JP2003175413A - Drill - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drill capable of improving the positioning accuracy of a drill body with a tip and performing a stable machining operation. <P>SOLUTION: This drill D has a drill body 1 capable of rotating round the axis O and a tip 2 removably fitted to the drill body 1. The drill body 1 is provided with a recessed groove 6 having a notch 6c opened to the tip face 3 and formed in the side of the drill body 1 to be connected to the opening. The inside surface 6b of the recessed groove 6 is provided with a guide groove 7 extending to the direction intersecting the axis O. The outside surface 2b of the tip 2 is provided with a projection 13 engaged with the guide groove 7. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drill having a throw-away tip that is attachable to and detachable from a groove portion formed on the tip surface of a drill body.

[0002]

2. Description of the Related Art Conventionally, a detachable throw-away tip (hereinafter referred to as "tip") is attached to a groove body having a concave groove portion on the tip surface, and the used tip is re-polished. There is a drill that can be used as a disposable tool without the need to re-grind the tool and reduce the tool replacement time. A technique relating to such a drill is disclosed in, for example, Japanese Patent Laid-Open No. 11-197923. In the drill disclosed in the publication, a round hole-shaped mounting hole is formed on the bottom surface facing the tip side of the recessed groove portion, and a rear end surface of the chip facing the bottom surface is insertable into the mounting hole. A columnar shaft portion formed along the axis is provided. Then, the tip is attached to the drill body by inserting the shaft portion into the attachment hole in the axial direction. Here, the shaft portion is provided with a notch portion, and since an engaging member capable of projecting and retracting is provided on the inner periphery of the mounting hole, by inserting the shaft portion into the mounting hole,
The notch and the engaging member engage with each other, whereby the tip is fixed to the drill body.

[0003]

In the above-mentioned drill, the tip can be fixed to the drill body simply by inserting the shaft portion into the attachment hole in the axial direction, so that the tip mounting operation is easy and effective. Since the tip and the drill body are connected via the shaft, there is a problem that the shaft is broken if the shaft is thin. Furthermore, since the alignment of the tip and the drill body (centering) is performed only by fitting the shaft portion and the mounting hole, the alignment accuracy may be insufficient, and the drill machining accuracy for the workpiece Could have an adverse effect on.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a drill capable of improving the alignment accuracy between the drill main body and the tip and performing a stable working operation. To do.

[0005]

In order to solve the above problems, a drill of the present invention is a drill having a drill body rotatable about an axis and a throw-away tip detachably attached to the drill body. A concave groove portion having a cutout portion formed on a side surface of the drill body so as to be continuous with the opening, the groove body being formed along a plane including the axis and opening at a tip end surface of the drill body. A guide groove extending in a direction intersecting the axis is provided on an inner side surface of the concave groove portion, and a convex portion engageable with the guide groove is provided on an outer side surface of the throw-away tip. The groove allows the throw-away tip to be arranged, and the throw-away tip is cut into the concave groove while engaging the convex portion and the guide groove. By inserting from the side through the part, characterized in that the throw-away tip is attached to the drill body.

According to the present invention, a recessed groove portion having a notch portion is provided on the side surface of the drill body so as to open to the tip end surface of the drill body and to be continuous with the opening, and the inner side surface of this recessed groove portion intersects with the axis. In addition to providing a guide groove extending in the same direction, a convex portion that engages with the guide groove is provided on the outer surface of the throw-away tip, and by forming a serration structure with these guide groove and the convex portion, the convex portion is engaged with the guide groove. The throw-away tip can be easily attached to the drill body by simply inserting the throw-away tip from the side into the groove through the notch while sliding it. Further, since the guide groove and the convex portion are formed so as to extend in the direction intersecting the axis, the drill body and the tip are firmly connected and fixed, particularly in the direction along the axis.

In this case, the throw-away tip is formed in a plate shape and has a through hole penetrating in the plate thickness direction. A hole portion is formed which is set so as to match the through hole in a state where the throw-away tip is attached and extends in a direction intersecting with the axis line, and the hole portion formed in each of the through hole and the inner side surface. Since the fixing member that fits into the drill body is provided, the positioning accuracy of the throw-away tip with respect to the drill body is improved, and the fixing member does not cause the positional deviation even during the machining operation for the drill body, the tip, and the workpiece. Therefore, high processing accuracy can be realized.

