Cutter coating for processing high-hardness materials

Abstract

The utility model discloses a cutter coating for processing high-hardness materials, which comprises a cutter base body and a composite coating coated on the surface of the cutter base body, the composite coating comprises a base coat, a first transition layer, a middle layer, a second transition layer and a top layer which are sequentially arranged from inside to outside, the total thickness of the composite coating is 1.5-2.5 microns, the base coat is a TiN coating, and the top layer is a TiN coating. The bottom layer is a TiSiN coating, the middle layer is an AlTiN coating, the top layer is a TiSiN coating, the hardness of the bottom layer, the hardness of the middle layer and the hardness of the top layer are gradually increased, the first transition layer and the second transition layer are both mixed type coatings, and the thickness of the first transition layer and the thickness of the second transition layer are smaller than those of other coatings; the cutter coated with the coating has the advantages of being long in service life, stable in cutting and good in wear resistance.

Description

Technical Field

[0001] The utility model belongs to the technical field of tool coatings, and in particular relates to a tool coating for processing high-hardness materials. Background Art

[0002] In mechanical processing, common high-hardness materials to be processed include PM60 (HRC68), SKD11 (HRC62), S136 (HRC55) and H13 (HRC55). When the tool is cutting the above high-hardness materials at high speed, the cutting force is large and the cutting temperature is also high. As the hardness of the material being processed increases, the cutting temperature also increases, which further worsens the wear of the tool surface and accelerates the failure process of the tool. Faced with harsh cutting environments, tool coatings are widely used in various fields of the machinery manufacturing industry because of their excellent hardness, toughness and good high temperature resistance. Existing tool bodies have a single layer structure, low tool life, easy wear of the cutting edge, and poor cutting stability, and are not suitable for processing high-hardness materials. Therefore, it has become an urgent problem to reduce the wear of the tool surface, control the cutting stability, and improve the overall cutting quality by selecting a suitable tool coating. Utility Model Content

[0003] In view of the above problems and technical requirements, the utility model provides a tool coating for processing high-hardness materials. The tool coated with the coating has the advantages of long service life, stable cutting and good wear resistance.

[0004] The technical solution of the utility model is as follows: a tool coating for processing high-hardness materials, comprising a tool substrate and a composite coating coated on the surface of the tool substrate, the composite coating comprising a primer layer, a first transition layer, an intermediate layer, a second transition layer and a top layer arranged in sequence from the inside to the outside, the total thickness of the composite coating is 1.5-2.5μm, the primer layer is a TiN coating, the intermediate layer is an AlTiN coating, the top layer is a TiSiN coating, the hardness of the primer layer, the intermediate layer and the top layer gradually increases, the first transition layer and the second transition layer are both mixed coatings, and the thickness of the first transition layer and the second transition layer is lower than that of other coatings.

[0005] Using TiN coating as the base layer can improve the bonding strength between the tool substrate and the coating. Compared with AlTiN coating and TiSiN coating, TiN coating has a lower hardness. As a transition support layer between the tool substrate and the coating, it can significantly improve the bonding strength between the tool substrate and the coating.

[0006] The middle layer is set as AlTiN coating. AlTiN coating is widely used in processing stainless steel and other materials. Its hardness is between TiN coating and TiSiN coating. Designing it as the middle layer can make the overall coating hardness of the composite coating increase gradually and reduce the internal stress of the overall coating system. In addition, during high temperature cutting, Al can generate Al 2 O 3 , effectively preventing further wear of the coating and extending the coating life.

[0007] TiSiN is used as the top layer, because it has high hardness and good high temperature oxidation resistance, so it has significant advantages in processing high hardness materials. And due to the addition of Si element, the top layer can form Si 3 N 4 The amorphous structure wraps the TiN nanocrystalline structure, and the coating grain size is refined, making the coating have high hardness, strong toughness and good high temperature stability.

[0008] Furthermore, the first transition layer is a TiN / AlTiN mixed coating, the thickness of the first transition layer is in the range of 0.05-0.1 μm, and the hardness of the first transition layer is between the hardness of the base layer and the hardness of the intermediate layer.

[0009] Furthermore, the second transition layer is an AlTiN / TiSiN mixed coating, the thickness of the second transition layer is in the range of 0.05-0.1 μm, and the hardness of the second transition layer is between the middle layer and the top layer.

[0010] Adding a TiN / AlTiN mixed layer between the TiN layer and the AlTiN layer, and adding an AlTiN / TiSiN mixed layer between the AlTiN layer and the TiSiN layer can effectively relieve the stress between different coatings, reduce the generation of cracks, and improve the bonding strength.

[0011] Furthermore, the thickness of the primer layer is in the range of 0.1-0.3 μm.

[0012] Furthermore, the thickness of the intermediate layer is in the range of 0.8-1.2 μm.

[0013] Furthermore, the thickness of the top layer is in the range of 0.5-0.8 μm.

[0014] Furthermore, the five coatings in the composite coating are coated on the surface of the tool substrate by step-by-step bias etching. The tool substrate is metal etched by step-by-step bias etching. Compared with direct high bias, step-by-step bias etching is more stable, can effectively reduce bias overload, and is also conducive to improving bonding strength.

