JPH0253502A - Throwaway type cutter and throwaway tip - Google Patents

Abstract

PURPOSE:To eliminate the variance in the width of a minor cutting edge due to wear, improve the quality of a finished surface, broaden the width of a cutting edge end, and increase the strength of the cutting edge by tilting the inner flank edge more than the minor edge by a specified angle and by disposing the inner flank edge along the axis and on the base end side of a cutter body. CONSTITUTION:A tip 11 is provided with three sets of a straight line-shaped outer circumferential major cutting edge 13, an arc-shaped corner edge 14 and a straight line- or a large arc-shaped minor cutting edge 15, and a straight line-shaped inner flank edge 16. The angle alpha formed with the minor cutting edge 15 and the inner flank edge 16 is defined as 15-25 deg. for example, while the width y of the minor cutting edge 15 is defined as 1-2.5mm and therefore the width y does not increase even if the edge wears and the width of the cutting edge end can be made wide. At least one of the tips is made to be a tip 17 provided with three sets of a straight line-shaped outer major cutting edge 18, an arc-shaped corner edge 19, and a straight line- or a large arc-shaped flat drag 20. The tip 17 is made to project farther than the minor cutting edge 15 on the fore-end side by a specified length A and the width w is made greater than the width y so that the quality of a finished surface is improved by the flat drag 20.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a slow 7-way cutter such as a shoulder milling cutter that has a substantially triangular tip on the cutter body and has a high cutting edge strength, This invention relates to an indexable tip used in a type cutter.

[Conventional technology]

Conventionally, shoulder milling cutters with approximately triangular tips of this kind provided on the cutter body have a plurality of triangular edges on the outer periphery of the tip of the approximately cylindrical cutter body 1, as shown in FIGS. 11 to 14. Throw-away tips 2 of the same shape are removably attached to a wedge member 4 and a clamp screw 5 via a supporter 3, respectively.

[Problem to be solved by the invention]

By the way, as shown in FIG. 12, the pentagonal indexable insert 2 used in the conventional shoulder milling cutter has an outer main cutting edge 6, a corner edge 7 connected to the outer main cutting edge 6, and a corner edge 7 connected to the outer main cutting edge 6. Equipped with three sets of auxiliary cutting edges 8 connected to the corner edge 7,
Since there are three cutting edge corners that can be used, it is more economical than a parallelogram-shaped or rhombus-shaped sl-away insert, but on the other hand, it has the following problems.

1, that is, the chip IQ angle is 60° as shown in Figure 12.
Therefore, the strength in the vicinity of the auxiliary cutting edge 8 is insufficient, and it is easy to cause large chips, and the insert for shaving to lengthen the finished surface has a different shape from the indexable insert 2 (for example, a parallelogram shape). Because of this, they cannot be installed at the same location and each supporter must be replaced, and therefore, there has been no case where it has been put to practical use.

The present invention has been made in view of the above circumstances, and its purpose is to increase the strength of the cutting edge, make the chip less likely to break, and make it possible to make the chip for drying easier to distinguish from the chip for general use. It is an object of the present invention to provide an indexable cutter and an indexable tip that can be easily installed and provide a good finished surface (cutting surface).

[Means to solve the problem]

In order to achieve the above object, the first indexable cutter of the present invention has a substantially triangular tip provided on the cutter body, which extends from the outer peripheral main cutting edge toward the inside of the cutter body to form a corner edge and a secondary cutter. A cutting edge and an inner relief edge are sequentially provided, and the inner relief edge is inclined at a predetermined angle than the auxiliary cutting edge and is disposed on the base end side along the axis of the cutter body.

In addition, the second indexable cutter of the present invention is provided with a second tip in addition to the above-mentioned tip (first tip) on the cutter body, and this second tip extends from the outer peripheral main cutting edge to the cutter body. A corner blade and a flattened blade are sequentially provided toward the inside of the cutter body, and the flattened blade projects further toward the tip of the cutter body than the sub-cutting edge of the first tip and extends inward of the cutter body. It is provided with a long extension towards the front.

Further, the indexable insert of the present invention has a substantially triangular root-shaped chip body, and has a main cutting edge, a corner edge connected to the main cutting edge, a minor cutting edge connected to the corner edge, and a minor cutting edge. Provided with an inner relief blade connected to the inner relief blade, and this inner relief blade,
It is provided at an obtuse angle with respect to the auxiliary cutting edge.

[For production]

In the indexable cutter and indexable tip of the present invention, the inner relief edge of the tip (first tip) is tilted at a predetermined angle relative to the first cutting edge, and is placed on the proximal end side along the axis of the cutter body. By arranging the auxiliary cutting edge, even if the auxiliary cutting edge wears, the width of the auxiliary cutting edge, which has a large effect on the finished surface, does not change, and a good finished surface can be obtained, and the tip of the cutting edge can be formed wide. This increases the strength of the cutting edge.

