JPH02109610A - Throw away tip - Google Patents

Abstract

PURPOSE:To improve the life of a cutting edge at the time of cutting a material such as aluminum, etc., by covering at least a face with an abrasion resistant layer and cutting a flank to form the cutting edge into a sharp edge shape. CONSTITUTION:A throw away tip 11 provided on the cutter holder H1 of a face mill is formed into a regular hexahedral positive type. The top face 12 as a face is covered with approx. 4mum thick abrasion resistant layer 13 of TiN, etc. by thermal spraying and the peripheral face 14 as a flank is ground to form a cutting edge 15 into a sharp edge. As aluminum, etc. is machined by this milling cutter, since the cutting edge 15 is formed into a sharp edge shape by an abrasion resistant layer 13, the cutting resistance is small improving cutting quality, reducing heat generation at the time of cutting, while making it hard to form a built-up edge.

Description

[Detailed description of the invention] [Industrial use]! ! f ] The present invention relates to a throw-away tip on which a wear-resistant coating layer is formed.

[Prior Art] Conventionally, as shown in FIG. 12, this type of indexable insert has been thermally sprayed with a wear-resistant layer 3 such as TiN on the rake face 1 and the relief 2 to improve the durability of the cutting edge, etc. Products with improved abrasion resistance are known.

[Problems to be Solved by the Invention] However, the indexable insert has a problem in that when cutting a material such as aluminum, chipping occurs relatively early and the life of the cutting edge is shortened.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an indexable tip that improves the life of a cutting edge when cutting materials such as aluminum.

[Means for solving the problem] As a result of repeating various tests to achieve the above purpose, 1. In conventional indexable inserts, when the wear-resistant layer is applied, the cutting edge 4 inevitably curls as shown in FIG. As a result, built-up edges are likely to form, especially when cutting materials that are relatively easy to weld, such as aluminum.
It was found that chipping and the like occur due to the falling of the built-up cutting edge.

The present invention is based on the above findings, and the rake face is coated with a wear-resistant layer, and the flank face is ground to form a cutting edge in the shape of a sharp edge.

[Function] In this 4as, after coating the rake face with a dust wear-resistant layer, the flank face is ground to form a cutting edge in the shape of a sharp edge.

During cutting, the cutting edge is formed into a sharp edge shape, so there is less cutting resistance and less heat generation during cutting, which prevents the formation of built-up edges even with materials that are easy to weld, such as aluminum. (Become.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

In these figures, 11 is a throw-away tip provided on a cutter holder (It) of a face milling cutter, and this throw-away tip 11 is formed in a positive regular hexagonal shape. A wear-resistant layer 13 made of TiN or the like is thermally sprayed to a thickness of about 4 μm on the upper surface 12 as the flank surface, and the circumferential surface 14 as the flank surface is ground to form the cutting edge 15. It is formed into a sharp edge shape.

In the indexable tip 11 configured as described above, the IIw4 abrasion layer 13 is provided on the upper surface 12 and the peripheral surface 14.
After coating, the peripheral surface 14 is ground to finish the cutting edge 15 into a sharp edge shape.

In addition, when processing aluminum or the like with the above-mentioned milling cutter, the cutting edge 15 is wear resistant 113 and is formed in a sharp-edged shape, so the cutting resistance is reduced, the sharpness is improved, and the heat generated during cutting is reduced. A built-up cutting edge is less likely to be generated.

Therefore 1. According to the above-mentioned slow 7-way blade 11, since the built-up cutting edge is not generated, it is possible to reduce chipping, etc., which is thought to occur due to the falling off of the built-up cutting edge, and to extend the life of the cutting edge 15. In addition, since cutting resistance is reduced, minute vibrations caused by cutting resistance can be reduced, and the surface roughness, flatness, etc. of the workpiece can be improved. Since the wear-resistant layer 13 is coated, the wear resistance of the scoop 12 can be improved, and the frictional resistance of the scoop surface 12 is reduced, which improves chip evacuation. Moreover, since the circumferential surface 14 is processed by grinding, the dimensional accuracy of the circumferential surface 1417) can be improved, and the positional accuracy of the cutting blade 15 when attached to the cutter holder by applying the circumferential surface 14 is improved. In the above embodiment, the indexable tip is attached to the cutter holder H1 of the face milling cutter, but it can be attached to the cutting tool holder H2 as shown in FIGS. 5 to 7, for example, to cut the workpiece. The indexable tip 20 may be used to cut W, or may be attached to another holder or the like.

