Edge trim die coating and method of making same

Abstract

The present application relates to the technical field of material, and discloses a trimming die coating and a preparation method thereof, which comprises a substrate and at least one coating, and the coating comprises a first sub-coating W, a second sub-coating HT-TiCN, a third sub-coating Al2O3, a TiN coating, a TiC coating and a TiCO coating, one side of the TiC coating is deposited on one side of the first sub-coating W, one side of the second sub-coating HT-TiCN is deposited on one side of the TiN coating, one side of the TiC coating is deposited on one side of the second sub-coating HT-TiCN, one side of the TiCO coating is deposited on one side of the TiC coating, and one side of the third sub-coating Al2O3 is deposited on one side of the TiCO coating. The present application forms a coherent / semi-coherent growth between the substrate and the coating interface by preferentially depositing the first sub-coating W on the surface of the substrate. On the other hand, the coating with increased hardness gradient is deposited on the surface of the first sub-coating W to reduce residual stress. The combination of the two aspects can significantly improve the bonding strength between the trimming die substrate and the coating, thereby prolonging the service life of the tool.

Description

Technical Field

[0001] This invention relates to the field of materials technology, specifically to a cutting die coating and its preparation method. Background Technology

[0002] Hexagonal cutting dies are an important tool in the production of standard bolts. Their performance and lifespan directly affect product quality and production costs, while coatings can significantly improve the service life of cutting dies and product quality.

[0003] Common cutting dies include M2 ​​die steel (W6Mo5Cr4V2) and high-speed steel. Directly depositing hard coatings (such as TiN, TiCN, Al2O3, etc.) on die steel and high-speed steel substrates usually results in poor adhesion. This is because the hardness difference between the hard coating and the substrate is large, and the composition of the substrate and coating materials is also very different, making it difficult to form coherent growth at the substrate-coating interface. Therefore, a cutting die coating and its preparation method are proposed. Summary of the Invention

[0004] The purpose of this invention is to provide a cutting die coating and its preparation method, in order to solve the problem mentioned in the background art that common cutting dies include M2 ​​die steel (W6Mo5Cr4V2), high-speed steel, etc., where the adhesion of hard coatings (such as TiN, TiCN, Al2O3, etc.) deposited directly on the die steel and high-speed steel substrate is usually poor. This is because the hardness difference between the hard coating and the substrate is large, and the composition element difference between the substrate and the coating material is large, making it difficult to form coherent growth at the interface between the substrate and the coating.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a cutting die coating, comprising a substrate and a coating having at least one layer;

[0006] The coating comprises a first sub-coating W, a second sub-coating HT-TiCN, a third sub-coating Al2O3, a TiN coating, a TiC coating, and a TiCO coating. One side of the TiC coating is deposited on one side of the first sub-coating W, one side of the second sub-coating HT-TiCN is deposited on one side of the TiN coating, one side of the TiC coating is deposited on one side of the second sub-coating HT-TiCN, one side of the TiCO coating is deposited on one side of the TiC coating, and one side of the third sub-coating Al2O3 is deposited on one side of the TiCO coating.

[0007] Preferably, one side of the first sub-coating W is deposited on one side of the substrate, and at least one side of the coating is deposited on one side of the substrate.

[0008] Preferably, the C / N atomic ratio of the second sub-coating HT-TiCN gradually increases from 0.25 to 4.0, and the material of the second sub-coating HT-TiCN is high-temperature titanium nitride.

[0009] Preferably, the hardness of the first sub-coating W, the second sub-coating HT-TiCN, and the third sub-coating Al2O3 increases sequentially.

[0010] Preferably, the third sub-coating Al2O3 has a face-centered cubic (κ) phase structure.

[0011] Preferably, the total thickness of the coating is 8 to 18 micrometers, and more preferably 10 to 12 micrometers.

[0012] Preferably, the thickness of the first sub-coating W is 0.5 to 2 micrometers, the thickness of the TiN coating is 1 to 2 micrometers, the thickness of the second sub-coating HT-TiCN is 3 to 6 micrometers, the thickness of the TiC coating is 1 to 2 micrometers, the thickness of the TiCO coating is 0.5 to 1 micrometer, and the thickness of the third sub-coating Al2O3 is 2 to 5 micrometers.

[0013] Preferably, the matrix is ​​hot work die steel or high speed steel.

