CN110863182A - Method for strengthening surface coating of gear cold extrusion die - Google Patents
Method for strengthening surface coating of gear cold extrusion die Download PDFInfo
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- CN110863182A CN110863182A CN201911101427.XA CN201911101427A CN110863182A CN 110863182 A CN110863182 A CN 110863182A CN 201911101427 A CN201911101427 A CN 201911101427A CN 110863182 A CN110863182 A CN 110863182A
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- 238000000641 cold extrusion Methods 0.000 title claims abstract description 90
- 239000011248 coating agent Substances 0.000 title claims abstract description 87
- 238000000576 coating method Methods 0.000 title claims abstract description 87
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000005728 strengthening Methods 0.000 title claims abstract description 23
- 238000000151 deposition Methods 0.000 claims abstract description 29
- 238000004140 cleaning Methods 0.000 claims abstract description 17
- 238000010791 quenching Methods 0.000 claims abstract description 15
- 230000000171 quenching effect Effects 0.000 claims abstract description 15
- 238000005496 tempering Methods 0.000 claims abstract description 15
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 14
- 239000010959 steel Substances 0.000 claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 claims abstract description 12
- 239000002184 metal Substances 0.000 claims abstract description 12
- 229910052751 metal Inorganic materials 0.000 claims abstract description 12
- 238000001771 vacuum deposition Methods 0.000 claims abstract description 12
- 238000001755 magnetron sputter deposition Methods 0.000 claims abstract description 10
- 238000001035 drying Methods 0.000 claims abstract description 6
- 238000005498 polishing Methods 0.000 claims abstract description 6
- 238000005482 strain hardening Methods 0.000 claims abstract description 3
- 230000008021 deposition Effects 0.000 claims description 6
- 238000006386 neutralization reaction Methods 0.000 claims description 2
- 239000011159 matrix material Substances 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 6
- 239000000956 alloy Substances 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 238000005256 carbonitriding Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 238000004544 sputter deposition Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 238000005255 carburizing Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 239000012459 cleaning agent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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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
- C23C14/352—Sputtering by application of a magnetic field, e.g. magnetron sputtering using more than one target
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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
- C23C14/0021—Reactive sputtering or evaporation
- C23C14/0036—Reactive 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
- C23C14/02—Pretreatment of the material to be coated
- C23C14/021—Cleaning or etching treatments
- C23C14/022—Cleaning or etching treatments by means of bombardment with energetic particles or radiation
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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
- C23C14/02—Pretreatment of the material to be coated
- C23C14/024—Deposition of sublayers, e.g. to promote adhesion of the coating
- C23C14/025—Metallic sublayers
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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
- C23C14/02—Pretreatment of the material to be coated
- C23C14/028—Physical treatment to alter the texture of the substrate surface, e.g. grinding, polishing
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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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- Physical Vapour Deposition (AREA)
Abstract
The invention discloses a method for strengthening a surface coating of a gear cold extrusion die, which comprises the following steps: 1) adopting cold-working die steel to manufacture a gear cold extrusion die, and then quenching and tempering the gear cold extrusion die; 2) polishing the surface, cleaning and drying; 3) the gear cold extrusion die is arranged in a vacuum coating chamber of a magnetron sputtering device, two Cr targets and two Al targets are respectively arranged at four magnetron targets of the magnetron sputtering device, and the same metal target is arranged in an aligned mode; 4) carrying out ion cleaning on the gear cold extrusion die; 5) depositing a Cr coating on the surface of the gear cold extrusion die; 6) depositing a CrN coating on the Cr coating; 7) and depositing a CrAlN coating on the CrN coating. The strengthening method deposits a layer of superhard film with wear resistance and antifriction performance on the surface of the die, greatly reduces the friction coefficient on the premise of not influencing the performance of the matrix of the die, and prolongs the service life of the die by more than two times.
