JPH0685712U - Throw-away tip - Google Patents

Abstract

(57) [Summary] [Object] To provide a sharp-cutting insert having a square planar shape and having four cutting edges on one side or eight cutting edges on both sides. [Structure] A base point 15, a support surface 16, and a concave curved surface 17 are provided on each side surface of a chip 12 based on a square shape. Concave surface 1
The ridgeline formed by the upper surface 13 and the portion near the base point of 7 is the main cutting edge 19
The cutting edge 19 is provided with the rake face 18.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a throw-away insert for cutting ferrous metals or non-ferrous metals such as aluminum and copper alloys.

[0002]

[Prior art]

 11 and 12 show a throw-away tip disclosed in Japanese Patent Laid-Open No. 5-16011, in which each side surface of a rectangular flat plate-shaped chip 1 is a flat surface 9 orthogonal to the upper and lower surfaces 2 and 3. A concave curved surface 10 which is depressed from the flat surface 9 inward of the chip is formed, and a main cutting edge 11 is formed on the ridge line portion formed by the concave curved surface 10 and the upper and lower surfaces 2, 3.

[0003]

[Problems to be solved by the device]

 In the case of the above-mentioned prior art, the flat surface 9 which is the tip of the main cutting edge 11 has a part of the side of the quadrangle remaining, and moreover, in the thickness direction, that is, in the direction orthogonal to the upper and lower surfaces 2, 3. Since there is no inclination as shown in Fig. 12, when mounted on a face mill, both the most important true rake angle and the inclination angle of the cutting edge at the tip end become negative angles, and under the operating conditions in that range, There is a problem that resistance increases.

An object of the present invention is to provide a quadrangle throwaway tip having a rake face to improve the sharpness in order to solve the above-mentioned problems of the prior art, and further to use a quadrangle on both sides as a cutting blade. is there.

[0005]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention is a regular square planar shape consisting of an upper surface, a lower surface and four sides, and in a chip whose basic thickness is smaller than one side of the quadrangle, from each vertex of the quadrangle, The side of is the supporting surface leaving the side of the basic shape, and is a concave curved surface that is recessed in an arc shape from this supporting surface toward the base point continuing to the other apex angle, and the concave surface following the base point and the tip. The cutting edge is used as the ridgeline that intersects the upper surface of the. In addition, a rake face that is inclined so as to descend in the thickness direction in the direction orthogonal to the inclined ridge of the throw-away tip, or a portion that serves as the above-mentioned base point is formed at a predetermined angle smaller than the upper surface. One with a sloped Sarae surface, one with a chamfered Sarae surface, and a shape as if one pair of the above-mentioned throw-away tips were integrated by reversing one with respect to the other. Also adopted throwaway tip.

[0006]

[Action]

 A large number of indexable inserts of the present invention are fixed to the outer periphery of the face mill with an appropriate approach angle at regular intervals, and the face mill is rotated to cut the target workpiece. At the time of the above cutting, the cutting edge of each throw-away tip has a positive rake angle and a positive rake angle on the face mill, resulting in low cutting resistance and good sharpness.

[0007]

【Example】

 1 to 3 show a first embodiment of the present invention. In a chip 12 of this embodiment, the upper and lower surfaces 13 and 14 of the chip 12 are in the form of a regular quadrangle having sides shown by chain lines in FIG. One side from each apex angle is the base point 15, and the other side is the supporting surface 16 that coincides with each side, and the concave curved surface that reaches the base point 15 is formed by recessing from the supporting surface 16 in an arc shape. 17 is provided.

The angle between the side of the tip 12 and the base point 15 side of the concave curved surface 17 is defined as the main cutting edge inclination angle θ as shown in FIG. 1, and this portion descends toward the lower surface 14 as shown in FIG. The rake face 18 is thus inclined to form the main cutting edge 19.

Further, a mounting hole 20 having a tapered surface on the upper surface 13 side is provided in the center of the chip 12, and a portion from the base point 15 to the upper surface 13 side of the support surface 16 has a sloped surface as shown in FIGS. Alternatively, an R-shaped Sarae surface 7 is provided.

4 to 6 show a second embodiment of the present invention, in which a chip 21 of this embodiment has upper and lower surfaces 22, 23 in a planar shape based on a regular square as in the first embodiment. Then, two chips having the same shape as that of Example 1 are integrally molded so that the lower surface side of each chip is in close contact with the other by reversing the other with respect to one.

The end portions of the upper and lower surfaces 22 and 23 of the chip 21 on the opposite side of the respective side surfaces are support surfaces 26 and 27 which coincide with the side surfaces, and the opposite side is drawn in from the respective support surfaces 26 and 27. The base points 30 and 31 are provided, and between the support surfaces 26 and 27 and the base points 30 and 31, there are substantially curved concave surfaces 32 and 33 which are recessed toward the center of the chip 21.

