What Is Die Casting?

Die-casting is a type of die-casting part. It is a die-casting mechanical die-casting machine with a casting mold installed. Metals such as copper, zinc, aluminum, or aluminum alloy heated into a liquid are poured into the inlet of the die-casting machine. Die-casting, casting copper, zinc, aluminum or aluminum alloy parts of limited shape and size. Such parts are often called die-castings. Die-casting parts have different names in different places, such as die-casting parts, die-casting parts, die-casting parts, die-casting aluminum, die-casting zinc parts, die-casting copper parts, copper die-casting parts, zinc die-casting parts, aluminum die-casting parts, aluminum die-casting parts, aluminum die-casting parts. Alloy castings, aluminum alloy die casting parts, etc.

Because metal copper, zinc, aluminum and aluminum alloy have good fluidity and plasticity, and the casting process is cast in a pressure die-casting machine, aluminum die-casting parts can be made into a variety of more complex shapes, and can also be made relatively High precision and finish, which greatly reduce the machining volume of the casting and the casting surplus of metal copper, zinc, aluminum or aluminum alloy, which not only saves electricity, metal materials, but also greatly saves labor costs; and copper , Zinc, aluminum and aluminum alloys have excellent thermal conductivity, small specific gravity and high processability; thus die castings are widely used in automobile manufacturing, internal combustion engine manufacturing, motorcycle manufacturing, electric motor manufacturing, oil pump manufacturing, transmission machinery manufacturing, Precision instruments, landscaping, power construction, building decoration and other industries.

Die-casting parts can be manufactured as die-casting automotive parts, die-casting automotive engine pipe fittings, die-casting air-conditioning parts, die-casting gasoline engine cylinder heads, die-casting valve rocker arms, die-casting valve supports, cast electric parts, die-casting motor end covers, die-casting housings, die-casting pumps Housings, die-casting building accessories, die-casting decorative accessories, die-casting guardrail accessories, die-casting wheels and other parts. With the continuous development of the domestic manufacturing equipment industry, the equipment level of die-casting machines has also improved significantly, and the types of parts that can be manufactured are also constantly increasing. With the expansion, the precision and complexity of the die-casting parts have been greatly improved. I believe that in the near future, the die-casting parts will better serve our production and life!

China's economy has maintained a momentum of rapid development. As the contradiction between resources and the environment has intensified, according to the requirements of the scientific development concept, circular economy and clean production have become important national policies for sustainable socio-economic development. Experts point out that the total output of die-casting, that is, non-ferrous metal casting under various pressures including low-pressure casting and squeeze casting, is about 1.5 million tons.

It is understood that the total national automobile production reached 7.28 million units, a year-on-year increase of 27.6%, of which car production was 3.87 million units, a year-on-year increase of 39.7%. In 2012, the country's total output of die castings was 1024,000 tons, of which: 802,140 tons of aluminum die castings and 13,620 tons of magnesium die castings. From January to October 2012, the country's car production was 3.501 million vehicles, a year-on-year increase of 23.4%; sales of 3.601 million vehicles, a year-on-year increase of 22.0%. The die-casting market will still maintain rapid growth. Die-casting non-ferrous metal resources can be recycled and die-casting is advanced without cutting technology. It is especially suitable for the requirements of circular economy and clean production, and is in line with the national economic development general policy. The lightweighting of automobiles has accelerated the development of the aluminum-magnesium die-casting market; the shift in the focus of international non-ferrous metal die-casting production to China has become an inevitable trend, and the die-casting market has huge room for development.

Increased demand for aluminum alloy die castings promotes the development of die castings industry

The automotive industry is one of the important customers of the domestic die casting industry. With the development of the domestic economy and the improvement of people's living standards, domestic automobile sales have risen linearly, which has largely promoted the development of the domestic die casting industry, especially the aluminum alloy die casting industry. With the growing demand for lightening of domestic automobiles, the optimization and upgrading within the automotive industry is gradually being implemented, and gray iron castings are gradually replaced with aluminum castings, which has stimulated the increasing demand for aluminum alloy die castings. In addition, with the rapid development of the global die casting industry, the demand for aluminum alloy die castings from various industries is also increasing, and the development prospects of the die casting industry are very broad.

