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General introduction
Published in Adedeji B. Badiru, Handbook of Industrial and Systems Engineering, 2013
turning, boring, and facing (Raman and Wadke, 2006). Turning is performed to make round parts (Figure 21.17) (CES Edupack, 2012), facing makes flat features, and boring fabricates non-standard-diameter internal cylindrical surfaces. Multipoint (fixed geometry) operations include milling and drilling. Milling operations (Figure 21.17) can be categorized into face milling, peripheral (slab) milling, and end milling. Face milling uses the face of the tool, whereas slab milling uses the periphery of the cutter to generate the cutting action (Figure 21.18) (CES Edupack, 2012). These are typically applied to make flat features at a rate of material removal significantly higher than single-point operations such as shaping and planning (Raman and Wadke, 2006). End milling cuts along with both the face and periphery and is used for making slots and extensive contours (Figure 21.18). Drilling is used to make standard-sized holes with a cutter with multiple active cutting edges (flutes). The rotary end of the cutter is used in the material removal process. Drilling has been the fastest and most economical method of making holes into a solid object. A multitude of drilling and relevant operations are available, including core drilling, step (peck) drilling, counterboring, and countersinking, as well as reaming and tapping (Figure 21.19) (CES Edupack, 2012).
Metal-Cutting Operations
Published in David A. Stephenson, John S. Agapiou, Metal Cutting Theory and Practice, 2018
David A. Stephenson, John S. Agapiou
When chips are not easily ejected, peck drilling (frequent withdrawals of the drill) is used to clear chips from the hole and to permit intermittent cooling of the drill. Peck drilling increases cycle time and drill wear (because the drill dwells at the bottom of the hole prior to retraction). Precise feed control is necessary to avoid excessive dwelling. Peck drilling may not be necessary if high spindle speeds are available, but may be preferred in drilling composites or layers of different materials.
Investigations into peck drilling process for large aspect ratio microholes in aluminum 6061-T6
Published in Materials and Manufacturing Processes, 2018
S. Ravisubramanian, M. S. Shunmugam
In general, different drilling strategies are followed to reduce thrust force and torque during hole making process. One such strategy is to use peck drilling in which drilling is performed in number of steps to produce large aspect ratio hole. In peck drilling, removal of debris/chips from the hole is easier compared to direct drilling. Also it is reported that tool life increases in peck drilling.[6] Another study reveals that cutting tool temperature is lower in peck drilling method. At the same time, cutting tool temperature is increased with increase in drilling depth.[7]
Automation of tool path generation in multi-process micromachine tool for micromachining of prismatic and rotational parts
Published in International Journal of Computer Integrated Manufacturing, 2018
A novel approach has been incorporated in this work for automatic CNC code generation for the production of prismatic and rotational micro parts. The following manufacturing logic was incorporated for the tool path generation, in accordance with DT110-multi-process micromachine tool (Rahman et al. 2010) specifications in contrast with the conventional machining: Spindle position is vertical in multi-process micromachine tool; hence the depth of cut needs to be controlled critically in micro turning (Asad et al. 2007). Excessive depth of cut leads to deflection, non-uniform surface finish and inaccurate geometry of finished part.In micro turning, every time the tool path is reset to the origin in order to remove the burr in each pass till the extreme end of a part.In micromachining, the combination of both straight line and taper to the surface methods has been incorporated for taper turning (Rahman et al. 2003). The straight line method was used for roughing operation and taper to the surface method was used for finishing operation.In micro drilling, peck drilling has been incorporated and it is mandatory to avoid the tool failure due to excessive cutting force and clogging of chips (Leo Kumar, Jerald, and Kumanan 2015).Similarly, micro peck end milling has been incorporated for the generation of micro and miniature slots. It is mandatory in contrast with the conventional machining to minimise tool breakage.Work coordinate system (WCS) will vary with respect to machine tool. It is framed separately and assigned to the part program.