CN115491673A - Preparation method and repair method of self-lubricating wear-resistant coating of rubber mechanical screw - Google Patents
Preparation method and repair method of self-lubricating wear-resistant coating of rubber mechanical screw Download PDFInfo
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- CN115491673A CN115491673A CN202211207737.1A CN202211207737A CN115491673A CN 115491673 A CN115491673 A CN 115491673A CN 202211207737 A CN202211207737 A CN 202211207737A CN 115491673 A CN115491673 A CN 115491673A
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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
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
- C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/12—Metallic powder containing non-metallic particles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/14—Treatment of metallic powder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
- B22F2009/043—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling by ball milling
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Abstract
The invention utilizes a mechanical ball milling method to mix the 38CrMoAl alloy powder and the h-BN powder according to the weight ratio of 90: 30 to obtain a self-lubricating wear-resistant coating composite powder material; the self-lubricating coating composite powder material is melted and deposited on the surface of the rubber mechanical screw by coaxial powder feeding laser cladding equipment, and the uniform preparation of the self-lubricating wear-resistant coating is realized by regulating and optimizing laser process parameters; redundant coating materials are removed by machining, so that the surface roughness is reduced, and the preparation of the coating with excellent wear resistance is realized. The process adopted by the invention does not need a high-temperature high-pressure environment, is simple to operate, high in processing efficiency, good in stability among batches, small in heat affected zone of the coating, small in influence on the core structure of the screw material, and greatly prolongs the service life of the screw. In addition, the process can also be used for repairing and remanufacturing the damaged rubber mechanical screw, so that the cycle service life of the rubber mechanical screw is greatly prolonged.
Description
Technical Field
The invention relates to a preparation method and a repair method of a self-lubricating wear-resistant coating of a rubber mechanical screw, belonging to the field of laser cladding.
Background
The screw is one of key core components in the field of rubber mechanical equipment, and is widely applied to equipment such as injection molding machines, extruders, open mills, rubber mixing machines and the like. In order to improve the wear resistance of the surface of the screw, the surface modification of the traditional rubber mechanical screw usually adopts an ion nitriding technology, and the technical defects are mainly shown as follows: 1. influenced by nitriding process parameters (temperature, time, air flow, placing position and the like) and turning surface quality, the screw treated by the traditional ion nitriding process still has the problems of poor wear resistance and non-uniform performance, so that the quality of the screw in batches is unstable and the service life of the screw is short; 2. the thickness of the traditional ionic nitriding layer follows the rule of parabola, nitriding treatment for tens of hours is generally needed to reach the nitriding layer with ideal thickness, the energy consumption is high, the cost is high, the efficiency is low, the excessive tempering of the center part of the screw is easily caused to reduce the fatigue performance, and the service stability and the service life of the screw are finally seriously influenced; 3. after the traditional rubber mechanical screw is damaged, the repairing process is complex generally, and the repairing quality cannot be ensured.
Therefore, there is a need to provide a new preparation method and repair method of self-lubricating wear-resistant coating for rubber mechanical screw to solve the above problems.
Disclosure of Invention
The invention aims to provide a preparation method of a self-lubricating wear-resistant coating of a rubber mechanical screw rod with high efficiency, stability and excellent performance and a repair method of a damaged screw rod.
In order to achieve the purpose, the invention provides the following technical scheme:
a preparation method of a self-lubricating wear-resistant coating of a rubber mechanical screw comprises the following steps:
s1, mixing 38CrMoAl alloy powder and h-BN powder according to a ratio of 90: 30, ball-milling the two mixed powders by using a mechanical ball-milling method, and fully and uniformly mixing to obtain a self-lubricating wear-resistant coating composite powder material;
s2, adding the self-lubricating wear-resistant coating composite powder material into a powder feeder of coaxial laser cladding equipment, and setting corresponding laser process parameters of the coaxial laser cladding equipment, wherein the laser process parameters are as follows: the laser power is 1500-2500W, the scanning speed is 13-17mm/s, the powder feeding speed of a powder feeder is 4r/min, the lapping rate is 50%, the self-lubricating wear-resistant coating composite powder material is melted and deposited on the surface of the rubber mechanical screw through the coaxial powder feeding laser cladding equipment, and the uniform preparation of the self-lubricating wear-resistant coating of the rubber mechanical screw is realized under the cooperative cooperation of the rubber mechanical screw and the coaxial laser cladding equipment.
