Dr. M. Medraj Mech. Eng. Dept. - Concordia University Mech 421/6511 lecture 20/2. Chamfering. Knurling

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1 MACHINING OPERATIONS Outline Tuning and Related Opeations Dilling and Related Opeations Milling Machining & Tuning Centes Othe Machining Opeations Shaping and Planing Boaching Sawing Machinability N D D T o m πd N L MRR d Tuning and Related Opeations Tuning a machining pocess in which a singlepoint tool emoe mateial om the suace o a otating wok piece. (Lathe) o Rotational Speed 2d Feed ate Time o machining D o Mateial Remoal Rate L D d D. M. Medaj Mech. Eng. Dept. - Concodia Uniesity Mech 421/6511 lectue 20/1 D. M. Medaj Mech. Eng. Dept. - Concodia Uniesity Mech 421/6511 lectue 20/2 Opeations Related to Tuning Wok Holding Contou tuning Chameing Facing Tape tuning Fom tuning mounting the wok between centes using a "dog thee-jaw chuck Dilling Cuto Theading Boing Knuling D. M. Medaj Mech. Eng. Dept. - Concodia Uniesity Mech 421/6511 lectue 20/3 collet ace plate o non-cylindical wokpats D. M. Medaj Mech. Eng. Dept. - Concodia Uniesity Mech 421/6511 lectue 20/4

2 Engine Lathe Othe Lathes & Tuning Machine Tooloom Lathe and Speed Lathe Tuet Lathe The tailstock is eplaced with a tuet Chucking Machines No tailstock Automatic Ba Machine Simila to chuck machine but with a collet A single- and multiple-spindle ba machines NC Lathe Boing Machines the stiness o a boing ba Hoizontal and Vetical D. M. Medaj Mech. Eng. Dept. - Concodia Uniesity Mech 421/6511 lectue 20/5 D. M. Medaj Mech. Eng. Dept. - Concodia Uniesity Mech 421/6511 lectue 20/6 Dilling and Related Opeations Opeation Related to Dilling Geomety o Twist dill Shank, Neck and Dill body Helix angle, Point angle, Flute, cutting edge, Chisel edge, Magin Cutting conditions Spindle pm: N π D Feed ate: N (in/e) Reaming Tapping Counteboing Metal Remoal Rate: Machining time: MRR πd 4 2 Fo a though hole t + A Tm Fo a blind hole d T m Countesinking Cente dilling Spot acing D. M. Medaj Mech. Eng. Dept. - Concodia Uniesity Mech 421/6511 lectue 20/7 D. M. Medaj Mech. Eng. Dept. - Concodia Uniesity Mech 421/6511 lectue 20/8

3 Dill pess Upight dill Bench dill Radial dill Gang dill 2-6 dills togethe NC dill Vice, Jig and ixtue Machine Tool o dilling Upight dill pess Milling A machine opeation in which a wokpat is ed past a otating cylindical tool with multiple edges. (milling machine) Types: Peipheal milling Slab, slotting, side and staddle milling Up Milling (Conentional) & down milling (Climb) Facing milling Conentional, Patial ace, end, poile, pocket & contou Up Milling Down Milling Radial dill pess Lage dill pess designed o lage pats D. M. Medaj Mech. Eng. Dept. - Concodia Uniesity Mech 421/6511 lectue 20/9 (a) peipheal milling (b) ace milling D. M. Medaj Mech. Eng. Dept. - Concodia Uniesity Mech 421/6511 lectue 20/10 Milling Cutting Conditions Slab slotting side staddle Milling cuttes Plain milling cuttes Fom milling cuttes Face milling cuttes End milling cuttes Cutting conditions Radial Rake Angle Relie Angle conentional ace milling pocket milling Patial ace milling end milling Suace contouing poile milling D. M. Medaj Mech. Eng. Dept. - Concodia Uniesity Mech 421/6511 lectue 20/11 Spindle otation speed: Feed ate: MRR: Nn MRR wd t N π D D. M. Medaj Mech. Eng. Dept. - Concodia Uniesity Mech 421/6511 lectue 20/12

4 Milling Machines Machining Centes Machining cente highly automated machine tool capable o peoming multiple machining opeations unde CNC contol. Automatic tool change Pallet shuttles Automatic wokpat positioning hoizontal knee-and-column etical knee-and-column am type knee-and-column milling machine; am can be adjusted in and out, and toolhead can be swieled CNC tuning cente D. M. Medaj Mech. Eng. Dept. - Concodia Uniesity Mech 421/6511 lectue 20/13 D. M. Medaj Mech. Eng. Dept. - Concodia Uniesity Mech 421/6511 lectue 20/14 Mill-Tun Centes Highly automated machine tool that can peom tuning, milling, and dilling opeations on a wokpat Geneal coniguation o a tuning cente Can position a cylindical wokpat at a speciied angle so a otating cutting tool (e.g., milling cutte) can machine eatues into outside suace o pat A conentional tuning cente cannot stop wokpat at a deined angula position and does not possess otating tool spindles A pat Othe Machining Opeations: Shaping and Planing A single-point tool moes linealy elatie to the wok pat Shaping - A tool moes Planing A wokpat moes Stock Tuning Milling Dilling D. M. Medaj Mech. Eng. Dept. - Concodia Uniesity Mech 421/6511 lectue 20/15 D. M. Medaj Mech. Eng. Dept. - Concodia Uniesity Mech 421/6511 lectue 20/16

5 Othe Machining Opeations: Boaching Moes a multiple tooth cutting tool linealy elatie to wok in diection o tool axis Adantages: - Good suace inish - Close toleances - Vaiety o wok shapes possible Cutting tool called a boach - Owing to complicated and oten custom-shaped geomety, tooling is expensie Intenal Boaching: Peomed on intenal suace o a hole A stating hole must be pesent in the pat to inset boach at beginning o stoke D. M. Medaj Mech. Eng. Dept. - Concodia Uniesity Mech 421/6511 lectue 20/17 Othe Machining Opeations: Sawing powe hacksaw linea ecipocating motion o hacksaw blade against wok cicula saw bandsaw (etical) linea continuous motion o bandsaw blade D. M. Medaj Mech. Eng. Dept. - Concodia Uniesity Mech 421/6511 lectue 20/18 Machinability Machinability A measue o the success o a machining opeation usually on a wokmateial. Tool lie Foce and Powe Suace inish Easy o chip disposal Mateial Remoal ate Next Time: Cutting Tool Technology D. M. Medaj Mech. Eng. Dept. - Concodia Uniesity Mech 421/6511 lectue 20/19 D. M. Medaj Mech. Eng. Dept. - Concodia Uniesity Mech 421/6511 lectue 20/20

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