Die-casting Intros

PRELIMINARY INTRODUCTION OF DIE CASTING

►What is Die Casting

 

Die casting is a manufacturing process that can produce geometrically complex metal

parts through the use of reusable molds, called dies. The die casting process

involves the use of a furnace, metal, die casting machine, and die. The metal,

typically a non-ferrous alloy such as aluminum or zinc, is melted in the furnace

and then injected into the dies in the die casting machine. Die casting delivers

a reliable process with a smooth, quality surface that won’t need any additional

polishing or tooling.There are two main types of die casting machines -

hot chamber machines (used for alloys with low melting temperatures, such as zinc)

and cold chamber machines (used for alloys with high melting temeprature.)

 


►Understanding the Processes of Hot Chamber Die Casting

 

Operating sequence of the hot chamber die casting process: 1. Die is closed and

hot chamber is filled with molten metal; 2. Plunger pushes molten metal

through gooseneck and nozzle and into to the die cavity. Metal is held under pressure

until it solidifies; 3. Die opens and cores if any retract. Casting stays in

the ejector die half. Plunger returns pulling metal back through nozzle and gooseneck;

4. Ejector pins push casting out of the ejector die. As plunger uncovers

filling hole, molten metal flows through inlet to refill gooseneck. 

 


 

►Understanding the Processes of Cold Chamber Die Casting

Operating sequence of the cold chamber die casting process: 1. Die is closed

and molten metal is ladled into the cold chamber; 2. Plunger pushes

molten metal into die cavity. The metal is held under pressure until it solidfies;

3. Die opens and plunger advances to ensure casting stays in ejector die.

Cores, if any, retract; 4. Ejector pin push casting out of the ejector die

and plunger returns to ready to cast position.