JP5305108B2 - Rotating tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotating tool performing V groove working and end surface cutting of a substrate in one step while suppressing the occurrence of burr. <P>SOLUTION: The rotating tool is configured in such a way that: serration-shaped blade bases 13 are formed in a circumferential direction at a prescribed pitch on an outer periphery of a disk-like base metal 12; each of the blade bases 13 is formed in reverse V shape in front view and a placing part 14 is formed on each of rotation-direction surface sides of the blade bases 13; and a tip 11 of reverse V-shape in front view is fixed to each placing part 14. The reverse V-shaped tip 11 comprises a first reverse V-shaped tip 11a having a lead angle &delta; on one inclined blade 17a side and a second reverse V-shaped tip 11b having a lead angle &delta; on the other inclined blade 18a side, In the first reverse V-shaped tip 11a, an inclined angle K2 of the other angle flank blade 17b relative to a center line Y is made smaller than an inclined angle K1 of the one inclined blade 17a. The second reverse V-shaped tip 11b is formed bilaterally-symmetric in front view with the first reverse V-shaped tip 11a with respect to the center line Y, and the first and second reverse V-shaped tips 11a and 11b are alternately disposed in the circumferential direction. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

  The present invention relates to a rotary tool used for forming a V-shaped groove on a printed board, an aluminum board, a copper board, or the like or cutting an end face of the board.

  Conventionally, a diamond tip saw that is used when a V-shaped cut is made in a workpiece such as a printed circuit board is known. As shown in FIG. 18, the tip saw 1 has a chip fixing recess 3 provided on the outer peripheral edge of the circular saw substrate 2 and a chip 4 V-cut at an angle a = 30 degrees as shown in FIG. The chip 4 is fixed so that the diamond layer 5 is located on the entire surface of the chip 4 on the rake face 6 side.

When such a diamond tip saw 1 is used to process a V-groove on a printed circuit board or the like, burrs are likely to occur at the corners where the V-cut is performed. For this reason, a diamond tip saw that hardly generates burrs is desired. When burrs are generated, a process of removing the burrs by chamfering the corners is necessary.
Also, when cutting the end face of a printed circuit board or the like, the end face is V-cut using the same diamond tip saw 1, but burrs are likely to occur at the V-cut corner as in the V-groove processing, and the corner is chamfered. A process for removing burrs by processing is required.

  JP 2008-264950 A

  Accordingly, an object of the present invention is to provide a rotary tool that enables V-groove processing and end face cutting of a substrate in one step while suppressing the generation of burrs.

In order to solve the above-mentioned problems, a rotary tool according to the present invention has a saw-toothed blade base formed at a predetermined pitch in the circumferential direction on the outer periphery of a disk-shaped rotating body, and the blade base is formed in a reverse V shape when viewed from the front. In addition, a mounting portion that is cut out in an L shape in side view is formed on the rotational direction surface side of the blade base, and the polycrystalline diamond layer is integrally formed on the mounting portion on the front side of the cemented carbide layer. A rotary tool formed by fixing a shaped tip, wherein the inverted V-shaped tip is arranged on the side of the first inverted V-shaped tip having a lead angle on one inclined blade side serving as a dominant blade and the other inclined blade side serving as a dominant blade. The first inverted V-shaped tip has a lead angle, and the first inverted V-shaped tip serves as a dominant blade with the inclination angle of the other inclined relief blade serving as a relief blade with respect to the center line hanging from the tip of the blade edge. It is formed smaller than the angle of inclination of the angled blade and is continuous only to the lower end of one angled blade. A chamfering blade with an increased inclination angle is provided, and the second inverted V-shaped tip has an inclination angle of one inclined relief blade that becomes a relief blade with respect to the center line hanging from the tip of the blade edge, and the other inclination that becomes a dominant blade. The first inverted V-shaped tips and the second inverted V-shaped tips are alternately arranged in the circumferential direction and fixed to the mounting portion.