Further, the volume ratio of the 38CrMoAl alloy powder to the h-BN powder in the self-lubricating wear-resistant coating composite powder material is 85.
Further, the laser process parameters are as follows: the laser power is 2300W, the scanning speed is 17mm/s, the powder feeding speed of the powder feeder is 4r/min, and the lapping rate is 50%.
Further, before the self-lubricating wear-resistant coating composite powder material is added into the powder feeder, drying treatment is carried out, and the drying treatment can adopt one of a far infrared heating furnace dryer, a metal powder dryer and a vacuum dryer.
Further, a vacuum drier is adopted in the drying treatment, the temperature is set to be 100 ℃, and the drying is carried out for 12 hours.
Further, a planetary ball mill is adopted in the ball milling and fully mixing process, the total ball milling time is 6h, and the ball milling interval is set to be 10min in the ball milling process for 20 min.
Further, the preparation method of the self-lubricating wear-resistant coating also comprises the following steps: and removing redundant materials on the surface of the self-lubricating wear-resistant coating by using a machine tool according to the size and precision requirements of the rubber mechanical screw to obtain the required self-lubricating wear-resistant coating.
Further, the self-lubricating wear-resistant coating needs to be subjected to wear rate and friction coefficient tests, a high-frequency reciprocating type friction and wear testing machine is adopted for the tests, and 3 samples of each batch of rubber mechanical screw rod are randomly extracted for testing.
A method for repairing a rubber mechanical screw is suitable for repairing the damaged surface of the rubber mechanical screw and comprises the following steps:
s1, adding the self-lubricating wear-resistant coating composite powder material as claimed in any one of claims 1 to 6 into a powder feeder of coaxial laser cladding equipment;
s2, planning and repairing a laser cladding path of the damaged rubber mechanical screw;
s3, setting laser process parameters of corresponding coaxial laser cladding equipment, wherein the laser process parameters are as follows: the laser power is 1500-2500W, the scanning speed is 13-17mm/s, the powder feeding speed of a powder feeder is 4r/min, the lap joint rate is 50%, and according to the planned laser cladding path, the self-lubricating wear-resistant coating composite powder material is melted and deposited on the damaged position of the rubber mechanical screw rod through the coaxial powder feeding laser cladding equipment, and the damaged position is restored by layer-by-layer accumulation.
Further, the planning of the laser cladding path comprises the following steps:
s1, collecting point data of a damaged position of the rubber mechanical screw by using a three-dimensional scanner, introducing the point data into general three-dimensional CAD software, and performing solid modeling by using a reverse module to obtain a CAD model of the damaged position;
s2, discretizing the CAD model, slicing and layering to obtain the section appearance of the layer corresponding to the damaged position, and further obtaining a laser cladding path for repairing the damaged rubber mechanical screw.
The invention has the beneficial effects that:
1. the self-lubricating wear-resistant coating of the rubber mechanical screw rod provided by the invention adopts composite alloy powder consisting of 38CrMoAl alloy powder and h-BN powder according to a certain proportion as raw materials, and the raw materials are uniformly mixed in a mechanical ball milling mode, so that the preparation operation of the raw materials is simple and convenient, the self-lubricating effect is increased, and the wear rate of the rubber mechanical screw rod is effectively reduced;
2. the preparation method of the self-lubricating wear-resistant coating of the rubber mechanical screw rod provided by the invention has the advantages that the self-lubricating wear-resistant coating material is melted and deposited on the surface of the screw rod by utilizing coaxial laser powder feeding cladding equipment, and the wear-resistant coating with excellent performance can be obtained by adjusting laser process parameters such as laser power, scanning speed, powder feeding rate, lap joint rate and the like, so that a high-temperature and high-pressure preparation environment is not needed, the processing efficiency is high, the stability among batches is good, meanwhile, the service life of the coating is ensured by metallurgical bonding between the coating and a substrate, and the wear resistance is better;
3. the laser cladding method provided by the invention can be used for carrying out local repair and remanufacture on the surface of the damaged rubber mechanical screw, greatly prolongs the cycle service life of the rubber mechanical screw and reduces the use cost.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to make the technical solutions of the present invention practical in accordance with the contents of the specification, the following detailed description is given of preferred embodiments of the present invention with reference to the accompanying drawings.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a preparation method and a repair method of a self-lubricating wear-resistant coating of a rubber mechanical screw.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
The invention discloses a preparation method of a self-lubricating wear-resistant coating of a rubber mechanical screw, which is suitable for efficiently and stably preparing the self-lubricating wear-resistant coating of the rubber mechanical screw, and the method does not need a high-temperature and high-pressure preparation environment, has high processing efficiency and good stability among batches; the self-lubricating wear-resistant coating of the prepared rubber mechanical screw has self-lubricating property and better wear resistance; the method can be used for repairing the surface of the damaged rubber mechanical screw, so that the recycling of the rubber mechanical screw is realized, and the service life is greatly prolonged.
