| The technics of continuous extrusion cladding which is applied to the product of aluminium cladding steel wire is a new technology that has been developped in the world from 80's, it overcomes the shortcomings of low productivity, poor quality and little variety of traditional technics of aluminium cladding steel and is used widely. The technics of continuous extrusion cladding requests that the steel wire must be preheated to proper temperature ahead of aluminium cladding steel wire. Adopping the conduct heating has the following merits: Heating fast; high heated temperature, and non- contact-type; high heating efficiency; be easy to realize temperature control automatically.This text is based on the basic principle of conduct heating , analyses the basic characteristic of conduct heating, tables three hypothesizes of model and sets up the basis model of conduct heating; Utilizes axial symmetry of steel wire to simplify the three-dimensional state equation to two-dimentional equation, utilizes MATLAB software , establishing corresponding border terms and heating power ,to change the equation to the standard form that can be solved with MATLAB function parabolic.Based on the simulation datas of the state equation from MATLAB, study the temperature field in axis and radius orientation during heating; study the relationship between temperature and time; study the relationship between heat power and linear velocity, diameter of steel wire, external temperature. Based on these relationships and simulation datas, established the function between the useful power and linear velocity, diameter, external temperature. Carry the analyse in theory and calculate on useful power and thermal waste of conduct heating machine; Provide the calculation model of general power finally, this model is suit for computer control.Get experimental datas through conduct heating experiment, and has experimental datas compared with calculate datas and calculate the error, theerror is about 10% except few points, meet the precision requirement , prove validity and accuracy of calculating formula in terms of experiment , and realize temperature control through the computer finally.The realization of this subject helps to improve the automatic level of continuous extrusion machine, strengthens the stability and sensitivity of the working course, helps to reduce workers' labour intensity, avoid randomness of regulating manually and man's operation, make the temperature control course more normal, more rational and more accurate, improve product quality and production efficiency greatly . |
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