JPS62251003A - Coated throwaway tip - Google Patents

Abstract

PURPOSE:To aim at the promotion of long service life in a tip, by performing coating treatment, commensurable to each cutting function of a cutting face and a flank, on the throwaway tip, and giving it wear resistance or damageproof and tipping resistance. CONSTITUTION:A monolayer and a compound layer of titanium carbide or titanium nitride or titanium carbide-nitride are formed at the cutting face side of a tip by means of a physical evaporation process. On the other hand, the first layer of the monolayer or the compound layer of these of titanium carbide or titanium nitride or titanium carbidenitride is formed at the flank side by means of a chemical evaporation process, and the outer layer side is formed by the physical evaporation process. Therefore, wear on a flank is little, while adhesive strength in a film on the cutting face comes so high, and service life in the tip is thus sharply prolonged thanks to a synergetic effect of these layers.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to improvement of a coated indexable insert used in a cutting tool, and more specifically, improvement of fracture resistance on the rake face side of the insert, This has been improved to reduce flank wear.

[Prior art]

Conventionally, a coating of titanium carbide or titanium nitride, etc., has been applied to the entire surface or part of the surface of an indexable tip used for cutting tools such as milling cutters, end mills, and cutting tools for cutting metal etc. by chemical vapor deposition or physical vapor deposition. It is well known that these materials are widely used because they improve wear resistance and extend chip life.

[Problem that the invention seeks to solve]

However, when a film is formed on the surface of the indexable insert described above by chemical vapor deposition, the film has good adhesion to the chip surface and has excellent wear resistance, but there are problems with chipping resistance and chipping resistance. Therefore, there is a risk that the coating on the tooth surface side of the tip, which receives a large cutting load during cutting, may be missing. In order to prevent these problems, a physical vapor deposition film with high toughness and excellent chipping resistance is formed, but this has problems with wear resistance, so the flank side of the insert is greatly worn during cutting.
It had problems such as:

[Purpose of the invention]

The present invention has been made in view of the above-mentioned problems, and improves wear resistance, chipping resistance, and chipping resistance by applying a coating treatment that suits the cutting function of the rake face and flank face of the indexable insert. The object of the present invention is to provide a coated indexable tip with excellent long life.

[Means for solving problems]

The present invention solves the above-mentioned problems by using the configuration described below.

That is, in an indexable insert used for a cutting tool, a single layer or a composite layer of titanium carbide, titanium nitride, or titanium carbonitride is formed on the rake face side by physical vapor deposition, and titanium carbide or titanium nitride is formed on the flank side. Alternatively, it is a coated indexable chip in which the first layer of a single layer or a composite layer of titanium carbonitride is formed by chemical vapor deposition.

[Action of the invention]

As mentioned above, the present invention involves forming a base material made of cemented carbide, cermet, or ceramics into a predetermined shape, and then applying physical vapor deposition to the surface that will become the rake surface when the tip is attached to the tool body. The film mentioned above is formed, and a film is formed on the flank side by chemical vapor deposition, and the film does not peel off due to the high adhesive strength of the tooth face film, which is subjected to repeated cutting loads. (
As a result, chipping and chipping can be prevented.

In addition, since the cutting load is smaller than that of the rake face, and wear prevention is prioritized on the flank face, a chemical vapor deposition coating with good wear resistance is applied, so flank wear is extremely reduced, and the synergistic effect of these This greatly extends the life of the chip.

Note that better results can be obtained if the first layer of the coating formed on the flank side is formed by chemical vapor deposition, and the outer layer is formed by physical vapor deposition.

〔Example〕

Examples will be described below.

Example ■ A titanium nitride film with a thickness of 2μ is formed on the scoop face of a model number 5NGN 120412 chip by physical vapor deposition, and a titanium carbide film with a thickness of 1μ is formed on the flank side by chemical vapor deposition, followed by a titanium nitride film with a thickness of 2μ. A sample A according to the present invention was prepared in which a . In addition, in order to compare with the product of the present invention through the tests described later, a comparative sample A was prepared by physically depositing a titanium nitride film with a thickness of 2μ on the entire surface of the chip with the model number "-", and a comparison sample was prepared by chemical vapor deposition on the entire surface of the same chip as described above. Comparative sample B, which had titanium carbide with a thickness of 2 μm and a titanium nitride layer with a thickness of 1 μm formed on the upper surface by physical vapor deposition, was also prepared.

The fire resistance of each of the above samples was tested under the following conditions.

Workpiece material: SCM445, workpiece shape 120X5
00L with four 4 mm wide slots formed on the outer circumference, circumferential speed = 120 m/mIn, depth of cut: 2
．． 5mm, test method: 100 impacts were applied to the chip, and if there was no abnormality, the feed was increased sequentially by 0.05 mm Zrev and this was repeated until the chip was chipped or chipped.

The above test results show that the average cumulative number of impacts before chipping for comparative sample A was 1658 (feed: 0.85 mm/r, v), and for comparative sample B, chipping occurred after 994 times (feed: 0.5 mm/rev). However, sample A according to the present invention was tested 1977 times (feed 1.0, . . .
Tests were conducted up to m/r, , ), but no abnormality was found and it was possible to continue testing.

Example ■ A titanium nitride film with a thickness of 2μ was formed on the square face of a model number 546N-R3G chip by physical vapor deposition, and a titanium carbide film with a thickness of 1μ was formed on the flank side by chemical vapor deposition.
Next, sample B according to the present invention was prepared by forming titanium nitride with a thickness of 1 μm by the same method, and further forming a titanium nitride layer with a thickness of 2 μm by physical vapor deposition.

In addition, in order to compare with the product of the present invention, we prepared a C comparison sample in which a titanium nitride film with a thickness of 2 μm was physically deposited on the chip surface of the above model number, and a 2 μm thick titanium nitride film was deposited on the surface of the chip with the same model number by chemical vapor deposition.
of titanium carbide and a thickness of 1 by physical vapor deposition on its upper surface.
A comparison sample D having a titanium nitride layer of μ was also made.

In order to test the wear resistance of each of the above samples, the tips were attached to a milling cutter and tested under the following conditions.

Milling model number: LC3NO405R (tested with 1 blade), work material 550C1 Circumferential speed: l 72 m/
min, feed: 0.26 mm/rev.

Depth of cut width x depth = 5Qmm x 3Qm+++, test method: Measured during flank wear after cutting for 30mIn.

The above test results show that the flank wear of the C comparative sample was 0.4
03 mm, sail 215 during flank wear of D comparison sample
The sail was 14 mm, whereas the B sample according to the present invention had a sail of 14 mm.
It was 2 mm.

〔Effect of the invention〕

As described above, the present invention has greatly improved the chipping resistance and chipping resistance of the tooth face of indexable inserts used in cutting tools, and has also greatly improved the flank wear on the flank side of the insert. This greatly extends the lifespan.

Claims (1)

[Claims] (1) In the indexable insert used for cutting tools, a single layer of titanium carbide, titanium nitride, or titanium carbonitride or a composite layer thereof is formed on the rake face side by physical vapor deposition, and a layer of titanium carbide is formed on the flank side. Alternatively, a coated indexable tip characterized in that the first layer of a single layer or a composite layer of titanium nitride or titanium carbonitride is formed by a chemical vapor deposition method.