[0014] The present invention also provides a method for preparing a coating for a cutting edge die, comprising the following steps:

[0015] S1. Preparation of the first sub-coating W. The first sub-coating W can be prepared by physical vapor deposition magnetron sputtering or chemical vapor deposition.

[0016] Physical vapor deposition magnetron sputtering method: deposition temperature 400-600℃, deposition pressure 0.01-0.1mbar, target material is pure W target, target power 5-10kW, and Ar is introduced into the furnace cavity during deposition;

[0017] Chemical vapor deposition method: the deposition temperature is 900-1050℃, the deposition pressure is 50-100mbar, and the reaction gases include WCl6 and H2;

[0018] S2 and TiN coatings were prepared by chemical vapor deposition, with a deposition temperature of 900-1000℃, a deposition pressure of 50-200mbar, and reactant gases including TiCl4, N4 and H2.

[0019] S3, the second sub-coating HT-TiCN was prepared by chemical vapor deposition, wherein the deposition temperature was 900-1050℃, the deposition pressure was 50-200mbar, and the reaction gases included TiCl4, N2, CH4 and H2;

[0020] S4 and TiC coatings were prepared by chemical vapor deposition, with a deposition temperature of 900-1050℃, a deposition pressure of 50-200mbar, and reaction gases including TiCl4, CH4 and H2.

[0021] S5 and TiCO coatings were prepared by chemical vapor deposition, with a deposition temperature of 900-1050℃, a deposition pressure of 50-200mbar, and reactant gases including TiCl4, CO, CH4, and H2.

[0022] S6, the third sub-coating Al2O3 was prepared by chemical vapor deposition, wherein the deposition temperature was 900-1050℃, the deposition pressure was 50-100mbar, and the reaction gases included AlCl3, CO2, H2S and H2.

[0023] Compared with the prior art, the present invention has the following technical effects: By preferentially depositing the first sub-coating W on the substrate surface, the present invention enables the substrate and coating interface to form a coherent / semi-coherent growth. On the other hand, by depositing a coating with an increased hardness gradient on the surface of the first sub-coating W, residual stress is reduced. The combination of these two aspects can significantly improve the bonding strength between the cutting die substrate and the coating, thereby extending the tool's service life. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a cross-sectional structural diagram of the present invention. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "first", "second", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" or "several" means two or more, unless otherwise explicitly specified.

[0029] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0030] Example 1

[0031] In the existing technology, common cutting dies include M2 ​​die steel (W6Mo5Cr4V2) and high-speed steel. Directly depositing hard coatings (such as TiN, TiCN, Al2O3, etc.) on die steel and high-speed steel substrates usually results in poor adhesion. This is because the hardness difference between the hard coating and the substrate is large, and the composition elements of the substrate and coating materials are very different, making it difficult to form coherent growth at the interface between the substrate and the coating.

[0032] Please see Figure 1 The present invention provides a technical solution:

[0033] The substrate material is selected as M2 mold steel, and multiple layers of coating are sequentially deposited on the substrate surface. The preparation method is as follows:

[0034] S1, the first sub-coating W, was prepared by chemical vapor deposition with deposition parameters of 1000℃, deposition pressure of 70mbar, reaction gases including WCl6 and H2, and coating thickness of 1.0 micrometer.

[0035] The S2 and TiN layers were prepared by chemical vapor deposition at a deposition temperature of 950℃ and a deposition pressure of 100mbar. The reaction gases included TiCl4, N4 and H2, and the coating thickness was 1.5 micrometers.

[0036] S3, the second sub-coating HT-TiCN, was prepared by chemical vapor deposition at a deposition temperature of 1000℃ and a deposition pressure of 100mbar. The reaction gases included TiCl4, N2, CH4 and H2. The C / N atomic ratio of the HT-TiCN coating gradually increased from 0.25 to 4.0, and the coating thickness was 4.5 micrometers.

[0037] The S4 and TiC layers were prepared by chemical vapor deposition at a deposition temperature of 1000℃ and a deposition pressure of 150mbar. The reaction gases included TiCl4, CH4 and H2, and the coating thickness was 1.5 micrometers.

[0038] The S5 and TiCO layers were prepared by chemical vapor deposition at a deposition temperature of 1000℃ and a deposition pressure of 150mbar. The reaction gases included TiCl4, CO, CH4 and H2, and the coating thickness was 1.0 micrometer.

