KR910002319Y1 - Throw away tip - Google Patents

Abstract

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Description

Drawaway tip

1 to 6 show one embodiment of the drawaway tip of the present invention, and FIG. 1 is a front view.

FIG. 2 is a view taken along line II-III of FIG. 1;

3 is a view seen from line III-III of FIG.

4 is a cross-sectional view taken along the line IV-IV of FIG.

5 is a front view showing the state attached to the planar cutting type cutter body.

6 is a front view showing a state of being attached to a right angle shoulder cutting type cutter body;

7 to 10 show another embodiment of the present invention, Figure 7 is a front view.

8 is a front view showing a state of being attached to a planar cutting type cutter body.

9 is a front view showing a state of being attached to a right shoulder shoulder cutting type cutter body.

10 is a front view showing the state attached to the bite.

11 to 13 show one example of a conventional drawaway tip, and FIG. 11 is a side view.

12 is a front view.

13 is a sectional view taken along line P ₁ -P _{1 of} FIG. 12;

14 is a side view showing another example of a conventional drawway tip.

15 to 19 show another example of a conventional drawaway tip, and FIG. 15 is a side view.

16 is a front view.

17 is a cross-sectional view taken along line P ₂ -P _{2 of} FIG.

18 is a front view showing a state of being attached to a cutter body.

FIG. 19 is a view from the line P ₃ -P _{3 of} FIG. 18;

* Explanation of symbols for main parts of the drawings

29, 42: drawaway tip 30, 34, 43, 47: the upper surface

31, 32, 44, 45: sub cutting edge 33, 46: main cutting edge

35, 48: Cutting edge end 36, 49: Cutting edge end

37, 50: convex surface 38, 51: concave surface

39: top

60, 61, 62, 63: corner nose blades

The present invention relates to a drawaway tip used as a cutting tool such as a front milling cutter or a cutter.

In recent years, among the above-described drawway tips, various positive drawaway tips have been developed in which a rake surface is formed in a convex curved shape along a main cutting edge.

11 to 13 show an example of this type of drawaway tip in the related art, and each of the respective corner portions of the upper surface 2 of the drawaway tip 1 forming a substantially square plate shape as a whole. ), The sub cutting edge 3 is formed, and the main cutting edge 4 is formed in the edge part between these sub cutting edges 3.

The side of the drawaway tip 1 is inclined toward the center of the drawaway tip 1 from the above-described main cutting blade 4 and the sub-cutting blade 3, respectively, to reach the lower surface 5. A blade flank 6 and a blade 7 are formed.

The pair of opposing main cutting edges 4 and 4 of the above-described main cutting edges 4 are formed such that the inclined surfaces 8 and 8 form a circular arc-shaped convex curve on the cutting edge ridges. It is formed by the main surface convex curved surface.

Here, the inclined surface 8 is located at a position where the top 9 is biased by the length A toward the cutting edge 10 at the intermediate position 12 between the cutting edge 10 and the cutting edge 11. It is formed in contact with the upper surface (2).

In addition, the code | symbol 13 is a granular part continued from the inclined surface 8 to the upper surface 2 in the figure.

However, in the drawaway tip 1 in which such an inclined surface 8 is formed by a convex curved surface, the angle of the cutting edge tip edge is large, the edge strength of the blade is excellent, and the cutting resistance or heat by cutting It is known to have advantages such as reduced generation.

However, in the above conventional drawaway tip 1, the inclined surface 8 of the convex curved shape is formed so that its top portion 9 is the intermediate position 12 of the cutting edge rear end 10 and 11 of the main cutting edge 4. Since it is formed at a position biased toward the cutting edge tip 10, the position of the cutting edge rear end 11 relative to the upper surface 2 is lower than the cutting edge tip 10.

Accordingly, the edge portion adjacent to the rear end edge 11 of the main cutting edge 4 has a convex curved surface where the portion to form the same cutting edge leading edge 10 as the main cutting edge 4 is already formed. Since it is cut off at the time of forming, it is impossible to form the same convex curved surface as the above-mentioned main cutting edge 4 at the above edge portion, and thus the above-described main cutting edge 4 and 4 only at two opposite edge portions. There is a drawback in that it is inferior in economic efficiency since it cannot be used as the main cutting edge 4 which has the convex curved surface which raised the whole side part.