According to the rotary tool of the present invention , both the first inverted V-shaped tip and the second inverted V-shaped tip are provided with lead angles, and the angle of the inclined relief blade of each inverted V-shaped tip is set to that of the inclined blade that becomes the dominant blade. Since the first inverted V-shaped tips and the second inverted V-shaped tips are alternately arranged in the circumferential direction, the cutting edge is reduced and the substrate is placed on the dominant blade side of one inverted V-shaped tip. It is sharply cut at an acute angle and does not generate burrs. On the escape blade side, the remaining cutting portion has a remaining obtuse angle, so burrs are likely to occur. However, the remaining cutting portion is sharply cut by the dominant blade of the other inverted V-shaped tip, and the burrs are removed. Further, since the first inverted V-shaped tip is provided with a chamfering blade having a continuously increased inclination angle only at the lower end of one of the inclined blades, when cutting the end surface V from both the upper and lower sides, one side (product side) ) Will be cut while chamfering the V-cut corners cut by the chamfering blade. For this reason, burrs do not occur at the V-cut corners.

  It is a side view of the rotary tool by 1st Example of this invention.   It is a front view principal part enlarged view of the inverted V-shaped chip | tip in 1st Example.   It is a plane enlarged view of 1st Example.   It is a side view which shows the use condition of the rotary tool by 1st Example.   FIG. 5 is an enlarged front sectional view of a main part of FIG. 4.   It is a drawing substitute photograph which shows V groove cross section.   It is a side view of the rotary tool by 2nd Example of this invention.   It is a front view principal part enlarged view of the inverted V-shaped chip | tip in 2nd Example.   It is a plane enlarged view of 2nd Example.   It is a side view which shows the use condition of the rotary tool by 2nd Example.   It is principal part expanded front sectional drawing of FIG.   It is a drawing substitute photograph which shows V groove cross section.   It is a drawing substitute photograph which shows the mode of the board | substrate division | segmentation cross section after V-groove processing.   It is a side view of the rotary tool by 3rd Example of this invention.   It is a front view principal part enlarged view of the inverted V-shaped chip | tip in 3rd Example.   It is a side view which shows the use condition of the rotary tool by 3rd Example.   It is principal part expanded front sectional drawing of FIG.   It is a side view of the rotary tool by a prior art example.   It is a front enlarged view of FIG.

  Hereinafter, embodiments for carrying out the present invention will be specifically described with reference to the drawings. As shown in FIGS. 1 and 2, the rotary tool 10 according to the first embodiment of the present invention is a rotary tool having an inverted V-shaped tip 11 (11 a, 11 b), and is a disc-shaped rotary body (base metal). A serrated blade base 13 is formed on the outer periphery of 12 at an equal pitch in the circumferential direction. The blade base 13 is formed in a reverse V shape when viewed from the front, and a mounting portion 14 that is notched in an L shape in a side view is formed on the rotational direction surface side of the blade base 13, and an inverted V-shaped tip is formed on the mounting portion 14. 11 (11a, 11b) is fixed. The inverted V-shaped chip 11 has a polycrystalline diamond layer (PCD layer) 16 on the front side of the cemented carbide layer 15, and the PCD layer 16 faces the rotation direction surface side (rake surface side) on the mounting portion 14. Mount and fix by brazing with silver solder or the like.

The inverted V-shaped tip 11 includes a first inverted V-shaped tip 11a having a lead angle δ on the right inclined blade (one inclined blade) 17a side as a dominant blade and a left inclined blade (the other inclined blade) 18a as a dominant blade. The second inverted V-shaped tips 11b having the lead angle δ on the side are alternately arranged in the circumferential direction and fixed to the blade base 13 of the rotary tool (FIG. 3).
In the first inverted V-shaped tip 11a (FIG. 2 (a)), the inclination angle K2 of the left inclined escape blade (the other inclined escape blade) 17b serving as the escape blade with respect to the center line Y hanging from the tip (upper end) of the blade edge is set. The right inclined blade (one inclined blade) 17a, which is the dominant blade, is formed smaller than the inclination angle K1.
On the other hand, the second inverted V-shaped chip 11b (FIG. 2B) is formed to be symmetrical with the first inverted V-shaped chip 11a with respect to the center line Y in front view. That is, in the second inverted V-shaped tip 11b, the inclination angle K2 of the right inclined relief blade (one inclined relief blade) 18b that becomes the escape blade with respect to the center line Y hanging from the tip (upper end) of the blade edge becomes the dominant blade. It is formed smaller than the inclination angle K1 of the left inclined blade (the other inclined blade) 18a.

