JP3063196B2 - Throwaway cutter - 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 cutter in which a plurality of throw-away chips are arranged in a staggered manner on the peripheral surface and both end surfaces of a cutter body such as a throw-away type pin mirror cutter. .

[0002]

2. Description of the Related Art FIGS. 1 to 7 show a conventional throw-away type pin mirror cutter (hereinafter, abbreviated as a pin mirror cutter), which is a conventional type of throw-away type cutter.

In FIGS. 1 to 3, reference numeral 1 denotes a disk-shaped cutter body 1 having an opening formed in the center. On the inner peripheral surface of the cutter body 1, first chip mounting seats 2 are formed in a zigzag pattern at equal intervals in a circumferential direction along each end face side. On the front side in the rotation direction of each chip mounting seat 2, a chip pocket 3 is formed in which the inner peripheral surface is removed in a concave shape. On the end surfaces 4 and 4 of the cutter body 1, second tip mounting seats 5 are formed along the inner peripheral surface in a staggered manner between both end surfaces and at equal intervals in the circumferential direction. ing. Tip pockets 6 are also formed on the front side of the tip mounting seat 5 in the rotation direction. Then, above the first chip mounting seat 2, indexable (hereinafter, abbreviated as chips.) 7 is removably mounted by a mounting bolt 9. On the other hand, the second chip mounting seat 5, the chip 8 is detachably mounted via a mounting bolt 9 as well.

As shown in FIGS. 4 and 5, the chip 7 is a thick plate-like member having upper and lower rake faces 10, 11 formed in a substantially trapezoidal shape. The ridgeline at the corner between the acute angles has an arc-shaped cutting edge 12,
12 are formed. And these cutting blades 12, 12
A straight cutting edge 13 is formed on the ridge between the two. The chip 7 has a seating surface 14 on a side surface connected between upper and lower surfaces of the upper and lower surfaces, and a mounting hole 15 is formed between the seating surface 14 and the facing surface.

On the other hand, as shown in FIGS. 6 and 7, the chip 8 is a thick plate-like member having upper and lower surfaces 16 and 17 formed in a substantially rectangular shape. Are each formed with an arc-shaped cutting blade 18. Also,
A side surface of the chip 8 that extends between the long sides of the upper and lower surfaces is a seating surface 19, and a mounting hole 20 is formed between the seating surfaces 19 so as to penetrate therebetween.

[0006] The tip 7 has its seating surface 14 set to the first position with one of the arc-shaped cutting edges 12 protruding from the end surface 4.
Is mounted in contact with the chip mounting seat 2. Here, a lateral clearance angle α of about 1 to 3 ° is formed on the flank 21 along the cutting edge 12. On the other hand, the tip 8 is attached to the second tip mounting seat 5 with the one arc-shaped cutting edge 18 protruding from the end face 4.

In the conventional pin mirror cutter having the above-described configuration, the outer peripheral portion of the cutter body 1 is fixed to driving means (not shown), and is sent in the radial direction while being rotated about an axis so that the straight cutting edge 13 is formed. The shaft outer peripheral surface of the crankshaft arranged in the central opening is
Cut the end faces of the crank with.

[0008]

In the above-mentioned conventional pin mirror cutter, the number of chips to be mounted is large, and furthermore, as shown in FIGS. Since the shape of the chip 7 to be mounted is different from the shape of the chip 8 to be mounted on the second chip mounting seat 5, there is a disadvantage that two types of chips need to be prepared. In addition, the tip 8 can use a total of eight cutting edges 18 at the upper and lower surfaces 16 and 17,
The tip 7 can use only the cutting edges 12 at a total of four corners on the upper and lower surfaces 10 and 11. For this reason, the frequency of replacement of the chip 7 increases, which is not economical, and the replacement time of the chips 7 and 8 is different from each other. In this respect as well, the management of the chip becomes complicated and it takes time. was there.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks of the conventional throw-away type cutter, and is economical because one chip can be mounted on all the chip mounting seats. It is an object of the present invention to provide a throw-away type cutter that can be easily replaced and managed.

