JPH0613768Y2 - Throwaway tip - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a throw-away tip mainly used as a bite, and in particular, a technology for controlling the chip discharge direction to avoid interference with a work material or the like. It is about.

[Prior Art] Conventionally, as throwaway chips (hereinafter, simply referred to as chips) used as a cutting tool, those shown in FIGS. 7 and 8 are known. The chips shown in these figures have a substantially triangular plate shape whose upper and lower surfaces are parallel to each other,
A cutting edge 2 is formed on the ridge portion of the upper surface to be the rake face 1, and a predetermined range of wall portions from the corner portion 3 where the cutting edges 2 and 2 intersect to the adjacent corner portion 3 in the counterclockwise direction. A chip breaker groove 4 extending in a direction inclined outward with respect to the cutting edge 2 is formed, and the chip breaker 4 moves from a corner 3 to an adjacent corner 3. The width is gradually narrowed, and the cross-sectional shape orthogonal to the extending direction is a concave curved surface 4a having a substantially arc shape.

Such a chip is used as a cutting edge of a cutting tool, and is pressed against the concave curved surface 4a of the chip breaker groove 4 to curl in a spiral shape, thereby cutting the chip into short pieces.

[Problems to be solved by the invention] However, in the case of the above-mentioned chip, when cutting is carried out by transversely feeding the cutting tool, as shown in Fig. 9, the curled chips 5 are on the work material side. Not only makes it difficult to process because it stretches toward the work piece and becomes entangled with the work material, but it is also dangerous for the operator. Moreover, the cutting surface is damaged by chips, and the accuracy of the processing surface deteriorates. was there.

That is, in the cutting process, the chips 5 usually extend along the chip breaker groove 4 in the direction orthogonal to the cutting edge 2 (direction of arrow A in the figure). However, in the above chip, since the chip breaker groove 4 is inclined in the direction opposite to the feeding direction (the arrow C direction in the drawing), the chips 5 are in the direction in which the chip breaker groove 4 is inclined (the arrow in the drawing). B direction)
It is bent so that it twists, and as a result curls toward the work material side.

The present invention has been made in order to solve such a problem, and it is possible to reliably regulate the outflow direction of the chips in the direction away from the work material, and thus greatly improve the accuracy of the machined surface. It is, of course, an object of the present invention to provide a throwaway tip that facilitates chip disposal and enables smooth cutting work.

[Means for Solving Problems] The throwaway tip of the present invention has a polygonal plate shape in appearance, and at least one of the upper and lower surfaces is a rake face, and the ridge line portion of the rake face is cut. A blade is formed, and a chip breaker groove whose width gradually narrows from the corner toward the adjacent corner is formed on the wall in a predetermined range from the corner of the rake face toward the adjacent corner. In this chip breaker groove, there is a downward slope from the cutting edge to the end in the direction in which the chip breaker groove extends so that the distance between the upper and lower surfaces gradually decreases from the corner toward the adjacent corner. It is composed of an inclined surface in which the distance between the upper and lower surfaces gradually decreases toward the side, and side surfaces rising from the central side edge of the inclined surface in a direction substantially orthogonal to the upper and lower surfaces.

[Operation] The chips generated by the cutting edge extend in a direction substantially orthogonal to the cutting edge along the inclined surface of the chip breaker groove, and are bent by being restrained by the inclined surface and the side surface. Here, on the corner side, since the distance from the cutting edge to the side surface is long and the height of the side surface is low, the chips can escape to the upper space, and therefore are bent with a relatively large radius of curvature. On the other hand, on the adjacent corners, the distance from the cutting edge to the side surface is short and the height of the side surface is high, so that the chips are reliably restrained by the inclined surface and the side surface, and thus bent with a small radius of curvature. As a result, the chips curl in a substantially frusto-conical shape, and the part with the smaller radius of curvature is rotated so that the part with the larger radius of curvature is swung to the adjacent adjacent corner part side. It extends in the feeding direction so as to be separated from the corner portion side, that is, the work material.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 6. FIG. 1 is a plan view showing a throwaway tip (hereinafter, simply referred to as a tip) 10 according to an embodiment. The chip 10 is a positive chip having a substantially triangular plate shape whose upper and lower surfaces are parallel to each other, and is integrally formed of cemented carbide or the like. The upper surface of the tip 10 is a rake face 11, and the cutting edge 1 is provided on the ridge of the rake face 11.
2 is formed. In addition, a rounded corner is formed at a corner portion 13 where the cutting edges 12 intersect with each other. Then, in the wall portion in a predetermined range extending from the corner portion 13 toward the adjacent corner portion 13 in the counterclockwise direction, the corner portion extending outward in the direction adjacent to the cutting edge 12 and adjacent to the corner portion 13 The width of the chip breaker groove 14 is gradually reduced toward the side of the portion 13
Are formed. The above points are the same as those of the conventional one.

However, the chip breaker groove 14 extends in the extending direction of the chip breaker groove 14 so that the distance between the upper and lower surfaces gradually decreases from the corner 13 toward the adjacent corner 13 in the counterclockwise direction. Inclined surface 15 that has a downward slope and also a downward slope from the cutting edge 12 to the center side
And a side surface 16 rising from the central side edge of the inclined surface 15 in a direction substantially orthogonal to the upper surface.

Here, the height of the ridge of the corner 13 is set to be lower than the height of the rake face 11 by a dimension T (T is 0 to 0.05 mm). Further, the intersection of the inclined surface 15 and the side surface 16 is formed as a concave curved surface having a radius of curvature R (R is 1.0 mm or less). Reference numeral 17 in the drawing is a mounting hole.

