m1 to the outside of the tool body 2, is located at the center of each tip 5, 22 in the mounted state,
This point m2 has the same distance from the side walls 38 and 39 of the chip mounting seat 33 and is designated as L1. Moreover, the side wall 3
8 and 39 are set to L1 <L in order to receive the side surface 9 and the reference side surface 27 at a position slightly lower than the cutting edges 7 and 24 of the mounted chips 5 and 22. Since the center m1 of the screw hole 35 is located inside the center m2 of the chips 5 and 22 when the chips 5 and 22 are mounted on the chip mounting seat 33, the chips 5 and 22 are located on the side wall 38 of the chip mounting seat 33. It will be fixed by being screwed in the state of being pressed against 39.

Since the front milling cutter 1 according to the present embodiment has the above-mentioned structure, for example, when the regular octagonal chips 5 are mounted on the respective chip mounting seats 33 of the cutter body 2,
The chip lower surface 8 is placed on the bottom surface 34, and the recess 10 of the hole 10 is
Fit b into the protrusion 36. Then, when the screw 15 is tightened, the two chip side surfaces 9 and 9 in directions orthogonal to each other are pressed against the side walls 38 and 39, and the chip lower surface 8 is pressed against the bottom surface 34 to be positioned at a predetermined position. , Held fixed. In this state, the work material is cut. Next, the regular octagonal tip 5 is removed from each tip mounting seat 33 of the cutter body 2 to remove the circular tip 22.
In this case, the chip lower surface 25 is placed on the bottom surface 34, and the recess 31b of the hole 31 is mounted.
Are fitted to the protrusions 36. Then, when the screw 15 is tightened, the two chip reference side surfaces 27, 27 in the directions orthogonal to each other are pressed against the side walls 38, 39, while the chip lower surface 25 is pressed against the bottom surface 34 and positioned at a predetermined position. And fixedly held.

As described above, according to the present embodiment, the regular octagonal chip 5 and the circular chip 22 having different shapes can be selectively mounted on the same chip mounting seat 33, and each type of chip can be mounted. It is economical because there is no need to prepare another cutter with different tip mounting seats.

In the above-mentioned embodiment, the regular octagonal tip 5 and the circular tip 22 are selectively mounted on the same tip mounting seat 33, but the present invention is not limited to this and other differently shaped tips. May be selectively attached. That is, a plurality of types of regular polygonal chips, for example, regular octagonal chips and regular dodecagonal chips may be selectively mounted. Alternatively, the side walls 38, 39 of the chip mounting seat 33
The position of may be adjusted so that the regular hexagonal chip and the regular dodecagonal chip can be selectively mounted. Further, the lower surface of the circular chip 22 may be formed in the same shape as the regular polygonal shape of the lower surface of the regular polygonal chip that is selectively mounted, and the planar reference side surface may extend from each side of the lower surface. For example, if the polygonal tip is a regular hexagon, the bottom of the circular tip is a regular hexagon, and a flat reference side surface that inclines outward from each side toward the cutting edge of the upper surface is formed. May be selectively attached.

Further, in the above-described embodiment, the reference side surface 27 of the circular chip 22 is made to extend from the lower surface 25 to the upper surface 23 as shown in FIG. It suffices that the chip be brought into contact with the plurality of side walls 38, 39 to fulfill the function of fixing and positioning the chip, and it may be partially formed in the region of the side surface 26 on the upper surface 23 side or the lower surface 25 side. Further, the side surface of the tip that abuts against the side walls 38 and 39 of the tip mounting seat 33 does not have to be a single surface as in the above-described embodiment, and for example, as shown in FIG. The mounting surface 42 following the above may be a plurality of inclined surfaces provided on the lower surface side. Then, the mounting surface 42 may abut on the side wall 38 or 39.

[0016]

As described above, the cutter capable of selectively mounting the irregularly shaped chips according to the present invention is capable of selectively mounting the regular polygonal chip and the circular chip. Since various types of regular polygonal chips can be selectively mounted, a plurality of types of chips can be mounted with the same cutter, and it is not necessary to prepare different cutters for different chips, which is economical. In addition, the circular chip has a bottom surface having the same shape as the bottom surface of the regular polygonal chip, and a flat surface portion is formed on the side surface of the chip between each side of the bottom surface of the chip and the ridge line portion forming the cutting edge of the top surface. Since it is formed, it can perform the positioning and the rotation preventing function of the chip like the regular polygonal chip. .

[Brief description of drawings]

FIG. 1 is a front view of a regular octagonal chip according to an embodiment of the present invention.

2 is a cross-sectional view taken along the line AA of the chip in FIG.

3 is a bottom view of the throw-away tip shown in FIG. 1. FIG.

FIG. 4 is a front view of a circular tip according to an embodiment of the present invention.

5 is a cross-sectional view of the chip in FIG. 4 taken along the line BB.

6 is a bottom view of the throw-away tip shown in FIG. 4. FIG.

FIG. 7 is a plan view of the tip mounting seat of the cutter according to the present embodiment.

8 is a perspective view of the chip mounting seat shown in FIG. 7. FIG.

FIG. 9 is a diagram showing a modification of the side surface of the throw-away tip according to the embodiment.

FIG. 10 is a sectional view of a main part of a front milling cutter.

11 is a bottom view of a main part of the front milling cutter shown in FIG.

[Explanation of symbols]

 1 Face Milling 2 Cutter Main Body 5 Regular Octagonal Tip 9 Side 22 Circular Tip 27 Reference Side 33 Tip Mounting Seat 34 Bottom 38, 39 Side Wall

Claims (4)

[Claims] 1. A cutter capable of selectively mounting a regular polygonal tip and a circular tip. 2. The circular chip has a chip lower surface having the same shape as the lower surface of the regular polygonal chip, and on the chip side surface, from each side of the chip lower surface to a ridge line portion forming a cutting edge of the chip upper surface. The cutter according to claim 1, wherein a planar portion is formed between the cutters. 3. A cutter capable of selectively mounting a plurality of types of regular polygonal chips having different numbers of corners. 4. The tip mounting seat of the cutter body of the cutter is provided with a bottom surface on which the bottom surface of the tip is seated and a plurality of side walls with which the side surface of the tip or the planar portion abuts. The cutter according to any one of claims 1 to 3.