JP2000271815A - Rotating tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smooth a cutting face after recessing or chamfering by projecting prescribed inclined cutting edges sideway relative to other respective inclined cutting edges. SOLUTION: Inclined cutting edges 25-1a, 25-1b of a finishing tip 25-1 provided in a rotor 21 are projected outward than inclined cutting edges 25-2a, 25-2b of a lot of respective cutting angle tips 25-2 provided in the rotor so that a cutting face cut by the respective cutting angle tips 25-2 is finish cut by the finishing tip 25-1. That is to say, a knife mark is formed in a corresponding cutting face by an inclined cutting edge 25-1a, 25-1b so that the pitch of the knife mark becomes large and thin and therefore the cutting face of a terminal part can be finished smoothly to prevent the finishing terminals from short- circuited to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a groove processing of a processing material,
Alternatively, the present invention relates to a rotary tool for chamfering, for example, forming a groove in a divided portion of a multi-faced printed circuit board having a printed circuit on the surface of an insulating plate, or chamfering an end face (terminal portion) of the divided printed circuit board.

[0002]

2. Description of the Related Art First, as a rotary tool for groove machining, FIG.
0 and those shown in FIG. In FIG. 20, reference numeral 1 denotes a rotary tool for forming a groove, which has a sawtooth-shaped blade base 3 formed at an equal pitch in the circumferential direction on the outer periphery of a disk-shaped rotating body 2. The blade base 3 is formed in a mountain shape when viewed from the front, and the mounting portion 3a which is notched in an L-shape when viewed from the side in the rotation direction (A) surface side of the blade base 3.
Is formed on the mounting portion 3a, and the angled tip 5 (5-1, 5-
2,5-3 ...) are fixed.

As shown in FIG. 21, the angled tip 5 is formed by a PCD (polycrystalline diamond) having a diamond layer 5b on the front side of a cemented carbide 5a, as shown in FIG. Is mounted on the mounting portion 3a facing the rotating surface side and brazed and fixed with silver brazing or the like, and then the angled cutting edge (inclined cutting edge) of the angled chip 5 is formed.
5c, 5c is polished so that the angle α of the peak is about 60 degrees.

FIG. 2 shows a rotary tool for chamfering.
4 to FIG. 25. In FIG. 24, reference numeral 7 denotes a rotary tool for chamfering, which has a sawtooth-shaped blade base 9 formed on the outer periphery of a disk-shaped rotating body 8 at a constant pitch in the circumferential direction.
The blade base 9 is formed in a valley shape when viewed from the front, and a mounting portion 9a which is notched in an L-shape when viewed from the side is formed on the rotation direction (A) surface side of the blade base 9, and the valley shape is formed in the mounting portion 9a. Chip 10 (10-
1, 10-2, 10-3,...) Are fixed.

The valley-shaped tip 10 is formed by PCD (polycrystalline diamond) having a diamond layer 10b on the front side of a cemented carbide 10a, as shown in FIG. The valley-shaped cutting edge (inclined cutting edge) 10c, 10c of the valley-shaped chip 10 is polished after the mounting of the valley-shaped tip 10 is performed by mounting the 10b on the mounting portion 9a facing the rotation surface side and brazing with a silver braze or the like. Predetermined valley angle β
To form

[0006]

The angled tips 5 of the rotary tool 1 for grooving and the valley shaped tips 10 of the rotary tool 7 for chamfering have the same shape and height in front view. It was formed to become. However, due to the processing accuracy of the polishing machine, the consumption of the polishing grindstone, etc., it is not possible to make each of the above-mentioned chevron chips 5 and valley-shaped chips 10 all the same shape and height, and as shown in FIGS. Angled cutting edge 5c (5c-1, 5c-2, 5c-3
..), each valley-shaped cutting edge 10c (10c-1, 10c-
2,10c-3...).

For this reason, the conventional rotary tool 1 for groove machining,
Alternatively, when using the rotary tool 7 for chamfering, FIG.
As shown in FIGS. 2 to 23 or FIGS.
No. 2 cutting edges 5c-1, 5c-2, 5c-
3, each valley-shaped cutting edge 10c-1, 10c-2, 10
c-3... each generate a knife mark (a) on the cut surface, and the knife mark (a) becomes deeper and denser, resulting in a rougher cut surface. In particular, when the processing material 12 is a printed circuit board having a printed wiring on the surface and the terminal portion 13 has a dividing groove 14 or an end face of the terminal portion 13 which is chamfered 15, the cut surface 13a of the terminal portion 13 becomes as shown in FIG. As shown in FIG. 26, there is a possibility that the adjacent terminal portions 13 may be short-circuited due to a rough surface.
It required separate finishing. An object of the present invention is to obtain a new rotary tool that has solved the above-mentioned problems.

