CN112246584A - Rust prevention process for new energy automobile transmission shaft - Google Patents
Rust prevention process for new energy automobile transmission shaft Download PDFInfo
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- CN112246584A CN112246584A CN202010922061.9A CN202010922061A CN112246584A CN 112246584 A CN112246584 A CN 112246584A CN 202010922061 A CN202010922061 A CN 202010922061A CN 112246584 A CN112246584 A CN 112246584A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/10—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by other chemical means
- B05D3/102—Pretreatment of metallic substrates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/12—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by mechanical means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/56—Three layers or more
- B05D7/58—No clear coat specified
- B05D7/584—No clear coat specified at least some layers being let to dry, at least partially, before applying the next layer
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention discloses an antirust process for a new energy automobile transmission shaft, which comprises the steps of fixing a dried transmission shaft through a clamping device again, uniformly and directly spraying a composite coating agent on a painted surface by using high-pressure spraying equipment, taking the transmission shaft off the clamping device, drying for the third time for later use, finally clamping and fixing the transmission shaft to uniformly coat a seal glaze on the surface of the transmission shaft, taking the transmission shaft off the clamping device, and drying the transmission shaft coated with the seal glaze for the last time. This rust-resistant technology is used to new energy automobile transmission shaft has solved the moisture and can corrode the transmission shaft of car bottom to and the air produces chemical reaction, leads to the oxidation to make the transmission shaft rust, makes the car when using, and the transmission shaft can take place the abnormal sound of sound when the transmission shaft drives the rotation, in addition at the transmission shaft in the problem of the life-span of the great reduction use of ability when rotating.
Description
Technical Field
The invention relates to the technical field of automobile parts, in particular to an antirust process for a new energy automobile transmission shaft.
Background
The propeller shaft is a shaft capable of transmitting power among propeller shafts of a universal transmission. It is a high speed, less supported rotating body, so its dynamic balance is crucial. The dynamic balance test is carried out on a general transmission shaft before leaving a factory, and the transmission shaft is adjusted on a balancing machine. For a vehicle driven by a front engine and a rear wheel, the rotation of a speed changer is transmitted to a shaft of a main speed reducer, the speed changer can be provided with a plurality of joints, the joints can be connected by universal joints, and a transmission shaft consists of a shaft tube, a telescopic sleeve and the universal joints. The transmission shaft is connected or assembled with various accessories, and movable or rotatable round object accessories are generally made of alloy steel pipes with light weight and good torsion resistance. In the case of a front engine rear wheel drive vehicle, the transmission is connected to the final drive shaft in several joints by universal joints. It is a high speed, less supported rotating body, so its dynamic balance is crucial. The dynamic balance test is carried out on a common transmission shaft before leaving a factory, the transmission shaft is adjusted on a balancing machine, and the telescopic sleeve can automatically adjust the change of the distance between the transmission and the drive axle. The universal joint ensures the change of the included angle between the two axes of the output shaft of the speed changer and the input shaft of the drive axle and realizes the equal angular speed transmission of the two axes, the transmission shaft is an important part for transmitting power in the automobile transmission system and has the function of transmitting the power of an engine to wheels together with a speed changing box and the drive axle so as to ensure that the automobile generates driving force. The transmission shaft telescopic sleeve with the traditional structure is formed by welding a spline sleeve and a flange yoke together and welding a spline shaft on a transmission shaft tube. A transmission shaft of GWB company changes the traditional structure, a spline sleeve and a transmission shaft tube are welded into a whole, and a spline shaft and a flange fork are manufactured into a whole. And the rectangular tooth spline is changed into a large-pressure-angle involute short tooth spline, so that the strength is increased, the extrusion forming is facilitated, and the requirement of a large-torque working condition is met. The surface of the tooth of the telescopic sleeve and the spline shaft is integrally coated and soaked with a layer of nylon material, so that the wear resistance and the self-lubricating property are increased, the damage of impact load to a transmission shaft is reduced, and the buffer capacity is improved.
