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Reflow Oven Recipes



Reflow Oven Recipes | 26 June, 2003

I'd like to poll the audience:

When it comes to creating/naming files for your oven recipes, do you select from a given set of recipes (E.g., 10 recipes used for all assemblies), or do you, create a 1-for-1 relationship where you have a recipe for every assembly (E.g. your recipe name is your assembly name)?

I've worked in factories that have done both and I've heard many discussions with pros and cons for both.

Any thoughts, comments, or experiences on this subject would be appreciated.



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Reflow Oven Recipes | 27 June, 2003

We run a few standard recipes, because we don't like waiting for and determining if our oven has stabalized after dialing-in a new recipe.

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Reflow Oven Recipes | 27 June, 2003

I am doing the same once I get a few varies in different profiles, I set about 6 different levels and depending on board thickness and qty of large parts I go from that. It has worked well for us. Hope this helps because we also hate waiting for another operator to get done.

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Reflow Oven Recipes | 27 June, 2003

We basically have 5-6 recipes for each oven based on mass etc... However if you like to have a quickfire way to ensure that the correct profile is running (like in a process audit) It is nice to see that the board and profile number match. (Running board XYZ with XYZ profile) this does not mean creating a new profile for each board but simply doing a "save as" on one of your established recipes. So you could have 100 different profile names all using the same recipe. This happens to be my favorite way. Of course you need an oven that allows save as commands.


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Reflow Oven Recipes | 2 July, 2003

We provide each assembly its own recipe then customize the unique recipe as required, using a SlimKIC 2000 profiler.

This tool allows precise control of the reflow process and accounts for the component and layer densities of each board. This approach too allows our customers to specify or change paste parameters if desired with no effect on any other assemblies.

It may seem a little extra work, but the unique profiles actually prevent a lot of possible operator errors.

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Reflow Oven Recipes | 5 July, 2003

I concur, each PCB is unique is the characteristics area of the PCB, component qty, SMD types, component layout, PCB infeed direction, paste.

It is generally a very good idea to treat each PCB model as a unique individual unit for optimize in the reflow process.

From direct experience this really helps avoid alot of surprise nightmares. It's good for Line audit control too.

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Reflow Oven Recipes | 5 July, 2003

We typicaly have 6 basic ones we work from. We can not have one as some of our boards are simple smt to Large ground plains to rf shielding. We also monitor board color and component types...Obviously BGA's are treated a lil different. Some boards need to have glues cured...but all in all we have been able to find 5-8 profiles work fine.


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Reflow Oven Recipes | 18 July, 2003

Hi, I see it's easier to use a few profiles. Simply and easy! But my advice is to make own profile for each board.The thickness is ok but there are other characteristics you miss that way. Even board material is not the same. If someone tells you the material in all boards is the same-that's not true. Density on each board-different. IC's - different.Is it the same using QFP or BGA? For profile - NO it's not.

One more thing - about 50% of all problems we are talking in this forum, come from reflow! I think the reason is in the universal profiles.

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Paul Huntoon


Reflow Oven Recipes | 24 July, 2003

Excellent question. In theory there is no correct answer to this question. It sounds like smtgod has baked too many cookies in his reflow oven and is on a surgar high... I use about 10 different basic reflow profiles in my ovens. Everytime we run a new product we pick the best profile run tests and tweak it from there then "save as" the assembly number. The problems we ran into with grouping like assemblies together and running common / generic profiles and that if we needed to tweak it at all we came up with a different profile and may conflict with others if we ran them under that common one. Saving each profile as it's assembly number creates better traceability for your customers as well as making it easier for the operator to load the profiles and engineers to customize them.

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