The reason and treatment of round head needle rust

Because of the harm of all kinds of essential and external factors, the cylindrical roller bearing on the outside of the steel pin shaft will be corroded. Therefore, the actual cause of the problem should be fully grasped before the anti rust treatment is adopted. Then we can choose reasonable solutions purposefully.

The etching of the cylindrical roller bearing on the outside of the stamping die has its own raw materials, because it is made of 45 steel, so its composition and structure will be diazotized into embroidery. Naturally, it is also related to the surface smoothness of the cylindrical roller bearing on the outside of the stamping die. Generally, the charging battery with oxygen concentration difference is corroded.

In addition, the composition and pH value of aqueous solution in contact with the surface of cylindrical roller bearing on the outside of the stamping die; the working temperature and environmental humidity of the storage rolling bearing; various natural environmental substances in contact with the surface of the rolling bearing are all immediately harmful to the corrosion resistance of the cylindrical roller bearing on the outside of the stamping die.

In order to provide antirust treatment for the cylindrical roller bearing on the outside of the stamping die, first of all, pay attention to the cleaning of the mating surface of the pin shaft. The cleaning must be carried out in accordance with the characteristics of the surface of the antirust treatment and the standards at that time, and select the appropriate way. Generally, there are many cleaning methods such as organic solvent cleaning, organic chemical solution cleaning and mechanical equipment cleaning.

The surface of the cylindrical roller bearing on the outside of the stamping die can be compressed and dried with the filtered dry air after it is cleaned and tidy, or it can be carried out with the air dryer of 120-170 ℃, or it can be wiped with the clean sand cloth. On this basis, anti rust treatment can be carried out according to the bubble invasion method, that is to say, the cylindrical roller bearing on the outside of the stamping die is immediately soaked in the anti rust treatment vegetable oil, and the surface is adhered with a layer of anti rust treatment vegetable oil. The thickness of the floating oil can be exceeded according to the temperature or viscosity of the anti rust treatment vegetable oil.

In other words, the sweat of human hand will cause the rust of the standard outer cylindrical roller bearing of the pin shaft, because the sweat of human is a kind of liquid with no color, full transparency or light yellow, sweet and sour taste, in addition to sodium, potassium, calcium, magnesium salt, but also with a small amount of urea solution, Lactobacillus, sodium citrate and other citric acid. When the sweat touches the surface of the rolling bearing, a layer of sweat film will be formed on the surface of the rolling bearing. The sweat film will cause photoelectric catalytic effect on the rolling bearing, etch the rolling bearing, and then cause embroidery.

But it's hard to avoid the sweat of people. To avoid the rust caused by the sweat of hands, that is to say, the manufacturing staff should carry rubber gloves, fingertips, or take and place the rolling bearing with tools when stamping the cylindrical roller bearing on the outer side of the die on the assembly line. It's not necessary to touch the surface of the rolling bearing with hands at will.