Description
Technical Field
The invention belongs to the technical field of surface strengthening of steel and iron material cold extrusion dies, and particularly relates to a method for strengthening a surface coating of a gear cold extrusion die.
Background
The continuous development of the cold extrusion precision forming technology changes the manufacturing mode of the traditional gear and greatly saves the manufacturing cost. As a key core technology of the cold extrusion technology, the service life of a die directly determines the manufacturing cost of the cold extrusion gear. The technical scheme that present gear cold extrusion mould adopted has two kinds: firstly, adopting a die steel material, and performing surface nitriding or carbonitriding treatment after quenching and tempering treatment to improve the wear resistance; and the other is to adopt a proper hard alloy material as a mould.
For the cold extrusion forming die of the gear made of the low-carbon carburizing steel, the surface of the cold extrusion forming die bears larger deformation stress and abrasion, and simultaneously has high temperature generated by deformation and friction. In the practical production, M35 material with higher alloy content is used as a cold extrusion die of the gear. Firstly, the mould is subjected to a preliminary heat treatment of quenching and tempering, and then surface carbonitriding is carried out to improve the surface wear resistance. However, in practical use, it is found that the dies have failure modes such as surface galling and adhesive wear after twenty-few gears are subjected to cold extrusion, and the carbonitriding firstly does not change the properties of the materials, so that the parts are close to the dies in material, and adhesion is easy to occur. Meanwhile, the part is deformed greatly in the cold extrusion process, and the organic coating originally coated on the surface of the part and used as a lubricating layer is not available on the local surface, so that the friction is increased, the heat productivity is increased, the local adhesion abrasion is more easily caused, and finally the service life of the die is seriously reduced. In addition, although the hard alloy is adopted as the die and has higher wear resistance, the hard alloy die is very difficult to process and assemble, so that the die cost is high, and the final part cost is also high.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides a method for strengthening the surface coating of the gear cold extrusion die.
In order to achieve the purpose, the invention adopts the technical scheme that: a method for strengthening the surface coating of a gear cold extrusion die comprises the following steps:
1) adopting cold-working die steel to manufacture a gear cold extrusion die, and then quenching and tempering the gear cold extrusion die;
2) polishing the surface of the gear cold extrusion die treated in the step 1), cleaning and drying;
3) placing the gear cold extrusion mold treated in the step 2) into a vacuum coating chamber of a magnetron sputtering device, respectively installing two Cr targets and two Al targets at four magnetron targets of the magnetron sputtering device, and installing the same metal target in an aligned mode;
4) vacuumizing the vacuum coating chamber to 10 DEG-3Introducing Ar gas below Pa, and carrying out ion cleaning on the gear cold extrusion die;
5) continuously introducing high-purity Ar gas, opening the two Cr targets, and depositing a Cr coating on the surface of the gear cold extrusion die;
6) closing Ar gas source, and introducing N2Continuously opening the two Cr targets, and depositing a CrN coating on the Cr coating;
7) continuously introducing N2Simultaneously opening the two Al targets, and depositing a CrAlN coating on the CrN coating;
8) turning off the four target power supplies and continuing to switch in N2And taking out the gear cold extrusion die after the air pressure in the vacuum coating chamber is balanced with the atmospheric pressure and is reduced to the room temperature.
In the above technical scheme, in the step 1), the cold-work die steel is M35 steel; the quenching and tempering treatment of the gear cold extrusion die specifically comprises the following steps: the quenching temperature is 1150-1220 ℃, the medium is oil, the tempering temperature is 450-650 ℃, and the time is 2-5 hours.
In the above technical scheme, in the step 3), the purities of the Cr target and the Al target are both more than 99.9%.
In the technical scheme, in the step 4), the air pressure in the vacuum coating chamber is controlled to be 0.5-1 Pa, the temperature of the gear cold extrusion die is maintained at 180-260 ℃, and the ion cleaning time is 15-30 minutes.
