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Spring 2015MDP l2lz Manufacturing Technology l.

Assignment No. 4

1. Show by neat sketches the main parts of extrusion process"2. compare between direct and indirect extrusion.3. Compare between hot and cold extrusion.4. Compare between horizontal and vertical extrusion.5. Show by neat sketch the dead metal zone (DMZ).6. Show by neat sketches parameters affecting dead metal zone (DMZ).7 " Plot the ram motion and ram pressure curve in extrusion process.8. Show by sketches the extrusion die angle.9. Discuss parameter affecting extrusion forpe10. Sho',ri by neat sketches the tube extrusion process.1 1" Show by neat sketches impact extrusion process.12. Explain by using sketches the sheathing process.13 " Explain by using sketches center-burst.14. Expiain by using sketches pipirg.1 5 " Explain by using sketches surface cracking"16" A round aluminum bar with 60mm diameter is extruded from billet of 200

mm diameter and 400mm length. The mean yield stress of aluminum is80MPa and the coefficient of friction between billet and container is O.l7calculate the extrusion force and also calculate the contribution of thefriction.

17" Estimate the pressure required to extrude aluminum curtain rail of I section12.5 mm height, 6 mm wide flanges and 1.5 mm thickness, from 25 mmdiameter billet and 50 mm length, the ayerage yield stress is 50MPa andcoefficient of friction is 0. 15.

18. Calculate the required force to extrude steel cylinder with 50mm outerdiameter and 40mm inner diameter from 400 mm diameter and 100 mmlength billet. The coefficient of friction is 0. 1 and stress factor (K) equals20A MPa and strain hardening coefficient (n) 0.25.

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