JPH0329063Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Use and Target of the Invention) The present invention relates to a rotary cutting unit consisting of a combination of a rotary cutting tool such as a drill or an end mill, and a chamfering tool.

(Prior art) In order to obtain a chamfered hole or a cutting step surface with a chamfered corner between the surface and the surface, the corner of the hole or step surface cut with a general-purpose drill or end mill must be cut with another counterbore or chamfer. Generally speaking, chamfering is performed using a rotary cutting tool for chamfering, or a dedicated rotary cutting tool that can perform chamfering at the same time, such as a stepped drill, is used, but the former method is extremely inefficient. Unfortunately, the latter method requires expensive special tools, making it difficult to utilize when machining of various sizes is required.

[Problems to be solved by the invention] The purpose of the invention is to solve these problems, and by combining a general-purpose drill or end mill with a chamfering tool and setting it in a holder, The technical challenge is to be able to use it as a dedicated cutting tool that can also perform chamfering at the same time.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a chuck main body 1 having a tapered hole 1a at the tip, a tapered portion 2a that can be engaged with the tapered hole, and a tip. A collet 2 having a reverse taper tip 2b formed in a reverse taper with respect to the taper portion, and a rotary cutting tool 3 screwed into the chuck body 1 and inserted into the collet 2 are connected to the chuck body through the collet 2. 1, and a tightening ring 5 having a tapered inner circumferential surface 5a capable of engaging with the reversely tapered tip 2b of the collet 2, the tightening ring 5 is integrally mounted with the tightening nut 4 in the axial direction. A tightening ring 5 that moves but engages with the nut 4 in a relatively rotatable manner, a tool holder 6 that is attached to a mounting portion 9 that is integrally formed and protrudes from the tightening ring in the axial direction, and a tool holder 6 that is attached to the holder. A configuration comprising a chamfering tool 7 for simultaneously chamfering the corners of the cut surface by the rotary cutting tool 3 is adopted.

(Example) In Figures 1 and 2, 1 is a cylindrical chuck body, and the chuck hole at the tip thereof is a tapered hole 1.
Formed in a. 2 has grooves 2c at regular intervals in the circumferential direction.
is formed, and the tapered hole 1 is formed on most of its outer peripheral surface.
This collet is formed with a tapered portion 2a that can be engaged with the tip of the collet a, and a reverse tapered portion 2b that is tapered in the opposite direction to the taper portion 2a at the remaining tip portion.
3 is a rotary cutting tool such as a drill, and naturally the blade part 3
a and a shank portion 3b. 4 is a tightening nut screwed onto the chuck body 1; Reference numeral 5 denotes a tapered inner peripheral surface 5a that can engage with the reversely tapered tip 2b of the collet 2, and an annular groove 2 provided on the outer periphery of the collet 2.
This is a tightening ring having an annular protrusion 5b that rotatably engages with the ring d. The inner circumferential surface of the tightening nut 4 is in contact with the outer circumferential surface of the tightening ring 5, and an engagement ball 8 is rotatably loaded between the two circumferential surfaces, whereby the tightening ring 5 is tightened. Although it is restricted to move in the axial direction together with the nut 4, it is engaged with the nut 4 so that it can rotate freely relative to the nut 4. Reference numeral 6 denotes a tool holder attached to the tightening ring 5, and the holder is screwed into a mounting screw portion 9 integrally formed with the tightening ring 5 so as to protrude in the axial direction, as shown in FIG. mounted on. A chamfering tool mounting hole 6a is provided in the tip of the cutting tool holder 6 in an oblique direction (for example, 45 degrees), and a chamfering tool 7 is inserted into this hole, and the chamfering tool 7 is inserted perpendicularly to the mounting hole 6a as shown in FIG. The chamfering tool 7 is fixed to the tool holder 6 by the fixing screw 10 screwed in.

The cutting tool holder 6 is also provided with pin holes 6b, 6b diagonally (for example, 45°) at 180° intervals, avoiding the mounting position of the chamfering tool 7, and at positions axially retreating from the mounting position of the chamfering tool 7. is installed through the
Cutting waste removal pins 11, 11 are fitted into this, and their tips 11a, 11a are rake surfaces 3d, 3d, which are valleys between cutting blades 3c, 3c, as shown in FIG.
1, the cutting waste removal pin 1 is secured with the fixing screw 12 as shown in FIG.
1 and 11 are fixed to the tool holder 6. In FIG. 2, 13 is a plug that receives the axial load of the rotary cutting tool 3, and is screwed into a female threaded hole 1b provided coaxially with the tapered hole 1a of the chuck body 1.
By changing the screw-in amount in the axial direction, the amount of protrusion of the rotary cutting tool 3 from the chuck body 1 can be freely adjusted, and as a result, the corners of the surface cut by the rotary cutting tool 3 can be chamfered at the same time. The axial mounting position of the chamfering tool 7 and the rotary cutting tool 3 can be freely adjusted from a distance. In FIG. 1, 4a is a power tool insertion hole for screwing the tightening nut 4, and 6c is a power tool gripping surface for screwing the tool holder 6 into the tightening ring 5.