Specifically, when the angle of the V groove is 45 °, in the first inverted V-shaped tip 11a, the inclination angle K1 of the right inclined blade 17a serving as the dominant blade is 22.5 ° with respect to the center line Y, and is inclined left. The inclination angle K2 of the escape blade 17b is set to 22 to 14 °. On the other hand, in the second inverted V-shaped tip 11b, the inclination angle K1 of the left inclined blade 18a serving as the dominant blade is 22.5 ° with respect to the center line Y, and the inclination angle K2 of the right inclined escape blade 18b is 22 to 14 °. is there. If the inclination angle K2 of the inclination relief blades 17b and 18b is made smaller than the inclination angle K1 of the inclination blades 17a and 18a, the rigidity is lowered. On the other hand, if the difference is too small, burrs are likely to occur.
The lead angles δ in the first inverted V-shaped chip 11a and the second inverted V-shaped chip 11b are 10 to 20 °, respectively. As an example of other dimensions, the diameter of the rotary tool 10 is 120 mm, the thickness T of the base metal 12 is 2 mm, the number of blades is 6 to 30, the chip width T1 is 1.5 to 2 mm, and the rake angle α is 10. The outer clearance angle is 5 to 10 °, the side clearance angle is 5 to 10 °, and the width B of the end cutting edge is 0.02 to 0.1 mm. In addition, the above-mentioned dimension is an example, and it is needless to say that it can be appropriately changed according to the application.

Conventionally, it can be said that there is no idea of providing a lead in an inverted V-shaped tip in a rotary tool for V-groove machining or V-cut. This is because the tip has an acute angle and the depth of V-groove processing or V-cut is as shallow as about 1.5 mm. Therefore, even if a lead is provided, the effect is small. This is because it is troublesome.
On the other hand, in the present invention, each inverted V-shaped tip is provided with a lead angle, and the inclined relief blade is formed with an inclination angle smaller than that of the inclined blade serving as the dominant blade, and the inverted V-shaped tips are alternately arranged. While reducing the cutting resistance, the substrate is sharply cut without burrs on the dominant blade side of one of the inverted V-shaped tips. Although burrs are likely to occur in the remaining cutting portion on the escape blade side, the remaining cutting portion is sharply cut by the dominant blade of the other inverted V-shaped tip and the burrs are removed, thereby enabling V-groove processing without burrs.

The case where V-groove processing is performed on an aluminum substrate using the rotary tool 10 according to the first embodiment of the present invention will be described. As shown in FIG. 4, the rotary tools 10 and 10 are arranged above and below, the upper rotary tool 10 is rotated to the right and the lower rotary tool 10 is rotated to the left, and the aluminum substrate 19 is sent in the direction of the arrow to the aluminum substrate 19. A groove having a V-shaped cross section (V groove) is formed from above and below.
The V-groove formation process by the rotary tool 10 at this time will be described with reference to FIG. From the state before processing in FIG. 5 (a), as shown in FIG. 5 (b), a V-groove is formed by the right-handed blade (first inverted V-shaped tip 11a) on the lower surface side, while a left-handed surface is formed on the upper surface side. A V-groove is formed by a blade (a right-handed blade (first inverted V-shaped tip 11a) in the front view when the top and bottom are the same).
Next, as shown in FIG. 5C, the left-handed blade (second inverted V-shaped tip 11b) cuts the V-groove cutting remaining portion 20 on the lower surface side, and the right-handed blade (with the upper and lower sides made the same on the upper surface side). When viewed from the front, the cutting remainder 20 of the V-groove is cut by a left-handed blade (second inverted V-shaped tip 11b).
In FIG. 5 (b), the right-handed blade 17a side is sharply cut at an acute angle, so that burrs are not generated and the finish is clean. However, the left relief blade 17b side is obtuse, so burrs are likely to occur. However, in FIG. 6C, the remaining cutting portion 20 is sharply cut by the left-handed blade 18a, so that burrs are removed and the finish is clean.
In this way, as shown in FIG. 4D, the V-groove processing in which the upper and lower V-groove angles K are 45 degrees is completed. For this reason, V-groove processing progresses in one process, and the working efficiency is high.
The photograph in FIG. 6 shows a photograph of a V-groove cross section in which a V-groove process is performed on an aluminum substrate on which an aluminum plate is plated with copper, and it can be seen that no burr is generated at the corner of the V-groove.

