Today we would like to discuss about some parameters about Die Casting Products processing. Let's go.

1. What is the injection specific pressure and how to adjust the injection specific pressure?
The injection specific pressure is the pressure of the molten metal in the pressure chamber per unit area. On the premise of ensuring the quality of the product, try to use a lower specific pressure. The specific pressure of lighting die casting is generally less than 50MPA. The larger the product wall thickness, the higher the specific pressure requirements. The more complex the product structure, the higher the specific pressure requirements.
2. What is the injection speed and how to adjust the injection speed?
The injection speed refers to the speed of the movement of the injection head during die casting, which is divided into slow injection speed and fast injection speed. Generally speaking, the injection speed refers to the fast injection speed. The size of the slow injection speed is that when the injection head passes through the gate, it is better that the molten metal will not splash, generally 0.1 ~ 0.5M/S, and the fast injection speed of aluminum alloy is generally 0.1 ~ 1.1M/S. The thinner the wall thickness of the casting, the faster the injection speed. The more complex the shape of the casting, the faster the injection speed. The larger the projection surface of the casting, the faster the injection speed. The longer the casting recharge path, the faster the injection speed.
3. What is pouring temperature and how to choose pouring temperature?
The pouring temperature generally refers to the average temperature when the molten metal is poured into the injection chamber and the cavity is filled. Usually, the lowest possible temperature is used under the premise of ensuring the molding and the required surface quality. The pouring temperature of aluminum alloy is 650℃~720℃, the casting alloy has good fluidity, and the pouring temperature can be lower; the casting temperature of thin-walled and complex-shaped castings can be higher; the mold is large, the heat dissipation is fast, and the pouring temperature can be higher.
4. What is the mold temperature, and what is the mold temperature during normal production of aluminum alloy die-casting molds?
The mold temperature is the temperature of the mold during the production process. The temperature of the aluminum alloy die-casting mold during normal production is: 200℃~280℃. Generally, the thinner the casting, the more complex the structure, and the higher the mold temperature requirements.
5. What is filling time? How to choose the filling time?
The time it takes for the molten metal to start injecting into the cavity until it is full is called the filling time. The filling time of aluminum alloy die-casting is: 0.01S~0.1S. The selection principle of filling time is: (1) the alloy pouring temperature is high, the filling time should be longer; (2) the mold temperature is high, the filling time is longer; (3) if the thick-walled part is far from the inner gate, the filling time should be longer; The time should be longer; (4) For alloys with high melting heat, the filling time should be longer; (5) When the exhaust effect is poor, the filling time should be longer.
6. What is holding time? What is the function of holding pressure? How to choose holding time?
The pressure holding time is also called the holding pressure time. It is the time required for solidification under the action of the pressurized specific pressure after the molten metal fills the cavity, which is called the holding time. The function of holding pressure is to crystallize the solidifying metal under pressure, so as to obtain a casting with a dense internal structure. The pressure holding time of die-casting aluminum is 1 to 2 seconds when the wall thickness of the casting is less than 2.5MM, and 3 to 8 seconds when the wall thickness of the casting is 2.5 to 6MM. The selection principle is: (1) The crystallization temperature range of the die-casting alloy is higher, and the pressure holding time is prolonged; (2) The wall thickness of the casting is large, and the pressure holding time can be longer; (3) If it is a top gate, the pressure holding time can be longer. Longer, the pressure holding time of the inner gate thickness should be longer.
7. What is the retention time? How to choose the retention time?
The retention time is also called the cold mold time, which is the residence time of the casting in the press mold. That is, the time required from the start of holding pressure to the time before the mold is opened and the casting is ejected. Sufficient mold retention time ensures that the casting is fully solidified in the mold, cooled and has a certain strength. Usually, the shortest time that the casting is ejected without deformation and cracking is appropriate. The mold retention time of die-casting aluminum alloy castings is 5S~30S, which has a direct relationship with the wall thickness of the casting. The thicker the casting wall thickness, the longer the mold retention time.

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