Study Of Energy Control Modeling For Plasma Deposition Manufacturing

Plasma direct deposition shaping is technology applied plasma arc as heat resource, deposit metal powder according planed path by layers and by feed inside powder , processing blank prototype of metal parts , then rigidly processing on the surface of prototype parts by laser or CNC(computer numerical controlling) milling and getting anticipated size and precision degree of surface . This art well show synthetical advantage of compositive technology . applied good mass of arc columniation , small heat affection zone ,processing flexible and high shaping degree of precision about plasma welding of welding technologies to deposition shaping ,kinds of powder material and scope of specification almost aren't limited , showing characteristic of sharp cooling and high speed solidification , organize is compacter than state of casting and manufacturing parts of grads function material . But applying the art to deposit shaping more complex structure of geometry metal parts , because infection of heat cumulation between layers and and inertial infection of heat in deposition layers , which caused heat energy of inputted welding pool to rapidly diffuse toward direction of surface of between solid and liquid , when quantity of cumulate heat reach some degree and impel surface of solid-liquid to move toward solid phase, increase geometry size of welding pool , caused final width of deposition layers is beyond width of path planed ,this result increase amount of next processing on the surface of metal parts; To avoid collapsing and being not shaped because of infection of heat cumulation , this paper present that building a mathematics model to forecast and control heat amount inputted welding pool by gun of plasma welding by theory of classic mathematics ,which decrease temperature grads between deposition layers, surface of solid-liquid , weaken effect of heat diffuse at surface of solid-liquid, finally the way may effectively control geometry size of welding pool and decrease amount of collapsing in the course of deposition shaping ,improve shapedableness and precision of prototype of metal parts .The model is that physics variable decided quantity of heat inputting in the course of deposition manufacturing are organicly coupled . Ignore initial temperature when processing basal layer , take initial temperature between layer and layer into account when manufacturing multilayer , two different nonlinear numerical model are built . Firstly setupping multi-input variable of variational parameters ,calculating value of distance from center of heat resource to maximum value in width by programming in MATLAB language in virtue of MATLAB system .Then design a visual communication frame of calculation by technology of visual programming , once input art parameters and get value of current represent key physics variable decided amount of heat inputting by calculation . Then collect data during relate experiment to attain closest actual value of current, amend numerical model of multilayer deposition manufacturing by the value being close to actual value , to get final calculation and forecast numerical model of amount of heat inputting .Before calculating heat input,to design experiment of heat efficiency of plasma gun ,and other relative experiments of heat input.Then calculating numerical value for each input variable of visual interface respectively.