In the technical scheme, in the step 5), the bias voltage of the gear cold extrusion die is controlled to be-150V-160V, the target current is controlled to be 4-6A, and the deposition time of the Cr coating is 30-50 minutes.
In the technical scheme, in the step 6), the bias voltage of the gear cold extrusion die is controlled to be-120 to-140V, the target current is controlled to be 10 to 15A, and the deposition time for depositing the CrN coating is 40 to 50 minutes.
In the technical scheme, in the step 7), the target current is controlled to be 5-7A, and the deposition time for depositing the CrAlN coating is 3-6 hours.
In the technical scheme, in the step 5), the thickness of the deposited Cr coating is 1-2 microns; in the step 6), the thickness of the deposited CrN coating is 1-2 microns; in the step 7), the thickness of the deposited CrAlN coating is 2-8 microns.
In the above technical scheme, Cr in the craaln coating: atomic ratio of Al Cr: al > 1: 1; the hardness of the CrAlN coating should be greater than 2200 HV.
In the technical scheme, the total thickness of the Cr coating, the CrN coating and the CrAlN coating is 4-12 microns.
In the technical scheme, in the step 4) and the step 5), the flow rate of the introduced Ar gas is controlled to be 70-90L/min; the step 6) of neutralization and the step 7) of introducing N2The flow rate of (2) is controlled to be 70-90L/min.
Compared with the prior art, the invention has the beneficial effects that:
firstly, the strengthening method of the invention firstly cleans and activates the surface of the die, then uses the common cleaning agent to remove the pollutants such as oil stain and the like on the surface of the die, and then uses the magnetron sputtering method to deposit a layer of superhard film with wear resistance and antifriction performance on the surface of the die, thereby greatly reducing the friction coefficient on the premise of not influencing the performance of the matrix of the die, and simultaneously, because the hardness of the surface of the die is improved, the service life of the die is prolonged by more than two times, the production efficiency is improved, and the production cost is reduced.
Secondly, the strengthening method forms a layer of superhard film with the hardness of 2200-; meanwhile, CrAlN belongs to a ceramic material, has great difference with the material structure of cold extrusion carburizing steel, does not generate cold welding and adhesion phenomena, and prolongs the service life of the die.
Thirdly, the CrAlN coating on the surface of the die has higher surface smoothness, and can reduce the friction coefficient in the cold extrusion process, thereby better ensuring the surface quality of parts.
Drawings
FIG. 1 is a schematic cross-sectional view of a surface coating of a cold extrusion die for a gear according to the present embodiment;
in the figure: 1-gear cold extrusion die, 2-Cr coating, 3-CrN coating and 4-CrAlN coating.
Detailed Description
The invention will be further described in detail with reference to the following drawings and specific examples, which are not intended to limit the invention, but are for clear understanding.
Example 1
The method for strengthening the surface coating of the gear cold extrusion die in the embodiment takes the planetary gear cold extrusion die as an example, and specifically comprises the following steps:
1) the method comprises the following steps of (1) manufacturing a gear cold extrusion die 1 by using M35 steel, and then quenching and tempering the gear cold extrusion die, wherein the quenching temperature is 1190 ℃, the medium is oil, and the tempering temperature is 580 ℃ for 3 hours;
2) cleaning the gear cold extrusion die 1 by surface polishing, oil removal, dirt removal and the like, and drying after cleaning;
3) two metal Cr targets with the purity of more than 99.9 percent and two metal Al targets with the same purity are respectively arranged at four magnetic control target positions of a magnetic control sputtering device, and the same metal is arranged in a contraposition way; then, the cleaned gear cold extrusion die 1 is arranged in a vacuum coating chamber of the magnetron sputtering equipment;
4) vacuum pumping is carried out to 10-3Introducing high-purity Ar gas below Pa, controlling the flow at 80L/min, controlling the air pressure at 0.7Pa, ensuring the temperature of the die to be 260 ℃, and carrying out ion cleaning on the gear cold extrusion die 1 for 15 minutes;
