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OEM High Pressure Die Casting Do You Know?
May 25, 2017

OEM High Pressure Die Casting mold you know?

OEM High Pressure Die Casting mold consists of two parts, namely the cover part and the active part, they are part of the combination is called parting line. In the hot room OEM High Pressure Die Casting, covering part of the gate, and in the cold room OEM High Pressure Die Casting in the injection port. The molten metal can enter the mold from here, and the shape of this part matches the injection chamber in the hot chamber OEM high pressure die casting or the injection chamber in the cold room OEM high pressure die casting. The active part usually includes a push rod and a flow passage, which is a passage between the gate and the mold cavity through which the molten metal enters the mold cavity. The cover portion is normally connected to a fixed platen or front platen and the movable part is connected to a movable platen. The mold cavity is divided into two mold inserts, which are separate parts that can be removed or installed from the mold by bolts relatively easily.

The mold is specially designed to remain in the active part when the mold is opened. The push rod of the movable part will be pushed out of the casting, the push rod is usually driven by the pressure plate, it will accurately use the same size of the power of all the push rod at the same time, so as to ensure that the casting is not damaged. When the castings are rolled out, the platen shrinks all the putts to take back, ready for the next OEM high pressure die casting. As the castings are still in high temperature when stripped, only the number of putters is enough to ensure that the pressure on each putter is small enough to damage the castings. But the putter will still leave traces, it must be carefully designed so that the position of the putter will not cause too much impact on the operation of the casting.

Other parts of the mold include core skateboards and the like. The cores are used to open or open the components on the casting, and they can also be used to increase the details of the casting. There are three main cores: fixed, active and loose type. The direction of the fixed core is parallel to the direction of the casting die, which is either fixed or permanently attached to the mold. The movable core may be arranged in any direction other than the direction of removal, and the movable core must be removed from the mold cavity by means of a separating device before the casting is opened and the mold is opened. The slider and the movable core are very close, the biggest difference is that the slider can be used to make the concave surface. The use of cores and sliders in OEM High Pressure Die Casting increases the cost. Loose cores are also known as take-out blocks and can be used to make complex surfaces such as threaded holes. Before each cycle begins, you need to manually install the slider and finally push it together with the casting. And then remove the loose core. Loose core is the most expensive core, because it requires a lot of labor, and it will increase the cycle time.

The discharge port is usually thin and long (about 0.13 mm), so the molten metal can cool down quickly to reduce the waste. In the OEM High Pressure Die Casting process does not require the use of riser, because the molten metal pressure is high, can ensure that the gate from the constant flow into the mold.

Other features include hardenability, machinability, thermal cracking resistance, weldability, usability (especially for large molds), due to temperature, the most important material properties for molds are thermal shock resistance and softness. As well as cost. The life of the mold depends directly on the temperature of the molten metal and the time of each cycle. Molds for OEM High Pressure Die Casting are usually made of hard tool steel, because cast iron can not withstand the huge internal pressure, so the mold is expensive, which also leads to a high cost of mold. At higher temperatures, OEM high-pressure die-cast metal is required to use more hard alloy steel.

The main defects that occur during OEM High Pressure Die Casting include wear and erosion. Other defects include thermal cracking and thermal fatigue. When the mold surface due to temperature changes are too large defects, it will produce thermal cracking. And the use of too many times, the mold surface defects will produce thermal fatigue.