[0008]

Means for Solving the Problems The present invention is configured as follows to achieve the above object. That is, according to the first aspect of the present invention, a large number of chips having inclined cutting edges inclined sideways with respect to the rotating surface of the rotating body are provided at predetermined intervals in the circumferential direction on the outer peripheral portion of the rotating body. Among the inclined cutting edges inclined in the same direction, a predetermined one inclined cutting edge is configured to protrude laterally with respect to another inclined cutting edge. Further, the invention of claim 2 provides a large number of chips having a mountain-shaped or valley-shaped cutting edge in front view at a predetermined interval in a circumferential direction on an outer peripheral portion of the rotating body, and among the chips,
The configuration is such that an inclined cutting edge of one predetermined chip is laterally projected from an inclined cutting edge of another chip. Further, the invention according to claim 3 provides a large number of chips having an inclined cutting edge having a mountain shape or a valley shape in a front view at an outer peripheral portion of a rotating body at predetermined intervals in a circumferential direction, and among the chips, In this configuration, two predetermined chips are deviated by a predetermined amount toward opposite sides to other chips. Further, according to the invention of claim 4, a large number of angled tips having angled cutting edges in a front view are provided at predetermined intervals in the circumferential direction on the outer peripheral portion of the rotating body, and a predetermined one of the angled tips is provided. In this configuration, the base of the inclined cutting edge of the angled tip projects outward with respect to the base of the inclined cutting edge of another chip. Further, the invention of claim 5 provides a plurality of valley-shaped chips having a valley-shaped cutting edge in a front view at predetermined intervals in a circumferential direction on an outer peripheral portion of the rotating body,
In each of the valley-shaped tips, the tip of the opposite inclined cutting edge of one predetermined valley-shaped tip is configured to protrude inward with respect to the tip of the opposite inclined cutting edge of another tip. .

[0009]

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, FIG. 1 is a partial side view of a rotary tool having an angled tip according to the present invention, FIG. 2 is a sectional front view viewed from the direction of arrow A in FIG. 1, and FIG. 3 is an enlarged front view corresponding to FIG. It is sectional drawing. In FIG. 1, reference numeral 20 denotes a rotary tool having a chevron-shaped tip, and a saw-tooth-shaped blade base 22 is formed on the outer periphery of a disk-shaped rotating body 21 at a constant pitch in the circumferential direction. This blade base 22 is formed in a mountain shape when viewed from the front,
A mounting portion 22a, which is cut out in an L-shape when viewed from the side, is formed on the rotation direction (A) surface side of the blade base 22, and the angled chip 25 is fixed to the mounting portion 22a.

[0010] The angled tip 25 is formed of a number of cut angled tips 25-2, 25-2.
.. and one finishing tip 25-1 projecting slightly outward in the radial direction (H). The finishing tip 25-1 has a slanted cutting edge 25-1 opposed thereto.
a, 25-1b, as shown in FIGS. 2 and 3, the inclined cutting edges 25-2a, 2-2 of the respective cutting angled tips 25-2 facing each other.
5-2b is projected outward by an amount S (for example, 0.1 mm to 0.2 mm) in consideration of these processing errors.

The above-mentioned finished chip 25-1 and each cutting angled chip 25-2 are made of PCD (polycrystalline diamond) having a diamond layer 25b on the front side of a cemented carbide 25a.
As shown in FIGS. 2 and 3, the diamond layer 25b is mounted on the mounting portion 22a facing the rotation surface side and brazed and fixed with silver brazing or the like, as shown in FIGS. Each inclined cutting edge 25-1a, 25-1b, 25-2
a, 25-2b are polished to set the peak angle α to a predetermined angle.

The above-mentioned finishing chip 25-1 may have a structure shown in FIG. 6, FIG. 7, or FIGS. That is, as shown in FIG. 6, the height of the finishing tip 25-1 is made the same as the height of each cutting chevron tip 25-2.
The angle α1 of the peak of the finishing tip 25-1 is made slightly larger than the angle α of the peak of each cutting angled tip 25-2, whereby the facing inclined cutting edge 25-1a of the finishing tip 25-1 is formed. , 25-1b are connected to the respective inclined cutting edges 25-2a, 25-2b of the cutting angled tips 25-2.
To the outside of the base.

