JPH0118260Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to a cutting tool that combines a holder such as an arbor head and a cutter attached to the same, and particularly relates to a cutting tool that is characterized by a tightening mechanism for the cutter.

(b) Prior art and its problems In order to improve the work efficiency when attaching and detaching the milling cutter from the arbor head, a plurality of locking flanges are provided at a fixed pitch around the outer periphery of the washer that is screwed to the arbor head, while the cutter body A flange having a through hole similar in shape to the end view profile of the washer is provided in the center hole of the washer, and the collar of the washer passed through the hole of the flange at a fixed position is engaged with the front surface of the flange by relative rotation with the cutter body. The technique for stopping the engine is well known as the quick change method, and has already been put into practical use.

However, in many conventional cutting tools that employ the above-mentioned tightening mechanism, after passing the collar of the washer through the hole in the flange, the washer or cutter body is rotated by a certain angle, and then the tightening bolt of the washer is operated separately. ,
There was still room for improvement for faster and safer attachment and detachment.

On the other hand, in view of the above, a plate spring or a wire spring is used to apply rotational resistance between the washer and the tightening bolt passed through the hole, and a recess is provided on the washer engagement surface of the cutter body to restrict the rotation of the washer. A technique has also been proposed in which the washer is slipped while the movement is restricted by this concave portion, and then the washer follows the movement of the bolt once the restriction is released, but this method does not apply to all bolts combined with the retainer. The cutter requires complicated machining of recesses, resulting in poor productivity and easy economic waste.

(c) Means for solving the problem The present invention provides a quick-change cutting tool that allows the cutter body to be attached and detached more quickly and accurately, and has excellent workability and maintainability.
The feature is that a convex part is provided on the rear side of the washer that has a locking flange, and on the other hand, on the front side of the holder, the flange provided in the center hole of the cutter body and the locking flange of the washer are in an engaged state. A first recess that accommodates a convex portion on the rear surface of the washer at a certain time, and a second recess that allows rotation of the washer through a certain angle when unfastening is provided, and a compression spring is further interposed between the washer and the retainer. It is located where it is installed.

In this tool, when the tightening bolt is operated, the washer moves in the axial direction and rotates following the movement of the tightening bolt. However, the rotation of the washer is regulated by the two recesses of the holder so that its starting and ending ends are at the tightening position or insertion/extraction position of the washer relative to the cutter body. Therefore, the cutter body can be attached and detached only by operating the bolt.

In addition, since the flange provided in the center hole of the cutter body only needs to have a through hole with a similar shape to the edge view outline of the washer, the cutter is easy to process, and the cutter can also be attached to a general quick-change type holder. It becomes possible.

(iv) Example Hereinafter, an example of the cutting tool according to the present invention and its operation will be described in detail based on the attached drawings.

Reference numeral 1 in FIGS. 1 and 3 indicates the cutter body 10.
It is a holder that has a flange 2 that presses the back surface of the main body 10, a positioning reference boss 3 that is inserted into the center hole 11 of the main body 10, and a detent key 4 that engages with the key groove 12 (see Fig. 3) on the back surface of the main body. A washer 30 is attached to the center via a tightening bolt 20.

The outer periphery of the washer 30 has a fixed pitch of 3 in the circumferential direction.
A flange 14 is provided at the tip of the center hole of the cutter body, and has a through hole 13 having a similar shape to the end view profile of the washer and slightly larger than the washer. Further, on the rear surface side of the washer 30, there is provided a convex portion 32 having an axial height of H and both side surfaces located on a line at an arbitrarily determined angle α.

On the other hand, a protruding part 5 having an annular shape before processing is provided on the front surface of the reference boss of the holder 1, and a part of this protruding part is cut out to accommodate the convex part 32 at an installation angle α {fourth A first recess 6 shown in FIG.

The first recess 6 is in a position to receive the protrusion 32 when the collar 31 of the washer engages with the flange 14 of the cutter body, and the depth from the front surface of the protrusion 5 is greater than H above.

The second recess 7 has a shallower depth in the axial direction than the first recess 6, and has an installation angle β from one end to the terminal end of the washer flange shown in FIG. 4b in the case of the illustrated tool. It is set to approximately 1/2 of the installation angle θ.

Furthermore, as shown in Fig. 3, the holder 1
A compression spring 40 is inserted between the bolt 20 and the washer 30 by being fitted onto the bolt 20.

Note that the key 4 of the holder and the keyway 12 of the main body are
Although the positional relationship may be reversed, they are provided in positions where they engage with each other where the collar 31 of the washer can be inserted and removed from the hole 13 of the flange of the main body.

Next, the operation of attaching and detaching the cutter of the above-mentioned tool will be explained. In this tool, in the tightened state shown in FIG.
The flange 31 of the washer fits into the recess 6, and the flange 31 of the washer
As shown in Figure b, it is located on the non-notched portion of the flange 14 and is in pressure contact with the flange end surface.

