How to calculate the clamping force of die casting machine

1. Toshiba's dc650 die casting machine has a nominal clamping force of 6500kn, i.e. 663t.

2. It is a kind of casting method that pouring molten alloy into the pressure chamber, filling the cavity of steel mold with high speed and solidifying the molten alloy under
pressure to form casting<

die casting process:

the liquid metal is casted at low speed or high speed and filled into the cavity of the die. The die has a movable cavity surface, which is pressed and forged with the cooling process of the liquid metal, which not only eliminates the shrinkage defects of the blank, but also makes the internal
fabric of the blank reach the forged broken grain. The comprehensive mechanical properties of the blank have been significantly improved
classification of die casting machine:

1. The heating conditions of pressing chamber of die casting machine can be divided into two categories: hot pressing chamber and cold pressing chamber< The cold chamber die casting machine can be divided into three types: vertical, horizontal and full vertical

3. Die casting is divided into magnesium alloy, aluminum alloy and zinc alloy according to material. There are both imported and domestic brands of die casting machines in China:

the main imported brands are Fulai (Germany), Yubu, Toshiba, Sumitomo (Japan), Buhler (Ruigong)

the main Hong Kong brands are Lijin, yimi and Renxing

the main domestic brands are Sankei and Guannan
the heating power is generally selected by pressing the mold locking force of the casting machine,
the die-casting instry is relatively mature in the use of mold temperature machine. Generally, it can be directly selected for customers without calculation<

1, the heating power is 12KW and the pump is 1HP when the mode-locked force is less than 150t.

2, the heating power is 18-24kw and the pump is 2HP when the mode-locked force is 150-300t.

3, the heating power is 36kw and the pump is 4HP when the mode-locked force is 300-500t.

4, the mode-locked force is more than 500t

if the temperature required by the customer's moving and fixed molds is different, choose the double loop mold temperature machine.

3. The mold locking force can be calculated according to the proct projection area and casting pressure. The specific formula is: mold locking force = 1.3 * proct projection area * casting pressure. The casting pressure is selected according to the proct material and application. For aluminum alloy: 500 ~ 600kg / cm2 for general appearance parts, 600 ~ 800kg / cm2 for parts without sand hole and 800 ~ 1000kg / cm2 for parts without leakage.

4. According to Colin's deformation when he locked it

5. The selection of tonnage of die-casting machine is involved in the initial quotation of die-casting procts and the design of die-casting die. The selection of tonnage is based on the following three steps:

I. 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) + material handle area A4 (3.14xdxd, D is the diameter of material chamber, According to the experience: General Parts 30 ~ 50, bearing parts 50 ~ 80, air tight parts 80 ~ 100

C. clamping force F2 = bulging force F1 / K, K is the safety factor: 0.85


tonnage of primary selection die casting machine

2, Check the fullness

a. the total weight = casting weight + runner weight + handle weight + overflow system weight. The projection area of each part has been calculated, and the volume can be obtained by calculating its depth

B. fullness = total weight / casting quantity. The casting quantity is the maximum alloy weight when different die casting machines use different chambers

the tonnage of the primary die casting machine can be checked according to the fullness value, Generally, the filling degree is between 40% ~ 75%

3. Check the die size

A. simply arrange the die for the casting to know the die size

B. check whether the inner distance of the cylinder of the selected die casting machine is appropriate according to the die size

finally determine the tonnage of the die casting machine

Dingding die casting machine will help you answer,...

