RU59063U1 - MULTI-LAYER CUTTING TOOL - Google Patents

Abstract

The utility model relates to the field of coating, in particular to coating by evaporation and condensation in a vacuum, and is intended to obtain wear-resistant coatings on a cutting tool in tool production. The technical result is an increase in the resistance of the cutting tool. A cutting tool with a multilayer wear-resistant coating is proposed, comprising a tool base and a two-layer wear-resistant ion-plasma coating deposited on it, the nitride or carbonitride of a compound of titanium, chromium and aluminum being used as the lower layer; as the upper - nitride or carbonitride compounds of titanium, chromium and zirconium.

Description

The utility model relates to the field of coating, in particular to coating by evaporation and condensation in a vacuum, and can be used in tool production to obtain wear-resistant coatings on a cutting tool.

Known cutting tool with a wear-resistant ion-plasma coating of titanium nitride TiN or titanium carbonitride TiCN, 3-8 μm thick (see Tabakov V.P. Performance of the cutting tool with wear-resistant coatings based on complex titanium nitrides and carbonitrides. Ulyanovsk: UlSTU, 1998. 123 s.).

The reasons that impede the achievement of the technical result indicated below when using a known coated cutting tool include the fact that in the known coated cutting tool, the applied coating has relatively low hardness, level of compressive stresses and insufficient adhesion to the tool base. As a result of this, the coating undergoes more wear and tear, cracks quickly nucleate and propagate in it, leading to the destruction of the coating, which reduces the resistance of the coated cutting tool.

The closest cutting tool with a coating of the same purpose to the claimed utility model according to the totality of features is a cutting tool with a multilayer coating containing the tool base and a multilayer ion-plasma wear-resistant coating deposited on it, consisting

from the upper layer of the nitride compound of titanium, silicon and zirconium TiSiZrN and the lower layer of the nitride compound of titanium and silicon TiSiN (see Decision 6, patent application for utility model No. 2005134098/22 (038130)) adopted as a prototype.

The reasons that impede the achievement of the technical result indicated below when using a known cutting tool with a coating adopted as a prototype include the fact that in a known cutting tool with a coating, the multilayer coating contains a lower layer having low adhesion to the tool base, and the coating has insufficient hardness . As a result, the coating poorly resists the processes of wear and tear and quickly collapses when cutting. Therefore, the coating should consist of an upper layer with maximum hardness and a lower layer with maximum hardness with maximum adhesion to the tool base.

The technical result is an increase in the resistance of the cutting tool.

The specified technical result in the implementation of the utility model is achieved by the fact that in the known cutting tool with a coating, the nitride or carbonitride of a compound of titanium, chromium and aluminum is used as the lower coating layer; as the upper - nitride or carbonitride compounds of titanium, chromium and zirconium.

The analysis of the prior art by the applicant, including a search by patent and scientific and technical sources of information and identification of sources containing information about analogues of the claimed utility model, allowed to establish that the applicant did not find a source characterized by features identical to all the essential features of the claimed utility model,

defined from the list of identified analogues of the prototype, as the closest in the totality of the features of the analogue, it was possible to establish a set of significant distinctive features in relation to the applicant's perceived technical result in the claimed cutting tool with a wear-resistant coating set forth in the claims.

Therefore, the claimed utility model meets the condition of "novelty."

Information confirming the possibility of implementing a utility model with obtaining the above technical result.

The essence of the utility model is as follows. In the proposed carbide cutting tool 1, a multilayer coating is applied to the surface, consisting of a lower layer 2 containing a nitride or carbonitride of a titanium, chromium and aluminum compound and an upper layer 3 containing a nitride or carbonitride of a titanium, chromium and zirconium compound.

The coatings were applied by the CIB method (condensation from the plasma phase in vacuum with ion bombardment). Non-grind plates preliminarily cleaned of contaminants made of MK8 hard alloy were placed in the chamber of the Bulat-6T installation with electric arc evaporators installed in it, the cathode materials of which include coating elements. The nitride-based coating was carried out in a nitrogen medium, and the carbon nitride-based coating was carried out in a mixture of nitrogen and acetylene.

The microhardness of the coatings was determined on a PMT-3 microhardness tester.

The adhesion strength of the coating to the tool material was evaluated by pressing a diamond indenter on a TK-2M hardness tester with a load of 600 N. For the criterion for evaluating the adhesion

the strength properties of the composition “coating - tool material” adopted a peeling coefficient, defined as the ratio of the peeling area of the coating to the indenter imprint area.

Durable tests of the cutting tool were carried out with the longitudinal turning of billets made of 30KhGSA steel on a 16K20 lathe. Cutting modes: cutting speed V = 180 m / min, feed S = 0.15 mm / rev, cutting depth t = 0.5 mm, processing was performed without the use of coolant. For the wear criterion, the value of the chamfer of wear on the rear surface was taken: h ₃ = 0.4 mm.

Table 1 shows the test results of cutting tools with the obtained coatings.

Table 1
Coated Cutting Tool Test Results No pp Coating material The thickness of the coating layers, microns Peeling ratio Microhardness, GPa Resistance, min Note 1 layer 2 layer one 2 3 four 5 6 7 8 one TiN 5 - 1.16 29.2 45 Analogue 2 TiSiN-TiSiZrN 2,5 2,5 1.48 37.6 144 Prototype 3 TiCrAIN-TiCrZrN 2,5 2,5 1.18 39.9 185 - four TiCrAICN-TiCrZrCN 2,5 2,5 1.35 44.8 207 -

As can be seen from the data in table 1, the resistance of plates with multilayer coatings increases 1.28-1.44 times in comparison with a tool with a coating prototype.

Thus, the above information indicates the fulfillment of the following set of conditions when using the declared cutting tool with a wear-resistant coating:

- a tool embodying the claimed cutting tool with a wear-resistant coating in its implementation, is intended for use in industry, namely in the field of coating, in particular in the field of coating by evaporation and condensation in a vacuum, and can be used in tool production for wear-resistant coatings on a cutting tool;

- for the declared cutting tool with a wear-resistant coating in the form described in the independent clause of the stated utility model formula, the possibility of its implementation using the means and methods described in the application or known prior to the priority date is confirmed;

- a tool that embodies the claimed utility model in its implementation, is able to ensure the achievement of the perceived by the applicant technical result.

Therefore, the claimed utility model meets the condition of "industrial applicability".

Claims (1)

A cutting tool with a multilayer wear-resistant coating, containing a tool base and a two-layer wear-resistant ion-plasma coating deposited on it, the nitride or carbonitride of a compound of titanium, chromium and aluminum being used as the lower layer; as the upper - nitride or carbonitride compounds of titanium, chromium and zirconium.