JPH0852611A - Throw-away type roll cutting tool - Google Patents

Abstract

PURPOSE:To maintain the high rigidity of a chip for removing burs and prevent the defect of a cutting blade or the breakage of a chip main body and to increase the number of times of using the cutting blade for one chip and effectively use a chip material. CONSTITUTION:Throw-away chips 14 and 15 are detachably attached to chip attaching seats 13A and 13B formed on the outer periphery of the tip end part of a tool main body 11. At least one of them is a circular bur removing chip 14 which has a circumferential cutting blade 20 formed on the intersecting edge line part of at least one side surface 19a to the circumferential surface 19c of a circular flat plate like chip main body 19. The chip 14 is mounted so that a part of the circumferential surface 19c serving as a cutting face is directed to the rotational direction of a tool and one side surface 19a serving as a flank is directed to the tip end side of the tool.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a throwaway insert such as a face milling cutter, in which a throwaway tip (hereinafter referred to as a tip) is detachably attached to a tool body which is rotated around an axis, and a cutting blade is provided. Type rolling tool.

[0002]

2. Description of the Related Art In cutting with a face milling machine of this type, it has been proposed to provide a deburring blade or a flat blade in order to prevent burrs and feed marks from remaining on the machined surface and degrading the accuracy of the machined surface. ing. FIG. 6 and FIG. 7 show an example of such a face milling cutter, in which a plurality of tip mounting seats 2 ... Are formed on the outer periphery of the tip of the tool body 1 rotated around the axis O, and these tips are A tip 3 for mainly cutting and a tip 4 for deburring (burr removing tip) 4 are detachably attached to the mounting seats 2 by a seat 5 and a wedge member 6.

Here, in the face milling cutter shown in these figures, the chip 3 for main cutting has a substantially square flat plate shape as shown by a broken line in FIG. 6, and the tool rotating direction (white arrow in FIG. 7). When viewed from the (line direction) side, it is attached at a slight inclination with respect to the axis O, and cutting is performed by the main cutting edge 7 extending to the tool outer peripheral side and the sub cutting edge 8 located on the tool tip side. On the other hand, the deburring tip 4 has a trapezoidal flat plate shape as shown by a solid line in FIG. 6, and is also attached to be inclined with respect to the axis O. And this chip 4
Cutting is performed by the main cutting edge 7 and a deburring blade 9 extending in a plane direction orthogonal to the axis O. The deburring blade 9 scrapes off burrs and the like on the machined surface to form a smooth machined surface. It is designed to be obtained.

[0004]

By the way, as such a deburring tip 4, in addition to the trapezoidal flat plate-shaped tip described above, for example, a convex deburring cutting edge portion protruding toward the outer peripheral side of the tool is provided. However, since the deburring tip 4 has been conventionally attached to the tool main body 1 with its thickness direction oriented in the tool rotation direction, like the other tips 3 for main cutting. There is a problem that it is difficult to secure high chip rigidity. Therefore, when an excessive cutting load is applied to the tip 4 and the cutting blade 9, especially in a tip or the like having a deburring cutting edge portion protruding to the outer peripheral side, the cutting edge may be damaged or the tip 4 may be damaged. There is a risk that it will be damaged and its life will be significantly shortened.

Further, such a deburring tip 4 is
Since the trapezoidal shape shown in FIGS. 6 and 7 is generally a special shape, the number of deburring blades 9 that can be formed on one chip 4 is limited. As described above, most of them have only one deburring blade 9 and at most about two. However, in the throw-away type cutting tool provided with such a deburring tip 4, the deburring blade 9 of 1 or 2 of this tip 4 is used.
If the chip wears, the chip 4 must be replaced, which is very uneconomical from the viewpoint of effective utilization of the chip material. Further, in the above face milling machine, the deburring blade 9 of the deburring chip 4 is formed so as to extend in the radial direction with respect to the axis O of the tool body 1 as shown in FIG. However, there is a possibility that the cutting shape will bite into the work material at one time, and thus an impact load may act on the deburring blade 9 to further promote the defect.

The present invention has been made under such a background, and provides a throw-away type cutting tool which is provided with a tip to be used as a deburring or smoothing blade and which can improve the rigidity of the tip. The present invention aims to provide a throw-away type rolling tool capable of increasing the number of times the cutting edge of the deburring tip can be used and avoiding an impact load. .

