JPH02292108A - Throwaway end mill - Google Patents

Abstract

PURPOSE:To allow rear face machining for a (T) groove, even if small in height, in a throwaway end mill which is composed of a throwaway chip and a shank for fixing the chip by forming the throwaway chip into isosceles right triangle to install a cutting edge on the slope of the isosceles right triangle. CONSTITUTION:A throwaway end mill is made up with an isosceles-right-triangle throwaway chip 1, a shank 2 and a set screw 3, and the throwaway chip 1 has a cutting edge 1a installed on the slope portion of a isosceles right triangle. In case that the throwaway end mill is used to perform rear chamfering for a (T) groove 5a, the throwaway end mill held by a collet holder 6 can have a small edge height h1 because the throwaway chip is formed into isosceles right triangle. It is thus possible to perform chamfering even if the groove 5a has a small bottom height (H).

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the structure of a throw-away end mill that performs back chamfering after machining a T-groove or the like using a milling machine or machining center.

[Conventional technology]

In the conventional throw-away end mill for chamfering, the second
As shown in Figures (a), (b), and (c), the square throw-away tip 4 is fixed with a set screw 3 at a position where its cutting edge forms an angle of 45° with the axis of the shank 2. It had been.

[Problem to be solved by the invention]

Since the throw-away tip 4 in the conventional throw-away end mill described above is square, the T formed on the workpiece 5 by the conventional throw-away end mill held in the collet holder 6, as shown in FIG. Groove 5a
When chamfering the inner side of
Since the height H of the T-groove 5a is large, each tip of the blade touches the bottom of the T-groove 5a, which has a small bottom height H, resulting in damage to the bottom surface of the T-groove.

An object of the present invention is to provide a throw-away end mill that solves the above problems. [Differences between the Invention and the Prior Art] Compared to the conventional throw-away end mill described above, the throw-away end mill according to the present invention has a different shape in that the throw-away tip is a right-angled isosceles triangle.

[Means to solve the problem]

In order to achieve the above object, the present invention includes a throw-away tip, a shank that fixedly holds the throw-away tip,
In a throwaway end mill comprising a set screw fixing the throwaway tip to the shank, the shape of the throwaway tip is configured to be a right isosceles triangle, and the cutting edge of the throwaway tip is set to the hypotenuse of the right isosceles triangle. This is what we have in our department. [Example] Next, the present invention will be described with reference to the drawings.

FIG. 1(a) is a side view showing the throw-away end mill of the present invention, FIG. 1(b) is a bottom view thereof, and FIG. 1(c) is a perspective view showing the throw-away tip of the throw-away end mill according to the present invention. It is.

In the figure, the present invention has a T-groove with an extremely low T-groove bottom height H (
The present invention provides a throw-away end mill that can easily perform back chamfering (below 5), and as shown in FIG. The mill has a throw-away tip 1 with a right isosceles triangular shape, a shank 2,
It consists of a set screw 3 that fastens and fixes the throwaway tip 1 and shank 2.

The feature of the present invention is that the shape of the throw-away insert 1 is a right-angled isosceles triangle as shown in FIG. It is something.

FIG. 3 is a processing diagram showing back chamfering of a T-groove using the throw-away end mill according to the present invention. In the throw-away end mill of the present invention held by the collet holder 6, the shape of the throw-away tip 1 is a right isosceles triangle, so the blade height h is extremely small. Therefore,
It can be applied to chamfering T-slots with small bottom height H (5 am or less), which cannot be processed with conventional throw-away end mills.

Further, it may be used as a throw-away end mill equipped with a plurality of throw-away tips 1 of the present invention. In this case, the amount of cutting per tip is reduced, which is effective when chamfering a large amount at one time.

〔Effect of the invention〕

As explained above, the throw-away end mill according to the present invention has the advantage that by forming the throw-away tip into a right-angled isosceles triangle, it is possible to perform back chamfering of a T-groove with an extremely small height of the T-groove bottom.

[Brief explanation of drawings]

FIG. 1(a) is a side view showing one embodiment of the present invention, FIG. 1(b) is a bottom view of the same, FIG. 1(c) is a detailed perspective view showing the throw-away tip of the present invention, and FIG. Figure (a) is a side view of a conventional throw-away end mill, Figure 2 (b) is a bottom view of the same, Figure 2 (c) is a detailed perspective view of a conventional throw-away tip, and Figure 3 is the invention of the present invention. Fig. 4 is a processing diagram using a conventional throw-away end mill. 1... Throwaway tip 2... Shank 3.
...Set screw 5...Workpiece 5a...
・T groove 6...Collet holder (b) Fig. 1 (a) Cb) (Fig. 2 Fig. 3)

Claims (1)

[Claims] (1) In a throwaway end mill consisting of a throwaway tip, a shank that fixes and holds the throwaway tip, and a set screw that fixes the throwaway tip to the shank, the shape of the throwaway tip is a right-angled isosceles triangle. A throw-away end mill characterized in that the cutting edge of the throw-away tip is located on the hypotenuse of the right-angled isosceles triangle.