Further, as shown in FIG.
5-1 is enlarged in a similar shape to each of the cutting angled tips 25-2, and the entire area of the inclined cutting edges 25-1a and 25-1b opposed to the finished chip 25-1 is adjusted to each of the cutting angled tips 25-2.
-2 projecting outward with respect to the inclined cutting edges 25-2a and 25-2b opposite to each other, and
-1 is removed and the height of each cutting angled tip 25 is adjusted.
Make it the same height as -2.

As shown in FIGS. 8 and 9, predetermined two chips of each chevron chip 25 are
5-3 and 25-4, and these are offset to the side opposite to each other with respect to the remaining cutting angled tip 25-2. The amount of deviation D is equal to one of the inclined cutting edges 25-3a, 25-3a of the finishing tips 25-3, 25-4 which are inclined in opposite directions.
25-4b protrudes outward slightly more than the outward processing error (T) with respect to the inclined cutting edges 25-2a and 25-2b serving as the reference of the cutting angled tip 25-2 (S). ).

According to the rotary tool having the angled tip, the finishing tip 25-1 (25-
3, 25-4) inclined cutting edges 25-1a, 25-1b
(25-3a, 25-4b) are inclined cutting edges 25-2a, 25-2a,
Since it protrudes outward beyond 25-2b, the above-mentioned finishing tip 25-1 finish-cuts the cutting surface cut by each cutting angled tip 25-2. That is, as shown in FIGS. 4 and 5, when the rotary tool 20 according to the above-described embodiment forms a processing material 27, for example, a dividing groove 28 on the upper and lower surfaces of a terminal portion 29 of a printed circuit board 27 having a printed wiring on the surface. The knife mark (A) generated on each cutting surface of the groove 28 is mainly a knife mark (A) formed by the finishing tip 25-1.

The knife mark (a) is provided with one inclined cutting edge 25-1a, 25-1b with respect to the corresponding cutting surface.
(25-3a, 25-4b), the knife mark has a large pitch and is thin, and the terminal portion 2
9, the cut surface 29a is finished smoothly, and short-circuiting between the terminals is prevented. As shown in FIG. 10, one of the cutting edges of the angled tip 25, that is, the left inclined cutting edge 25-
Even when the end face of the processed material 27 'such as a decorative board is chamfered 30 by 1a, 25-2a, the same function as described above is exerted, and the chamfered portion 30 is finished to a smooth surface.

FIGS. 11 and 12 show a rotary tool having a valley-shaped tip according to the present invention. FIG. 11 is a partial side view of the rotary tool having a valley-shaped tip. FIG. In FIG. 11, reference numeral 35 denotes a rotary tool having a valley-shaped tip.
Are formed at equal pitches in the circumferential direction on the outer circumference of the blade. The blade base 37 is formed in a valley shape when viewed from the front, and a box-shaped notch mounting portion 37a having both side walls and a bottom wall is formed on the side of the blade base 37 in the direction of rotation (A). The valley tip 40 is fixed to the portion 37a.

The above-mentioned valley-shaped tip 40 is made up of a large number of cutting valley-shaped tips 40-2, 40-2,.
.. and one finishing tip 40-1 projecting (H) slightly outward in the radial direction from these. As shown in FIG. 12, in the finished insert 40-1, the opposed inclined cutting edges 40-1a and 40-1b are formed so that the opposed inclined cutting edges 40-2a and 40-2b of the respective cutting valley-shaped tips 40-2.
The amount S (for example, 0.
(1 mm to 0.2 mm) The size protrudes inward.

The above-mentioned finished tip 40-1 and each cutting valley-shaped tip 40-2 are made of PCD (polycrystalline diamond) having a diamond layer 40b on the front side of a cemented carbide 40a.
As shown in FIG. 11, the diamond layer 40b is mounted on the mounting portion 3a with the diamond layer 40b facing the rotation side and brazed and fixed with silver brazing or the like as shown in FIG. -1a, 40-1b, 40-2a, 40-2b
Is ground to set the valley angle β to a predetermined value.

The finishing chip 40-1 may have the structure shown in FIG. 16, FIG. 17 to FIG. 18, or FIG. That is, as shown in FIG.
Is slightly higher than each cutting valley-shaped tip 40-2, and the valley angle β1 of the finished tip 40-1 is made slightly smaller than the valley angle β of each cutting valley-shaped tip 40-2. Thereby, the tip portions of the inclined cutting edges 40-1a and 40-1b of the finishing tip 40-1 are set to the inclined cutting edges 40-2 of the respective cutting valley-shaped tips 40-2.
a, Protrude inward with respect to the tip of 40-2b.