The preparation steps of the self-lubricating wear-resistant coating are as follows:
mixing 38CrMoAl alloy powder and h-BN powder according to the weight ratio of 90: 30, in one embodiment of the invention, the volume ratio of the 38CrMoAl alloy powder to the h-BN powder is 85; in other embodiments, the volume ratio may also be 90.
And (3) ball-milling the two mixed powders by using a mechanical ball-milling method, and fully and uniformly mixing to obtain the self-lubricating wear-resistant coating composite powder material. In an embodiment of the invention, a planetary ball mill is adopted in the process of ball milling and fully mixing, the rotating speed of the ball mill is set to be 350r/min, the total ball milling time is set to be 6h, and ball milling is set to be 20min and is performed at an interval of 10min in the ball milling process, so that the self-lubricating wear-resistant coating composite powder material is obtained. The planetary ball mill can grind and mix products with different particle sizes and different materials by a dry method and a wet method, the minimum particle size of the ground product can reach 0.1 micron, and various technological parameter requirements can be well met; meanwhile, the device is a preferred device for researching a crushing process, a new material and a coating due to the advantages of small batch, low power consumption and low price; the ball milling material can be promoted to be uniformly mixed after the intermittent operation of 10min. In other embodiments, a tube ball mill, an energy-saving ball mill, or the like may be used, and the present invention is not limited thereto.
The self-lubricating wear-resistant coating composite powder material subjected to ball milling needs to be dried to remove water possibly absorbed by the 38CrMoAl alloy powder and prevent the water from affecting the laser cladding process. The drying treatment may be one of a far infrared heating furnace dryer, a metal powder dryer, and a vacuum dryer, which is not limited herein. In an embodiment of the invention, the drying treatment adopts a vacuum drier, the set temperature is 100 ℃, and the drying is carried out for 12 hours, so that the water possibly existing in the self-lubricating wear-resistant coating composite powder is thoroughly removed.
Adding the dried self-lubricating wear-resistant coating composite powder material into a powder feeder of coaxial laser cladding equipment, and setting corresponding laser process parameters of the coaxial laser cladding equipment, wherein in one embodiment of the invention, the laser process parameters corresponding to the self-lubricating wear-resistant coating composite powder material are as follows: the laser power is 2300W, the scanning speed is 17mm/s, the powder feeding speed of the powder feeder is 4r/min, and the lapping rate is 50%. The self-lubricating wear-resistant coating composite powder material is melted and deposited on the surface of the rubber mechanical screw by coaxial powder feeding laser cladding equipment, and the uniform preparation of the self-lubricating wear-resistant coating of the rubber mechanical screw can be realized under the cooperative match of the rubber mechanical screw and the coaxial laser cladding equipment; the setting of the lapping rate to 50% can avoid the occurrence of holes and non-density of the coating. In other embodiments, other laser process parameters can be used according to different proportions of the self-lubricating wear-resistant coating composite powder material, which is not limited herein.
According to the size and precision requirements of the rubber mechanical screw, redundant materials on the surface of the self-lubricating wear-resistant coating are removed by a machine tool, the roughness of the self-lubricating wear-resistant coating is further reduced, and the required self-lubricating wear-resistant coating of the rubber mechanical screw is obtained.