[0007]

In order to solve the above problems and to achieve the above object, a throw-away type rolling tool according to claim 1 of the present invention is an outer periphery of a tip end portion of a tool body rotated about an axis. In a throw-away type milling tool in which a plurality of insert mounting seats are formed, and inserts equipped with cutting blades are removably mounted on these insert mounting seats, at least one of the inserts is a flat plate. A chip for deburring in which the cutting edge is formed on the ridge line portion intersecting at least one side surface and at least a part of the peripheral surface of the chip body, and this deburring chip is used as a rake surface for a part of the peripheral surface. It is characterized in that it is mounted toward the tool tip side while facing the tool rotation direction side and using the one side surface as a flank. Further, in a throw-away type rolling tool according to claim 3, in addition to the configuration of claim 1, the side surface of the chip body is formed in a circular shape, and the peripheral surface is a circumferential surface. Thus, the circular tip is characterized in that the cutting edge is formed at the circumferential intersection ridge portion of the side surface and the circumferential surface.

[0008]

In the throw-away type cutting tool having the above-mentioned structure, the flat chip body of the deburring chip is
A part of the peripheral surface is faced to the tool rotation direction side as a rake surface and one side surface is directed to the tool tip side as a flank surface, and a cut formed on the ridge line intersection of these one side surface and part of the peripheral surface. The blade is used for cutting as a deburring cutting edge or a flat edge. That is, this deburring tip is
It is attached so that its thickness direction is parallel to the direction of the tool axis, and it is a so-called vertical blade, in which the cutting load of the cutting edge acts from the cutting edge of the insert toward the rear in the tool rotation direction. Since the direction of movement and the width direction of the side face of the flat plate-shaped chip body, that is, the direction in which the thickness of the chip body increases, are high, it is possible to secure high chip rigidity. Incidentally, it is desirable that the cutting edge used for the deburring or the like has a sharp cutting edge. Therefore, the deburring tip has a part of the peripheral surface to be a rake surface and the one of the flanks to be a flank. It is desirable that the side surface is a positive tip that intersects at an acute angle through the cutting edge.

Further, as in the third aspect of the present invention, a circular tip having a circumferential cutting edge is used as the deburring tip, and one side surface of the circular shape is used as a flank on the tool tip side. When it is attached to the tool body toward this side, a clearance angle is given to this one side surface, so that the cutting edge has an elliptical shape with a large radius of curvature that bulges toward the tool tip side when viewed from the tool rotation direction side. Since the cutting surface with this large radius of curvature will be scraped off as the tool body is fed, even if burrs etc. are generated by cutting with a cutting edge other than the above circular tip, the burrs etc. are removed and smoothed. It is possible to obtain various processed surfaces.

Moreover, in the throw-away type cutting tool using the circular tip as the deburring tip, the circular cutting edge formed on the circular tip is used for deburring and the like. Since it is only a part of the arcuate part located on the tool rotation direction side, if this part becomes unusable due to wear or damage, rotate the circular tip appropriately around its circumference and leave it unused. By arranging the cutting edge part on the tool rotation direction side, it is possible to easily use a new cutting edge, and the number of times the cutting edge can be used in one tip is more than several times that of the conventional one. Can be increased. Furthermore, in this case, the cutting edge used for cutting has an elliptical shape (substantially arcuate shape) that bulges in the tool rotation direction side when viewed from the tool tip side, so the cutting edge is the portion that bulges most in the tool rotation direction. Therefore, it gradually eats into the work material, which can prevent the impact load from acting on the cutting edge.

When a circular tip is used as the deburring tip as described above, the clearance angle given to the one side surface, which is the clearance surface of the circular tip, is sufficiently small if the clearance angle is too small. However, if the clearance angle is too large, the radius of curvature of the ellipse presented by the cutting edge when viewed from the tool rotation direction side will be small, and a smooth machined surface will be obtained. There is a risk that it will not be possible. For this reason, it is preferable that the clearance angle given to the one side surface when a circular chip is used as the deburring chip, that is, the clearance angle of the cutting edge for deburring, is set to 4 to 15 °.