As shown in FIGS. 17 and 18, two of the valley-shaped inserts 40 are designated as finished inserts 40-3 and 40-4, and these are used as the remaining cut valley-shaped inserts 40. -2 to the side opposite to each other. The amount of deviation D is equal to the amount of the finished chips 40-3, 40
-4, one inclined cutting edge 40- inclined in the opposite direction to each other
3a, 40-4b are inclined cutting edges 40-2a, 40-2b, 25-2 that serve as references for the cutting valley-shaped tip 40-2.
b is deviated so as to protrude inward (S) slightly more than the inward machining error (T).

As shown in FIG. 19, predetermined two chips of each valley-shaped chip 40 are replaced with triangular finished chips 40-5 and 40-6 having opposite tip inclination angles.
Replace with Each of the finishing tips 40-5 and 40-6 has the inclined cutting edges 40-5a and 40-6b facing each other and the inclined cutting edge 40 of the cutting valley-shaped tip 40-2.
-2a and 40-2b are projected inward (S) in the same manner as described above.

According to the rotary tool having the valley-shaped tips, the finishing tips 40-1 (40-
3, 40-4, 40-5, 40-6) inclined cutting edge 40
-1a, 40-1b (40-3a, 40-4b, 40-
5a, 40-6b) are the inclined cutting edges 40-2a, 40-2 of the respective cutting valley-shaped tips 40-2 provided on the rotating body 36 in large numbers.
b, the cutting surface cut by each cutting valley-shaped tip 40-2 is cut into the above-mentioned finishing tip 40-1.
Will be finish-cut. That is, as shown in FIGS. 13 and 14, when the end surface of the processing material 41, for example, the printed circuit board 41 having the terminal portion 43 at the end is chamfered 42 by the rotary tool 35, a knife mark ( A) mainly serves as a knife mark by the finishing chip 40-1.

The knife mark (a) is provided with one inclined cutting edge 40-1a,
40-1b (40-3a, 40-4b, 40-5a, 4
0-6b), a knife mark having a large pitch and a thin pitch is formed.
Is finished smoothly and the terminals are not short-circuited.

[0025]

As is apparent from the above description, according to the present invention, among the inclined cutting edges of a number of chips provided on the outer peripheral portion of the rotating body, a predetermined one inclined cutting edge is replaced with each of the other inclined cutting edges. , So that the protruding inclined cutting edge removes the knife mark on the cutting surface formed by each of the other inclined cutting edges. The surface becomes smooth. In addition, for each inclined cutting edge other than the predetermined one inclined cutting edge, it is not necessary to increase the polishing accuracy, and the manufacturing cost is reduced.

[Brief description of the drawings]

FIG. 1 is a partial side view of a rotary tool having an angled tip according to the present invention.

FIG. 2 is an explanatory front cross-sectional view seen from the direction of arrow A in FIG. 1;

FIG. 3 is an enlarged front sectional view of FIG. 2 corresponding to FIG. 2;

FIG. 4 is a plan view showing a knife mark of a groove processing portion of a processing material.

FIG. 5 is a sectional view taken along line BB of FIG. 4;

FIG. 6 is an explanatory front sectional view corresponding to FIG. 2, showing a second embodiment of a rotary tool having a chevron tip according to the present invention.

FIG. 7 is an explanatory front sectional view corresponding to FIG. 2, showing a third embodiment of a rotary tool having an angled tip according to the present invention.

FIG. 8 is a plan view showing a rotary tool having an angled tip according to a fourth embodiment of the present invention.

FIG. 9 is an explanatory front cross-sectional view as viewed from the direction of arrow A in FIG. 8;

FIG. 10 is an explanatory sectional view showing a chamfered state of a processing material.

FIG. 11 is a partial side view of a rotary tool having a valley-shaped tip according to the present invention.

FIG. 12 is an explanatory front cross-sectional view as viewed from the direction of arrow A in FIG. 11;

FIG. 13 is a plan view showing a knife mark of a chamfered portion of a processing material.

FIG. 14 is a view as viewed from C in FIG. 13;

FIG. 15 is a sectional view taken along the line DD in FIG. 13;

FIG. 16 is an explanatory front sectional view showing a second embodiment of a rotary tool having a valley-shaped tip according to the present invention.

FIG. 17 is a partial plan view showing a rotary tool having a valley-shaped tip according to a third embodiment of the present invention.