And testing the wear rate and the friction coefficient of the prepared self-lubricating wear-resistant coating of the rubber mechanical screw, wherein a high-frequency reciprocating type friction wear testing machine is adopted for testing, and 3 of samples of each batch of rubber mechanical screws are randomly extracted for testing.
The method for repairing the damaged rubber mechanical screw comprises the following steps:
collecting point data of the damaged position of the rubber mechanical screw by using a three-dimensional scanner, then introducing the point data into general three-dimensional CAD software, and performing solid modeling by using a reverse module to obtain a CAD model of the damaged position; discretizing the CAD model so as to slice and layer the model to obtain the section appearance of the layer corresponding to the damaged position and further obtain a laser cladding path for repairing the damaged rubber mechanical screw.
Adding the dried self-lubricating wear-resistant coating composite powder material into a powder feeder of coaxial laser cladding equipment, and setting laser process parameters of the corresponding coaxial laser cladding equipment: the method comprises the steps of laser power 2300W, scanning speed 17mm/s, powder feeding speed of a powder feeder 4r/min and lap joint rate 50%, according to a planned laser cladding path, melting and depositing the self-lubricating wear-resistant coating composite powder material to a damaged position of a rubber mechanical screw rod through coaxial powder feeding laser cladding equipment, and repairing the damaged position layer by layer.
And removing redundant materials on the surface of the repaired rubber mechanical screw by using a machine tool, further reducing the roughness of the repaired rubber mechanical screw, and obtaining the repaired rubber mechanical screw which can be recycled.
The preparation method and the repair method are further described with reference to specific examples.
Example 1:
s1, mixing 38CrMoAl alloy powder and h-BN powder according to the weight ratio of 85:15, putting the mixture into a planetary ball mill, setting the rotating speed of the ball mill to be 350r/min, setting the total ball milling time to be 6h, and setting the ball milling interval to be 10min in the ball milling process for 20 min; and placing the ball-milled powder in a vacuum drying oven for 12 hours, and setting the temperature to be 100 ℃ to obtain the self-lubricating wear-resistant coating composite powder.
S2, placing the dried self-lubricating wear-resistant coating composite powder in a laser cladding powder feeder, setting the rotating speed of the powder feeder to be 4r/min, the laser power to be 2300w, the scanning speed to be 17mm/S, the lap joint rate to be 50%, and preparing a uniform and compact self-lubricating wear-resistant coating; and removing redundant materials on the surface of the coating by using a machine tool to obtain the required self-lubricating wear-resistant coating of the rubber mechanical screw.
And S3, testing the wear rate and the friction coefficient of the successfully prepared self-lubricating wear-resistant coating, and determining that the average friction coefficient is about 0.33, the wear rate is about 52 percent of that of the traditional ion nitriding coating, and the performance of the self-lubricating wear-resistant coating is obviously superior to that of the traditional ion nitriding coating.
Example 2:
s1, mixing 38CrMoAl alloy powder and h-BN powder according to a volume ratio of 90; and (3) placing the ball-milled powder in a vacuum drying oven for 12 hours, and setting the temperature to be 100 ℃ to obtain the self-lubricating wear-resistant coating composite powder.
S2, placing the dried self-lubricating wear-resistant coating composite powder in a laser cladding powder feeder, setting the rotating speed of the powder feeder to be 4r/min, the laser power to be 1700w, the scanning speed to be 14mm/S, the lap joint rate to be 50%, and preparing a uniform and compact self-lubricating wear-resistant coating; and removing redundant materials on the surface of the coating by using a machine tool to obtain the required self-lubricating wear-resistant coating of the rubber mechanical screw.
S3, testing the wear rate and the friction coefficient of the successfully prepared self-lubricating wear-resistant coating, and measuring that the average friction coefficient is about 0.36, the wear rate is about 60 percent of that of the traditional ion nitriding coating, and the performance of the self-lubricating wear-resistant coating is obviously superior to that of the traditional ion nitriding coating, but the self-lubricating wear-resistant coating is not the same as that of a rubber mechanical screw rod which is obtained by performing laser cladding on a self-lubricating wear-resistant coating composite powder material with the volume ratio of 38CrMoAl alloy powder to h-BN powder being 90.