[0015] Compared with the prior art, the utility model has the following beneficial effects: the utility model sets five layers of coating so that the coating as a whole has multiple properties, wherein the TiN coating is used as the bottom layer, the hardness of the TiN coating is relatively low, and the bonding force between the tool substrate and the coating can be improved; the TiSiN coating is used as the top layer, and the hardness is the highest; the hardness of the middle layer AlTiN coating is between the two, and the overall hardness of the coating increases gradually from the inside to the outside, which can improve the bonding force and reduce the overall internal stress of the composite coating; adding a TiN / AlTiN mixed layer between the TiN layer and the AlTiN layer, and adding an AlTiN / TiSiN mixed layer between the AlTiN layer and the TiSiN layer can effectively relieve the stress between different coatings, reduce the generation of cracks, and improve the bonding force; the tool coated with the coating has the characteristics of stable coating, wear resistance, not easy to fall off, and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a hierarchical structure diagram of the utility model;

[0017] Marked in the figure are: tool base 1, base layer 2, first transition layer 3, middle layer 4, second transition layer 5, top layer 6. DETAILED DESCRIPTION

[0018] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0019] like Figure 1 The tool coating for processing high-hardness materials of the utility model is shown, including a tool substrate 1 and a composite coating coated on the surface of the tool substrate 1, wherein the composite coating includes a base layer 2, a first transition layer 3, an intermediate layer 4, a second transition layer 5 and a top layer 6 arranged in sequence from the inside to the outside.

[0020] The base layer 2 is a TiN coating, the first transition layer 3 is a TiN / AlTiN mixed coating, the middle layer 4 is an AlTiN coating, the second transition layer 5 is an AlTiN / TiSiN mixed coating, and the top layer 6 is a TiSiN coating.

[0021] The TiN coating is used as the bottom layer 2 to improve the bonding strength between the tool substrate 1 and the coating. Compared with the AlTiN coating and the TiSiN coating, the TiN coating has a lower hardness and, as a transition support layer between the tool substrate and the coating, can significantly improve the bonding strength between the tool substrate and the coating.

[0022] The middle layer 4 is set as AlTiN coating. AlTiN coating is widely used in processing materials such as stainless steel. Its hardness is between TiN coating and TiSiN coating. Designing it as the middle layer 4 can make the overall coating hardness of the composite coating increase gradually, reducing the internal stress of the overall coating system. In addition, during high-temperature cutting, Al can generate Al 2 O 3 , effectively preventing further wear of the coating and extending the coating life.

[0023] TiSiN is used as the top layer 6, because it has high hardness and good high temperature oxidation resistance, so it has significant advantages in processing high hardness materials. And due to the addition of Si element, the top layer can form Si 3 N 4 The amorphous structure wraps the TiN nanocrystalline structure, and the coating grain size is refined, making the coating have high hardness, strong toughness and good high temperature stability.

[0024] The first transition layer 3 and the second transition layer 4 are both mixed coatings, and the thickness of the first transition layer 3 and the second transition layer 4 is lower than that of other coatings; adding a TiN / AlTiN mixed layer between the TiN layer and the AlTiN layer, and adding an AlTiN / TiSiN mixed layer between the AlTiN layer and the TiSiN layer can effectively relieve the stress between different coatings, reduce the generation of cracks, and improve the bonding strength.

[0025] The total thickness of the composite coating is 1.5-2.5 μm, wherein the thickness of the base layer 2 is in the range of 0.1-0.3 μm, the thickness of the first transition layer 3 is in the range of 0.05-0.1 μm, the hardness of the first transition layer 3 is between the hardness of the base layer 2 and the hardness of the middle layer 4, the thickness of the middle layer 4 is in the range of 0.8-1.2 μm, the thickness of the second transition layer 5 is in the range of 0.05-0.1 μm, the hardness of the second transition layer 5 is between the hardness of the middle layer 4 and the top layer 6, and the thickness of the top layer 6 is in the range of 0.5-0.8 μm.

[0026] The hardness of the base layer 2, the first transition layer 3, the middle layer 4, the second transition layer 5 and the top layer 6 gradually increases, and the overall hardness of the coating increases gradually from the inside to the outside, which can improve the bonding force and reduce the overall internal stress of the composite coating; making the composite coating as a whole wear-resistant, not easy to fall off, and having a long service life.

[0027] The above are only several preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes and substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A tool coating for processing high-hardness materials, characterized in that: The invention comprises a tool substrate and a composite coating coated on the surface of the tool substrate, wherein the composite coating comprises a base layer, a first transition layer, an intermediate layer, a second transition layer and a top layer arranged in sequence from the inside to the outside, and the total thickness of the composite coating is 1.5-2.5 μm. The base layer is a TiN coating, the intermediate layer is an AlTiN coating, and the top layer is a TiSiN coating. The hardness of the base layer, the intermediate layer and the top layer increases gradually, the first transition layer and the second transition layer are both mixed coatings, and the thickness of the first transition layer and the second transition layer is lower than that of other coatings.

2. A tool coating for machining high-hardness materials according to claim 1, characterized in that: The first transition layer is a TiN / AlTiN mixed coating, the thickness of the first transition layer is in the range of 0.05-0.1 μm, and the hardness of the first transition layer is between the hardness of the base layer and the hardness of the intermediate layer.

3. The tool coating for machining high-hardness materials according to claim 1, characterized in that: The second transition layer is an AlTiN / TiSiN mixed coating, the thickness of the second transition layer is in the range of 0.05-0.1 μm, and the hardness of the second transition layer is between the middle layer and the top layer.

4. The tool coating for machining high-hardness materials according to claim 1, characterized in that: The thickness of the primer layer is in the range of 0.1-0.3 μm.

5. The tool coating for machining high-hardness materials according to claim 1, characterized in that: The thickness of the intermediate layer is in the range of 0.8-1.2 μm.

6. The tool coating for machining high-hardness materials according to claim 1, characterized in that: The thickness of the top layer is in the range of 0.5-0.8 μm.

7. The tool coating for machining high-hardness materials according to claim 1, characterized in that: The five coatings in the composite coating are coated on the surface of the tool substrate by using layer-by-layer step-by-step bias etching.

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