As shown in FIG. 4, the angle formed by the side surfaces of the concave curved surfaces 32, 33 toward the base points 30, 31 is defined as the main cutting edge inclination angle θ, and this portion is inclined downward in the thickness direction. Then, the main cutting edges 36 and 37 are formed by forming the rake faces 34 and 35, and the sloped or R-shaped Sarae faces 24 and 25 are provided at the portions of the base points 30 and 31.

A mounting hole 39 having tapered surfaces on both sides is provided at the center of the chip 21.

7 and 8 show a state in which the tip 12 of the first embodiment is attached to the front milling cutter 40. In this figure, 41 is a screw for attaching the tip 12 to the front milling cutter 40, which is attached at a constant interval with an approach angle a of 45 °.

In the case of the first embodiment, since the main cutting edge 19 is formed at four places, the screw 41 is loosened according to the wear of the cutting edge 19, and the tip 12 is rotated 90 ° to rotate the screw 41. By tightening, one tip 12 can be used four times.

9 and 10, the tip 21 of the second embodiment is mounted on the front milling cutter 42 with the mounting screw 43, and the approach angle a is 45 ° as in FIG. 7.

In the case of this embodiment, since the upper and lower surfaces 22 and 23 are provided with four main cutting edges 36 and 37, respectively, the screws 43 are loosened in accordance with the wear of the main cutting edges 36 and 37, and the four By using the cutting blades 36 and 37 at the portions, one chip 21 can be used eight times.

[0018]

【effect】

 When the throw-away tip of this invention is mounted on a face mill, the cutting angle is smaller than the conventional one because the true rake angle and the inclination angle of the cutting edge are both positive rake angles due to its shape. , Sharpness is improved.

[0019] Therefore, for the processing of thin-walled structures such as cast iron, steel and non-ferrous metals, frame-shaped objects, and small parts such as engine cylinder blocks and cylinder heads, mission cases and suspensions for automobile parts. Optimal.

Further, in the first to fourth aspects, there are four cutting edges on one side, and in the fifth to eighth aspects, there are a total of eight cutting edges on both sides, so one chip is provided. It is extremely economical because it can be used 4 or 8 times.

[Brief description of drawings]

FIG. 1 is a plan view showing a chip of Example 1.

FIG. 2 is a side view of the above.

[Fig. 3] Similarly, a side view of the central longitudinal section

FIG. 4 is a plan view showing a chip of Example 2;

FIG. 5 is a side view of the above.

FIG. 6 is a perspective view of the same.

FIG. 7 is a partially cutaway vertical side view showing a mounting state of the first embodiment.

FIG. 8 is a partially cutaway front view of the above.

FIG. 9 is a partially cutaway vertical sectional side view showing a mounting state of the second embodiment.

FIG. 10 is a partially cutaway front view of the above.

FIG. 11 is a plan view showing an example of a conventional chip.

FIG. 12 is a vertical sectional side view of the above.

[Explanation of symbols]

 7 Sarae surface 12 Tip 13 Upper surface 14 Lower surface 15 Base point 16 Support surface 17 Concave curved surface 18 Rake surface 19 Main cutting edge 21 Tip 22 Upper surface 23 Lower surface 24 Sarae surface 25 Sarae surface 26 Support surface 27 Support surface 30 Base point 31 Base point 32 Concave curved surface 33 Concave curved surface 34 Rake surface 35 Rake surface 36 Main cutting edge 37 Main cutting edge

Claims (8)

[Scope of utility model registration request] 1. A chip, which has a basic shape of a regular quadrangle consisting of an upper surface, a lower surface, and four sides, and has a thickness smaller than one side of the quadrangle. The remaining support surface is used as a concave curved surface that is recessed in an arc shape from this support surface toward the base point continuing to the other apex angle. Throw-away tip featuring a blade. 2. The throw-away tip according to claim 1, further comprising a rake face that is inclined so as to descend in the thickness direction in a direction orthogonal to the inclined ridge line. 3. The throw-away tip according to claim 1, wherein a Sarae surface formed of a small slope at a predetermined angle with respect to the upper surface is provided at the base point portion. 4. The throw-away tip according to any one of claims 1 to 3, wherein the Sarae surface is chamfered. 5. A planar shape of a regular quadrangle consisting of an upper surface, a lower surface and four sides, having a thickness smaller than one side of the quadrangle, and from each vertex of the quadrangle, one side is a supporting surface leaving the side of the basic shape, From this support surface to a concave curved surface that is recessed in an arc shape toward the base point continuing to the other apex angle, and the concave curved surface following this base point, and the shape of the inclined edge line where the upper surface of the chip intersects the cutting edge A throw-away tip, characterized in that one pair is inverted with respect to the other and the lower surface side is integrally molded so as to be intimately integrated so that cutting edges are provided on both sides. 6. The throw-away tip according to claim 5, wherein a rake face is provided which is inclined so as to be lowered in the thickness direction in a direction orthogonal to the inclined ridgeline of each surface. 7. The throw-away tip according to claim 5, wherein a Sarae surface formed of a small slope at a predetermined angle with respect to the upper surface is provided at a base point of each surface. 8. The throw-away tip according to any one of claims 5 to 7, wherein each of the surfaces has a chamfered surface.