[0010]

In order to solve the above-mentioned problems, a throw-away type cutter according to the present invention has a first tip mounting seat on both ends of a peripheral surface of a disk-shaped cutter body. Are formed in a zigzag pattern along the direction, and are spaced apart from each other so that the second chip mounting seats are arranged between the first chip mounting seats along the circumferential direction on the peripheral surface side of the both end surfaces. In the throw-away type cutter, which is formed in a staggered manner between the both end faces and the tip is detachably attached to the first and second tip attachment seats, the tip has an upper and lower surface having a parallelogram shape. The upper and lower surfaces have an arc shape at a corner portion sandwiching the acute angle.
And a second cutting edge having an arc shape is formed at a corner portion sandwiching the obtuse angle, and the first cutting edge protrudes from the end face at the first tip mounting seat. And the second cutting blade is mounted on the second chip mounting seat so as to protrude from the end face.

[0011]

Since the corner portion sandwiching the first cutting edge is formed at an acute angle, when the first cutting edge is mounted on the first chip mounting seat on the peripheral surface so as to protrude from the end surface, the first cutting edge is attached to the end surface side. A sufficient lateral clearance angle is secured. Also, a pair of first cutting blades on the upper surface are used in the first chip mounting seat along one end surface, and a pair of first cutting blades on the lower surface are used in the first chip mounting seat along the other end surface. Further, a pair of second cutting blades on the upper surface are used in the second chip mounting seat along one end surface, and a pair of second cutting blades on the lower surface are used in the second chip mounting seat along the other end surface. used. Therefore, all of the first and second cutting blades formed at a total of eight corner portions of the upper and lower surfaces of the chip can be sequentially used in these chip mounting seats.

Further, as a result of forming the chip in a parallelogram shape, even if the chip is mounted in the wrong orientation, the operator can easily recognize the mounting error.

[0013]

8 to 14 show a pin mirror cutter which is an embodiment of a throw-away type cutter according to the present invention. The same components as those shown in FIGS. 1 to 3 are denoted by the same reference numerals. The description is omitted here.

FIGS. 8 and 9 show a chip mounted on the pin mirror cutter. This chip 30
Is a thick plate having upper and lower surfaces 31 and 32 having a substantially parallelogram shape, and is integrally formed of a cemented carbide, cermet, or the like. Upper and lower surfaces 31, 32 of the chip 30
The first cutting edge 33 having an arc shape is formed at the ridge line of the corner portion sandwiching the acute angle, and the second cutting edge 34 having an arc shape is formed at the corner portion sandwiching the obtuse angle. .
Here, the angle of the corner portion sandwiching the first cutting edge 33 is in the range of 70 ° to 85 °. In addition, a ridge line on the long side between the cutting edges 33 and 34 has a straight cutting edge 29.
Are formed. Further, a side surface of the chip 30 that extends between the long sides of the upper and lower surfaces 31 and 32 is a seating surface 35, and a mounting hole 36 that penetrates between the seating surfaces 35 is formed between the seating surfaces 35. ing.

On the other hand, as shown in FIGS. 10 and 11,
In the cutter body 1 of the pin mirror cutter, the angle formed between the bottom surface 37 and the side surface 38 of the first chip mounting seat 2 is the same acute angle as the angle formed by the corner where the cutting edge 33 of the chip 30 is formed. It is formed so that it becomes. Also,
The angle formed between the bottom surface 40 and the side surface 41 of the second chip mounting seat 5 is formed so as to be the same obtuse angle as the angle formed by the corner where the cutting edge 34 of the chip 30 is formed.

