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A great explanation of the production process of terminal terminals

  • DATE:2018/4/14 15:38:08

A great explanation of the production process of terminal terminals


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Basic knowledge of terminal electroplating
Electroplating is a process of metal electrodeposition, which means that simple metal ions or collaterals are discharged by electrochemical methods to the surface of a metal atom on the surface of the electrode to obtain a metal layer. The purpose is to change the surface characteristics of the solid to change the appearance, improve the corrosion resistance, wear resistance, enhance the hardness, and provide special surface properties of light, electricity, magnetism and heat.
Most electronic connectors and terminals must be surface treated, usually referring to electroplating. There are two main reasons: (1) protecting terminal reed base material from corrosion; (2) optimizing terminal surface performance, establishing and maintaining contact interface between terminals, especially membrane control.

Two. Factors affecting the selection of terminal terminals
1. power processing factors
Simply reading the data handbook does not guarantee that accurate comparative data can be obtained. Engineers must know how the product performance data listed in the manual are tested and determined.
At present, UL, IEC, CSA and DIN have no uniform standard in determining the power and performance specifications of terminal products. The user needs to understand the differences between the UL and the IEC specifications. The differences between the two standards are very large. Engineers who do not know the method of product specification take a lot of risk, because the selected devices may not reach the desired level of power, or the specifications of the selected devices exceed the design requirements. In Europe, the current rating of the device is determined by monitoring the temperature of the metal conductor when the current is increased. When the temperature of the metal pin is 45 degrees higher than the ambient temperature, the measured current is used as the rated current value (or maximum current value) of the device. Another specification of IEC is the allowable current value, which is 80% of the maximum current. Different from this, the UL standard will make the temperature of metal conductor higher than the ambient temperature by 30 degrees. When the current value is 90%, it will be the current nominal value of the device. It can be seen that the temperature of the metal conductor part is a very important factor in all applications. It's more important for industrial equipment. Because industrial equipment usually needs to work in the environment with a temperature of up to 80 degrees. If the temperature of the terminal is 30 or 45 degrees higher than the temperature, the temperature of the terminal will exceed 100 degrees. According to the nominal value type and insulating material used by the selected device, the product must work at a current below the rated value so as to ensure that they can work reliably within the desired temperature range.
Another factor that is often ignored when selecting devices is the terminating technology used by the products. Most of the power supply terminal products are still using through-hole connection mode. This method can provide the needed mechanical support, and guarantee the solid electrical contact with the power layer embedded in the multilayer circuit board. There are many different types of pins used to connect terminals to circuit boards.
2. appearance factors
Many companies believe that it plays an important role in product appearance and user affinity. The power terminals must be conveniently installed on the spot, as they are often installed on the front end of the panel that is easy to see. In this way, marketers often want to have a say in the appearance of the power terminals. But this is often the case: the engineer's product meets all mechanical and electrical parameters, but has to change because it does not meet the requirements of the sales. In many industrial control systems, wiring terminals are often one of the few components that technicians need to pay special attention to. Though its user interface is relatively simple, it is very important for the normal operation of the device.
When wiring terminals are used in consumer products, appearance becomes more and more important. In fact, some designers often specify gold-plated processing for terminal devices used for audio devices, which increases the cost and does not significantly improve performance, but gilding does improve the appearance of the product.
It is also a key part of system design to understand the measurement method of the parameters of the power supply terminals. Confirm that the selected power supply terminals meet the power supply device's temperature range, current and voltage requirements, which helps to ensure long-term reliability of the system. In addition, if the selected power terminal device adopts the wiring technology that meets the requirements of the market and ensures the convenience of the user in the design, the success probability of the final product will be improved.

Three. Common terminology for connectors
1. connector: a detachable element usually connected to a cable or equipment to connect electrically to the transmission line system.
2. RF connector: it is a connector used in the radio frequency range.
Video: 3. in the frequency range between 3HZ to 30MHZ radio.
4.: radio frequency in the frequency range between 3 thousand HZ ~ 3000GHZ radio.
5.: high frequency in the frequency range between 3MHZ to 30MHZ radio.
6. coaxial: the inner conductor has a dielectric support, and the structure can get the minimum internal reflection coefficient in the frequency range.
7. triaxial transmission line consisting of three concentric conductor by having a common axis and the mutual insulating.
The 8. level: connector in mechanical and electrical precision, especially in the specified reflection coefficient level.
9. general purpose connector (Level 2): the connector is made by the widest tolerable size deviation, but it can guarantee minimum performance and compatibility.
10. high performance connector (Level 1): a connector that stipulates the limit value of reflection coefficient according to the frequency change. Usually, the size tolerance is not specified.


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