Research injection molding machine function or state with the passage of time and gradually decline.Many failures before there will be some warning, which is the so-called potential failure, the physical parameters can be identified that a functional failure is imminent, functional failure that injection Machine lost the required performance standards.
Injection molding machine failure rate changes with time, often called bathtub curve. Injection molding machine failure rate over time roughly divided into three stages: early fault, accidental fault period and wear fault period.
1. Early failure period
In the early failure of injection molding machine, the failure rate is very high, but over time the failure rate dropped rapidly, the early failure period for the mechanical products, also known as the run-in period.
This period of time, due to product, system design and manufacturing quality vary. During this period, the failure occurred mainly due to design and manufacturing defects caused by improper use of the environment.
Occasional failure period
Injection molding machine into the accidental failure period, the failure rate is generally stable, tends to set value. During this period, the failure occurred is random.In the accidental failure period, the lowest failure rate of injection molding machine, and stable. , This is the best condition of the injection molding machine or normal working period.This section is called the effective life.
Accidental failure of the fault, many due to the design, improper use and poor maintenance, so by improving the quality of the design, improve the use of management, strengthen monitoring and diagnosis and maintenance work, the failure rate can be reduced to a minimum.
3. Loss of failure
The failure rate begins to increase later in the life of the injection molding machine due to wear, fatigue, aging, corrosion, etc. In the event of an overhaul at the inflection point, the beginning of the wear failure, the failure can be economically and effectively reduced rate.
Injection molding machine failure rate curve changes in three stages, a true reflection of the injection molding machine from run-in, commissioning, normal work to overhaul or scrap failure rate changes in the law to strengthen the daily management and maintenance of injection molding machines, can extend the accidental failure period. Accurately identify the inflection point, to avoid excess repair or repair to expand the scope in order to obtain the best investment returns.