JPH09192913A - Deep hole drill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deep hole drill which can simply replace cutting edges in a short time and which can reduce the cost. SOLUTION: A cutting edge 6 can be attached replaceably to a drill body 3 by a magnetic means 3. Accordingly, the attachment and replacement of the cutting edge 6 can be facilitated. Further, with the use of the magnetic means 5 for attachment of the cutting edge 6, the attachment thereof can be made with a simple construction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deep hole drill for processing a deep hole in a work.

[0002]

2. Description of the Related Art FIG. 10 is a side view of a conventional deep hole drill. In the deep hole drill 100, a drill body 102 is connected to the front part of a shank 101, and a cutting edge 103 is joined to the tip of the drill body 102 by brazing or fastening. When a deep hole is processed by the deep hole drill 100, a large frictional force or the like is generated on the cutting edge 103 and a relatively small frictional force is generated on the drill body 102. Therefore,
The drill body 1 uses expensive wear resistant material for the cutting edge 103.
For 02, a cheaper member than the cutting edge 103 is used.

FIG. 11 is a side view of a conventional stepped deep hole drill. Stepped deep hole drill 104 is shank 10
5, a stepped drill body 106 is connected to the front part of the step 5, and a cutting edge 107 is joined to the tip of the stepped drill body 106 by brazing or fastening. Stepped drill body 1
06 includes a front taper portion 106a and a rear taper portion 106b. The front taper portion 106a is provided with four cutting tips 108 at equal intervals, and the rear taper portion 106b is provided with the cutting tip 109.
Equipped with four at equal intervals.

When machining a stepped deep hole with this stepped deep hole drill 104, a cutting edge 107, a cutting tip 108 ...
Also, a large frictional force or the like is generated in the cutting tips 109, and a relatively small frictional force is generated in the main body of the stepped drill body 106. Therefore, the cutting edge 107, the cutting tip 108 ...
Also, expensive anti-wear material is used for the cutting tip 109, and the cutting body 107 and the cutting tip 1 are provided on the body of the drill body 106.
08 ... and cutting tip 109 ... Use a cheaper member.

[0005]

However, FIG. 10 and FIG.
In the case of 1, when the cutting edges 103 and 107 are joined to the tips of the drill bodies 102 and 106 by brazing, the cutting edges 103 and 107 can be initially re-ground and reused, but the re-grinding is not possible. In this case, it is necessary to heat the brazing part to remove the cutting edges 103 and 107, and then braze new cutting edges to the tips of the drill bodies 102 and 106. Therefore, it takes time to replace the cutting edge, which is not practical. On the other hand, when the cutting edges 103 and 107 are attached to the tips of the drill bodies 102 and 106 by fastening, the fastening mechanism becomes complicated and the cost of the deep hole drill increases.

Therefore, an object of the present invention is to allow the cutting edge to be easily attached and detached so that the cutting edge can be replaced in a short time, and the cutting edge is attached to the drill body with a simple structure. It is to provide an inexpensive deep hole drill.

[0007]

In order to solve the above-mentioned problems, the first aspect of the present invention relates to a deep hole drill in which a drill body is connected to the front part of a shank and a cutting edge is formed at the tip of the drill body. The cutting edge is detachably attached to the drill body via magnetic force means.
Since the cutting edge is detachably attached to the drill body by magnetic means, the cutting edge can be easily attached and detached. Also,
By using the magnetic force means for mounting the cutting edge, the mounting of the cutting edge can be realized with a simple structure.

According to a second aspect of the present invention, in the deep hole drill according to the first aspect, the drill body is divided into a plurality of segments, each of which is detachably fastened by fastening means, and the cutting edge is provided with magnetic force means. It is characterized in that it is detachably attached to the drill body via. Since we split the drill body into multiple segments, if a part of the drill body is damaged, don't replace the whole drill body,
Only the damaged segment can be replaced. In addition, when the deep hole drill is manufactured from a sintered material by dividing it into segments, it can be manufactured by dividing it into a size suitable for molding, firing, and processing. As compared with the case of manufacturing, the yield can be increased by preventing cracks during molding, deformation and cracks during firing, cracks during processing, and the like.

A third aspect of the present invention is characterized in that the fastening means is magnetic force. Since each segment of the drill body is detachably fastened with a magnetic force, each segment can be easily attached and detached.

