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Ie 248 study guide

Ie 248 study guide - IE 248STUDY GUIDE TEST#2 Machining...

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IE 248—STUDY GUIDE TEST #2 Machining Operations and Machine Tools – Chapter 22 Machining # Casting: Both produce a diversity of part geometries and geometric features but casting lacks precision and accuracy Machined parts: Rotational machined parts - have a cylindrical or disk-like shape. This shape is formed by a cutting tool that removes material forming a rotating part. (turning/boring – produce this part) (drilling is different in that a cylindrical shape is created internally and the drilling tool is the one that rotates not the part) Nonrotational machined parts (prismatic) – block like or plate like. This geometry is created by linear motions combined with either linear or rotating tool motions. (miling,shaping,planning and sawing – produce this part) Characteristics geometry produced by machining depend in two factors: 1- relative motion between tool and workpart 2- shape of the cutting tool These operations are classified as: Generating and Forming( which are sometimes used together) 1) Generating-> the geometry of the part is determined by the feed trajectory of the cutting tool. (straight turning, taperm contour turning, peripheral milling, and profile milling material removed accomplishe by the speed motion part shape determined by the feed motion. In other words- > the tool moves around the part and the faster it goes the more material is removed and its path determines the shape. 2) Forming-> the shape is created by the geometry of the cutting tool. Therefore the cutting edge of the tool has the reverse of the shape to be produced on the part surface. ( from turning, drilling, and broaching) cutting conditions include speed motion and feeding motion into the work. In other words-> while generating parts is all about the motion of the tool with the part forming parts is all about the shape of the tool as it moves with the part. 3) Generating and Forming - > some parts are created as the shape of the tool determines the form of the part while the speed of it generates the part itself. ( one determines the part and the other the form of the part)
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Machining : secondary process, it is followed by a basic process( casting, forging, and bar rolling) Basic process produce shapes that require refinement by secondary processes. Machining operations transform the starting shapes into the final geometries. TURNING AND RELATED OPERATIONS Turning: process in which a single point tool removes material from the surface of a rotating part. The tool makes its path linearly in a direction parallel to the axis of rotation to generate a cylindrical geometry Turning is carried out on a machine tool called lathe - > provides power to turn the part at a given rotational speed at a specified cut size. (VIDEO ABOUT IT) Cutting conditions in turning-> (Equations???) - the rotational speed is directly proportional to the cutting spee and indirectly proportional to the original diameter.
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