5) continuously introducing a high-purity Ar gas source, controlling the flow at 80L/min, simultaneously reducing the bias voltage of the gear cold extrusion die to-150V, opening two Cr targets, controlling the target current to be 4A, depositing a Cr coating 2 on the surface of the gear cold extrusion die for 50 minutes, wherein the thickness of the deposited Cr coating is 1-2 microns;
6) closing Ar gas source, and introducing high-purity N2Controlling the flow at 80L/min, continuously opening the two Cr targets, controlling the bias voltage of a workpiece to be 130V, controlling the target current to be 12A, depositing a CrN coating 3 on the Cr coating 2 for 40 minutes, wherein the thickness of the deposited CrN coating is 1-2 microns;
7) continuously introducing high-purity N2Controlling the flow at 80L/min, simultaneously opening two Al targets, controlling the current at 5A, depositing a CrAlN coating 4 on the CrN coating 3 for 4 hours, wherein the thickness of the deposited CrAlN coating is 4-5 microns;
8) turning off four target power supplies and continuously introducing high-purity N2And taking out the mold after the air pressure of the vacuum chamber is balanced with the atmospheric pressure and the temperature is reduced to the room temperature.
The planetary gear cold extrusion die manufactured by the invention has no damage after hundreds of uses in the cold extrusion process test process, and the hardness of the CrAlN coating is more than 2200HV through the test.
Example 2
The method for strengthening the surface coating of the gear cold extrusion die in the embodiment takes the planetary gear cold extrusion die as an example, and specifically comprises the following steps:
1) manufacturing a gear cold extrusion die 1 by using M35 steel, and then quenching and tempering the gear cold extrusion die, wherein the quenching temperature is 1150 ℃, the medium is oil, the tempering temperature is 650 ℃, and the time is 5 hours;
2) cleaning the gear cold extrusion die 1 by surface polishing, oil removal, dirt removal and the like, and drying after cleaning;
3) two metal Cr targets with the purity of more than 99.9 percent and two metal Al targets with the same purity are respectively arranged at four magnetic control target positions of a magnetic control sputtering device, and the same metal is arranged in a contraposition way; then, the cleaned gear cold extrusion die 1 is arranged in a vacuum coating chamber of the magnetron sputtering equipment;
4) vacuum pumping is carried out to 10-3Introducing high-purity Ar gas below Pa, controlling the flow at 70L/min, controlling the air pressure at 0.5Pa, ensuring the temperature of the die to be 180 ℃, and carrying out ion cleaning on the gear cold extrusion die 1 for 30 minutes;
5) continuously introducing high-purity Ar gas, controlling the flow at 70L/min, simultaneously reducing the bias voltage of the gear cold extrusion die to-160V, opening two Cr targets, controlling the target current to be 6A, depositing a Cr coating 2 on the surface of the gear cold extrusion die for 30 minutes, wherein the thickness of the deposited Cr coating is 1-2 microns;
6) closing Ar gas source, and introducing high-purity N2Controlling the flow at 70L/min, continuously opening the two Cr targets, controlling the bias voltage of a workpiece to 120V, controlling the target current to 10A, depositing a CrN coating 3 on the Cr coating 2 for 50 minutes, wherein the thickness of the deposited CrN coating is 1-2 microns;
7) continuously introducing high-purity N2Controlling the flow at 70L/min, simultaneously opening two Al targets, controlling the current at 7A, depositing a CrAlN coating 4 on the CrN coating 3 for 3 hours, wherein the thickness of the deposited CrAlN coating is 2-3 microns;
8) turning off four target power supplies and continuously introducing high-purity N2And taking out the mold after the air pressure of the vacuum chamber is balanced with the atmospheric pressure and the temperature is reduced to the room temperature.
The planetary gear cold extrusion die manufactured by the invention has no damage after hundreds of uses in the cold extrusion process test process, and the hardness of the CrAlN coating is more than 2200HV through the test.
