Selection and technology of Electrical terminals blocks:
The choice of terminal material directly affects the performance of the entire product and is the key to the product. Take insulating materials as an example: if the design standard is UL94, V-0 flame retardant, it is necessary to carefully review whether the physical technical parameters of the material can be To meet the requirements of the product, such as the impact withstand voltage and whether the test meets the standard, in terms of hardware materials, the selection of the tablet material is particularly important, because the tablet must meet both the electrical conductivity (current) and the elasticity. It brings difficulties to our engineers, and it is precisely in this regard that connector manufacturers are pursuing the trend of elastic components. Many companies that produce hardware materials are experimenting in this regard. Conductivity directly affects conductor temperature rise and contact resistance. , The quality of elasticity is related to the chemical elements, elastic modulus, hardness and tensile strength of the material. The selection of elastic modulus is calculated by the fourth strength theory formula of material mechanics. The greater the conductivity of the material, the smaller the contact resistance and the lower the temperature rise. The contact resistance is mainly divided into: compression resistance, film resistance, and volume resistance (resistance of the conductor itself).

In conventional requirements, companies often choose copper as the raw material for terminal contacts, and nickel or zinc as the coating metal; although it should be silver-plated or gold-plated in terms of conductivity and performance, it is unacceptable to mass users in the market and consumption. The high price, so at this stage, the whole industry still chooses copper nickel plating or zinc plating.
In the terminal industry, it is often seen that there are many burrs on the insulating parts of the product, the color is uneven, and the appearance is even a little deformed. In the internal structure of the product, there are often problems such as the screw falling off before the product is installed, and the poor electrical conductivity of the metal parts.

The design of the structure and performance of the terminal block is very important. It is the accumulation of experience and technology. There is no way to imitate or copy it. In this regard, each series has its own characteristics, such as: the screw is prevented from falling off, and the spliced ​​product has an arc in the front and back. There are several ways to prevent the screw from falling off: three ribs, hoop mouth, neck mouth, stamping, etc. The impact of the process At present, there are not many ways to prevent the neck from falling out, and most of them use the neck to prevent it. The realization of the above structure is based on the precondition that the plastic material is PA66. For example, the actual outer diameter of the M3 screw is φ2.90mm, so the size of the shell neck should be designed as: φ2.5～φ2.6, the thickness of the shell neck should be 0.4～0.5mm, and the screw head should be There is a section of polished rod smaller than the neck of the shell, so that the screw can be screwed into the thread smoothly, and the production process should also be adjusted accordingly.