CN114045458B - Coating method applied to tool steel material cutter for aluminum alloy machining - Google Patents
Coating method applied to tool steel material cutter for aluminum alloy machining Download PDFInfo
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- CN114045458B CN114045458B CN202210034913.XA CN202210034913A CN114045458B CN 114045458 B CN114045458 B CN 114045458B CN 202210034913 A CN202210034913 A CN 202210034913A CN 114045458 B CN114045458 B CN 114045458B
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/36—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases using ionised gases, e.g. ionitriding
- C23C8/38—Treatment of ferrous surfaces
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
- C23C14/0605—Carbon
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
- C23C14/0641—Nitrides
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
- C23C14/14—Metallic material, boron or silicon
- C23C14/16—Metallic material, boron or silicon on metallic substrates or on substrates of boron or silicon
- C23C14/165—Metallic material, boron or silicon on metallic substrates or on substrates of boron or silicon by cathodic sputtering
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
- C23C14/24—Vacuum evaporation
- C23C14/32—Vacuum evaporation by explosion; by evaporation and subsequent ionisation of the vapours, e.g. ion-plating
- C23C14/325—Electric arc evaporation
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
- C23C14/34—Sputtering
- C23C14/35—Sputtering by application of a magnetic field, e.g. magnetron sputtering
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/02—Pretreatment of the material to be coated
Abstract
The invention discloses a coating method applied to an aluminum alloy cutter made of tool steel, which is used for coating a diamond-like carbon film on the aluminum alloy surface of the tool steel and comprises the steps of cleaning the aluminum alloy cutter made of the tool steel and subjected to grinding and coating pretreatment; loading into a coating furnace, vacuumizing, heating, and plasma etching; performing ion nitriding treatment on the surface of the tool; depositing a high-bias CrN layer, a CrN transition layer and a metal Cr layer on the ion nitriding layer; cooling in vacuum; depositing a diamond-like carbon film on the surface of the aluminum alloy of the tool steel. The invention can improve the surface hardness of the tool steel material, strengthen the film-substrate combination effect, and finally realize the improvement of the wear resistance and the improvement of the service life of the tool steel device.
Description
Technical Field
The invention belongs to the field of tool surface treatment, and particularly relates to a coating method applied to a tool made of tool steel for machining an aluminum alloy.
Background
In machining, the aluminum alloy material has the advantages of low hardness, small plasticity and high heat conductivity, but the melting point is low, the plasticity is increased when the temperature is increased in the machining process, the friction resistance between cutting friction surfaces at high temperature and high pressure is increased, and the phenomenon of tool sticking is easy to occur, so that the tool is rapidly failed. In the current aluminum alloy processing field, an anti-bonding layer is formed on the surface of a tool, so that the problem of knife adhesion can be effectively solved, for example, a diamond-like carbon film is coated.
In the processing of aluminum alloy cutters, two materials are mainly involved, namely hard alloy and tool steel. The hard alloy has higher cost, the material of the tool steel has low cost, and the cost performance is outstanding in the specific field. The tool steel is generally divided into carbon tool steel, alloy tool steel and high-speed tool steel, the hardness of the tool steel is mostly between 600 and 800HV, the hardness of the hard alloy is generally more than 1500HV, and the wear resistance of the tool steel is inferior to that of the hard alloy; meanwhile, the hardness difference also causes the coating bonding force to be obviously different on tools made of two materials, for example, the diamond-like coating can reach more than 80N on hard alloy, and only about 20N on tool steel. Therefore, the wear resistance of the aluminum alloy tool made of the tool steel and the bonding strength of the coating on the aluminum alloy tool made of the tool steel are improved, a great improvement effect is achieved on the service life of the aluminum alloy tool made of the tool steel, and the cost performance advantage is further highlighted.
Disclosure of Invention
In order to solve the technical problems, the invention provides a coating method applied to an aluminum alloy cutter made of tool steel, which can improve the surface hardness of the tool steel material and finally realize the improvement of the wear resistance and the service life of a tool steel aluminum alloy appliance.