Therefore, as shown in FIG. 14, the cutting edge tip for forming the granular wall 16 toward the upper surface 15 from the cutting edge rear end 14 and forming the adjacent main cutting edge 17 into a convex curved shape. A drawaway tip for securing the cutting margin of (18) is also proposed.

However, in this drawaway tip, since the deep pocket 20 is formed by the inclined surface 10 at the rear end side of the main cutting edge 17 and the above-mentioned granular wall 16, the chip removal is extremely bad. .

For this reason, the drawaway tip 21 as shown to FIG. 15-FIG. 17 is also proposed as improvement of the said fault.

The drawaway tip 21 has the inclined surface 23 on the main cutting edge 22, and the top 24 has the above-mentioned cutting edge at the center position 27 of the cutting edge tip 25 and the cutting edge rear end 26. It is formed as a convex curved surface on the circumferential surface so as to contact the upper surface 28 in the position biased by the length A toward the rear end 26.

That is, in this drawaway tip 21, the position of the cutting edge rear end 26 with respect to the upper surface 28 becomes a position higher than the position of the cutting edge front end 25. As shown in FIG.

As a result, at the rear end of the main cutting blade 22 described above, the cutting margin for forming the inclined surface 2330 of the adjacent main cutting blade 22 in the same convex curved surface can be secured.

Therefore, in this drawaway tip 21, the inclined surface 23 of the main cutting edge 22 of all the edge parts can be formed in convex curved surface.

However, in the conventional drawaway tip 21, the inclined surface 23 that forms the circumferential convex curved surface is the position where the top portion 24 is biased toward the cutting edge rear end 26 from the center position 27 described above. Since it forms so that it may become, the angle (alpha) which the cutting-edge tip 25 and the surface 28 make will become large eventually.

Therefore, as shown in FIGS. 18 and 19, when the drawaway tip 21 is attached to the cutter body 29, the plane O parallel to the axis of the cutter body 29 is cut. In order to prevent the angle β formed by the tangent line at the tip 25 from becoming at least an incidence angle, the inclination angle I must be taken larger than those shown in FIGS. 11 to 14.

For this reason, as shown in FIG. 18 and FIG. 19, in order to obtain predetermined clearance angle (theta), a large clearance angle must be formed in advance in the drawaway tip 21 itself, Therefore, this drawaway is necessarily inevitable. The area of the lower surface of the tip 21 is reduced, and not only the seating rigidity and the processing precision are lowered, but also the thickness of the cutting edge tip 25 is reduced so that the blade strength is lowered.

Therefore, in view of the above circumstances of the present invention, the inclined surfaces of all the major cutting edges formed on each side portion can be formed as convex curved surface, so that the economic efficiency is high, the cutting performance is excellent, and the chip processing is also good. It is for the purpose of providing drawaway tips.

Therefore, the drawaway tip of the present invention forms a polygon with parallel upper and lower surfaces, and a sub-cutting blade is formed at each corner of the upper surface, and one end is provided at a side portion between these sub-cutting blades. The upper cutting surface according to the main cutting edge of the drawaway tip formed by forming a main cutting edge that is formed parallel to the cutting edge, extends from one end of the main cutting edge to the other end, and the top cutting The convex curved surface at one end biased from the center between both ends of the blade and the sub cutting edge in contact with the other end side of the main cutting blade described above and located at the other end side of the main cutting blade described above. It is formed into a concave curved surface extending to one upper surface, and the shape is formed into a rhombic or parallelogram shape, and the main cutting edge and the sub cutting edge A nose nose edge was formed between them.

Hereinafter, the present invention will be described in detail with reference to the drawings.

1 to 6 show an example of the drawaway tip of the present invention.

In FIGS. 1 to 4, the drawaway tip 29 has a rhombic plate-like appearance, and sub-cutting blades 31 and 31 are formed at each obtuse portion of the upper surface 30. Sub-cutting edges 32 and 32 are formed at each acute angle.