  Next, as in the first embodiment, the rotary tool 21 according to the second embodiment of the present invention is a rotary tool having inverted V-shaped tips 22 (22a, 22b) as shown in FIGS. Sawtooth-shaped blade bases 13 are formed on the outer periphery of a disk-shaped rotating body (base metal) 12 at an equal pitch in the circumferential direction. The blade base 13 is formed in a reverse V shape when viewed from the front, and a mounting portion 14 that is notched in an L-shape when viewed from the side is formed on the rotational direction surface side of the blade base 13. 22 (22a, 22b) is fixed. The inverted V-shaped tip 22 has a polycrystalline diamond layer (PCD layer) 16 on the front side of the cemented carbide layer 15, and the PCD layer 16 faces the rotation direction surface side (rake face side) on the mounting portion 14. Mount and fix by brazing with silver solder or the like.

As in the first embodiment, the inverted V-shaped tip 22 has a first inclined V-shaped tip 22a having a lead angle δ on the right inclined blade (one inclined blade) 23a side as a dominant blade and a left inclined blade as a dominant blade. (Second inclined blade) Second inverted V-shaped tips 22b having a lead angle δ on the side of 25a are alternately arranged in the circumferential direction and fixed to the blade base 13 of the rotary tool (FIG. 9).
In the first inverted V-shaped tip 22a (FIG. 8 (a)), the inclination angle K2 of the left inclined escape blade (the other inclined escape blade) 23b that becomes the escape blade with respect to the center line Y hanging from the tip (upper end) of the blade edge is set. The right inclined blade (one inclined blade) 23a, which is the dominant blade, is formed smaller than the inclination angle K1. The height H1 of the right inclined blade 23a and the left inclined escape blade 23b is slightly lower than the depth W1 of the V groove (FIG. 11). Then, chamfering blades 24a and 24b having increased inclination angles K3 and K4 with respect to the center line Y are formed continuously from the lower end of the right inclined blade 23a and the lower end of the left inclined escape blade 23b, respectively. The chamfering blades 24a and 24b start from a height (H1) slightly shallower than the depth W1 of the V-groove so as to chamfer (27) the corner portion where the V-groove has been processed.
On the other hand, the second inverted V-shaped chip 22b (FIG. 8 (b)) is formed symmetrically with the first inverted V-shaped chip 22a in front view with respect to the center line Y. That is, in the second inverted V-shaped tip 22b, the inclination angle K2 of the right inclined relief blade (one inclined relief blade) 25b serving as a relief blade with respect to the center line Y hanging from the tip (upper end) of the blade edge becomes the dominant blade. It is formed smaller than the inclination angle K1 of the left inclined blade (the other inclined blade) 25a. Then, chamfering blades 26a and 26b having increased inclination angles K3 and K4 with respect to the center line Y are formed continuously from the lower end of the left inclined blade 25a and the lower end of the right inclined escape blade 25b, respectively.

  Inclination angle K1 of inclined blades 23a and 25a serving as dominant blades, inclination angle K2 of inclined escape blades 23b and 25b serving as escape blades, lead angle δ, diameter of rotary tool 21, thickness T of base metal 12, number of blades, Specific numerical values such as the chip width T1, the rake angle α, the outer clearance angle, and the side clearance angle are the same as those in the first embodiment. The inclination angles K3, K4 of the chamfering blades 24a, 24b, 26a, 26b are about 40 to 50 °, or about R0.5 to R2.0. In addition, these numerical values are examples, and it is needless to say that they can be appropriately changed according to the application.

