धातु के तार खींचने (wire drawing) की प्रक्रिया में, डाई के माध्यम से धातु का स्थायी विरूपण (permanent deformation) और प्रवाह मुख्य रूप से सामग्री के किस गुण के कारण होता है?

Match the following forging operations with their remarks: Forging Operation: A. Precision forging B. Open die forging C. Closed die forging D. Upset forging Remarks: 1. Final machining generally not necessary 2. Formation of flash plays an important role 3. Poor material utilization 4. High production rate

Which metal forming process is used to form axisymmetrical, hollow cylindrical or conical parts by rotating a flat sheet metal disc while progressively pressing it against a mandrel using a roller tool?