Further, in this case, if the radius of one side surface of the circular tip is too large, the circular tip is attached to the vertical blade as described above, depending on the size of the tool body. May interfere with the chip of
On the contrary, if this radius is small, the radius of curvature of the cutting edge as viewed from the tool rotation direction becomes small as described above, and the number of times the cutting edge can be used in one tip may not be sufficiently increased. For this reason, when a circular tip is used as the deburring tip, the radius of the one side surface forming the circle is preferably set to 3 to 15 mm.

[0013]

1 to 5 show an embodiment of the present invention. In these drawings, the tool main body 11 has a substantially disk shape that is rotated around its axis O, and a plurality of outer peripheral surfaces of the tool main body 11 are opened to the tip end surface 11A of the tool main body 11 and are recessed toward the inner peripheral side of the tool. Chip pockets 12 are formed at intervals in the circumferential direction, and these chip pockets 1 are formed.
Tip mounting seats 13 are formed on the rear side of the tool rotation direction 2 (the direction of the white arrow in the figure). At least one of the tip mounting seats 13 ... Has a deburring tip 14 attached to at least one tip mounting seat 13A, and the remaining remaining tip mounting seats 13B ... Is installed.
The deburring tip 14 depends on the size of the tool body 11 and the number of main tips 15 to be mounted.
It is desirable that about four pieces are mounted so as to be arranged at equal intervals in the circumferential direction of the tool body 11.

Here, the main tip 15 is formed of a hard material such as cemented carbide into a substantially square flat plate shape, and one side surface 15a forming the square is a rake surface, and
Four peripheral surfaces 15b ... Arranged around the side surface are flanks, and main cutting edges 16 are formed at the ridges of the intersections of the side surface 15a and the peripheral surface 15b. The side surface 15b serving as the flank includes the one side surface 15a.
From the other side to the side surface 15c side, an inclination toward the inside of the chip is provided, which is a so-called positive chip.

Of the tip mounting seats 13, the tip mounting seat 13B on which the main chip 15 is mounted is formed so as to communicate with the tip pocket 12A on the front side in the tool rotation direction and to be recessed toward the inner peripheral side of the tool. The main chip 15, the sheet 17, and the wedge member 18 are inserted into the chip mounting seat 13B in this order from the tool rotation direction side, and the wedge member 18 is attached by a clamp screw or the like (not shown). The main chip 15 is pressed and fixed to the tool main body 11 by tightening the inner peripheral side of the tool. Then, in this mounted state, the main chip 15
Is arranged such that the one cutting edge 16 is located on the outer peripheral side of the tool and extends from the tool front side to the rear end side, and the main cutting is performed by this cutting edge 16. The main tip 15 has a cutting edge 16 on the outer peripheral side of the tool that is used for cutting, so that a positive rake angle is provided in the axial O direction and the radial direction of the tool body 11 and in the tool rotation direction side. The cutting edge 16 is arranged so as to slightly incline toward the outer peripheral side of the tool from the front end side toward the rear end side.

On the other hand, the deburring tip 14 is also made of a hard material such as a cemented carbide like the main tip 15, but in the present embodiment, it has a substantially disk-shaped tip body 19. It is a round chip. However, the circular side surfaces 19a and 19b of the chip body 19 of the deburring chip 14 are formed so as to be coaxial with each other, and one side surface 19a has a larger diameter than the other side surface 19b. Has been done. Therefore, these side surfaces 19
The circumferential surface 19c arranged around a and 19b is the side surface 1
The side surface 19 extends along the thickness direction of the chip body 19 from the 9a side.
The tip body 19 is formed in a truncated cone shape in a strict sense, that is, the tip body 19 is gradually reduced in diameter toward the side b. Further, a cutting edge 20 for deburring is formed at a circumferential intersection ridge portion formed by the circumferential surface 19c and the one side surface 19a, so that the deburring tip 14 is also a positive tip. ing. The radius of the circumferential cutting edge 20, that is, the radius R of the circular side surface 19a of the tip body 19 is set to 3 to 15 mm in this embodiment. At the center of the chip body 19 of the deburring chip 14, the chip body 19 is formed along the central axes of the both side surfaces 19a and 19b.
A mounting hole 21 is formed so as to pass through in the chip thickness direction.

