JP2002144130A - Throwaway type cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To finish a machined surface of a material to be cut with good accuracy. SOLUTION: A hole part 18 is provided extending from the outer peripheral cutting edge tip from the inner peripheral side in the radial direction of a cutter body in the tip surface 10A of the cutter body 10, a seat member 21 and a tip mounting seat 24 are supported on the cutter body 10 to be rotatable around the center axis R in the hole part 18, and a disk-like tip 17 is mounted on the tip mounting seat 24 by a clamp screw 25. A part of the cutting edge 17C of the disk-like tip 17 that is positioned most on the cutter body tip side is projected toward the tip of the cutter body more than a front cutting edge of the outer peripheral cutting edge tip.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a disk-shaped throw-away tip attached to a tip end surface of a cutter body,
The present invention relates to a throw-away type cutter used for surface finishing.

[0002]

2. Description of the Related Art Conventionally, a throw-away type cutter is provided with a tip mounting seat which is oriented in the direction of cutter rotation at an outer peripheral portion of a tip end of a cutter body, and the main cutting blade of the throw-away tip is provided on the tip mounting seat as an outer peripheral blade. A sub-cutting blade that projects outward from the outer peripheral surface of the main body, is arranged at a corner angle, and is connected to this outer peripheral blade and located on the distal end side of the cutter main body as a front blade, rotates the cutter on the distal end side in the cutter rotation axis direction from the front end surface of the cutter body. What is provided so that it may be located on a plane orthogonal to an axis is known. Such throw-away type cutters are provided with a lateral feed while being rotated around the cutter rotation axis, perform rough cutting of a work material by an outer peripheral blade, and perform finish cutting of a processed surface by a front blade. However, the width of this front blade cannot be made large due to the relationship with the cutting resistance, and when the traverse per rotation is large, uncut parts will be left, and the front blade will be a plane perpendicular to the cutter rotation axis. There is a problem that the accuracy of the machined surface of the work material is deteriorated if it is not accurately positioned above. Therefore, by attaching a disc-shaped throw-away tip (hereinafter referred to as a disc-shaped tip) as a vertical blade to the tip end surface of the cutter body for finishing cutting, an arc-shaped cutting blade in a side view is cut. There is a throw-away type cutter which performs surface finishing of a material to improve the finish roughness of a processed surface, and there are known cutters as shown in FIGS. In such a throw-away type cutter, a substantially cylindrical cutter body 1 that is rotated about an axis O in a rotation direction T is provided with a throw-away tip 3 (hereinafter referred to as an outer peripheral tip) having an outer peripheral edge at an outer peripheral end portion thereof. A plurality of grooves 2 are formed at predetermined intervals, and a disc-shaped chip 6 is mounted on the distal end surface 1A of the cutter body 1 on the radially inner side of the cutter body than the grooves 2. Recesses 5 are formed at one or more locations.

[0003] The outer peripheral blade tip 3 mounted in the groove 2 is
It has a substantially rectangular flat plate shape, and one of the rectangular surfaces is a lower surface forming a seating surface, and an upper surface 3A facing the lower surface is a rake surface, and four main cutting edges are formed at a side edge of the upper surface 3A. Further, four sub cutting edges are formed at the intersections of the main cutting edges. The outer peripheral edge tip 3 has its upper face 3A, which is a rake face, oriented in the rotation direction T, and one of the main cutting edges of the outer peripheral edge tip 3 projects outward from the outer peripheral surface of the cutter body as an outer peripheral edge 3B and is arranged with a corner angle. The auxiliary cutting edge, which is connected to the outer peripheral blade 3B and located on the distal end side of the cutter body, is located on a plane orthogonal to the cutter rotation axis O as the front blade 3C, and is directed toward the distal end side of the cutter body.
It is detachably attached by a wedge member 4 or the like.

