Die-casting Process Introduction

What is the Pressure Die Casting?

The substance of high pressure die casting is also referred to as die-casting which is under high pressure, so that the liquid or semi-liquid metal is filled at a higher speed type casting (die casting mold) cavity, and molding under pressure, and solidification was obtained in the casting method. The high-pressure and high-speed filling die-casting is the two main characteristics of the die-casting. It is commonly used in injection pressure from a few thousand to tens of thousands of kPa, and even up to 2 × 105kPa. Filling speed is about 10 to 50m / s, sometimes even up to 100m / s or more. The filling time is very short, usually in the range of 0.01 ~ 0.2s.

Die Casting Process Advantages

Compared with the other casting methods, the die casting has the following three advantages:

Product quality: high dimensional accuracy of castings, generally the equivalent is 6 to 7, even up to four; surface finish is generally equivalent to 5 to 8; higher strength and hardness, strength is generally increased by 25 to 30 than sand casting, but the elongation is reduced about 70%; dimensionally stable, good interchangeability; complex die casting thin-walled castings. For example, zinc alloy die castings minimum wall thickness is up to 0.3mm;aluminum alloy die casting can be up to 0.5 mm. High production efficiency: machines with high productivity; die-casting has long life, and a pair of type casting, the life of die casting bell alloy expectancy is up to hundreds of thousands of times, or even millions of times; easy to realize mechanization and automation. The excellent economic effects: due to the exact size of die castings and smooth table pan. Generally, it is directly used and without machining and the processing volume is very small, so not only improves the metal utilization, and reduce a lot of processing equipment and working hours; castings price is very cheap, combination of die-cast metal or non-metallic materials is available.

Applications and Trends of Pressure Die Casting

High pressure die casting is one of the most advanced metal-forming methods and it is the effective way to achieve less chips and no chips, the application is very wide, and it has developed rapidly. Now the die casting alloy is no longer confined to the non-ferrous metals zinc, aluminum, magnesium and copper, and has gradually expanded to be used die casting of cast iron and steel castings. The size and weight of the die casting depends on the power of the die casting machine. The increasing power of the die-casting machine, casting shaped size can be from a few millimeters to 1 ~ 2m; weight can be from a few grams to tens of kilograms. At abroad, the die casting diameter is 2 m and a weight is 50kg of aluminum castings. Die castings are no longer limited to the automotive industry and instrument industry, and gradually expand to other various industrial sectors, such as agricultural machinery, machine tool industry, the electronics industry, the defense industry, computers, medical equipment, watches, cameras and daily hardware industries.



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