Automotive wiring harness is the main body of the car circuit, there is no wiring harness there is no car circuit. Harness is made of copper by the contact with the terminal (connector) and wire and cable crimp, outside the plastic pressure insulator or external metal shell, etc., to bundle the formation of connecting circuit wiring components. The car harness is functionally divided into two types of power lines that carry the drive actuator actuators (actuators) and the signal lines that carry the sensor input commands. As people continue to improve comfort, economy and security requirements, the variety of electronic products on the car is increasing, and the wiring harness is becoming more and more complicated. The failure rate of the harness is also increased.
Automotive wire, also known as low-voltage wire, it is not the same as ordinary household wires. Ordinary household wire is copper single core wire, a certain hardness. The car wires are copper multi-core cord, some soft lines like hair, a few or even dozens of soft copper wire wrapped in plastic insulated tube (PVC), soft and not easy to break.
With the increase in the function of the car, the universal application of electronic control technology, more and more electrical parts, wires will be more and more, the wiring harness will become more rough and heavier. So the advanced car on the introduction of the CAN bus configuration, the use of multi-channel transmission system. Compared with the traditional wiring harness, multi-way transmission device greatly reduces the number of wires and connectors, wiring easier.
Automotive wiring harness commonly used specifications with a nominal cross-sectional area of 0.5,0.75,1.0,1.5,2.0,2.5,4.0,6.0 square millimeter of the wire (Japanese cars commonly used in the nominal cross-sectional area of 0.5,0.85,1.25,2.0 , 2.5, 4.0, 6.0 and other square millimeters), each of which has a allowable load current value, and is used for wires of different power equipment. The specification line applies to the lamp, front and rear lights, brake lights, etc .; 1.0 specification line for turning lights, fog Lights, etc .; 1.5 specifications for headlights, speakers, etc .; main power lines such as generator armature line, ground wire and other requirements 2.5 to 4 square millimeters of wire. This is only refers to the general car, the key depends on the maximum load current value, such as battery grounding line, the positive power cord is a special car wire alone, their diameter is relatively large, at least a dozen square millimeters Above, these "giant" wire will not be included in the main harness.
With the improvement of comfort, economy and safety requirements, the variety of electronic products on the automobile is increasing, and the failure rate of automobile wiring harness is more and more complicated. Which requires improved wiring harness reliability and durability and other properties, many people for the automotive wiring harness process and production are more interested in here Haizhi Electronics on the car harness process and production of this knowledge to be a simple description, you only need Take a few minutes to read, you can generally understand.
In the automotive wiring harness two-dimensional product drawings come out, to arrange the wiring harness production process, the process is to serve the production of the two are inseparable, so I will car harness production and technology together to analyze the two together.
The first station of the wire harness is the open process. The accuracy of the process is directly related to the entire production schedule, in the event of errors, especially the open line size is short, will lead to all the station rework, time and effort to affect production efficiency. So in the preparation of the opening process is sure to be based on the requirements of the drawings to determine the wire size of the wire, the size of the head.
After the opening of the second station is the crimping process, according to the type of drawings required to determine the crimp parameters, the production of crimp operation instructions, for the special requirements of the need to specify the process documents and training operators. For example: some wires need to wear through the jacket before crimping, it needs to first pre-installed wire and then returned from the pre-installed station and then crimp; there are puncture crimping with a dedicated crimping tool, which Kind of crimping method has good electrical contact performance.
Then is the pre-installed process, and first of all to prepare the pre-installed process operating instructions, in order to improve the efficiency of the assembly, complex wiring harness must be set pre-installed, pre-installed process is reasonable or not directly affect the efficiency of the total assembly also reflects a Technical level of technical staff. If the pre-installed part of the assembly of the assembly line or assembly of the wire path is unreasonable will increase the total assembly staff workload, slow down the speed of the assembly line so the process staff to stay in the scene often sum up.
The last step is the assembly process. Can be compiled according to the product development department design of the platen, design tooling equipment, material box size and all the assembly sheath and accessories number affixed to the material box to improve the assembly efficiency. The preparation of each station assembly content and requirements, balance the entire assembly station to prevent the occurrence of a little workload is too large, pull down the entire assembly line speed situation. To achieve the balance of the station, the process staff must be familiar with each operation and on-site measurement of working hours, at any time to adjust the assembly process.
In addition, the wiring harness process also includes the preparation of material consumption quota schedule, man-hour calculation, worker training, etc., because the technical content value is not high, these are not elaborate. All in all, the automotive wiring harness in the car electronic technology content and quality, has gradually become an important indicator of vehicle performance evaluation. Car manufacturers for the choice of wiring harness should pay special attention, it is necessary to understand the next car wiring harness technology and production.