JPS5841048Y2 - Throwaway tip - Google Patents

Description

[Detailed description of the invention] The invention relates to a throw-away chip.
In particular, the present invention relates to an indexable insert that can perform stable and excellent chip disposal even under cutting conditions with large fluctuations in depth of cut and feed.

A conventional indexable tip is shown in FIGS. 1 and 2.

FIG. 1 is a plan view, and FIG. 2 is an enlarged cross-sectional view taken along line AA in FIG. 1.

A conventional indexable insert has a breaker groove formed along the cutting edge on its upper surface or upper and lower surfaces, and the curl diameter of chips is adjusted by the groove width α and curvature radius γ.

It is generally known that it is desirable that the breaker groove width α be wide under heavy cutting conditions with large depth of cut and high feed, and narrow under light cutting conditions with small depth of cut and low feed.

However, since the breaker groove width α and radius of curvature γ formed on one chip are usually constant, under heavy cutting conditions with a large depth of cut and many feeds, the curling diameter of chips is small as shown in Figure 3. Otherwise, the chips will not be discharged smoothly.

Furthermore, under light cutting conditions with a small depth of cut and low feed, as shown in Figure 4, there is a problem in which the chips do not curl sufficiently and are ejected in a straight line, which hinders the cutting operation.
The present invention eliminates the drawbacks of the conventional indexable inserts mentioned above, and effectively performs chip disposal over a wide range of cutting conditions with large fluctuations in depth of cut and feed, such as copy cutting in turning machining. The purpose of the present invention is to provide an indexable tip with a breaker groove that can be formed.

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

5 and 6 are a plan view and a side view of an indexable tip according to an embodiment of the present invention, and FIGS. 7, 8, and 9 are a BB cross section in FIG. 5, respectively, and FIG. C-C cross section, D
- It is an enlarged view of the D cross section.

In these figures, 1 is a triangular plate-shaped indexable tip, and the top surface, which is one side used for cutting, has a
It has a breaker groove 3 continuously adjacent to the cutting edge 2 over the entire circumference, and the shape of the breaker groove is from the cutting edge toward the ridge 4 in the remaining area where the breaker groove 3 is formed, and is the deepest force groove. The height h from the bottom surface 7 in an arbitrary cross section perpendicular to the outer circumferential surface 6 of the ridge 4 changes from the height H of the cutting edge 2 near the center of the cutting edge 9. The inner frame 5 of the ridge 4 protrudes toward the nose tip 9 in the vicinity of the nose. .

Further, the ridge portion 4 has at least one depression 10.

The shape of the depression is preferably such that it reaches the deepest part of the breaker groove in a direction perpendicular to the bottom cylinder of the indexable tip, as shown in FIGS. 5 and 7.

Note that the height change of the ridge portion 4 from the vicinity of the nose portion to the vicinity of the central portion of the cutting edge may be a continuous or discontinuous linear change or a curved change.

In addition, when both the upper and lower parts are used for cutting, the central land part 8 may be made higher than the maximum height of the ridge part 4, or the support surface may be formed as a flat part of the same height.

In other words, when only a single piece is used for cutting, the central land section 8 may be a flat section that is higher or lower than the maximum height of the ridge section 4, as shown in Fig. 6; When used, the central land portion 8 needs to be a plane portion that is equal to or higher than the maximum height of the ridge portion 4.

FIG. 9 shows the state of chip evacuation using the indexable insert of the present invention under heavy cutting conditions with a large depth of cut and high feed, and FIG. 10 shows the state of chip evacuation under light cutting conditions with a small depth of cut and small feed.

Furthermore, FIG. 11 shows the state of chip discharge under micro-cutting conditions where the depth of cut is small and the feed rate is small.

