| Popis: |
Heat treatment is one of the most important processes in many manufacturing industries. Hardening, known as the most common heat treatment process consists of heating the workpiece to the austenitization temperature and appropriate quenching process. Correct selection of quenching media decreases the risk of residual stresses, workpiece distortion or, in the most unfavorable case, the appearance of cracks on the workpieces. Quenching oil, used frequently as a cooling media, must have excellent oxidation and thermal resistance and low sediment formation and exceptional durability under use conditions, it must provide necessary quench time throughout bath life. Oils, used as quenching media, contain base oil and different types of additives according to application requirements. As the base oil, it is possible to use mineral oils, synthetic and natural oils separately or in combination. In this study, the examination results of physical-chemical properties and also cooling characteristics of new quenching oils with two different additives are presented. Cooling curves for different compositions have been evaluated according to ISO 9950 standard. |
