Chapter 11 Variants of high speed machining
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| 5 High-performance cutting The speed of the machines used in machining operations, especially in milling operations, has increased steadily every year from past to present, and the production of complex parts has been realized in a shorter period and has become more economical. The increase in cutting speed reduced the processing time in addition to improving the process forces, tool wear, surface quality, and temperature. Because of extensive studies in the earlier-mentioned field, spindle speeds of more than 50,000 rpm have increased since the sand there has not been a significant change in spindle speeds since then [25–27] . Instead, existing studies on high-performance processing concentrate on enhanced control strategies, improved reliability, higher torque spindles, and lower lifecycle costs Motor spindles with full rotation speed and torque range are capable of increasing productivity to manufacture different materials within a single milling machine. Efficiency has been improved through optimal adaptation of fast and efficient cutting operations, including high-performance cutting (HPC) and high speed cutting (HSC) operations [25] . High cutting speeds leading to high rotational speeds characterize the HSM operation. When small chip volumes and high machine feed parameters are set at high surface removal rates, the surface of the part is very high [28] . In HPC operations, high stock removal rates are obtained as a result of applying high cutting and cutting depth. High torque at low rotational speeds is required in this HPC operation [28] . Due to the limited torque operating range, the conventional shafts presented on the market are only restrictedly appropriate for use in both operations (Fig. 11.5 ). The optimization of powerful motor spindles is performed for individual requirements of individual operations. The bearings and drive are designed for high torque for usage in HSC milling or high torques for HPC milling. Therefore the bearing |