TAILIEUCHUNG - Surface Integrity Cutting Fluids Machining and Monitoring Strategies_10

Tham khảo tài liệu 'surface integrity cutting fluids machining and monitoring strategies_10', kỹ thuật - công nghệ, điện - điện tử phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 530 Chapter 9 over 1 C. The hydraulic and electronic cabinets were temperature - controlled to 1 C. The refractive index of the air had to be corrected - based upon a modification to the Edlen 1966 equation as the laser path positional monitoring system would otherwise be affected with a correction factor being entered into the CNC controller. The T-shaped base of the Nanocentre was supported on three pneumatic mounts that were tuned to eliminate floor-borne vibrations of Hz. Two types of vibrational sources occur namely forced- and selfexcited with the forced vibrations originating from external sources - through the foundations while the self-excited vibrations normally being the result of internal sources. A floor vibration audit on the vibrational influences was conducted to establish whether the overall enclosure was sufficiently vibration absorbent. The floor vibration spectra gave typical vibrational readings of 1 nm rms at frequencies of 25 Hz during the tests with the external air compressors emitting a floor borne 25 Hz frequency component which had to be subsequently nullified. Further testing procedures were undertaken including modal analysis and thermal imaging of the machine s structure together with a full calibration of the machine tool s kinematics. Once all of these tests and various others had been completed and compensated for then a machining testing program could then be undertaken. A typical test piece is illustrated in Fig. 257b where an aluminium 6061-T6 part was heat treated and then stabilised of Ộ250 mm copper-plated 200 pm depth coating part. These testpieces were faced-off with a monolithic diamond tool - taking very shallow DOc s of just a few micrometres producing for example a face-turned surface texture averaging - nm Ra. Later profiling tests were also conducted prior to final operational acceptance by AWE from the machine tool builder. Prior to completing this summation of the just some of the rigorous testing procedures

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