The vehicle is gone on the way, it is the inevitable thing to run into sleet weather or cross muddy ponding road surface, lead to in the air moisture can enter into some gaps such as automobile body bottom and places such as floor in the car, under long-term accumulation, the moisture can corrode the transmission shaft of car bottom, and the air produces chemical reaction, lead to the oxidation to make the transmission shaft rust, make the car when using, the transmission shaft drives the abnormal sound that can take place sound when the drive rotates, in addition at the transmission shaft life-span that the reduction that can be great when rotating is used.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides an anti-rust process for a transmission shaft of a new energy automobile, which solves the problems that the transmission shaft at the bottom of the automobile is corroded by moisture, the transmission shaft is oxidized to rust due to chemical reaction of air, the transmission shaft generates sound abnormal sound when the transmission shaft is driven to rotate when the automobile is used, and in addition, the service life of the transmission shaft is greatly shortened when the transmission shaft rotates.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: an antirust process for a new energy automobile transmission shaft comprises the following steps:
s1, preparing; firstly, roughly processing the produced transmission shaft, removing burrs and impurities on the surface by using a polishing sheet for the first time, polishing the surface of the transmission shaft with high precision by using a polishing sheet for the second time by using fine processing, putting the polished transmission shaft into a compound cleaning pool for soaking, fishing out the soaked transmission shaft, and drying for later use;
s2, spraying paint; fixing the transmission shaft dried and reserved in the step S1 by using a clamping device, uniformly spraying paint on the surface of the transmission shaft by using a paint spraying device, taking the transmission shaft off the clamping device, and drying the paint surface;
s3, coating a compound coating agent on the paint surface; fixing the transmission shaft dried in the step S2 through the clamping device again, performing uniform and direct spraying of the composite coating on the paint surface by using high-pressure spraying equipment, taking the transmission shaft down from the clamping device, and performing tertiary drying for later use;
s4, surface sealing glaze; and finally, clamping and fixing the transmission shaft to uniformly coat the sealing glaze on the surface of the transmission shaft, taking the transmission shaft down from the clamping equipment, and drying the transmission shaft coated with the sealing glaze for the last time.
Preferably, the grain number of the rough-machining grinding chip in the step S1 is 80#, and the grain number of the finish-machining grinding chip is 120#, the time of the rough-machining grinding is 5-10min, and the time of the finish-machining grinding is 15-20 min.
Preferably, the compound washing tank in the step S1 is soaked for 5-10min, the dryer is used for drying in the step S1, and the drying time and the drying temperature are respectively 3-5min and 30-50 ℃.
Preferably, the thickness of the surface paint of the transmission shaft in the step S2 is 20-30um, and the time and the temperature for drying the paint are 10-20min and 50-80 ℃.
Preferably, the thickness of the composite coating agent in the step S3 is 5-10um, and the drying time and temperature of the composite coating agent are 5-10min and 50-80 ℃.
Preferably, the pressure of the high pressure spraying apparatus in the step S3 is 2900PSI/CM 2.
Preferably, the compound coating agent in the step S3 is a mixture of rubber, wax, mineral oil, nonferrous metal, and the like.
Preferably, the thickness of the sealing glaze in the step S4 is 1-3um, and the drying time and temperature are 2-5min and 20-40 deg.C respectively
(III) advantageous effects
The invention provides an antirust process for a new energy automobile transmission shaft. Compared with the prior art, the method has the following beneficial effects:
1. this rust-proof technology for new energy automobile transmission shaft, the transmission shaft that passes through uses clamping device to fix it, through paint spraying equipment, carry out even spraying paint with the transmission shaft surface, take off the transmission shaft from clamping device, will carry out the stoving on paint surface, the transmission shaft of stoving is fixed through clamping device once more, use high-pressure spraying equipment to carry out the even direct spraying of compound coating agent to the lacquer painting, take off the transmission shaft from clamping device, it is reserve to carry out the tertiary stoving, compound coating agent is the compound coating agent on the basis of rubber, wax, mineral oil and non ferrous metal etc., can effectively control the formation of metal surface rust stain. The compound coating agent has elasticity, can cushion the striking of rubble, give sound insulation, it is thermal-insulated, the adhesion strength is strong, the long effect of anti-oxidant time, it can corrode the transmission shaft of car bottom to have solved the moisture, and the air produces chemical reaction, lead to the oxidation to make the transmission shaft rust, make the car when using, the transmission shaft drives the abnormal sound that can take place sound when rotating, in addition the transmission shaft is rotating the problem of the life-span of reduction that can be great.