To remove the cutter body from this state, it is sufficient to support the body so that it does not fall and loosen the bolt 20.

That is, when the bolt 20 is rotated counterclockwise, the washer 30 is biased by the spring 40, and its convex portion engages with the first recess of the holder, so that the bolt is only moved in the axial direction. Follow and move forward. Furthermore, when the convex portion 32 is disengaged from the step 8 between the concave portions 6 and 7 due to this movement, frictional resistance is generated by the spring 40 at the contact portion between the head of the bolt 20 and the front surface of the washer 30. Therefore, the washer 30 rotates together with the bolt until its convex portion 32 contacts the surface 7a, as shown in FIG. 5a. At the end of rotation of the washer, as shown in FIG. 5b, the collar 31 of the washer and the notch 13a provided in the through hole of the flange 14 are aligned, and the cutter body can be removed. To attach the cutter, simply pass the collar of the washer through the hole 13 of the flange and then rotate the bolt 20 in the opposite direction. At this time, the convex portion 32 contacts the end surface 6a of the first recess to restrict the rotation of the washer. Thereafter, the washer is moved only in the axial direction and tightened in the state shown in FIGS. 4a and 4b.

It is sufficient to have at least two locking flanges 31 on the washer, but it is preferable to have three or more locking flanges as shown in the figure.The larger the number, the more uniformly the tightening force will be applied to the entire circumference of the cutter. and its holding state becomes stable.

Additionally, as shown in Figure 6, if the flange 14 of the cutter body is processed separately from the main body 10 and attached detachably, it becomes possible to combine the cutter with other holders, making effective use of one cutter. can. For example, if a flange 14 as shown in FIG. 7 is attached, the cutter body can be attached to the holder of the present invention or other quick-change type holder, while a ring 15 as shown in FIG. 8 can be attached in place of the flange. It becomes possible to attach it to a normal holder that is not a quick change type.

Further, the recesses 6 and 7 can be easily formed by cutting out a part of the protrusion as shown in the figure, but they may also be formed by digging into the front surface of the holder.

(e) Effects As described above, the cutting tool of the present invention allows the washer to rotate following the bolt, and the range of rotation is restricted by the holder, so that only the bolt can be rotated. Since the cutter body can be attached and detached from the holder, the cutter can be attached and detached more quickly and accurately.

In addition, since the holder is provided with two recesses that engage the convex parts of the washer, there is no need to machine complicated recesses on the tightening surface of each cutter, reducing the number of man-hours required compared to conventional quick change tools. It is possible to reduce waste from an economic perspective, and it is also advantageous from a maintenance perspective.
In particular, a holder in which the concave portion is formed by cutting out a protrusion is easier to process than one in which the concave portion is formed by digging, and the cost reduction effect is enhanced.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing an example of the quick-change type cutting tool of the present invention, Fig. 2 is a rear perspective view of the washer, Fig. 3 is a sectional view showing the assembled state of the tool, and Fig. 4 a is a front view showing the positional relationship between the convex part of the washer and the concave part of the holder when tightening the cutter body,
Figure b is a front view showing the positional relationship between the collar of the washer and the hole in the flange of the cutter body, and Figure 5a is
is a front view of the convex part of the washer moved to the second recess of the holder, b of the same figure is a front view showing the positional relationship between the collar of the washer and the hole of the flange, and Fig. 6 is the main body of the cutter. 7 is a perspective view of a flange attached to the cutter of FIG. 6, and FIG. 8 is a perspective view of a ring that replaces the flange. DESCRIPTION OF SYMBOLS 1... Holder, 4... Rotation key, 5... Protrusion, 6... First recessed part, 7... Second recessed part, 8...
Stepped portion, 10...Cut body, 11...Center hole, 1
2...Keyway, 13...Through hole, 14...Flange, 20...Tightening bolt, 30...Washer, 31
...Latching collar, 32...Protrusion, 40...Compression spring.

Claims (1)

[Scope of utility model registration request] A washer is attached to the center of the tip of the holder via a bolt, and a plurality of locking flanges are provided on the outer periphery of the washer at regular pitches in the circumferential direction, and the washer is attached to the holder via a rotation prevention means. A flange is provided in the center hole of the cutter body, which has a through hole that is similar in shape to the end view profile of the washer, and the locking collar of the washer passed through the hole of this flange is rotated relative to the flange, so that the front surface of the flange is In a cutting tool configured to be locked to a bolt, the front side of the holder has a first recess that receives a convex portion provided on the rear surface of the washer when the flange and the locking collar are in an engaged state, and a bolt. a second recess connected to the recess at the front in the loosening direction of the recess, the second recess having a shallower axial depth than the first recess;
and the terminal end thereof is positioned at a place where the convex part of the washer that is disengaged from the first recess rotates to a position where the flange and the locking collar can be inserted and removed, and further, the holder is located between the holder and the washer. A quick-change cutting tool featuring a compression spring.