In the production process, the deterioration of mechanical equipment is inevitable. Therefore, the process of equipment degradation should be studied, problems should be discovered in time, and corresponding measures should be taken to prevent problems before they occur. It is necessary to ensure that production is eliminated and eliminated. Today, this article mainly analyzes the type and mechanism of deterioration that often occurs in gravure printing machines, and understands the law of equipment degradation from the source, which is very beneficial to maintenance and repair of mechanical equipment and prolong the life of equipment.
Classification of deterioration state of gravure printing equipment
Degradation of gravure presses can be divided into four categories according to technical reasons: namely, deterioration in abrasion, deterioration in corrosion, deterioration in fracture, and deterioration in aging.
1. Deterioration of abrasion
Mechanical wear is the main form of deterioration of the parts in the equipment that make relative movements. Due to wear of moving parts, the limit value is exceeded at a certain moment, causing deterioration. Abrasion refers to the phenomenon that the dual surfaces of the machines that are in contact with each other for relative movement during the work process change in size, shape and surface quality under the action of friction. According to its formation mechanism, it is divided into four types: adhesive wear, surface fatigue wear, corrosion wear, and fretting wear.
2. Corrosion deterioration
The equipment and parts are damaged under the action of environmental media (such as water, air, acid, alkali, salt solution and other corrosive gases, etc.), which is called metal corrosion. Metal corrosion has its own characteristics: (1) The metal surface begins to gradually penetrate and expand into the interior; (2) The metal surface changes, such as peeling, spots, dents, or adhesion of other metal compounds. As a result, the strength of the metal parts is reduced.
3. Deterioration of fracture
Can be divided into fatigue fracture, stress corrosion fracture, plastic fracture, etc .: (1) Fatigue fracture. Fractures caused by a combination of 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 complex 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 that matches the metal material at the same time, it will cause the material to crack, and a kind of crack that develops at a significant rate is stress. Corrosion fracture. Another example is the damage caused by the so-called hydrogen embrittlement and alkali embrittlement, which is also stress corrosion fracture; (3) plastic fracture. Plastic fracture is caused by overload fracture and impact fracture, which is a common form of deterioration of equipment parts. Before the machine breaks, plastic deformation may occur first, and then break, which is called plastic fracture; (4) brittle fracture. In the above situation, sometimes there is no obvious plastic deformation of the machine parts, and fracture occurs. This kind of fracture is called brittle fracture.
4. Aging fracture
The comprehensive effect of the above-mentioned various degradation factors, as well as the aging of circuit components and the aging of plastic and rubber parts, cause the degradation caused by the aging of equipment performance.
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