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Explain in detail the reflow soldering

Time:2014-06-26Source:This siteViews:752

Abstract:
A detailed explanation of the structure of reflow soldering

System overview
Also called "reflow reflow" or "reflow soldering machine" (Reflow Machine), it is by providing a heating environment, the solder paste is heated to melt so that the surface mount components and PCB pad through the solder paste alloy reliably combined equipment. According to the technical development is divided into: vapor phase reflow, infrared reflow, far infrared reflow, infrared heating wind reflow soldering and reflow soldering. According to the welding of special need, reflow furnace containing nitrogen. At present more popular and useful mostly far infrared reflow, infrared heating wind reflow soldering and reflow soldering. According to the shape can be divided into desktop reflow furnace and vertical reflow oven, a brief introduction of these two.
1, desktop reflow oven
The desktop device suitable for medium and small quantities of PCB assembly, stable performance, price economy (between 4-8 million RMB about), domestic private enterprises and some state-owned units with the more.
2, vertical reflow oven
Vertical production models are more suitable for different needs of users, the PCB assembly. Equipment of high middle and low there, performance is relatively small, the price is ranging from low to high (between 8-80 million RMB about). The foreign, domestic research, with many well-known enterprises. The reflow solution is Guangdong a equipment limited by nitrogen EVOC "EVOC" construction of computer and automation system composed of IPC + SSR protection lead-free EP series hot air desktop reflow machine. Small circular design unique use of the system, so that the hot air circulation heating independent of each temperature zone. Computer analysis of the database, can store all customer data, and temperature curves of different, so that the temperature setting data for reference, can realize automatic detection function, can automatically detect the chain operation, and ultra high temperature alarm function. After running the test that the system is stable and reliable, users get the praise; the system can also be applied in the industrial process control field.

System structure
1, the system requires a control center

Function:
The monitoring work the reflow soldering machine.
The set and control the operation of conventional.
◆ to perform administrative functions, is responsible for all the work scheduling, allocation, arrangement, make its good operation.
2, the whole system task
◆ routine or monitoring function of predetermined; such as: temperature detection, adjustment and control, the transmission speed, the direction of the detection and control function.
◆ automatic detection function, can automatically ultra high temperature alarm function.
◆ directly and quickly to control and analysis functions.
The system adopts double for temperature, decreasing PCB plate bending deion, the control accuracy of high temperature requirements.
The main demand, system 3
The switch quantity input channel feedback (signal)
The switch quantity output channel (SSR)
The serial output control (control transmission belt speed)
The analog output (to control hot machine, to achieve temperature control)
The analog input (thermocouple signal input)

System design
In order to realize all the functions, and hope to get the whole control system of high reliability, high stability, strong anti-interference ability of comprehensive effect, ultimately chose the EVOC company "EVOC" special computer automated board, composed of IPC + SSR system, realize the control of the reflow temperature detection and control, mechanical transmission direction and speed control, temperature alarm, N2 concentration detection parameters. The system structure diagram of the whole system as shown below:
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