SE450348B - IS ACTION - Google Patents

Description

10 lS 450 348 2 a large range of cutting parameters.

The insert of the present invention has a cutting edge “land” area and one behind and below the cutting edge located, intermediate '1fifl å ”' 0mrå fi G- A b0 fi te fl | which slopes downwards towards the center of the insert, is located behind and below the intermediate "land" area.

The insert is preferably reversible and made of a hard and durable material, such as cemented carbide. Before- The insert is coated with a refractory oxide nitride. and / or carbide material coating.

The sloping bottom is preferably also symmetrical. risk around a plan, which contains the bisectric for insert: corner angle. In this way, it can be sloping bottom at the high feed rates, above which it the inner edge of the intermediate "land" area may be ineffective tiv as a chip breaker, forming a conical chip and thereby reduce energy consumption.

An object of the present invention is therefore that provide a durable cutting insert, which is designed to regulate chips and reduce energy consumption over a large range of cutting parameters.

The invention will now be described in more detail with reference to to the accompanying drawings.

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

Fig. 2 is a sectional view along the line II-II in Fig. 1 and shows a cross section along the bisector of the corner angle.

Fig. 3 is a sectional view taken along the line III-III in Fig. 1 and shows a cross section between the corners.

Fig. 1 shows a reversible insert 1 according to the present invention. The insert has a polygonal frame with a circumferential wall 3 and an upper surface 5, whereby a cutting edge 7 is formed at the connection between the circumferential wall and the upper surface.

The cutting edge 7 is connected to a cutting edge "land" area 9, which extends inwardly from the cutting edge. At area 9 inner edge extends a wall ll inward and downward to one other "land" area 13. Area 13 also extends inwards and joins with a second wall 15. The wall 15 is wide y ' 450 343 3 its inner edge joined by a sloping bottom 17. The bottom 17 is symmetrical about the bisectrices of the corner angles. One bisector is shown in Fig. 1 as a line B-B.

As shown in Fig. 1, the sloping bottom 17 be connected to a flat bottom 19, which preferably is parallel to a plane formed by the cutting edges 9. at The center of the insert is formed an insert hole 21, which can be designed to accommodate a locking pin or screw.

It can be seen from Fig. 2 that the wall 11 forms an angle with the plane defined by the cutting edges 7. This angle A a: faretrxaeevis 2o-12 °. cradle 11 unites maa 'maa-- area 13 at an angle B of IS5-170 °.

From Fig. 2 it further appears that the sloping bottom 17 forms an angle with a plane, which is parallel to the cutting edge plane. This angle D should be 1-10 °, and off Fig. 2 further shows that the sloping bottom 17 is is closest to the "land" area l3 in the corner area.

This distance is indicated by X in Fig. 2.

From Fig. 3 it can be seen that the sloping bottom 17, then it extends away from the corner areas, slopes downwards parallel to the sides of the insert until it joins the flat bottom 19. The slope of the sloping bottom 17 height difference H from the corner area to the flat bottom 19 should be between 0.13 mm and 0.38 mm.

The construction of the sloping bottom 17 helps in conjunction with that of the 'land' area 13 and the wall 15 formed the angle C to form a conical chip at very high feed rates and thereby minimize åe fl e fl eïâi consumption required for metalworking at the high feed rates, at which the chips slides down the wall 15 and comes into contact with it sloping bottom 17. the angle C should suitably be between 140 ° and 160 ° for to give optimal results. The distance X is preferably 0.38-.D76 mm.

Claims (9)

450 348 10 15 20 25 30 PATENT REQUIREMENTS Cutting insert with a hard, durable body, which, seen from above, has the shape of a polygon and which has at least one corner, a circumferential wall (3) and an upper surface (5), a cutting edge (7) being formed at the connection between the circumferential wall and the upper surface and wherein the upper surface (5) has a first "land" area (9). extending inwardly from the cutting edge (7), a first wall (ll) extending downwardly inwardly from the first "land" area, a second "land" area (13) located within the first wall, and a second wall (15) extending downwardly inwardly from the second "land" area, characterized by a bottom (17) sloping downwardly inwardly from said corner and the depth below which the second "land" area (13) is least in the area of said corner, where this depth is 0.38-0.76 mm, and increases as the second wall (15) extends away from said corner. Cutting insert according to claim 1, characterized by a flat bottom (19), which extends inwards from the sloping bottom (17) and defines one in relation to this oblique plane. Cutting insert according to Claim 1, characterized in that the sloping bottom (ll) is inclined relative to a plane defined by the first "land" area (9). Cutting insert according to claim 1, characterized in that the upper surface (S) has the shape of a polygon, the cutting edge (7) and the circumferential wall (3) defining the sides and corners of the polygon. S. A cutting insert according to claim 4, characterized in that the height of the first "land" area (9) above the outermost end of the sloping bottom (17) is at least in the corner of the polygon. Cutting insert according to claim 1, characterized in that the first "land" area (9) is substantially flat and that the first wall (II) slopes downwards from the first "land" - the area (9) at an angle of 12-20 °. Cutting insert according to claim 6, characterized in that the second "land" area (13) is substantially flat and substantially parallel to the first "land" area (9) and that the first wall (II) and the second "land" island area (13) forms an inner angle of 155-170 °. 8. A cutting insert according to claim 1, 6 or 7, characterized in that the sloping bottom (17) has a vertical height difference of 0.13-0.38 mm between its highest and lowest point. characterized by the fact that the sloping bottom (17) is symmetrical about a plane. which contains the bisectric Cutting insert according to Claim 1, (B-B) for the angle formed by the nearest corner.