WO2010047158A1

WO2010047158A1 - Deep hole drill

Info

Publication number: WO2010047158A1
Application number: PCT/JP2009/062534
Authority: WO
Inventors: 倬司野村
Original assignee: ユニタック株式会社
Priority date: 2008-10-23
Filing date: 2009-07-09
Publication date: 2010-04-29
Also published as: JP2010099773A

Abstract

A deep hole drill, wherein, even if drive of a spindle stops quickly when processing is competed, stopping rotation of a drill tube, a drill head does not come out of the front end of the drill tube. A drill head (1) mounted to the front end of a drill tube (2) has a rear section having formed thereon a first fitting shaft section (5), a male screw thread section (6), and a second fitting shaft section (7) which have diameters gradually increasing from the rear end side of the rear section to the front side. The front end of the drill tube (2) is provided with a first fitting hole section (8) fitted in a spigot-and-socket manner to the first fitting shaft section (5), a female screw thread section (9) engaged with the male screw thread section (6), and a second fitting hole section (10) fitted in a spigot-and-socket manner to the second fitting shaft section (7). Projections (12) are provided at at least three circumferential positions on the outer peripheral surface of the second fitting shaft section (7) of the drill head (1). When the drill head (1) is mounted to the front end of the drill tube (2), the second fitting shaft section (7) of the drill head (1) is fitted in a spigot-and-socket manner and with interference to the second fitting hole section (10) of the drill tube (2).

Description

Deep hole drill

The present invention relates to a drill used for deep hole cutting, and in particular, a first fitting shaft portion, a male screw portion, and a second fitting from the rear end side to a rear portion of a drill head attached to a tip portion of a drill tube. The shaft portion is sequentially formed to have a large diameter toward the front side, a first fitting hole portion that is in-fitted to the first fitting shaft portion at the distal end portion of the drill tube, a female screw portion that is screwed into the male screw portion, and the first The present invention relates to a drill for deep hole cutting formed by forming a second fitting hole portion that fits in-fitting to a two fitting shaft portion.

In deep hole cutting with a deep hole cutting device, the drill for deep hole cutting with the drill head attached to the tip of the drill tube as described above is connected to the drive shaft of the spindle of the machine tool and rotated. Alternatively, by rotating the work material side, the work material is cut with a cutting blade of a drill head to form a deep hole.

In deep hole machining, the drill side is rotated as described above, or the work material side is rotated to open a deep hole in the work material. This is a problem when rotating the side. In other words, when deep hole machining is performed by rotating the drill side at a high speed with the work material fixed, when the deep hole penetrates and the deep hole machining is completed, the spindle of the machine tool is braked and the drill is applied. When the rotation of the tube suddenly stops, a relative rotation occurs between the drill head that has been rotating at a high speed and the drill tube, and the drill tube is reversed. There is a problem that the part where the drill head and the drill tube which have fallen out are often worn out and worn out, so that they cannot be reused.

In view of the above circumstances, the present invention prevents the drill head from falling off the tip of the drill tube even if the spindle drive stops suddenly at the end of deep hole machining and the drill tube stops rotating. An object is to provide a drill for deep hole cutting.

Means for solving the above problems will be described with reference numerals in the embodiments described later. The invention according to claim 1 is directed to the rear part of the drill head 1 attached to the tip part of the drill tube 2. The first fitting shaft portion 5, the male screw portion 6 and the second fitting shaft portion 7 are formed in order from the side toward the front side, and the drill tube 2 is indented into the first fitting shaft portion 5 at the distal end portion. A depth formed by forming a first fitting hole portion 8 to be fitted, a female screw portion 9 to be screwed to the male screw portion 6, and a second fitting hole portion 10 to be in-fitted to the second fitting shaft portion 7. In drill for drilling holes,
On the outer peripheral surface of the second fitting shaft portion 7 of the drill head 1, projections 12 are provided in at least three locations in the circumferential direction, and the second fitting of the drill head 1 is performed when the drill head 1 is attached to the tip of the drill tube 2. The shaft portion 7 is characterized in that it is in-row fitted to the second fitting hole 10 of the drill tube 2 in an interference fit state.