2. This rust-proof technology for new energy automobile transmission shaft carries out last centre gripping through the transmission shaft and fixes, carries out even sealed glaze to scribble to the surface of transmission shaft, takes off the transmission shaft from the centre gripping equipment at last, carries out the stoving of last time at the transmission shaft after will scribbling sealed glaze, seals the glaze and can form netted firm protection film to the surface of transmission shaft, improves the hardness of lacquer painting, can effectually make transmission shaft surface acid rain resistant, anticorrosion, makes the difficult effect of drying crack and droing of original protective layer.
Drawings
FIG. 1 is a flow diagram of the process of the present invention;
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The embodiment of the invention provides a technical scheme that: an antirust process for a new energy automobile transmission shaft comprises the following steps:
s1, preparing; firstly, roughly processing the produced transmission shaft, removing burrs and impurities on the surface by using a polishing sheet for the first time, polishing the surface of the transmission shaft with high precision by using a polishing sheet for the second time by using fine processing, putting the polished transmission shaft into a compound cleaning pool for soaking, fishing out the soaked transmission shaft, and drying for later use;
s2, spraying paint; fixing the transmission shaft dried and reserved in the step S1 by using a clamping device, uniformly spraying paint on the surface of the transmission shaft by using a paint spraying device, taking the transmission shaft off the clamping device, and drying the paint surface;
s3, coating a compound coating agent on the paint surface; fixing the transmission shaft dried in the step S2 through the clamping device again, performing uniform and direct spraying of the composite coating on the paint surface by using high-pressure spraying equipment, taking the transmission shaft down from the clamping device, and performing tertiary drying for later use;
s4, surface sealing glaze; and finally, clamping and fixing the transmission shaft to uniformly coat the sealing glaze on the surface of the transmission shaft, taking the transmission shaft down from the clamping equipment, and drying the transmission shaft coated with the sealing glaze for the last time.
Further, the grain number of the rough-machining sanding sheet in the step S1 is 60#, and the grain number of the finish-machining sanding sheet is 100#, the time of the rough-machining sanding is 5min, and the time of the finish-machining sanding is 15 min.
Further, the compound washing tank in the step S1 is soaked for 5min, and the dryer is used for drying in the step S1, and the drying time and temperature are 3min and 30 ℃.
Further, the thickness of the surface paint of the transmission shaft in the step S2 is 20um, and the time and the temperature for drying the paint are respectively 10min and 50 ℃.
Further, the thickness of the composite coating agent in the step S3 is 5um, and the drying time and temperature of the composite coating agent are 5min and 50 ℃.
Further, the pressure of the high pressure spray equipment in the step of S3 is 2500PSI/CM 2.
Further, the compound coating agent in step S3 is a mixture of rubber, wax, mineral oil, nonferrous metals, and the like.
Further, the thickness of the sealing glaze in the step S4 is 1um, and the drying time and the drying temperature are respectively 2min and 20 DEG C
Example 2
The embodiment of the invention provides a technical scheme that: an antirust process for a new energy automobile transmission shaft comprises the following steps:
s1, preparing; firstly, roughly processing the produced transmission shaft, removing burrs and impurities on the surface by using a polishing sheet for the first time, polishing the surface of the transmission shaft with high precision by using a polishing sheet for the second time by using fine processing, putting the polished transmission shaft into a compound cleaning pool for soaking, fishing out the soaked transmission shaft, and drying for later use;
s2, spraying paint; fixing the transmission shaft dried and reserved in the step S1 by using a clamping device, uniformly spraying paint on the surface of the transmission shaft by using a paint spraying device, taking the transmission shaft off the clamping device, and drying the paint surface;
s3, coating a compound coating agent on the paint surface; fixing the transmission shaft dried in the step S2 through the clamping device again, performing uniform and direct spraying of the composite coating on the paint surface by using high-pressure spraying equipment, taking the transmission shaft down from the clamping device, and performing tertiary drying for later use;
s4, surface sealing glaze; and finally, clamping and fixing the transmission shaft to uniformly coat the sealing glaze on the surface of the transmission shaft, taking the transmission shaft down from the clamping equipment, and drying the transmission shaft coated with the sealing glaze for the last time.
