JP3160232B2 - Composite drilling tool - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-hole machining tool for machining a stepped hole, a counterbore, a hole having a tapered entrance, a chamfer, and the like with a single tool.

[0002]

2. Description of the Related Art Conventionally, in stepping processing having a plurality of hole diameters in the axial direction, if the hole processing step is divided and processed, the time required for tool replacement and setting and the processing time increase as the number of steps increases. Also, because many tools are required,
Their management, cost, and the number of tooling required increased,
There was a problem that the place and expense increased and the cost increased. Therefore, a tool having a special shape according to the shape of the workpiece such as a stepped drill is used. For example, Japanese Patent Application Laid-Open
In JP-A-51914, a stepped drill is formed by arranging an exchangeable cutting tool in which a drill is made penetrable and a cutting edge is provided on the outer periphery of a through hole at the tip thereof. However, there is a problem that the axis of the drill and the replacement cutting tool are displaced because the fixing of the drill and the replacement cutting tool is performed by a fixing screw that works in a direction perpendicular to the axis. In addition, there is a problem that when the diameter of the drill changes, the replacement tool must also be changed.

Therefore, as disclosed in Japanese Utility Model Laid-Open No. 2-100719, it is conceivable to provide a disk-shaped cutting tool mounting portion in the middle of a drill and attach a replacement cutting tool to the cutting tool mounting portion. However, in this case, since the cutting tool mounting portion is sandwiched and fixed between the bolt and nut having the hole to be fitted with the drill hole, misalignment occurs and the cutting tool mounting portion is inclined. In addition, there is a problem that the blade cannot be used for high-precision machining or the like, since the replacement blade is merely clamped and fixed to the disk-shaped blade mounting portion with a bolt and nut.

In Japanese Patent Application Laid-Open No. 6-55320, a screw is provided on the outer periphery of a tool, and a cylindrical cutting tool mounting portion having a female screw fitted to the male screw is provided. It is fixed to the mounting surface. However, there is a problem that a commercially available tool cannot be used because of having the screw fitting portion.

[0005]

Further, Japanese Utility Model Application Publication No.
In Japanese Patent No. 9610, a drill fixed to a collet and a chamfering tool through which the drill is movably penetrated are fixed by another collet, and the relative positions of the collet for fixing the drill and the collet for the chamfering tool are moved. An arrangement is disclosed in which the length of the drill and the chamfering tool is changed by changing the length in the axial direction. However, this has a problem that the structure is complicated because two collets are used, and the rigidity of the drill and the chamfering tool is low, so that the axis is out of order.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, the object of the present invention is to provide a simple structure, no deviation of the axis, high compatibility,
An object of the present invention is to provide a multi-hole drilling tool such as a stepped drill that can use a commercially available tool and can perform high-precision machining.

[0007]

According to the present invention, there is provided a rod-shaped member.
A center hole through which a machining tool can pass and a periphery of the center hole tip
Replacement tool having a cutting edge provided on the tool and tool replacement
The cutting tool is located at the tip of a through hole through which a rod-shaped machining tool can penetrate.
Body provided with tapered hole inside and thread on the outside
And a central hole having a tapered surface corresponding to the tapered hole of the main body.
Can be gripped by penetrating the rod-shaped machining tool, and a circumferential groove at the rear end
Spring collet provided on the outer periphery of the body
Female screw and spring collet
Flange to be inserted into the circumferential groove at the rear end and a rod-shaped machining tool can be penetrated
The above object has been attained by providing a composite hole machining tool provided with a nut having a through hole which is made to be capable of being passed through a center hole of the spring collet so that the rod-shaped machining tool can be loosened. Thus, the rod-shaped machining tool such as a drill is fixed with the spring collet to set the axis. Further, the fixing position of the bar-shaped machining tool can be arbitrarily set by the spring collet. Further, a rod-shaped machining tool such as a drill having an arbitrary diameter can be selected within the chucking range of the taper collet.

Further, the main body is provided with a through-hole tip portion at the through-hole tip portion.
Two width portions are provided facing each other around
A plane perpendicular to the axis and a through hole between the widths
Are provided. In addition, the replacement blade has a center hole and a
Into the mounting screw hole
Is provided with a cutting tool base that can be fixed. With this configuration, the two flat portions are fitted to each other, and the rotational force of the replacement blade is received by the two flat portions, and the axial force is received by the flat surface perpendicular to the axis.
Further, since the replacement tool mounting portion is provided on the end face, the main body only needs to be provided with a screw on the outer periphery, and the axial length is short.

