Precision investment casting method is refers to the use of non-metallic Mold, product size accuracy is higher than ordinary sand Casting of the floorboard of the Casting process, including the dewaxing method (Lost idea for Casting or
Investment Casting), Plaster molding (Plaster Mold Casting) and Ceramic Mold (Ceramic Mold Casting) three categories.
Lost wax casting method has two kinds: Solid model (Solid Mold) method and the Ceramic Shell Mold (Ceramic Shell Mold) method, the improved method of the latter to the former.
Solid model law considering wax type condensing shrinkage, mould heating expansion and the condensing shrinkage of molten metal, production and final approximation of mould casting size. Will melt wax infuse the pledge to within the mold of metal or silicon, remove the wax type, immersed in micro powder, refractory materials and binder bubble and into the slurry. After the net drop, and coarse cloth, refractory dry. Cast into the box, to practice a mixed binder of refractory grain filling, then dry. Then heating melt wax out, make molds. With high temperature heating mold, burning a small amount of residual wax and increase its strength, and then into the molten metal.
Ceramic shell mould method with solid type until the wax production mode method is the same, just in a moistening slurry and spray sand (or float sand), not BaoMo operations, but is repeatedly and moistening slurry spray sand, until get the shell thickness. Dry flow, heating, melting wax, high temperature heating again pouring, the method for the lost wax precision casting industry is widely used, because it has the following advantages:
(1) better dimensional stability
(2) the fire-proof material usage is less
(3) light weight, easy handling, processing, production of large castings
(4) process can be partial automation to save manpower, increase production rate
(5) the production cost is low
(6) with thin ceramic shell mould, pouring castings after cooling rate is higher and evenly, so its better mechanical properties.
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