vacuum furnace
A three-dimensional finite element model of vacuum brazing furnace heater was
established. The distribution of temperature field, voltage and current density
of heater during the process of transforming current into Joule heat and
transferring heat to surrounding environment by radiation heat transfer was
simulated by thermoelectric coupling element. Meanwhile, the overall Joule heat
generation and radiation heat loss during the process are obtained by extracting
post-processing data.
Numerical simulation of welding thermal process has
been widely used, and its technology is becoming more and more mature and
perfect. However, the simulation of vacuum brazing thermal process is relatively
lacking. The heat process of vacuum brazing is characterized by the integrity of
heating, the fixity and continuity of heat source, and the simplicity of heat
transfer process, radiation heat transfer. Heating body is the most important
part of the whole vacuum brazing furnace. It transfers the Joule heat
transformed from the current into the furnace to the welding parts in the
process box and other parts of the furnace through radiation heat transfer, so
as to ensure that the furnace space reaches the predetermined temperature, thus
completing the brazing process. In this paper, a three-dimensional finite
element model of the heating body of a vacuum brazing furnace is established and
its thermal process is numerically simulated. The establishment of the model is
a very important step in the numerical simulation of heating body, because all
the analysis is based on the model. The purpose of modeling is to establish a
finite element model suitable for solution according to the actual situation and
the requirements of analysis. In vacuum brazing furnace, radiation is the most
important heat transfer mode. Joule heat generated by heating body through
current is transmitted to welding parts in process box and other parts of
furnace through radiation. Under vacuum condition, the radiation problem becomes
the radiation heat transfer between solid surfaces, which depends on the
radiation angle coefficient and blackness value. Since the calculation of
radiation involves the calculation of radiation angle coefficient, that is, the
angle of view coefficient, according to the requirements of radiation analysis,
it is necessary to establish a complete geometric model.
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