MEC 322 Lecture Notes - Lecture 5: Semi-Continuity, Ram Pressure, Impact Extrusion

• School: Ryerson University
• Department: Mechanical Engineering
• Course: MEC 322
• Professor: Krishnan Venkatakrishnan

Document Summary

Bulk deformation: metal forming operation which cause significant shape change by deforming metal parts whose initial form is bulk rather than sheet. Hot working processes: heated to 0. 3 times the melting point low accuracy. Can do all hot and end with cold to get surface finish and hardening. Many operations can be near-net shape with little machining to do. Slab or plate is squeezed between opposing rolls. Deformation where thickness is reduced by compressive forces exerted by two opposing rolls: width only slightly increased. Rolls: need to deform and pull material through (hot working for friction) Two-high rolling mill: two opposing rolls, final velocity is faster (thickness, non-reversing mill: rolls rotate in same direction always, reversing mill: allows a series of reduction using same set of rolls. Three-high rolling mill: series of reductions by passing metal through multiple rollers, elevation mechanism needed to change thickness.