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Surface Integrity Cutting Fluids Machining and Monitoring Strategies_7

Tham khảo tài liệu 'surface integrity cutting fluids machining and monitoring strategies_7', kỹ thuật - công nghệ, điện - điện tử phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Machining and Monitoring Strategies 497 Ball-end cutter a Influence of pick-feed on the milled surface texture. Source Schulz Hock 1994 Pick-feed CONVENTIONAL HSM - BALL-END MILLING MILLING c A typical die and mould application - from wrought stock indicating the milling cutters employed in the part s production prior to the Tmishing-ofT i.e. by polishing of the cavities. Courtesy of Sandvik Coromant b Complete machining of a non-ferrous cast impeller s surface produced on a five-axis horizontal machining centre. Courtesy of Dorries Scharmann Mach. Figure 245. The complex machining of either a sculptured or die and mould surfaces will usually necessitate both multifarious and sophisticated programming techniques 498 Chapter 9 Defining the minimum radii requirements and the maximum depth of the cavity needs consideration ensuring selected tooling can cope with these part geometries Approximately estimate the amount of excess stock material from the die or mould that needs to be removed by milling operations41 NB Establishing what is roughing-out and semifinishing operations will for a large die-set often mean that roughing-out is both more efficient and productive on conventional-speed machining centres with any semi-finishing undertaken by HSM. In preparation and prior to milling ensure that the workpiece fixturing is both accurate and precise as well as very robust and rigid otherwise this latter factor in particular is a classic source for any resultant vibrations and will significantly influence the tool s life together with degradation of the die and mould surfaces42 NB HSM requires a totally rigid fixturing if vibrational tendencies are to be minimised as it proves disastrous for any long length-to-diameter tool ratios that are often utilised for high-speed milling operations. For the machining processes they should ideally be divided into at least three types of milling 41 Material removal rate for HSM milling is generally considerably smaller than in .