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Accurate calculation of locking force of blow molding machine
- Jun 09, 2018 -

The insufficient locking force of the blow molding machine and the product bulging die lead to the forming defect of the product, which is a very taboo thing in the blow molding production process.Now there are many equipment manufacturers, in particular, make the black-money, holding the mentality can save a province, using the clamping oil cylinder is too small, the margin is not enough, lead to plastic parts manufacturers cannot normal production of the product, for this small make up today brings you a set of formula, precision guidance, ensure your love machine can satisfy the production smoothly.

Case: as shown in the figure above, the product is 25L chemical barrel, the machine model PXB80, and the calculation formula of locking force is as follows:

F1=1000 * S1 * P1 (area units are uniformly converted into meters)

F1 = 1000 * 0.295 * 0.417 * 0.417 = 98 kn

Note: F1: clamping force required by the product, S1: projection area of the product in the direction of opening and closing die, P1: air source pressure (take 0.8mpa)





Cylinder bore

125 mm

125 mm + pressurization

140 mm + pressurization

Maximum system pressure

10 mpa

25 mpa

25 mpa

F2=1000 * S2 * P2

F2 = 1000 * 3.14 * 0.125 * 0.125 present 4 x 10 = 122 kn

Note: F2: the maximum mode-locking force of the device, S2: cylinder area (i.e., the circle's area formula S= elimination r2), P2: maximum system oil pressure

In order to ensure that the product does not bulge, it must satisfy F1 < F2, that is, the required clamping force of the product is less than the maximum clamping force of the system.