Further, the grain number of the rough-machining sanding sheet in the step S1 is 70#, and the grain number of the finish-machining sanding sheet is 110#, the time of the rough-machining sanding is 7.5min, and the time of the finish-machining sanding is 17.5 min.
Further, the compound washing tank in the step S1 is soaked for 7.5min, and the dryer is used for drying in the step S1, and the drying time and temperature are 4min and 45 ℃.
Further, the thickness of the surface paint of the transmission shaft in the step S2 is 15um, and the time and the temperature for drying the paint are 15min and 65 ℃.
Further, the thickness of the composite coating agent in the step S3 is 7um, and the drying time and temperature of the composite coating agent are 7.5min and 65 ℃.
Further, the pressure of the high pressure spray equipment in the step S3 is 2700PSI/CM 2.
Further, the compound coating agent in step S3 is a mixture of rubber, wax, mineral oil, nonferrous metals, and the like.
Further, the thickness of the sealing glaze in the step S4 is 2um, and the drying time and the drying temperature are respectively 2.5min and 30 DEG C
Example 3
The embodiment of the invention provides a technical scheme that: an antirust process for a new energy automobile transmission shaft comprises the following steps:
s1, preparing; firstly, roughly processing the produced transmission shaft, removing burrs and impurities on the surface by using a polishing sheet for the first time, polishing the surface of the transmission shaft with high precision by using a polishing sheet for the second time by using fine processing, putting the polished transmission shaft into a compound cleaning pool for soaking, fishing out the soaked transmission shaft, and drying for later use;
s2, spraying paint; fixing the transmission shaft dried and reserved in the step S1 by using a clamping device, uniformly spraying paint on the surface of the transmission shaft by using a paint spraying device, taking the transmission shaft off the clamping device, and drying the paint surface;
s3, coating a compound coating agent on the paint surface; fixing the transmission shaft dried in the step S2 through the clamping device again, performing uniform and direct spraying of the composite coating on the paint surface by using high-pressure spraying equipment, taking the transmission shaft down from the clamping device, and performing tertiary drying for later use;
s4, surface sealing glaze; and finally, clamping and fixing the transmission shaft to uniformly coat the sealing glaze on the surface of the transmission shaft, taking the transmission shaft down from the clamping equipment, and drying the transmission shaft coated with the sealing glaze for the last time.
Further, the grain number of the rough-machining sanding sheet in the step S1 is 80#, and the grain number of the finish-machining sanding sheet is 120#, the time of the rough-machining sanding is 10min, and the time of the finish-machining sanding is 20 min.
Further, the compound washing tank in the step S1 is soaked for 10min, and the dryer is used for drying in the step S1, and the drying time and temperature are 5min and 50 ℃.
Further, the thickness of the surface paint of the transmission shaft in the step S2 is 30um, and the time and the temperature for drying the paint are 20min and 80 ℃.
Further, the thickness of the composite coating agent in the step S3 is 10um, and the drying time and temperature of the composite coating agent are 10min and 80 ℃.
Further, the pressure of the high pressure spraying apparatus in the step S3 is 2900PSI/CM 2.
Further, the compound coating agent in step S3 is a mixture of rubber, wax, mineral oil, nonferrous metals, and the like.
Further, the thickness of the sealing glaze in the step S4 is 3um, and the drying time and temperature are 5min and 40 ℃.
In this embodiment, when the surfaces of the transmission shaft are subjected to steps S2, S3 and S4, the parts of the transmission shaft requiring the rotation structure are avoided, so as to avoid the situation that the rotation structure of the transmission shaft is difficult or difficult to rotate.
