JPS6231208Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a throw-away tip, which has been improved so that it can ensure a particularly wide range of effective chip disposal and is also suitable for profiling.

Conventionally, this type of throw-away chip has been disclosed, for example, in Japanese Patent Publication No. 1983-4270 and Japanese Utility Model Publication No. 49-49.
45170, Utility Model Application Publication No. 56-28808, etc. are disclosed.

The tip breaker disclosed by the former is a so-called dot-shaped chip breaker in which a protrusion for light cutting is formed in the breaker groove at the nose portion of the entire periphery of the breaker groove. However, although this chip breaker groove expands the effective range of chip disposal to some extent compared to the all-circumference breaker type, it is not sufficient in view of the recent trend towards high feed rates.

Furthermore, the last one disclosed utilizes a so-called waveform curved surface. However, although this chip breaker is effective for high feeds, it cannot exhibit an effective chip disposal effect in the area of light cutting.

The present invention was developed in view of the above points, and aims to expand the effective range of chip disposal and apply it to copying machining by rationally combining the conventionally known dot-shaped and wave-shaped chip breaker grooves. This provides a throw-away tip with a

An embodiment of the throw-away chip of the present invention will be described below with reference to the drawings.

In FIGS. 1 to 4, reference numeral 1 denotes a square plate-shaped throw-away chip, and a boss surface 2 and a central mounting hole 3 are provided in the center portion of the square surface. Further, a cutting edge 4 and a chip breaker groove 5 are formed in the peripheral portion exhibiting a square surface. In the vicinity of the nose portion of the chip breaker groove 5, a protrusion 6 having two consecutively arranged protrusions is provided so as to be separated from the boss surface 2, to effectively dispose of chips during light cutting. This is because if the protrusion 6 is connected to the boss surface 2, the sitting stability will be better, but the curl radius of chips will be smaller. This is because, after the chips come into contact with each other, the curl radius follows the curvature of the protrusion 6 and becomes larger.

In the side direction along the cutting edge 4, the chip breaker groove 5 has a wavy curved surface having semi-circular irregularities that match the curved edge of the cutting edge 4. In this case, the cutting edge 4
is formed as a wavy curved edge consisting of semi-circular arc-shaped unevenness starting from the nose portion as a base point.

Further, the boss surface 2 protrudes beyond the cutting edge 4 in the thickness direction of the chip, and in the side direction along the cutting edge 4, is based on a waveform curved surface that matches the waveform curved surface of the chip breaker groove 5. It is formed so that the adjacent ones intersect each other on the bisector of the nose part. In the illustrated case, the boss surface 2 has a concave surface 2a and a flat surface 2b with the peaks removed, which are continuous when viewed from the circumferential side.

Further, the boundary portion 7 between the boss surface 2 and the chip breaker groove 5 similarly has a waveform curve. In the transverse direction from the cutting edge 4 to the boss surface 2, the chip breaker groove 5 has a first
As shown in the figure, the sloped surface 5a and the bottom surface 5b are formed so that the width is narrow at the mountain portions and wide at the valley portions, respectively.

The protrusion 6 has a configuration in which two ridges having a symmetrical roundness are arranged in series with a concavity in the direction of the bisector of the nose portion. It is a familiar thing. The height of the protrusion 6 is lower than the boss surface 2.
This is done in consideration of the effectiveness of chip disposal in light cutting.

Also, what is shown in FIGS. 5 and 6 is
The shape of the protrusion 6 has changed from a so-called heart shape to a figure eight shape. In addition, in this example,
Although the illustration shows one without a narrow land, it can be added as appropriate depending on the cutting conditions. This is because the strength of the cutting edge 4 is increased by adding it.

The throw-away tip of the present invention constructed in this way has the following effects.

First, the chip disposal range has been expanded. This is achieved by employing the protrusion 6, the boss surface 2 having a waveform curved surface, and the chip breaker groove 5. That is, as shown in FIG. 7, the protrusion 6 facilitates chip disposal during light cutting, and the wave-shaped curved surface of the chip breaker groove 5 makes chip disposal effective during medium-heavy cutting and profiling processing. In this case, for medium-heavy cutting, feed f = 0.3 to 0.6
mm, and the depth of cut d is intended to be in the range of about 2 to 6 mm.

