Friction-furnace. Needs to be made of a meterial with a higher (i.e. a bit to spare) melting point than anything it is capable of heating, connect to waterweheel bank/windfarm (100s, if not 1000s, of power-units to operate - possibly increase according to the resulting temperature needed) and a number of mechanisms involved in construction (gearing down the available rotational energy to a slow but inexorable force to the "turning lump" of material that is made to rubbing against the "static smelter" lump (held/adjusted by a frame needing one or more further units of material) within which the target smeltee mass is processed.
This is of course a dry friction solution. Liquids or granular product (=>glassmaking?) could be heated by vigorous 'paddling' (gearing towards speed, but probably need even more power to compensate for the lower torque, unless some trick could be incorporated) could be melted be a combination of surface, lubricative and fluid friction.
Cold forging is friction as well, but the friction within the block of the substance being hammered.
Other form of friction-like energy are probably available[1] or other ways of utilising. Especially in a fantasy-esque genre. And even before we come up with magic-mediated forms, perhaps like a 'heatpump'-like concentration of a lot of "slightly hotter"ness cooled to normal in order to create a little bit of "very hot" in a key component. (Or even a lot of slight cooling from room temperature.)
[1] Down to neutron production/absorbtion, perhaps? Probably depends on your definition. That's not directly drivable by kinetic energy, though.