[0009]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an example of an embodiment of the present invention, and is a partial sectional view showing a use state, and FIG. 2 is an exploded perspective view. 1 and 2, an exchangeable cutting tool 5 provided with a cutting edge 4 around a tip 3 of a center hole 2 through which a commercially available drill 1 which is an example of a bar-shaped machining tool penetrates is internally provided with a tapered hole 6.
Is fixed to one end of a main body 8 having a through-hole 7 provided with. A spring collet 10 having a tapered surface 9 corresponding to the tapered hole 6 of the main body 8 is inserted in contact with the tapered hole of the main body so that the drill 1 can be gripped in the center hole 11 of the spring collet. A nut 14 having a flange 13 that can be brought into contact with both ends 12a and 12b of the circumferential groove 12 at the rear end of the spring collet 10 is provided. An internal thread 15 is provided on the nut 14 and is screwed to a male thread 16 provided on the outer periphery of the main body 8. Nut 14
Is provided with a through hole 17 through which the drill 1 penetrates.

[0010] A plane portion 19 perpendicular to the axis having a two-sided width portion 18 at the end of the through hole of the main body 8 and a center hole and a screw hole 2 for mounting in the axial direction.
0 is provided. The replacement blade 5 has a two-sided width portion 18
A tool base 23 having a bottom surface 23a in contact with an end surface 21 and a plane portion 19 perpendicular to the axis is formed, and a blade mounting arm 24 projecting from the tool base is provided.
Has been fixed. Width across flat portion 18 and flat portion 19 of main body 8
The replacement cutting tool 5 is fixed to the main body 8 by fitting the end face 21 and the bottom face 23a of the corresponding cutting tool stand 23 to each other, and screwing the screw 26 into the mounting screw hole 20.

Next, the operation of the present invention having such a configuration will be described. First, assembling of the composite hole machining tool is performed as follows. The replacement blade 5 is attached to the tip of the main body 8, and the spring collet 10 is inserted into the through hole 7 of the main body. The female screw 15 of the nut 14 is screwed into the male screw 16 of the main body 8 and rotated to advance the nut in the direction of the spring collet 10.
The nut flange 13 is fitted into the circumferential groove 12 of the spring collet. As a method of fitting, the rear end of the spring collet may be stepped, the flange 13 may be fitted, and the ring- shaped circumferential groove 12 may be formed on the stepped end face.

Further, when the nut 14 is rotated,
There pushed spring collet 10 in the body 8 in contact with the circumferential groove ends 12a, Na by the reaction force of the spring collet
Can be fixed. Storage and transportation can be performed in this state.
When the nut 14 is rotated in the reverse direction, the flange 13 comes into contact with the circumferential groove end 12b, and the spring collet 10 is pulled out from the main body 8. The replacement cutting tool 5 can be detached at any time.

In use, the drill 1 to be used is inserted into the center hole 11 of the spring collet 10 at a predetermined axial position.
When the nut 14 is rotated and the nut is tightened, the spring collet 10 is inserted into the tapered hole 6 inside the main body 8 and the drill 1.
Is pressed against the outer periphery of the drill, and the drill is fixed at an arbitrary position by frictional force. Further, the position is determined so that the cutting edge 4 of the replacement cutting tool 5 contacts the outer periphery of the drill 1. In addition, after fixing the drill 1, the replacement cutting tool 5 may be fixed to the main body 8 while inserting the replacement cutting tool into the drill 1 and determining the position so that the cutting edge 4 comes into contact with the outer periphery of the drill 1. Further, as long as the drill can be chucked at the rear end, the gripping position of the drill may be the outer peripheral blade portion 1b or the shank portion 1c.

At the time of machining, the shank portion 1a of the drill 1 which penetrates and protrudes from the nut 14 is gripped by a chuck or the like of a rotary machine and is rotated and fed, thereby performing stepped machining such as predetermined chamfering. Since the drill 1 drills in advance, this portion serves as a guide, and even if the cutting edge 4 generates a component force in the side direction, the deviation and vibration of the drill are suppressed, so that stable processing can be performed. To change the drill diameter or the step size, loosen the nut 14 and replace the drill, or change the position of the drill. Also,
The replacement blade 5 can also be appropriately changed, and can immediately respond to a change in the drilling size or shape. Further, in re-grinding the drill cutting blade, the drill 1 and the tool rest 23 are separated and each becomes a single body, so that the re-grinding operation is easy.

