printing equipment3

② General knowledge of mechanical maintenance

Mechanical faults can generally be divided into accidental faults and natural faults. Accidental faults are mostly caused by improper maintenance or adjustment and violation of operating procedures, which should be avoided as far as possible. Although natural faults are difficult to avoid, they can prolong the effective working time of the machinery by improving the level of use and maintenance.

There are three main failure modes of mechanical parts: fracture, deformation and surface failure. The following describes the wear, deformation, cleaning methods and folding and disassembly assembly of printing mechanical parts.

a) Wear of printing machine parts

During the working process of the machine, if the relative moving part surface changes size? Changes in shape and surface quality are called wear.

The main causes of parts wear are friction and molecular gravity. Wear can be divided into abrasive wear, mechanical friction wear and adhesive wear. The reasons affecting the wear of mechanical parts are generally: speed, pressure, lubrication, temperature, material, processing and coordination, etc.

b) Deformation of printing machinery parts

In the process of maintenance, wear is one of the main factors of mechanical damage, but the micro deformation of parts is easy to be ignored. Often after the repaired worn parts are assembled, the technical performance of the machine can not meet the requirements. This is related to metal deformation. In actual production, the deformation of basic parts should be paid special attention, because if the basic parts are deformed, it will affect the relationship of all parts assembled on the basic parts and the mechanical properties of the mechanism. Therefore, in the process of parts repair, it is necessary to check not only the wear of the mating surface, but also the mutual position accuracy of parts (especially basic parts)? For the mechanical deformation after the first overhaul, be sure to pay attention to whether it is deformed after 12 ~ 20 months under the action of internal stress. For hot processed parts, corresponding measures shall be taken to remove internal stress.