6. You have a conceptual error. We can see the maximum specific pressure of the injection system in die casting proction directly from the pressure gauge of the die casting machine and the data transmitted by the pressure sensor to the die casting computer. However, it is only the pressure acting on the piston of the injection cylinder, not the pressure acting on the liquid metal, that is, the injection specific pressure. According to the principle of pressure transmission, the injection specific pressure * the cross-sectional area of the pressure chamber = the boost specific pressure * the cross-sectional area of the injection cylinder. Of course, here we assume that the pressure at the piston rod end of the injection cylinder is zero, otherwise we have to subtract this part of the pressure. From the above formula, injection specific pressure = boost specific pressure * injection cylinder cross-sectional area / pressure chamber cross-sectional area. Because the pressure chamber cross-sectional area is multiple less than the injection cylinder cross-sectional area, injection specific pressure is far greater than boost specific pressure, unless the pressure chamber cross-sectional area = injection cylinder cross-sectional area (this is basically impossible). The injection specific pressure * the total projected area of the die casting = the bulging force, so the die-casting machine's clamping force must be greater than the bulging force to avoid material leakage. This is why the injection specific pressure is used to calculate the clamping force when we select the tonnage of the die-casting machine. But in general, we don't know the cross-sectional area of the injection cylinder. We have to ask the equipment manufacturer or consult the equipment manual. In addition, it is necessary to choose a reasonable diameter of the pressure chamber (that is, the diameter of the punch) and combine with the casting proction experience to calculate the reasonable injection pressure and select the correct die casting machine. Of course, now the new generation of die casting machine as long as the input boost pressure value and punch diameter, die casting computer will directly calculate the injection pressure and bulging force to you.

7. The calculation formula for selecting die casting machine for die casting parts: die casting machine clamping force (T) = 1.4 * casting projection area * specific casting projection area - positive projection area of die casting parts * molus (cm2)
the tonnage of the die casting machine is the clamping force of the die casting machine, not the clamping force. The clamping force of the die casting machine is realized by the clamping force of the clamping cylinder and the elbow expansion mechanism, not the force of the clamping cylinder. As for the selection of the tonnage of die casting machine, it is related to the total projected area of die casting (including the projected area of die casting parts, slag collecting ladle, runner, sprue and cake). It is better to calculate the accurate projected area instead of using coefficient. Because the proct coefficient of large parts can not be too high, and the proct coefficient of small parts should be high, so 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 500 bar ~ 800 bar
because the die casting alloy is used to punch the die in the state of "high speed and high pressure", if the die-casting machine is not locked tightly, serious flying phenomenon will occur, which will cause hidden danger of instrial injury, messy site and poor casting quality
therefore, the die-casting machine can provide 160t die-casting force, which is called 160t die-casting machine.

8. The statement on the second floor is correct. The tonnage of the die casting machine is the clamping force of the die casting machine, not the clamping force. The clamping force of the die casting machine is realized by the clamping force of the clamping cylinder and the elbow expansion mechanism, not the clamping force of the clamping cylinder. As for the selection of the tonnage of die casting machine, it is related to the total projected area of die casting (including the projected area of die casting parts, slag collecting ladle, runner, sprue and cake). It is better to calculate the accurate projected area instead of using coefficient. Because the proct coefficient of large parts can not be too high, and the proct coefficient of small parts should be high, so 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 500 bar ~ 800 bar, which depends on experience.

9. If the proct is not hollow, it should be proced by 1250 tons die casting machine, but 400 tons is definitely not. My empirical formula is the coefficient of proct projection area x1.2 (projection area of casting and drainage system) X500 (filling pressure)

10. 1、 Check the clamping force A. total projected area a = casting projected area a1 + runner area A2 (0.15 ~ 0.3a1) + overflow drainage system A3 (0.1 ~ 0.2a1) + material handle area A4 (3.14xdxd, D is the diameter of the material chamber, also known as the diameter of the punch) B. bulging force F1 = total projected area ax injection specific pressure (MPA), the so-called injection specific pressure is the pressure on the unit area, According to the experience: General Parts 30 ~ 50, bearing parts 50 ~ 80, air tight parts 80 ~ 100C. Clamping force F2 = bulging force F1 / k k k is the safety factor: 0.85. The tonnage of the die casting machine is 2. Check the fullness. A. total weight = casting weight + runner weight + material handle weight + overflow system weight. The projection area of each part has been calculated, Then we know its volume B. fullness = total weight / casting quantity. The casting quantity is the maximum alloy weight when different die casting machines use different material chambers. According to the fullness value, we check the tonnage of the die casting machine, usually the fullness is between 40% and 75%. We check the mold size a. simply arrange the mold for the casting, Check whether the inner distance of the selected die casting machine is suitable according to the die size, and finally determine the tonnage of the die casting machine
to calculate backwards, isn't that ok.