In order to realize the technical effects, the technical scheme of the invention is as follows: a coating method applied to a tool made of tool steel for aluminum alloy processing, which is used for coating a diamond-like carbon film on the surface of the tool made of tool steel for aluminum alloy processing, and comprises the following steps:
1) carrying out ultrasonic cleaning, surface oil stain removal and drying on a tool for processing aluminum alloy made of tool steel and subjected to grinding and coating pretreatment;
2) loading into a coating furnace, vacuumizing, heating, and performing plasma etching;
3) performing ion nitriding treatment on the surface of the tool steel cutter for aluminum alloy machining by using an ion source in argon, nitrogen and hydrogen atmospheres;
depositing and sputtering a high-bias CrN layer on the surface of the cutter for processing the aluminum alloy made of the tool steel through ion nitriding, wherein the bias is 500-600V, the N content is 40-60%, and the thickness is 0.1-0.2 mu m;
depositing and sputtering a CrN gradient transition layer on the surface of the CrN layer, and carrying out bias voltage of 50-200V, wherein the content of N is changed from high to low in a gradient manner until the content of N is 0 and the thickness of the transition layer is 0.1-0.5 mu m;
then depositing a sputtering metal Cr layer with the thickness of 0.1-0.2 mu m on the surface of the transition layer;
4) reducing the temperature of the tool steel aluminum alloy processing cutter to be within 300 ℃ in a vacuum state;
5) and depositing a diamond-like carbon film on the surface of the tool for processing the aluminum alloy made of the tool steel by using an arc graphite target.
Wherein, the process temperature of the step 2) coating furnace and the step 3) ion nitriding is not higher than the heat treatment tempering temperature of the tool steel material.
The plasma etching in the step 2) and the ion nitriding in the step 3) adopt the same ion source, and the plasma etching is firstly carried out and then the ion nitriding is carried out.
Wherein, the flow rates of the argon, the nitrogen and the hydrogen in the step 3) are in a ratio of 1:1:3, and the total pressure of the reaction is not more than 5e-2 mBar.
Wherein, the depth of the ion nitriding layer obtained after the ion nitriding treatment in the step 3) is 40-80 μm.
Wherein the surface hardness of the ion nitriding layer is more than or equal to 1000 HV.
Wherein, the CrN layer, the CrN transition layer and the metal Cr layer in the step 3) are prepared by adopting a non-equilibrium closed field magnetron sputtering process.
Wherein, the diamond-like film is deposited in the step 5) by adopting an arc ion plating process, the thickness of the film is 0.1-1.0 μm, and the nano-hardness is more than or equal to 4500 HV. Preferably, the diamond-like film has a thickness of 0.3 to 1.0 μm.
In addition, the hardness of the tool steel material after heat treatment needs to reach above 700HV or meet the design requirement, and the heat treatment of the tool steel material adopts high-temperature tempering. This is a requirement for the tool steel material itself to be used as a tool.
The coating pretreatment comprises processes of deburring, polishing and the like. The pretreatment of the coating can not lead the passivation value of the cutting edge to exceed the design requirement of aluminum alloy processing. This is a requirement for pre-treatment of the coating.
The coating equipment used in the invention needs to have the functions of magnetron sputtering and arc ion plating at the same time.
According to the invention, the surface of the tool steel aluminum alloy cutter subjected to high-temperature tempering heat treatment is subjected to high-temperature ion nitriding, and a hard layer-ion nitriding layer with the thickness of tens of micrometers is formed on the working surface, so that the wear resistance of the base material and the supporting effect on the coating can be obviously improved, and the integral service life of the cutter is further prolonged.
The surface hardness of the ion nitriding layer reaches over 1000HV, and a high-strength bottom supporting effect is provided for the coating; a high-bias CrN layer and a CrN transition layer are added on the surface of the ion nitriding layer, and hardness and chemical gradient transition are set, so that the interface separation between the ion nitriding layer and the Cr layer caused by factors such as oxidation, cutting fluid, moisture and the like in the use process of the cutter is prevented. The scratch bonding strength value of the diamond-like coating and the tool steel substrate is increased from 10-30N to more than 40N. The service life of the tool is improved by more than 0.5 times compared with the non-ion nitriding effect, and the cost performance advantage of the tool made of steel is further improved. Meanwhile, the process flow of the invention is obviously different from the conventional ion nitriding and atmosphere nitriding, the ion nitriding and the coating are completed in the same process procedure, the repeated loading and unloading and the pollution in the operation process are avoided, and the operation is simpler and quicker; in addition, the phenomenon that atmosphere nitriding easily generates a white layer to cause unstable coating bonding effect is eliminated.
