In the production process, the deterioration of mechanical equipment is difficult to avoid. Therefore, research on equipment degradation process should be carried out, problems should be discovered in time, and corresponding measures should be taken to prevent problems before they occur. It is necessary to eliminate the failures and occur to ensure production. Today, this paper mainly analyzes the types of degradation and the mechanism of occurrence of gravure printing machines, and clarifies the law of equipment degradation from the source, which is very beneficial for maintaining and repairing mechanical equipment and extending equipment life.
Classification of deterioration status of gravure equipment
The deterioration of the gravure printing machine can be classified into four categories according to technical reasons: wear deterioration, corrosion deterioration, fracture deterioration, and aging deterioration.
Wear degradation
Mechanical wear is a major manifestation of deterioration of the parts of the equipment that are relatively moving. Due to the wear of the moving parts, the limit value is exceeded at a certain time, causing deterioration. Wear refers to the dual surface of the machine that is in contact with each other during the working process, and the size, shape and surface quality change under friction. According to its formation mechanism, it is divided into four types: adhesion wear, surface fatigue wear, corrosion wear, and fretting wear.
2. Corrosive deterioration
The process of damage to equipment components under the action of environmental media (such as water, air, acid, alkali, salt solution and other corrosive gases), called metal corrosion, metal corrosion has its own characteristics: (1) from The metal surface begins to gradually penetrate and expand into the interior; (2) the metal surface changes, such as spalling, spots, dents, or adhesion to other metal compounds. This results in a decrease in the strength of the metal parts.
3. Fracture deterioration
It can be divided into fatigue fracture, stress corrosion fracture, plastic fracture, etc.: (1) fatigue fracture. Breakage caused by various factors such as thermal fatigue (such as high temperature fatigue), mechanical fatigue (divided into bending fatigue, torsional fatigue, contact fatigue, composite load fatigue, etc.) and fatigue in other complicated environments; 2) Stress corrosion cracking. A device with thermal stress, welding stress, residual stress or other applied tensile stress. If there is a corrosive medium matching the metal material at the same time, the material will be cracked, and a crack developed at a remarkable speed is stress. Corrosion fracture. Another example is the damage caused by hydrogen embrittlement and alkali brittleness, which is also stress corrosion cracking; (3) plastic fracture. Plastic fracture is caused by overload fracture and impact fracture, and is a common manifestation of deterioration of equipment parts. Before the fracture, the plastic deformation may occur first, and then the fracture occurs. This fracture is called plastic fracture; (4) brittle fracture. In the above case, sometimes the machine member does not have obvious plastic deformation, and breakage occurs. This fracture is called brittle fracture.
4. Aging fracture
The combination of various deterioration factors mentioned above, as well as aging of circuit components, aging of plastic rubber parts, etc., cause deterioration caused by aging of equipment performance.
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