The case where V-groove processing is performed on an aluminum substrate using the rotary tool 21 according to the second embodiment of the present invention will be described. As in the first embodiment, as shown in FIG. 10, the rotary tools 21 and 21 are arranged above and below, the upper rotary tool 21 is rotated clockwise, the lower rotary tool 21 is rotated counterclockwise, and the aluminum substrate 19 is moved in the direction of the arrow. Then, a groove having a V-shaped cross section (V groove) is formed on the aluminum substrate 19 from above and below.
The V-groove formation process by the rotary tool 21 at this time will be described with reference to FIG. From the state before processing in FIG. 11A, as shown in FIG. 11B, a V-groove is formed on the lower surface side by a right-handed blade (first inverted V-shaped tip 22a), while a left-handed surface is formed on the upper surface side. A V-groove is formed by a blade (a right-handed blade (first inverted V-shaped tip 22a) in front view with the top and bottom being the same). At the same time as the V-groove is formed, the corners of the V-groove are chamfered by the chamfering blades 24a and 24b.
At this time, the substrate 19 acts so as to be pressed inwardly by the chamfering blades 24a and 24b of the first inverted V-shaped tip 22a (upper side chamfering blade is downward and lower side chamfering blade is upward). The substrate 19 does not shake up and down.
Next, as shown in FIG. 5C, the left-handed blade (second inverted V-shaped tip 22b) cuts the V-groove cutting remainder 20 on the lower surface side, and the right-handed blade (with the upper and lower sides made the same on the upper surface side). When viewed from the front, the remaining cutting portion 20 of the V-groove is cut by a left-handed blade (second inverted V-shaped tip 22b). Also at this time, the substrate 19 is respectively cut by the chamfering blades of the upper and lower second inverted V-shaped tips 22b (the left chamfering blade 26a on the lower surface side, the right chamfering blade on the upper surface side (the left chamfering blade 26a in the front view when the top and bottom are the same)). Since it acts so as to press inward, the substrate 19 does not move up and down.
In FIG. 11B, the right-handed blade side 23a is sharply cut and chamfered (24a) at an acute angle, so that burrs are not generated and the finish is clean, but the left relief blade 23b side is obtuse and therefore burrs are generated. Cheap. However, in FIG. 6C, the remaining cutting portion 20 is sharply cut and chamfered (26a) by the left-handed blade 25a, so that the burrs are removed and the finish is clean.
In this way, as shown in FIG. 4D, the V-groove processing in which the upper and lower V-groove angles K are 45 degrees is completed. Then, the chamfering process is completed simultaneously with the V-groove processing. For this reason, V-groove processing and chamfering progress in one step, and work efficiency is extremely high. At this time, as described above, since the substrate 19 does not move up and down, the remaining thickness S of the substrate 19 after the V-groove processing is constant, and a high-quality processed product is obtained.
The photograph of FIG. 12 shows a photograph of a V-groove cross section obtained by performing V-groove processing on an aluminum substrate with copper plating on an aluminum plate, and there is no burr at the corner of the V-groove, and it is cleanly chamfered by a chamfering blade. I understand that. Moreover, the photograph of FIG. 13 shows the state of the substrate division cross-section after the V-groove processing, and it can be seen that the remaining thickness S is constant with no chamfering by the chamfering blade effect, and the processing surface is also good.

Next, the rotary tool 30 according to the third embodiment of the present invention is suitable for cutting the end face of the substrate, and the basic configuration thereof is the same as that of the first and second embodiments. The rotary tool 30 has a first inverted V-shaped tip 32a having a lead angle δ on the product side inclined blade (one inclined blade) 31a side and a lead angle δ on the end material side inclined blade (other inclined blade) 33a side. The second inverted V-shaped tips 32b are arranged alternately in the circumferential direction and fixed to the blade base 13 of the rotary tool.
In the first inverted V-shaped tip 32a, the inclination angle K2 of the end material-side inclined escape blade (the other inclined escape blade) 31b, which becomes the escape blade with respect to the center line Y hanging from the tip (upper end) of the blade edge, is set to the product-side inclined blade ( One inclined blade) 31a is formed smaller than the inclination angle K1. The height H1 of the product-side inclined blade 31a is formed slightly lower than the depth W1 (FIG. 17) for V-cutting. And the chamfering blade 34a which made the inclination | tilt angle with respect to the centerline Y large continuously was formed in the lower end of the product side inclined blade 31a. The chamfering blade 34a starts from a height H1 slightly shallower than the V-cutting depth W1, and chamfers the corner portion subjected to V-cut processing.
In addition, it is not necessary to provide a chamfering blade on the lower end side of the end material side inclined escape blade 31b. This is because the end material side is discarded and it is not necessary to chamfer. However, in order to maintain the strength of the tip, and in consideration of the processing operation of the tip, a relief 35 having a larger inclination angle is provided at the lower end of the end material side inclined relief blade 31b. In addition, the height of the end material side inclined escape blade 31b is higher than the depth W1 for V-cutting.
On the other hand, in the second inverted V-shaped tip 32b, the inclination angle K2 of the product-side inclined escape blade (one inclined escape blade) 33b serving as an escape blade with respect to the center line Y is set to the end material-side inclined blade (the other inclined blade) 33a. Is formed smaller than the inclination angle K1.
In addition, since the 2nd inverted V-shaped chip | tip 32b does not contribute to chamfering, it is not necessary to provide a chamfering blade. However, in order to maintain the strength of the chip, and in consideration of the chip processing operation, reliefs 35, 35 having larger inclination angles are provided at the lower end of the product-side inclined escape blade 33b and the lower end of the end material-side inclined blade 33a. is there. In addition, the height of the end-material-side inclined blade 33a and the product-side inclined escape blade 33b is higher than the V-cutting depth W1.