With the indexable insert according to the present invention, under heavy cutting conditions with large depth of cut and high feed, by providing a depression located at the deepest part of the breaker groove in the ridge 4 as shown in Fig. 7, the width of the breaker groove is widened and the chips are curled. Since the ridge 4, which serves as a restraining surface for the cutting, is divided, the chips do not come into contact with the ridge 4 discontinuously, and the restraining force is relaxed, and it is also possible to give directionality to the chips. As shown in the figure, the chips can be curled and discharged easily.

In addition, under light cutting conditions where the depth of cut is small and the feed is low, the ridge 4 is located higher than the cutting edge 2 as shown in Fig. 8, and the ridge 4 has the same effect as narrowing the breaker groove width.
As shown in the figure, the chips can be sufficiently curled and discharged.

An enlarged plan view of the nose portion in FIG. 5 is shown in FIG. 13, and E-El! in FIG. 11 is shown. ? A direct diagram is shown in FIG.

Under minute cutting conditions with a small depth of cut, the inner frame 5 of the ridge 4 of the nose protrudes toward the nose tip 9, so the first
Since the breaker groove width is formed narrower than in Fig. 1, even thin chips as shown in Fig. 12 can be sufficiently curled and discharged.

In the above embodiments, the shape of the inner frame from which the nose part protrudes is an arc, but as shown in FIG. 15, it may be a part of an ellipse, or it may have any other shape. .

In addition, as for the ridge part 4, the height of the land @ 4 from the vicinity of the nose part to the vicinity of the central part of the cutting edge is changed, and at the same time
The inner frame may be curved near the center of the cutting edge, or may be parallel.

It is also possible to increase the number of cutting edges by making both the top and bottom of the indexable insert the same shape.
In addition, it is not limited to triangular plate-shaped throw-away tips, but also polygonal plate-shaped tips such as square and diamond shapes.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a conventional indexable insert, Fig. 2 is an enlarged cross-sectional view of A-A in Fig. 1, and Fig. 3 is a state of chip evacuation when the conventional indexable insert has a large depth of cut and a large number of feeds. FIG. 4 is a diagram similarly showing a case where the depth of cut is small and the feed is small. FIGS. 5 and 6 are a plan view and a side view of the indexable insert according to the present invention, and FIGS. The figures are enlarged views of the B-B cross section, C-c cross-section, and D-D cross section of Fig. 5, respectively, and Fig. 10 shows the state of chip evacuation using the indexable insert of the present invention under heavy cutting conditions with a large depth of cut and many feeds. Figure 11 is a diagram showing the chip evacuation state under light cutting conditions with a small depth of cut and low feed, and Figure 12 is a diagram showing the chip evacuation state under micro cutting conditions with an even smaller depth of cut and less feed. Figure 13 is an enlarged plan view of the nose part in Figure 5, Figure 14 is E in Figure 13.
-E sectional view and FIG. 15 are enlarged plan views of the nose portion of a modified example. 1 Nithrowaway tip, 2: Cutting edge, 3: Breaker groove, 4: Ridge, 5: Inner frame, 6: Outer surface, 1: Bottom, 8
: Flat straight part, 9: Nose tip, 10: Hollow, H: Height from the bottom surface to the cutting edge 2 grooves, h: Height from the bottom surface to the ridge part 41.

Claims (1)

[Scope of utility model registration request] The indexable insert 1, which is a polygonal plate, has a breaker groove 3 continuously adjacent to the cutting edge @ 2 over the entire circumference on at least one surface constituting the polygon, and the shape of the breaker groove 3 is similar to that of the cutting edge. From 2 to the ridge 4 in the remaining area as the breaker groove 3 is formed, the breaker groove changes from concave to convex near the deepest part, and 1 the land @ 4 is the outer circumferential surface 6.
The height h from the bottom surface 7 in an arbitrary cross-section perpendicular to The ridge 5 protrudes toward the nose tip 9 near the nose portion and has at least one depression 10 in the ridge portion 4, and is higher than or equal to the maximum height of the land @4. A throw-away tip characterized in that it has a central portion 8 forming a plane portion with a height of .