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Unformatted text preview: sketches of each process step and then calculate: a. The starting length of the work piece. b. The die pressure and forging force for each operation. c. What changes in die pressure and forging force would occur if the upsetting process is conducted at room temperature? Figure 1. 50 100 50 250 (3) An internal combustion engine valve with a stem of 10mm diameter is pre-formed by extruding a 25mm dia. 50mm long H13 steel bar at 1000 C on a press with v o =0.5m/s through dies with 2 =120 included die angle and a glass-type lubricant (assume m*=0.1). Extrusion is interrupted to leave a 20mm long head. a. Make a dimensioned sketch of the process at the point of stopping the punch. b. Calculate in systematic manner the punch pressure at this point. c. Calculate the press force. d. Check whether there might be danger of center burst defect. If the answer is yes, suggest a remedy....
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- Spring '06