Design And Research Of Temperature Control System For Surface Model Hot Cutting Apparatus

With the quick development of construction industry and the continuous update of industrial product, the demand for the model processing industry is higher in automation, efficiency, environmental protection and accuracy. During the buiding’s biding stage and new products’ exhibition, it is very important to fabricate the designded model quickly and precisely with low cost. For the model’s processing effect mostly depends on the hot cutting equipment, processing materials and cutting temperature, it is so urgent to apply the advanced temperature control technology to the 3-d NC hot cutting equipment. ?The current surface model hot cutting system controls the processing temperature by adjusting the voltage with varistor; the above way does not very well in data observation, control precision and model effect. Meanwhile, the temperature of molybdenum wire changes as with the type of processing material. The surface quality of processing materials will be directly a ffected by the interaction of hot wire ’s temperature and running speed. Thus, it is a must to solve the problem of adjusting the hot wire’s temperature in multiple shifts. According to the situation above, this paper proposes a thought of constant temperature control for the surface model NC hot cutting equipment. The author combines the self-adaptive fuzzy PID algorithm and SCR trigger circuit based on the existing temperature control technology, and then designs a man-machine interface to provide technical support for the preset and real-time monitoring of cutting temperature.The whole system is divided into two parts: the hardware circuit and the software control. For the hardware units, after indirectly measured by thermal resistance sensors, ?the temperature signal is first transfered to data acquisition card in the form of voltage signal. The value of heating voltage can be adjusted through the SCR’s phase shift trigging control with the PID algorithm, thus, the cutting temperature changes. For the software units, the fuzzy PID algorithm is simulated by MATLAB, and the man-machine interface of temperature control is developed on LABVIEW.The processing experiment is finally conducted on the surface model NC hot cutting equipment. The result shows that the temperature control system designed in this paper can be applied feasibly in a certain range and the precision meets the requiments of engineeering.