JP2000107910A - Cutting insert - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the sharpness by providing a R-honing and an inclined plane having a prescribed width on the whole circumference of a cutting blade. SOLUTION: The mountain part 31 and valley part 32 of a corrugated cutting blade 3c have a C-plane 32b having a R-honing 31b on at least the lower end edge line of an upper end edge line 31c and the lower end edge line. Since the curvature radius R1 of the R-honing 31b is extremely small, the sharpness is satisfactory. Since the flow of cutting is decelerated (braked) by the C-plane 32b, chip treatment can be satisfactory performed. The C-plane 32b also provides the effect of high edge strength. The inclination α deg. of the C-plane 32b is preferably set within the range of 15 deg.-30 deg. and the curvature radius R1 of the R-honing 31b is preferably set to 0.06 mm or less. The horizontal width (w) of the C-plane 32b is preferably set within the range of 0.08 mm-0.3 mm. When the horizontal width of the C-plane 32b is less than 0.08 mm, there is a fear of a defect by the edge strength.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting insert which constitutes a cutting blade for cutting a metal or the like, and is particularly suitable for intermittent cutting often used for processing a rolled steel plate having a high ductility or a cold cast part. It relates to a cutting insert.

[0002]

2. Description of the Related Art Conventionally, a cutting insert having a large R honing of a cutting edge has been used as a cutting insert in order to prevent chipping occurring during cutting.

[0003] However, in intermittent cutting, which is often performed in the processing of rolled steel sheets or cold-cast parts having high ductility, if R honing is large, there is often a problem of defective products such as burrs.

In particular, as shown in FIG. 6 which shows an example of the form of processing of a rolled steel sheet, in the intermittent processing which occurs when working in the horizontal direction or the vertical direction, the use of a large R honing as described above results in poor sharpness. And other defects.

[0005] Further, when the R honing is reduced in order to improve the sharpness, there is a problem that chips are lost due to insufficient strength.

[0006] As described above, the work efficiency, the quality defect, and the decrease in the yield due to the occurrence of burrs (causes of product defects) and defects have been serious problems for users of cutting inserts for processing parts.

[0007]

SUMMARY OF THE INVENTION In view of the above problems of the prior art, the present invention provides not only good cutting performance but also good cutting performance in intermittent machining, which is often used for machining rolled steel sheets or cold-cast parts having high ductility. It is an object of the present invention to provide a high-performance cutting insert with stable curl and high edge strength.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a cutting insert having a cutting edge at one of the upper and lower ridges of a plate-like body. An inclined plane (hereinafter, referred to as a C plane) is provided.

Further, the inclination angle of the C plane is 15 ° to 30 °.
And the radius of curvature of the R honing may be 0.06 mm or less.

In the present invention, the above-mentioned inclined plane means one having an inclination angle of 10 ° or more and a horizontal width of 0.08 mm or more.

[0011]

The cutting insert according to the present invention having the above-described configuration is provided with an R honing and an inclined plane substantially all around the cutting edge. For example, intermittent cutting that occurs when machining the outer periphery or end face of a rolled steel plate In such as maintaining the conventional chip processing,
In addition, the cutting performance is greatly improved while maintaining the sharpness.

That is, in the above insert, the radius of curvature of the R honing is very small, so that the sharpness is good. In addition, since the flow of the chips is decelerated (braking) by the C surface, the chip processing is improved. In addition, the C surface also has the effect of increasing the edge strength.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

1 to 3 show the external shape of the cutting insert 10 of the present embodiment. The entire shape of the cutting insert 10 is a rhombus shape, and the cutting edge 3 is provided on the ridge of the rake face 1 and the flank 2. Is formed. In the nose portion 4, a breaker groove 6 is formed continuously with the cutting blade 3, and a breaker projection 8 is formed at a central portion of the breaker groove 6 and is connected to a seating surface 7.

As shown in FIG. 1, the nose portion 4 has a straight cutting edge 3b on both sides of a curved tip cutting edge 3a. The cutting edge behind the horizontal cutting edge 3b is a wavy cutting edge 3c curved in the vertical direction. The wavy cutting edge 3c has the highest and lowest rake faces connected to the peaks 31 and the valleys 32, respectively. Has plane cuts 31a and 32a.