Example 3
The method for strengthening the surface coating of the gear cold extrusion die in the embodiment takes the planetary gear cold extrusion die as an example, and specifically comprises the following steps:
1) the method comprises the following steps of (1) manufacturing a gear cold extrusion die 1 by using M35 steel, and then quenching and tempering the gear cold extrusion die, wherein the quenching temperature is 1220 ℃, the medium is oil, the tempering temperature is 450 ℃, and the time is 2 hours;
2) cleaning the gear cold extrusion die 1 by surface polishing, oil removal, dirt removal and the like, and drying after cleaning;
3) two metal Cr targets with the purity of more than 99.9 percent and two metal Al targets with the same purity are respectively arranged at four magnetic control target positions of a magnetic control sputtering device, and the same metal is arranged in a contraposition way; then, the cleaned gear cold extrusion die 1 is arranged in a vacuum coating chamber of the magnetron sputtering equipment;
4) vacuum pumping is carried out to 10-3Introducing high-purity Ar gas below Pa, controlling the flow at 70L/min, controlling the air pressure at 1Pa, ensuring the mold temperature at 260 ℃, and carrying out ion cleaning on the gear cold extrusion mold 1 for 20 minutes;
5) continuously introducing high-purity Ar gas, controlling the flow at 90L/min, simultaneously reducing the bias voltage of the gear cold extrusion die to-155V, opening the two Cr targets, controlling the target current to be 5A, depositing a Cr coating 2 on the surface of the gear cold extrusion die for 40 minutes, wherein the thickness of the deposited Cr coating is 1-2 microns;
6) closing Ar gas source, and introducing high-purity N2Controlling the flow at 90L/min, continuously opening the two Cr targets, controlling the bias voltage of a workpiece to be 140V, controlling the target current to be 15A, depositing a CrN coating 3 on the Cr coating 2 for 45 minutes, wherein the thickness of the deposited CrN coating is 1-2 microns;
7) continuously introducing high-purity N2Controlling the flow at 90L/min, simultaneously opening two Al targets, controlling the current at 6A, depositing a CrAlN coating 4 on the CrN coating 3 for 6 hours, wherein the thickness of the deposited CrAlN coating is 7-8 microns;
8) turning off four target power supplies and continuously introducing high-purity N2And taking out the mold after the air pressure of the vacuum chamber is balanced with the atmospheric pressure and the temperature is reduced to the room temperature.
The planetary gear cold extrusion die manufactured by the invention has no damage after hundreds of uses in the cold extrusion process test process, and the hardness of the CrAlN coating is more than 2200HV through the test.
The above description is only for the specific embodiments of the present invention, and it should be noted that the remaining detailed descriptions are related to the prior art, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the protection scope of the present invention.
Claims (10)
1. A method for strengthening a surface coating of a gear cold extrusion die is characterized by comprising the following steps:
1) adopting cold-working die steel to manufacture a gear cold extrusion die, and then quenching and tempering the gear cold extrusion die;
2) polishing the surface of the gear cold extrusion die treated in the step 1), cleaning and drying;
3) placing the gear cold extrusion mold treated in the step 2) into a vacuum coating chamber of a magnetron sputtering device, respectively installing two Cr targets and two Al targets at four magnetron targets of the magnetron sputtering device, and installing the same metal target in an aligned mode;
4) vacuumizing the vacuum coating chamber to 10 DEG-3Introducing Ar gas below Pa, and carrying out ion cleaning on the gear cold extrusion die;
5) continuously introducing Ar gas, opening the two Cr targets, and depositing a Cr coating on the surface of the gear cold extrusion die;
6) closing Ar gas source, and introducing N2Continuously opening the two Cr targets, and depositing a CrN coating on the Cr coating;
7) continuously introducing N2Simultaneously opening the two Al targets, and depositing a CrAlN coating on the CrN coating;
8) turning off the four target power supplies and continuing to switch in N2And taking out the gear cold extrusion die after the air pressure in the vacuum coating chamber is balanced with the atmospheric pressure and is reduced to the room temperature.
