JPS6284903A - Surface coated cutting tip made of cemented carbide - Google Patents

Abstract

PURPOSE:To enable a cutting tip to improve its life, by forming the coated surface into either the face of flank or into the both to a smooth surface in surface roughness of 1.6mum or less, in the cased of the surface coated cutting tip made of cemented carbide. CONSTITUTION:The surface of a cutting tip of material, based from WC radical cemented carbides, is coated with a hard layer consisting of a single layer of one kind or plural layers of two kinds or more of TiC, TiCn, TiNO, TiCNO and Al2O3. Said surface is smoothly processed in a vibrating barrel of Al2O3 made medium of 5mm average grain size by the wet method with a three time/ second frequency and 5mm amplitude, and if surface roughness if formed into the maximum height of 1.6mum or less, preferably 0.8mum or less, the cutting tip improves to a higher degree its wearing resistance while life as compared with those applying no process.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention has excellent durability in practical use. It is related to a cutting tip equipped with cemented carbide, which exhibits wear resistance and prolongs the cutting life.

[Conventional technology]

Conventionally, tungsten carbide (WC)1. ! The surface of the hardened single body of T1 was coated with T1 carbides, carbonitrides, carbonates, nitrides, carbonitrides, and aluminum oxides (hereinafter referred to as Ti and Ti).
C, TiN, TiCN, TiCo.

Ti No, and Ti CNO, and A9.203
A b-face coated 7ζ cemented carbide cutting tip coated with a hard layer consisting of one type of single layer or two or more types of double layers shown in -) is used as a cutting tool for various types of cutting. [Problem to be solved by the invention] However, the above-mentioned conventional surface-coated cemented carbide cutting inserts
When this is put into practical use, the cutting strip 1'1 causes either or both of the rake face and relief face of the cutting edge to wear out in a relatively short period of time, and the current situation is that the desired cutting life is not achieved. It is.

(Means for Solving the Problems) Therefore, from the above-mentioned viewpoints, the present inventors conducted research to improve the wear resistance of the above-mentioned conventional surface-coated cemented carbide cutting tips. The above conventional surface 'm, the surface of the cutting tip made of super-coated hard alloy is 1.8 in maximum height measurement.
It has a rough surface with a surface roughness of ~5 μm, but the maximum height measurement is 1.6 μm or less, preferably 0.8 μm.
Assuming a smooth surface with a surface roughness of less than m, the surface i1!
We have discovered that the wear resistance of coated cemented carbide cutting tips has been further improved, and the cutting life has been extended.

This invention was made based on the above knowledge, and the surface of the WCC cemented carbide base material is made of TiC, TiN.
, Ti CN, Ti Co, Ti No.

At least one of the rake face and the flank face, or both, of a surface-coated cemented carbide cutting tip coated with a hard layer consisting of a single layer or a multilayer of two or more of TiCNO and AffizO3. By making the cutting tip (that is, the most worn part of the cutting edge) a smooth surface with a surface roughness of 1.6 μm or less, preferably 0.8 μm or less as measured by the maximum height, This cutting tip is characterized by a surface-coated cemented carbide cutting tip that improves the wear resistance of the surface and thereby extends the cutting life.

Note that the surface roughness of the cutting tip of this invention is determined empirically, and the surface roughness is 1.
Since the desired excellent wear resistance can be ensured when the surface roughness is 6 μm or less, the surface roughness was determined to be 1.6 μm or less as measured by the maximum height.

〔Example〕

Next, the cutting tip of the present invention will be specifically explained using examples.

WCC cemented carbide base, WC-5%TiC-5%T
Composition consisting of aC-7% CO (more than % by weight) Onibi IS
A cutting tip having the shape of Ol50-3N 20408 (7) is prepared, and a hard layer of plasticity and average layer thickness shown in Table 1 is coated on the surface of the cutting tip using a normal chemical vapor deposition method. ~3 layers coated, then average particle size:
Charge the material into a vibrating barrel equipped with Affi203 media with a diameter of 5 mm, perform wet surface smoothing α treatment under the conditions of vibration frequency: 3 times, 7 seconds, amplitude: 5 mm, and adjust the processing time. The present invention surface wave y (1 cemented carbide cutting tip (
Samples 1 to 6 (hereinafter referred to as coated chips of the present invention) were manufactured, respectively. In addition, in the coated chips 1 to 6 of the present invention, the longer the surface smoothing treatment time, the smoother the surface (lower value of surface roughness).

In addition, for the purpose of comparison, by forming a hard layer on the surface of the above substrate so as to correspond to the composition and average layer thickness of each of the hard layers of the coated chips 1 to 6 of the present invention after the surface smoothing treatment, Conventional surface-coated cemented carbide cutting tips having the surface roughness shown in Table 1, that is, without surface smoothing treatment (hereinafter referred to as conventional coated tips) 1~
6 were produced respectively.

Next, for the coating depths 1 to 6 of the present invention and the conventional coating chips 1 to 6 obtained as a result, the work material: JIS-8
CM415 (hardness: Ha160).

Cutting speed: 250771/min.

Feed”, 3mIn/’r (3V,.

Depth of cut = 1.5M.

Cutting time: 15m1n.

Dry continuous high-speed cutting test of steel under the following conditions, and work material: Fe12 (hardness: 1-IB140).

Cutting speed: 300m/min.

Feed: 0.5mm, /reV.

Depth of cut: 1.5tnW.

In the former dry continuous high-speed cutting test of steel, the rake face wear depth and flank wear width of the cutting edge were measured. In the 5-speed cutting test, the rake face wear depth of the cutting edge was 1
50 μm or the flank wear width of the cutting edge is 0.
The cutting time up to 3 ml was measured. These measurement results are also shown in Table 1.

〔Effect of the invention〕

From the results shown in Table 1, the present invention'II cover chips 1 to 6, which have a smooth surface with a surface roughness of 1.6 μm or less in the maximum height measurement, were manufactured in accordance with these, respectively. It is clear that this chip exhibits much better wear resistance than the conventional coated chips 1 to 6, which have a surface roughness of 18 to 5μ when measured at the maximum height, and also has a relatively long service life. It is.

In the above example, the entire surface including the rake and flank faces was made smooth, but if you receive an elastic grindstone or a brush with abrasive grains attached, you can grind the rake face and the flank as necessary. 7. Even if only the flank surface is used as a smooth surface, the same excellent cutting performance can be achieved depending on the cutting conditions.

Claims (1)

[Claims] The surface of the tungsten carbide-based cemented carbide substrate is coated with a single layer or two or more of Ti carbides, nitrides, carbonitrides, carbonates, nitrides, carbonitrides, and aluminum oxides. At least one or both of the rake face and the flank face of a surface-coated cemented carbide cutting tip coated with a hard layer consisting of multiple layers has a surface roughness of 1.6 μm or less as measured by the maximum height. A surface-coated cemented carbide cutting tip characterized by having a smooth surface with .