Research on injection molding performance or state has gradually declined over time. There are some signs before a fault occurs. This is called a latent fault. The identifiable physical parameters indicate that a functional fault is about to occur. The functional fault indicates that the vertical injection molding machine has lost the specified performance standards.

The variation of the failure rate of vertical injection molding machines with time is often called the bathtub curve. The failure rate of the vertical injection molding machine varies with time in three stages: early failure period, accidental failure period and wear failure period.

Early failure period

Vertical injection molding machines are in an early failure period, and the failure rate is high, but the failure rate decreases rapidly with time. The early failure period is also called the running-in period for mechanical products. This period of time is different, depending on the design and manufacturing quality of the product and system. The failures that occurred during this period were mainly caused by defects in design and manufacturing, or caused by improper use of the environment.

2. Incidental failure period

When the vertical injection molding machine enters an accidental failure period, the failure rate is roughly in a stable state and tends to be fixed. During this time, the failure occurred randomly. During the accidental failure period, the vertical injection molding machine has the lowest failure rate and is stable. Therefore, it can be said that this is the best state of the vertical injection molding machine or the normal working period. This section is called the effective lifetime.

The failure of the accidental failure period is caused by improper design, improper use and poor maintenance. Therefore, by improving the design quality, improving the use of governance, strengthening monitoring and maintenance, and maintenance, the failure rate can be reduced to a minimum.

3. Loss failure period

In the later stages of vertical injection molding, the failure rate began to rise. This is due to wear, fatigue, aging, corrosion, etc. of the vertical injection molding machine parts. If the inflection point is overhauled at the beginning of the wear and tear period, the failure rate can be reduced economically and effectively.

The three stages of the failure rate curve of the vertical injection molding machine truly reflect the regularity of the vertical injection molding machine from running-in, commissioning, normal operation to overhaul or scrap failure rate, and strengthen the daily management and maintenance of the vertical injection molding machine. The sporadic failure period can be extended. Properly finding the inflection point can avoid excessive repair or repair coverage to achieve the best investment benefits.