RU61290U1 - 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 coating is proposed, comprising a tool base and a three-layer wear-resistant ion-plasma coating deposited on it, characterized in that a compound of titanium, niobium, silicon and iron is used as the lower layer; as an intermediate - niobium nitride; as the outer layer - titanium nitride or carbonitride, iron and silicon. Instead of iron, you can use chromium, molybdenum, 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 (RI).

Known cutting tool with a three-layer wear-resistant ion-plasma coating deposited by GT VNIITS and consisting of an upper layer of titanium nitride TiN, an intermediate layer of titanium carbonitride TiCN and a lower layer of titanium carbide TiC (see Vereshchak A.S. Performance of the cutting tool with wear-resistant coatings. M.: Engineering, 1993.S. 252).

The reasons that impede the achievement of the technical result indicated below when using the known coated cutting tool include the fact that in the known coated cutting tool, the applied coating has a relatively low hardness and 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 for a combination of features is a cutting tool with a multilayer coating consisting of a lower layer of a compound of titanium and a chemical element, an intermediate layer of titanium nitride or carbonitride and a chemical element, and an upper layer of nitride or carbonitride

titanium and a chemical element doped with silicon. The metal used is aluminum, iron, chromium, molybdenum or zirconium (Utility Model Patent No. 43878 IPC 7 C 23 C 14/32. Cutting tool with a multilayer coating).

The reasons that impede the achievement of the technical result indicated below when using the known coated cutting tool adopted as a prototype include the fact that in the well-known RI coated, the multilayer coating contains layers with high thermal conductivity, which leads to more heating of the tool base, as a result of which creep processes are activated, leading to loss of shape stability of the cutting wedge, its deformation and destruction of the wear-resistant coating due to the appearance and rapid development tiya cracks.

The technical result is an increase in resistance of RI.

The specified technical result in the implementation of the utility model is achieved by the fact that in the known cutting tool coated, a compound of titanium, niobium, silicon and iron is used as the lower coating layer, an intermediate layer is niobium nitride and an outer layer is titanium, iron and silicon nitride or carbonitride.

The specified technical result in the implementation of the utility model is also achieved by the fact that instead of iron, chromium, molybdenum, zirconium are used.

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 cutting tool 1, a multilayer coating is applied to its surface, consisting of a lower layer 2 containing a compound of titanium, niobium, silicon and iron; an intermediate layer 3 containing niobium nitride; top layer 4 containing titanium nitride or carbonitride, iron and silicon. Instead of iron, chromium, molybdenum, zirconium are also used in the proposed cutting tool.

The use of niobium nitride having a low thermal conductivity as an intermediate layer can improve the thermal state of the cutting tool by lowering the temperature in the cutting wedge.

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. After applying the lower coating layer was carried out

the reaction gas is nitrogen; and the intermediate layer is precipitated. Then, when a reaction gas of nitrogen (or a mixture of nitrogen and acetylene) was supplied, an upper coating layer was applied. Then, the evaporators, the supply of reaction gas, the voltage and rotation of the device were turned off. After 15-20 minutes, the chamber was opened and the coated tool was removed.

The value of the lowering of the cutting edge at the apex was measured when studying the profilograms of the contact pads on the front surface of the plates in the main secant plane on the K-202 model profilograph-profilometer.

The average temperature on the front surface of the plates under the coating was calculated according to the method of A. N. Reznikov (Reznikov A. N. Thermophysics of the processes of mechanical processing of materials / A. N. Reznikov. - M .: Mashinostroenie, 1981. - 279 p.), With experimental determination of the necessary contact characteristics on the front surface of non-turning coated plates (cutting forces, contact length of the chip with the front surface, chip shortening factor).

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 _s = 0.4 mm

Table 1 shows the test results of RI with the obtained coatings. As can be seen from the data in table 1, the resistance of the cutting tool with the developed multilayer coatings increases 1.4-1.6 times in comparison with the tool with the coating prototype.

Thus, the above information indicates

when using the claimed cutting tool with a wear-resistant coating, the following combination of conditions:

Table 1
Coated RI Test Results The thickness of the coating layers, microns The average temperature under the coating on the front surface of the plate, ° C The value of the lowering of the cutting edge at the top of the insert, microns, after operating time No pp Coating material Resistance, min Note bottom layer intermediate layer upper layer 10 min 30 minutes one 2 3 four 5 6 7 8 9 10 one TiC - TiCN - TiN 2 2 2 930 4,5 7.5 131 Analogue 2 TiZr - TiZrN -
TiZrSiN 2 2 2 946 4.2 7.0 301 Prototype 3 TiZr - TiZrCN - TiZrSiCN 2 2 2 980 4.3 7.2 326 four TiZrSiNb - NbN - TiZrSiN one four 2 989 3,7 6.4 476 5 TiZrSiNb - NbN - TiZrSiCN one four 2 915 3.9 6.5 518 6 TiFe - TiFeN - TiFeSiN 2 2 2 968 4,5 7.3 285 Prototype 7 TiFe - TiFeCN - TiFeSiCN 2 2 2 995 4,5 7.4 308 8 TiFeSiNb - NbN - TiFeSiCN one four 2 907 4.0 6.7 401 9 TiFeSiNb - NbN - TiFeSiCN one four 2 931 4.0 6.8 494

continuation of table 1 one 2 3 four 5 6 7 8 9 10 10 TiCr - TiCrN - TiCrSiN 2 2 2 964 4.4 7.3 292 Prototype eleven TiCr - TiCrCN - TiCrSiCN 2 2 2 991 4,5 7.4 324 12 TiCrSiNb - NbN - TiCrSiN one four 2 906 3.9 6.7 418 13 TiCrSiNb - NbN - TiCrSiCN one four 2 924 4.0 6.8 469 fourteen TiMo - TiMoN - TiMoSiN 2 2 2 960 4.4 7.2 286 Prototype fifteen TiMo-TiMoCN - TiMoSiCN 2 2 2 985 4.4 7.3 309 16 TiMoSiNb - NbN - TiMoSiN one four 2 904 3.8 6.5 424 17 TiMoSiNb-NbN - TiMoSiCN one four 2 921 3.9 6.6 467

the 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 to obtain wear-resistant coatings on 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 (4)

1. A cutting tool with a multilayer coating containing the tool base and a three-layer wear-resistant ion-plasma coating deposited on it, characterized in that the compound of titanium, niobium, silicon and iron is used as the lower layer; as an intermediate - niobium nitride; as the outer layer - titanium nitride or carbonitride, iron and silicon. 2. A cutting tool with a multilayer coating containing the tool base and a three-layer wear-resistant ion-plasma coating deposited on it, characterized in that the compound of titanium, niobium, silicon and chromium is used as the lower layer; as an intermediate - niobium nitride; as the outer layer, nitride or carbonitride of titanium, chromium and silicon. 3. A cutting tool with a multilayer coating containing the tool base and a three-layer wear-resistant ion-plasma coating deposited on it, characterized in that the compound of titanium, niobium, silicon and molybdenum is used as the lower layer; as an intermediate - niobium nitride; as the outer layer - nitride or carbonitride of titanium, molybdenum and silicon. 4. A cutting tool with a multilayer coating, containing the tool base and a three-layer wear-resistant ion-plasma coating deposited on it, characterized in that the compound of titanium, niobium, silicon and zirconium is used as the lower layer; as an intermediate - niobium nitride; as the outer layer - nitride or carbonitride of titanium, zirconium and silicon.