Reflow machine4/16/2023 ![]() Preheat – During this phase the components, PCB and solder are all heated to a specified soak or dwell temperature being careful not to heat too quickly (usually no more than 2✬/second - check solder paste datasheet). The main aim being to transfer enough heat into the assembly to melt the solder and form the solder joints without causing any damage to components or PCB. Within a typical reflow soldering profile there are usually four stages – Preheat, soak, reflow and cooling. Ideally more thermocouples should be used to measure the full range of temperatures across the PCB – known as ‘Delta T’. It is recommended to have at least one thermocouple located on a pad towards the edge of the PCB and one thermocouple located on a pad towards the middle of the PCB. In order to create a reflow profile thermocouples are connected to a sample assembly (usually with high temperature solder) in a number of locations to measure the range of temperatures across the PCB. The calculation is for HEATED LENGTH – NOT OVERALL OVEN LENGTH. Note that the overall length of the oven will exceed 10 feet including the cooling section and conveyor loading sections. Oven heated length = 120 inches (10 feet) Therefore, the reflow oven must have a process speed of at least 30 inches per minute.ĭetermine oven chamber heated length with process speed equation: Load Factor = 0.8 (2-inch space between boards)Ĭalculate Line Speed: (3 boards/min) x (8 inches/board) How long an oven do I need to process boards at this throughput? The solder paste manufacturer recommends a 4 minute, three step profile. Process speed = Oven chamber heated lengthīelow is an example of calculation to establish the correct oven size:-Īn SMT assembler wants to produce 8-inch boards at a rate of 180 per hour. ![]() We prepare for your order in terms of the proforma invoice after confirming your full payment.Ĭ.To be able to select the correct size reflow oven the process speed (defined below) must be greater than the minimum calculated line speed. ![]() Make the payment according to the method put on proforma invoice.Į. Send you the proforma invoice and confirm your order.ĭ. Negotiate and confirm the final price, shipping, payment methods and other terms.Ĭ. Consult us about this product on line or by e-mail.ī. If it exceeds 0.5KG, you need to pay the postage.ġ set machine, mixed order is also welcomed.Ĥ) How can I buy this machine from you? ( Very easy and flexible !)Ī. If the part is less than 0.5KG, we pay the postage. If you still have any question, please contact us by e-mail / skype/ phone /trademanager online service.Ģ) If machine have any problem after I receive it, how can I do ?įree parts send to you in machine warranty period. There is English manual or guide video that show you how to use machine. Wechat whatsapp:+8613691605420, Skype: flasonsmt, Email: ġ) This is the first time I use this kind of machine, is it easy to operate? Flason Electronic Co.,ltd provide a full SMT assembly line solutions, includingĮtc any kind SMT machines you may need, please contact us for more information: SMT Reflow Oven, Nitrogen Reflow Oven, Dual Lane Reflow Oven, Vertical Reflow Oven, Vacuum SMT Reflow Oven, Lead free SMT Reflow Oven, Reflow Oven Manufacturer, LED Reflow Oven, China Reflow Oven. Low consumption of N2, 20-22 m³/H of N2 reflow in O2 content is 300-800PPM condition.ģ phase, 380V 50/60Hz (Optional: 3 phase, 220V 50/60Hz ) Strengthened main sweep keep rail no transverse deformation, no board stuck and dropped.Ĭhamber designed for fully protecting and closing to keep no leaving of N2, the lowest content of O2 can be 150ppm. Longer heating area makes higher production efficiency and throughput.ġ5% improvement of heat transfer efficient resolved more complicated and larger PCB lead-free technology.
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