According to a fourth aspect of the present invention, the fastening means is a threaded member, and the threaded member is communicated with each segment to fasten each segment in series. Since each segment of the drill body is detachably fastened with a screw member, each segment can be connected. Further, by using a material having high toughness for the screwing member, the toughness at the center of the deep hole drill can be increased and the safety can be improved.

A fifth aspect of the present invention is characterized in that the drill body and the shank are provided with a cooling water passage, and the cooling water supplied from the passage cools the magnetic force means, the processing portion, and the drill portion. To do. The drill body and the shank are provided with a flow path, and cooling water is supplied from the flow path to cool the magnetic force means, the processing section, and the drill section. Therefore, the thermal expansion of the magnetic force means can be prevented, and the hole drilling accuracy by the cutting edge is further improved.

[0012]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals. FIG. 1 is a cross-sectional view of a deep hole drill (first embodiment) according to the present invention. The deep hole drill 1 includes a segment type shank 2, a segment type drill body 3 connected to a front portion of the shank 2, and a screwing member (hereinafter, referred to as a fastening bolt) that fastens the drill body 3 and the shank 2. 4) and a cutting edge 6 attached to the tip of the drill body 3 via magnetic force means 5.

The shank 2 is a shank segment 8
And a rear end portion (shank portion) 9a of the rear segment 9. The shank segment 8 is a perforated cylinder,
The tip has a polygonal recess 8a. Rear segment 9
Is a perforated cylinder and has a recess 8a at the rear end of the shank portion 9a.
Is provided with a polygonal convex portion 9b. The shank segment 8 and the rear segment 9 are made of a material having high strength and durability such as alloy tool steel (SKD).

The drill body 3 is formed by connecting the front end portion (drill body portion) 9c of the rear segment 9, the rear taper segment 10, the central segment 11, the front taper segment 12, and the front segment 13 in series. is there. The central segment 11 and the front segment 1
3, the rear taper segment 10 and the front taper segment 12 are made of a member having high strength and durability such as alloy tool steel (SKD).

The drill body 9c has a polygonal recess 9d at its tip. The rear taper segment 10 forms a truncated cone and has a polygonal convex portion 10a at the rear end that fits into the concave portion 9d. Further, the rear taper segment 10 is
The tapered portion 10b is provided with four cutting tips 14 at equal intervals, and the tip is provided with a polygonal recess 10c. The central segment 11 is a perforated cylinder, and has a polygonal convex portion 11a fitted into the concave portion 10c at the rear end and a polygonal concave portion 11b at the tip.

The front taper segment 12 has a polygonal convex portion 12a at the rear end. Further, the front taper segment 12 has four cutting tips 15 ... Arranged at equal intervals in the taper portion and has a polygonal recess 12c at the tip. The front segment 13 is a perforated cylinder, and has a polygonal convex portion 13a fitted into the concave portion 12c at the rear end and a polygonal concave portion 13b at the tip.

The fastening bolt 4 is made of a high toughness member such as a carburized material, and is composed of a bolt head 4a fitted in the polygonal recess 13b of the front segment 13 and a threaded portion 4b at the tip. Become. The fastening bolt 4 penetrates the front segment 13, the front taper segment 12, the central segment 11, the rear taper segment 10, the rear segment 9 and the shank segment 8.

The bolt head 4a is provided with one magnet 5a of the magnetic force means 5. The magnet 5a is Nb-Fe which is a rare earth magnet.
-B type magnets and Sm-Co type magnets are preferable, and Sm-Co type magnets are preferable from the viewpoint of durability. 17 is a flat spring. The cutting edge 6 has a polygonal convex portion 6a at the rear end,
The convex portion 6 a is a polygonal concave portion 13 of the front segment 13.
Insert into b. At the rear end of the convex portion 6a, the other magnet 5b (magnetic force unit 5) attracted to the magnet 5a is provided. Magnet 5b
Is a rare earth magnet, like the magnet 5a.
-B system magnet, Sm-Co system magnet, etc. are used.

These cutting edges 6, front segment 13,
The front taper segment 12, the central segment 11, the rear taper segment 10, the rear segment 9 and the shank segment 8 are provided with cooling water passages 20 ...
The cooling water flow passages 20 communicate with the cooling water flow passages 21 of the front taper segment 12 and the cooling water flow passages 22 of the rear taper segment 10. Further, the fastening bolt 4 is provided with cooling water flow paths 23 ... Which guide cooling water to the magnets 5a and 5b of the magnetic force means 5.

