Deep Drawing Presses

SEQUENCE OF OPERATIONS :
When the operator places the sheet to be drawn on the press tool and press the push buttons, the following sequence of operations take place:

1. The top ram will rapidly come down till it approaches the bottom tooling.

2. A limit switch the proximity switch or linear encoder reduces the speed from rapid to pressing speed and ,therefore, the ram starts the draw operation at reduced speed with the preset drawing tonnage.

3. when the drawing is complete another limit switch stops the downward motion of ram, causes decompression of oil and reverses motion of ram at a rapid speed.

4. The travel of the ram upwards is again controlled by another limit switch which can be located at any desired place.

5. Reversal of the main ram also can be associated with the return of the die cushion or by means of a selector switch it is possible to delay the cushion reversal by a preset Duration.

6. If a hydraulic ejector is provided in the main ram, it will now get a signal for ejection and the component will be pushed out of the tooling.

The press is now ready for the next operation for which the operator will have to again press the safety push buttons.

NOTE: In case of triple acting presses with down stroking blank holder, the sequence of operations will differ to the extent that first the blank holder comes down and holds the blank under pressure followed by descent of the main ram while during reversal, the ram will return first followed by the blank holder. The complete sequence of operations take place automatically without any operator's care.

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