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Procedure to evaluate a reflow oven

Bryan Sherh

#28804

Procedure to evaluate a reflow oven | 27 May, 2004

Hello everybody, I'm urggently need a procedure to evaluate my reflow oven.Because I never did that before....can anybody provide me some information or some procedure to show me how to do? I've just modified my reflow oven,and I must evaluate it and make sure it's ok.also I must generate a report for this evaluation. Thanks a lot. Bryan.she@163.com Bryan sherh

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#28817

Procedure to evaluate a reflow oven | 27 May, 2004

An ECD OvenRIDER is an instrument designed to measure and record reflow oven parameters. It�s the only instrument I know that measures thermal transfer efficiency.

www.ecd.com

Contact your local ECD rep and they may have a demo unit they can bring over and run on your oven.

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#28818

Procedure to evaluate a reflow oven | 27 May, 2004

We use DATAPAQ 9000 tracker system,for oven profile. See web page http://www.data paq.com

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#28820

Procedure to evaluate a reflow oven | 27 May, 2004

Process Trials Procedures. Standard trials are often conducted on reflow ovens by production engineers during product assessment, machine approval or in process set-up. The following trials are also used by machine suppliers during equipment development.

Temperature Uniformity. Measure the surface temperature on an assembly or ideally on a blank laminate test board to obtain any variations across the complete conveyor belt width. This will show any peaks or low points between center or near the edge of the conveyor. Test results ideally achieved to be between 5-10*C

Thermal Loading. First a temperature profile is produced as a reference using six thermocouple probes soldered to the assembly, three on the top and three on the bottom. The oven is then thermally loaded with products. Alternatively copper laminate or steel sheets may be substituted to fully load the oven. During loading a further profile is taken to compare the temperatures in this simulated production test. If only top side heating is being considered on the oven all the probes are placed on the top of the board. Test results achieved ideally less than 10-15*C

Temperature Stability. Measuring surface temperature on an assembly or test board checking variations across the complete belt width. Repeating this trial periodically through out the day in production shows an oven's control system even with a varying environment. The test should be run with one set-up but may be run with different board types. Test results achieved ideally less than 10-15*C

Throughput Speed. Adjustments are made to the conveyor speed for the maximum envisaged circuit board throughput requirements. The preferred temperature profile for the most complex product is then the goal. Reference must be made to the paste or adhesive requirements when considering these tests.

Inerting. Evaluating nitrogen usage must be conducted with discussions on existing users of machines for consumption and maintenance. The use of nitrogen has benefits but needs to be justified. Solderability assessment of surface pads is a good measure of the benefits of nitrogen comparing samples before and after reflow in nitrogen.

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#28821

Procedure to evaluate a reflow oven | 27 May, 2004

We understand that you modified your oven and want to verify that these changes work properly. Without aguement, that's a good thing to do.

Rather than using a procedure [regardless of enlightened it may be B)] proposed in this forum, using the same protocol that was used to qualify the initial purchase acceptance would be a more realistic measure of the performance of your oven. Apples and apples, yano?

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Bryan Sherh

#28965

Procedure to evaluate a reflow oven | 5 June, 2004

Davef, Thanks a lot.It's very helpful. Regards

Bryan

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reflow oven profiler