[0039] S6, the third sub-coating Al2O3, was prepared by chemical vapor deposition at a deposition temperature of 1020℃ and a deposition pressure of 80mbar. The reaction gases included AlCl3, CO2, H2S and H2. Al2O3 has a face-centered cubic κ phase structure and a coating thickness of 4.0 micrometers.

[0040] Example 2

[0041] The difference between this embodiment and Embodiment 1 is that:

[0042] The substrate material is selected as M2 mold steel, and multiple layers of coating are sequentially deposited on the substrate surface. The preparation method is as follows:

[0043] S1, the first sub-coating W, was prepared by physical vapor deposition at a deposition temperature of 500℃ and a deposition pressure of 0.05mbar. The target material was a pure W target with a target power of 8kW. Ar was introduced into the furnace chamber during deposition, and the coating thickness was 1.0 micrometers.

[0044] The S2 and TiN layers were prepared by chemical vapor deposition at a deposition temperature of 950℃ and a deposition pressure of 100mbar. The reaction gases included TiCl4, N4 and H2, and the coating thickness was 1.5 micrometers.

[0045] S3, the second sub-coating HT-TiCN, was prepared by chemical vapor deposition at a deposition temperature of 1000℃ and a deposition pressure of 100mbar. The reaction gases included TiCl4, N2, CH4 and H2. The C / N atomic ratio of the HT-TiCN coating gradually increased from 0.25 to 4.0, and the coating thickness was 4.5 micrometers.

[0046] The S4 and TiC layers were prepared by chemical vapor deposition at a deposition temperature of 1000℃ and a deposition pressure of 150mbar. The reaction gases included TiCl4, CH4 and H2, and the coating thickness was 1.5 micrometers.

[0047] The S5 and TiCO layers were prepared by chemical vapor deposition at a deposition temperature of 1000℃ and a deposition pressure of 150mbar. The reaction gases included TiCl4, CO, CH4 and H2, and the coating thickness was 1.0 micrometer.

[0048] S6, the third sub-coating Al2O3, was prepared by chemical vapor deposition at a deposition temperature of 1020℃ and a deposition pressure of 80mbar. The reaction gases included AlCl3, CO2, H2S and H2. Al2O3 has a face-centered cubic κ phase structure and a coating thickness of 4.0 micrometers.

[0049] Comparative Example 1

[0050] The substrate material is selected as M2 mold steel, and multiple layers of coating are sequentially deposited on the substrate surface. The preparation method is as follows:

[0051] S1, the first sub-coating W, was prepared by chemical vapor deposition with deposition parameters of 1000℃, deposition pressure of 70mbar, reaction gases including WCl6 and H2, and coating thickness of 1.0 micrometer.

[0052] The S2 and TiN layers were prepared by chemical vapor deposition at a deposition temperature of 950℃ and a deposition pressure of 100mbar. The reaction gases included TiCl4, N4 and H2, and the coating thickness was 1.5 micrometers.

[0053] S3, the second sub-coating HT-TiCN, was prepared by chemical vapor deposition at a deposition temperature of 1000℃ and a deposition pressure of 100mbar. The reaction gases included TiCl4, N2, CH4 and H2. The C / N atomic ratio of the HT-TiCN coating was 0.5 and the coating thickness was 4.5 micrometers.

[0054] The S4 and TiC layers were prepared by chemical vapor deposition at a deposition temperature of 1000℃ and a deposition pressure of 150mbar. The reaction gases included TiCl4, CH4 and H2, and the coating thickness was 1.5 micrometers.

[0055] The S5 and TiCO layers were prepared by chemical vapor deposition at a deposition temperature of 1000℃ and a deposition pressure of 150mbar. The reaction gases included TiCl4, CO, CH4 and H2, and the coating thickness was 1.0 micrometer.

[0056] S6, the third sub-coating Al2O3, was prepared by chemical vapor deposition at a deposition temperature of 1020℃ and a deposition pressure of 80mbar. The reaction gases included AlCl3, CO2, H2S and H2. Al2O3 has a face-centered cubic κ phase structure and a coating thickness of 4.0 micrometers.

[0057] Comparative Example 2

[0058] The difference between this comparative example and Comparative Example 1 is that:

[0059] The substrate material is selected as M2 mold steel, and multiple layers of coating are sequentially deposited on the substrate surface. The preparation method is as follows:

[0060] The S1 and TiN layers were prepared by chemical vapor deposition at a deposition temperature of 950℃ and a deposition pressure of 100mbar. The reaction gases included TiCl4, N4 and H2, and the coating thickness was 1.5 micrometers.

