This is a form of pouring the most extensive, namely from roasting furnace shell out,performed at a high temperature by pouring. In the casting of carbon steel castings,casting cooling slowly also easy oxidation and decarburization, thereby reducing thecasting surface hardness, finish and dimensional accuracy. This
The metal in the mould in the slower cooling, the activity was higher in the case ofmold filling of castings, so can very good copy the shape of the cavity, improve the precision castings. This method is more common in abroad. But the casting slow cooling in heat type of coarse grains, which reduces the casting
Mechanical function.
The shell on the vacuum casting box, gas through the tiny pores suck cavity shell inliquid metal, which can better filling cavity, copy the shape of the cavity, the progress of precision castings, prevent defects, misrun of stomata. Some castings, such asturbine blades, magnetic
Steel, if the crystal structure of them is columnar crystal in a certain direction, theirperformance will be much progress, so the mould forging directional solidificationtechnology is rapidly developed. Pouring molten die forging is a strict procedure,casting methods differ
Point, so to choose appropriate method in casting mould forging process, the forgingof a good investment. The shell on the pressure in the tank for casting, finished,immediately sealed pressure tank to tank, feeding of high-pressure air or inert gas,the casting solidification under pressure, to increase the casting
Density.