〔Example〕

Hereinafter, embodiments of the present invention will be used based on FIGS. 1 to 9.

1 to 8 show an embodiment of the present invention,
Reference numeral 10 in the figure is a substantially cylindrical cutter body, and a plurality of indexable tips (first tips) 11 are attached to the outer periphery of the distal end of the cutter body 10, as in the conventional case.

As shown in FIGS. 2 to 5, the first tip 11 has a substantially pentagonal and plate-like tip body 12 whose top surface ridgeline is a cutting edge.

The cutting edges include a linear outer main cutting edge 13, an arc-shaped corner edge 14 (for example, radius R=1 m) connected to the outer main cutting edge 13, and a straight or large arc-shaped corner edge 14 connected to the corner edge 14. It is provided with three sets of a sub-cutting edge 15 (for example, radius 500) and a linear inner relief edge 16 connected to the sub-cutting edge 15.

The angle β between the inner relief edge 16 and the outer peripheral main cutting edge 13 is set to 896 to 65 degrees, preferably 87'' to 80 degrees, and therefore, the n1 cutting edge 15 and the inner relief edge 16
and the angle α is between 1° and 25°, preferably 3
It is set between 10° and 10°. Here, the above angle α is 1
The reason why the angle α is set to between 1° and 25° is that if the angle α is smaller than 1°, the width y of the auxiliary cutting edge 15 will become wider due to wear of the auxiliary cutting edge 15, which will worsen the finished surface. This is because the tip of the cutting blade becomes sharp and the strength of the cutting blade cannot be improved.

In the shoulder milling cutter equipped with the first tip 11 configured as described above, the angle α formed by the auxiliary cutting edge 15 and the inner relief edge 16 is 1° to 25°. Therefore, the width y (approximately 1 to 2.5 m) of the auxiliary cutting edge 15 can be regulated to a predetermined width, and even if the auxiliary cutting edge 15 wears, the width y does not widen, so that a good finished surface can be obtained. In addition, the inner escape blade 16
By providing this, the tip of the cutting blade can be made wider, and therefore the strong electric current of the cutting blade during cutting can be improved. Na J3
, by providing the inner relief blade 16, the maximum depth of cut f
Although dT is smaller than the maximum depth of cut 11 of the conventional tip 2 shown in FIG. 10, a sufficient depth of cut for actual use can be secured, and cutting will not be hindered.

Alternatively, at least one of the many first tips 11 attached to the cutter body 10 may be replaced with a throw-away tip (second tip) 17 shown in FIG. 2 and FIGS. 6 to 8. good.

The second chip 17 has approximately the same shape as the first chip 11 and is slightly larger, and includes a linear outer main cutting edge 18 and an arc-shaped (for example, radius 1 #I) corner blade 19 and a straight line or large arc shape (for example, radius 500M) connected to this cope blade 19
It is equipped with three sets of side blades (auxiliary cutting blades) 20.

As shown in FIG.
, 03 to 0,1), and the width W of the Sarai blade 20 is the same as the width Y of the n1 cutting edge 15 (1 to 1).
2.5#III) or longer (for example, 5 minutes or more).

In the shoulder milling cutter in which the second tip 17 configured as described in 1- is attached to the cutter body 10 together with the first tip 11, the flat blade of the second tip 17 is attached together with the first tip 11. By cutting with the first chip 11, a better finished surface is formed, and the first chip 11
Since the shape of the second chip 17 is round, it can be easily replaced and can be flexibly adapted to suit the application.

In the above embodiment, the inner relief blade 16 of the first tip 11 extends straight from the cutting edge 15 of the cutting edge 11 to the cutter body 10.
Although the description has been made using a shape that escapes toward the proximal end side, the shape is not limited to this, and for example, as shown in FIGS. .1~0
．． 3#III) may be used.

That is, the inner relief edge 21 is at an angle γ from the auxiliary cutting edge 15.
(106 to 45 degrees) and escapes inward by a distance z (slanted portion -21a), and then extends parallel to the minor cutting edge 15 to the outer peripheral main cutting edge 13 (parallel portion 21b). In this case, as shown in FIG. 10, the parallel part 21 of the inner relief blade 21
If the angle between the first rake face and the flank face at b is expressed as a1 and the angle between the rake face and the flank face at the sub-cutting edge 15 is expressed as b, then a≧b is set.