The tip mounting seat 13A to which the deburring tip 14 is attached has a bottom surface 13a formed so as to be recessed from the front end surface 11A of the tool body 11 to the rear end side, and the bottom surface 13a to the tool front end side. It is a recess defined by a rising wall surface 13b having a semi-circular arc surface, and is formed so as to communicate with the tip pocket 12B on the front side thereof.
The tip pocket 12B located in front of the tip mounting seat 13A is formed so as to be depressed more toward the inner circumference side of the tool than the tip pocket 12A located in front of the main tip 15. The circular deburring tip 14 has such a tip mounting seat 13A that the other side surface 19b of the tip body 19 is brought into close contact with the bottom surface 13a, and a part of the circumferential surface 19c (approximately half). ) Is seated against the wall surface 13b, and a mounting screw 22 inserted into the mounting hole 21 from the tool tip side is screwed into a mounting screw hole (not shown) formed in the bottom surface 13a. The tip mounting seat 1
It is fixed at 3A.

Thus, in the deburring tip 14, the one side surface 19a faces the tool tip side and serves as a flank, while the circumferential surface 19c faces the tool rotation direction. The cutting edge is a rake face, and further, the circular cutting edge portion of the circumferential cutting edge 20 that faces the tool rotation direction side of the ridge line portion intersecting the flank surface and the rake surface is used for cutting. In addition, as shown in FIG. 1, the deburring tip 14 is located on the outer peripheral side of the tool in the rotation locus around the axis O of the tool body 11 and is cut from the cutting edge 16 of the main tip 15 used for main cutting. Is also located slightly on the inner circumference side of the tool. The portion of the deburring tip 14 used for cutting the cutting edge 20 is
The cutting edge 16 used for cutting the main tip 15 is arranged so as to project slightly further toward the tool tip side than the tip in the direction of the axis O. Here, the protrusion amount δ of the tip of the cutting edge 20 of the deburring tip 14 with respect to the tip of the cutting edge 16 of the main tip 15 in the direction of the axis O is preferably set to about 0.01 to 0.3 mm, In this embodiment, it is 0.1 mm.

Further, the bottom surface 13a of the tip mounting seat 13A facing the tool tip side is formed so as to be inclined toward the rear end side in the axis O direction as it goes rearward in the tool rotation direction. Along with this, the side surface 19a of the deburring tip 14 mounted on the tip mounting seat 13A, which faces the tool tip side, is also arranged to be inclined toward the rear end side in the axis O direction toward the rear side in the tool rotation direction. A clearance angle α is given to the clearance surface. Here, this clearance angle α is 4 to
It is desirable to set it to 15 °, and in this embodiment it is set to 4 °. Further, as described above, since the chip body 19 of the deburring chip 14 is a positive chip, the side surface 19a, which is a flank in this embodiment, is provided with such a clearance angle α, but the rake surface is The circumferential surface 19c is arranged so as to incline toward the rear side in the tool rotation direction toward the rear end side in the direction of the axis O, whereby the cutting edge 20 used for cutting has a positive axial rake angle β.
Is given.

In the throw-away type rolling tool having such a structure, the cutting tool formed on the main insert 15 is formed by feeding the tool body 11 in the direction orthogonal to the axis O while rotating the tool body 11. 16 and deburring tip 1
The work material is cut by the cutting edge 20 of 4. here,
The cutting edges 16 of the main chip 15 are arranged on the outer peripheral side of the tool and the cutting edges 20 of the deburring chip 14 are arranged on the inner peripheral side of the tool 14 and 15 in the rotational trajectory about the axis O. The cutting edge 20 of the deburring tip 14 cuts the machined surface scraped off by the cutting edge 16 of the main chip 15 because it is arranged so as to slightly project on the tip side in the direction of the axis O. It becomes a cutting form.

However, in the throw-away type cutting tool having the above construction, the deburring tip 14 has one side surface 19a of the disk-shaped tip body 19 facing toward the tool tip side, that is, a flat tip. The main body 19 is attached so that the thickness direction of the main body 19 is parallel to the axis O of the tool main body 11, and is attached to the tool main body 11 in a so-called vertical blade state. In other words, the deburring tip 14 is The diametrical direction is attached so as to match the tangential direction of the tool rotation direction in the cutting blade 20 used for cutting. Therefore, according to the throw-away type rolling tool having the above-described configuration, in the diametrical direction where the wall thickness is the largest in the flat plate-shaped (disc-shaped) chip body 19, and the load at the time of cutting is the cutting blade 20.
Will be in agreement with the direction of action. For this reason, it becomes possible to secure a high chip rigidity in the deburring chip 14, and even if an excessive cutting load acts, stable cutting can be performed against this, and the cutting blade is affected by such a load. It is possible to prevent a situation in which the chip 20 is damaged or the deburring tip 14 itself is damaged.

