The wire harness is a wiring component for connecting various electrical equipment in the circuit, and is composed of an insulating sheath, a terminal, a wire, and an insulating wrapping material. The quality and service life of the wire harness are closely related to the selection of the wire harness material, so when selecting the wire harness material, it is certain Be cautious and take good quality first from the source. Wuxi wire harness factory analysis, the factors affecting the quality of the wire harness usually include wires, terminals, plastic shells and others.
First, the choice of wire
According to the different environments, choose the appropriate wire. For example, the ambient temperature of the car engine is high, and there are many corrosive gases and liquids. Therefore, it is necessary to use high temperature, oil, vibration and friction resistant wires; wire on the automatic transmission. Must be resistant to high temperature and hydraulic oil, and its temperature stability should be good; weak signal sensors should use shielded wires, such as crank position sensor and knock sensor, ABS wheel speed sensor, etc.; the inner wire of the door should be made of wire with high bending resistance.
Second, the choice of plastic shell
The commonly used materials for plastic parts mainly include PA6, PA66, ABS, PBT, pp, etc. When designing the plug-in, different materials can be selected according to different needs, and flame retardant or reinforcing materials can be added to the plastic according to the actual situation to achieve reinforcement or The purpose of flame retardant, such as adding glass fiber reinforcement.
Third, the material selection of the terminal
The terminal materials are mainly brass and bronze (the hardness of brass is slightly lower than that of bronze), and brass accounts for a large proportion. In addition, different coatings can be selected according to different needs, such as tin plating, gold plating, and the like.
Fourth, the choice of other accessories
Wire harness accessories play the role of abrasion resistance, flame retardant, anti-corrosion, anti-interference, noise reduction, and beautification of appearance. Generally, auxiliary materials are selected according to the working environment and space. Excipients usually have the following types:
1, tape
The wiring harness is made of PVC tape, acetate tape, insulating tape, conductive tape, copper foil, and the like. The tape acts as a bundle, insulation, conductive, marking, etc. in the wire bundle. Different tape label materials can be selected according to different needs.
2, casing class
The casings are PVC pipe, glass fiber tube, silicone tube, heat shrinkable tube, spiral tube, etc., which play the role of flame retardant, insulation and protection. PVC pipe has good flexibility and bending resistance.
3, tin materials
The amount of tin in the wire bundle is also relatively large. The tin material has lead-free tin bars, tin bars containing silver, tin wire, etc., and is mainly used for immersion tin and welding at the end of the wire. It can be selected according to the purpose.
4, hardware head class
The hardware head is mainly used for injection molded parts. The hardware head has DC head, BNC head, stereo head, DB head, USB head, DIN head and RCA head. The hardware head also needs to select the model specifications and materials and plating according to different usage environments.
5, rubber materials
The rubber compound is also used for injection molded parts. The commonly used rubber compounds are 45P, 60P, etc., which are different in hardness and hardness, and are selected according to needs, and different colors are also selected.
6, packaging materials
There are other packaging materials, such as cable ties, end tapes, PE bags, cartons, aprons, etc., which are also selected according to packaging requirements.