[0061] S2, the second sub-coating HT-TiCN, was prepared by chemical vapor deposition at a deposition temperature of 1000℃ and a deposition pressure of 100mbar. The reaction gases included TiCl4, N2, CH4 and H2. The C / N atomic ratio of the HT-TiCN coating gradually increased from 0.25 to 4.0, and the coating thickness was 4.5 micrometers.

[0062] The S3 and TiC layers were prepared by chemical vapor deposition at a deposition temperature of 1000℃ and a deposition pressure of 150mbar. The reaction gases included TiCl4, CH4 and H2, and the coating thickness was 1.5 micrometers.

[0063] The S4 and TiCO layers were prepared by chemical vapor deposition at a deposition temperature of 1000℃ and a deposition pressure of 150mbar. The reaction gases included TiCl4, CO, CH4 and H2, and the coating thickness was 1.0 micrometer.

[0064] S5, the third sub-coating Al2O3, was prepared by chemical vapor deposition at a deposition temperature of 1020℃ and a deposition pressure of 80mbar. The reaction gases included AlCl3, CO2, H2S and H2. Al2O3 has a face-centered cubic κ phase structure and a coating thickness of 4.0 micrometers.

[0065] Comparative Example 3

[0066] This comparative example differs from Comparative Examples 1 and 2 in that:

[0067] The substrate material is selected as M2 mold steel, and multiple layers of coating are sequentially deposited on the substrate surface. The preparation method is as follows:

[0068] S1, the first sub-coating W, was prepared by chemical vapor deposition with deposition parameters of 1000℃, deposition pressure of 70mbar, reaction gases including WCl6 and H2, and coating thickness of 1.0 micrometer.

[0069] The S2 and TiN layers were prepared by chemical vapor deposition at a deposition temperature of 950℃ and a deposition pressure of 100mbar. The reaction gases included TiCl4, N4 and H2, and the coating thickness was 1.5 micrometers.

[0070] S3, the second sub-coating HT-TiCN, was prepared by chemical vapor deposition at a deposition temperature of 1000℃ and a deposition pressure of 100mbar. The reaction gases included TiCl4, N2, CH4 and H2. The C / N atomic ratio of the HT-TiCN coating was 0.5 and the coating thickness was 4.5 micrometers.

[0071] The S4 and TiC layers were prepared by chemical vapor deposition at a deposition temperature of 1000℃ and a deposition pressure of 150mbar. The reaction gases included TiCl4, CH4 and H2, and the coating thickness was 1.5 micrometers.

[0072] The S5 and TiCO layers were prepared by chemical vapor deposition at a deposition temperature of 1000℃ and a deposition pressure of 150mbar. The reaction gases included TiCl4, CO, CH4 and H2, and the coating thickness was 1.0 micrometer.

[0073] S6, the third sub-coating Al2O3, was prepared by chemical vapor deposition at a deposition temperature of 1020℃ and a deposition pressure of 80mbar. The reaction gases included AlCl3, CO2, H2S and H2. Al2O3 has a close-packed hexagonal α-phase structure and a coating thickness of 4.0 micrometers.

[0074] The comparative data of membrane-substrate bonding strength for Examples 1, 2, 1, 2, and 3 are as follows:

[0075] sample Membrane-substrate bonding strength (N) Example 1 105 Example 2 100 Comparative Example 1 90 Comparative Example 2 82 Comparative Example 3 95

[0076] The following is a comparison of the service life of Examples 1 and 2 with Comparative Examples 1, 2, and 3 when applied to the processing of 304 stainless steel bolts:

[0077] sample Average lifespan (in ten thousand cycles) Example 1 1.1 Example 2 0.95 Comparative Example 1 0.81 Comparative Example 2 0.65 Comparative Example 3 0.75

[0078] In summary, this invention achieves coherent / semi-coherent growth at the substrate-coating interface by preferentially depositing a first sub-coating W on the substrate surface, and by depositing a coating with an increased hardness gradient on the surface of the first sub-coating W to reduce residual stress. The combination of these two aspects can significantly improve the bonding strength between the cutting die substrate and the coating, thereby extending the tool's service life.

