How to calculate the projection area of die-casting clamping for

1. 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.

2. 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.

3. There are four methods to calculate the clamping force:

method 1: Empirical Formula 1
clamping force (T) = clamping force constant KP * proct projection area s (cm * cm)
KP empirical value:
PS / PE / PP - 0.32< br />ABS - 0.30~0.48;< br />PA - 0.64~0.72;< br />POM - 0.64~0.72;
adding glass fiber - 0.64 ~ 0.72
other engineering plastics - 0.64 ~ 0.8
for example, if the projection area of a proct is 410cm ^ 2 and the material is PE, the clamping force is calculated
calculated by the above formula: P = KP * s = 0.32 * 410 = 131.2 (T), 150t machine tool should be selected< Method 2: empirical formula 2: 350bar * s (cm ^ 2) / 1000.
as mentioned above, 350 * 410 / 1000 = 143.5t, 150t machine tool is selected
the above two methods are rough adjustment calculation methods, and the following are more accurate calculation methods

method 3: there are two important factors in calculating the clamping force: 1. Projected area 2. Cavity pressure
1. Projected area (s) is the maximum area proct observed along the opening and closing of the die< br /> 2、 (1) the number and location of gates
(2) the size of gates
(3) the wall thickness of the proct
(4) the viscosity characteristics of the used plastics
(5) the injection speed
3.1 grouping of the flow characteristics of thermoplastic plastics
the first group of GPPS hips TPS PE-LD PE-LLD pe-md PE-HD PP- Hpp-co pp-epdm
the second group PA6 PA66 PA11 / 12 PBT PETP
the third group CA cab cap CP EVA peel pur / TPU PPVC
the fourth group ABS AAS / ASA San MBS PPS ppo-m BDS POM
the fifth group PMMA PC / ABS PC / PBT
the sixth group PC PES PSU Pei peek UPVC
3.2 viscosity grade
all the above groups have a viscosity (flow energy) Force) level. The relative viscosity grades of each group were as follows:
group doubling constant (k)
group 1 × 0
group 2 × 35
the third group × 35-1.45
group 4 × 45-1.55
group 5 × 55-1.70
group 6 × 1.70-1.90
3.3 the cavity pressure is determined by the wall thickness, the ratio of flow and wall thickness
P 0 & 8226; P=P0• K (multiplication constant)

3.4 determination of clamping force (f)
F = P & 8226; S= P0• K• S

for example, the calculation of the clamping force of the part: Polycarbonate (PC) lamp holder
as shown in the figure, it is a round PC plastic lamp holder with an outer diameter of 220mm, a wall thickness range of 1.9-2.1mm, and a needle shaped central gate design. The longest flow of parts is 200 mm
the maximum flow resistance of molten metal occurs at the position with the thinnest wall thickness (i.e. 1.9mm), so the value of 1.9mm should be used when calculating the required injection pressure< (1) calculation of flow / wall thickness ratio
flow / wall thickness = longest flow / thinnest part wall thickness = 200 mm / 1.9 mm = 105:1
(2) application of cavity pressure / wall thickness curve
the relationship between cavity pressure and wall thickness and flow / wall thickness ratio is provided in the figure. It can be seen from the figure that the cavity pressure of injection parts with 1.9 mm wall thickness and 105:1 flow / wall thickness ratio is 160 bar, All data are applied to the first group of plastics. For other groups of plastics, we should multiply the corresponding multiplication constant K
(3) according to the cavity pressure of PC, the fluidity of
PC plastics belongs to the viscosity grade of the sixth group. Compared with the first group, the viscosity of PC is 1.7-1.9 times that of them. The different viscosity is reflected in the cavity pressure, so the cavity pressure of PC lamp holder should be 160bar × K (viscosity grade of PC), P = 160 × 1.9bar = 304bar, for safety reasons, we take 1.9times< (4) the projection area value of PC lamp holder
s= π× Lamp holder outer diameter 2 / 4 = 3.14 × twenty-two × 22 / 4 (cm2) = 380cm2
(5) clamping force of PC lamp holder
F = P & 8226; S=304bar• 380cm2=304kg/cm2• 380 cm2 = 115520kg or 115.5ton, so 120t can be used< Method 4: using CAE software (Moldflow, etc.).

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6. The owner can take the bus to Huayang in Dujiangyan and transfer to bus 804 to Shuangliu Airport. It's about two hours. It is suggested that the owner should arrive a few hours in advance to avoid traffic jams. Or take 303b from Cheng Shuangliu Airport to Jinsha station; Transfer 305 to yinfengyuan (Chuangong) and the fare is 2 yuan; After getting off the bus, stop a minibus on laochengguan road to Dujiangyan. The fare is 5 yuan
you can also take the airport bus line 303 to the terminal, and the fare is 10 yuan; Take a taxi to chadianzi long distance bus station, about 15 yuan; Take a long-distance bus to Dujiangyan, the ticket price is 8.5 yuan
I heard that Shuangliu Airport opened a long-distance airport bus to nearby counties and cities last year. It seems that there is one to Dujiangyan. You can inquire about it. Shuangliu Airport To Cheng, and Shuangliu Airport to Dujiangyan ride time is about the same
but it's too late for you to get to the airport. It's suggested that you stay in Shuangliu or Cheng for one night and leave the next day. I hope I can help you and wish you a good journey!!! thank you!!!

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8. Calculation of projection area of die casting die: length * width + overflow well + runner + material handle projection area,

9. The projected area of the proct on the parting surface is 30% of the projected area of the
runner
and the
ladle, and the sum of the two is the casting area

10. Projection area:
casting: A1 = 260 × 200 = 52000
runner: A2 = 0.21a1 = 10920
cake: A3= π D2 / 4 = 5024
discharge: A4 = 0.12a1 = 6240 total projection = (a1 + A2 + a3 + A4) × 2 = 148368
the casting is a common part, and the pressurization specific pressure is 40 148368 × 40 = 5934720
F lock = f expansion / k = 5934720 / 0.85 = 6982023, 800t optional
if the casting has strength requirements, it is necessary to choose a larger tonnage die casting machine
pressure chamber fullness:
net weight of proct: G1 = 2000
runner system: 2g2 = 10920 × seven × 0025 = 382.2
material: 2g3 = 5024 × thirty × 0025 = 753.6
discharge system: 2G4 = 6240 × six × The injection chamber diameters of 0.0025 = 187.2
pouring total weight g = G1 = G2 + G3 + G4 = 3323
800t are as follows: φ eighty φ ninety φ 100
respectively: 7100 9000 11100
selection φ 80 fullness: 3323 / 7100 = 46.8%
selected φ 100 fullness: 3323 / 11100 = 29.9%