Terminal blocks of plastic insulation materials and conductive parts directly related to the quality of terminals, which determines the terminal's insulation properties and conductivity. Any one terminal will cause failure of the entire system. Said prevention is the goal, analysis is based. Instrument World Network noted that, from a certain perspective, should achieve the function of terminals are: access to parts of conduction must be conduction, reliable contacts. Insulated gripping surfaces should not be reliable leads must be insulated.

 

Common fault of terminals forms have the following three types:

 

1. poor contact

 

The metal conductors inside the terminal are core parts of the Terminal, it will come from external wires or cables for voltage, current or signaling to the matching connector on the corresponding contacts. Contacts must have good structure, stable, reliable retention of engagement and good electrical conductivity. Due to the unreasonable structure design of contacts, materials selection error, die instability, processing size variance, surface roughness, surface treatment electroplating technology of heat treatment is unreasonable, improper Assembly, improper storage conditions and use, tie parts and contacts all contacts cause poor contact.

 

2. poor insulation

 

Insulation's role is to maintain the correct placement of contacts and between contacts and contacts, contacts between shell and insulation. Must possess excellent electrical properties of the insulation, mechanical and process performance. Especially with the high density, the widespread use of miniaturized Terminal, effectively getting thinner wall thickness of the insulation. On insulation materials, plastic precision molds and molding process, such as more stringent requirements. As the insulator surface or inside metal surplus of surface dust, flux and other pollution gets wet, organic material precipitates and hazardous gas adsorption film and surface water membrane fusion to form Ionic conductive channel, absorb moisture, mold, insulation aging and other reasons, would cause a short circuit and leakage current, breakdown, poor insulation and low insulation resistance phenomenon.

 

3. poor fixed

 

Insulator not only insulated, usually outstretched provides precise alignment and protection of contacts, as well as installation, lock function holding device. Fixed bad effect light, reliable contacts cause transient power outages, severe disintegration of the product. Disintegration refers to the terminals in the plug-in-State, because the material, design, process cause structure caused by unreliable between plug and socket, normal separation between pin jacks, energy transmission and signal control system control interrupt caused serious consequences. Due to unreliable design, material errors, forming improper heat treatment, mold, assembling, welding techniques such as poor quality, fixed adverse assemblies are not in place.

 

In addition, due to the peeling of the coating, corrosion, scratches, and molded edge, cracked, rough processing of contacts, deformation caused by poor appearance, due to positioning and locking with the size variance, process quality consistency is poor, total separation force exchanged as a result of malnutrition, disease, and frequently-occurring. These types of faults can usually be found in the testing and use of the process in a timely manner either.

 

There is no reliable terminals, there is no secure systems engineering. Corresponds to failure and reliability is a contradictory body of two aspects of the linkages. By Terminal reliability screening to find various failure modes and failure mechanisms, lessons learned and eliminate pitfalls that can lead to a lot of, to improve the product design, engineering, testing and using scientific evidence, it is also important to revise and develop specifications for Terminal basis. Looking for measures to prevent failure to achieve transformation from failure into a reliable, is the ultimate objective of failure analysis.