The disk-shaped chip 6 mounted in the concave portion 5 has a circumferential cutting edge 6B formed at a side edge of an upper surface 6A facing a lower surface serving as a seating surface. It is formed on a positive chip that is inclined outward from the lower surface toward the upper surface 6A. This disk-shaped chip 6
Is fixed to the recess 5 with a clamp screw 7 or the like as a vertical blade whose upper surface 6A faces the tip end side of the cutter body and whose side facing the front side in the cutter rotation direction T is a rake face. At this time, as shown in FIG. 12, the center axis P of the disk-shaped chip 6 is
(A straight line O ′ parallel to the cutter rotation axis O) is inclined to the rear side in the cutter rotation direction T by θ (for example, 0.5 ° to 5 °), and the cutter body rotation direction among the cutting edges 6B of the disc-shaped tip 6 The portion located on the front side of T is used for cutting the work material.

At this time, the rotation trajectory of the disk-shaped tip 6 and the outer peripheral edge tip 3 around the cutter rotation axis O is as shown in FIG. 13 and is located at the most distal end side of the cutting edge 6B of the disk-shaped tip 6. Is protruded from the front edge 3C of the outer peripheral edge tip 3 by a at the tip end side of the cutter body (for example, 0.05 to
0.2 mm).

In the throw-away type cutter having the disk-shaped tip 6 mounted as described above, the disk-shaped tip 6 performs cutting immediately after the outer peripheral edge tip 3 with the lateral feed of the cutter body 1. Will be. Therefore, the rough cutting of the workpiece is performed by the outer peripheral blade 3B of the outer peripheral tip 3, and the rough finishing of the surface of the workpiece is performed by the front blade 3C of the outer peripheral tip 3. The precision finishing is performed by the cutting edge 6 </ b> B of the chip 6, and a smooth finished surface can be obtained.

[0007]

However, as described above, in the disk-shaped tip 6 which is fixed to the distal end surface 1A of the cutter body 1 by the clamp screw 7 or the like and does not move, the cutting material 6B is cut by the cutting edge 6B. The wear of only the portion provided for the work has an adverse effect on the surface accuracy of the machined surface of the work material. When the sharpness of the cutting edge 6B of the disk-shaped tip 6 is reduced, the unused cutting edge 6B is replaced with the front blade 3.
There is a problem that it is necessary to make a corner change so as to protrude from the tip of the cutter body toward the tip end side of the cutter and to provide the cutting position, which is complicated.

The present invention has been made in view of the above problems, and has as its object to provide a throw-away type cutter capable of finishing a finished surface of a workpiece with high accuracy.

[0009]

Means for Solving the Problems To solve the above problems,
In order to achieve such an object, the present invention provides a cutter body which is rotated around an axis, and a tip mounting seat facing a cutter body tip side is formed on a tip face of the cutter body. The clamp tip is mounted on the tip mounting seat so as to protrude further toward the tip end side of the cutter body, and the disc-shaped tip is rotatable with respect to the cutter body around its central axis. With such a configuration, the disk-shaped chip itself is rotated around its central axis by the cutting resistance when the surface of the workpiece is finished by the cutting edge of the disk-shaped chip. Accordingly, the workpiece is cut while using the entire cutting edge having a circular shape while rotating the disk-shaped tip, thereby extending the life of the disk-shaped tip. In addition, it is possible to suppress wear of a part of the cutting edge and a decrease in processing accuracy due to this, and when only a specific part of the fixed cutting edge is used for cutting as in the past and the sharpness is reduced, a corner change is performed. There is no need to do.

[0010] The tip mounting seat is provided at a tip of a sheet member rotatable with respect to the cutter body.
The disk-shaped tip rotates following the tip mounting seat and the seat member. With such a configuration, the disk-shaped chip is driven to rotate with the chip mounting seat and the sheet member on which the disk-shaped chip is mounted, so that the disk-shaped chip can be more stably rotated.

