How to calculate the tonnage of die-casting machine? How to choose the tonnage of die-casting machine?

How to calculate the tonnage of die-casting machine? How to choose the tonnage of die-casting machine?

Abstract: The die-casting machine is a special equipment for die-casting production. Many people often ask when choosing a die-casting machine: "My product weighs xx grams and has a size of xx*xx mm. What size of machine should I use?" First, you need to understand die-casting. The machine tonnage refers to the clamping force of the die-casting machine. The clamping force is the first parameter to be determined when selecting a die-casting machine. So how to calculate the clamping force of the die casting machine? Find out below.

1. How to calculate the tonnage of die casting machine

The tonnage of the die-casting machine is the clamping force of the die-casting machine, not the mold clamping force. The clamping force of the die-casting machine is achieved through the clamping force of the mold clamping cylinder and the toggle force expansion mechanism, not the force of the mold clamping cylinder. As for the selection of the tonnage of the die-casting machine, it is related to the total projected area of the die-casting part (including the projected area of the die-casting part, slag bag, runner, sprue and material cake). It is best to calculate the accurate projected area rather than using coefficient. Because the product coefficient of large parts cannot be too high, while the product coefficient of small parts must be high, it is more accurate to calculate the clamping force based on the actual projected area of the mold. As for the selection of casting pressure, it should be determined according to the complexity of the casting, generally ranging from 500bar to 800bar.

Since die-casting alloys are punched into the mold under "high speed and high pressure", if the die-casting machine is not tightly clamped, serious flying materials will occur, causing potential risks of work injuries, messy sites and poor casting quality.

Therefore, the die-casting machine can provide a clamping force of 160t, and the die-casting machine is called 160t.

The calculation formula for selecting a die-casting machine for die-casting parts is as follows:

Die-casting machine clamping force (t) = 1.4*casting projected area*front view projected area of die-casting*module (CM2)

2. How to choose the tonnage of die casting machine

The selection of the tonnage of the die-casting machine is involved in the early stages of die-casting product quotation and die-casting mold design. The selection of tonnage is based on the following three steps:

1. Check the clamping force

a. Total projected area A = Casting projected area A1 + Runner area A2 (0.15~0.3A1) + overflow system A3 (0.1~0.2A1) + gate area A4 (3.14xdxd, d is the diameter of the gate diameter).

b. Expansion force F1 = total projected area A x injection specific pressure (MPa). The so-called injection specific pressure is the pressure endured per unit area. According to experience: 30~50 for general parts, 50~80 for load-bearing parts, 80 for airtight parts ~100.

c. Clamping force F2 = expansion force F1/K, K is the insurance coefficient: 0.85.

2. Check fullness

a. Total weight = casting weight + sprue weight + material handle weight + overflow system weight. The projected area of each part is already known. Calculate its depth to know its volume.

b. Fullness = total weight/casting volume. The casting volume is the maximum alloy weight when different die-casting machines use different material chambers.

Check the initial tonnage of the die-casting machine based on the fullness value. Usually the fullness is between 40% and 75%.

3. Check mold size

a. Perform simple mold ranking of the castings to know the mold size.

b. Verify whether the inner distance of the Corinth column of the selected die-casting machine is appropriate according to the mold size.

Finally determine the tonnage of the die casting machine to be used.