Cutting Data for Turning of Steel
Thoroughly describing workpiece materials and cutting tool materials, this book provides machining recommendations for turning, which is one of the major metalcutting processes.
TABLE OF CONTENTS Cutting Data for Turning of Steel
Chapter 4: Machining Power
Calculating the required power at selected machining parameters is an essential step in managing the productivity of cutting. The calculation is based on the metal removal rate and the Unit Power. This method has been known for decades and is still widely used today.
4.1. Metal Removal Rate
Metal removal rate (Q) is the volume of metal removed per unit of time and expressed through the cutting speed (Vc), depth of cut (d), and feed rate (f). The formula for calculating metal removal rate is:
where 12 is a conversion factor (12 in. = 1 ft) needed for the cutting speed, which is measured in ft / min ( sfm). The measure ft / min (sfm) is to be converted into in / min, because the depth of cut is measured in inches, and feed rate is in inches per revolution ( ipr).
Metal removal rate indicates the productivity of cutting.
4.2. Unit Power and Power Constant
The Unit Power data are given in Machining Data Handbook (Ref 2) and the Power Constant data are published in Machinery s Handbook of the last three editions: 26th Edition (Ref 36, pp.1049, 1052), 27thEdition (Ref 37, pp.1085, 1086), and 28thEdition (Ref 16, pp.1055, 1056). The Power Constant data published in these editions of Machinery s Handbooks are the same.
4.2.1. Unit Power values published in Machining Data Handbook
Average Unit Power requirements for turning of steels with carbide tools at the...
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