In use, insert the rotary cutting tool 3 into the chuck body 1 until the end face of its shank portion 3b abuts the plug 13 whose position has been adjusted in advance, and then tighten the collet 2 by screwing the tightening nut 4 into the chuck body 1. The rotary cutting tool 3 is tightened and fixed through the rotary cutting tool 3. Note that the tightening position by the collet 2 is not limited to the tool shank portion 3b, and the blade portion 3a may be tightened as shown in the figure. Due to the rotation of the tightening nut 4 when screwed in, the tightening ring 5 moves in the axial direction together with the nut 4 and presses the collet 2, but since it does not rotate and remains in a fixed position, it is not attached to the tool holder 6. The tips 7a and 11a of the chamfering tool 7 and cutting waste removal pin 11, which are installed in advance, are aligned with the predetermined cutting edge 3.
c and the rake face 3d of the cutting blade, and will not be displaced.

After that, the chuck body 1 will be attached to the drive spindle. For example, when attaching it to the drive spindle of a numerically controlled machine tool (NC machine tool) that can automatically change tools using a manipulator, the chuck body 1 will be attached to the drive spindle of the taper shaft part and the manipulator. The chuck body 1 is loaded into a tool holder having a gripping portion for use, and the chuck body 1 is further attached to a drive spindle for use.

Then, when the hole H machined by the drill 3 reaches a predetermined depth by cutting with the drill 3, which is a rotary cutting tool, as shown in FIG. Chamfer cutting is performed by a chamfer cutting tool 7 that rotates together with the drill 3, and a chamfer surface Ha is processed.

Further, as shown in FIG. 4, when the cutting waste t generated by the cutting process with the drill 3 is discharged to the outside along the rake face 3d of the cutting blade 3c, the cutting waste t is transferred to the tool holder 6 and The cutting waste removal pins 11, 11 remove any particles that try to enter the gap between the collet 2 and the cutting tool 3, thereby preventing such intrusion.

(Effects) According to the present invention, by combining conventionally used rotary cutting tools such as drills and end mills with the chamfering tool, it can be used as a special type of rotary cutting tool that can simultaneously perform hole and step machining as well as chamfer machining. It can be used.

Moreover, since the cutting position of the rotary cutting tool used and the axial positional relationship of the chamfering tool can be freely adjusted, it is highly versatile and has great economical effects.

In addition, the rotary cutting unit of the present invention can grip and attach not only the shank part of a rotary cutting tool but also the blade part, so for example, when performing centering cutting on a workpiece material as a pre-processing for hole drilling. If the rotary cutting unit grips the blade near the tip of the rotary cutting tool, it is possible to form an accurate centering hole without runout, and it is possible to form a hole with accurate centering without centering. Since there is no need to replace cutting tools, the number of processes can be reduced accordingly.

Moreover, according to the invention of the present invention, a so-called tightening ring of the collect chuck is used, and a mounting part protruding in the axial direction is integrally formed on the tightening ring, and a tool holder is attached to the mounting part, so that the tightening nut of the collect chuck can be easily tightened. The rotary cutting tool and the chamfering tool attached to the tool holder can be attached to the chuck body at the same time by simply tightening the tool, and there is no need to separately attach the chamfering tool to the chuck body.
The workability is that much better.

Furthermore, as mentioned above, a tightening ring is used that moves in the axial direction together with the tightening nut, but engages with the nut in a relatively rotatable manner, and a chamfering tool is attached to this via a tool holder. Therefore, even when the tightening nut is rotated, the chamfering tool is not displaced in the circumferential direction and is held at a predetermined position, making it possible to perform the chamfering operation extremely accurately.

Furthermore, according to the embodiment of the present invention, the cutting waste removal pin is attached to the cutting tool holder so that the tip of the pin is along the rake surface of the cutting blade of the rotary cutting tool, so that the cutting edge of the cutting tool is removed during the cutting process. The cutting waste discharged along the rake face is removed outwardly by the cutting waste removal pin, and does not enter the gap between the cutting tool holder or the collet and the rotary cutting tool and damage these parts. In particular, cutting debris generated by the rapid rotation of modern carbide drills tends to extend in the axial direction along the drill and be discharged, so it is particularly effective for this type of cutting tool.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing one embodiment of the present invention;
The figure is a longitudinal sectional front view of the same, showing the state in which it is used. Third
The figure is a longitudinal sectional side view of the same main part, and FIG. 4 is a front view for explaining the action of the main part in the same usage state. 1...chuck body, 1a...tapered hole, 2...
...Collection, 2a... Tapered part, 2b... Reverse taper tip, 3... Rotary cutting tool, 4... Tightening nut, 5... Tightening ring, 6... Bit holder, 7... Chamfering bit, 9... ...Mounting part (mounting screw part), 11... Cutting waste removal pin, 11a
...The tip, 3d...The rake surface of the cutting blade.

Claims (1)

[Claims for Utility Model Registration] 1. A chuck body having a tapered hole at its tip;
A collet having a tapered portion that can be engaged with the tapered hole and a reversely tapered tip portion that is tapered inversely to the tapered portion, and a rotary cutting tool that is screwed into the chuck body and inserted into the collet. a tightening nut for tightening and fixing the chuck to the chuck body through the chuck; and a tightening ring having a tapered inner circumferential surface capable of engaging with the reversely tapered tip of the collet, which moves in the axial direction together with the tightening nut. , a tightening ring that engages with the nut in a relatively rotatable manner; a cutting tool holder attached to a mounting portion that projects axially from the tightening ring and is integrally formed; and a cutting surface that is attached to the holder and is cut by the rotary cutting tool. A rotary cutting unit consisting of a chamfering tool and a chamfering tool for simultaneously chamfering the corners of. 2. The rotary cutting unit according to claim 1, wherein a cutting waste removal pin is attached to the cutting tool holder so that the tip thereof is along the rake face of the cutting blade of the rotary cutting tool.