I'll start by saying that I am CHEAP. That and I like to make things. So when I upgraded my computer I skipped buying a CPU heatsink and made some water blocks out of copper until I got one I liked. I use it and a Harbor Freight fountain pump ( HF 41198 ). It seems to work well in that the temp reported by the Bios is 110 degrees F. Max for a Athlon xp2400. The pump just sits in a stainless tank with maybe three quarts of water.
Anyway the last water block I made using a recess in some oak that I milled with a ball end mill. And I used a ball pein hammer to form one piece of copper. After making that part I brazed it onto a thicker piece of copper and brazed in a couple of copper tubes for the tygon tubing to fit on. I used SIL-FOS WITH 15% silver ( BCuP-5 ) and a hand held propane torch to do the brazing. I annealed the copper about three times while doing the forming.
The recess in the oak is 40mm by 55 mm by 11 mm deep. Now my question is if I were going to use two dies to form the copper, what would the first die be? My thoughts are something like 20 mm by 30 mm and maybe
8 mm deep. I am thinking this would stretch the copper more in the middle. But I don't have any books with info on forming using dies and the local library is not likely to be much help.Dan