The technical problems solved by the invention include:
1. the hardness of the tool steel material is low, the surface hardness of the basic material can be improved, and simultaneously, the wear-resisting effect of the cutter can be improved along with the improvement of the hardness of the tool steel substrate;
2. the diamond-like carbon film coating has lower bonding strength on the tool steel, and the bonding strength of the coating is improved because the supporting layer is strengthened after the surface hardness of the tool steel material is improved;
3. the high-bias CrN layer and the CrN transition layer are added on the surface of the ion nitriding layer, hardness and chemical gradient transition are set, so that the interface separation between the ion nitriding layer and the Cr layer caused by factors such as oxidation, cutting fluid, moisture and the like in the use process of the cutter is prevented (under the working condition of the cutter, the chemical stability of CrN and the interface stability of the ion nitriding layer are far greater than those of the Cr layer), and the interface is strengthened.
The invention finally realizes the improvement of the wear resistance and the service life of the aluminum alloy cutter of the tool steel; and compared with the traditional treatment process, the method has the characteristics of simplicity, high efficiency and stability.
The surface of the tool steel aluminum alloy cutter subjected to high-temperature tempering heat treatment is subjected to high-temperature ion nitriding, and a hard layer with the thickness of dozens of micrometers is formed on a working surface; still deposit in addition have CrN layer, CrN transition layer and Cr layer, increase high bias voltage CrN layer and CrN transition layer on the ion nitrided layer surface, set up hardness and chemical gradient transition, prevent that the cutter from receiving the interface separation between oxidation, cutting fluid, moisture etc. factor leads to ion nitrided layer and the Cr layer in the use, can show the support effect of the wearability that increases substrate itself to the coating, and then promote the whole life of cutter.
Drawings
FIG. 1 is a schematic structural view of a coating of the present invention, wherein 1-a matrix material; 2-an ionic nitrided layer; 3-high bias CrN layer; 4-CrN transition layer; 5-Cr bottom layer; 6-arc diamond-like carbon layer.
FIG. 2 is a microscopic view of a hardfacing layer deposited by the present invention.
Detailed Description
The technical solution of the present invention will be further described with reference to the following specific examples, but the present invention is not limited to these examples.
Example 1
Polishing and removing burrs on the cutting edge of the SKD61 material aluminum subjected to quenching and full tempering heat treatment by using a single-edge milling cutter; cleaning oil stain on the surface of the milling cutter by using an industrial ultrasonic cleaning line, drying, loading into a coating fixture, loading into a coating furnace, vacuumizing to 5e-5mbar, and heating to 450 ℃. The mill surface was etched with an ion source and argon gas for 60 min. Keeping the ion source in a working state, continuously introducing argon, and increasing the flow of mixed gas of introduced nitrogen and hydrogen, wherein the flow of argon, nitrogen and hydrogen is 1:1:3, the total air pressure in the coating furnace is kept at 2e-2mbar, and the bias voltage is set to be 100V, so that the ion nitridation is carried out. The ion nitriding time is 120min, the depth of a nitriding layer is 45 mu m (micrometer), and the surface hardness is 1050 HV. The furnace temperature was allowed to cool naturally to 260 ℃ under vacuum. Depositing and sputtering a high-bias CrN layer on the surface of the nitrided milling cutter, wherein the bias is 600V, the N content is 50-55%, and the thickness is 0.2 mu m; then depositing and sputtering a CrN gradient transition layer on the surface of the CrN layer, biasing to 50V, and changing the N content from high to low in a gradient manner until the N content is 0 and the thickness of the transition layer is 0.2 mu m; then depositing a sputtering metal Cr layer with the thickness of 0.2 mu m on the surface of the transition layer; starting an arc graphite target, setting the current of the graphite target at 120A, bias voltage power supply at 150V, argon gas pressure at 1e-2mbar, and depositing a diamond-like carbon film with the thickness of 0.5 mu m. The hardness of the arc diamond film on the same material furnace test piece is 5500 +/-500 HV, and the scratch bonding force is 40.5N, while the scratch bonding force of the test piece which is not treated by the ion nitriding process is only 18.3N. Compared with cutting tests, the coated milling cutter which is not treated by the ion nitriding process can be used for processing 80pcs aluminum alloy workpieces, the milling cutter coated by the process can still keep good surface quality when being processed to 80pcs, the final service life can reach 110 plus 120pcs, and the process has a remarkable improvement effect.