FIG. 2 is a front view of the rear taper segment shown in FIG. As described above, in the rear taper segment 10, four cutting tips 14 ... Are arranged at equal intervals in the taper portion 10b, and a polygonal (hexagonal) concave portion 10 is provided at the tip.
with c. Further, the rear taper segment 10 is provided with cooling water passages 20 ... At an interval of 90 ° on the inner circumference, and is provided with cooling water passages 22 ... Which communicate with the cooling water passages 20 ...

FIG. 3 is a sectional view taken along line 3-3 of FIG. The rear taper segment 10 is provided with screws 26 in the state where the cutting tips 14 are arranged above the position adjusting screw 25.
It is attached to 0b. As a result, the cutting tip 14 is rotated by rotating the position adjusting screw 25 and moving it up and down.
The amount of protrusion of ... is adjusted.

Deep hole drill according to the present invention (first embodiment)
The assembling procedure will be described. FIG. 4 is an exploded view of a deep hole drill (first embodiment) according to the present invention. First, the fastening bolt 4 is attached to the front segment 13 and the front taper segment 1.
2, central segment 11, rear taper segment 10,
The rear segment 9 and the shank segment 8 are sequentially penetrated, and the penetrated member is pressed against the bolt head 4a side of the fastening bolt 4.

As a result, the bolt head 4 of the fastening bolt 4
a fits in the recess 13b. At the same time, the convex portion 13 a of the front segment 13 and the concave portion 1 of the front taper segment 12
2c is fitted, and the projection 12 of the front taper segment 12
The a and the recess 11b of the central segment 11 are fitted together. Further, the convex portion 11a of the central segment 11 and the concave portion 10c of the rear tapered segment 10 are fitted together, and the convex portion 10a of the rear tapered segment 10 and the concave portion 9d of the rear segment 9 are fitted together. Further, the convex portion 9b of the rear segment 9 and the concave portion 8a of the shank segment 8 are fitted to each other, so that the screw portion 4b of the fastening bolt 4 projects from the shank segment 8.

Next, the threaded portion 4b of the fastening bolt 4 protruding from the shank segment 8 is tightened with the nuts 16 and 16, and the front segment 13 and the front taper segment 1 are attached.
2, central segment 11, rear taper segment 10,
The rear segment 9 and the shank segment 8 are fastened together. Next, the magnet 5b attached to the convex portion 6a of the cutting edge 6 is attracted to the magnet 5a of the bolt head 4a and joined to the tip portion of the front segment 13. As a result, the deep hole drill 1 is assembled into the state shown in FIG.

Work (not shown) with this deep hole drill 1
When deep hole machining is performed, the cooling water guided by the cooling water flow path 20 is supplied to the tip of the cutting edge 6 or the processing surface, and the cooling water flow path 23
The cooling water guided by ... is supplied to the magnets 5a and 5b of the magnetic force means 5. Also, the shank segment 8 and the nut 16,
Since the counter springs 17 are arranged between the tightening bolt 4 and the front segment 13, the front taper segment 12, the center segment 11, the rear taper segment 10, the rear segment 9 and the shank during the machining of the deep hole. Even if a thermal expansion difference occurs with the segment 8, the thermal expansion difference can be absorbed.

FIGS. 5A to 5C are perspective views showing modified examples of the cutting edge according to the present invention. The cutting edge of (a) is formed by forming the convex portion at the rear end into a rectangular shape. In this case, the front segment 1 into which the protrusion 6a is fitted
The concave portion 13b of No. 3 is formed in a rectangular shape. Therefore, the cutting edge 6 rotates integrally with the front segment 13 during deep hole machining.

In (b), the convex portion at the rear end of the cutting edge is formed in a hexagonal shape. In this case, the concave portion 13b of the front segment 13 into which the convex portion 6a is fitted is formed in a hexagonal shape.
Therefore, when drilling deep holes, the cutting edge 6 is used as in the case of (a).
Rotate integrally with the front segment 13.

(C) is a projection in which the rear end of the cutting edge 6 is formed in a triangular shape. In this case, the concave portion 13b of the front segment 13 into which the convex portion 6a is fitted is formed in a triangular shape. Therefore, during deep hole machining, the cutting edge 6 rotates integrally with the front segment 13 as in the cases (a) and (b).

6 (a) and 6 (b) are explanatory views of the operation when the cutting edge according to the present invention is removed. (A) shows a state in which the removal bolt is screwed into the screw hole formed at the tip of the front segment 13. In this case, the removal bolt 28 has a screw hole 29 at the front end of the front segment 13.
Since it does not project from the above, the magnet 5b of the cutting edge 6 is attracted to the magnet 5a of the bolt head 4a. This makes the cutting edge 6
Keeps attached to the tip of the front segment 13.