Example 3:
s1, mixing 38CrMoAl alloy powder and h-BN powder according to the weight ratio of 85:15, putting the mixture into a planetary ball mill, setting the rotating speed of the ball mill to be 350r/min, setting the total ball milling time to be 6h, and setting the ball milling interval to be 10min in the ball milling process for 20 min; and placing the ball-milled powder in a vacuum drying oven for 12 hours, and setting the temperature to be 100 ℃ to obtain the self-lubricating wear-resistant coating composite powder.
S2, scanning, three-dimensional modeling and slicing the damaged position of the screw, and planning a cladding path through a computer.
S3, placing the dried self-lubricating wear-resistant coating composite powder in a laser cladding powder feeder, setting the rotating speed of the powder feeder to be 4r/min, the laser power to be 2300w, the scanning speed to be 17mm/S and the overlapping rate to be 50%, carrying out laser cladding according to a planned cladding path, and stacking and repairing damaged positions layer by layer; and removing redundant materials on the surface of the repaired screw rod by using a machine tool to obtain the repaired rubber mechanical screw rod.
In conclusion, the self-lubricating wear-resistant coating of the rubber mechanical screw rod provided by the invention adopts the composite alloy powder consisting of the 38CrMoAl alloy powder and the h-BN powder according to a certain proportion as the raw materials, and the raw materials are uniformly mixed in a mechanical ball milling mode, so that the preparation operation of the raw materials is simple and convenient, the self-lubricating effect is improved, and the wear rate of the rubber mechanical screw rod is effectively reduced; the preparation method of the self-lubricating wear-resistant coating of the rubber mechanical screw rod provided by the invention has the advantages that the self-lubricating wear-resistant coating material is melted and deposited on the surface of the screw rod by utilizing coaxial laser powder feeding cladding equipment, and the wear-resistant coating with excellent performance can be obtained by adjusting laser process parameters such as laser power, scanning speed, powder feeding rate, lap joint rate and the like, so that a high-temperature and high-pressure preparation environment is not needed, the processing efficiency is high, the stability among batches is good, meanwhile, the service life of the coating is ensured by metallurgical bonding between the coating and a substrate, and the wear resistance is better; the laser cladding method provided by the invention can be used for carrying out local repair and remanufacture on the surface of the damaged rubber mechanical screw, greatly prolonging the cycle service life of the rubber mechanical screw and reducing the use cost.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A preparation method of a self-lubricating wear-resistant coating of a rubber mechanical screw is characterized by comprising the following steps:
s1, mixing 38CrMoAl alloy powder and h-BN powder according to a ratio of 90: 30, ball-milling the two mixed powders by using a mechanical ball-milling method, and fully and uniformly mixing to obtain a self-lubricating wear-resistant coating composite powder material;
s2, adding the self-lubricating wear-resistant coating composite powder material into a powder feeder of coaxial laser cladding equipment, and setting corresponding laser process parameters of the coaxial laser cladding equipment, wherein the laser process parameters are as follows: the laser power is 1500-2500W, the scanning speed is 13-17mm/s, the powder feeding speed of a powder feeder is 4r/min, the lap joint rate is 50%, the self-lubricating wear-resistant coating composite powder material is melted and deposited on the surface of the rubber mechanical screw rod through the coaxial powder feeding laser cladding equipment, and the uniform preparation of the self-lubricating wear-resistant coating of the rubber mechanical screw rod is realized under the cooperative match of the rubber mechanical screw rod and the coaxial laser cladding equipment.
2. The method for preparing the self-lubricating wear-resistant coating of the rubber mechanical screw according to claim 1, wherein the volume ratio of the 38CrMoAl alloy powder to the h-BN powder in the self-lubricating wear-resistant coating composite powder material is 85.
3. The method for preparing the self-lubricating wear-resistant coating of the rubber mechanical screw according to claim 2, wherein the laser process parameters are as follows: the laser power is 2300W, the scanning speed is 17mm/s, the powder feeding speed of the powder feeder is 4r/min, and the lap joint rate is 50%.
