What are the surface defects often appear in car springs POGOPIN

　　(1) Cracks in car spring Pogopin are mainly caused by material manufacturing. The cracks are extended along the pull direction, and the depth can be vertically distributed from several millimeters to more than 1 mm. The rupture material cannot be used to make spring Pogopin.

　　(2) If the impurities on the oxide or material rough are removed properly, the surface of the material will feel rough and uneven on the surface of the material. Sometimes the spikes will pierce the fingers. After entering the spring Pogopin, you will find the spring Pogopin surface peel or wrinkle. Materials with severe scaling cannot be used to make spring POGOPIN. After rolling into the local scales, the springs of the scales must be cleared, and the slight material can be cleaned with a shot of shots. For materials with local scale, you can consider unimportant spring Pogopin.

　　(3) The scratching and drawing of the car spring POGOPIN are mainly caused by the mold holes during the depth. The rough surfaces of rolling, guidance boards, top rods and other tools are drawn on the spring POGOPIN surface when the spring Pogopin rolls. The stretching direction of raw materials is generally distributed. For spring POGOPIN that does not exceed the tissue tolerance specifies of the scratching and pulling depth, it is not advisable to create a spring Pogopin with high fatigue performance, such as valve spring POGOPIN, plunger spring POGOPIN, etc.

　　(4) Most of the concave pits when pulling are impurities or oxide on the surface of the steel wire, and then fall off to form a pit. For some parts of some parts with concave pits, the spring Pogopin on the surface should be cleared after rolling into a spring POGOPIN. Wide -distributed materials are not used in the manufacture of spring POGOPIN.

　　(5) The reason for the corrosion of car spring POGOPIN is that the material is not rusted before the factory, and the other may be caused by improper storage. Slight rusty materials can be polished with sandpaper. If there is no obvious corrosion pit, you can use it. If there is a corrosion pit, it is not used to make spring POGOPIN.

　　(6) Send pattern, also known as hair pattern, shallow depth, and severe cracks. Visually, the surface of the material has filaments, and you can tear it off by hand. Filament materials are not used to make spring POGOPIN.

　　(7) This kind of wire is touched by hand, and it can obviously feel uneven thickness, similar to bamboo. Most of these defects are produced during the brushes, among which fine steel wires are the most common. The craftsmanship of the bouncing steel wire affects the spiral spring POGOPIN, which causes the spiral spring Pogopin inner and outer diameter to control the unstable control and affect the spring Pogopin load. Therefore, for the spring Pogopin with higher internal and external diameters and loads, bamboo steel wires cannot be used. Spring POGOPIN, which is low in internal and outer diameter and no load requirements, can be considered.

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