〔Effect of the invention〕

As explained above, in the present invention, a substantially triangular tip provided on a cutter body sequentially cuts a corner edge, a minor cutting edge, and an inward escape from the outer main cutting edge toward the inside of the cutter body. Since the inner relief blade is inclined at a predetermined angle than the auxiliary cutting edge and arranged on the proximal side along the axis of the cutter body, the inner relief blade is disposed at a predetermined angle inward following the 11th cutting edge. By providing an inner relief edge that escapes from the edge, the width of the auxiliary cutting edge does not change even if the auxiliary cutting edge wears, which greatly affects the finished surface, and it is possible to obtain a good finished surface. The tip of the cutting blade can be formed wide, and therefore the strength of the cutting blade can be increased.

In addition, the cutter body is provided with a second tip in addition to the first tip, and the second tip is provided with a corner edge and a side edge in order from the outer peripheral main cutting edge toward the inside of the cutter body. This is because the flattening blade is provided so as to protrude further toward the tip side of the cutter body than the sub-cutting edge of the first tip and to extend longer inward of the cutter body. By cutting with the flat blade of the second chip together with the first chip, it is possible to obtain a good finished surface, and the shape of the first and second chips can be made into a groove. It can be easily replaced and flexibly adapted depending on the situation.

Furthermore, the indexable insert of the present invention has a substantially triangular and temporary chip body, and has a main cutting edge, a corner edge connected to this main cutting edge, a minor cutting edge connected to this corner edge, and this minor cutting edge. Provided with an inner relief blade connected to the inner relief blade, and this inner relief blade,
Since it is inclined at an obtuse angle from the above-mentioned minor cutting edge,
The width of the auxiliary cutting edge does not change regardless of the wear of the D1 cutting edge, and it has the excellent effect that a predetermined finished surface can be obtained and the cutting edge is less likely to break.

[Brief explanation of the drawing]

1 to 8 show an embodiment of the present invention,
Figure 1 is a sectional view, Figure 2 is an explanatory diagram showing the first chip and the second chip, Figures 3 to 5 are examples of the first chip, and Figure 3 is a plan view. Figure 4 is a cross-sectional view,
Fig. 5 is a plan view of the tip of the cutting blade, Figs. 6 to 8 show an example of the second tip, Fig. 6 is a plan view, and Fig. 7
The figure is a sectional view, FIG. 8 is a plan view of the tip of the cutting blade, FIGS. 9 and 10 show other examples of the first tip, FIG. 9 is an explanatory view, and FIG. 9 x-X arrow view, No. 11
1 to 14 show a conventional indexable cutter, in which FIG. 11 is a sectional view, FIG. 12 is an explanatory view of the tip, FIG. 13 is a front view, and FIG. 14 is a side view. 10... Cutter body, 11... Indexable tip (first tip), 13... Outer main cutting edge, 14... Corner blade, 15 ...minor cutting edge, 16...inner relief blade, 17...throwaway tip (second tip), 18...outer main cutting edge, 19...Corner blade, 20...No. Lie blade (Misaki 1 cutting edge), 21...
・Inner escape blade, α, T・・・・Angle. Figure 5 Figure 6 Figure 7 Figure 8

Claims (3)

[Claims] (1) In an indexable cutter with a substantially triangular tip provided on the cutter body, the tip moves from the outer main cutting edge toward the inside of the cutter body, forming a corner edge, a minor cutting edge, and an inner relief edge. A throw-away type cutter, characterized in that the inner relief blade is arranged at a predetermined angle inclination than the auxiliary cutting blade and is arranged on the proximal side along the axis of the cutter body. (2) In a throw-away cutter in which a substantially triangular tip is provided on the cutter body, the first tip provided on the cutter body is connected to a corner edge and a sub-edge from the outer main cutting edge toward the inside of the cutter body. A cutting blade and an inner relief blade are sequentially provided, and the inner relief blade is arranged on the base end side along the axis of the cutter body at a predetermined angle inclination than the auxiliary cutting edge, and The provided second tip is directed inward from the outer peripheral main cutting edge of the cutter body, and is provided with a corner edge and a flattened edge in this order, and this flattened tip is provided with a corner edge and a flattened edge inward from the outer circumferential main cutting edge of the first tip. A throw-away type cutter, characterized in that the cutter is provided so as to protrude from the distal end side of the cutter body and to extend long toward the inside of the cutter body. (3) In a throw-away chip whose chip body is approximately triangular and plate-shaped, the chip body has a main cutting edge, a corner cutting edge connected to the main cutting edge, a sub-cutting edge continuous to the corner cutting edge, and a sub-cutting edge connected to the corner cutting edge. 1. A throw-away chip characterized by being provided with an inner relief edge connected to the cutting edge, and the inner relief edge being inclined at an obtuse angle with respect to the auxiliary cutting edge.