And those not described in detail in this specification are well within the skill of those in the art.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The rust prevention process for the new energy automobile transmission shaft is characterized by comprising the following steps of:
s1, preparing; firstly, roughly processing the produced transmission shaft, removing burrs and impurities on the surface by using a polishing sheet for the first time, polishing the surface of the transmission shaft with high precision by using a polishing sheet for the second time by using fine processing, putting the polished transmission shaft into a compound cleaning pool for soaking, fishing out the soaked transmission shaft, and drying for later use;
s2, spraying paint; fixing the transmission shaft dried and reserved in the step S1 by using a clamping device, uniformly spraying paint on the surface of the transmission shaft by using a paint spraying device, taking the transmission shaft off the clamping device, and drying the paint surface;
s3, coating a compound coating agent on the paint surface; fixing the transmission shaft dried in the step S2 through the clamping device again, performing uniform and direct spraying of the composite coating on the paint surface by using high-pressure spraying equipment, taking the transmission shaft down from the clamping device, and performing tertiary drying for later use;
s4, surface sealing glaze; and finally, clamping and fixing the transmission shaft to uniformly coat the sealing glaze on the surface of the transmission shaft, taking the transmission shaft down from the clamping equipment, and drying the transmission shaft coated with the sealing glaze for the last time.
2. The rust prevention process for the transmission shaft of the new energy automobile according to claim 1, characterized in that: the grain number of the rough machining polishing disc in the step S1 is 80#, the grain number of the finish machining polishing disc is 120#, the time of rough machining polishing is 5-10min, and the time of finish machining polishing is 15-20 min.
3. The rust prevention process for the transmission shaft of the new energy automobile according to claim 1, characterized in that: the compound cleaning pool in the step S1 is soaked for 5-10min, a dryer is used for drying in the step S1, and the drying time and the drying temperature are respectively 3-5min and 30-50 ℃.
4. The rust prevention process for the transmission shaft of the new energy automobile according to claim 1, characterized in that: the thickness of the surface paint of the transmission shaft in the step S2 is 20-30um, and the time and the temperature for drying the paint are 10-20min and 50-80 ℃ respectively.
5. The rust prevention process for the transmission shaft of the new energy automobile according to claim 1, characterized in that: the thickness of the composite coating agent in the step S3 is 5-10um, and the drying time and temperature of the composite coating agent are 5-10min and 50-80 ℃ respectively.
6. The rust prevention process for the transmission shaft of the new energy automobile according to claim 1, characterized in that: and the pressure of the high-pressure spraying equipment in the step S3 is 2900PSI/CM 2.
7. The rust prevention process for the transmission shaft of the new energy automobile according to claim 1, characterized in that: the composite coating agent in the step S3 is a mixture of rubber, wax, mineral oil, nonferrous metals and the like.
8. The rust prevention process for the transmission shaft of the new energy automobile according to claim 1, characterized in that: the thickness of the sealing glaze in the step S4 is 1-3um, and the drying time and temperature are 2-5min and 20-40 ℃ respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010922061.9A CN112246584A (en) | 2020-09-04 | 2020-09-04 | Rust prevention process for new energy automobile transmission shaft |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010922061.9A CN112246584A (en) | 2020-09-04 | 2020-09-04 | Rust prevention process for new energy automobile transmission shaft |
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| CN112246584A true CN112246584A (en) | 2021-01-22 |
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| CN202010922061.9A Withdrawn CN112246584A (en) | 2020-09-04 | 2020-09-04 | Rust prevention process for new energy automobile transmission shaft |
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| US6110525A (en) * | 1997-09-12 | 2000-08-29 | Pro-Sol, Inc. | Coating composition for protecting surfaces and method of using same |
| CN102618044A (en) * | 2011-01-27 | 2012-08-01 | 中科合成油技术有限公司 | Antirust wax |
| CN105839115A (en) * | 2016-05-30 | 2016-08-10 | 方雪锋 | Coating process for transmission shaft spline shaft |
| CN110508470A (en) * | 2019-08-30 | 2019-11-29 | 江苏如非轴承科技有限公司 | A kind of surface anticorrosion processing method of radial bearing |
| CN111001524A (en) * | 2020-01-15 | 2020-04-14 | 磐安艾肯机械设备有限公司 | Rust-proof paint spraying apparatus for gear surface |
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2020
- 2020-09-04 CN CN202010922061.9A patent/CN112246584A/en not_active Withdrawn
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Application publication date: 20210122 |