[0016] Then, these first chip mounting seat 2 and the second chip mounting seat 5, each said chip 30 is detachably mounted via a mounting bolt 9. Here, in the first chip mounting seat 2 along one end surface 4a, the chip 30 is provided with a seating surface 35 with a first cutting edge 33 formed on the upper surface 31 protruding from the end surface 4a. And the side surfaces thereof are fixed by contacting the bottom surface 37 and the side surface 38 of the chip mounting seat 2, respectively. In the first tip mounting seat 2 along the other end face 4b, the tip 30 has a first cutting edge 33 formed on the lower surface 32 thereof protruding from the end face 4b. The side faces are the bottom face 37 and the side face 38 of the chip mounting seat 2, respectively.
It is fixed in contact with. Furthermore, one end face 4a
In the second chip mounting seat 5 along the edge, the chip 30 is connected to the second cutting edge 34 formed on the upper surface 31 by the end face 4.
In a state of protruding from a, the seating surface 35 and the side surface thereof are fixed to the bottom surface 40 and the side surface 41 of the chip mounting seat 5 respectively. In the second chip mounting seat 5 along the other end surface 4b, the chip 30 has its seating surface 35 and the second cutting edge 34 formed on the lower surface 32 thereof protruding from the end surface 4b. The side surfaces are fixed by contacting the bottom surface 40 and the side surface 41 of the chip mounting seat 5, respectively.

Here, as shown in FIG.
0 and the first and second chip mounting seats 2 and 5, respectively, in a state where the chip 30 is placed on the chip mounting seats 2 and 5, and the axis O of the mounting hole 36 is set to the mounting bolt of the chip mounting seat 2 and 5. only the end surface 4a small dimension a of the axis O ₂ of the screw holes 43 for 9, and is formed to be located 4b side. As a result, when the mounting bolt 9 is tightened into the screw hole 43, the tip 30 is moved by the wedge effect of the tapered head of the mounting bolt 9, so that the side surfaces 38,
41 and is firmly fixed.

According to such a pin mirror cutter, the cutting edge on the inner peripheral surface side and all the cutting edges on the end surface side of the cutter body 1 can be constituted by one chip 30, so that the chip management is easy. It becomes possible to. At this time, the first
Since the angle of the corner portion sandwiching the cutting edge 33 is set in the range of 70 ° to 85 °, the first cutting edge 33 projects from the end face 4 to the first chip mounting seat 2 on the inner peripheral surface. In the case of mounting, a sufficient lateral clearance angle can be secured on the end face 4 side. For this reason, the side surface of the chip 30 does not wear during cutting, so that when the opposing cutting blade 33 is used, the side surface can be brought into close contact with the side surface 38 of the chip mounting seat 2.

Moreover, a pair of first cutting edges 33 on the upper surface 31 are used in the first chip mounting seat 2 along one end surface 4a, and the first chip mounting seat 2 along the other end surface 4b.
A pair of first cutting blades 33 on the lower surface 32 are used,
Further, a pair of second cutting blades 34 on the upper surface 31 are used in the second chip mounting seat 5 along one end surface 4a, and the lower surface 3 in the second chip mounting seat 5 along the other end surface 4b.
Two pairs of second cutting edges 34 will be used. Therefore, a total of 8 of the upper and lower surfaces 31, 32 of the chip 30 is provided.
Since all of the first and second cutting blades 33 and 34 formed at the two corner portions can be sequentially used in these chip mounting seats 2 and 5, it is extremely economical.

Further, since the chip 30 is formed in a parallelogram shape, as shown in FIG.
Even if the orientation of the tip 30 is incorrectly attached, the side surface of the chip 30 does not contact the side surfaces 38 and 41 of the chip mounting seats 2 and 5, and the arc-shaped cutting edge 33 cannot have a sufficient lateral clearance angle. it, or because such chips 30 becomes too large separation dimension a ₂ between offset on the end face 4 side both axes and mounting bolts 9 and threaded holes 43 becomes impossible screwed,
The operator can easily recognize the mounting error. From such a viewpoint, the angle of the corner sandwiching the cutting edge 33 is preferably in the range of 70 ° to 85 °. If the angle is less than 70 °, a sufficient lateral clearance angle can be obtained, but it becomes difficult to machine the side surface 38 of the chip mounting seat 2, and particularly when the width of the chip 30 is large, When the angle exceeds 85 °, the first cutting edge 33 cannot maintain a sufficient lateral clearance angle, and the tip 30 is incorrectly oriented. This is because it is inconvenient that the mounting error cannot be easily determined when the mounting is performed.

