In China, the universal fence terminal standard is GB14048.7 / 8. Material selection: the performance of the material directly affect the performance of the entire product is the key to the design. Take the generic PA66 as an example, which is the most widely used plastic material for most manufacturers. Fence-type terminal material is better to meet the UL94, V-0 flame retardant grade, high Lin is used as a plastic material. At this time the design of CTI parameters must meet the requirements, a direct impact on the final product can withstand the impact of voltage and anti-aging test and other tests.
Fence-type terminals in the metal materials, to have the conduction current and must be flexible parts, such as the terminal block, the material directly affects the electrical properties of the terminal and the connection performance, because the material conductivity Directly affect the temperature rise and contact resistance, the elasticity of the material and chemical elements, elastic modulus, hardness, tensile strength, the greater the electrical conductivity of the contact resistance is the smaller the temperature rise, the insertion force And the contact resistance into a quadratic relationship. Product standards: Terminals are the category of connectors, so in the design of wiring terminals to refer to IEC, UL, CSA, VDE, TU, GB and other international and domestic electrical connection standards, but also refer to some industry standards, such as JB, GJB Wait.
In accordance with UL regulations, the fence terminal can be used not more than 25% of the material with 75% of the new material together after mixing and mixing, especially for some high current and high voltage products, the use of materials should be Lower or not. Fence-type terminals in the plating, the coating layer also directly affect the main factors of the connector life. In terms of gold plating and silver plating, the conductivity of silver is higher than that of gold, but its chemical stability is not good, and the film resistance is much larger than that of gold plating. But the high cost of gold plating, only recommend the use of acidic environment or worse application of the environment before the use of gold plating, but also on the contact with the local use of gold plating, so that both improve the use of performance, product costs are greatly reduced. Product structure: such as screw off, stitching products before and after the arc, long-term deformation, uneven wall thickness caused by shrinking deformation.
Fence-type terminal screws to prevent the current number of the following: three bars off, hoop mouth off, neck anti-off, stamping off, due to the impact of technical processes at present, The majority of the use of the neck to prevent the stall product portfolio growth number of deformation problems, the main reason is due to structural unreasonable lead to two falcons in the front and rear left and right forces imbalance, shown in the fence terminal design Consider the force and deformation direction of the pest Falcon. The insertion and tearing force of the plug-in terminal is related to the material, plating, structure and the applied industry, and is an important mechanical performance requirement of the connector industry. Plug force to be smooth, contact resistance is small, to be able to meet a certain degree of life and fatigue, so the requirements of the hardware shrapnel material is higher. For high-performance terminals, the industry is the use of imported phosphorous copper and other high-conductivity high elastic material.