The control of the surface temperature of the die casting mold is very important for the production of high quality die castings. Improper or inappropriate mold temperature will also lead to instability of the casting size. During the production process, the casting will be deformed, resulting in defects such as thermal pressure, mold sticking, surface depression, shrinkage holes and thermal bubbles. When the mold temperature has a large difference, it affects variables in the production cycle, such as filling time, cooling time and spraying time, to varying degrees.

In 2012, the country's total output of die castings was 1024,000 tons, of which 802,140 tons were aluminum die castings and 13,620 tons were magnesium die castings.

The die-casting part is not formed, and the cavity is not full

Causes: 1. The temperature of the die is too low; 2. The temperature of the metal liquid is low; 3. The pressure of the press is too small; 4. The metal liquid is insufficient; The injection speed is too high;

Adjustment method: 1- 2. Increase the temperature of the die-casting mold and metal liquid; 3. Replace the high-pressure die-casting machine; 4. Add enough metal liquid to reduce the injection speed and increase the thickness of the inlet.

The design of the die-casting parts must take into account the wall thickness of the die-casting parts, the casting fillet and the mold release slope, the ribs, the pressure

Hot chamber die casting machine: zinc alloy, magnesium alloy, etc .; cold chamber die casting machine: zinc alloy, magnesium alloy, aluminum alloy, copper alloy, etc .; vertical die casting machine: zinc, aluminum, copper, lead, tin ^[2]

The main alloy materials for die casting are tin, lead, zinc, aluminum, magnesium, copper, etc. Zinc and aluminum alloys are the most widely used, followed by magnesium and copper alloys. At present, zinc, aluminum and magnesium alloys are mainly used in the electronics industry.

Die- casting zinc alloy

The molten state of the zinc alloy is very good, with a low melting point of only 365 degrees. Various post-processing can be performed, such as plating. Therefore, it has a wide range of applications. It was also used a lot in the mobile phone industry before, but because of the large ratio, the poor corrosion resistance was gradually eliminated by aluminum alloys. Currently the most used is the bathroom industry. Alloys 2, 3, 4, 5, and 7 are commonly used, and currently the most widely used is alloy 3.

Die- casting aluminum alloy

Aluminum alloy has low density but high strength. It is close to or exceeds high-quality steel. It has good plasticity and can be processed into various profiles. It has excellent electrical conductivity, thermal conductivity and corrosion resistance. It is widely used in industry, and its usage is second only to steel. . The specific weight of aluminum alloy is only about 1/3 of iron, so it is very important in various industries at present, especially in the indispensable role in the lightweight process of aircraft, ships, automobiles, electronic equipment, etc.

Commonly used are Al-Si-Cu series, ADC12 (A383), ADC10 (A380), etc. are common. There are also Al-Si-based, Al-Si-Mg-based, and Al-Mg-based. What is currently called aluminum-titanium alloy is modified by adding titanium metal to the above materials. Adding titanium metal can significantly improve the mechanical properties of the product.

Die- casting magnesium alloy

Magnesium alloy is an alloy composed of magnesium and other elements. Its characteristics are: low density, high specific strength, large specific modulus of elasticity, good heat dissipation, good shock absorption, greater shock load capacity than aluminum alloy, and good resistance to organic and alkali corrosion. The specific gravity of magnesium is about 2/3 of aluminum and 1/4 of iron. Therefore, it is widely used in mobile phones, communication equipment and other electronic equipment, auto parts, and medical equipment.

At present, the most widely used are magnesium aluminum alloys, followed by magnesium manganese alloys and magnesium zinc zirconium alloys. Commonly used grades are AZ91D, AM60B, AM50A, AS41B, etc.

Die- casting die

Die-casting molds must be made of hot-working mold steel. Commonly used steels are: H13, 2344, 8407, 8418, SKD61, DAC, FDAC, etc.

Structure of the mold: (back mold, front mold) mold base, mold core, guide post, guide sleeve thimble, tube, shunt, gate sleeve, slider, oblique guide post, hydraulic core pulling.

Mold processing equipment: milling machine, CNC machining center, wire cutting (slow wire walking), (mirror surface) spark machine, grinder, lathe, welding repair equipment.