After adequate dry thickness, together with temperature, making sure internal melting wax off, get in line the cavity with the required precision casting blank is compared with the traditional casting process in regards to a casting method could be relatively accurately shape and high casting made the output of precision casting process: first, to make the necessary rough electrode, second electrode corruption model specific, forming the third cavity, with casting wax casting supply of the original model in wax on wax Brush layers of sand close to high temperature of the liquid material and finally cast in the mold cavity in molten iron, the shell removed after curing can be finished high precision.
China is in the last century, the fifties and sixties began casting for industrial production. This advanced casting process was an exceptional development, one after another in the aerospace, automotive, machine tools, ships, internal combustion engines, gas turbine, telecommunications equipment, weapons, Manufacture of medical equipment and cutting tools are widely found industry, but also for arts and crafts designing.
The so-called investment casting process, it simply is to use fusible material can melt model, in its coated with some special fire-resistant coating layer, after drying and hardening after the of a whole shell, and then steam or hot water from the Shell in the melting of the model, then Place the shell in the sand box, fill inside surrounding dry sand molding, and finally cast into the roaster in the warmth roasting, shell mold or by calcination in which pouring molten metal and put casting.
High dimensional accuracy of castings, generally up to CT4-6, of course, might as the associated with casting complex factors that affect dimensions precision casting more materials such as mold shrinkage, melting mode of deformation, and shell inside of heat amount of cooling change the path of the line alloy solidification shrinkage and deformation of the casting process, the actual size of ordinary investment castings precision are higher, numerous centuries . need to improve their consistency.
Suppression of melting mode, the cavity surface finish using high-pressure type, therefore, melting mold surface finish is relatively high. In addition, a special shell from the high heat binder and refractory material made proper fire-resistant paint coating on the wax pattern hanging along with molten gold cavity is in direct contact with high surface finish.
Melt casting we've got advantages is because of the TIG Casting has very high precision, surface finish Never be worried mechanical processing work, Zhi Shi in part through the requirements of the site to stay a little higher allowances can be, and even a percentage of casting Zhi stay grinding, Polishing margin, can be used without machining. Actually that the associated with investment casting method can save lots of machine tool equipment and processing time, a substantial savings of metal materials.
Another casting technique of the advantages is it can cast a variety of complex alloy castings, in particular, can be built into high-temperature alloy castings. Such as jet engine blades, its sleek profile and cooling outside of the cavity, with the machining process is impossible to form into. With producing investment casting process can be done not only to mass production, ensures consistency of the casting and machining to avoid the knife after the pattern of residual stress concentration.