JPH04256512A - End mill - Google Patents

Abstract

PURPOSE:To make a cutting head 2 fitted to a tool main body 1 changeable, and heighten the deflection accuracy of the edge of a blade. CONSTITUTION:A central mounting hole 5 extending in an axial direction is drilled in a tool main body 1 forming a cylinder shape, and a cutting head 2 is mounted to the top end part of this central mounting hole 5. This cutting head 2 possesses a small diameter shaft 4, and this small diameter shaft 4 is mounted to a taper collet 6 inside the central mounting hole 5. This taper collet 6 performs chucking of the small diameter shaft 4 of the aforementioned cutting head 2 by pulled by a hauling bolt 8 fitted inside the aforementioned central mounting hole 5. As a result of this, the cutting head 2 in itself becomes changeable, and the deflection accuracy of the edge of a blade is heightened since it is mounted by means of the taper collet 6.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an end mill, and more particularly to an end mill in which a cutting head equipped with a cutting edge is replaceable.

0002

[Prior Art] Conventionally, this type of end mill has been known, for example, as seen in Japanese Utility Model Publication No. 61-31776.
The mainstream method is to fix the chip with a hole using a mounting screw.

0003

[Problems to be Solved by the Invention] However, although the above-mentioned method has the advantage of a simple mechanism, it is also considerably inferior in run-out accuracy and circular arc accuracy compared to solid type tools. there were. In addition, there are many limitations on the number of teeth, so there is a problem that it cannot be applied to machining that requires high precision and high feed rate, such as mold finishing.

0004

[Means for Solving the Problems] The present invention has been made in view of the above-mentioned points, and includes a center mounting hole that penetrates in the axial direction at one end of a rod-shaped tool body, and a center mounting hole that penetrates through the tool body in the axial direction. The cutting head is configured such that the small diameter shaft of the cutting head can be received at its tip side via a tapered collet. This cutting head is configured to be fixed as the taper collet is towed by a towing bolt inserted into the center mounting hole.

[0005]

[Operation] In the end mill of the present invention, the cutting head is fixed by a taper collet and a traction bolt, so that the cutting head itself can be replaced.

[0006]

[Embodiment] An embodiment of the end mill of the present invention will be described below with reference to the drawings.

In FIGS. 1 to 3, reference numeral 1 denotes a rod-shaped tool body. A cutting head 2 is attached to one end of the tool body 1, and a shank 3 is integrally connected to the other end. This is what is meant to be done.

In the illustrated case, the cutting head 2 is a ball end mill with a cutting edge 3a formed therein, and a small diameter shaft 4 formed at the end of the cutting edge 3a, as shown in FIG. The small diameter shaft 4 of the cutting head 2 is attached to a taper collet 6 in a center attachment hole 5 that passes through the tool body 1 in the axial direction.

The taper collet 6 is shown in FIGS. 1 and 3.
It has a tapered sleeve shape, as seen in
A slit 7 extending halfway in the axial direction is formed,
A traction bolt 8 inserted into the center mounting hole 5 from the rear
It is driven by In this case, traction by the traction bolt 8 is obtained by screwing the tip end thread 10 of the traction bolt 8 into the inner circumferential thread 9 provided on the taper collet 6.

In FIG. 4, an inner peripheral flange 11 is formed at the rear end of the taper collet 6, and this inner peripheral flange 11 is secured to an outer peripheral flange 12 of the traction bolt 8. Therefore, this traction bolt 8 has a rear end thread 13, and unlike the one shown in FIG.

Furthermore, FIG. 5 shows a modification of the cutting head 2, in which a cutting edge portion 3 is formed as a square end mill.

0012

[Effects of the Invention] As explained above, in the present invention, since the cutting head 2 can be fixed by the taper collet 6 and the traction bolt 8, the cutting head 2 itself can be replaced. .

In addition, since it is mounted by the taper collet 6, the run-out accuracy of the cutting edge is increased, and the structure of the cutting edge 3 can be formed in the same manner as a solid type, so there is an advantage that there is no restriction on the number of teeth. have

[Brief explanation of the drawing]

FIG. 1 is a front view with half of one side cut away showing an embodiment of the end mill of the present invention;

[Figure 2] Side view,

[Fig. 3] An enlarged cross-sectional view taken along line AA' in Fig. 1;

FIG. 4 is a partial front view with one half cut away showing another embodiment of the end mill of the present invention;

FIG. 5 is a partial front view showing a modification of the cutting head section.

[Explanation of symbols]

1 Tool body 2 Cutting head 5 Center mounting hole 6 Taper collet 8 Towing bolt

Claims (1)

[Claims] [Claim 1] A small diameter shaft 4 of a cutting head 2 is received through a taper collet 6 at the tip side of a central mounting hole 5 provided at one end of a rod-shaped tool body 1 and penetrating in the axial direction. In addition, the end mill is characterized in that the cutting head 2 is fixed by the tapered collet 6 being pulled by a traction bolt 8 located in the center attachment hole 5.