Pay attention to the inspection of automobile sheet metal parts when purchasing

2022-06-20 10:49:53

1check whether the trademark is complete. The outer packaging of authentic products is of good quality. The writing on the packaging box is clear and the overprint color is bright. The packaging box and bag shall be marked with product name, specification, quantity, registered trademark, factory name, address and telephone number, etc. some manufacturers also make their own marks on the accessories. Some important components, such as generator, distributor, fuel injection pump, etc., are also equipped with operation instructions, certificates and inspector seals to guide users to use and maintain correctly. When purchasing, you should recognize carefully to prevent buying fake and inferior products.

2. check the geometric dimension for deformation. Some parts are easy to deform due to improper manufacturing, transportation and storage. During the inspection, roll the axle automobile parts along the glass plate for one circle, and judge whether the parts are bent by checking whether there is light leakage at the joint between the parts and the glass plate; When selecting and purchasing the steel plate or friction plate of the clutch driven plate, you can hold the steel plate and friction plate in front of your eyes to observe whether they are warped; When selecting and purchasing oil seal, the end face of oil seal with framework shall be round, which can fit with flat glass without deflection; The outer edge of the frameless oil seal shall be upright, and it shall be deformed by hand. It shall be able to return to the original state after releasing the hand. When purchasing various kinds of gaskets, you should also pay attention to check the geometric dimensions and shapes.

3. check whether the joint is flat. During the handling and storage of spare parts, due to vibration and collision, burr, indentation, damage or crack often occur at the joint, affecting the use of parts. Pay attention to check when purchasing.

4. check whether the surface of parts is rusted. The surface of qualified parts and components has both a certain degree of precision and a bright finish. The more important the parts and components are, the higher the precision is, and the more strict the rust prevention and corrosion prevention of the packaging is. Pay attention to the inspection when purchasing. If the parts are found to have rust spots, mildew spots, or the rubber parts are cracked or lose elasticity, or there are obvious turning tool lines on the journal surface, they should be replaced.

5. check whether the protective surface is intact. Most parts are factory coated. For example, piston pin and bearing bush are protected with paraffin; The piston ring and cylinder liner shall be coated with anti rust oil and wrapped with wrapping paper; Valves, pistons, etc. are sealed with plastic bags after being soaked in antirust oil. If the sealing sleeve is damaged, the packing paper is lost, or the rust preventive oil or paraffin is lost during purchase, it shall be returned and replaced.

6. check whether the bonding parts are loose. For accessories composed of two or more parts, the parts are assembled by press fitting, bonding or welding, and no looseness is allowed between them. For example, the oil pump plunger and adjusting arm are assembled by press fitting; The clutch driven wheel and the steel plate are riveted, and the friction plate and the steel plate are riveted or glued; The paper filter element framework and the filter paper are glued together; The wire ends of electrical equipment are welded. If any looseness is found during purchase, it shall be replaced.

7. check whether the rotating parts are flexible. When selecting rotating parts such as oil pump, rotate the pump shaft by hand and feel flexible without jamming; When purchasing rolling bearings, support the inner ring of the bearing with one hand and rotate the outer ring with the other hand. The outer ring should be able to rotate quickly and freely, and then stop rotating gradually. If the rotating parts do not rotate properly, it means that the internal parts are rusted or deformed. Do not buy them.

8. check the assembly components for any missing parts. Normal assembly components must be complete and intact to ensure smooth assembly and normal operation. If some small parts on some assembly components are omitted, the assembly components will not work or even be scrapped.