The basic shape of the product A of the present invention is shown in Figures 1 to 4.
The one shown in the figure is an approximately square plate-shaped throw-away chip with an inscribed circle of 12.7 mmφ and a nose radius of 0.8 mm. Conventional product B for comparison is
It has the same shape with a 2.0mm wide breaker all around, and has a dot-shaped protrusion inside the breaker near the nose.

Second, cutting resistance can be reduced. This is because the incline is created by the cutting edge 4 that begins with a downward slope at the nose, and the mechanism of the chip breaker groove 5 also reduces the cutting resistance.

That is, as shown in FIG. 8, when comparing the cutting resistance, the product A of the present invention is reduced by about 50 kg·f compared to the conventional product B described above. In addition, for cutting at this time, the work material is SUS304.
Cutting speed V = 120m/min, depth of cut d = 2.0
mm, and feed f=0.2 mm/rev.

Third, tool life is increased. This means that the boss surface 2 and the waveform curved surface of the chip breaker groove 5 have the same pitch, and the chip breaker groove 5
This is because the bottom surface 5b that restrains the chips against the inclined surface 5a in the transverse direction of the tip is formed to weaken the rise toward the boss surface 2, so that the chips are not forcibly broken and the load on the throw-away tip 1 is reduced. .
In other words, the life diagram (V
This is because _B - T) was obtained. In addition, for cutting at this time, the work material is SCM415, and the cutting speed is V=
150m/min, depth of cut d=1.5mm, feed f=0.3mm/
rev.

Fourthly, the protrusion 6 increases the curl radius of the chips, making it easier to dispose of the chips. This is because after the chips come into contact, the curl radius follows the curvature of the protrusion 6 and becomes larger.

As explained above, this invention is a rational combination of dot-shaped protrusions and wave-shaped cutting edges, so it ensures a wide range of effective chip disposal, reduces cutting resistance, and extends tool life. It has the effect of elongating the area, and is also suitable for copying.

[Brief explanation of the drawing]

Fig. 1 is a front view showing one embodiment of the throw-away tip of the present invention, Fig. 2 is a partial side view, and Fig. 3 is a partial side view.
The figure is an enlarged sectional view taken along the - line in Fig. 1, Fig. 4 is a partially enlarged sectional view taken along the - line in Fig. 1, and Fig. 5 shows a modified example. The front view shown in Fig. 6 is a partial side view, and Fig. 7 is a partial side view.
The figure is an explanatory diagram showing an example of the effective processing range of chips for the product of the present invention and the conventional product, Fig. 8 is an explanatory diagram comparing the cutting resistance, and Fig. 9 is an explanatory diagram comparing the cutting life. It is. 3... Boss surface, 4... Cutting edge ridge, 5... Chip breaker groove, 5a... Inclined surface, 5b... Bottom surface, 6...
...Protrusion, 7...Boundary part.

Claims (1)

[Claims for Utility Model Registration] A cutting edge 4 and a chip breaker groove 5 are formed around the entire circumference of the peripheral edge portion, which has a polygonal plate shape and exhibits a polygonal surface. In the indexable tip, a boss surface 2 is formed in the tip portion, and a protrusion 6 separate from the boss surface 2 is present in the tip breaker groove 5 at the nose portion of the cutting edge 4. , the cutting edge 4 is formed by a semicircular arc-shaped wavy curved edge that begins to slope downward from the nose portion, and the chip breaker groove 5 is formed by a side along which the cutting edge 4 runs. In the direction, the surface portion is formed by a wave-shaped curved surface that matches the curved edge of the cutting edge 4, and in the transverse direction from the cutting edge 4 to the boss surface 2, the width is narrow at the peak portion and the width is narrow at the valley portion. An inclined surface 5a and a bottom surface 5b are formed so that the width becomes wider at the tip.
It is more convex than that, and in the side direction along the cutting edge 4,
It is formed so as to leave at least a concave surface 2a of the waveform curved surface that matches the waveform curved surface of the chip breaker groove 5, and the adjacent parts intersect each other on the bisector of the nose part, and the waveform is formed at the boundary part 7 with the chip breaker groove 5. The protrusion 6 has two symmetrical rounded peaks with a concavity in the direction of the bisector of the nose portion. 2. A throw-away chip characterized by having a structure in which two are connected in series, and the height thereof is lower than the boss surface 2.