JPH08330B2 - Milling tool - Google Patents

Description

TECHNICAL FIELD The present invention relates to a rolling tool such as a front slice capable of preventing chattering of a tool body.

“Prior Art” Conventionally, as this type of rolling tool, a non-uniformly divided type as shown in FIG. 8 is often used. And, in this non-uniform division type cutting tool, since the cutting edges 1a, 1b, 1c, 1d, 1e are arranged with unequal pitches in the rotational direction, the respective cutting edges 1a to 1e.
It is intended to prevent vibration resonance due to different feed cut depths (feed amount per blade) and deviation of impact time, and thereby to prevent chatter vibration of the tool body.

[Problems to be Solved by the Invention] However, in the conventional non-uniform division type rolling tool, the change in the feed amount per blade during cutting is slight, and the effect of preventing chattering vibration is obtained. There is a problem that there are few.

Moreover, because of the unequal division type, a large number of cutting edges cannot be taken. The size of the pocket 2 depends on the division angle α
_{Since the} smallest _one of α ₁ , α ₂ , α ₃ , α ₄ , α ₅ is regulated by α ₁ , it cannot be made large. Since the rigidity of the tool body changes depending on the cutting edge and the back metal (the back metal of the cutting edge 1e) 3 at the portion of the minimum division angle α ₁ is small, the rigidity becomes weak. Therefore, there is a problem that it cannot be used as a rolling tool for cast iron, which requires a large number of blades.

The present invention has been made in view of the above circumstances, and an object thereof is that it is possible to effectively prevent chattering, and is particularly suitable for the cutting of cast iron or the like that requires a large number of blades. To provide a simple rolling tool.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a plurality of identical plurality of substantially polygonal plate-shaped cutting edges on the outer peripheral side and the front side on the tip outer peripheral portion of the tool body. In the cutting tool in which the throw-away inserts are arranged at equal division angles, the cutting edges on the outer peripheral side of the adjacent throw-away inserts are arranged while gradually changing the radial distance from the rotation center of the tool body. , The amount of change in the radial distance between the adjacent outer cutting edges is set smaller than the maximum amount of change in the radial distance between the outer cutting edges (difference between the maximum radius and the minimum radius), It is characterized in that the cutting amount applied to the cutting edge on the outer peripheral side is changed to prevent chatter vibration.

Here, the amount of change in the radial direction between the adjacent cutting edges is set to 0.3 mm or less, and the maximum amount of change is set to 0.05 mm or more.

[Operation] In the rolling tool of the present invention, the adjacent cutting edges are arranged so as to gradually change in the radial direction of the tool body, whereby the feed amount per blade is changed to cause chatter vibration. Try to prevent.

[Examples] Examples of the present invention will be described below with reference to the drawings.

1 to 5 show an embodiment of the present invention, in which the reference numeral 10 is a tool body. Then, eight throw-away chips 11 each having a cutting edge 11a arranged at an equal division angle of 45 ° are attached to and detached from the tool body 10 by means of a wedge member 13 and a clamp screw 14 via a supporter 12, respectively. It is installed freely. These throw-away tips 11 have the same shape and the same size and, as shown in FIGS. 1 to 4, have a substantially polygonal plate shape (a substantially square plate shape in the figure). In the cutting blade 11a, a main cutting edge located on the outer peripheral side is formed on a ridge of a substantially polygonal shape, and a sub cutting edge located on the front side is linearly formed on a corner portion.

The positions P ₁ , P ₂ , P ₃ of the respective cutting edges 11a are set on an elliptical locus, as shown in FIG. Then, between the positions P ₁ and P ₂ or P ₂ and P _{3 of} the adjacent cutting edges 11a, they are displaced in the radial direction of the tool body 10 by change amounts F and G, respectively,
The maximum change amount H is F + G. Also, the change amount F, G
Are set to 0.3 mm or less. Where 0.3mm
If it is set to a larger value, the feed amount per blade becomes too large, which causes a problem such as chipping of the cutting edge 11a. Further, it is desirable that the maximum change amount H is 0.05 mm or more. That is, when it is less than 0.05 mm, the change in the feed amount per blade is slight, and the effect of preventing chattering cannot be expected so much.

In the rolling tool configured as described above, the throwaway tip 11 mounted on the outer periphery of the tip portion of the tool body 10 is used.
Since the cutting blades 11a are arranged so as to gradually change in the radial direction of the tool body 10, the tool body 10 may resonate due to the different feed amount per blade given to each cutting blade 11a. There is no chattering vibration.