Further, the outer peripheral edge tip is mounted on the outer peripheral portion of the tip end of the cutter body. With such a configuration, it is possible to perform rough cutting of the work material by the outer peripheral blade of the outer peripheral edge tip, and to perform finish cutting of the work material by the cutting edge of the disk-shaped tip. Also,
The cutting edge of the disc-shaped tip is located closer to the front end of the cutter body than the front edge of the outer peripheral tip.
With such a configuration, the rough cutting of the work material and the rough finish cutting of the work material by the front blade are performed by the outer blade of the outer blade tip, and the precision finish cutting is performed by the cutting blade of the disk-shaped chip. And two-stage finishing.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The cutter body 10 of the indexable cutter according to the present embodiment is shown in FIGS.
Is a substantially cylindrical member that is rotated in the rotation direction T about the axis O, and has a cutter rotation axis O
A mounting hole 11 for mounting the cutter body 10 to a spindle end of a machine tool or the like is formed through the cutter body 10 along the periphery of the opening periphery of the mounting hole 11 on the cutter body base end side. Are key grooves 11 along the diametric direction of the cutter body 10.
A is formed.

Also, on the outer periphery of the tip of the cutter body 10,
As shown in FIGS. 2 to 5, a plurality of grooves 12 for mounting the outer peripheral cutting tip 13 are formed at predetermined intervals.
Each of the grooves 12 is open at the front end side of the cutter body. Further, a tip mounting seat is provided such that the rear side of the groove 12 in the cutter rotation direction T is further retracted one step backward, and the chip mounting seat is provided with a chip mounting seat bottom surface 12A facing the front side of the cutter rotation direction T and a chip mounting seat. It is formed from two chip mounting seat wall surfaces 12B, 12B for chip positioning that rise from the bottom surface 12A and face the tip end side of the cutter body.
Further, a hole 18 for mounting a disc-shaped chip 17 on the inner peripheral side of the cutter body radial direction with respect to the groove 12 is formed on the tip end surface 10A of the cutter body 10 through the cutter body 10 and inclined with the axis O. It is formed at one or more locations in the direction.

Outer peripheral cutting tip 13 mounted in the groove 12
Has a substantially rectangular flat plate shape, and one of the rectangular surfaces is a lower surface 13B serving as a seating surface, an upper surface 13A facing the lower surface 13B is a rake surface, and four main cuts are formed at a side edge of the upper surface 13A. A blade is formed, and four sub-cutting edges are formed at a portion where four main cutting edges intersect. Further, a positive chip whose side surface inclines outwardly from the lower surface 13B toward the upper surface 13A.

As shown in FIGS. 3 to 5, the outer peripheral edge tip 13 has a lower surface 13B having a tip mounting seat bottom surface 12A.
And the tip mounting seat bottom surface 12 by the clamp screw 14A.
After the sheet 14 in the form of a substantially rectangular flat plate fixed to the inside is interposed therebetween, and the side surface of the outer peripheral tip 13 is further adhered to the chip mounting seat wall surfaces 12B, 12B,
The wedge member 15 inserted into the groove 12 is
The upper surface 13A of the outer peripheral blade tip 13 is pressed and fixed to the rear side in the cutter rotation direction T by being tightened. At this time, one of the main cutting edges of the outer peripheral edge tip 13 projects outward from the outer peripheral surface of the cutter body as an outer peripheral edge 13C, is arranged at a corner angle, and is connected to the outer peripheral edge 13C and located at the tip side of the cutter main body. Blade is front blade 1
As a 3D, the cutter body is positioned on a plane perpendicular to the cutter rotation axis O on the tip side in the cutter rotation axis O direction from the front end face of the cutter body.

Further, as shown in FIG. 6, a tip portion (lower portion shown in FIG. 6) 19 is formed in a hole 18 formed through the cutter body 10 from the tip end face 10A of the cutter body 10.
A bearing member 19 formed into a flange shape whose A is one step larger in diameter than the cylindrical body portion 19B is fitted and fixed. Further, the radial bearing 2 is provided on the inner periphery of the bearing member 19.
0, a substantially cylindrical sheet member 21 whose front end portion 21A (the lower side portion in FIG. 6) is enlarged by one step is attached by inserting the cylindrical shaft portion 21B, and the bearing member 19 is mounted. A thrust bearing 2 is provided between the upper surface of the distal end portion 19A and the lower surface of the distal end portion 21A of the sheet member 21.
2 ... are interposed. Further, a male screw portion 21C is formed at a rear end portion of the sheet member 21, and a disk-shaped receiving plate 23 having a female screw portion 23A screwed to the male screw portion 21C is formed into a male screw portion of the sheet member 21. 21C and screwed onto the receiving plate 23.
By interposing a thrust bearing 26 on the upper side (lower side in FIG. 6), the seat member 21
, 22,..., 26, the central axis R
It is rotatably supported around.