(B) shows a state in which the magnetic force means is separated by the removal bolt screwed into the screw hole of the front segment. That is, by turning the removal bolt 28 screwed into the screw hole 29 of the front segment 13 with the tool 30 in the tightening direction,
The tip of the detaching bolt 28 is projected from the screw hole 29, and the rear end of the cutting edge 6 is pushed forward (in the arrow direction). This allows the magnet 5a to be pulled away from the magnet 5b and the cutting edge 6 to be removed from the front segment 13.

Although the deep hole drill for stepping has been described in the first embodiment, the present invention is not limited to this, and the present invention is the second one in FIG.
As shown in the embodiment, it can be applied to a straight deep hole drill. FIG. 7 is a sectional view of a deep hole drill (second embodiment) according to the present invention. In FIG. 7, the same members as those of the first embodiment are designated by the same reference numerals and the description thereof will be omitted. The deep hole drill 32 includes a segment type shank 33, a segment type drill body 34 connected to the front portion of the shank 33, a fastening bolt 4 for fastening the drill body 34 and the shank 33, and the drill body 3.
4 and a cutting edge 6 attached to the tip of the magnetic recording medium via magnetic force means 5.

The shank 33 is the shank segment 3
5 and the rear end portion (shank portion) 36 of the rear segment 36
a. The shank segment 35 is a perforated cylinder, and has a polygonal recess 35a at its tip. The rear segment 36 is a perforated cylinder, and has a polygonal convex portion 36b fitted in the concave portion 35a at the rear end of the shank portion 36a.

The drill body 34 includes a rear segment 36.
The front end portion (drill body portion) 36c, the central segment 37, and the front segment 38 are connected in series. The drill body portion 36c has a polygonal concave portion 3 at the tip.
6d is provided. The central segment 37 is a perforated cylinder, and has a polygonal convex portion 37a that fits into the concave portion 36d at the rear end.
And a polygonal recess 37b at the tip. The front segment 38 is a perforated cylinder, and has a polygonal convex portion 38a that fits into the concave portion 37b at the rear end and a polygonal concave portion 38b at the tip. The fastening bolt 4 is provided in the recess 38b.
The bolt head 4a of is fitted.

In the first and second embodiments, the case where the head of the fastening bolt is attached to the front has been described, but the present invention is not limited to this, and the present invention is as shown in the third embodiment of FIG. The bolt head can be mounted with the head facing backward. FIG. 8 is a sectional view of a deep hole drill (third embodiment) according to the present invention. In FIG. 8, the same members as those of the first embodiment are designated by the same reference numerals and the description thereof will be omitted. The deep hole drill 40 includes a segment type shank 2, a segment type drill body 41 connected to the front part of the shank 2, fastening bolts 42 for fastening the drill body 41 and the shank 2, and a tip of the drill body 41. Magnetic means 5
And a cutting edge 6 attached via.

The drill body 41 is formed by connecting the front end portion (drill body portion) 9c of the rear segment 9, the rear taper segment 10, the central segment 11, the front taper segment 12, and the front segment 43 in series. is there.

The front segment 43 is a perforated cylinder,
The rear end is provided with a polygonal convex portion 43a that fits into the concave portion 12c, and the front end is provided with a polygonal concave portion 43b. A female screw (see FIG. 9) 43c to which the tip of the fastening bolt 42 is screwed is provided at the rear end of the front segment 43.

The fastening bolt 42 penetrates the shank segment 8, the rear segment 9, the rear taper segment 10, the central segment 11 and the front taper segment 12, and the tip of the fastening bolt 42 has a female thread of the front segment 43. (See FIG. 9) A screw portion 42b that is screwed to 43c is provided.

Deep hole drill according to the present invention (third embodiment)
The assembling procedure will be described. FIG. 9 is an exploded view of a deep hole drill (third embodiment) according to the present invention. First, on the fastening bolt 42, the shank segment 8, the rear segment 9,
The tip portion of the fastening bolt 42 is threadedly connected to the female screw 43 c of the front segment 43 by penetrating the rear taper segment 10, the central segment 11 and the front taper segment 12.