According to a second aspect of the present invention, in the deep hole cutting drill according to the first aspect, the first fitting shaft portion 5 outer peripheral surface of the drill head 1 has protrusions 11 protruding from at least three locations in the circumferential direction. 2 Protrusions 12 project from the outer peripheral surface of the fitting shaft 7 at at least three locations in the circumferential direction, and the first fitting shaft 5 of the drill head 1 is attached when the drill head 1 is attached to the tip of the drill tube 2. And the 2nd fitting shaft part 7 was made to carry out the in-row fitting to the 1st fitting hole part 8 and the 2nd fitting hole part 10 of the drill tube 2 in the interference fitting state, respectively.

According to a third aspect of the present invention, in the deep hole cutting drill according to the second aspect, at least three

protrusions

11 and 12 protruding from the first fitting shaft portion 5 and the second fitting shaft portion 7 are fitted. It is characterized in that it is provided on the outer peripheral surface of the shaft portion at substantially equal intervals.

According to a fourth aspect of the present invention, in the deep hole cutting drill according to the second aspect, the protrusion 11 on the first fitting shaft portion and the protrusion 12 of the second fitting shaft portion do not overlap each other in the axial direction. And are provided at positions separated from each other in the circumferential direction.

According to a fifth aspect of the present invention, in the deep hole cutting drill according to the second aspect, by using a marking punch, the first and second

fitting shaft portions

5 and 7 are driven into predetermined positions on the outer peripheral surface. At the same time that the concave portion O is formed at a predetermined position on the outer peripheral surface of the outer peripheral surface of the first and second

fitting shaft portions

5, 7, the peripheral portion of the concave portion O is raised, and this raised portion is the first and second raised portions. The

protrusions

11 and 12 of the fitting shaft portion are characterized in that they are formed.

According to a sixth aspect of the present invention, in the deep hole cutting drill according to the second aspect, the protruding heights of the

projections

11 and 12 from the outer peripheral surfaces of the

fitting shafts

5 and 7 are the first fitting shaft 5 and the first The second fitting shaft portion 7 is formed to have a height that can be sufficiently tightly fitted to the first fitting hole portion 8 and the second fitting hole portion 10 of the drill tube.

According to a seventh aspect of the present invention, in the deep hole cutting drill according to the second aspect, when the lower side of the drill head 1 is fitted into the tip of the drill tube 2, the male screw portion 6 of the drill head 1 becomes the female screw portion of the drill tube 2. 9, and the first fitting shaft portion 5 is in-fitted with the first fitting shaft portion side while being fitted in the first fitting hole portion 8 in the middle of the screwing. At the same time, the second fitting shaft portion 7 is fitted into the second fitting hole portion 10 while being in-row fitted with the projection portion 12 on the second fitting shaft portion side to be in an interference fit state.

According to an eighth aspect of the present invention, in the deep hole cutting drill according to the second aspect, the

protrusions

11 and 12 projecting from the outer peripheral surface of the first fitting shaft portion 5 and the outer peripheral surface of the second fitting shaft portion 7. Is formed by a group of a plurality of

small protrusion groups

11a and 12a.

According to a ninth aspect of the present invention, in the deep hole cutting drill according to the second aspect, a knurled roller is pressed against a required portion of the outer peripheral surface of the first fitting shaft portion 5 and the second fitting shaft portion 7 by knurling. The oblique grooves or the lattice-like grooves are formed by manufacturing, and at the same time, the swelled parts are formed as the

protrusions

11 and 12 of the first and second fitting shafts.

According to a tenth aspect of the present invention, in the deep hole cutting drill according to the second aspect, a small concave portion is formed by laser irradiation on a required portion of the outer peripheral surface of the first fitting shaft portion 5 and the second fitting shaft portion 7 by laser marking. Simultaneously with the formation, the periphery of the concave portion is raised, and the raised portion becomes the

protrusions

11 and 12 of the first and second fitting shaft portions.

The effect of the invention by the above-described solution means will be described with reference numerals of embodiments to be described later. According to the invention according to claim 1, the drill head 1 is a second fitting hole close to the tip of the drill tube 2. Since the second fitting shaft portion 7 to be fitted with the portion 10 is in-row fitted into the second fitting hole portion 10 by the projection portion 12 in an interference fit state, and firmly joined to the drill tube 2, When deep hole machining is performed by rotating the drill side at a high speed while the work material is fixed, the spindle is braked at the end of the deep hole machining to stop the drive, and the drill tube 2 stops rotating. Then, the drill head 1 can also be stopped integrally with the drill tube 2, so that the drill head 1 does not fall off from the tip of the drill tube 2, and the drill head 1 and the drill tube 2 Wear parts without, it can be used as it is.