In the above embodiment, the throw-away type cutter according to the present invention has been described as an example in which the present invention is applied to a pin mirror cutter having chip mounting seats formed on the inner peripheral surface and both end surfaces. However, the present invention is not limited to this. For example, even when the present invention is applied to a grooving or cutting cutter in which a tip mounting seat is formed on an outer peripheral surface and an end surface, a similar effect can be obtained.

[0022]

As described above, the throw-away type cutter according to the present invention has the upper and lower surfaces in the form of a parallelogram plate, and the first cutout in which the upper and lower surfaces are arc-shaped at corners sandwiching the acute angle. A tip is formed, and a tip having an arc-shaped second cutting edge formed at a corner portion sandwiching an obtuse angle is attached to a first tip mounting seat formed on a peripheral surface of a cutter body. Since the second cutting blade is protruded from the end face and is mounted on a second tip mounting seat formed on the end face of the cutter body by protruding from the end face, a total of eight upper and lower surfaces of one tip are provided. Since all of the first and second cutting blades formed at the three corners can be used sequentially,
Chip management is easy and very economical. Furthermore, since the chip is formed in a parallelogram shape, a sufficient lateral clearance angle can be maintained, and even if the chip is mounted in the wrong direction, the operator can easily recognize the wrong mounting. can do.

[Brief description of the drawings]

FIG. 1 is a front view showing a pin mirror cutter which is an example of a conventional throw-away type cutter.

FIG. 2 is a side view of the pin mirror cutter.

FIG. 3 is a layout view of a chip of the pin mirror cutter.

FIG. 4 is a plan view of a chip mounted on the pin mirror cutter.

FIG. 5 is a front view of the chip.

FIG. 6 is a plan view of another chip mounted on the pin mirror cutter.

FIG. 7 is a front view of the chip.

FIG. 8 is a plan view of a chip mounted on a pin mirror cutter according to one embodiment of the present invention.

FIG. 9 is a front view of the chip.

FIG. 10 is a layout view of a chip of the pin mirror cutter.

FIG. 11 is a layout view of the chip of the pin mirror cutter.

FIG. 12 is a plan view of a tip mounting portion of the pin mirror cutter.

FIG. 13 is a side view of the chip attachment portion.

FIG. 14 is a cross-sectional view of the chip attachment portion.

FIG. 15 is a cross-sectional view showing a state where the chip is mounted in the opposite direction.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cutter main body 2 1st chip mounting seat 4, 4a, 4b End face 5 2nd chip mounting seat 30 Throw-out chip 31 Upper surface 32 Lower surface 33 First cutting edge 34 Second cutting edge

Claims (2)

(57) [Claims] A first chip mounting seat is formed in a staggered shape along the circumferential direction on both end surfaces of a peripheral surface of a disk-shaped cutter body, and a first chip mounting seat is formed on the peripheral surface side of the both end surfaces. the second chip mounting seat along the circumferential direction each first chip mounting
A throw-away cutter, which is formed in a staggered manner between the two end faces while being spaced from each other so as to be disposed between the seats, and wherein the throw-away chips are detachably attached to the first and second tip attachment seats, The upper and lower surfaces of the throw-away tip are in the form of a parallelogram plate, and the upper and lower surfaces are formed with a first cutting edge having an arc shape at a corner portion sandwiching the acute angle and sandwiching the obtuse angle. A second cutting edge having an arc shape is formed at the corner portion, the first cutting edge protrudes from the end face at the first chip mounting seat, and the second cutting edge is formed at the second chip mounting seat. 2. A throw-away cutter, wherein two cutting blades are mounted so as to protrude from the end face. 2. The throw-away cutter according to claim 1, wherein the acute angle at the corners of the upper and lower surfaces of the throw-away tip is in a range of 70 ° to 85 °.