MEC 322 Lecture 6: Machining

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

Document Summary

Material removal processes: a family of shaping operations, the common feature of which is removal of material from a starting work part so the remaining part has the desired geometry. Items made from a stock blank (steel bar, aluminum plate) Machining: material removal by a sharp cutting tool. Cutting action involves shear deformation of work material to form a chip. As chip is removed, new surface is exposed. Clearance angle: angle between work piece and flank. Rake angle: angle (cid:271)etween tool"s rake face and normal line. (alpha: helps guide chip away, 0 degrees: zero rake angle. Clearance angle- too big: cutting tool becomes unstable. Clearance angle- too small: tool become unstable. Non-traditional processes various energy forms other than sharp cutting tool to remove material. (not this course) Abrasive processes: material removal by hard, abrasive particles. Variety of work materials can be machined: most frequently used to cut metals.