Further, the one shown in FIG. 6 is the position of each cutting edge P ₄ , P ₅ , P ₆ , P
It is obtained by changing ₇ , P ₈ and P ₉ into a sinusoidal curve. That is, for example, if the maximum change amount a is 0.4 mm, the change amount from the position P ₄ is y, the number of blades is 10, and the angle from the position P ₄ is x, the position P _{4 of} each cutting edge, Y in P ₅ , P ₆ , P ₇ , P ₈ , P ₉
Are respectively expressed by y = a sin x / 2 (mm), Can be changed like.

Further, as shown in FIG. 7, the position of each cutting edge P ₁₀ , P ₁₁ ,
P ₁₂ , P ₁₃ , P ₁₄ , and P ₁₅ are increased or decreased at equal intervals. That is, when the maximum change amount is c and the change amount of the adjacent blades is b, the change is performed by c = b × (number of blades) / 2.

Thus, in each of the above embodiments, the adjacent cutting edges
Since 11a are arranged so as to be gradually changed in the radial direction of the tool body 10, the feed amount per blade can be sufficiently changed, and chatter vibration can be effectively prevented. Moreover, since each cutting edge 11a is arranged at the outer peripheral portion of the tip of the tool body 10 at an equal division angle, it is possible to increase the number of blades as compared with the conventional unequal division type cutting tool, and The back metal rigidity of the main body can be improved, and the size of the pocket can be made sufficiently large. Therefore,
It can also be used as a cutter for cast iron, effectively preventing chattering. In each of the above examples, each cutting edge 11a was arranged at an equal division angle, but the present invention is not limited to this, and when the number of blades is small, even if the cutting edge is arranged at an unequal division angle, there is a problem. If this does not occur, all or part of each cutting edge 11a may be arranged at unequal division angles.

"Effects of the Invention" As described above, according to the present invention, for each cutting edge of a plurality of throw-away tips arranged at equal division angles, the outer peripheral blades adjacent to each other, the distance in the radial direction of the tool body, By arranging the blades in a gradually changing manner and changing the depth of cut applied to the outer peripheral cutting blade, the feed amount per blade can be changed, and chatter vibration can be effectively prevented. In addition, the amount of change can be arbitrarily set according to the cutting conditions, the material to be cut, and the like, and it is possible to flexibly deal with various materials to be cut. In particular, it is possible to prevent chattering vibrations in a cast iron cutter that requires a large number of blades, which is difficult to implement in the past.

[Brief description of drawings]

1 to 5 show a first embodiment of the present invention. FIG. 1 is a front view, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. III-III line view of the figure, FIG. 4 is a IV-IV line view of FIG. 3, FIG. 5 is a cutting blade arrangement view, and FIG. 6 is a cutting edge arrangement of the second embodiment of the present invention. FIGS. 7 and 8 are cutting blade arrangement diagrams of the third embodiment of the present invention, and FIG. 8 is an explanatory diagram of a conventional unequal division type milling machine. 10 …… Tool body, 11a …… Cut blade, F, G, z, b …… Change amount, H,
a, c …… Maximum variation.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takanobu Saito 1-27-20 Nishi-Shinagawa, Shinagawa-ku, Tokyo Mitsubishi Metals Co., Ltd. Tokyo Works (56) Reference JP-A-49-68988 (JP, A) Public Sho 53-41831 (JP, B2)

Claims (3)

[Claims] 1. A rolling tool in which a plurality of substantially polygonal plate-shaped identical throw-away tips each having cutting edges on the outer peripheral side and the front side are arranged at equal division angles on the outer peripheral portion of the tip of the tool body. The cutting edges on the outer peripheral side of the throw-away tip are arranged while gradually changing the radial distance from the center of rotation of the tool body, and the change in the radial distance between the adjacent outer cutting edges. The amount is set to be smaller than the maximum change amount of the radial distance between the outer cutting edges, and the cutting depth applied to the outer cutting edges is changed to prevent chatter vibration. A cutting tool to do. 2. The rolling tool according to claim 1, wherein the amount of change in the radial direction between the adjacent cutting edges is 0.3 mm or less. 3. The rolling tool according to claim 1 or 2, wherein the maximum change amount is 0.05 mm or more.