JPS6031846Y2 - groove cutting tool - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a grooving tool used for grooving a workpiece.

Conventional grooving bits have a cutting edge at the tip that is straight across almost the entire width. Since the powder is difficult to break, it can become entangled with successive chips to form one large lump, or wrap around the cutting tool or workpiece, causing not only cutting resistance but also damage to the workpiece surface.

Therefore, it is necessary to quickly remove the chips while cutting grooves, but as mentioned above, the chips are wide and difficult to break, making removal work difficult (this is why machine tools are becoming more automated or unmanned). This is an obstacle to promoting the project.

Furthermore, when removing chips wrapped around a workpiece, the chips are forcibly torn off, which can easily damage the machined surface.

The present invention was proposed in view of the above, and an object of the present invention is to provide a grooving tool that can reliably cut and cut into multiple strips so that chips can be easily removed.

In order to achieve this object distantly, the present invention is provided with a splitting blade that protrudes in the cutting direction of the cutting blade in the middle part of the cutting blade, and the splitting blade is such that the cutting blade is smaller than the workpiece due to the band-shaped chips. It is characterized by having a shape that shreds the band-shaped chips into multiple strips when it is cut out.

An embodiment of the present invention will be explained below with reference to the drawings.
First, in FIGS. 1 and 2, B indicates the groove cutting tool of the present invention, the blade portion 1 of which has a shape approximately corresponding to the cross section of the annular groove G to be formed in the workpiece W; The cutting edge 2 includes a straight blade 2a corresponding to the bottom surface of the groove G, and a triangular splitting blade 2b protruding from approximately the center of the straight blade.

The protruding length of the splitting blade 2b is set to be larger than the depth of cut into the workpiece W by the cutting blade 2, preferably approximately twice that length, and one side blade 3 of the cutting blade 2b is It is formed substantially parallel to the cutting direction A.

In order to form an annular groove G on the outer peripheral surface of the workpiece W, the workpiece W is mounted on a suitable lathe, rotated around its axis Cut deep.

At this time, since the depth of cut of the cutting blade 2 is controlled to be smaller than the protruding length of the splitting blade 2b, the cutting blade 2 can cut the workpiece W.
As shown in Fig. 3.4, the chips C cut out from the shavings can be shredded into two strips, Ca and Cb, by the splitting blade 2b, and the chips C, which are shredded in this way, are compared with each other. Because they are fragile, they can be easily shredded and removed.

By such grooving, a narrow groove is formed at the groove bottom by the splitting blade 2b, so the bottom of the groove to remove the narrow groove may be finished by cutting with a flat cutting tool, but depending on the purpose of the groove to be machined, In some cases (for example, when used as a seal member mounting groove), the thin groove does not need to be removed.

In the present invention, the number of tearing blades 2b provided on the cutting blade 2 is not limited to one, but a plurality of tearing blades 2b are provided at appropriate intervals depending on the width of the chips C to be shredded. The shape may be such that an undercut portion 4 is formed at the base thereof as shown in FIG. 5, whereby the chips C can be shredded more reliably.

As described above, according to the present invention, the cutting blade 2 is provided with a splitting blade 2b protruding in the cutting direction of the cutting blade 2 at the intermediate portion thereof, and the splitting blade 2b is such that the cutting blade 2 is connected to the workpiece W. Since it has a shape that shreds the band-shaped chips C into multiple strips Ca and Cb when cutting out the band-shaped chips C, the band-shaped chips C are cut by the cutting blade 2.
At the same time as cutting out the band-shaped chips C, the splitting blade 2b protruding in the cutting direction of the cutting blade 2 cuts a plurality of strips Ca, C.
b, and as a result, the chips C
can be easily shredded and removed, an increase in cutting resistance due to chips C and damage to the workpiece W can be prevented, and automation and unmanned machine tools can be achieved.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of one embodiment of the invention's cutting tool, Fig. 2 is a plan view of the cutting tool and the workpiece grooved by it, and Fig. 3 is a fragmentation of chips cut out by the invention's cutting tool. 4 is a perspective view of the chips, and FIG. 5 is a plan view of another embodiment of the cutting tool of the present invention. A: Cutting direction, B: Bit, C
...Cuts, Ca, Cb-...Shredded chips, G...Groove, W...Workpiece, 2...
...cutting blade, 2b... splitting blade.

Claims (2)

[Scope of utility model registration request] (1) The cutting edge 2 is provided with a splitting edge 2b protruding in the cutting direction of the cutting edge 2 in the middle part thereof, and the splitting edge 2b is
A grooving tool characterized by having a shape that cuts the band-shaped chips C into a plurality of pieces [at Cb] when cutting out the band-shaped chips C from the workpiece W. (2) The grooving tool according to claim 1, wherein the protruding length of the splitting blade 2b is greater than the depth of cut into the workpiece W by the cutting blade 2.