[0008]

DETAILED DESCRIPTION OF THE INVENTION A drill of the present invention will be described below with reference to the drawings. 1A and 1B are side views of a drill according to the present invention. FIG. 1A is a side view seen from the Y direction, and FIG. 1B is a side view seen from the X direction. Further, FIG. 2 is a view of FIG. 1A viewed from the tip end side (Z direction side). FIG. 3 is a sectional view taken along the line AA of FIG. Furthermore, FIG.
Is a side view of the throw-away tip seen from the Y direction, and Fig. 5
4 is a view of FIG. 4 seen from the tip side, and FIG. 6 is a side view of the throw-away tip seen from the X direction.

In FIG. 1, a drill D comprises a drill body 1 rotatable around an axis O, and a throw-away tip (hereinafter referred to as "tip") 2 detachably attached to the drill body 1. . Tip 2 has a cutting edge 2a
have. The rear end side of the drill body 1 is a shank portion 1a which is a large diameter portion. On the other hand, on the tip side of the drill body 1, a pair of chip discharge grooves 4 that are open to the tip surface 3 of the drill body 1 are formed. Here, the chip discharge groove 4 is
As shown in FIG. 2, they are spirally formed on opposite sides of the axis O and twisted toward the rear end side in the drill rotation direction T at the time of drilling around the axis O toward the rear end side. ing.

A groove 6 is formed at the tip of the drill body 1. The concave groove portion 6 is formed along a plane including the axis O and is formed so as to open to the tip surface 3 of the drill body 1. The recessed groove portion 6 is formed by cutting out between the wall surfaces facing the drill rotation direction T side on the tip end side of the chip discharge groove 4 in the diameter direction with respect to the axis O, and the tip end side is directed. A bottom surface 6a orthogonal to the bottom surface 6a, a pair of inner side surfaces 6b orthogonal to the bottom surface 6a and extending along the axis O, and a notch cut out to the side surface of the drill body 1 so as to be continuous with the opening of the tip surface 3. 6c and. Then, as shown in FIG. 1B, the recessed groove portion 6 is formed so as to open in a U-shape toward the front end surface 3 in a side view, and the chip 2 can be arranged.

As shown in FIG. 1, a guide groove 7 extending in a direction intersecting the axis O is formed on the inner side surface 6b of the concave groove portion 6. The guide groove 7 is formed by arranging a plurality of groove portions extending in a direction intersecting with the axis O side by side in the direction along the axis O, and is formed on each of the pair of inner side surfaces 6b. At this time, the guide groove 7 is not formed on the entire surface of the inner side surface 6b, and as shown in FIG. 1A, is formed from the vicinity of each axis O of the inner side surface 6b to one end in the X direction. Has been done.

As shown in FIG. 1, a flow path 5 is formed along the axis O inside the drill body 1. Channel 5
Is formed so that the rear end surface 8 and the front end surface 3 of the drill body 1 communicate with each other. Then, as shown in FIG. 1 (a), on the side of the rear end surface 8 of the drill body 1 in the flow path 5, the processing oil (fluid) is provided outside the drill body 1 with respect to the flow path 5. A processing oil supply unit 9 that can supply the oil is connected. On the other hand, as shown in FIG. 1B and FIG.
The tip side of the two is connected to two openings 24 formed in the tip surface 3 via a branch portion 25. From the processing oil supply unit 9 provided outside the drill body 1 to the flow path 5
The processing oil supplied to the flow path 5 is supplied from the rear end face 8 side of the flow path 5 to the flow path 5
To the opening 2 after being branched into two at the branch 25.
It flows out from each of 4 to the tip 2 of the tip 2 (the tip of the drill body 1).

The chip 2 is arranged in the groove 6 with its rear end face 2c facing the bottom face 6a. The tip 2 is made of a hard material such as cemented carbide, and is formed into a flat plate having a substantially pentagonal shape as shown in FIGS. It is attached to the groove 6. The chip 2 has a through hole 10 which is opened in the center in the X direction so as to penetrate in the thickness direction (plate thickness direction).

On the other hand, as shown in FIG. 3, each of the inner side surfaces 6b of the concave groove portion 6 facing each other is set so as to coincide with the through hole 10 of the chip 2 with the chip 2 attached. Holes 11A and 11B are formed. Each of the hole portions 11A and 11B is formed so as to extend in a direction intersecting with the axis O, that is, to coincide with the forming direction of the through hole 10, and the through hole 10,
The diameters of the holes 11A and 11B are set to be the same. Of these, the end of the hole 11A in the −Y direction is
As shown in FIG. 3, a large diameter portion 11Aa is formed to communicate with the outside, and the + Y side end of the hole portion 11B has a female screw portion 11Bb.
Has become.

