Stainless steel precision casting process
Make molds according to different shapes of products. T […]
Make molds according to different shapes of products. The mold is divided into upper and lower concave molds, which are completed by integrated processes such as turning, planing, milling, etching and electric spark. The shape and size of the pit are consistent with the half of the product. Because wax molds are mainly used in industrial wax type, aluminum alloy materials with low melting point, low hardness, low requirements, low price and light weight are used as molds.
A large number of industrial wax solid core models were produced using aluminum alloy molds. Under normal circumstances, an industrial wax solid core model can only correspond to one blank product.
The wax pattern sprayed with the first layer of fine sand is naturally air-dried at a set room temperature (or constant temperature), but it does not affect the shape change of the internal wax pattern. The natural air drying time depends on the complexity of the internal part of the product itself. The air drying time is about 5-8 hours.
The wax mold that has completed the sandblasting process is evenly coated with a layer of white industrial latex (silicon slurry) before the baking process to bond and solidify the sand mold, and seal the wax mold for the subsequent drying. Prepare the baking process. At the same time, after the baking process, the brittleness of the sand type can be improved, and it is easy to break the sand layer and take out the blank.
Baking process The wax mold fixed on the die and finished in the sandblasting process is placed in a special metal-tight oven (usually a steam furnace for burning kerosene). Because the melting point of industrial wax is not high, the temperature is about 150 ,, and the wax mold is melted by heat to form wax water flowing along the gate. This process is dewaxing. The wax mold that has been waxed off is just an empty sand shell. The key to precision casting is to use this empty sand shell. Generally, such wax can be used repeatedly, but these waxes must be re-filtered. Otherwise, the unclean wax will affect the surface quality of the blank, such as surface sand holes and pitting, and will also affect the shrinkage of the cast product.