How to increase the service life of metal bellow seal？
Damage is one of the ways in which balanced bellow seals tend to fail. Controlling the regularity of damage to the balanced bellow seal, predicting the wear rate, and finding ways to increase the service life of the wear resistance is a key issue. The main forms of wear that can occur on conflicting surfaces are: adhesive wear, abrasive wear, fatigue wear, fretting wear and erosive wear.
1. Metal bellow seal adhesive wear
Due to the presence of rough asperities on the surface of the metal bellow seal, the surface contact occurs at loose asperities. When the conflict occurs at the contact point, the direct contact between the metals will appear when the lubricating film and the surface film are broken, and the continuous point is continuously cut off by shearing, and a new continuous point is generated at the same time. If the shear occurs at the joint interface, there is no wear on the two surfaces; if the shear occurs within the metal, there will be transfer of surface metal, and the surface will be damaged and worn. The phenomenon of metal transfer is an important characteristic of adhesive wear.
2. Abrasive wear of Rotary welded metal bellow seal
Abrasive wear is the most common form of wear, accounting for about half of the total wear. Abrasive wear is when the contact surface is relatively moved by hard particles or asperities on the harder surface. During the friction process, the surface is scratched and the surface material falls off. Abrasive wear is a "micro-cutting process". Abrasives will cause the surface layer material to be subjected to alternating deformation, resulting in alternating contact stress and fatigue damage to the surface. However, the mechanical action of abrasive particles on the surface always plays an important role.