JPH0231618U - - Google Patents

Description

[Brief explanation of drawings]

Fig. 1 is a front view of the indexable ball end mill according to the present invention, Fig. 2 is a side view thereof, Fig. 3 is a bottom view thereof, Fig. 4 is a front view of the main tip,
Figure 5 is a side view of the chip, Figure 6 is a front view of the secondary chip, Figure 7 is a side view of the chip, and Figure 8 is a diagram showing the chip seat of the main chip. A side view from below, FIG. 9 is a front view of a throw-away ball end mill with an auxiliary tip showing an application example of the present invention, FIG. 10 is a side view thereof, and FIG. 11 is a front view showing a modification of the auxiliary tip. , Fig. 12 is a partially omitted front view of the indexable ball end mill when the tip shown in Fig. 11 is set as the sub-chip;
Fig. 13 is a front view showing curved chamfering from the outer peripheral side of the main chip, and Fig. 14 is a view showing linear chamfering from the rake face side of the main chip.
15 is a partially omitted front view, b is a side view from diagonally below the right side, and FIGS. 15a, b, and c are side views showing modified examples of linear concave portions or convex portions on the bottom surface of the main chip. 1... Tool body, 2... Main chip, 3... Sub-chip,
3'...Modified example of sub-chip 3, 4...Axis center line, 5...
Chip seat, 10... Auxiliary chip, 21a, 21b,
31a, 31b...Circular inclined side surface, 22a, 22b
, 32a, 32b...linear inclined side surface, 23a, 2
3b...Intersection line, 24...Top surface, 25...Cutting edge portion, 26...
Chip bottom surface, 27...linear recess, 39a, 39b
...Short side side, 51...Side wall, 52...Bottom surface of chip seat,
53...Convex portion on the bottom of the chip seat.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A throw-away machine in which a positive-type tip with a hemispherical arc-shaped cutting edge rotation locus and a relief angle is mechanically attached to the tip ball portion of the tool body in a removable manner. In the type ball end mill, the tip consists of a main tip having a cutting edge extending to the vicinity of the shaft center, and a sub-chip having the same basic shape as the main tip and having a cutting edge except for the vicinity of the center, The chip has a substantially 1/4 circular arcuate inclined side surface and a straight line inclined side surface connected thereto in point symmetry, and an upper surface serving as a rake surface is a convex cylindrical curved surface, and the upper surface, the arcuate inclined side surface, and the The cutting edge is defined by the line of intersection with the linear inclined side surface, and one or more linear recesses or linear protrusions are provided on the mainly flat bottom surface, and the center of the recess or protrusion is Lines and,
The mounting angle θ, which is the angle formed by the linear inclined side surface on the intersection line side where the arcuate inclined side surface and the linear inclined side surface intersect, or the virtual extension of the side surface, on the intersection line side is 90
The auxiliary chips, which are arranged so as to intersect with each other at an angle of less than 100 degrees, and have the same basic shape as the main chip, have a similar shape that is approximately the same as the radius of curvature of the circular cutting edge of the main chip when viewed from above, and smaller than the main chip. The chip seat is arranged such that the linear inclined side surface and the bottom surface of the main and sub-tips intersecting with the arcuate inclined side surfaces, and the concave or convex portion provided on the bottom surface serve as the mounting reference surface for the chip. one or more protrusions or recesses that match the recesses or protrusions on the chip bottom surface are formed on the chip seat bottom surface which is flat with one side wall, and one or more of the main chips and one or more sub-chips are formed. A throw-away ball end mill that is equipped with. (2) In the throw-away ball end mill according to claim 1, the sub-chip has an approximately 1/4 circular arc inclined side surface, a linear inclined side surface connected thereto, and a linear inclined side surface that intersects with the linear inclined side surface at an angle of 90 degrees or more. It has a short side surface symmetrical with respect to a point, and consists of an upper surface of a convex cylindrical curved surface similar to the main chip, and a flat bottom surface, and is 90 degrees across the arcuate inclined surface on the side opposite to the arcuate inclined side surface. A throw-away ball end mill characterized in that a chip seat is formed such that a linear inclined side surface, a short side surface, and a flat chip bottom surface that intersect at the following angle serve as a chip mounting reference surface. (3) In the throw-away ball end mill according to claim 1 or 2, following the outer peripheral cutting edge portion formed as the intersection line of the linear inclined side surface and the upper surface of the main chip and/or the sub chip, A throw-away ball end mill characterized in that one or more auxiliary chips are provided offset in the axial direction so as to form an outer peripheral cutting edge on substantially the same rotation locus as the outer cutting edge.