According to the second aspect of the invention, the drill head 1 includes the first fitting hole portion 8 of the drill tube 2 in which the first fitting shaft portion 5 and the second fitting shaft portion 7 both have the

projections

11 and 12. And the second fitting hole 10 are in-row fitted in an interference-fitted state, so that the drill tube 2 is more firmly and integrally joined. Therefore, when the deep hole machining is finished, the spindle The drill head 1 can be more reliably prevented from falling off from the tip of the drill tube 2 when driving is stopped.

The effects of the invention of claim 3 and below will become apparent from the detailed description of the specification.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a partially sectional explanatory view showing a drill head and a tip side portion of a drill tube to which the drill head is attached, and FIG. It is a partial cross section explanatory view in the state where a drill head was attached to. In these drawings, 1 is a drill head, and 2 is a drill tube. The drill head 1 and the drill tube 2 constitute a deep hole cutting drill.

A center side cutting blade 3a, an outer peripheral side cutting blade 3b, and an intermediate side cutting blade 3c are attached to the hollow head main body 1a of the drill head 1 on the front end surface side, respectively. Guide pads 4 are attached at two locations. A first fitting shaft portion 5, a male screw portion 6, and a second fitting shaft portion 7 are sequentially formed in the rear portion of the head main body 1a from the rear end side to the front side in order of diameter.

A drill tube 2 has a distal end portion of a first fitting hole portion 8 which is in-row fitted to the first fitting shaft portion 5, a female screw portion 9 which is screwed to the male screw portion 6, and the second fitting shaft portion 7. A second fitting hole 10 is formed to fit in-line. In addition, a wide hole 13 having a diameter larger than that of the second fitting hole 10 is formed at the tip of the drill tube 2 on the tip side of the second fitting hole 10.

And the protrusion part 11 is protrudingly provided in three places of the circumferential direction on the outer peripheral surface of the 1st fitting shaft part 5 of the drill head 1, and the circumferential direction 3 is also provided in the outer peripheral surface of the 2nd fitting shaft part 7. FIG. Protrusions 12 are provided at locations where the first fitting shaft portion 5 and the second fitting shaft portion 7 of the drill head 1 are attached to the drill tube 2 when the drill head 1 is attached to the tip of the drill tube 2. The first fitting hole 8 and the second fitting hole 10 are in-row fitted in an interference fit state.

The protrusions 11 are formed at intervals of approximately 120 degrees on the outer peripheral surface of the first fitting shaft portion 5, and the protrusions 12 are spaced approximately 120 degrees on the outer peripheral surface of the second fitting shaft portion 7. It is formed every other. In this case, the protrusion 11 on the first fitting shaft 5 side and the protrusion 12 of the second fitting shaft 7 do not overlap each other in the axial direction as shown in FIG. By being provided at the position, the in-row fitting operation of the drill head 1 with respect to the drill tube 2 is facilitated as compared to the case where the protrusion 11 and the protrusion 12 overlap in the axial direction.

The

protrusions

11 and 12 are formed by driving in predetermined locations on the outer peripheral surfaces of the first and second

fitting shaft portions

5 and 7 using a marking punch. 3A is an enlarged view of the portion indicated by arrow A in FIG. 1, and FIG. 3B is a cross-sectional view taken along the line BB of FIG. 3A. When the portion is vertically applied to a predetermined portion of the outer peripheral surface of the first fitting shaft portion 5 and hit with a hammer, a concave portion O is formed at the predetermined portion of the outer peripheral surface, and at the same time, the peripheral portion of the concave portion O is raised. The raised portion becomes the protruding portion 11. The protruding portion 12 of the second fitting shaft portion 7 is also formed by the same method as the protruding portion 11.

The protrusion height of each

projection

11, 12 from the outer peripheral surface of the

fitting shaft

5, 7 is such that the first fitting shaft 5 and the second fitting shaft 7 have the first fitting hole 8 of the drill tube 2. The height of the second fitting hole 10 is sufficiently high so that the second fitting hole 10 can be tightly fitted, for example, several tens of microns.

