What Is a Preventive Maintenance Program?

Preventive maintenance. Measures developed to eliminate the causes of equipment failures and unplanned outages as an output of the manufacturing process design. From the standpoint of preventive medicine, early detection and early treatment of abnormalities of the device.

The so-called PM is an acronym for Preventive Maintenance and Productive Maintenance. It is defined in the PM terminology of the Japan Equipment Engineering Association as follows.

Preventive maintenance is the initial stage when preventive maintenance is introduced into China from abroad: it is counted as PM.

Preventive maintenance is the purpose of preventing failures. Through the inspection and detection of equipment, we can detect the symptoms of failures or prevent the failures from happening and keep them in a prescribed functional state. Various maintenance activities are performed before the failures occur. Preventive maintenance is an effective means to prevent equipment failures, and it has become a maintenance method commonly used by modern manufacturing enterprises. Typical preventive maintenance includes planned maintenance, reliability-centric maintenance, etc. ^[1]

Throughout the maintenance history of the equipment, the maintenance methods of the equipment can generally be summarized into three types: after-the-fact maintenance, preventive maintenance and improvement maintenance.

Among them, the word PM was first introduced into China in 1951, the so-called post-war. At that time, it was rebuilt from the ruins

Recently, not only large-scale enterprises, but also small and medium-sized enterprises have also switched from manual operations to mechanization. As a result, not only has the equipment increased, but they have also rapidly developed toward complexity, advanced, large-scale, and automated development. For each manufacturing process production plan, delivery time, quality,

1. Increase the failure rate of problematic components. In other words, the component failure rate increases, which means wear and tear and preventive maintenance of the component. However, if the failure rate of a component is too high (expressed through an exponential distribution), then preventive maintenance is meaningless.

2. The total cost of performing preventive maintenance activities is lower than the total cost of repair-type maintenance. Pay attention to the cost of repair-type maintenance, including visible and invisible costs, such as loss of downtime, lost production time, lost credibility, etc. If these two conditions are met, preventive maintenance makes sense. In addition, based on the cost ratio, the optimal time for preventive maintenance of a single part can be calculated by a computer ^[2] .