For example, when identifying counterfeit products of Dongfeng Motor Company Diesel Engine Co., Ltd. and Shanghai Yichu General Machinery Co., Ltd., the identification of production serial numbers is an effective way. Appearance identification The parts produced by the regular factory are all processed and manufactured strictly according to the reasonable processing technology. The equipment level and technology level of these production plants are relatively high. Counterfeit and refurbished parts are mainly compared with the regular production factories in the production process. Big difference.
Therefore, these two types of accessories are quite different in terms of internal quality and appearance. Most of the intrinsic qualities of auto parts need to be inspected with destructive tests. However, if we understand the normal processes of a regular production factory, we can identify some inferior parts from the aspect of appearance roughness, dimensional accuracy, and surface treatment quality of parts.
Due to limited space, here are only examples. Oil seal. Silicone rubber and fluororubber are commonly used sealing rubbers with excellent properties and are odorless. The oil seal produced by a regular production factory has a fine appearance and good gloss, and there are type and factory names on the oil seal, and the font is clear. Identification method inferior oil seal uses ordinary rubber or poor quality raw materials, its heat resistance, oil resistance and cold resistance is poor, the surface color is dark, there is a kind of "smelly smell of rubber", the hand is flicked and the block is removed, the font on the oil seal is skewed or there is no name , Signs.
Three filters. Regular production plants mostly use imported or high-quality domestic filter paper. The paper is delicate, uniform, elastic, and has good filter effect. The adhesive has good elasticity, and the adhesive is firm. The filter paper is evenly folded, and the number of folds is more. The center tube uses hot-tin plated steel roll bars.
Shock absorbers. The drum damper of the regular production plant and the exterior paint layer of the oil storage cylinder are thick and adhere firmly. The connecting rod has a high surface finish, and the thread is complete and clean. The tensile resistance is greater than the compression resistance. Identification method Some workshops that refurbished the shock absorbers disassembled the old shock absorbers for recycling. After simple cleaning, they were loaded with poor quality oil seals, and the shock absorber housing was polished and putty on it for simple painting. The connecting rod threads have wear marks. Sometimes the sludge coating shell welding process can be seen to be thin and the paint layer is thin. It can be peeled off with a hard object, and can be traced through the paint layer. PuTTY can obviously feel the tensile and compressive resistance is small, non-uniform, and there is a sense of emptiness when pulling and pressing this type of shock absorber.
Due to the impact of production facilities, soil heating, etc., metal parts with unqualified heat treatment in counterfeit metal fittings account for a large proportion, mainly manifested as severe unqualified parts such as hardness, metal strength, and metallographic structure. The requirements are far from one another. The metallographic structure has a wide variety of defects, which are very impressive. It shows that there are many problems in the heat treatment process such as heating time, heating temperature, holding time, heating method and cooling medium.
Non-destructive testing of automotive metal parts or destructive physical and chemical inspections when necessary is very necessary, which can greatly reduce the chance of misuse of counterfeit parts. The surface hardness test is a widely used, economical, and quick test without destroying the parts. The key parts of the car, such as the engine crankshaft, camshaft, valve, tappet, axle, leaf spring, gear, general shaft parts and automotive fasteners, etc., can be first used to test the intrinsic quality of the hardness test, if necessary. Further analysis.
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