By the way, in the present embodiment, a circular tip is used as the deburring tip 14, and such a deburring tip 14 has a tool body with one circular side surface 19a of the tip body 19. The side surface 19a is mounted so as to be inclined so that a clearance angle α is given to the side surface 19a. Therefore, the side surface 1
The circumferential cutting edge 20 formed on the ridge portion where 9a intersects with the circumferential surface 19c serving as the rake face also moves toward the rear end side in the direction of the axis O toward the rear side in the tool rotation direction along the circumference. As a result, the arcuate portion on the tool rotation direction side used for cutting by the cutting edge 20 bulges toward the tool tip side as viewed from the tool rotation direction side. The cutting tool 20 has an elliptical shape with a large radius of curvature. By cutting the processing surface of the cutting edge 16 of the main chip 15 with such a cutting edge 20, the throw-away type rolling tool according to the present embodiment is mainly used. Even if burrs or the like are formed in the cutting of the tip 15 by the cutting edge 16, the cutting edge 20 scrapes off the burrs to obtain a smooth machined surface.

Here, in the present embodiment, of the circumferential cutting blades 20 formed on the disc-shaped deburring tip 14, what can be used in the state of being attached to the tool body 11 is as follows. Since the cutting edge 20 is arranged in a tilted manner as described above, since it is only a substantially arcuate portion that faces the tool rotation direction side, it is actually used for cutting in the tool rotation direction. Side and the tool tip side, there is only a smaller arc-shaped portion. Therefore, when the cutting blade 20 in this portion is worn or damaged by cutting, the mounting screw 22 is loosened so that the unused portion of the cutting blade 20 is located on the tool rotation direction side and the tool tip side. By appropriately rotating the chip body 19 so as to be used for cutting, and fixing the mounting screw 22 again to fix the deburring chip 14,
It is possible to easily recover the sharpness of the cutting edge 20 for deburring.

By the time the entire circumference of the circumferential cutting edge 20 is used, depending on the size of the deburring tip 14, the clearance angle α, and the protrusion amount δ, it can be reused about eight times. According to the present embodiment, it is possible to increase the number of times of use of the cutting edge several times or more as compared with the conventional rolling tool in which one tip can be used only once or twice. You can Therefore, according to the throw-away type cutting tool having the above structure, the insert material can be effectively used for the deburring tip 14, and the throw-away type cutting tool is provided with the deburring function and is economically excellent. Can be provided. Moreover, this deburring tip 1
For example, it is possible to use a circular tip used for contour cutting in the turning process, and it is not necessary to prepare a tip having a special shape as in the conventional case, which further improves the economical efficiency. The advantage that it can be achieved is also obtained.

Further, the portion of the deburring tip 14 used for cutting the cutting edge 20 is shown in FIG.
As shown in FIG. 3, the cutting edge 20 has a substantially arcuate shape that bulges in the tool rotation direction side. Therefore, the cutting edge 20 gradually burrs from the portion located closest to the tool rotation direction to the work material. It becomes a cutting form that scrapes off. Therefore, in the throw-away type cutting tool having the above structure, the cutting edge 20
It is possible to prevent an impact load from being applied to the cutting edge, and in combination with the high tip rigidity described above, it becomes possible to more reliably prevent the cutting edge 20 from being damaged.

Moreover, in this embodiment, the deburring chip 14 is a positive chip, and the chip body 1
The circumferential surface 19c, which is the rake face of 9, is formed into a conical surface shape. Therefore, it is measured along the actual cutting edge angle of the cutting edge 20, that is, the tool rotating direction in which the cutting load acts on the cutting edge 20. The cutting edge 20 has a cutting edge angle of 2
0 is the largest in the part located on the tool rotation direction side,
It becomes smaller as it goes away from this portion and goes rearward in the tool rotation direction along the cutting edge 20. Therefore, in the cutting edge 20 of the deburring tip 14, a higher cutting edge strength is given to the portion that first bites into the work material, which also effectively prevents the cutting edge 20 from being damaged. You get the advantage of being able to.

