Lecture 11b - Machinig Overview

Lecture 11b - Machinig Overview - Machining Machining...

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Unformatted text preview: Machining Machining Material Removal Material Removal Machining Machining Material Removal Material Removal Processes Overview Processes Overview Lecture 11.b ISE 2204 Introduction to Manufacturing Processes Dr. Jaime Camelio April 2 rd , 2009 ISE 2204 Introduction to Manufacturing Processes Spring 2009 Intro Intro P r o d u c e d w i t h a T r i a l V e r s i o n o f P D F A n n o t a t o r- w w w . P D F A n n o t a t o r . c o m How chips are produced during machining Force and power requirements Mechanics of tool wear and failure Types and properties of cutting-tool materials Characteristics of machine tools Vibrations and chatter and their implications Design for machining operations Economics of machining ISE 2204 Introduction to Manufacturing Processes Spring 2009 Topics to be discussed Topics to be discussed Cutting involves single or multipoint cutting tools, such as turning, boring, drilling, tapping, milling, sawing, and broaching. Abrasive processes Advanced machining processes Advanced machining processes ISE 2204 Introduction to Manufacturing Processes Spring 2009 Common Machining Processes Common Machining Processes The major independent variables that affect cutting process are Tool material and coatings Tool shapes, surface finish and sharpness Workpiece materials and condition Cutting conditions such as speed, feed, and depth of cut Cutting fluids Characteristics of the machine tool Workpiece holding and fixturing While the dependent variables include the following Type of chip produced Force and energy dissipated during cutting ISE 2204 Introduction to Manufacturing Processes Spring 2009 Mechanics of Cutting Mechanics of Cutting Force and energy dissipated during cutting Temperature rise in the workpiece, the tool, and the chip Tool wear and failure Surface finish and surface integrity of the workpiece Machining is the method whereby materials are removed from workpiece by cutting processes Important specifications 1) Depth of cut t o 2) Feed or feed rate (mm/rev or in/rev) 3) Spindle velocity (rpm) The phenomenon of material removal is that a cutting tool moves to the left along the workpiece the tool causes the material to shear by plastic deformation ISE 2204 Introduction to Manufacturing Processes Spring 2009 Fundamentals of Machining Fundamentals of Machining P r o d u c e d w i t h a T r i a l V e r s i o n o f P D F A n n o t a t o r- w w w . P D F A n n o t a t o r . c o m Schematic illustration of a two-dimensional cutting process, or ISE 2204 Introduction to Manufacturing Processes Spring 2009 Orthogonal Cutting Orthogonal Cutting orthogonal cutting. (a) Orthogonal cutting with a well-defined shear plane, also known as the Merchant model; (b) Orthogonal cutting without a well-defined shear plane....
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This note was uploaded on 02/20/2010 for the course ISE 2204 taught by Professor Rhsturges during the Spring '08 term at Virginia Tech.

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Lecture 11b - Machinig Overview - Machining Machining...

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