18 is a front sectional view for explanation as seen from the direction of arrow A in FIG. 17;

FIG. 19 is an explanatory front sectional view showing a fourth embodiment of a rotary tool having a valley-shaped tip according to the present invention.

FIG. 20 is a partial side view of a rotary tool having a chevron tip according to a conventional example.

FIG. 21 is an explanatory front cross-sectional view as viewed from the direction of arrow A in FIG. 20;

FIG. 22 is a plan view showing a knife mark of a groove processing portion of a processing material according to a conventional example.

FIG. 23 is a sectional view taken along line EE of FIG. 22;

FIG. 24 is a partial side sectional view of a rotary tool having a valley-shaped tip according to a conventional example.

FIG. 25 is a front sectional view for explanation as seen from the direction of arrow A in FIG. 24;

FIG. 26 is a plan view showing a knife mark of a chamfered portion of a processing material according to a conventional example.

FIG. 27 is a sectional view taken along line FF of FIG. 26;

[Explanation of symbols]

 Reference Signs List 20 rotary tool having angled tip 21 rotating body 22 blade base 22a mounting portion 25 angled tip 25a cemented carbide 25b diamond layer 25-1 finishing tip 25-1a, 25-1b inclined cutting edge 25-2 cutting angled tip 25- 2a, 25-2b Inclined Cutting Edge 25-3 Finishing Tip 25-3a Inclined Cutting Edge 25-4 Finishing Tip 25-4b Inclined Cutting Edge 27 (27 ') Work Material (Printed Circuit Board) 28 Groove 29 Terminal 29a Cutting Surface 30 Chamfer 35 Rotary tool having valley-shaped tip 36 Rotating body 37 Blade base 37a Placement part 40 Angled tip 40a Cemented carbide 40b Diamond layer 40-1 Finishing tip 40-1a, 40-1b Inclined cutting edge 40-2 Cutting valley Insert 40-2a, 40-2b Inclined cutting edge 40-3 Finishing tip 40-3a Inclined cutting edge 0-4 finishing chip 40-4b inclined cutting edge 40-5 finishing chips 40-5a inclined cutting edge 40-6 finishing chip 40-6b inclined cutting edge 41 workpiece (printed circuit board) 42 chamfered 43 terminal portions 43a cut surface

Claims (5)

[Claims] 1. A plurality of chips having inclined cutting edges inclined sideways with respect to the rotating surface of the rotating body are provided on an outer peripheral portion of the rotating body at predetermined intervals in a circumferential direction, and are provided in the same direction. A rotating tool characterized in that a predetermined one of the inclined cutting edges protrudes laterally with respect to another inclined cutting edge. 2. A number of chips (2) having a cutting edge of a mountain shape or a valley shape in a front view on the outer peripheral portion of a rotating body (21, 36).
5, 40) are provided at predetermined intervals in the circumferential direction, and a predetermined one of the chips (25, 40) (25, 40) is provided.
-1, 40-1) a rotating tool characterized in that the opposed inclined cutting edges of the other chips (25-2, 40-2) protrude laterally from the opposed inclined cutting edges. 3. A number of chips (25, 40) having inclined cutting edges having a mountain shape or a valley shape when viewed from the front are provided at predetermined intervals in the circumferential direction on the outer peripheral portion of the rotating body (21, 36). ,
Of the chips (25, 40), predetermined two chips (25-3, 25-4; 40-3, 40-4) are mutually connected to the other chips (25-2, 40-2). A rotary tool, which is deviated by a predetermined amount to opposite sides. 4. A plurality of angled chips (25) having a cutting edge having a mountain shape in a front view are provided at predetermined intervals in a circumferential direction on an outer peripheral portion of a rotating body (21), and among the angled chips (25), ,
The base of the opposed inclined cutting edge (25-1a, 25-1b) of one predetermined angled tip (25-1) is connected to the inclined inclined cutting edge (25-2a, 25) of another tip (25-2).
-2b) a rotating tool which is projected outwardly with respect to the base. 5. A plurality of valley-shaped tips (40) having valley-shaped cutting edges as viewed from the front are provided at predetermined intervals in a circumferential direction on an outer peripheral portion of the rotating body (36), and each valley-shaped tip (40) is provided. )
The tip of the opposing inclined cutting edge (40-1a, 40-1b) of one predetermined valley-shaped tip (40-1) is connected to the opposing inclined cutting edge (40-2a, 40-2a, 40-1) of another chip (40-2). 40
2b) A rotary tool, which is projected inwardly with respect to a tip end.