As a result, the shank segment 8, the rear segment 9, the rear taper segment 10, the central segment 11, the front taper segment 12 and the front segment 43 are integrally fastened. Next, the magnet 5b attached to the convex portion 6a of the cutting edge 6 is attracted to the magnet 5a of the front segment 43 and the cutting edge 6 is attached to the tip of the front segment 43.
Attach. As a result, the deep hole drill 40 is integrally assembled in the state shown in FIG.

In the first to third embodiments, the case where each segment is integrally fastened with the fastening bolt has been described.
The present invention is not limited to this, and each segment may be attached by magnetic force means to integrally assemble the deep hole drill.

[0041]

The present invention has the following effects due to the above configuration. According to the first aspect of the present invention, since the cutting edge is detachably attached to the drill body by the magnetic means, the cutting edge can be easily attached and detached, and the cutting edge can be replaced in a short time. Also, by using magnetic means to attach the cutting edge,
The cutting edge can be attached with a simple structure.
Therefore, the cost of the deep hole drill can be reduced.

Since the drill body is divided into a plurality of segments, if a part of the drill body is damaged, it is possible to replace only the damaged segment without replacing the entire drill body. Therefore, the drill body can be effectively utilized. In addition, when the deep hole drill is manufactured from a sintered material by dividing it into segments, it can be manufactured by dividing it into a size suitable for molding, firing, and processing. As compared with the case of manufacturing, the yield can be increased by preventing cracks during molding, deformation and cracks during firing, cracks during processing, and the like. Therefore, the manufacturing cost can be reduced.

According to the third aspect of the present invention, each segment of the drill body is detachably fastened by magnetic force, so that each segment can be easily attached and detached.

According to the fourth aspect of the present invention, since each segment of the drill body is detachably fastened with the screw member, each segment can be connected to the connection. Further, by using a material having high toughness for the screwing member, the toughness at the center of the deep hole drill can be increased and the safety can be improved.

According to a fifth aspect of the present invention, the drill body and the shank are provided with a flow passage, and cooling water is supplied from the flow passage to cool the working portion, the drill cutting edge portion and the magnetic force means. Therefore, the thermal expansion of the magnetic force means can be prevented, the accuracy of drilling by the cutting edge is improved, and the durability of the cutting edge is also improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a deep hole drill (first embodiment) according to the present invention.

2 is a front view of the rear taper segment shown in FIG. 1. FIG.

3 is a sectional view taken along line 3-3 of FIG.

FIG. 4 is an exploded view of a deep hole drill (first embodiment) according to the present invention.

FIG. 5 is a perspective view showing a modified example of the cutting edge according to the present invention.

FIG. 6 is an operation explanatory view when the cutting edge according to the present invention is removed.

FIG. 7 is a sectional view of a deep hole drill (second embodiment) according to the present invention.

FIG. 8 is a sectional view of a deep hole drill (third embodiment) according to the present invention.

FIG. 9 is an exploded view of a deep hole drill (third embodiment) according to the present invention.

FIG. 10 is a side view of a conventional deep hole drill.

FIG. 11 is a side view of a conventional stepped deep hole drill.

[Explanation of symbols]

1, 32, 40 ... drills for deep holes, 2,33 ... shanks,
3, 34, 41 ... Drill body, 4, 42 ... Fastening bolt (fastening means), 5 ... Magnetic force means, 6 ... Cutting edge, 8, 35 ...
Shank segment, 9, 36 ... Rear segment, 1
0 ... Rear taper segment, 11, 37 ... Central segment, 12 ... Front taper segment, 13, 43 ... Front segment, 20, 21, 22, 23 ... Cooling water flow path.

Front page continuation (72) Inventor Tetsuya Oishi 1-10-1 Shin-Sayama, Sayama City, Saitama Prefecture Honda Engineering Co., Ltd.

Claims (5)

[Claims] 1. A drill body is connected to the front of the shank,
A deep hole drill in which a cutting edge is formed at the tip of the drill body, wherein the cutting edge is detachably attached to the drill body via magnetic means. 2. The deep hole drill according to claim 1, wherein the drill body is divided into a plurality of segments, and the segments are detachably fastened by fastening means. 3. The deep hole drill according to claim 2, wherein the fastening means is a magnetic force. 4. The deep hole drill according to claim 2, wherein the fastening means is a threaded member, and the threaded member is communicated with each segment to fasten each segment in series. 5. The drill body and the shank are provided with a cooling water passage, and the cooling water supplied from the passage cools the magnetic force means, the processing portion, and the drill portion. The deep hole drill according to claim 1 or claim 2.