Example 2
Performing wet sand blasting treatment on the surface of an M2D 3.0 high-speed steel drill bit which is subjected to overheating treatment and has the hardness of 62HRC to remove burrs; ultrasonic cleaning, oven drying, loading into coating furnace, vacuum pumping to 8e-5mbar, and heating to 500 deg.C. The drill face was etched with an ion source and argon gas for 30 min. Keeping the ion source in a working state, continuously introducing argon, and increasing the flow of mixed gas of introduced nitrogen and hydrogen, wherein the flow of argon, nitrogen and hydrogen is 1:1:3, the total air pressure in the coating furnace is kept at 2e-2mbar, and the bias voltage is set to be 100V, so that the ion nitridation is carried out. The ion nitriding time is 90min, the depth of a nitriding layer is 40 mu m, and the surface hardness can reach 1180 HV; the furnace temperature was allowed to cool naturally to 150 ℃ under vacuum. Depositing and sputtering a high-bias CrN layer on the surface of the nitrided drill bit, wherein the bias is 580V, the N content is 45-50%, and the thickness is 0.2 mu m; depositing and sputtering a CrN gradient transition layer on the surface of the CrN layer, and biasing for 200V, wherein the N content is changed from high to low in a gradient manner until the N content is 0 and the thickness of the transition layer is 0.5 mu m; then depositing a sputtering metal Cr layer with the thickness of 0.1-0.2 mu m on the surface of the transition layer; and starting the electric arc graphite target, setting the current of the graphite target at 120A, the bias power supply at 150V, the argon gas pressure at 1e-2mbar, and depositing the diamond-like carbon film with the thickness of 1.0 mu m.
The hardness of the arc diamond film on the same material furnace test piece is 5500 +/-500 HV, and the scratch bonding force is 49.0N, while the scratch bonding force of the test piece which is not treated by the ion nitriding process is only 21.2N. Compared with an aluminum alloy drilling test, serious burrs and sticky scraps occur when a coating drill bit without being treated by an ionic nitriding process is used for processing about 500 holes; the drill bit coated according to the process can process 1000-1200 holes, and the service life is prolonged by more than 1 time.
FIG. 1 is a schematic structural diagram of the coating of the present invention, which shows that an ion nitrided layer, a high bias CrN layer, a CrN transition layer, a Cr primer layer, and an arc diamond-like carbon layer are sequentially prepared on the surface of a tool steel material by deposition according to the preparation method of the present invention.
FIG. 2 shows the microscopic degree of the surface hardening layer obtained by deposition, and the effective depth of the nitriding layer can reach 70 μm, thus the microscopic degree of the surface hardening layer of the base material can be obviously improved by adopting the technical scheme of the invention.
The surface of a tool steel aluminum alloy cutter which is subjected to high-temperature tempering heat treatment is subjected to high-temperature ion nitriding firstly, and a hard ion nitriding layer with the thickness of dozens of micrometers is formed on a working surface; still deposit in addition have CrN layer, CrN transition layer and Cr layer, increase high bias voltage CrN layer and CrN transition layer on the ion nitrided layer surface, set up hardness and chemical gradient transition, prevent that the cutter from receiving the interface separation between oxidation, cutting fluid, moisture etc. factor leads to ion nitrided layer and the Cr layer in the use, can show the support effect of the wearability that increases substrate itself to the coating, and then promote the whole life of cutter.