2. The method for strengthening the surface coating of the gear cold extrusion die according to claim 1, characterized in that: in the step 1), the cold-work die steel is M35 steel; the quenching and tempering treatment of the gear cold extrusion die specifically comprises the following steps: the quenching temperature is 1150-1220 ℃, the medium is oil, the tempering temperature is 450-650 ℃, and the time is 2-5 hours.
3. The method for strengthening the surface coating of the gear cold extrusion die according to claim 1, characterized in that: in the step 3), the purity of the Cr target and the purity of the Al target are both more than 99.9%.
4. The method for strengthening the surface coating of the gear cold extrusion die according to claim 1, characterized in that: in the step 4), the air pressure in the vacuum coating chamber is controlled to be 0.5-1 Pa, the temperature of the gear cold extrusion die is maintained to be 180-260 ℃, and the ion cleaning time is 15-30 minutes.
5. The method for strengthening the surface coating of the gear cold extrusion die according to claim 1, characterized in that: in the step 5), the bias voltage of the gear cold extrusion die is controlled to be-150V-160V, the target current is controlled to be 4-6A, and the deposition time of depositing the Cr coating is 30-50 minutes.
6. The method for strengthening the surface coating of the gear cold extrusion die according to claim 1, characterized in that: in the step 6), the bias voltage of the gear cold extrusion die is controlled to be-120V to-140V, the target current is controlled to be 10A to 15A, and the deposition time for depositing the CrN coating is 40 minutes to 50 minutes.
7. The method for strengthening the surface coating of the gear cold extrusion die according to claim 1, characterized in that: in the step 7), the target current is controlled to be 5-7A, and the deposition time for depositing the CrAlN coating is 3-6 hours.
8. The method for strengthening the surface coating of the gear cold extrusion die according to claim 1, characterized in that: in the step 5), the thickness of the deposited Cr coating is 1-2 microns; in the step 6), the thickness of the deposited CrN coating is 1-2 microns; in the step 7), the thickness of the deposited CrAlN coating is 2-8 microns.
9. The method for strengthening the surface coating of the gear cold extrusion die according to claim 8, characterized in that: the total thickness of the Cr coating, the CrN coating and the CrAlN coating is 4-12 microns.
10. The method for strengthening the surface coating of the gear cold extrusion die according to claim 1, characterized in that: in the step 4) and the step 5), the flow rate of the introduced Ar gas is controlled to be 70-90L/min; the step 6) of neutralization and the step 7) of introducing N2The flow rate of (2) is controlled to be 70-90L/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911101427.XA CN110863182A (en) | 2019-11-12 | 2019-11-12 | Method for strengthening surface coating of gear cold extrusion die |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911101427.XA CN110863182A (en) | 2019-11-12 | 2019-11-12 | Method for strengthening surface coating of gear cold extrusion die |
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| Publication Number | Publication Date |
|---|---|
| CN110863182A true CN110863182A (en) | 2020-03-06 |
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| CN113399683A (en) * | 2021-06-11 | 2021-09-17 | 上海应用技术大学 | SLM (selective laser melting) forming 18Ni300 die steel injection mold surface strengthening method |
| CN113699483A (en) * | 2021-08-31 | 2021-11-26 | 东风商用车有限公司 | Surface treatment technology of gear and gear |
| CN114001142A (en) * | 2021-10-26 | 2022-02-01 | 东风商用车有限公司 | High-load gear with low transmission noise and preparation method thereof |
| CN114921620A (en) * | 2022-05-24 | 2022-08-19 | 武汉联塑精密模具有限公司 | Processing technology of extrusion die |
| CN117062714A (en) * | 2021-11-04 | 2023-11-14 | 许克莱茵有限公司 | Press die and method for manufacturing pressed board |
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Application publication date: 20200306 |