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lecture_3_-_theory_of_metal_machining_-_ch_21.20110125.4d3efa9856a430.89348315

Lecture_3_-_theory_of_metal_machining_-_ch_21.20110125.4d3efa9856a430.89348315

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Announcements ! A nice pro/E tutorial ( Thanks to Jonathan Manton )- http://www.me.cmu.edu/academics/courses/ NSF_Edu_Proj/Wildfire_short_course/tutorials.htm A lecture schedule has been posted on the course website (under “lecture notes” section) Lecture notes will be made available on the course website prior to class (Tuesday and Thursday by noon time)
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Lecture, homework, and exam schedule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email protected] % %1'H)A +", %5- I9J K)[email protected] 0 6! 3 7+", %0'%28 E %3'H)A 6D 0 7+", 4'%28 %4'H)A +", %3- ./ 21 ;2% 6! < 7+", %5'%38 %1 00'H)A =KAB*L MA")# 05'H)A =KAB*L MA")# %% 0E'H)A +", %<- IND K)[email protected] % 2%'H)A +", %4- IND K)[email protected] 0 6! 4 7+", %<'%48 6! < 7+", %5'%38 %0 3'JKA +", %&- ./ 01 4'JKA +", %E- ./ %E 6! & 7+", %&'%E8 6! 4 7+", %<'%48 %2 %0'JKA +", 01- ./ %& %5'JKA +", 0%- 9M. 6! & 7+", %&'%E8 %5 %E'JKA 6D 2 7+", %5'018 0%'JKA +", 00- ./ 0< 6! E 7+", 01'008 %3 0<'JKA +", 02- ./ %< 0&'JKA +", 05- F)*>?)*OP),@OAB*L 6! E 7+", 01'008 %< 2'H)Q F> .C)GG %2'H)Q 9B*)C DR)? %-21K?'5-21K? S?-TMI 9B*)C 7+", %'058
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ME 350 – Lecture 3 – Chapter 21 Learning Objectives ! Overview of Machining Technology ! Theory of Chip Formation in Metal Machining ! Force Relationships and the Merchant Equation ! Power and Energy Relationships in Machining ! Cutting Temperature
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As the chip is removed, a new surface is exposed Machining " =
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Machining Operations Most important machining operations: 1. Turning 2. Drilling 3. Milling Other machining operations: Shaping and planing Broaching Sawing
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Single point cutting tool removes material from a rotating workpiece to form a cylindrical shape 1. Turning Used to create a round hole, usually by means of a rotating tool (drill bit) with two cutting edges 2. Drilling
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Rotating multiple-cutting-edge tool is moved across work to cut a plane or straight surface Two forms: 3. Milling
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Cutting Tool Classification 1. Single-Point Tools Point is usually rounded to form a nose radius – Example : 2. Multiple Cutting Edge Tools Motion relative to work achieved by rotating – Examples :
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Cutting Conditions in Machining Material removal rate can be computed as M RR =
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Roughing vs. Finishing
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