The terminal is connected to one of the basic components in the power, plays an important role in the electrical connection, terminal design is one of the important factors to decide the terminal quality, some basic general principles to consider when design terminal brief introduction.
1, product standards: terminal belongs to the category of connector, so in the design of terminal to the reference IEC, UL, CSA, VDE, TU, GB and other domestic and international standards for electrical connection, also want to refer to some industry standards, such as JB, GJB etc.. In China, terminal standard is GB14048.7/8.
2, the choice of materials: materials performance directly affects the performance of the whole product, is the key of the design. By using PA66 as an example, this is the plastic material used in most manufacturers choose to use the most. The material is relatively well with UL94, V-0 flame retardant, at design time CTI parameter must meet the requirements, directly affect the final product will pass the impulse withstand voltage and aging test. In accordance with the provisions of UL, you can use the new material is not higher than 25% of the feed back and 75% with the full mixing use, especially to some endurance of high current and high voltage products, feed back the use of should be lower or not filled.
In metal materials, to have the conduction current and to be flexible components, such as tablet terminals, material quality can directly affect the electrical performance of terminal and connection properties, because the material conductivity directly affects the temperature and contact resistance, good or bad about the chemical elements, and the elastic modulus of elasticity, hardness, tensile strength, the greater the contact resistance of the material conductivity is smaller temperature rise is low, the relationship between the insertion force and contact resistance two times curve.
In electroplating, plating film layer is also directly the main factors influencing the connector service life. On the gold and silver plated, silver conductive rate higher than gold, but its chemical stability, no gold, film resistance caused far greater than gold. But the gold plating of high cost, only recommended and acid environment or more harsh application environment products that use electric gold, but also for the tabletting contact parts adopt local gold plated, this can not only ensure the use of performance is improved, the product cost is greatly reduced.
3, the product structure: such as before and after splicing screw anti dropping, products with curved, long digit deformation, wall thickness caused by uneven shrinkage deformation. Screw down proof at present are the following: three ribs falling proof, anti off the hoop mouth, neck anti dropping, stamping the anti dropping, influenced by the technology currently neck anti dropping by is not much, and most use neck drop proof, deformation problem of splicing products combination growth figures, the main the reason is due to the unreasonable structure caused two splicing Falcon in and up and down force balance, shown in the structure design to the splicing Falcon force and deformation direction into account. Relations have pluggable terminal insertion force and materials, electroplating, structure and application of the industry, is the requirement of the connector industry an important mechanical properties. Force should be smooth, contact resistance to be small, to meet a certain life and fatigue degree, so the higher demands on the metal shrapnel material. Terminal on the high performance, the industry is imported copper high conductivity and high elastic material.
4, die: terminal main surface mainly in the plastic mould and hardware mainly die. The quality of mold design and manufacture of the impact on the terminal parts of the great. In addition to providing a standard products, but also need to have a professional R & D team to provide ODM/OEM service for customers, effectively solve the electric customer proposed connection terminals, connectors and other products, personalized solutions.
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