FIG. 2 shows a state in which the drill head 1 having the protruding

portions

11 and 12 protruding from the first fitting shaft portion 5 and the second fitting shaft portion 7 is attached to the distal end portion of the drill tube 2 as described above. When the lower side of the drill head 1 is fitted into the tip of the drill tube 2, first, the male screw portion 6 of the drill head 1 is screwed into the female screw portion 9 of the drill tube 2, and in the middle of the screwing, While the first fitting shaft portion 5 is fitted in the first fitting hole portion 8 in-row, the projection portion 11 makes an interference fit, and the second fitting shaft portion 7 is fitted in the second fitting hole portion 10 in-row. The projecting portion 12 is in an interference-fitting state while being joined, and finally the drill head 1 is firmly joined to the drill tube 2 integrally.

As described above, the drill head 1 attached to the distal end portion of the drill tube 2 has the first fitting shaft portion 5 and the second fitting shaft portion 7 having the first fitting holes of the drill tube 2 by the

projections

11 and 12. Since it is in-row fitted to the part 8 and the second fitting hole part 10 in an interference fit state and firmly joined to the drill tube 2, the drill side is rotated at a high speed while the work material is fixed. When the deep hole machining is performed, if the spindle stops driving at the end of the deep hole machining and the rotation of the drill tube 2 stops, the drill head 1 can also be stopped integrally with the drill tube 2, and therefore the drill head 1 Does not fall off from the tip of the drill tube 2, and the drill head 1 and the drill tube 2 can be used as they are because there are no wear points.

In the embodiment shown in FIGS. 1 and 2, one protrusion 11 is provided at each of three locations in the circumferential direction on the outer peripheral surface of the first fitting shaft portion 5 and the outer peripheral surface of the second fitting shaft portion 7. In FIG. 4,

protrusions

11 and 12 are provided on the outer peripheral surface of the first fitting shaft portion 5 and the outer peripheral surface of the second fitting shaft portion 7 so as to protrude in three circumferential directions. Shows an embodiment formed by a group of a plurality of

small protrusion groups

11a, 12a.

Further, in the embodiment shown in FIGS. 1 to 4, the

protrusions

11 and 12 protrude from both the first fitting shaft portion 5 and the second fitting shaft portion 7. Even if the projection 11 is provided only on the second fitting shaft 7 of the drill head 1 that is in-row fitted with the second fitting hole 10 close to the side, the effect of the interference fitting by the projection 11 is sufficiently exhibited. be able to.

Moreover, although the

projection parts

11 and 12 may be provided so that it may extend over the perimeter of the

fitting shaft parts

5 and 7, as shown in this embodiment, three places of the

fitting shaft parts

5 and 7 outer peripheral surface If they are provided at almost equal intervals, sufficient effects can be exhibited.

Further, in the embodiment shown in FIGS. 1 to 4, the

protrusions

11 and 12 are formed by punching in which the outer peripheral surfaces of the

fitting shafts

5 and 7 are driven using a marking punch. In addition to punching, the protrusions can be formed by knurling or laser marking.

FIG. 5A schematically shows an example in which the protrusion 12 is formed on the second fitting shaft 7 of the drill head 1 by knurling. That is, this is because a jagged roller is pressed against a required portion of the outer peripheral surface of the second fitting shaft portion 7 to form an oblique grid-like concave groove 12b by rolling, and at the same time, a protruding portion is formed by forming the concave groove. This is part 12. FIG. 5 (b) shows a grid-shaped groove 12c formed in the axial direction by pressing a gear-shaped roller against a required portion of the outer peripheral surface of the second fitting shaft portion 7 to form an axial lattice-shaped groove 12c. The bulging portion due to the formation of 12c is the protruding portion 12.

As for the formation of the protrusion by laser marking, for example, a small recess is formed by laser irradiation at a required position on the outer peripheral surface of the second fitting shaft portion 7, and at the same time, the periphery of the recess is raised and raised. This is a method of forming a protrusion by a portion.

It is a partial cross section explanatory view showing a drill head and a tip side portion of a drill tube to which this is attached. It is a partial cross section explanatory view in the state where a drill head was attached to a drill tube tip part. 1 shows an embodiment in which a protrusion is formed on the outer peripheral surface of a fitting shaft by punching, (a) is an enlarged view of a portion indicated by arrow A in FIG. 1, (b) is (a) BB line of It is sectional drawing. It is a front view which shows other embodiment which formed the projection part in the outer peripheral surface of the 1st and fitting shaft part. (a), (b) is a front view of an embodiment in which a protrusion is formed on the outer peripheral surface of the fitting shaft by knurling.

