TAILIEUCHUNG - Surface Integrity Cutting Fluids Machining and Monitoring Strategies_6

Tham khảo tài liệu 'surface integrity cutting fluids machining and monitoring strategies_6', kỹ thuật - công nghệ, điện - điện tử phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 486 Chapter 9 Fig. 239b . So by the simple action of turning a hand wheel at its end the tools could be simultaneously opened and closed - for the required trepanned diameter. This simultaneous tooling action was achieved by the singular rotating action of both the ộ20mm by 4 mm pitch left- and right-hand . M 20 X 4 square-threaded leadscrews Fig. 239c . One of the major advantages of an UHSM trepanning operation over its equivalent turning counterpart is that the cutting forces are virtually cancelled-out in a similar fashion to a conventional balanced turning operation Figs. 41 and 238 - top right . Here in this instance one tool is set and positioned slightly ahead of the other thereby not only reducing the overall DOC but allowing the trailing tool edge to effectively act as a finishing tool . This tooling positioning strategy produced an improved trepanned surface texture while it significantly reduced the harmonic departures-from-roundness as metrologically assessed later on the roundness testing machine. Moreover by effectively halving the DOC this allowed for an improvement in the chip-streaming behaviour to be attained. In a later modification to the trepanning fixture . not shown a large micrometer drum with its integrated vernier scale was fitted in place of the knurled adjustable hand-wheel see Fig. 239a allowing for some considerable discretion over the linear tooling s diametral adjustment. With such a large trepanning fixture - having the opposing tooling widely-spaced it is vital that these tools are centralised directly beneath the machine s spindle. Otherwise there is a possibility of both sine and cosine errors being present creating Abbé-type errors when adjusting and setting these tools for their diametral in-feed. UHSM - Trepanning Operation This preliminary work on UHSM by trepanning has shown that with a suitably robust tooling fixturing and allowing a large indirect range of tooling diameter adjustment - via the twin leadscrews .

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