JP2503532Y2 - Throwaway Face Milling - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a throwaway type face milling machine in which an octagonal plate-shaped throwaway tip is attached to the outer peripheral portion of the tip of a tool body.

[Conventional technology]

FIGS. 4 to 7 show a conventional throwaway type face mill equipped with a throwaway chip having an octagonal plate shape, and reference numeral 1 denotes a tool body in the drawings.

The tool body 1 is attached to a main shaft of a milling machine or the like, and has a cylindrical mounting portion 2 that rotates around a rotation axis O,
It is composed of a head 3 formed at the tip of the mounting portion 2. The head 3 is in the shape of a thick disk, and three tip pockets 4 having a concave shape are formed on the outer peripheral portion of the tip end thereof at equal intervals in the circumferential direction. A groove-shaped chip mounting seat 5 is formed on the wall surface of each chip pocket 4 in the direction of rotation, and a throwaway chip (hereinafter referred to as a chip) 6 is mounted on the chip mounting seat 5.

The chip 6 is in the shape of an octagonal plate whose upper surface is a rake surface 7 and whose lower surface is a seating surface 8. Cutting edges 10a to 10h are formed on eight ridges of the rake face 7, and sub cutting edges 10s are formed between adjacent cutting edges. The chip 10 has a tool body 1 with a corner angle of the cutting edge 10a of approximately 4
It is installed so that it becomes 5 °. Also, chip 6
As shown in FIG. 6, a taper portion is provided on the upper surface side in the central portion of
A mounting hole 11 is formed in which 11a is formed.

The chip 6 has a seating surface 8 and cutting edges 10d, 10f.
The side faces 9a and 9b along the side are brought into contact with the bottom face 5a and the side walls 5b and 5c of the chip mounting seat 5, respectively, and the head is brought into contact with the tapered portion 11a of the hole 11 so that the mounting bolts 12 tightened and detachable Is attached to.

[Problems to be solved by the invention]

By the way, when cutting is performed as shown in FIG. 7 using the conventional slow-away type front milling cutter, a cutting load acts on the cutting edges 10a, 10g and the cutting edge 10h of the chip 6 during cutting. Here, the cutting load acting on the cutting edges 10a, 10h is received by the bottom surface 5a and the side walls 5b, 5c of the chip mounting seat 5,
Since there is no wall surface in the chip mounting seat 5 that receives the component force F of the cutting load acting on the cutting edge 10g in the direction orthogonal to the rotation axis O, this component force F is received by the mounting bolt 12, and therefore,
When cutting is performed at high rotation and high feed, the chip 6 moves toward the outside of the tool body 1 in the direction orthogonal to the rotation axis O, and as a result, the mounting bolt 12 bends and
There is a problem that the cutting accuracy is reduced.

When cutting in a direction orthogonal to the rotation axis O, the cutting edge 10c inclined with respect to the rotation axis O also cuts. In this case, the cutting load acting on the cutting edge 10c is in the rotation axis O direction (head portion). Due to the component force in the direction of the tip surface 3), the problem that the tip 6 moves in the direction of the rotation axis O also arises.

This invention aims at solving the above-mentioned problems.

[Means for solving problems]

The throwaway type face milling machine of the present invention is an octagonal plate in which at least eight cutting edges are formed on the ridge line portion of the upper surface to be a rake surface in a tip mounting seat formed on the outer peripheral portion of the tip of a cylindrical tool body. The indexable insert, which is shaped like a table, is attached with the mounting bolts with the lower surface that is the seating surface abutting the tip mounting seat, and the cutting load causes the cutting load to be directed to the inside and outside of the tool body and the rotation axis. In a throw-away type face milling machine that acts toward both sides in the direction, a convex portion is formed on either one of the seating surface of the throw-away tip and the mounting bolt around the tip mounting seat on which this seating surface abuts. In addition, a hole is formed on the other side so as to fit with the convex portion.

[Operation] In the throwaway type face milling machine having the above-described configuration, the movement of the chip on the chip mounting seat is prevented by the hole and the convex portion, so that the tool main body moves in the direction orthogonal to the rotation axis of the tool main body. Even if a cutting load is applied to the outside of the, the mounting bolt does not bend and the tip does not move.

〔Example〕

1 to 3 show an embodiment of a throwaway type front milling cutter according to the present invention, in which the same components as those shown in FIGS. 4 to 7 are designated by the same reference numerals. The description is omitted.

