Characteristics of Lead-free Reflow Soldering Machine
● Closed-loop control system for warm air volume
The warm air volume in the upper and lower temperature zones is controlled by variable frequency closed-loop. The system for checking and managing the pressure of warm air in each temperature zone controls the volume of warm air there as required by the technics of lead-free soldering.
● Combined warm air ＋ far infrared heating system
Combined warm air ＋ far infrared heating has lower air velocity while providing the same amount of heat. It prevents the small parts from moving, reduces the cost of operation by lowering the consumption of nitrogen, and allows high-quality soldering of both the high-density and flexible base plates. The far infrared electromagnetic wave is able to reduce the pollution of furnace chamber, heater and fan impeller by decomposing the resin in the soldering flux. ——Patent No. ZL200420042200.5
● Unique ω warm air circulation
ω Warm air Circulation has been proved to achieve more balanced and distinct parallel distribution of temperature zones with little interruption among them.
● Independent device for filtering soldering flux and purifying air for each temperature zone ( nitrogen-filling type)
In the nitrogen protection type reflow soldering machine, the independent device for filtering soldering flux and purifying air is adopted for each temperature zone to reduce the volatilization of soldering flux and help the waste gas produced by PCB and other gasified wastes to fully discharge without causing the loss of nitrogen. Besides, the volatile soldering flux will not enter the cooling area or accumulate on the chamber or the PCB, preventing breakdown of the machine or loss that would otherwise be caused by soldering flux pollution.
● Self-diagnosis function of the heater
The self-diagnosis function of the heater incorporated in the controlling system of reflow soldering machine can test the status of the heater and timely give the alarm so as to prevent the fluctuation of temperatures as a result of damage of heater and ensure the quality of soldering.
● Stable Conveying System
When cooling the lead-free soldering joint, there forms a temperature zone instead of a eutectic point as in the case of capsule metal. During transportation, the shocking may affect the crystallization of soldering points. But the conveying chain wheel with smaller radius allows smooth transportation of small PCB.
● Nitrogen-filling System with Low Nitrogen Consumption
Combined warm air ＋ far infrared heating, small amount of warm air and independent device for filtering solder flux and purifying air combine to substantially lower the consumption of nitrogen, thus reducing cost of operation.
● Parallel Distribution of Temperatures in the Soldering Zones
Parallel distribution of temperatures is a major technical index for judging the quality of the reflow soldering machine. The temperature sensor group installed in the soldering zone can test the temperature of each point at any time and the parallel distribution is displayed on the computer screen. And alarm will be given if there is a fault.