As shown in FIG. 6, a peripheral wall portion 21D is formed on the upper surface of the front end portion 21A of the sheet member 21 so as to orbit around the periphery along the center axis R. The tip mounting seat 24 has an annular shape. The upper surface of the tip portion 21A of the seat member 21 becomes the chip mounting seat bottom surface 24A, and the inner peripheral surface of the peripheral wall portion 21D becomes the chip mounting seat wall surface 24B. Are formed so as to face the front end side of the cutter body. A mounting screw hole 24C is formed in the center of the chip mounting seat bottom surface 24A along the central axis R.

The disc-shaped tip 17 mounted on the tip mounting seat 24 is formed of a hard material such as a cemented carbide, for example, and has a substantially disc shape, as shown in FIG. A lower surface 17B and a circular upper surface 1 facing the lower surface 17B.
7A are formed, and a circumferential cutting edge 17C is formed at a side edge of the upper surface 17A. In addition, the disk-shaped chip 1
The side surface 17D of 7 is formed in a tapered shape that inclines outward from the lower surface 17B toward the upper surface 17A. In the center of the tip 17, a clamp hole 17E through which a clamp screw 25 as a clamp means in the present embodiment passes is provided along the central axis Q.

Disc-shaped chip 1 constructed as described above
7 is set on the chip mounting seat 24, and is tightened by a clamp screw 25 screwed into a mounting screw hole 24C formed in the chip mounting seat bottom surface 24A, thereby pressing the chip mounting seat wall surface 24B to the outer peripheral side to thereby insert the chip. Upon receiving a force from the mounting seat wall surface 24B toward the central axis Q of the disk-shaped chip 17, the centering is performed so that the central axis Q of the disk-shaped chip 17 coincides with the central axis R of the chip mounting seat 24 and the seat member 21. Is performed and mounted. Here, the disk-shaped chip 17 is driven and rotated together with the sheet member 21 rotatable around the central axis R and the chip mounting seat 24 formed at the tip end of the sheet member 21, thereby rotating the disk-shaped chip 17. Are also rotatable about a central axis Q.

The disk-shaped chip 17 has a side surface 17.
D is attached as a vertical blade that is a rake face,
Further, the disc-shaped tip 17 is mounted to be inclined with respect to the cutter body 10, and the tip end side of the center axis Q of the disc-shaped tip 17 is parallel to the cutter rotation axis O (parallel to the cutter rotation axis O). With respect to the straight line O ′), as shown in FIG. 7, it is inclined θ1 (for example, 0.5 ° to 5 °) rearward in the cutter body rotation direction T, and as shown in FIG.
Θ2 (for example, 0.1 ° to 5 °)
゜) It is mounted so that it tilts. The angle θ1 at which the disc-shaped tip 17 is inclined rearward in the cutter rotation direction T determines the shape of the cutting blade 17C in a side view of the cutter body 10, and determines the flank of the disc-shaped tip 17 as the upper surface 17 thereof.
A angle θ2 at which the clearance angle of A is determined, and the center axis Q of the disc-shaped tip 17 is inclined toward the radially inner side of the cutter body.
Is determined by the relationship between the rotation speed of the cutter body 10 and the rotation speed of the disc-shaped tip 17, and these angles θ1 and θ2 are appropriately set within the above-described range.

