Tham khảo tài liệu 'machining and monitoring strategies part 1', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 9 Machining and Monitoring Strategies dnque brevi spatio mutander saecla animantum Et quasi cursores vitai lampada tradunt TRANSLATION The generations of living things pass in a short time and like runners hand on the torch of life TITUS LUCRETIUS CARUS 94 - 55 BC In On the Nature of the Universe II 432 Chapter 9 High Speed Machining HSM Background to HSM Possibly the first work of note on HSM was that of Salomon who ran a series of applied experiments from the period 1924 to 1931 when a German Patent was granted for this work. The Patent was founded upon a series of cutting speed curves plotted against machining temperatures for a range of materials Fig. 214 . In these tests Salomon achieved peripheral cutter speeds of 16 500 m min-1 utilising either fly-cutters - for chip morphology data or helical milling cutters - notably when cutting aluminium. Salomon contended that the cutting temperature peaked at a specific cutting speed which he termed the Supercritical speed 1 further when the speed was increased still faster the temperature he noted decreased. Moreover either side of this supercritical speed zone it was suggested that unworkable regimes occurred where the HSS cutters could not withstand the severe forces and temperatures generated. As mentioned when the cutting speed increased beyond this zone the temperature reduced to those expected by normal data cutting conditions permitting practical cutting operations to be carried out. The problem being with this early HSM work is that any theoretical rationale is not available and the experimental procedures are somewhat unclear but Salomon can be considered the founder of ultra-high speed machining UHSM - taking cutting 1 Supercritical speed mentioned by Salomon when HSM has never been truly substantiated. The practical data was based upon chip morphology experiments with fly-cut climb-milling of non-ferrous alloys soft aluminium red cast brass the latter being un-machinable with HSS cutters between 60 to .