1 and 2 show an example of an exchangeable cutting tool in the case of tapered chamfering, various shapes of the cutting edge 4 are possible. For example, FIGS. 3 and 4A show an example of an exchangeable cutting tool in the case of processing a stepped hole, and a cutting edge 4a is provided in a direction perpendicular to the axis. The replacement cutting tool shown in FIG. 4 (b) is provided with a substantially conical cutting blade 4b which recedes toward the axis, and prepares a pre-drilled gypsum board having papers adhered to the surface and finishes the inner surface of the hole. Suitable for. FIG.
The replacement cutting tool (c) is provided with a cutting edge 4c having a conical shape and a surface provided with abrasive grains, and is suitable for drilling and grinding finishing of a chamfered portion. FIG. 4E is a side view of FIG.
(D) The replacement cutting tool shown in (e) is provided with a flat cutting edge 4d in which abrasive is applied to a flat surface of a cylindrical end face, and an inclined surface cutting edge 4e in which abrasive is applied to the outer periphery of the flat cutting edge. It is suitable for grinding removal of a bulge generated around a hole on the surface of a workpiece by drilling of the outer peripheral side drill.

[0016]

As described above, in the present invention,
An exchange blade provided with a cutting edge, a main body provided with the exchange blade, a spring collet fitted into a tapered hole of the main body, and a flange fitted into a circumferential groove of the spring collet.
With the nut acting on the spring collet, the bar-shaped machining tool is gripped by the spring collet,
The shaft center can be easily set, the fixed position of the bar-shaped machining tool can be set arbitrarily, and a bar-shaped machining tool such as a drill with an arbitrary diameter can be selected within the chucking range of the taper collet. Thus, there is provided a multi-hole drilling tool such as a stepped drill, which can be used with a commercially available tool and is capable of high-precision machining, with no misalignment of the shaft center and high compatibility.

Further, a two-sided width portion, a plane perpendicular to the axis, and a screw hole for mounting are provided at the tip end of the main body, and are fitted to the two-sided width part of the replacement blade and brought into contact with the plane perpendicular to the axis for mounting. It is fixed to the screw hole with a screw, the width across flats is fitted to each other, and the rotational force of the replacement blade is received at the width across flats, and the axial force is received at the plane perpendicular to the axis, so that the structure is more It is simple, has high rigidity, and can be processed with high precision. Further, since the length in the axial direction can be shortened, it is easy to secure the shank length of the drill, and rod-shaped machining tools of various lengths can be used.

[Brief description of the drawings]

FIG. 1 is an example of an embodiment of the present invention, and is a partial cross-sectional view illustrating a use state of a composite drilling tool.

FIG. 2 is an exploded perspective view of the composite hole machining tool according to the embodiment of the present invention.

FIG. 3 is a partial cross-sectional view showing a use state of a composite hole machining tool according to another embodiment of the present invention.

FIG. 4 is a perspective view showing another example of the replacement cutting tool according to the embodiment of the present invention. (E) is a side view of (d).

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Rod-shaped machining tool (drill) 2 Center hole 3 Tip 4 Cutting edge 5 Replacement cutting tool 6 Taper hole 7 Through hole 8 Main body 9 Tapered surface 10 Spring collet 11 Center hole of spring collet 12 Circular groove 13 Flange 14 Nut 15 Screw 16 Male screw 17 Through-hole (nut) 18 Two-sided width part 19 Axis-right plane part 20 Mounting screw hole 21 End face 22 Axis-right plane part 23 Blade stand 23a Bottom surface 26 Screw

Claims (2)

(57) [Claims] 1. A center hole through which a rod-shaped machining tool can pass.
And a cutting edge provided around the tip of the center hole.
The tool blade and the tool-changing tool penetrate the bar-shaped machining tool
Provided at the end of the enabled through-hole and internally tapered
And a body having a thread on the outer periphery, and a tapered hole of the body
With a tapered surface corresponding to
Spring with a circumferential groove at the rear end
Gcollet and a male screw provided on the outer periphery of the main body
Female thread to fit and circumferential groove at the rear end of the spring collet
The flange to be fitted and the bar-shaped machining tool
A nut formed of a through-hole and having the rod-shaped machining tool penetrated through the spring collet center hole and capable of being tightened and loosened;
A composite hole machining tool characterized by having: 2. The apparatus according to claim 1, wherein the main body is provided with the through hole at a tip end of the through hole.
The two flat portions provided opposite each other around the hole tip
Provided, a plane perpendicular to the axis and the through hole axial direction between the two width portions.
And a replacement screw hole is provided.
A flat portion having a center hole, fitted to the width across flat portion, and perpendicular to the axis;
And can be fixed to the mounting screw holes with screws.
The composite drilling tool according to claim 1 , further comprising a cutting tool base .