At this time, the positional relationship between the disk-shaped tip 17 and the outer peripheral edge tip 13 is shown in FIG. Is located on the inner peripheral side of the cutter body radial direction with respect to the outer peripheral tip 13, and the portion of the cutting edge 17 </ b> C of the disc-shaped tip 17 located on the distal end side of the cutter main body is more than the front blade 13 </ b> D of the outer peripheral tip 13. B on the tip side of the cutter body
(For example, 0.05 to 0.2 mm), and the surface finish of the work material is performed at a portion protruding from the front blade 13D of the arc-shaped cutting blade 17C toward the tip end of the cutter body.

In the throw-away type cutter having the above-described configuration, the cutter body 10 is rotated around the cutter rotation axis O, and is fed laterally in a direction orthogonal to the direction of the cutter rotation axis O. The material is cut. At this time, the outer peripheral edge 13 of the outer peripheral edge tip 13
C and rough cutting of the work material
Rough finish cutting of the work surface of the work material is performed by the front blade 13D, and furthermore, it is positioned closer to the inner side of the cutter body than the outer blade tip 13 and further protrudes to the front end side of the cutter body than the front blade 13D. While the disk-shaped chip 17 mounted on the chip mounting seat 24 is driven to rotate integrally with the sheet member 21 and the chip mounting seat 24 around the central axis Q by the cutting resistance, further precise finish cutting of the processing surface of the work material is performed. Is performed.

In the indexable cutter according to the present embodiment having the above-described configuration, the disc-shaped tip 17 is rotatable about the central axis Q together with the sheet member 21 and the tip mounting seat 24. Since the disk-shaped tip 17 is driven and rotated around the central axis Q by the cutting resistance of the workpiece, the workpiece is cut, and the entire cutting edge 17C having a circumferential shape is subjected to the cutting. The life of the disk-shaped tip 17 can be extended. Further, it is possible to suppress abrasion of a part of the cutting edge 17C and a decrease in machining accuracy due to the wear, and a corner change is performed by performing a corner change when the sharpness of a specific part of the fixed cutting edge is reduced as in the related art. There is no need to set an uncut cutting blade at the cutting position, and the working time can be reduced. In addition, since the portion of the cutting edge 17C of the disc-shaped tip 17 located closest to the tip of the cutter body is located closer to the tip of the cutter body than the front blade 13D of the outer edge tip 13, the outer edge tip 13 The rough cutting of the work material is performed by the outer peripheral blade 13C and the rough finish cutting of the work material is performed by the front blade 13D.
Since precision finish cutting can be performed at 7C and two-stage finish processing can be performed, the surface of the work material can be finished more precisely.

In this embodiment, the wedge member 15 is used as a means for fixing the outer peripheral tip 13 to the groove 12, but the present invention is not limited to this. May be fixed. Further, in the present embodiment, the outer peripheral blade tip 13 is formed such that the upper surface 13A is a rake face toward the front side in the rotation direction T of the cutter body. However, the present invention is not limited to this. A vertical blade may be formed such that the side surface of the outer peripheral edge tip 13 is a rake face with the upper surface 13A facing the front end side of the cutter body. Further, in the present embodiment, the disc-shaped tip 1 is attached to the distal end face 10A of the cutter body 10.
7 is provided, and an outer peripheral edge tip 13 is provided to perform rough cutting and finish cutting of a work material at the same time. However, the present invention is not limited to this. In the away type cutter, the outer peripheral blade tip 13 may not be provided.

[0025]

According to the present invention, since the disk-shaped chip mounted on the tip end face of the cutter body is rotatable with respect to the cutter body about its central axis, the cutting of the disk-shaped chip is performed. The entire cutting edge that forms a circular shape by cutting the work material while the disk-shaped tip itself is driven and rotated around its central axis by the cutting resistance when the surface finish processing of the work material is performed by the blade Is used for cutting, so that the life of the disc-shaped tip can be extended. In addition, it is possible to suppress wear of only a part of the cutting blade and a decrease in processing accuracy due to this,
As in the conventional case, when only a specific portion of the fixed cutting blade is used for cutting and the sharpness is reduced, it is not necessary to perform a corner change, and the working time can be reduced.