4. The method for preparing the self-lubricating wear-resistant coating of the screw rod of the rubber machine according to claim 1, wherein the powder material composite with the self-lubricating wear-resistant coating is dried before being added into the powder feeder, and the drying treatment can be one of a far infrared heating furnace dryer, a metal powder dryer and a vacuum dryer.
5. The method for preparing the self-lubricating wear-resistant coating of the rubber mechanical screw according to claim 4, wherein the drying treatment is performed by a vacuum drier at a set temperature of 100 ℃ for 12 hours.
6. The method for preparing the self-lubricating wear-resistant coating of the rubber mechanical screw according to claim 1, wherein the ball milling and the sufficient mixing are carried out by adopting a planetary ball mill, the total ball milling time is 6h, and the ball milling process is carried out for 20min and is interrupted for 10min.
7. The method for preparing a self-lubricating wear-resistant coating for a rubber mechanical screw according to claim 1, further comprising: and removing redundant materials on the surface of the self-lubricating wear-resistant coating by using a machine tool according to the size and precision requirements of the rubber mechanical screw to obtain the required self-lubricating wear-resistant coating.
8. The method for preparing the self-lubricating wear-resistant coating for the rubber mechanical screw according to claim 7, wherein the self-lubricating wear-resistant coating is subjected to wear rate and coefficient of friction tests, and the tests are carried out by randomly extracting 3 samples of each batch of the rubber mechanical screw by using a high-frequency reciprocating friction wear tester.
9. A method for repairing a rubber mechanical screw is suitable for repairing the damaged surface of the rubber mechanical screw and is characterized by comprising the following steps:
s1, adding the self-lubricating wear-resistant coating composite powder material as claimed in any one of claims 1 to 6 into a powder feeder of coaxial laser cladding equipment;
s2, planning and repairing a laser cladding path of the damaged rubber mechanical screw;
s3, setting laser process parameters of corresponding coaxial laser cladding equipment, wherein the laser process parameters are as follows: the laser power is 1500-2500W, the scanning speed is 13-17mm/s, the powder feeding speed of a powder feeder is 4r/min, the lap joint rate is 50%, and according to the planned laser cladding path, the self-lubricating wear-resistant coating composite powder material is melted and deposited on the damaged position of the rubber mechanical screw rod through the coaxial powder feeding laser cladding equipment, and the damaged position is restored by layer-by-layer accumulation.
10. The method for repairing a rubber mechanical screw of claim 9, wherein the planning of the laser cladding path comprises the steps of:
s1, collecting point data of a damaged position of the rubber mechanical screw by using a three-dimensional scanner, then importing the point data into general three-dimensional CAD software, and performing solid modeling by using a reverse module to obtain a CAD model of the damaged position;
s2, discretizing the CAD model, slicing and layering to obtain the section appearance of the layer corresponding to the damaged position, and further obtaining a laser cladding path for repairing the damaged rubber mechanical screw.
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| CN111058040A (en) * | 2020-01-16 | 2020-04-24 | 南京航空航天大学 | Laser cladding repair equipment and method for irregular curved surface of Invar alloy die |
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2022
- 2022-09-30 CN CN202211207737.1A patent/CN115491673A/en active Pending
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| US20040191064A1 (en) * | 2003-03-27 | 2004-09-30 | Wen Guo | Laser powder fusion repair of Z-notches with inconel 713 powder |
| CN104141129A (en) * | 2014-07-24 | 2014-11-12 | 燕山大学 | Repairing method for threaded rod |
| CN104087789A (en) * | 2014-07-28 | 2014-10-08 | 苏州大学 | Self-lubricating wear-resistant composite coating for titanium alloy surface and preparation method of self-lubricating wear-resistant composite coating |
| CN106956000A (en) * | 2017-03-09 | 2017-07-18 | 南京理工大学 | A kind of fast preparation method of TiAl-base alloy drip molding |
| CN110344053A (en) * | 2019-08-06 | 2019-10-18 | 贵州大学 | A kind of high-strength bainitic steel laser repairing alloy powder and preparation method thereof |
| CN111058040A (en) * | 2020-01-16 | 2020-04-24 | 南京航空航天大学 | Laser cladding repair equipment and method for irregular curved surface of Invar alloy die |
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