Now I think we have talked quite a lot of the procedures of
Investment Casting Parts produciton. Today we want to talk about the pouring methods commonly used in
Investment Casting production. Do you know about it?
1) There are the following methods for hot gravity pouring.
This is the most widely used form of casting, that is, after the shell is taken out of the roasting furnace, it is poured at high temperature. At this time, the metal cools slowly in the mold shell and can fill the mold with high fluidity, so the casting can well replicate the shape of the cavity and improve the precision of the casting. However, the slow cooling of the casting in the hot mold will make the grain coarse, which reduces the mechanical properties of the casting. When casting
Carbon Steel Castings, the surface of the casting that cools slowly is also prone to oxidation and decarburization, thereby reducing the surface hardness, smoothness and dimensional accuracy of the casting.
2) Vacuum suction pouring
Put the shell in the vacuum pouring box, absorb the gas in the cavity through the tiny pores in the shell, so that the liquid metal can better fill the cavity, copy the shape of the cavity, improve the precision of the casting, prevent air holes, pouring Insufficient defects. This law has been applied abroad.
3) Crystallization under pressure
Put the shell in the pressure tank for pouring. After the completion, close the pressure tank immediately, and pass high-pressure air or inert gas into the tank to solidify the casting under pressure to increase the density of the casting. The maximum pressure abroad has reached 150atm.
4) Directional crystallization (directional solidification)
Some Investment Castings, such as turbine blades, magnetic steel, etc., if their crystal structure is columnar crystals arranged in a certain direction, their working performance can be improved a lot, so investment casting directional crystallization technology is developing rapidly.
SCZY LTD is one of the professional leader in this industry, welcome you to come to us if any project need us for help at any time.