In the holes 11A and 11B and the through hole 10,
A fixing member 12 as a bolt having a male screw portion 12a only at its tip is arranged. The portion of the fixing member 12 other than the male screw portion 12a is the cylindrical portion 12
The column portion 12b and the hole portion 11A, the through hole 10, and the hole portion 11B which have the same diameter are fitted with each other. Then, the fixing member 12 is inserted from the hole portion 11A side formed so as to communicate the outside of the drill body 1 and the recessed groove portion 6, and the male screw portion 12a of the fixing member 12 and the female screw portion 11Bb of the drill body 1 are inserted. The drill body 1 and the tip 2 are connected and fixed by screwing. Here, the through hole 10 and the hole portions 11A and 11B
Are formed in the central portion in the X direction, and coincide with the axis O.

As shown in FIGS. 4 and 6, the outer surface 2b of the tip 2 is formed with a plurality of protrusions 13 which can be engaged with the guide grooves 7 of the drill body 1. The convex portions 13 are formed so as to extend in a direction intersecting with the axis O, that is, their ridge lines intersect with the axis O, and a plurality of convex portions 13 are formed side by side in the direction along the axis O. The convex portion 13 is formed at a position corresponding to the position where the guide groove 7 of the concave groove portion 6 is formed when the chip 2 is arranged in the concave groove portion 6. That is,
The convex portion 13 is formed on each of the pair of outer side surfaces 2b, and extends from the vicinity of each axis O of the outer side surface 2b to one end in the X direction.

When the tip 2 is attached to the drill body 1, the tip surface 3 of the tip 2 is formed into an isosceles triangular shape that gradually recedes from the axis O toward the outer peripheral side. , The cutting edge 2a on the ridge line intersecting with the rake face 20 facing the drill rotation direction T side in the state of being attached to the drill body 1 on both outer side faces 2b of the tip 2.
Are formed respectively. And this rake face 20
Is an inclined surface that gradually narrows toward the rear end side of the tip 2 and gradually recedes to the outer surface 2b side on the opposite side, and faces the drill rotation direction T of the chip discharge groove 4 in the mounted state. It is connected to the wall. Then, the convex portions 13 are formed on portions of the outer side surfaces 2b other than the rake face 20.

Next, the procedure for attaching the tip 2 to the drill body 1 and the operation during drilling in the drill D having the above-described structure will be described. Drill body 1
When attaching the tip 2 to the drill 2, the formation direction of the through hole 10 of the tip 2 and the formation direction of the through hole 11 of the drill body 1 are made to coincide with each other and the side of the drill body 1 is inserted into the groove 6 through the notch 6c. The chip 2 is inserted in the Y direction, that is, in the direction intersecting the axis O (see arrow S in FIG. 1). When inserting the chip 2 into the concave groove portion 6, the convex portion 13 and the concave groove portion 6 of the chip 2 are inserted.
It is inserted while sliding while being engaged with the guide groove 7 of. At this time, the rear end surface 2c of the chip 2 and the bottom surface 6a of the recessed groove portion 6 abut and slide. Then, the rear end surface 2c of the chip 2 is slid against the bottom surface 6a of the groove 6 while sliding for a predetermined distance so that the through hole 10 of the chip 2 and the holes 11A and 11B of the drill body 1 are aligned with each other. In this state, from the large diameter portion 11Aa (hole portion 11A) side, the drill body 1
Insert the fixing member 12 into the through hole 10 of the chip 2.
The male screw portion 12a at the tip of the fixing member 12 through the hole 1
It is arranged on the female screw portion 11Bb of 1B and screwed. At this time, since the cylindrical portion 12b of the fixing member 12 is fitted into each of the hole portion 11A, the through hole 10, and the hole portion 11B, the drill body 1 and the tip 2 are positioned and connected and fixed to each other.

Here, the size in the plate thickness direction of the portion where the rake face 20 is provided is set to be smaller than the size in the plate thickness direction of the portion where the convex portion 13 is provided (size at the top of the convex portion 13). Has been done. Thereby, the groove 6
On the other hand, the insertion operation when inserting the chip 2 while sliding the convex portion 13 and the guide groove 7 is not hindered.

When removing the tip 2 from the drill body 1, the male screw portion 12a and the hole portion 11B of the fixing member 12 are removed.
The screw body 11Bb is unscrewed, the fixing member 12 is removed, and then the tip 2 is pulled out from the groove 6 in the direction of the arrow S, whereby the drill body 1 and the tip 2 are separated.