4 and 5 are a sectional view taken along the line XX and a line YY of FIG. 1, respectively. As shown in these figures, the peaks 31 and the valleys 32 of the wavy cutting edge 3c are both at the top ridgeline 31.
At least the lower edge of c and the lower edge is provided with a C surface 32b formed by applying an R honing 31b. Although this cutting edge configuration is common to the entire circumference of the cutting edge, a part not involved in cutting at all may be another cutting edge configuration.

The cutting insert 10 constructed as described above
Is provided on almost the entire circumference of the cutting blade 3 with the R honing 31b and the C surface 32b.
For example, in intermittent cutting that occurs when processing the outer periphery or end face of a rolled steel sheet, the conventional chip processing is maintained, and while maintaining sharpness, the intermittent cutting performance is greatly improved. It is a thing.

That is, in the above cutting insert 10, R
The radius of curvature R1 (see FIG. 4) of the honing 31b is very small, and therefore, the sharpness is good. Moreover, C surface 3
Since the flow of chips is decelerated (braking) by 2b, chip processing is improved.

The C surface 32b also has the effect of increasing the edge strength.

The inclination angle α ° of the C surface 32b is 15
Is preferably in the range of 30 ° to 30 °, and the radius of curvature R1 of the R honing 31b is preferably 0.06 mm or less. The horizontal width w of the C surface 32b is 0.08 mm.
It is preferably in the range of 0.3 mm.

When the inclination angle α ° is less than 15 °, there is a possibility that the chip is easily broken. On the other hand, the inclination angle is 30 °
In all cases, or when the radius of curvature R1 exceeds 0.06 mm, the sharpness becomes dull and the cutting resistance tends to increase, and the direction in which the chips are discharged is not stable, and the chips may be easily extended. .

The horizontal width w of the C surface 32b is 0.0
If it is less than 8 mm, there is a risk of chipping due to the strength of the cutting edge, while if it exceeds 0.3 mm, the sharpness tends to be reduced.

As shown in FIG. 3, the horizontal cutting edge 3b moves the horizontal cutting edge 3b away from the tip of the nose in a downward angle β =
By forming it at 4 ° to 8 °, even in the case of cutting that is likely to cause cutting fluctuations such as R processing and copying, even chips that have a large cutting amount and flow easily can be reliably curled in a spiral shape at the horizontal cutting edge. . That is, wide chips that are likely to flow even in pulling or pushing work flow obliquely along the breaker protrusion 8 in a direction away from the work rather than trying to cross the breaker protrusion 8, and as a result, the chip Is smooth, is easily curled in a spiral shape, and is easily cut, and the cutting resistance is small. Therefore, in the cutting insert 10, the chip reliably hits the breaker projection 8 in both the pulling process and the pressing process, and the chip is curled and stably discharged. Even when the cutting amount changes, chips are satisfactorily processed.

If the rake angle of the transverse cutting edge 3b exceeds 15 °, burrs may be generated. Also, this horizontal cutting edge 3b
The rake angle of the nose is preferably larger than the nose angle of the nose. This is because when the nose angle is smaller than the rake angle at the tip of the nose, chips hardly flow in the direction away from the workpiece. If the downward angle β ° of the transverse cutting edge 3b is less than 4 ° or greater than 8 °, there is a possibility that the chip processing becomes worse.

In the cutting insert 10 having the wavy cutting edge 3c as described above, as a method of forming a substantially uniform C surface 32b and R honing 31b on the cutting edge of the entire circumference, a mold including a cutting edge portion is formed. Can be molded. By making the configuration of the cutting blade substantially uniform along the entire circumference, cutting performance and cutting edge strength can be stabilized.

The embodiment of the present invention has been specifically described above, but the present invention is not limited to this embodiment. For example, a cutting insert having no corrugated cutting edge may be used. . It goes without saying that any form can be adopted without departing from the purpose of the invention.

