JPS6024497Y2 - Throw-away tip with corrugated cutting edge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to an indexable insert having a wavy cutting edge, particularly a negative type indexable insert having a wavy cutting edge on two opposing sides of a rectangular insert.

Conventionally, broaching is often used to process the inner width of mass-produced parts.

Broaching is efficient, but requires high capital investment and
There are also difficulties in terms of installation space and the like.

Therefore, in recent years, lifeing cutters and short broaches have been used so that the rough machining process can be performed with a rifling cutter using a corrugated tip (chip with a wavy cutting edge), and the finishing process can be performed with a short broach. There is a tendency to use small integrated machines.

This invention is suitable for the tips of roughing cutters used in such complex machines.

By the way, as shown in FIG. 1, this type of conventional tip 1 is formed in a rectangular shape, and corrugated cutting edges 2 are provided on opposing long sides thereof, the phases of which are shifted from each other.

FIG. 2 shows a state in which the inner width of a workpiece 4 is being processed by a roughing cutter 3 using this tip 1.

In this case, as is clear from the drawings, the bottom edge 5 of the tip 1 hits the workpiece 4 (so-called solid contact), which undesirably increases the cutting resistance.

Therefore, in order to avoid such a solid contact, as shown in FIG. 3, there is a means for attaching the chip 1 so as to be inclined inward by an appropriate angle θ.

However, in this case, there is a drawback that the finishing allowance 7 increases and the broached portion increases accordingly.

This invention solves the problems of the prior art as mentioned above,
The purpose is to provide a corrugated tip with low cutting resistance.

Hereinafter, an embodiment of this invention will be described based on FIGS. 4 and 5.

As shown in FIG. 4, the chip 10 of this invention has two pairs of opposing sides forming a rectangle, including the long side.
A wave-shaped cutting edge 11 whose phase is shifted by 172 pitches is provided, and a concave bottom edge 12 is provided on the other opposing side.

The bottom blade 12 is formed flat near the corner portion 13, but gradually becomes intermediate.

Note that in the figure, symbols 1 and 2 are phase identification symbols.

FIG. 5 shows a state in which the inner width of a workpiece 15 is being processed by the roughing cutter 14 using the above-mentioned corrugated tip 10.

In this case, as is clear from the drawing, since the bottom blade 12 has a concave shape, even if the depth of cut in the radial direction increases, the bottom blade 12 does not make solid contact, thereby reducing the increase in cutting resistance. It can be avoided.

Therefore, the original purpose of use of the corrugated chip, which is to reduce cutting power and obtain a good vibration damping effect, is not impaired.

Note that if the depth of cut is greater than the length of the bottom blade (d/
1≧1), chip 1 is the same as explained in FIG.
0 can be mounted inclined inward, but the angle of inclination in this case may be smaller than in the conventional case.

As described above, even if the cutting depth becomes large, the cutting resistance of the corrugated tip of this invention does not increase significantly, so that the purpose of using the corrugated tip can be achieved.

[Brief explanation of the drawing]

Figure 1 is a front view of a conventional waveform chip, Figures 2 and 3 are cross-sectional views of the waveform chip in use, Figure 4 is a front view of the waveform chip of this invention, and Figure 5 is a cross-section view of the waveform chip in use. . 10...Chip, 11...Corrugated cutting edge,
12... Bottom blade.

Claims (1)

[Scope of utility model registration request] In an indexable insert in which a wave-shaped cutting edge is provided on one pair of opposing sides forming a square, the other pair of opposing sides that are not provided with a wave-shaped cutting edge are formed in a concave shape. Throw-away insert with a characteristic wave-shaped cutting edge.