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Anonymous users2024-02-11I saw in a mold book ("Practical Course of Injection Mold Design", edited by Zhang Wei, p. 55) that a formula for calculating the clamping force is as follows:
Clamping force: 80% expansion force
Expansion force = projected area of the product Cavity pressure (unit: m.)
pa) Number of cavities.
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Anonymous users2024-02-101. The calculation of the clamping force is equal to the projection area of the finished product in the direction of the switching mold multiplied by the number of cavities multiplied by the pressure in the mold;
2. Since there are many types of products, it is necessary to correctly judge which injection molding machine or which series should be produced by the product, whether it is monochrome, two-color, multi-color, sandwich or mixed color, etc.;
3. The tonnage of clamping force is determined by the product and plastic, the projection area of the finished product in the direction of the switch mold is obtained from the appearance size of the finished product, the required injection amount is determined by the weight of the finished product and the number of cavities and the appropriate screw diameter, and the number of cavities is considered to calculate the weight of the finished product, and the final calculation can be done.
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Anonymous users2024-02-09Hello, happy to answer your <>
Formula for calculating the clamping force of injection molding: f: clamping force ton am:
Cavity projection area cm2 pv: filling pressure kg cm2 (general plastic material filling pressure is 150-350kg cm2) (good fluidity takes the lower value, poor flow takes the higher value) filling pressure injection pressure. Example:
The projection area of the cavity is 270cm2 and the filling pressure is 220kg cm2 clamping force = 270 * 220 1000 = ,2Injection pressure pi kg cm2 pi=p*a ao,pi: injection pressure p:
Pump pressure a: effective early car area of injection cylinder ao: screw cross-sectional area a= *d2 4 d:
Diameter of the land in the middle of the land: pi Example 1: known pumping pressure Finding the injection pressure?
Pump pressure hail force = 75 kg cm2 effective area of injection cylinder = 150 cm2, screw cross-sectional area = , pi = 75 * 150 kg cm2.
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Anonymous users2024-02-08f=am*pv/1000
f: clamping force.
tonam：
Cavity projection area.
CM2PV: Filling pressure.
kg/cm2
Generally, the filling pressure of plastic materials is 150-350kg cm2;
The lower value is taken for good liquidity, and the higher value is taken for poor flow;
Filling pressure Injection pressure.
Example: Cavity projection area.
270cm2
Filling pressure. 220kg/cm2
Clamping force = 270 * 220 1000 =
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Anonymous users2024-02-07The standard calculation formula provided by Sumitomo Sumitomo Japan:
Clamping force = (product area + runner area) cm2 x material coefficient kgf cm2, where the material coefficient is as follows:
pc as = 300-500 kgf/cm2pa pp pe abs = 400-600 kgf/cm2pom pmma= 600-1000 kgf/cm2pc=800-1200 kgf/cm2
With the addition of glass fiber (GF), the coefficient increases by 100-200kgc cm2
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Anonymous users2024-02-06The standard calculation formula provided by Sumitomo Sumitomo Japan:
Clamping force = (product area + runner area) cm2 x material coefficient kgf cm2, where the material coefficient is as follows:
pc as = 300-500 kgf/cm2pa pp pe abs = 400-600 kgf/cm2pom pmma= 600-1000 kgf/cm2pc=800-1200 kgf/cm2
With the addition of glass fiber (GF), the coefficient increases by 100-200kgc cm2
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