08. Machining Processes

08. Machining Processes - Machining Processes Topics today...

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1 Machining Processes Topics today 1. Fundamentals 2. Turning Processes 3. Milling Processes 4. Hole Making Processes 5. other Machining Processes
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2 Topics today 1. Fundamentals 2 Turning Processes 2. Turning Processes 3. Milling Processes 4. Hole Making Processes 5. other Machining Processes Machining Processes What is it? Advantages – Variety of work materials – Variety of part shapes and geometric features – Dimensional accuracy – Good surface finishes Disadvantages – Wasteful of material – Time consuming
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3 Example Parts of Machining Processes Inputs and Outputs of Machining Processes
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4 Two Relative Motions during Machining between the workpiece and the tool 1. the cutting speed : a primary motion 2. the feed : a secondary motion Three types of chips
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5 Chips Produced in Turning Chips produced in turning: (a) tightly curled chip; (b) chip hits workpiece and breaks; (c) continuous chip moving radially away from workpiece; and (d) chip hits tool shank and breaks off. Source: After G. Boothroyd. Chip collection systems • Allowing gravity to drop them onto a steel conveyor belt. Dragging the chips from a settling tank Dragging the chips from a settling tank. • Using magnetic conveyors (for ferrous chips). • Employing vacuum methods of chip removal. • Using augers with feed screws.
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6 Temperatures in Cutting Zone Typical temperature distribution in the cutting zone. Source : After G. Vieregge. Proper Methods of Applying Cutting Fluids Schematic illustration of the proper methods of applying cutting fluids (flooding) in various machining operations: (a) turning, (b) milling, (c) thread grinding, and (d) drilling.
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7 Merchant’s Model Mechanics of Machining (Statics)
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8 Mechanics of Machining (Dynamics) Improvements in Cutting Tools
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9 Selection of Cutting Tool Materials Cost per Unit
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10 Topics today 1. Fundamentals 2. Turning Processes 3. Milling Processes 4. Hole Making Processes 5. other Machining Processes 2. Turning Processes
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Turning Calculations Depth of Cut Lathe rpm Cutting Time Metal Removal Rate, MRR Lathe General view of a typical lathe, showing various components. Source:
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08. Machining Processes - Machining Processes Topics today...

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