As shown in FIG. 4, such a tip 10 is detachably mounted on a bite holder 18 by a mounting bolt 19 and used as a cutting edge thereof. Then, the bite holder 18 is attached to the work material 20 that is rotated,
When fed in the direction of arrow C in the figure, the chips 21 generated by the cutting edge 12 extend in a direction substantially orthogonal to the cutting edge 16 along the inclined surface 15 of the chip breaker groove 14, and the inclined surface 15 and the side surface 16 are formed. It is bent by being restrained by. Here, on the side of the corner 13a located on the side of the work material 20, the distance from the cutting edge 12 to the side surface 16 is long and the height of the side surface 16 is low, so that the chips 21 can escape to the upper space. Therefore, the chips 21 are bent with a relatively large radius of curvature. On the other hand, on the side of the adjacent corner 13b, since the distance from the cutting edge 12 to the side surface 16 is short and the height of the side surface 16 is high, the chips 21 are separated from the inclined surface 15 and the side surface 1.
It is securely restrained by 6 and is therefore bent with a small radius of curvature.

As a result, as shown in FIG. 6, the chips 21 are curled into a substantially truncated cone shape, and a portion with a large radius of curvature on the corner 13 side is the opposite side with the portion with a small radius of curvature as the center. It rotates so as to be swung toward the part side (the direction of arrow D in the drawing), and extends toward the feeding direction of the bite boulder 18 so as to be separated from the adjacent corner part 13b side, that is, the work material 20. Then, the extended chips 21 are cut when the length thereof becomes longer to some extent, and cut into short pieces.

In such a chip 10, the chips 21 are used as the work material 2
Since it extends in the feed direction so as to be separated from 0,
The chips 21 do not collide with the machined surface to cause scratches on the machined surface. Therefore, the surface accuracy of the machined surface can be significantly improved. Further, since the chips 21 do not entangle with the work material 20, the chips 21 can be easily processed, and the cutting work can be performed smoothly and safely.

In addition, although the present invention is applied to the positive chip in the above-mentioned embodiment, the same effect as the above can be obtained by applying the present invention to the negative chip. Further, the shape is not limited to the triangular shape, and other shapes such as a square shape and a diamond shape may be applied. Further, in the above embodiment, the chip breaker groove 14 is used.
Is formed on the wall portion in a predetermined range extending from the corner portion 13 toward the adjacent corner portion in the counterclockwise direction. However, it is opposite to this, that is, it is formed in the clockwise direction from the corner portion 13. Is also good.

[Effect of the Invention] As described above, the throwaway tip of the present invention has a polygonal plate-like appearance, and at least one of the upper and lower surfaces is a rake face, and the ridge line portion of this rake face is formed. A cutting edge is formed, and a chip breaker groove whose width is gradually narrowed from the corner toward the adjacent corner is formed on a wall in a predetermined range from the corner of the rake face toward the adjacent corner. , The tip breaker groove has a downward slope to the end in the extending direction of the chip breaker groove so that the distance between the upper and lower surfaces gradually decreases from the corner toward the adjacent corner, Since it is composed of an inclined surface in which the distance between the upper and lower surfaces gradually decreases as it goes toward, and a side surface rising from the central side edge of the inclined surface in a direction substantially orthogonal to the upper and lower surfaces, Since the chips extend in the feeding direction so as to be separated from the work material, there is no possibility that the chips collide with the cut working surface and cause scratches on the working surface. Therefore, the surface accuracy of the machined surface can be significantly improved. Further, since the chips are not entangled with the work material, the chips can be easily processed, and the cutting work can be smoothly and safely performed. Moreover,
Even if the chip is wide enough to cover the entire chip breaker groove, one side of the chip is not bent at the end of the chip breaker groove to the work material direction and the ejection direction cannot be changed. Is discharged in the direction away from the work material.

[Brief description of drawings]

1 to 6 show an embodiment of the present invention.
FIG. 1 is a plan view showing a throwaway tip, FIG. 2 is a view taken in the direction of arrow II in FIG. 1, FIG. 3 is a view taken in the direction of arrow III in FIG. 1, and FIG. A plan view showing a state of being mounted on a holder and performing cutting processing,
FIG. 5 is a perspective view showing a state where the chips are bent by the chip breaker groove, FIG. 6 is a perspective view showing a state in which the chips are further grown from the state shown in FIG. 5, and FIGS.
The figure shows an example of a conventional throwaway tip,
FIG. 7 is a plan view thereof, FIG. 8 is a view taken in the direction of arrow VIII in FIG. 7, and FIG. 9 is a perspective view showing a state where chips are bent in the chip breaker groove. 1 ... rake face, 2 ... cutting edge, 3 ... corner part, 4 ... chip breaker groove, 10 ... throwaway tip, 11 ... rake face, 12 ... cutting edge, 13 ... corner part, 14 ... Chip breaker groove, 15 ... Inclined surface, 16 ... Side surface.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Bibliographic references Sho 58-126103 (JP, U) JP 57-28603 (JP, B2) JP 61-1725 (JP, B2)

Claims (1)

[Scope of utility model registration request] 1. An appearance polygonal plate, wherein at least one of upper and lower surfaces is a rake surface, and a cutting edge is formed at a ridge line portion of the rake surface, and the cutting edge is adjacent from a corner portion of the rake surface. In a throwaway chip in which a chip breaker groove having a width that gradually narrows toward the adjacent corner side from the corner is formed in a wall portion in a predetermined range toward the corner side, the chip breaker groove is formed into the corner. As the distance between the upper and lower surfaces gradually decreases from the edge to the adjacent corner side, there is a downward slope to the end of the direction in which the chip breaker groove extends, and the distance between the upper and lower surfaces gradually increases from the cutting edge toward the center. A throw-away tip comprising a decreasing inclined surface and a side surface rising from a central side edge of the inclined surface in a direction substantially orthogonal to the upper and lower surfaces.