RU89111U1 - MULTI-LAYER CUTTING TOOL - Google Patents

Abstract

A cutting tool with a multilayer wear-resistant coating, containing the tool base and a three-layer wear-resistant ion-plasma coating deposited on it, the titanium and molybdenum compounds nitride or carbonitride are used as the lower layer at their ratio, wt.%: Titanium 95.75-97.0 molybdenum 3.0-4.25; as an intermediate, nitride or carbonitride of a compound of titanium, molybdenum and silicon at their ratio, wt.%: titanium 96.15-97.35, molybdenum 2.0-3.0, silicon 0.65-0.85; as the upper one, nitride or carbonitride of a compound of titanium, molybdenum and silicon at their ratio, wt.%: titanium 93.65-95.35, molybdenum 4.0-5.5, silicon 0.65-0.85.

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 (RI) 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 a 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 RI with the coating.

The closest cutting tool with a coating of the same purpose to the claimed utility model according to a combination of features is a cutting tool with a multilayer coating containing a tool base and a multilayer ion-plasma wear-resistant coating, consisting of a lower layer of titanium and titanium molybdenum compound TiMoN and an upper layer nitride compounds of titanium, molybdenum and silicon TiMoSiN (Patent for utility model RU 59615 U1), adopted as a prototype.

For reasons that impede the achievement of the technical result indicated below when using a known coated cutting tool adopted as a prototype, the multilayer coating in the known RI coated has insufficient hardness and, therefore, crack resistance. As a result, the coating poorly resists the processes of wear and tear and quickly collapses when cutting.

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 titanium and molybdenum compound nitride or carbonitride are used as the lower coating layer in the ratio, wt.%: Titanium 95.75-97.0, molybdenum 3, 0-4.25; as an intermediate, nitride or carbonitride of a compound of titanium, molybdenum and silicon at their ratio, wt.%: titanium 96.15-97.35, molybdenum 2.0-3.0, silicon 0.65-0.85; as the upper one, nitride or carbonitride of a compound of titanium, molybdenum and silicon at their ratio, wt.%: titanium 93.65-95.35, molybdenum 4.0-5.5, silicon 0.65-0.85.

An 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, determined from the list of identified analogues of the prototype, as the closest in the totality of the characteristics of the analogue, allowed to establish a set of essential in relation to perceived by the applicant to the technical result of the distinguishing features in the claimed cutting tool with a wear-resistant coating, set out in the formula of the utility model.

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 nitride or carbonitride of a titanium and molybdenum compound at a ratio of wt.%: Titanium 95.75-97.0, molybdenum 3.0- 4.25; the intermediate layer 3 containing a nitride or carbonitride of a compound of titanium, molybdenum and silicon at their ratio, wt.%: titanium 96.15-97.35, molybdenum 2.0-3.0, silicon 0.65-0.85; the upper layer 4 containing nitride or carbonitride of a compound of titanium, molybdenum and silicon at their ratio, wt.%: titanium 93.65-95.35, molybdenum 4.0-5.5, silicon 0.65-0.85 ..

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 cathodes installed in it, the materials of which include coating elements. The nitride-based coating was carried out in a nitrogen medium, and the carbonitride-based coating was carried out in a mixture of nitrogen and acetylene.

The coating thickness was 6 μm. The thickness of each layer of the three-layer coating was 2 μm.

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

Durable tests of the cutting tool were carried out with the longitudinal turning of blanks 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 criterion of wear was taken the value of the chamfer of wear on the rear surface: h ₃ = 0.4 mm

Table 1 shows the test results of RI with the obtained coatings.

Table 1 Coated RI Test Results Coating material The chemical composition of the coating layers (ratio of metal components),% wt. Microhardness, GPa Resistance, min Note 1 layer 2 layer 3 layer Ti Mo Ti Si Mo Ti Si Mo TiN - 29.2 45 Analogue TiMoN-TiMoSiN 96.37 3.63 - 94.5 0.75 4.75 39.0 142 Prototype TiMoN-TiMoSiN-TiMoSiN 97 3 97.25 0.75 2 95.25 0.75 four 39.7 183 96.37 3.63 96.85 0.65 2.5 94.6 0.65 4.75 40,4 195 96.37 3.63 96.75 0.75 2.5 94.5 0.75 4.75 40.8 201 96.37 3.63 96.65 0.85 2.5 94.4 0.85 4.75 40.3 194 95.75 4.25 96.25 0.75 3 93.75 0.75 5.5 39.6 186 TiMoCN-TiMoSiCN-TiMoSiCN 97 3 97.25 0.75 2 95.25 0.75 four 46.0 216 96.37 3.63 96.85 0.65 2.5 94.6 0.65 4.75 46.5 224 96.37 3.63 96.75 0.75 2.5 94.5 0.75 4.75 46.8 229 96.37 3.63 96.65 0.85 2.5 94.4 0.85 4.75 46.3 225 95.75 4.25 96.25 0.75 3 93.75 0.75 5.5 45.7 218

As can be seen from the data in table 1, the resistance of the plates with the proposed multilayer coatings increases by 1.3-1.6 times compared with the tool with the 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 the tool base and a three-layer wear-resistant ion-plasma coating deposited on it, the titanium and molybdenum compounds nitride or carbonitride are used as the lower layer at their ratio, wt.%: Titanium 95.75-97.0 molybdenum 3.0-4.25; as an intermediate, a nitride or carbonitride of a compound of titanium, molybdenum and silicon at their ratio, wt.%: titanium 96.15-97.35, molybdenum 2.0-3.0, silicon 0.65-0.85; as the upper one, nitride or carbonitride of a compound of titanium, molybdenum and silicon at their ratio, wt.%: titanium 93.65-95.35, molybdenum 4.0-5.5, silicon 0.65-0.85.