JPS6135362Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention uses scooping surfaces on both the upper and lower sides, has cutting blades on each of the upper and lower sides of the polygon and the corners of each side, and has breaker grooves parallel to each of the sides on the scooping surfaces on both sides. A regular polygonal throw-away tip is placed on the shim fixed on the counterbore surface formed at the tip of the shank, with one scooping surface facing up, and the cutting edge can be turned upside down or changed to allow for attachment and detachment. This is a clamp-on type throw-away cutting tool to be mounted, in which the throw-away tip is stably seated on the deposit.

As shown in Fig. 1, a shim c having approximately the same planar shape as the throwaway chip e is fixed to a counterbore surface b formed at the tip of a shank a with a countersunk screw d, and a polygonal breaker is attached to the top surface of the shim. In a clamp-on type throw-away cutting tool in which a grooved throw-away tip e is seated at a certain angle and fixed by tightening with a presser foot h and a bolt i, a breaker is installed between the top surface of the pad c and the bottom surface of the tip e. Since a space j corresponding to the width of the groove f is created and the contact area is reduced, the stability of the chip e is reduced. In addition, when a regular polygonal throw-away tip is turned upside down and mounted on a pad c, a gap s is created between the worn cutting edge g and the pad c, as shown in Fig. 2, and the tip of the chip Since it is in a cantilevered state, the throw-away tip causes chatter vibration due to cutting resistance, which makes the cutting edge more likely to break and reduces the surface roughness of the workpiece.

The present invention aims to eliminate such drawbacks, and one embodiment thereof will be described with reference to FIGS. 3 to 7.

In the figure, reference numeral 1 denotes a shank, and a security deposit 3 placed on a countersunk surface 2 formed at its tip is tightened and fixed with a countersunk screw 6 passed through a countersunk hole 5. As the deposit 3, use one that has substantially the same planar shape as the throw-away chip 7 described later. A throw-away chip 7 is received on the pad 3, and the chip 7 is pressed and fixed by a presser foot 12 which is tightened by a bolt 11. An example of the throw-away tip 7 is a polygonal one formed into an equilateral triangle, with scooping surfaces 8, 8 on the upper and lower surfaces, and the scooping surfaces 8, 8 have respective sides and corners of each side of the upper and lower polygons. is ground to form a cutting edge 9, and a breaker groove 10 with a concave arc cross section is formed along the inside of each side.
is formed.

In this embodiment, a projection 4 having a convex arcuate cross section is specially provided on the upper surface of the shim 3 in the above-mentioned known structure to align and fit into contact with the breaker groove 10 of the chip.

In addition to the regular triangular shape described above, the throwaway tip 7 may be formed into a regular polygon such as a regular quadrangle. If it is square, change the angle by 90 degrees and attach it to the security deposit 3.
In the case of an equilateral triangle, change the angle by 120° and deposit 3
It is designed to be worn on top and then flipped upside down. For this reason, the protrusions 4 of the pad 3 are provided at positions where they fit into the respective breaker grooves 10 at any mounting angle of the chip 7.

When the throw-away tip 7 is an equilateral triangle, the scooping surfaces 8 on both sides, as shown in FIG.
8 is provided with breaker grooves 10 that are intermittent and independent from each other along part of each of the cutting edges 9 on three sides, or
As shown in the figure, breaker grooves 10 are provided along the entire circumference of the cutting edge 9 on three sides. As shown in Fig. 6, the deposit 3 specially provided with intermittent protrusions 4 in an equilateral triangular arrangement has a throw-away tip 7 shown in Fig. 4.
The security deposit 3 specially provided with protrusions 4 in a continuous equilateral triangular arrangement as shown in Fig. 7 is shown in Fig. 5.
Applies to throwaway tip 7.

The present invention has the structure and operation as clarified through the explanation of the embodiments described above, and allows the throw-away tip 7 to be stably seated on the upper surface of the deposit 3 at any angle, and the cutting edge 9 is prevented from vibration due to chatter. It is possible to prevent chipping and deterioration of the surface roughness of the workpiece, and also to facilitate the alignment of the throw-away tip 7 and the deposit 3 by fitting the breaker groove 10 and the protrusion 4,
It also has the effect of preventing the throw-away tip 7 from sliding due to cutting resistance.

[Brief explanation of the drawing]

Figures 1 and 2 are vertical sectional side views of the main parts of a conventional throw-away cutting tool, Figures 3 to 7 show an embodiment of the present invention, Figure 3 is a vertical sectional side view of the main parts, and Figure 4 is A plan view showing an example of a throw-away tip,
5 is a sectional view taken along the line A-A, and FIG. 5 is a plan view showing another example of the throw-away tip 7.
6 is a plan view showing an example of the deposit 3, and the same is a sectional view taken along the line C-C.
FIG. 7 is a plan view showing another example of the security deposit 3, and FIG. 7 is a sectional view taken along the line DD. 1→Shank, 2→Spot face, 3→Deposit, 4→
Protrusion, 7 → Throwaway tip, 8 → Scooping surface,
9 → Cutting blade, 10 → Breaker groove.

Claims (1)

[Claims for Utility Model Registration] The upper and lower surfaces are scooping surfaces 8, 8, and cutting edges 9, 9 are formed on the upper and lower surfaces of each side and corner of each side of the polygon, and the scooping surfaces 8, 8 are provided with cutting edges 9, 9. A regular polygonal throw-away tip 7 with breaker grooves 10 parallel to each side of the square is placed on one scooping surface 8 on a deposit 3 fixed on a counterbore surface 2 formed at the tip of a shank 1. In the throw-away cutting tool, which has the upper surface and the cutting blade 9 is turned upside down or the angle is changed and is detachably attached, A protrusion 4 into which each breaker groove 10 of the throw-away tip 7 to be installed matches and fits.
A throw-away cutting tool characterized by being provided with.