14

4.4 ft3

4.4 ft3

(1.25 + 0.125 = 1.38 m3) 53 + 4.4 = 57.4 ft3 (1.5 + 0.125 = 1.63 m3 )

Standard Procedure

Example

15. Check planishing conditions.

15. Timing:

There will be more than enough time for 80 planishing strokes per minute. Only two valve switches are required for planishing because, during planishing, the pull-back cylinders are permanently connected to the pressure source.

During planishing, the pressure reaches only about 10% of rated;there-fore compressibility and expansion require only 10% of the previously calculated amount. The pull-back system is constantly pressurized and does not require any liquid for compression of liquid and expansion of cylinder. The total requirements are thus For the pressing stroke:

605 + 296 = 901 in3 (9900 + 4850 = 14,750 cm3) For the pull-back stroke: 605 X 0.2 = 121 in3 (9900 X 0.2 = 1980 cm3) Total = 1022 in3 (= 16,730 cm3) 1022

gpm required :

m3/h required

231 16,730

The selected accumulator and pump power plant will be more than sufficient for planishing. As a matter of fact, 100 or even 110 planishing strokes per minute will be feasible.

FIGURE 6 Vertical forging press with pull-back cylinders
FIGURE 7 Horizontal extrusion press
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Survival Treasure

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