OEM Aluminum Gravity Casting By Gravity Die Casting

 

The function of die-casting coating:

★Smooth filling of liquid metal is beneficial for forming, preventing mold sticking and welding, and achieving a bright, smooth, and flat surface quality for castings.

★Protect the mold, avoid the erosion of liquid metal on the surface of the mold, reduce the thermal conductivity and temperature of the mold, and extend the lifespan of the mold.

★When opening the mold, it is conducive to the smooth demolding of the casting.

★Reduce friction and wear on the punch, plunger, and moving parts.

★Reduce mold temperature by transmitting heat dissipation.

Aluminum alloy die-casting process

The main parameters of aluminum alloy die-casting process include pressure, speed, time, and temperature.

一、 Pressure

1.1 Injection force - The force exerted by the injection hydraulic cylinder (booster cylinder) to push the injection piston to move.

1.2 Specific pressure - refers to the pressure exerted on a unit area of molten metal in a pressure chamber. The specific pressure during filling is called the injection specific pressure, and the specific pressure after injection is called the boost specific pressure.

1.3 Adjusting the specific pressure can be achieved by adjusting the injection force and selecting different punch diameters.

Empirical data: Bearing parts: 50-80MPa

Thin walled parts, gas tight parts: 80-100 MPa

二、 Speed

2.1 Low speed injection - is to ensure the smooth flow of molten metal and the smooth discharge of air.

Empirical data: Low pressure injection velocity V1: 0.1~0.5m/s

Thin walled parts, exterior decorative parts: 0.25-0.35m/s

Pressure resistance, high strength parts: 0.15~0.25m/s

2.2 High speed injection - When the metal liquid reaches the inner gate, high-speed switching can be carried out.

High speed injection velocity V2: 0.2~4.5m/s

High speed injection acceleration time: t1 0.01s

Boosting time: t2 0.01s

2.3 How to choose the starting point for high-speed injection

One of the basic characteristics of die casting is rapid filling. During the entire rapid injection stage, the metal liquid enters the mold cavity in the form of a jet at a speed of 30-60m/s. It is absolutely impossible for the metal liquid not to wrap the gas. In this case, it is only meaningful to discuss where to distribute the gas.

 

Due to the fact that the cross-sectional area of the cavity in the forming part is much larger than the cross-sectional area of the inner gate, when the movement speed of the injection punch is not greater than 0.8m/s, the metal liquid flows in a nearly laminar manner in the cavity, and no entrainment occurs during this stage. From the rapid start point to the end of filling, the metal liquid moves in the form of a jet, which is the process of enveloping the gas and the location where the part produces pores.

 

For different castings, the requirements for internal microstructure density are also different; The parts of the same casting that are prone to porosity and the requirements for compactness are also different. The starting point for high-speed injection can be selected in areas where pores are not allowed.

 

三、 Time

3.1 Filling time - refers to the time required for the metal liquid to enter the cavity from the inner gate and fill the cavity. For thin parts with high surface quality requirements, the filling time has a significant impact.

The shorter the filling time, the better the surface quality and contour clarity of the casting. However, if the filling time is too fast, it is easy to cause the gas in the forming cavity to be exhausted, resulting in an increase in porosity.

3.2 Holding time - After the metal liquid fills the mold cavity, it solidifies under pressure. The holding time is related to the wall thickness of the die casting and the metal crystallization temperature.

3.3 Retention time - The period from the completion of pressure holding to the ejection of the casting during mold opening is the retention time. To ensure that the casting does not deform and crack during ejection, an appropriate retention time is required.

 

四、 Temperature

4.1 Pouring temperature - refers to the temperature at which the metal liquid enters the cavity for filling from the pressure chamber. In production, the pouring temperature is controlled by controlling the temperature of the alloy liquid in the holding furnace.

For castings with different shapes and structures, the pouring temperature can be controlled between 630-730 ℃; For thin-walled complex parts, higher temperatures can be used to improve the fluidity of the metal liquid and achieve good molding; For thick walled structural components, lower temperatures can be used to reduce solidification shrinkage.

If the pouring temperature is too high, the gas content in the aluminum water will increase, making it easy for the thick wall of the casting to produce pores, shrinkage cavities, and surface bubbles; At the same time, it accelerates the corrosion of the mold, causing premature aging and cracking of the mold.

The pouring temperature is too low, the flowability is poor, and defects such as cold shuts, flow patterns, and insufficient pouring are prone to occur; Low temperature aluminum flow is prone to component deviation, resulting in hard spots in castings and making machining difficult.

4.2 Mold temperature - generally refers to the surface temperature of the mold, and its standard state is about one-third of the pouring temperature of the alloy liquid,

4.3 Mold working temperature: 180~280 ℃.

 

 

 

 

Basic Information

Total Capitalization	less than US$50,000
Country / Region	China
Year Established	2014
Total Employees	100 to 149
Business Type	Exporter, Manufacturer, Trading Company

 

Trading Capabilities

Total Annual Sales	less than US$50,000
Export Percentage	90 percent to 94 percent
OEM Services	Yes
Small Orders Accepted	Yes
Brand Names	Innolead
Payment Terms	TT
Main Competitive Advantages	Experienced R&D Department, Large Product Line, ODM (Original Designing & Manufacturing), OEM Capability, Production Capacity, Reliability, Reputation
Other Competitive Advantages	NA
Major Customer	Soprano, European Thermodynamics Ltd.
Export Markets	Australasia, Central/South America, Eastern Europe, Mid East/Africa, North America, Western Europe

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CONTACT US

Alex He

Tel:+86 15989331617

Whatsapp&Wechat:+86 15989331617

Skype ID:alex.ho43

Email: alex.he@innolead.net

 

Web:www.innolead.net

 

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