And the main cutting edge 33 is formed in the edge part between these sub cutting edges 31 and 32, respectively.

In addition, between the above-mentioned sub cutting edge 31 and the main cutting edge 33 of each part forming an obtuse angle, the core cutting blade 60 also has the above-described sub cutting edge 32 and the main part of the acute angle. Coowner nose blades 61 are formed between the cutting edges 33.

And the upper surface 34 of the edge part different from each main cutting edge 33 of this drawaway tip 29 extends from the cutting edge front end 35 of the said main cutting edge 33 to the cutting edge rear end 36, respectively. The cutting edge rear end at the position of the circumferential surface-shaped convex curved surface 37 of the radius R which extends and forms the inclined surface of this main cutting edge 33, and the cutting edge rear end 36 of this convex curved surface 37 It is formed by the concave curved surface 38 extending to the side of the sub cutting edge 31 and 32 of the (36) side.

The convex curved surface 37 has the top portion 39 biased by the length A toward the cutting edge tip 35 at the intermediate position 40 between the cutting edge tip 35 and the cutting edge rear end 36. It is formed in contact with the upper surface 30 at the position.

The concave curved surface 38 is in contact with the convex curved surface 37 at the position of the cutting edge rear end 36, and here the same height as that of the upper surface 30 near the irregular cutting edges 31 and 32 described above. The cross section which can extend to a position is formed in the concave curved surface of the arc of radius r.

In the figure, reference numeral 41 denotes a granular surface which smoothly extends from the convex curved surface 37 and the concave curved surface 38 toward the upper surface 30.

The drawaway tip 29 having the above-described configuration has a planar cutting type by attaching the nose holder nose 60 as a cutting edge to the cutter body 55, as shown in FIG. As the front milling cutter, as shown in FIG. 6, the co-own nose blade 61 of each acute angle portion is attached to the cutter body 56 as a cutting edge, respectively. It is provided to use suitably according to the use.

In the drawaway tip 29, the upper surface 34 along the main cutting edge 33 is formed of the convex curved surface 37 and the concave curved surface 38, and the aforementioned convex curved surface 37 is formed. Since the top parts 38 and 39 are formed at a position biased toward the cutting edge tip 35 at the intermediate position 40 between the cutting edge tip 35 and the cutting edge rear end 36, The angle? Between the cutting edge tip 35 and the upper surface 30 is not unnecessarily increased as in the conventional art shown in FIGS. 14 to 16.

For this reason, it is not necessary to make large the inclination angle I in FIG. 19, and therefore, it is not necessary to enlarge the clearance angle of the cutting edge.

Therefore, sufficient seating rigidity and excellent cutting edge strength can be obtained, and also excellent cutting performance such as cutting resistance and less heat generated by cutting can be obtained.

In addition, the cutting edge rear end 36 of the convex curved surface 37 described above has the same height position as the upper surface 30 near the sub-cutting edges 31 and 32 adjacent to the cutting edge rear end 36. Since it is smoothly granulated as the concave curved surface 38, sufficient cutting margin for forming the same convex curved surface 37 and the concave curved surface 38 along the adjacent main cutting edge 33 can be ensured.

Thereby, the upper surface 34 different from all the main cutting edges 33 formed in each side part can be formed as the convex curved surface 37 and the concave curved surface 38, and it can be made highly economical have.

In addition, the above-mentioned concave curved surface 38 can be used to smoothly dispose the chip from the concave curved surface 38 through the granular surface 41.

In the drawaway tip 29, the shape is formed into a lozenge having an obtuse angle part and an acute angle part, and between the main cutting edge 33 and the sub cutting edges 31 and 32 described above. Coowner nose blades (60) and (61) are installed at the same time, and these coowner nose blades (60) and (61) can be used appropriately for various purposes as shown in FIGS. have.

7 shows another embodiment of the drawaway tip of the present invention.

The drawaway tip 42 is a parallelogram-shaped plate shape, and the sub cutting edges 44 and 44 are sub-cutting edges at the acute angles of the corner portions of the upper surface 43, respectively. 45 and 45 are formed, respectively.

