Anti-corrosion and anti-loosening treatment method for metal part fastening connection joint surface coating

A technology of fastening connection and processing method, which is applied to the device, coating, anti-corrosion coating and other directions of applying liquid to the surface, which can solve the problems of loosening and loosening of metal parts, so as to improve the tightness, hardness, and prevent loosening. Effect

Active Publication Date: 2020-11-27
DONGFENG COMML VEHICLE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the above problems of loosening and loosening of metal parts caused by corrosion-resistant coatings, the purpose of the present invention is to provide a method for anti-corrosion and anti-loosening treatment of metal parts fastening connection joint surface coating, so as to improve the connection of metal parts fasteners. reliability

Method used

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  • Anti-corrosion and anti-loosening treatment method for metal part fastening connection joint surface coating

Examples

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Effect test

Embodiment 1

[0025] Example 1 Anti-corrosion and anti-loosening treatment method for the shaft-pin joint surface coating of commercial vehicle thrust rod assembly

[0026] combine figure 1 As shown, the thrust rod assembly is an important balance and force-bearing part. The thrust rod assembly includes a thrust rod 6 and a shaft pin 4, which are tightly connected with the drive axle thrust rod bracket 3 through bolts 5. After the bolt 5 is tightened, the shaft pin 4 The assembly first joint surface 1 of the shaft pin 4 is jointed with the drive axle thrust rod bracket 3, and the second joint joint surface 2 of the shaft pin 4 is jointed with the bolt 5. In order to improve the corrosion resistance of the shaft pin 4, it is generally necessary to connect Surface 1 and the second assembly surface 2 are coated with an anti-corrosion coating, but the coating is likely to cause the problem of bolt 5 loosening during driving. The purpose of the present invention is to prevent the phenomenon of b...

Embodiment 2

[0031] Embodiment 2 The anti-corrosion and anti-loosening treatment method of the axle wheel hub joint surface coating

[0032] The assembly joint surface between the axle hub and the wheel is a typical fastener connection joint surface, the reliability of the fastening connection is extremely important, and the bolt fastening connection between the axle hub and the wheel is prone to loosening, resulting in bolt breakage. Accidents such as wheel falling off. The method for processing the joint surface of the axle hub comprises the steps of:

[0033] (1) Pre-painting treatment: degrease, degrease and phosphate the axle hub joint surface with a roughness less than 8 microns. The degreasing process ensures that the parts and fastening joint surfaces are free of oil, and the phosphating film formed by the phosphating process can be compared with The coating achieves a good matching, in which the phosphating film thickness is 2 μm to 4 μm, and the film weight is 1g / m 2 ~3g / m 2 ....

Embodiment 3

[0037] Example 3 Anti-corrosion and anti-loosening treatment method of joint surface coating of commercial vehicle suspension bracket assembly

[0038] (1) Pre-painting treatment: degrease, degrease and phosphate the joint surface of the suspension bracket assembly with a roughness less than 10 microns. The film can be well matched with the protective coating, and the thickness of the phosphating film is 2 μm to 4 μm, and the film weight is 1g / m 2 ~3g / m 2 .

[0039] (2) Coating: Cathodic electrophoretic coating is adopted. The components of the coating include 65% epoxy resin and epoxy acrylic resin and 35% pigments and fillers. The pigments and fillers contain 0.4% molybdenum disulfide and 0.7% flake graphite The curing temperature of the coating is 180°C for 30 minutes. After curing, the thickness of the coating is 28 microns, the thickness uniformity is ±3 μm, the salt spray resistance of the coating is 480 hours, and the hardness of the coating is H. The coefficient of ...

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Abstract

The invention relates to the technical field of metal part surface treatment, in particular to an anti-corrosion and anti-loosening treatment method for a metal part fastening connection joint surfacecoating. The anti-corrosion and anti-loosening treatment method comprises the steps that a metal piece with the joint face roughness smaller than 13 micrometers is subjected to pre-painting treatment, then the joint face of the metal piece is coated, so that a uniform and continuous coating is formed on the joint face of the metal piece, and then the coating is dried and cured. The coating comprises the following components in percentage by weight: 45-65% of resin and 35-55% of pigment and filler, the pigment and filler contains molybdenum disulfide and flake graphite, the weight percentage of the molybdenum disulfide in the pigment and filler is less than or equal to 1%, and the weight percentage of the flake graphite in the pigment and filler is less than or equal to 1%. The thickness of the coating is 15-40 microns, the thickness uniformity of the coating is + / -5 microns, the friction coefficient of the coating is 0.08-0.2, and the hardness of the coating is HB-2H. Loosening causedby the coating can be prevented, and the reliability of metal part fastening connection is improved.

Description

technical field [0001] The invention relates to the technical field of surface treatment of metal parts, in particular to an anti-corrosion and anti-loosening treatment method for fastened joint surface coatings of metal parts. Background technique [0002] In the automobile assembly process, the fastener connection is the main connection method of parts. Due to the different loads on the parts, in addition to the manufacturing process of the part itself and the performance of the fastener, the reliability of the fastener is also related to the two parts. The performance of the coating on the joint surface is related. The two fastened metal parts in automobile assembly mainly include: forgings (such as the fastened connection between the thrust rod shaft pin of the commercial vehicle suspension system and the thrust rod bracket on the drive axle), castings (such as the front end of the commercial vehicle) The fastening connection between the bracket and the frame), stamping...

Claims

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Application Information

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IPC IPC(8): C09D163/00C09D133/04C09D177/00C09D163/10C09D5/08C09D7/61B05D3/10
CPCC09D163/00C09D133/04C09D177/00C09D163/10C09D5/08C09D7/61C09D7/70B05D3/102C08K2003/3009C08L33/04C08K3/30C08K7/00C08K3/04C08L63/00C08L77/00C08L63/10
Inventor 李卫夏威夷刘安心周全孟东阳许源胡凯鑫
Owner DONGFENG COMML VEHICLE CO LTD
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