JPH0623373Y2 - Throw-away tip for face milling - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a throw-away tip for face milling, in which the shape of the cutting edge is improved so as to be particularly suitable for cutting steel materials.

(Prior Art) Conventionally, in a throw-away tip for face milling, a negative tip or a positive tip is incorporated to perform cutting. In particular, as the one incorporating a positive tip, as shown in, for example, Japanese Utility Model Publication No. 53-25908 and Japanese Utility Model Publication No. 59-151616, the axial rake angle is increased to reduce the cutting resistance. ing. The rake angle in the radial direction is set to 0 ° to a negative angle in order to secure the chip strength and the cutting discharge property.

Further, regarding a wiper tip for face milling in consideration of finish cutting, as disclosed in, for example, U.S. Pat. No. 3,486,211, four corner portions of a square plate-like tip are formed with triangular inclined surfaces. Then, it is known that the straight cutting edge remaining in the central portion is used as a finishing edge. In this case, the inclined surface is a chamfer for forming an inclined ridge of escape from the viewpoint of the cutting function, and if necessary, shortens the length of the cutting edge ridge remaining in the center to prevent chattering. It is something to reduce.

(Problems to be solved by the invention) However, in the former two publications, by increasing the rake angle in the axial direction, the clearance angle is naturally large and the blade angle is small, so that the material of high hardness is For cutting, etc.,
There is a problem that chipping easily occurs near the front cutting edge.
Further, if the rake angle in the axial direction and the rake angle in the radial direction are both made into a regular angle in consideration of reduction of cutting resistance, there is a problem that chipping increases due to insufficient cutting edge strength.

Further, although the above-mentioned wiper tip has a common point in terms of shape, it has a problem that the purpose is obviously different in terms of cutting function and cannot be applied as it is.

In view of the above, the present invention is configured to increase the substantial blade angle to prevent chipping in the vicinity of the front cutting edge.

(Means for Solving the Problem) The present invention has been made in view of the above-mentioned points, and is intended to improve the cutting edge structure in the corner portion on the premise of a positive tip made of a triangular plate or a rectangular plate. is there.

That is, the chamfer surface that forms at least the front cutting edge ridge and the sub cutting edge ridge is provided on the side surface of the corner portion, and the negative land surface is provided on the upper surface of the corner portion. And, the negative land surface and the upper surface, when assembled in the cutter body,
Both form positive axial rake angles AR ₁ , AR ₂ . The negative land surface has a negative inclination angle α in the orthogonal direction of −5 ° to −25 ° with respect to the front cutting edge, and a parallel distance 1 to the intersection with the main cutting edge is 0.5. ~ 3m
It is set within the range of m.

(Operation) When the throw-away tip for face milling of the present invention is assembled in the cutter body, both the negative land surface and the top surface formed in the corner portion form positive axial rake angles AR ₁ and AR ₂ for cutting. Get involved in. Therefore, the existence of the negative land surface increases the actual blade angle,
Defectability increases near the front cutting edge.

(Embodiment) An embodiment of a throw-away tip for face milling of the present invention will be described below with reference to the drawings.

1 to 3 show a state in which the throw-away tip (1) for face milling according to the present invention is incorporated in the cutter body (2).
(1) is, for example, a locator (4) located in the mounting groove (3)
It is placed in the tip seat (5) of the and fixed by the wedge piece (6). In this case, the locator (4) and the wedge piece (6) are fixed by the tightening screws (7) and (8), respectively.

Then, the throw-away tip (1) is incorporated into the cutter body (2) with the axial rake angles AR ₁ , AR ₂ as shown in FIG. 1. As shown in FIGS. 4 (a) to 4 (d), a positive type quadrangular plate is used as a basic shape, and chamfer surfaces (11) (12) and negative land surface (13) are formed at the corners thereof. It

And this chamfa surface (11) (12) and negative land surface
The front cutting edge (14) and the sub cutting edge (1
5) is formed. Therefore, the main cutting edge ridge (16) is formed by the intersection ridge of the negative land surface (13) and the inclined side surface (17) and the intersection edge of the upper surface (18) and the inclined side surface (17).

In the illustrated case, the negative land surface (13) has the parallel distance l to the bending point of the main cutting edge (16), the negative inclination angle α and the intersection with respect to the front cutting edge (14) in the case of the figure. Set by the angle β. Further, a clearance angle A, a clearance angle B, and a clearance angle C are given to the inclined side surface (17) and the chamfer surfaces (11) and (12), respectively.

Therefore, the blade angle at the front cutting edge (14) increases from θ ₀ to θ due to the existence of the inclination angle α, and the fracture resistance is enhanced.

Throw-away tip (1) constructed in this way
For example, the clearance angle A is A> 13 ° and the clearance angle B is 11 °
If <B <30 °, the following numerical range is suitable.

