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标题: DIY Pizza Reflow Soldering [打印本页]

作者: liyf    时间: 2012-1-8 09:52
标题: DIY Pizza Reflow Soldering
DIY Pizza Reflow SolderingThis tutorial explains how to reflow-solder PCBs in a standard pizza oven. The soldering profile as well as the initial instructions are from  Sergei Lupashin (ETH IDSC). This tutorial was written with delicate ICs like gyroscopes, accelemeters and magnetometers in mind. We had good success and zero failure so far with the temperature curves below.

Materials

CalibrationBefore actually conducting the reflow, set the oven to the temperatures listed below (each for about 15 minutes) and try to match the temperature using the thermometer you put inside. The markings on the temperature knob will not match the real temperatures, so we used a pen to mark the “real” knob positions for the desired temperatures.

Applying Solder PasteWhen ordering the PCB, buy the matching stencil along with it. You don't need a professional stencil frame, just put other PCBs of the same height around your work piece and then align it manually. If you do it right, the stencil “snaps” to the right position, as the tinned pads are slightly higher than the solder stop layer.

Solder paste applied cleanlyThe solder paste is applied cleanly on one of the footprints of pxIMU: Autopilot and IMU.


Populating the PCBIt significantly helps if you have sorted your parts with line numbers and you have a matching list. We also always have the PCB design software open.

Population ExampleThis photo shows two pxIMUs partly populated. Most notably the sensors and some capacitors are populated, but not yet parts on the board edges like larger connectors.


Placement help for LEDsThis image shows the schematic symbol of the leds on top of the real led. This helps when populating with a microscope and saves the led-test with a multimeter.


Heating up / SolderingThe actual soldering step is quite easy. Just remember to move the PCB VERY GENTLY from your desk into the oven. One slight vibration and your parts are misaligned.

Edit this diagram


Profile When setting a new temperature, turn the knob further than needed and then turn it back. Else the temperature controller might not respond at all.

References and similar GuidesPlease find below a list of similar guides and references that might be helpful as well.



作者: 爱人的眼泪555    时间: 2012-6-1 21:38
不错,支持下!
作者: robter    时间: 2015-10-30 22:51
这个很好,感谢楼主




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