After the tip 2 is fixed to the drill body 1, the working oil is supplied from the working oil supply portion 9 to the flow path 5 of the drill body 1 while the work is drilled. The processing oil supplied to the flow path 5 is discharged from the opening 24 formed in the tip surface 3 of the drill body 1 via the branch portion 25. In this way, it is possible to perform drilling while supplying the working oil to the work.

As described above, the concave groove portion 6 having the notch portion 6c is provided on the side surface of the drill body 1 so as to open to the tip surface 3 of the drill body 1 and to be continuous with this opening.
A guide groove 7 extending in a direction intersecting the axis O is provided on the inner side surface 6b of the concave groove portion 6, and the outer side surface 2 of the chip 2 is provided.
By providing a convex portion 13 that engages with the guide groove 7 in b, and configuring the serration structure with the guide groove 7 and the convex portion 13, the notch portion 6c is formed in the concave groove portion 6 while the convex portion 13 is engaged with the guide groove 7. The tip 2 can be easily attached to the drill body 1 simply by inserting the tip 2 while sliding it from the side. Further, since the guide groove 7 and the convex portion 13 are formed so as to extend in the direction intersecting with the axis O, the positioning of the drill body 1 and the tip 2 in the direction along the axis O is stabilized, and firmly fixed to each other. To be done.

Then, the tip 2 is formed in a plate shape and a through hole 10 is formed in the plate thickness direction, and the tip 2 is attached to each of the inner side surfaces 6b of the concave groove portion 6 of the drill body 1 which face each other. By providing the hole portions 11A and 11B set so as to match the through hole 10 in the opened state, the fixing member 12 having the column portion 12b is arranged in each of the through hole 10 and the hole portions 11A and 11B. Thereby, the positioning accuracy of the tip 2 with respect to the drill body 1 is improved. Further, since the drill body 1 and the tip 2 are firmly connected and fixed by the fixing member 12, the positional deviation does not occur even during the machining operation on the work. Therefore, high processing accuracy can be realized.

[0024]

According to the present invention, a concave groove portion having a notch portion is provided on the side surface of the drill body so as to be continuous with the opening at the tip end surface of the drill body, and the axial line is provided on the inner side surface of the concave groove portion. While the guide groove extending in the direction intersecting with the guide groove is provided, a convex portion that engages with the guide groove is provided on the outer surface of the chip, and the serration structure is formed by these guide groove and the convex portion so that the convex portion engages with the guide groove. Meanwhile, by simply inserting the tip from the side while sliding it into the groove through the notch, the tip and the drill body can be positioned stably and easily connected to each other. Therefore, high processing accuracy can be realized, and workability of indexable insert replacement can be improved.

[Brief description of drawings]

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

FIG. 2 is a view of the drill of FIG. 1 viewed from the tip side.

3 is a sectional view taken along the line AA of FIG.

FIG. 4 is a side view of the throw-away tip.

FIG. 5 is a view of the throw-away tip as seen from the tip side.

FIG. 6 is a side view of the throw-away tip.

[Explanation of symbols]

1 drill body 2 chips (throw away chips) 2a cutting edge 2b outer surface 3 Tip surface 5 channels 6 concave groove 6a bottom 6b inner surface 6c Notch 7 guide groove 12 fixing members 13 convex O axis D drill

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yasuhiko Kawade             1528, Nakashinden, Yokoi, Kobe-cho, Anpachi-gun, Gifu Prefecture             Address Mitsubishi Materials Corporation Gifu Factory             Within F term (reference) 3C037 BB00 BB15

Claims (2)

[Claims] 1. A drill having a drill body rotatable about an axis and a throw-away tip detachably attached to the drill body, wherein the drill body is formed along a plane including the axis. A recessed groove portion having a notch portion formed on a side surface of the drill body so as to be open to the tip end surface of the drill body and continuous with the opening is provided, and an inner side surface of the recessed groove portion is provided in a direction intersecting with the axis. An extending guide groove is provided, an outer surface of the throw-away tip is provided with a convex portion that can be meshed with the guide groove, and the concave groove portion can be arranged with the throw-away tip, and the convex portion and the By inserting the throw-away tip from the side into the groove portion through the notch while engaging with the guide groove, the throw-away tip is inserted. Drill, characterized in that the chip is attached to the drill body. 2. The throw-away tip is formed in a plate shape and has a through hole penetrating in the plate thickness direction, and the throw-away tip is provided on each of the inner side surfaces of the concave groove portion facing each other. A hole portion that is set so as to match the through hole in a state where a chip is attached and extends in a direction intersecting the axis is formed, and the through hole and the hole portion formed on each of the inner side surfaces. The drill according to claim 1, further comprising a fixing member that fits.