The tip mounting seat is provided at the tip of a sheet member rotatable with respect to the cutter body, and the disc-shaped tip is driven by the tip mounting seat and the seat member to which the disc-shaped tip is fixed. By doing so, the disk-shaped tip can be rotated more stably. In addition, since the outer peripheral tip is mounted on the outer peripheral portion of the tip end of the cutter body, rough cutting of the work material can be performed by the outer peripheral blade of the outer peripheral tip, and cutting of the disc-shaped tip can be performed. Finish cutting of the work material can be performed by the blade. Further, since the cutting edge of the disc-shaped tip is located closer to the front end of the cutter body than the front edge of the outer peripheral tip, the rough cutting of the work material is performed by the front edge of the outer peripheral tip. , Precision finishing with the cutting edge of the disc-shaped tip
It is possible to finish the processing surface of the work material with higher accuracy.

[Brief description of the drawings]

FIG. 1 is a center line cross-sectional view of a throw-away type cutter according to an embodiment.

FIG. 2 is a plan view of the throw-away type cutter according to the embodiment.

FIG. 3 is an enlarged plan view of a main part in FIG. 2;

FIG. 4 is a side view of the vicinity of a peripheral cutting edge of the indexable cutter according to the embodiment.

FIG. 5 is a plan view showing the vicinity of an outer peripheral edge tip of the throw-away type cutter according to the present embodiment.

FIG. 6 is a sectional view taken along line BB in FIG. 3;

FIG. 7 is a cross-sectional view of the disc-shaped tip of the throw-away type cutter according to the present embodiment as viewed from the radially inner side of the cutter body.

FIG. 8 is a cross-sectional view of the disc-shaped tip of the throw-away type cutter according to the present embodiment as viewed from the front side in the cutter rotation direction.

FIG. 9 is a diagram showing the rotation trajectory of the disk-shaped tip and the outer peripheral edge tip around the cutter rotation axis according to the present embodiment as viewed from the front side in the rotation direction.

FIG. 10 is a sectional view of a conventional indexable cutter.

FIG. 11 is a plan view of a conventional throw-away type cutter.

FIG. 12 is a sectional view taken along line AA in FIG. 11;

FIG. 13 is a diagram showing a rotation trajectory of a conventional disk-shaped tip and an outer peripheral edge tip around a cutter rotation axis as viewed from the front side in the cutter rotation direction.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Cutter body 11 Mounting hole 12 Groove 13 Peripheral blade tip 15 Wedge member 17 Disc-shaped tip 18 Hole 21 Sheet member 24 Tip mounting seat

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Tomoyoshi Sakamoto 1511 Furamaki, Ishishita-cho, Yuki-gun, Ibaraki Prefecture Inside the Tsukuba Works, Mitsubishi Materials Corporation (72) Inventor Norio Aso, 1511 Furimagi, Ishishita-cho, Yuki-gun, Ibaraki Prefecture Mitsubishi Materials Corporation Tsukuba Factory F-term (reference) 3C022 HH01 HH05 HH08 MM04 MM06

Claims (4)

[Claims] 1. A tip mounting seat is formed on a distal end surface of a cutter main body that is rotated around an axis, the tip mounting seat facing the distal end side of the cutter main body, and a disc-shaped throw-away tip is closer to the distal end surface of the cutter main body than the distal end surface of the cutter main body. The disc-shaped throw-away tip is attached to the tip mounting seat by clamping means so as to protrude therefrom, and the disc-shaped throw-away tip is rotatable with respect to the cutter body around its central axis. Cutter. 2. The throw-away cutter according to claim 1, wherein the tip mounting seat is provided at an end of a sheet member rotatable with respect to the cutter body. A throw-away cutter, which is driven to rotate with the tip mounting seat and the seat member. 3. The throw-away cutter according to claim 1, wherein another throw-away tip having an outer peripheral edge is attached to an outer peripheral portion of a tip end of the cutter body. Cutter. 4. The throw-away cutter according to claim 3, wherein the cutting edge of the disc-shaped throw-away tip is closer to the tip of the cutter body than the front blade of another throw-away tip having the outer peripheral edge. A throwaway cutter characterized by being located.