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Dimple Dies
I've made my own dimple die.
I drew up a few in CAD and spent most of an afternoon making one. I thought I was saving money - right up to the point I had it heat treated. DOH! If anyone else wants a go the dwg files are here: http://www.super7thheaven.co.uk/blog...-cad-drawings/ Personally, having made one - I'm buying my next ones What I'd like to know... Is there any rule for selecting the hole size in relation to the panel? How close can I go to the edge of a panel? etc. Yeh, I know I could use FEA but then I'd need the whole body in CAD. There seems to be 2 types of dimple die. Ones that leave a flat portion in the centre and ones that don't. The ones with a flat washer like bit in the middle (still has a hole). I have a dimple die from a swap meet a few years back (It's stamped 32mm - similar to above CAD) and it leaves a swage ring with a 39mm internal diameter. To get a dimple die hole to look like my previous post, I used a 38mm /1.5" hole cutter. The problem was getting the dimple die central on the oversized hole. Is my 32mm die really a 39mm die? Am I doing it wrong? Should I use a 32mm hole cutter and leave that extra ring? Should I leave that 'ugly' ring or can I remove it? I'd have to cut n file it out and that could leave a messy finish (and potential weak points). If I use the bigger cutter, what's the rule on picking it's size? e.g. for a dimple with a 50mm internal diameter, what sized cutter should I pick? How do other people centralise them? As the press applies pressure, on a test piece, I could see the sheet metal slip around as the flare was created. Should I look for different flare tools? Any help appreciated
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Mark www.super7thheaven.co.uk |
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