If I were to design a black smithing interface it would combine a couple of different features. On the side of the screen would be a meter that gauges the temperature. Underneath it is an icon of a bellows. You click on that to cause the temp to go up and lay off of it for it to fall. Obviously, you are striving to keep it in a specific "green range" that is the theoretical optimal temperature to work a type of metal. Easier metals have broader ranges. Etc. Too far away from the green and you have to start over with potential loss of materials.
Secondly, I would have a pattern taking up the rest of the screen. First you have to pour molten metal into the mold. And then you have to click around the mold at specific points in a certain amount of time to forge the item. The hammer rises and falls at a specific speed so you have to move it along the pattern just right to hit the right spots.
Something like that anyways. A combination of working the bellows and striking the pattern. Better metals are more difficult to forge.