Specifically, when the V-cut angle is 35 °, the first inverted V-shaped tip 32a has an inclination angle K1 of the product-side inclined blade 31a to be the dominant blade at 17.5 ° with respect to the center line Y. The inclination angle K2 of the material-side inclined escape blade 31b is set to 17 to 14 °. On the other hand, in the second inverted V-shaped tip 32b, the inclination angle K1 of the end material side inclined blade 33a to be the dominant edge is 17.5 ° with respect to the center line Y, and the inclination angle K2 of the product side inclined relief blade 33b is 17 to 14 °. If the inclination angle K2 of the inclination escape blades 31b and 33b is made smaller than the inclination angle K1 of the inclination blades 31a and 33a, the rigidity is lowered. On the other hand, if the difference is too small, burrs are likely to occur.
The lead angles δ in the first inverted V-shaped chip 32a and the second inverted V-shaped chip 32b are 10 to 20 °, respectively. As an example of other dimensions, the diameter of the rotary tool 30 is 120 mm, the thickness T of the base metal 12 is 2 mm, the number of blades is 6 to 30, the chip width T1 is 1.5 to 2 mm, and the rake angle α is 10. The outer clearance angle is set to 5 to 10 °, and the side clearance angle is set to 5 to 10. The inclination angle of the chamfering blade 34a is about 40 to 50 °, or about R0.5 to R2.0. In addition, the above-mentioned dimension is an example, and it is needless to say that it can be appropriately changed according to the application.

A case where the end face of the printed board is cut using the rotary tool 30 according to the third embodiment will be described. As shown in FIG. 16, the upper and lower rotary tools 30 and 30 ′ are arranged with their positions shifted back and forth (left and right in FIG. 16), the upper rotary tool 30 ′ is rotated counterclockwise and the lower rotary tool 30 is rotated clockwise, The printed circuit board 36 is sent in the direction of the arrow, and the printed circuit board 36 is cut into a V-shaped cross section from above and below. Here, since the first inverted V-shaped tip and the second inverted V-shaped tip in the lower rotating tool 30 are formed symmetrically in front view in the upper rotating tool 30 ', the first' Let us refer to the inverted V-shaped tip and the second 'inverted V-shaped tip.
A V-shaped cut forming process using the rotary tools 30 and 30 'will be described with reference to FIG.
From the state before processing in FIG. 17A, as shown in FIG. 17B, a V-groove is formed on the lower surface side by a right-handed blade (first inverted V-shaped tip 32a). On the other hand, on the upper surface side, a V-groove is formed by a right-handed blade (a left-handed blade (first ′ inverted V-shaped tip 32′a) with the tip end side facing up). At the same time as the V-groove is formed, the V-cut corner is chamfered by the chamfering blades 34a and 34'a.
Next, as shown in FIG. 5C, the remaining cutting portion 20 is cut by the left-handed blade (second inverted V-shaped tip 32b) on the lower surface side, and the left-handed blade (the leading edge side of the blade edge is turned upward) on the upper surface side. The cutting remaining portion 20 is cut by the blade (the second 'inverted V-shaped tip 32'b).
In this way, as shown in FIG. 4D, the V-shaped cutting process in which the upper and lower V-cut angles K are 35 degrees is completed. At the same time as the V-cut processing, the chamfering (27) of the V-cut corner portion on the product side (right side in FIGS. 17B to 17D) is also completed. For this reason, the V-cut process and the chamfering process progress in one process, and the working efficiency is extremely high.
In FIGS. 17B to 17D, the left side portion of the substrate 36 is an end material portion to be discarded, so that chamfering is not necessary.