DESCRIPTION OF SYMBOLS 1 Drill head 2 Drill tube 5 1st fitting shaft part 6 Male thread part 7 2nd fitting shaft part 8 1st fitting hole part 9 Female thread part 10 2nd fitting hole part 11 Protrusion part 12 Protrusion part

Claims

At the rear part of the drill head attached to the tip part of the drill tube, the first fitting shaft part, the male thread part and the second fitting shaft part are formed in order from the rear side to the front side in order to increase the diameter. Includes a first fitting hole portion that is in-row fitted to the first fitting shaft portion, a female screw portion that is screwed to the male screw portion, and a second fitting hole portion that is in-row fitted to the second fitting shaft portion. In a deep hole cutting drill formed by forming
On the outer peripheral surface of the second fitting shaft portion of the drill head, protrusions are projected at at least three locations in the circumferential direction. When the drill head is attached to the tip of the drill tube, the second fitting shaft portion of the drill head is the drill tube. A deep hole cutting drill adapted to be in-row fitted in an interference fit state with respect to the second fitting hole.
Protrusions project from at least three locations in the circumferential direction on the outer peripheral surface of the first fitting shaft portion of the drill head, and projecting portions project from at least three locations in the circumferential direction on the outer peripheral surface of the second fitting shaft portion. When the drill head is attached to the tip of the drill tube, the first fitting shaft portion and the second fitting shaft portion of the drill head are located with respect to the first fitting hole portion and the second fitting hole portion of the drill tube. The deep hole cutting drill according to claim 1, wherein each of the drills is in-row fitted in an interference fit state.
3. The deep hole according to claim 2, wherein at least three protrusions provided on the first fitting shaft portion and the second fitting shaft portion are provided at substantially equal intervals on the outer peripheral surface of the fitting shaft portion. Cutting drill.
3. The deep hole according to claim 2, wherein the protrusion on the first fitting shaft portion side and the protrusion on the second fitting shaft portion are provided so as not to overlap each other in the axial direction but apart from each other in the circumferential direction. Cutting drill.
By using a marking punch to drive into the predetermined locations on the outer peripheral surfaces of the first and second fitting shaft portions, a recess is formed at a predetermined location on the outer peripheral surface of the projection, and at the same time the peripheral portion of the recess is raised. The deep hole cutting drill according to claim 2, wherein the raised portion is formed as a projection of each of the first and second fitting shaft portions.
The protrusion height of the protrusions from the outer peripheral surface of the fitting shaft portion is such that the first fitting shaft portion and the second fitting shaft portion are relative to the first fitting hole portion and the second fitting hole portion of the drill tube. The deep hole cutting drill according to claim 2, wherein each of the drills has a height enough to be sufficiently fitted.
When the lower side of the drill head is fitted into the tip of the drill tube, the male screw portion of the drill head is screwed into the female screw portion of the drill tube, and the first fitting shaft portion is the first fitting hole in the middle of the screwing. The second fitting shaft portion is fitted into the second fitting hole while the second fitting shaft portion is in-fitted to the second fitting hole portion. The deep hole cutting drill according to claim 2, which is in an interference-fitted state by a protrusion on the side.
3. The deep hole cutting according to claim 2, wherein each of the protrusions protruding from the outer peripheral surface of the first fitting shaft portion and the outer peripheral surface of the second fitting shaft portion is formed by a group of a plurality of small protrusion groups. Drill.
A knurled roller is pressed against a required portion of the outer peripheral surface of the first fitting shaft portion and the second fitting shaft portion by knurling to form an oblique grid-like groove by rolling, and at the same time, the groove is swollen by the formation of the groove. The deep hole cutting drill according to claim 2, wherein the portion is formed as a projection of each of the first and second fitting shafts.
A small recess is formed by laser irradiation at the outer peripheral surface required portions of the first fitting shaft and the second fitting shaft by laser marking, and at the same time, the periphery of the recess is raised, and the raised portion is the first The deep hole cutting drill according to claim 2, wherein the drill is a projection of each of the second fitting shaft portions.