−5 °>α> −25 ° 0.5 mm <l <3 mm 0 ° <β <70 ° Further, FIGS. 5 (a) and (b) show the negative land surface (13) formed in two steps. 6 (a) and 6 (b), the negative land surface (13) is a cylindrical surface having a radius of curvature R. In this case, in FIGS. 5A and 5B, the blade angle can be increased from θ ₀ to θ, and the fracture resistance can be improved. Figure 6 (a) (b)
The inclination angle α of the negative land surface (13) at is shown as the angle in the tangential direction with respect to the radius of curvature R.

Further, FIGS. 7 (a) and 7 (b) show that the negative land surface (13) is constituted by a part of the conical surface, and FIGS. 8 (a) to 8 (d) are shown.
Is a left and right hand type in which the sub cutting edge ridges (15) are formed on both sides of the front cutting edge ridge (14) respectively. Therefore, the throw-away tip shown in FIGS.
In (1), the corner angle CA is set to 45 ° with respect to the work material (20) as seen in FIG. 3, and the intersection angle β is also set to 0 ° accordingly.

9 (a) to 9 (d) are applied to the throw-away tip (1) forming a triangular plate. Regarding the throw-away tip (1) shown in FIGS. 8 (a) to (d) and FIGS. 9 (a) to (d), the negative land surface (13) has two steps, It can be changed to a cylindrical surface or a conical surface.

The cutting edge ridge of the throw-away tip (1) is subjected to honing during cutting. In this case, as the honing, for example, an angle honing of 0.02 to 0.20 mm × 15 ° to 35 ° is applied.

(Effect of the device) The throw-away tip for face milling cutter of the present invention thus configured has a negative land surface (13) at the corner.
And the chamfer surface (11) (12) is formed, so the front cutting edge (14), the auxiliary cutting edge (15) and the main cutting edge (16)
The fracture resistance of is improved.

Therefore, there is an advantage that heavy cutting can be effectively performed in a face mill having a positive axial rake angle.

[Brief description of drawings]

FIG. 1 is a partial front view showing an embodiment in which a throw-away tip for face milling of the present invention is incorporated into a cutter body,
FIG. 2 is a partial top view, FIG. 3 is a cross-sectional view of an essential part, and FIG.
FIGS. (A) to (d) are views showing a throw-away tip for face milling of the present invention. FIG. 4 (a) is a front view, FIG. 4 (b) is a side view from below, and FIG. c) is a partial sectional view taken along line cc in FIG. 4 (a), and FIG. 4 (d) is also FIG. 4 (a).
Partial sectional view taken along line d-d in Fig. 5, Fig. 5 (a)
(b) is a figure which shows the modification of the throw-away tip for face milling, FIG.5 (a) is a front view, FIG.5 (b) is obtained along the bb line in FIG. Partial sectional view, Fig. 6 (a) (b)
FIG. 6 is a view showing another modified example, FIG. 6 (a) is a front view and FIG. 6 (b).
Is a partial sectional view taken along line bb in FIG. 6 (a), and FIGS. 7 (a) and (b) are views showing another modification.
Is a front view, FIG. 7 (b) is a side view, FIGS. 8 (a) to (d) are views showing still another modification, and FIG. 8 (a) is a front view and FIG.
8 (b) is a side view from below, FIG. 8 (c) is a cross-sectional view taken along line cc in FIG. 8 (a), and FIG. 8 (d) is also FIG. 8 ( a) a partial sectional view taken along line d-d in a),
FIGS. 9 (a) to 9 (d) are views showing still another modified example.
Figure (a) is a front view, Figure 9 (b) is a side view from below, and Figure 9
(c) is a partial sectional view taken along line cc in FIG. 9 (a), and FIG. 9 (d) is also taken along line dd in FIG. 9 (a). FIG. (1) …… Throw-away tip (2) …… Cutter body, (11) (12) …… Chamfer surface (13) …… Negative land surface, (14) …… Front cutting edge (15) …… Sub cutting Edge, (16) …… Main cutting edge (17) …… Inclined side surface, (18) …… Top surface

Claims (1)

[Scope of utility model registration request] 1. A triangular plate or a quadrangular plate is used as a basic shape, and a front cutting edge ridge (1
4) and chamfered surfaces (11) (12) forming at least the secondary cutting edge (15) are provided, and the upper surface (1
8) is a throw-away insert for a positive type face milling machine provided with a negative land surface (13), wherein the negative land surface (13) and the upper surface (18) are cutter bodies.
When incorporated in (2), they both form a positive axial rake angle AR ₁ , AR ₂ , and the negative land surface (13) is based on the front cutting edge (14), in the orthogonal direction. Negative tilt angle α is -5 ° to -25
And the parallel distance l to the intersection with the main cutting edge (16)
Throw-away tip for face milling that is set within the range of 0.5 to 3 mm.