And major cutting edge 46 is formed in the edge part between these sub cutting blades 44 and 45, respectively.

Moreover, between the said sub cutting edge 44 and the main cutting edge 46 which make up a blunt trunk, the co-own nose blade 62 also makes the said sub cutting edge 45 and main cutting which form an acute angle. Co-own nose blades 63 are formed between the blades 46, respectively.

And the upper surface 47 of the edge portion according to each of the main cutting edge 46 of the drawaway tip 42 is the same as the drawaway tip 29 shown in the above embodiment 1 The circumferential convex surface 50 extending from the cutting edge tip 48 of the cutting edge 48 to the cutting edge rear end 49 and forming the inclined surface of the main cutting edge 46 and the cutting of the convex curved surface 50. It is formed of the concave curved surface 51 which extends from the position of the blade rear end 49 to the vicinity of the sub cutting edge 44 and 45 of this cutting edge rear side.

The drawaway tip 42 having the above-described configuration is planar because the co-own nose blade 62 of each obtuse portion is attached to the cutter body 57 as a cutting edge as shown in FIG. As a cutting face milling cutter, as shown in FIG. 9, the co-own nose blade 63 of each acute angle portion is attached to the cutter body 58 as a cutting edge, respectively, as a shoulder cutting face milling cutter. In addition, as shown in FIG. 10, by attaching to the bite 59, it is provided to use suitably according to each use.

In the drawaway tip 42 of this embodiment, the same effect as that of the drawaway tip 29 shown in the above-described embodiment can be obtained, and as shown in FIG. Even in the state where (Ch °) is attached, the main cutting edge 46 formed on the long side thereof is used as the plane cutting type, and the main cutting edge 46 formed on the short side is used as the shoulder cutting type. The advantage is that the blade length in the infeed direction of the mold can be large.

As described above, the drawaway tip of the present invention forms a polygon in which the upper and lower surfaces are parallel to each other, and the secondary cutting edge is formed at each corner of the upper surface, and one end of the drawaway tip is located at the side portion between the secondary cutting edges. The upper cutting edge according to the main cutting edge of the drawaway tip formed by forming the main cutting edge which is formed in parallel with the sub cutting edge extends from one end of the main cutting edge to the other end, and the top cutting edge described above. The above convex curved surface at a position biased from one end to the other between the end portions of the convex curved surface and the sub cutting edge positioned in contact with the other end side of the main cutting blade described above and located at the other end side of the main cutting blade described above. It is formed as a concave curved surface extending to the upper surface, and the shape is formed into a rhombic or parallelogram shape, and the main cutting edge and the sub cutting edge described above. Amongst which will form the co-owner nose day.

Therefore, according to this drawaway tip, since the inclined surfaces of all the major cutting edges formed on each side portion can be formed into the convex curved surface, it is economical to obtain the excellent cutting performance possessed by the convex curved surface for all the major cutting edges. .

In addition, since the chip is smoothly removed according to the above-mentioned miscurved surface, it is possible to obtain an advantage in the chip processing.

Moreover, the advantage that it can be used for various uses can also be acquired by suitably using each coowner's blade formed in the obtuse angle part and the acute angle part.

Claims (1)

The upper and lower surfaces form a parallel polygon, and the sub-cutting blades 31 and 32 are formed at the corners of the upper surface 30, and one end of the sub-cutting blade is positioned at the side portion between the sub-cutting blades. In the drawaway tip 29 formed by forming the main cutting edge 33 which is continuous with one side of the sub cutting edge, the main cutting edge of the upper surface 34 in accordance with the main cutting edge 33 described above. The convex curved surface 37 extending from one end to the other end of the cutting edge and positioned at the one end side from the center between the two end portions of the main cutting blade, and the other end side of the main cutting blade of the convex curved surface. A concave curved surface 38 extending up to the upper surface 30 near the sub-cutting blades 31 and 32 located on the other end side of the main cutting blade, wherein the shape is rhombic or parallelogram-shaped. In addition to the above, the main cutting edge and the secondary cutting blade The nose throw-away tip, characterized in that the formation of the owner's nose edge 60, 61.