CLAMPING PRESSURE CALCULATIONS
Projected Area vs. Clamping Force
● For deep drawn, thin walls and thick bosses’ products - the clamping force (tons) must be at least 3 to 5 times the total projected area (square inches) of all the molded part and runner for a complete shot. This allows 3 tons / square inches of projected area for parts.
Example: Molds 261, 0800, 1614, 1615, 1643, etc.
● For thick walls, shallow draws products – the clamping force (tons) must be at least 2 to 3 times the total projected area (square inches) of molded part including runner. This allows 2 tons per square inches of projected area.
i. e. 227, 1611, 1612, 1813, 2010, etc
Note: Always start at minimum value. Increase gradually towards higher value while observing the product quality. If the increase in clamping force does not change or improve the product quality do not continue as it will only apply more force to the mold without any benefit and it may cause cracking of the mold parts.
SAMPLE CALCULATIONS:
A. Rectangular Shape
Projected area = L x W x no. of cavity
Tons = projected area x factor
Clamping pressure = tons x machine maximum clamping pressure / machine
max. capacity in tons)
Example:
Mold 2288 (Large Freezer Mates)
Machine Size – Meiki 450T
No. cavities – 2
Product size – L = 11.7 in.; W = 8.75 in.
Area = L x W x no. of cavities = 11.7 x 8.75 x 2 = 204.7 sq. in.
Tons = 204.7 x factor = 204.7 x 2 (mold 2288 is shallow product) = 409.4 tons
Clamping pressure = 409.4 tons x 140 kg per cm2 / 450 tons = 127.3 kg per cm2
B. Round Shape
Projected area = π D2/4 x no. of cavity
Tons = projected area x factor
Clamping pressure = tons x machine maximum clamping pressure / machine
max. capacity in tons)
Example:
Mold 1207 (Seal N Serve Cover)
Machine Size – Meiki 550T
No. cavities – 4
Product size – D = 7 in.
Area = π D2/4 x no. of cavity = 3.1416 x 72 x 4/ 4 = 153.9 sq. in.
Tons = 153.9 x factor = 153.9 x 2 (mold 1207 is shallow product) = 307.8 tons
Clamping pressure = 307.8 tons x 170 kg per cm2 / 550 tons = 95.1 kg per cm2
B. Square Shape
Projected area = L x W x no. of cavity
Tons = projected area x factor
Clamping pressure = tons x machine maximum clamping pressure / machine
max. capacity in tons)
Example:
Mold 5772 (Slim Line 2L Base)
Machine Size – Meiki 550T
No. cavities – 4
Product size – L = 4.6 in.; W = 4.6 in.
Area = L x W x no. of cavity = 4.6 x 4.6 x4 = 84.6 sq. in.
Tons = 84.6 x factor = 84.6 x 3 (mold 5772 is deep drawn product) = 254 tons
Clamping pressure = 254 tons x 170 kg per cm2 / 550 tons = 78.5 kg per cm2
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