[0079] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. It should be noted that implementations not illustrated or described in the drawings or the main text of the specification are forms known to those skilled in the art and are not described in detail. Furthermore, the definitions of the components described above are not limited to the various specific structures, shapes, or methods mentioned in the embodiments, and those skilled in the art can easily modify or substitute them.

[0080] It should also be noted that, in specific embodiments of the present invention, unless otherwise stated otherwise, the numerical parameters in this specification and the appended claims are approximate values ​​and can be changed according to the desired characteristics obtained from the content of the present invention. Specifically, all numbers used in the specification and claims to indicate dimensions, range conditions, etc., of the composition should be understood to be modified by the term "about" in all cases. Generally, this means that there may be variations of ±10% in some embodiments, ±5% in some embodiments, ±1% in some embodiments, and ±0.5% in some embodiments.

[0081] Those skilled in the art will understand that the features described in the various embodiments and / or claims of the present invention can be combined or combined in various ways, even if such combinations or combinations are not explicitly described in the present invention. In particular, the features described in the various embodiments and / or claims of the present invention can be combined or combined in various ways without departing from the spirit and teachings of the present invention. All such combinations and / or combinations fall within the scope of the present invention.

[0082] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A coating for edge trimming, characterized in that: Includes a substrate and a coating layer of at least one layer; The coating comprises a first sub-coating W, a TiN coating, a second sub-coating HT-TiCN, a TiC coating, a TiCO coating, and a third sub-coating κ-Al2O3, sequentially deposited on the outer surface of the substrate.

2. The edge-cutting die coating according to claim 1, characterized in that: The C / N atomic ratio of the second sub-coating HT-TiCN gradually increases from 0.25 to 4.0, and the material of the second sub-coating HT-TiCN is high-temperature titanium nitride.

3. The edge-cutting die coating according to claim 1, characterized in that: The hardness of the first sub-coating W, the second sub-coating HT-TiCN, and the third sub-coating κ-Al2O3 increases sequentially.

4. The edge-cutting die coating according to claim 1, characterized in that: The total thickness of the coating is 8 to 18 micrometers.

5. The edge-cutting die coating according to claim 1, characterized in that: The total thickness of the coating is 10 to 12 micrometers.

6. The edge-cutting die coating according to claim 4, characterized in that: The thickness of the first sub-coating W is 0.5–2 micrometers, the thickness of the TiN coating is 1–2 micrometers, the thickness of the second sub-coating HT-TiCN is 3–6 micrometers, the thickness of the TiC coating is 1–2 micrometers, the thickness of the TiCO coating is 0.5–1 micrometer, and the thickness of the third sub-coating κ-Al2O3 is 2–5 micrometers.

7. The edge-cutting die coating according to claim 1, characterized in that: The matrix is ​​hot work die steel or high-speed steel.

8. The method for preparing the coating of the cutting die according to any one of claims 1-7, characterized in that, Includes the following steps: S1. Preparation of the first sub-coating W. The first sub-coating W is prepared by physical vapor deposition magnetron sputtering or chemical vapor deposition. Physical vapor deposition magnetron sputtering method: deposition temperature 400-600℃, deposition pressure 0.01-0.1mbar, target material is pure W target, target power 5-10kW, and Ar is introduced into the furnace cavity during deposition; Chemical vapor deposition method: the deposition temperature is 900-1050℃, the deposition pressure is 50-100mbar, and the reaction gases include WCl6 and H2; S2 and TiN coatings were prepared by chemical vapor deposition, with a deposition temperature of 900-1000℃, a deposition pressure of 50-200mbar, and reactant gases including TiCl4, N2 and H2. S3, the second sub-coating HT-TiCN was prepared by chemical vapor deposition, wherein the deposition temperature was 900-1050℃, the deposition pressure was 50-200mbar, and the reaction gases included TiCl4, N2, CH4 and H2; The S4 and TiC coatings were prepared by chemical vapor deposition, with a deposition temperature of 900–1050℃, a deposition pressure of 50–200 mbar, and reactant gases including TiCl4, CH4, and H2. The S5 and TiCO coatings were prepared by chemical vapor deposition, with a deposition temperature of 900–1050℃ and a deposition pressure of 50–200 mbar. The reactant gases included TiCl4, CO, CH4, and H2. S6, the third sub-coating κ-Al2O3 was prepared by chemical vapor deposition, wherein the deposition temperature was 900-1050℃, the deposition pressure was 50-100mbar, and the reaction gases included AlCl3, CO2, H2S and H2.

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