By Steven Liang, Albert J. Shih
This e-book presents readers with the basic, analytical, and quantitative wisdom of machining procedure making plans and optimization according to complicated and useful realizing of equipment, mechanics, accuracy, dynamics, tracking suggestions, and keep an eye on ideas that they should figuring out machining and computer instruments. it truly is written for first-year graduate scholars in mechanical engineering, and is additionally applicable to be used as a reference ebook through practising engineers. It covers themes similar to unmarried and a number of aspect slicing approaches; grinding tactics; computing device software parts, accuracy, and metrology; shear tension in slicing, slicing temperature and thermal research, and computer instrument chatter. the second one portion of the e-book is dedicated to “Non-Traditional Machining,” the place readers can locate chapters on electric discharge machining, electrochemical machining, laser and electron beam machining, and biomedical machining. Examples of practical difficulties that engineers tend to face within the box are incorporated, in addition to ideas and motives that foster a didactic studying event.
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In addition to external surfaces, internal surfaces can also be ground based on similar principles. Generally speaking, there are two types of cylindrical grinding, namely, traverse and plunge. 4a and b show the respective configurations. 22) where f is the feed per work revolution and nw is the work rotational speed in rpm. The MRR is Z w = π a p Dw vtrav . 4 Cylindrical Grinding 55 b a ap ns ns vf vtrav Ds/2 Dw f nw ap f nw Dw Fig. 4 Cylindrical-grinding operations. a Traverse grinding and b plunge grinding In plunge grinding, the wheel is fed into the workpiece without traverse motion being applied, to form a groove.
8 rps, = (10−4 ) 4 (tan 45o + cot 8o ) 20 (4) which is the lower bound for the spindle speed. There is no upper bound involved in this case since there is no mention on the available motor power. 24×10−3 in. 04×10−3 in. 052 mm. 02543 )] = 528 W. 5 shows the geometry of an end mill. The primary cutting edges are along the flutes of the cutter, with the secondary cutting edges on the bottom. The helix angle, α, of the flutes helps to even out the force variation that the cutter sees, by having a cutting edge enter the workpiece gradually.
25) 2 2 t= = . 26) Zw = . 28) T= = . 2π N 8 The force on the drill is more difficult to estimate. 29) 4 NNt 4 Nt vN t Example A standard 12 mm, 120° point angle, two-flute high speed steel (HSS) twist drills will be used to make 50 mm deep holes on aluminum workpiece. The maximum power available to drive the drills is 2 kW, the drilling time to produce one hole is not to be greater than 5 s. The transfer station must make 1200 holes before it can be stopped to change worn out drills. 75 kN or the drill may break.