With the maturity of reflow soldering technology and the improvement of the grades of products produced by domestic EMS manufacturers, wave soldering equipment is still very promising. At present, due to the imperfection of reflow soldering technology and process, the defects of selective reflow soldering are still quite a few. In this paper, selective reflow is taken as an example to introduce and analyze selective soldering from two aspects of equipment and process. The equipment describes the main components of the machine. The reflow process introduces the process of selective soldering. Finally, several defects that are most likely to occur during selective wave soldering are analyzed. Reflow special wind wheel design, wind speed is stable; each temperature zone adopts forced independent circulation, independent PID control, independent heating method, so that the furnace cavity temperature is accurate, uniform, large heat capacity; heating up quickly, from room temperature to working temperature ≤ 20MIN; The imported high-quality high-temperature high-speed motor has smooth operation, small reflow vibration and low noise; the furnace body adopts cylinder top lift and safety rod support (electrically selectable); chain,
Reflow soldering uses stepless speed change, imported power; special high-quality aluminum alloy guide rail, reflow soldering automatic refueling system; Chinese and English Windows operating system, powerful, easy to operate; routine or scheduled monitoring functions; such as: temperature detection, adjustment and Control, transmission speed, direction detection and control functions. Fully automatic detection function, reflow soldering can automatically super high temperature and low temperature sound and light alarm function. A square wave or sinusoidal magnetic trajectory signal with a certain wavelength after reflow soldering for a certain year. The magnetic head moves and reads the magnetic yoke on the magnetic scale, and is converted into an electrical signal input to the control circuit to finally control the operation of the AC servo motor.
The advantages of reflow soldering are simple manufacturing, convenient installation, high stability, large measuring range, measurement accuracy of up to 1~5um, and patching accuracy of 0.02mm. This kind of measurement is to be tens of millions of times to achieve the best reflow positioning accuracy is 1 to 2 orders of magnitude higher than the magnetic scale. When the turret structure is in motion, the placement speed is limited due to the limited maximum allowable radial acceleration on the vacuum nozzle. Direct and fast control and analysis functions. The reflow soldering system adopts double-sided heating technology to reduce the bending deformation of the PCB and requires high temperature control accuracy. Input channel of signal feedback (signal acquisition), output channel of reflow soldering switch (control SSR), serial output control inverter (control speed of transmission belt), analog output (control hot air blower, temperature control) Analog input (thermocouple signal input)
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