Embodiment In the cutting insert 10 shown in FIGS.
Angle of curvature of surface 32b and radius of curvature R1 of R honing 31b
As shown in Tables 1 to 3, respectively, and processing tests were performed under the following conditions.

[0028]

[Table 1]

[0029]

[Table 2]

[0030]

[Table 3]

Cutting conditions V = 350 m / min d = 0.5 mm f = 0.15 mm / rev Work material: clutch drum (SPHE) Tool shape: CNMG120404XP-T Holder shape: PCLNR2525M-12 Cutting fluid: Yes Tool material type : TN60 grade and PV9 manufactured by Kyocera Corporation
0 Grade Processing mode: Outer diameter processing In these processings, the magnitude of the cutting resistance, the presence or absence of a cutting edge, the chip treatment, the occurrence of burrs, etc. were visually evaluated. Tables 1 to 3 show these results.

As is clear from Table 1, the sample of the present invention, Sample No. Samples Nos. 2 to 4, 7 to 10, and 13 to 14 had good cutting resistance and were free from any edge loss. On the other hand, the sample No. 1 indicates that the width w of the C surface 32b is 0.08 m
m and chipping occurred at the cutting edge. The sample No. having the width w exceeding 0.3 mm was used. 5 was not sharp.

Sample N in which the inclination angle of the C surface 32b is less than 10 °
o. In No. 6, the cutting edge was broken. On the other hand, in the case of Sample No. in which the inclination angle exceeds 30 °, 11 was not sharp. The radius of curvature R1 of the R honing 31b is 0.0
No. exceeding 6 mm 15 was also poorly sharp.

[0034]

As described above, according to the present invention, the cutting edge is provided with the R honing and the inclined plane substantially all around.

Therefore, the radius of curvature of the R honing is very small, and the sharpness is good. And C
Since the flow of the chips is decelerated (braking) by the surface, the chip processing is improved. The C-plane also has the effect of increasing the edge strength.

[0036] Thereby, in the case of intermittent cutting or the like which occurs when processing the outer periphery or end face of a rolled steel plate, for example, the intermittent cutting performance can be greatly improved while maintaining the conventional chip processing and maintaining sharpness. Can be.

Further, in addition to the above configuration, by providing a wave-shaped cutting edge having a peak and a valley at one of the upper and lower ridges of the plate-like body, for example, when machining the outer periphery of the shaft, Chips can be curled in the case of pulling to a chip, and even in this case, since the cutting edge is provided with the C surface subjected to R honing, the sharpness can be improved and the curl of the chips can be stabilized.

[Brief description of the drawings]

FIG. 1 is a perspective view of a cutting insert according to an embodiment of the present invention.

FIG. 2 is a top view of the cutting insert of FIG.

FIG. 3 is a side view of the cutting insert of FIG. 1;

FIG. 4 is a sectional view taken along line XX of FIG. 1;

FIG. 5 is a sectional view taken along line YY of FIG. 1;

FIG. 6 is an explanatory view showing a cutting form of a clutch drum.

[Explanation of symbols]

 Reference Signs List 1 rake face 2 flank 3 cutting edge 3a tip cutting edge 3b horizontal cutting edge 3c wavy cutting edge 4 nose portion 6 breaker groove 7 seating surface 8 breaker projection 31 mountain portion 32 valley portion 31a, 32a plane cut 31b R honing 32b C surface (Sloped plane) R1 radius of curvature w horizontal width of C plane

Claims (3)

[Claims] 1. A cutting insert comprising a cutting edge provided on a ridgeline of a plate-like body, wherein the cutting edge has a horizontal width of 0.08 mm to 0.3 mm around substantially the entire circumference of the cutting edge, and a lower end ridgeline has an R. A cutting insert characterized by forming an inclined plane formed by honing. 2. The cutting insert according to claim 1, wherein an inclination angle of the inclined plane is in a range of 15 ° to 30 °, and a radius of curvature of the R honing is 0.06 mm or less. 3. The cutting insert according to claim 1, wherein the cutting edge is wavy having a peak and a valley.