Six major elements of daily maintenance of pan head machine screws

Cars often drive to 4S stores for maintenance after a period of time. The computers we use often do not clean up unwanted software or garbage to keep the computer running. We can find that everything needs to be maintained for longer. So how do we maintain the pan head machine screws?

1. Pollution generated during rinsing
Screw fasteners are prone to contamination with dirt and dirt during production. Therefore, the pan head machine screws are usually cleaned by silicate cleaning agent after quenching, and then rinsed, so we should clean them during rinsing to prevent residual dirt.

2. Problems with the placement of pan head machine screws.

pan head machine screws should be placed as dry as possible, isolated from the ground. Because the pan head machine screws will change color after tempering, there may be oily residue after soaking with ether. If the screw fasteners are stacked unreasonably, it will easily lead to oxidation of the screw fasteners.

3. Residues on the surface of the pan head machine screws.

White residue on the high-strength bolts was analyzed by instrument and confirmed to be phosphide. This reaction was produced because the acid washing machine was not cleaned and the rinsing tank was not thoroughly inspected to produce. This phosphide is prone to oxidative rust when exposed to air for a long time.

4. Snail
The high-strength bolt quenching residual heat is black with a uniform, flat oil black outer surface. It was detected as caused by alkali burns. Therefore, the steel fasteners cannot remove the surface alkaline substances in the quenching oil, thereby causing the surface to burn at a high temperature and aggravating the damage during tempering. Shishitong screw manufacturers recommend thoroughly cleaning and rinsing the fasteners before heat treatment to completely remove the alkaline residue that causes the fasteners to burn.

Fifth, improper rinsing.

For large-size pan head machine screws, it is often quenched with a polymer aqueous solution. It is cleaned and rinsed with an alkaline cleaner before quenching. After quenching, the fasteners are rusted on the inside. Therefore, it is necessary to change the rinsing water frequently to ensure that the screw fastener will not rust during rinsing.

6. Excessive rust.
High-strength fasteners often see some black streaks, which are contaminants of surface residues, which are baked quenching oils that evolve during the quenching process. Because the quenching oil is excessively aged, it is recommended to add new oil.

In addition to the above problems encountered in production, we also need to pay attention to the maintenance of the pan head machine screws when using, the use of proper maintenance can make the screw fasteners last longer.

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