What are the three bad conditions of insulation and conductivity of terminals?

I . Terminal insulation and conductivity of the three bad situations? Terminals from the use of point of view, should achieve the function is: the contact part of the place where the conductive must be conductive, reliable contact. Insulated parts should not conductive place must be insulated reliably. Terminal common fatal failure in the form of the following three: 1. poor insulation insulator's role is to make contact with the correct position of the arrangement, and so that the contact with the contact between the contact, contact with the shell of mutual insulation. Therefore, the insulator must have excellent electrical properties, mechanical properties and process molding performance. Especially with the high-density, miniaturized terminals are widely used, the effective wall thickness of the insulator is getting thinner and thinner. This insulating materials, injection mold precision and molding process put forward more stringent requirements. Due to the insulator surface or internal metal excess, surface dust, flux and other pollution moisture, organic material precipitates and harmful gases adsorption film and the surface of the water film fusion to form ionic conductive channel, moisture absorption, mold, aging of insulating materials, etc., will cause short-circuiting, leakage, breakdown, low insulation resistance and other insulation defects.2. Poor contact with the metal conductor inside the terminal is the core parts of the terminal It will come from the external wire or cable voltage, current or signal transmission to its matching connector corresponding to the contact parts. Therefore, the contact must have excellent structure, stable and reliable contact holding force and good electrical conductivity. As a result of the structural design of the contact parts is not reasonable, the material selection error, mold instability, processing size is too poor, surface roughness, heat treatment plating and other surface treatment process is not reasonable, assembly is not appropriate, the storage and use of harsh environments and improper use of the operation will be in the contact parts of the contact parts and with the parts caused by poor contact. 3. poorly fixed insulator not only plays the role of insulation, usually also for the outstretched contacts to provide the centering And protection, but also has the installation of positioning, locking fixed in the equipment function. Fixed poorly, the light impact on the contact reliability caused by instantaneous power failure, serious is the disintegration of the product. Disintegration refers to the terminals in the state of insertion, due to materials, design, technology and other reasons leading to unreliable structure caused by the plug and socket between the pins and jacks of the abnormal separation, will cause the control system power transmission and signal control interruption of the serious consequences. Due to unreliable design, wrong material selection, improper selection of molding process, poor quality of heat treatment, molds, assembly, fusion welding and other processes, assembly is not in place, etc. will result in poor fixation.

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