At present, the most popular die casting equipment on the market, hot room machine and cold room machine.Hot room machine and cold room machine belong to the category of high pressure die casting.
As new alloys were introduced, the die casting method modified to accommodate new wants and new elements creation. within the period of time, die casting machinery may solely turn out an unaggressive injection system to systematically turn out quality merchandise. attributable to the enhancements within the strength and warmth resistance of the materials accustomed develop our machines, they later allowed for higher-pressure things and processes. Today, an aggressive casting methodology has become the quality, and it generally provides a higher quality product and a robust end. The elements die casting produce in today’s machinery ar sturdy, have a wonderful surface end and ar delivered in extraordinarily high volumes. There also are new alloys with higher properties than within the past, that has unfolded die casting to new markets.
Hot Chamber Machines
Hot chamber machines ar used primarily for metal, and low freezing point alloys that don’t promptly attack and erode metal pots, cylinders, and plungers. Advanced technology and development of the latest, higher temperature materials has extended the utilization of this instrumentality for metal alloys.
Figure 1: Hot Chamber Machine. Diagram illustrates the plunger mechanism that is submerged in melted metal. fashionable machines ar hydraulicly operated and equipped with automatic sport controls and safety devices.
In the hot chamber machine, the injection mechanism is immersed in melted metal in a very chamber connected to the machine. because the plunger is raised, a port opens permitting melted metal to fill the cylinder. because the plunger moves downward waterproofing the port, it forces melted metal through the curved shape and nozzle into the die. once the metal has solidified, the plunger is withdrawn, the die opens, and also the ensuing casting is ejected.
Hot chamber machines are speedy operating. Cycle times vary from but one second for little parts advisement but one ounce to thirty seconds for the casting of many pounds. Dies are stuffed quickly (normally between 5 and forty milliseconds) and metal is injected at high pressures (1,500 to over four,500 psi). even so, fashionable technology provides shut management over these values, therefore manufacturing castings with fine detail, shut tolerances and high strength
Cold Chamber Machines
Cold chamber machines disagree from hot chamber machines primarily in one respect; the injection plunger and cylinder don’t seem to be submerged in melted metal. The melted metal is poured into a “cold chamber” through a port or gushing slot by a hand or automatic ladle. A hydraulicly operated plunger, advancing forward, seals the port forcing the metal into the latched die at high pressures. Injection pressures vary from three,000 to over ten,000 psi for each aluminum and Mg alloys, and from 6,000 to over fifteen,000 psi for copper-base alloys
Figure 2: Cold Chamber Machine. Diagram illustrates die, cold chamber and horizontal ram or plunger (in charging position).
In a cold chamber machine, a lot of melted metal is poured into the chamber than is required to fill the die cavity. This helps sustain spare pressure to pack the cavity solidly with casting alloy. Excess metal is ejected beside the casting and is an element of the whole shot.
The operation of a “cold chamber” machine could be a very little slower than a “hot chamber” machine thanks to the ladling operation. a chilly chamber machine is employed for top freezing point casting alloys as a result of plunger and cylinder assemblies are less subject to attack since they’re not submerged in melted metal