Die-casting process

Pressure casting (referred to as Die-casting) is the essence of high-pressure, the liquid or semi-liquid metal at a higher rate of filling Die-casting cavity, and under pressure forming and solidified casting method to obtain.

Features:

High-pressure and high-speed Die-casting Die casting is the two major characteristics. It is commonly used pressure injection pressure from a few thousand to tens of thousands of kPa, or even up to 2 × 105kPa. Filling speed of about 10 ~ 50m / s, sometimes even up to 100m / s or more. Filling time is very short, usually in the range of 0.01 ~ 0.2s. Compared with other casting methods, Die casting has the following three advantages:

advantage:

1. Good product quality

Casting size precision, generally equivalent to 6 to 7, or even up to 4; surface finish is good, generally equivalent to 5 to 8; strength and hardness is higher, the intensity of sand casting than the general increase of 25 to 30% Rate reduced by about 70%; dimensional stability, good interchangeability; can cast thin-walled complex castings. For example, the current minimum thickness of zinc alloy Die-castings up to 0.3mm; aluminum alloy castings up to 0.5mm; minimum casting aperture of 0.7mm; minimum pitch of 0.75mm.

2. High production efficiency

High productivity, such as domestic JⅢ3 horizontal cold Die casting machine can be an average of eight hours 600 to 700 times, small hot chamber Die-casting machine can be an average of every eight hours of Die-casting 3000 ~ 7000 times; Die-casting long life, Die-casting bell alloy, the life of up to hundreds of thousands of times, or even millions of times; easy to achieve mechanization and automation.

3. Economic effect is fine

Due to the precise size of the Die casting, table Pan Guangjie and so on. Generally no longer mechanical processing and direct use, or processing volume is small, it not only improves the metal utilization, but also reduces a lot of processing equipment and working hours; casting prices will be easy; can be combined with other metal or non-metallic materials . Saving both assembly man-hours and metal savings.

Die casting although there are many advantages, but there are some shortcomings, yet to be resolved.

Disadvantages:

1). Because of the high filling rate of the liquid metal and unstable flow in the Die casting, it is easy to produce porosity by the general Die-casting method and can not be heat-treated.

2). For concave complex castings, Die casting is more difficult;

3). High melting point alloys (such as copper, ferrous metals), Die-casting lower life expectancy;

4). Not small batch production, the main reason is the high cost of Die-casting manufacturing, Die-casting machine production efficiency, small batch production is not economical.

Application Scope and Development Trend of Die Casting

Die casting is one of the most advanced metal forming methods, is to achieve less chip, no chip effective way, the application is very wide, rapid development. The size and weight of the casting depends on the power of the Die-casting machine. As Die-casting machine power increases, casting size can be from a few millimeters to 1 ~ 2m; weight can be a few grams to tens of kilograms. Foreign castable diameter of 2m, weight 50kg of aluminum castings.

Die casting is no longer limited to the automotive industry and instrumentation industry, and gradually expanded to other industrial sectors, such as agricultural machinery, machine tool industry, electronics industry, defense industry, computers, medical equipment, watches, cameras and household hardware, Electronic components, belt buckle, case, metal decorative buckle, locks, zippers, and so on.Our products are exported to the United States, Europe, the United States and other countries and regions. In the Die-casting technology has emerged in vacuum Die-casting, oxygen Die-casting, precision-speed Die-casting and soluble core applications such as new technology.

Will Die casting industry in China has a very good role in promoting.