As shown in FIGS. 5 to 7, the slow seven-way tip 20 attached to the cutting tool holder H2 is formed in a diamond shape, and has a chip breaker 22 formed on the cutting edge 21. Good too. And this throw-away chip has at least chip breaker 2
2 is coated with a wear-resistant layer 23, and a peripheral surface 24 serves as a flank surface.
The cutting edge indexable tip may be one in which a auxiliary cutting edge 32 is formed in addition to the main cutting edge 31 as shown in FIGS. 8 and 9. This indexable tip has an upper surface 33 which is a rake surface.
is coated with a wear-resistant layer 34, and the circumferential surface 35 serving as the main cutting edge flank surface and the circumferential surface 36 serving as the minor cutting edge flank surface are ground to make the major cutting edge 31 and the minor cutting edge 32 sharp. Etsuji,
It is formed in the shape of Furthermore, the throw-away tip may be a negative type (for example, the 1st O
As shown in FIGS. 11 to 11, it may be of a negative type and include a chip breaker 41. This throwaway knob is formed into an 8-corner shape,
At least the upper and lower surfaces of the chip breaker 41 are coated with a wear-resistant layer 42, and a circumferential surface 43 serving as a flank surface is ground to form a cutting edge 44 in the shape of a sharp edge.

Further, in the above embodiment, TiN is used as the wear-resistant layer, but TiN may be used instead.

Further, the workpiece material is not limited to aluminum, and may be other materials that easily form a built-up edge, such as carbon steel.

[Experimental Example] Next, an experiment was conducted to examine the effect of the throw-away tip 11, and will be explained in comparison with a conventional product.

In this experiment, we machined automobile parts: (a) the flange surface of an intake manifold made of aluminum alloy, and (b) the gasket surface of a cylinder head made of aluminum alloy casting. The life spans of the conventional product and the product of the present invention were compared based on the number of cut parts. Note that the surfaces to be cut of the above-mentioned workpieces are all open with exhaust holes, holes leading to cylinders, etc., and the cutting is performed intermittently.

(Leaving space below) Table 1 Experimental Results As shown in the experimental results in Table 1 above, compared to conventional products, the product of the present invention has a lifespan of 8 times longer for intake manifolds and 2 times longer for cylinder heads. was confirmed.

[Effects of the Invention] As explained above, according to the present invention, since the cutting edge is formed into a sharp edge shape, there is less cutting resistance and heat generation during cutting is reduced, and it is possible to easily weld aluminum, etc. It is possible to make it difficult to form a built-up edge even with materials such as

Therefore, it is possible to reduce chipping, etc., which may be caused by falling off of the built-up cutting edge, and it is possible to extend the life of the cutting edge.

[Brief explanation of drawings]

1 to 4 are diagrams showing one embodiment of the present invention, in which FIG. 1 is a diagram showing the force of a face milling cutter and an indexable insert attached to a vine holder, and FIG. 2 is a diagram showing the same indexable insert. 3 is a side view of the indexable insert, FIG. 4 is an enlarged view of the cutting edge of the indexable insert, FIG. 5 is a diagram showing the indexable insert attached to the tool holder, FIG. 6 is a plan view of the indexable insert, FIG. 7 is a side view of the indexable insert, and FIGS. 8 and 9 are views of the indexable insert having a minor cutting edge. is a plan view, FIG. 9 is a side view, FIGS. 1O to 11 are views showing a negative type indexable tip having a chip breaker, FIG. 10 is a plan view, and FIG. 11 is a cross-sectional view. FIG. 12 is an enlarged view of the cutting edge of the indexable insert shown as a conventional example. 22.41...Chip breaker.

Claims (1)

[Claims] A throw-away tip characterized in that at least the rake face is coated with a wear-resistant layer, the flank face is ground, and the cutting edge is formed into a sharp edge shape.