The above-described embodiments are only preferred embodiments of the present invention, and it should be noted that those skilled in the art can make various changes and modifications without departing from the inventive concept of the present invention, which falls into the protection scope of the present invention.
Claims (8)
1. A coating method applied to a tool for processing tool steel aluminum alloy, which is characterized in that the coating method is used for coating a diamond-like carbon film on the surface of the tool for processing tool steel aluminum alloy, and the coating method comprises the following steps:
1) carrying out ultrasonic cleaning, surface oil stain removal and drying on the tool for processing the tool steel aluminum alloy after grinding and coating pretreatment;
2) loading into a coating furnace, vacuumizing, heating, and performing plasma etching;
3) performing ion nitriding treatment on the surface of the tool for processing the tool steel aluminum alloy by using an ion source in argon, nitrogen and hydrogen atmospheres;
depositing and sputtering a high-bias CrN layer on the surface of the nitrided aluminum alloy cutter, wherein the bias is 500-600V, the N content is 40-60%, and the thickness is 0.1-0.2 mu m;
depositing and sputtering a CrN gradient transition layer on the surface of the CrN layer, and carrying out bias voltage of 50-200V, wherein the content of N is changed from high to low in a gradient manner until the content of N is 0 and the thickness of the transition layer is 0.1-0.5 mu m;
then depositing a sputtering metal Cr layer with the thickness of 0.1-0.2 mu m on the surface of the transition layer;
4) reducing the temperature of the tool steel-aluminum alloy cutter to be within 300 ℃ in a vacuum state;
5) and depositing a diamond-like carbon film on the surface of the tool steel aluminum alloy cutter by using an electric arc graphite target.
2. The method for coating a tool used for machining an aluminum alloy made of a tool steel according to claim 1, wherein the process temperature of the step 2) coating furnace and the step 3) ion nitriding is not higher than the heat treatment tempering temperature of the tool steel.
3. The coating method for a tool for machining an aluminum alloy of tool steel according to claim 1, wherein the depth of the nitrided layer obtained after the ion nitriding treatment in step 3) is 40 to 80 μm.
4. The method of claim 1, wherein the plasma etching in step 2) and the ion nitriding in step 3) are performed using the same ion source, and the plasma etching is performed before the ion nitriding.
5. The method for coating a tool for machining a steel-based aluminum alloy as claimed in claim 1, wherein the flow rates of argon, nitrogen and hydrogen in step 3) are in a ratio of 1:1:3, and the total pressure of the reaction is not more than 5e-2 mBar.
6. The coating method for a tool for machining an aluminum alloy made of a tool steel according to claim 1, wherein the surface hardness of said ion-nitrided layer is 1000HV or more.
7. The method for coating a tool used for machining a tool steel-based aluminum alloy according to claim 1, wherein the CrN layer, the CrN transition layer and the metal Cr layer in the step 3) are prepared by a non-equilibrium closed field magnetron sputtering process.
8. The method for coating a tool used for processing the tool steel aluminum alloy according to claim 1, wherein the diamond-like carbon film is deposited in the step 5) by an arc ion plating process, and the diamond-like carbon film is deposited to have a thickness of 0.1-1.0 μm and a nano hardness of 4500HV or more.
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| CN103160796A (en) * | 2011-12-16 | 2013-06-19 | 中国科学院兰州化学物理研究所 | Method of preparing diamond-like thin film on surface of steel |
| WO2017047795A1 (en) * | 2015-09-17 | 2017-03-23 | 新日鐵住金株式会社 | Titanium pipe-forming roll, titanium pipe-forming apparatus, and titanium pipe-manufacturing method |
| CN106521493A (en) * | 2016-10-27 | 2017-03-22 | 广州今泰科技股份有限公司 | Diamond-like carbon film of gradient structure and preparation method thereof |
| JP2018159126A (en) * | 2017-03-22 | 2018-10-11 | 新日鐵住金株式会社 | Titanium tube molding roll, titanium tube molding apparatus and method for manufacturing titanium tube |
| CN107858684A (en) * | 2017-12-25 | 2018-03-30 | 深圳先进技术研究院 | Metal diamond-like composite coating and preparation method thereof and purposes and coated tool |
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