In addition to these, in the present embodiment, the deburring tip 14 is a positive tip, and the cutting edge 20 used for cutting is provided with a positive rake angle β, whereby the cutting edge 20 is provided. It is possible to give sharp sharpness to. That is, the burr that the deburring tip 14 is trying to remove is a small thin projection left uncut on the processing surface by cutting with the cutting edge 16 of the main tip 15, and therefore the rake angle of the cutting edge 20 is negative. If it is a corner, there is a possibility that it may not be removed cleanly because it has a cutting form that crushes the burr rather than scraping it off. However, in this embodiment, since the cutting edge 20 is provided with a positive rake angle β and a sharp cutting edge is secured,
The burr can be surely scraped and removed, and the smooth processed surface as described above can be obtained.

In this embodiment, one side surface 19a of the deburring tip 14 facing the tool tip side and serving as a flank is inclined toward the rear end side in the axis O direction toward the rear side in the tool rotation direction. The cutting edge 20 used for cutting the deburring tip 14 is set to have a clearance angle α of 4 °. However, if the clearance angle α is too small, the one side surface 19a is formed. In addition, it is not preferable because a sufficient relief amount cannot be secured, which promotes the progress of flank wear and shortens the chip life. On the other hand, on the contrary, if the clearance angle α is too large, the cutting edge 2 is viewed from the tool rotation direction side.
The radius of curvature of the ellipse bulging toward the tool tip side formed by 0 becomes small, and unless the feed of the tool main body 11 is reduced, a smooth machined surface may not be obtained, which is also not preferable. Therefore, this deburring tip 14
It is desirable that the clearance angle α given to the one side surface 19a which is the clearance surface is set to 4 to 15 ° as described above.

If the size of the circular chip used as the deburring chip 14 is too large, the tool body 11
Depending on the size of the tool, there is a risk of interference with other main chips 15 adjacent in the tool circumferential direction, and in order to avoid such interference, it is necessary to increase the distance between the two chips 14, 15. However, before and after the deburring tip 14, the feed amount of the main tip 15 per blade fluctuates greatly, which may rather form a feed mark, which is not preferable. On the other hand, conversely, if the deburring tip 14 is too small,
The radius R of the one side surface 19a, which is the flank, that is, the radius of the circumferential cutting edge 20 is also reduced, whereby the elliptical shape of the cutting edge 20 as viewed from the tool rotation direction side is formed as in the case described above. Since the radius of curvature becomes small, a smooth machined surface may not be obtained, which is also undesirable. Further, when the size of the deburring tip 14 becomes smaller, the cutting edge 20 becomes shorter without being removed again, which may make it difficult to increase the number of times the cutting edge 20 can be used in one tip. Therefore, the size of the deburring tip 14 has a radius R of the one side surface 19a as described above.
Is preferably set to a size of about 3 to 15 mm.

Further, in this embodiment, the cutting edge 20 of the deburring tip 14 is arranged so as to project toward the tool tip side with respect to the cutting edge 16 of the main tip 15, and the projection amount δ is 0.1 mm.
However, if the protrusion amount δ is too large, the amount of cutting by the cutting edge 20 of the deburring tip 14 becomes too large, the load acting on the cutting edge 20 becomes excessive, and conversely the protrusion amount δ is too small. Then, the portion of the cutting blade 20 used for cutting becomes extremely small, and although the number of times the cutting blade can be used increases, there is a possibility that a smooth machined surface cannot be obtained. Therefore, this protrusion amount δ is also 0.01 as described above.
It is desirable to set in the range of up to 0.3 mm.

On the other hand, in this embodiment, the deburring tip 14 is used.
Although various effects as described above have been obtained as a circular tip, the cutting edge is not limited to such a circular tip, and a cutting edge is formed at the intersection ridge of the side surface of the polygonal shape and the peripheral surface around it. Using a flat-shaped chip as a deburring chip, and facing a tool rotation direction side with a part of this peripheral surface as a rake surface, and facing the tool tip side with the side surface as a flank surface,
A so-called vertical blade may be attached to the tool main body 11, and the cutting edge at the ridgeline intersecting with a part of the peripheral surface and the side surface may be a deburring blade or a flat blade. However, even with such a throw-away type cutting tool, the width direction of the side surface of the insert body, which is thicker in the deburring insert, matches the direction in which the cutting load acts on the cutting edge. It is possible to secure high chip rigidity in the cutting tip and prevent the cutting edge from being damaged or the deburring tip to be damaged. If a regular polygonal plate-shaped chip is used as such a deburring chip, the cutting edge can be used four times for a square-shaped chip and three times for an equilateral triangular plate-shaped chip, for example. Therefore, even with such a deburring tip, the number of times the cutting edge can be used is increased and effective use of the tip material is possible, compared to a conventional deburring tip that can only reuse the cutting edge once or twice. It is possible to improve economic efficiency.