  In the rotary tool in which the V-cutting tip and the chamfering tip (both tips are not provided with leads), which the inventor has used in the past, are alternately arranged in the circumferential direction, the number of blades is 30. In the present example, the number of blades having the same performance could be reduced to 12. For this reason, the number of expensive diamond tips can be reduced, and the cost can be reduced.

DESCRIPTION OF SYMBOLS 10 Rotating tool 11 Reverse V-shaped chip | tip 11a 1st reverse V-shaped chip | tip 11b 2nd reverse V-shaped chip | tip 12 Base metal 13 Blade base 14 Mounting part 15 Cemented carbide layer 16 Polycrystalline diamond layer (PCD layer)
17a Right inclined blade (one inclined blade)
17b Left inclined relief blade (the other inclined relief blade)
18a Left inclined blade (the other inclined blade)
18b Right angled escape blade (one angled escape blade)
19 Aluminum substrate 20 Cutting remainder 21 Rotating tool 22 Reverse V-shaped tip 22a First inverted V-shaped tip 22b Second inverted V-shaped tip 23a Right inclined blade (one inclined blade)
23b Left inclined relief blade (the other inclined relief blade)
24a, 24b Chamfering blade 25a Left inclined blade (the other inclined blade)
25b Right-side inclined relief blade (one inclined-relief blade)
26a, 26b Chamfering blade 27 Chamfered portion 30, 30 ′ Rotating tool 31a, 31′a Product side inclined blade (one inclined blade)
31b, 31'b End material side inclined relief blade (the other inclined relief blade)
32 inverted V-shaped tip 32a first inverted V-shaped tip 32′a first ′ inverted V-shaped tip 32b second inverted V-shaped tip 32′b second ′ inverted V-shaped tip 33a, 33′a end material side inclined blade ( The other inclined blade)
33b, 33'b Product side tilt relief blade (one tilt relief blade)
34a, 34'a Chamfering blade 35, 35 'Relief 36 Printed circuit board B Tip cutting edge width H1 Inclined blade (inclined relief blade) height K V groove (V cut) angle K1 Inclined blade inclination angle K2 Inclined relief Blade inclination angle K3, K4 Chamfering blade inclination angle S Substrate remaining thickness T Base metal thickness T1 Chip width W1 V groove (V cut) depth Y Center line α Rake angle δ Lead angle

Claims (1)

A saw-toothed blade base is formed at a predetermined pitch in the circumferential direction on the outer periphery of the disk-shaped rotating body, the blade base is formed in a reverse V shape when viewed from the front, and a side view L on the rotational direction surface side of the blade base. A rotary tool formed by forming a notch mounting part in a mold and fixing a reverse V-shaped tip in front view integrally having a polycrystalline diamond layer on the front side of the cemented carbide layer on the mounting part, The inverted V-shaped tip is composed of a first inverted V-shaped tip having a lead angle on one inclined blade side serving as a dominant blade and a second inverted V-shaped tip having a lead angle on the other inclined blade side serving as a dominant blade. The first inverted V-shaped tip is formed such that the inclination angle of the other inclined escape blade serving as the escape blade with respect to the center line hanging from the tip of the blade edge is smaller than the inclination angle of one inclined blade serving as the dominant blade. A chamfering blade having a continuously increased inclination angle is provided only at the lower end of the blade, The 2 inverted V-shaped tip is formed so that the inclination angle of one inclined relief blade that is a relief blade with respect to the center line hanging from the tip of the blade edge is smaller than the inclination angle of the other inclined blade that is a dominant blade. A rotating tool characterized in that inverted V-shaped tips and second inverted V-shaped tips are alternately arranged in the circumferential direction and fixed to the mounting portion.

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