Muffled tube furnaces:
As the oil tempering process requires the full solubility of the carbide in the whole section of the wire, the product has to be brought to high temperature.
For in-line oil-quench FIB masters the technology with muffled tube furnaces heated by electricity and the technology has been applied for wire sizes from 0,23 mm (carding wire) up to 13 mm
The design takes into account the easy replacement of the tubes and of the heating elements. Special care is taken to avoid the deformation of the tubes and to assure an efficient insulation of the furnace.
As the control of the temperature profile is critical for the process, a high-tech system controls the temperature in the several zones.