[0032]

As described above, according to the present invention,
A flat chip having a cutting edge formed at the ridge line intersecting at least one side surface and at least a part of the peripheral surface is used as a deburring chip, and the deburring chip scoops a part of the peripheral surface. By facing the tool rotation direction side as a surface and mounting the above one side surface as a clearance surface toward the tool tip side on the tool body, high chip rigidity is secured and chipping of the cutting edge and damage of the chip are prevented. It becomes possible to do. Then, by using a circular tip as the deburring tip, by appropriately rotating the circular tip and using an unused cutting edge, it is possible to increase the number of times the cutting edge can be used in one tip. In addition to providing an economically efficient throw-away type cutting tool by effectively utilizing the insert material, the cutting edge is gradually given by the arcuate cutting edge, so that the cutting edge is not subject to a shocking load. It is possible to prevent this from acting, and in combination with ensuring a high chip rigidity, it is possible to effectively prevent the cutting edge from being damaged or the like.

[Brief description of drawings]

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

FIG. 2 is a bottom view of the embodiment shown in FIG. 1 as viewed in the X direction.

FIG. 3 is a side view of the embodiment shown in FIG. 1 as viewed in the Y direction.

FIG. 4 is a bottom view seen in the Z direction (direction orthogonal to the side surface 19a) in FIG.

FIG. 5 is a diagram showing the rotation loci of the cutting edge 16 and the cutting edge 20 around the axis O in the embodiment shown in FIG.

FIG. 6 is a cross-sectional view showing a conventional throw-away type rolling tool with a flat blade.

FIG. 7 is a bottom view of the conventional example shown in FIG.

[Explanation of symbols]

11 Tool Main Body 13A, 13B Tip Mounting Seat 14 Deburring Tip 15 Main Tip 16 Cutting Edge of Main Tip 19 Deburring Tip 14 Tip Body 19a Side Side for Deburring Tip 14 19c Deburring Tip Circumferential surface to be the rake face of 14 20 Cutting edge of deburring tip 14 Clearance angle of cutting edge 20 Rake angle of cutting edge R Radius of side surface 19a δ Tool tip side of cutting edge 20 with respect to cutting edge 16 Amount of protrusion to

Claims (5)

[Claims] 1. A throw in which a plurality of tip mounting seats are formed on the outer periphery of the tip end portion of a tool body rotated about an axis, and throw-away tips equipped with cutting blades are detachably mounted on these tip mounting seats. In away type rolling tools,
At least one of the throw-away chips is a deburring chip in which the cutting edge is formed at the ridge line portion intersecting at least one side surface and at least a part of the peripheral surface of the flat plate-shaped chip body. The deburring tip is a throw-away type characterized in that a part of the peripheral surface is directed toward the tool rotation direction side as a rake surface, and the one side surface is mounted toward the tool tip side as a flank surface. Rolling tool. 2. The deburring tip is a positive throw-away tip in which a part of the peripheral surface which is a rake surface and the at least one side surface which is a flank intersect at an acute angle through the cutting edge. The throw-away type rolling tool according to claim 1, wherein 3. The deburring tip, wherein the side surface of the tip body is formed in a circular shape and the peripheral surface is a circumferential surface, and a circumferential intersection ridgeline between these side surfaces and the circumferential surface. The throw-away type milling tool according to claim 1 or 2, which is a circular insert having the cutting edge formed on a portion thereof. 4. The throw-away type rolling tool according to claim 3, wherein a clearance angle of the one side surface which is a clearance surface of the circular insert is set to 4 to 15 °. 5. The throw-away type rolling tool according to claim 3 or 4, wherein a radius of the one side surface, which is a flank of the circular insert, is set to 3 to 15 mm. .