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Surface Integrity Cutting Fluids Machining and Monitoring Strategies_9

Tham khảo tài liệu 'surface integrity cutting fluids machining and monitoring strategies_9', kỹ thuật - công nghệ, điện - điện tử phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Machining and Monitoring Strategies 519 MACHINING Precision automotive components Precision aerospace components Optical lenses Astronomical mirrors and lenses Minute computer hardware devices Cryogenically-machined part applications MIRROR FINISH MACHINING WITH MONOLITHIC DIAMOND TOOLING HAVING AN ULTRA-HIGH FLATNESS SQUARENESS. Courtesy of Taylor Hobson H u I I s Resolution - best optical gratings capacitive sensors i.e. variable area Resolution - best air gauges inductive sensors i.e- variable area Three dimensional work-zone - an uncompensated CMM Accuracy of 25 mm hand held micrometer Three-dimensional work-zone accuracy - compensated CMM Nanostep resolution i.e. stylus instrumentation Resolution - best capacitive sensors Field emission tunnelling Figure 254. Relative dimensional sizes and scales for machining of accurate and presicion parts or equated to their respective measurement. Source Smith et al. 2002 520 Chapter 9 industrial-versions of what constitutes a micro-tool we obtain the following dimension for our tooling Ộ0.95 0.55 0.06 3 mm 0.52 mm or by simply and conveniently rounding-down let us consider in our discussion that any form of micro-tooling is to be set at or below Ộ0.5 mm. The geometric features of any micro-tools cannot simply be considered as minute version of macro-tooling . More specifically we simply do not just scaledown say a Ộ12 mm drill then manufacture its geometry as a micro-tool of for example Ộ0.25 mm drill Fig. 255a . Micro-tools have to be engineered to provide effective chip evacuation this is particularly relevant when hole-making Fig. 255b yet remain rigid enough to withstand the cutting forces generated and not fracture under these conditions. In the following sections concerning this review on micro-tooling the production processes of drilling milling and boring tools will be briefly mentioned. Micro-Drills and Drilling Probably the most significant difference when about to utilise these minuscule tools compared to their