An internal combustion engine valve with a stem of 10 mm dia

An internal combustion engine valve with a stem of 10 mm diameter is pre-formed by extruding a 25mm dia. 50mm long H13 steel bar at 1000 degree C on a press with v_o=0.5m/s through dies with 2 alpha = 120 degree included die angle and a glass-type lubricant (.assume m *=0.1). Extrusion is interrupted to leave a 20mm long head. Make a dimensioned sketch of the process at the point of stopping the punch. Calculate in systematic manner the punch pressure at this point. Calculate the press force. d. Check whether there might be danger of centerburst defect. If the answer is yes, suggest a remedy.

Solution

The pressure at the point is 61 bar .

The press force is 58 Newton.

No, there is no danger of centre burst .