is suitable for a small number of major components and metals melt at high temperatures. But it is a disadvantage that every time you need a new model. As a result, the technique is quite uneconomic for low melting point metals. For low melting temperature metals are other suitable casting technique. Die casting. The use depends on the die-casting metal melt temperature being tasted. (Bronze & brass door handles are made from the technique- As certain types of cases complextransmission car wheels, and carburetor parts can be produced by die casting.)
1) Can a large number of small, Casting light produced with great precision.
2) Little surface finishing is required.
3) Standing model (can be used again and die)
Simplestmethod of die-casting gravity die-casting. It is pouring directly from the label; external pressures or forces involved. Mainly Magnesium (Mg) suitable for this technique. Before pouring the metal powder called french chalk put into the death of cast iron of the metal sticking prevention. Magnesium is continuously heated during the process to keep right ingredients thermal and maintain fluidity of magnesium and has kept flask to prevent contact with air (02) to prevent explosive properties and the during pouring Mg reason, once the surface is being powdered. This keeps powdering result in an inert gas (S02) heavier than air, to prevent explosive reactions and also the metal surface clean and shiny. Mg is ideal for making wheels rising by using gravity die-casting, because it is tight and strong.
In this technique death is surrounded by a gas burner to keep heat right ingredients. One of the major advantages of this process; there is no need to remove the riser and runner, so to minimize waste. A little final machining is required. Aluminum is suitable for this process because it is not easily react with oxygen gas, so it is easier than Mg work (can be shaped, and easily). Solidification starts at the edges of the edge and moves inwards to the center. To check whether any cracks, the casting is painted with blue color engineering. In the airplane industry Xray technique is used instead.
High Pressure die-casting:
In highto shorten the time Don metal solidified and increase the output of metal into water cooled infected die under high pressure and pressure twice. Between each injection of metal, metal is sprayed with oil-based graphite, metal sticking to prevent to the death. Due to high pressures safety regulations should involve obeyed with great precision.
The metal injection:
1) Metal in the plunger, the closure of the pouring hole.
2) Move the metal into the die.
3) Fill the cavity of the metal.
4) intensification of the metal concentration and reduce the cavitations (applying high pressure).
Operation speed depends on the cooling rate. In this technique carefully die design is important and justified usually die used steel output High output quality. Injection plunger makes metal into the die. The metal is injected into two identical die simultaneously produce two identical castings, which increases output. High melting point metal being tasted, lower the life of the die. Provides high-pressure die-casting good surface and good die dimensions. It is suitable for all nonferrous alloys. This technique is successful in thin walled structures also. Ideal for mass production.