11/02
In the process of use, the spring shall be subject to the corrosion of harmful gases and work under the corrosion fatigue conditions, causing local corrosion damage on the steel wire surface to form stress concentration, and gradually expanding the corrosion fatigue cracks. The oxidation treatment can make the shell pulling hook spring have certain corrosion resistance. After oxidation treatment, the hook spring can form a dense oxide film on the steel wire surface, which can prevent the corrosion of gunpowder gas.
11/11
1, Setting treatment, setting spring "standing treatment", the compression spring after heat treatment compression to the height of the working limit load or high pressure and height (stretch the spring stretched to the length of the working limit load, torsion spring torsion to the working limit torsion Angle), A process in which one or more short compressions (stretches, twists) are made to stabilize the size of the spring collection.
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