The throwaway type front milling cutter shown in FIGS. 1 to 3 is different from that shown in FIGS. 4 to 7 in the mounting structure of the chip 6.

That is, in the throwaway type face milling machine of this example, a circular hole portion 20 having a larger diameter than the hole portion 11 is formed in a portion of the seating surface 8 of the chip 6 where the mounting hole portion 11 is opened.
Are formed.

Further, a columnar convex portion 21 that engages in the hole portion 20 is formed at a position facing the hole portion 20 on the bottom surface 14 of the chip mounting seat 5.

Then, the chip 6 has the protrusion 21 in the hole 20.
And attach the mounting bolt 12 to the head with the hole 11
It is fixed in the chip mounting seat 5 by being brought into contact with the tapered portion 11a and tightened in the tool body 1.

In the throwaway type face milling machine having the above-mentioned configuration, the cutting shaft 10g and the rotation axis O of the tool body 1 are cut at the time of cutting.
Even if a cutting load is applied to the outside of the tool body 1 in a direction orthogonal to the direction, the holes and the projections 20 and 21 prevent the chip 6 from moving on the chip mounting seat 5, so that the chip 6 is rotated about the rotation axis O. There is no movement toward the outside of the tool body 1 in the direction orthogonal to the direction. Therefore, even when cutting is performed at high rotation and high feed, the mounting bolt 12 does not bend or the cutting accuracy does not deteriorate unlike the conventional one.

In the above embodiment, the hole 20 is formed on the seating surface 8 of the throwaway chip, and the projection 21 is formed on the bottom surface 5a of the chip mounting seat 5.
However, conversely, the convex portion 21 may be formed on the seating surface 8 and the hole 20 may be formed on the bottom surface 5a.

Further, in the above embodiment, the case where the columnar convex portion 21 and the hole portion 20 that engages with this is formed has been described, but the prismatic or elliptical columnar convex portion and the hole portion that engages with this are formed. May be.

[Effect of device]

As described above, according to the throwaway type face milling machine of the present invention, a convex portion is provided on one of the seating surface of the chip and the tip mounting seat of the tool body with which the seating surface abuts, around the mounting bolt. Since the holes that fit with the protrusions are formed on the other side, the mounting bolts do not bend even if a cutting load is applied in any direction by these holes and protrusions, and the tip is Movement of the tip on the mounting seat is prevented.

Therefore, the chip does not move even if the cutting is performed in an arbitrary direction such as a direction orthogonal to the rotation axis at high rotation and high feed, so that the cutting can be performed with good processing accuracy.

[Brief description of drawings]

1 to 3 show an embodiment of the throwaway type front milling cutter of the present invention. FIG. 1 is a side sectional view of a chip mounting portion, FIG. 2 is a front view of the chip, and FIG. Is a side sectional view of the chip, and FIGS. 4 to 7 show an example of a conventional throwaway type face mill.
FIG. 5 is a front view of a throwaway type front milling cutter, FIG. 5 is a plan view of the same, FIG. 6 is a side sectional view of a chip mounting portion, and FIG. 7 is a sectional view showing a state of cutting a work material. . 1 ... Tool body, 5 ... Chip mounting seat, 6 ... Chip (throwaway chip), 7 ... Top surface (rake surface),
8: lower surface (seating surface), 10a to 10h: cutting edge, 20: hole, 21: convex.

Continuation of the front page (56) References Shown 60-175516 (JP, U) Shown 49-35475 (JP, U) Shown 61-102414 (JP, U) Shown 60-22218 (JP , U) Showa 58-173405 (JP, U) Showa 61-16214 (JP, U)

Claims (1)

(57) [Scope of utility model registration request] 1. An indexable throwaway having an octagonal plate in which at least eight cutting edges are formed on a ridge line portion of an upper surface serving as a rake surface on a tip mounting seat formed on a tip outer peripheral portion of a tool body having a cylindrical shape. The tip is attached with the mounting bolts with the bottom surface that is the seating surface abutting the tip mounting seat, and the cutting load is applied to the inside and outside of the tool body and both sides in the rotation axis direction by cutting with the cutting edge. In the throw-away type front milling cutter that acts toward, the seating surface of the throw-away tip and the tip mounting seat on which the seating surface abuts, around the mounting bolt,
A throw-away type face milling machine, characterized in that a convex portion is formed on one of them and a hole portion that fits with the convex portion is formed on the other.