PC integrated installation for studying of the cooling ability of fluids for hardening at lowered pressure (vacuum)

P. Danev, R. Radeva:
PC INTEGRATED INSTALLATION FOR STUDYING OF THE COOLING ABILITY OF FLUIDS FOR HARDENING AT LOWERED PRESSURE (VACUUM)

Proceedings of the 8th Seminar of the International Federation for Heat Treatment and Surface Engineering , IFHTSE 2001, Dubrovnik- Cavtat, Croatia, 12 – 14 September 2001.

ABSTRACT:
The vacuum thermal processing has a significant place in the practice of the thermal processes mainly for the instrumental and special steels. There is a center for vacuum thermal processing and chemical heat treatment at RU “Angel Kanchev”. The studying of the cooling (quenching) at lowered pressure (vacuum) with the existing technical instruments is very difficult.
The aim of the paper is to introduce the construction, operation and the means of installation, connected with PC, for studying the cooling ability of quenchants. The installation consists of the following main elements: a heating camera, a cooling camera, a controlling device, a vacuuming system, feeding and a registering part. The latter contains PC software, processing and introducing in table and graphic form the main characteristics of the quenching of the sample in the fluid “T – t” (temperature – time) and “CR – T” (cooling rate – temperature), and an analog-digit converter (ADC). The installation gives the possibility of determining the cooling ability of liquid and gaseous fluids. The temperature of heating of the sample and the fluid, the pressure (vacuum), the agitation of the quenchant, and some other factors can be changed in it. Important dependencies, explaining the influence of the main factors (parameters) of the cooling ability of each fluid, can be determined by means of the installation. The controlling process of the quenching at lowered pressure (vacuum) and the minimizing of the refuse during the practical realization of the operation are thus made possible.


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