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Naturally, the forces decreased with increased rake angle at the expense of an increased tool displacement: an increase of the rake angle from 1° to 2° resulted in about halved forces.
Critical to the economic viability of dry machining is justifying increased tool costs in terms of productivity and ecological savings achievable through the elimination of metal cutting fluids.
When a cutting fluid is used, increased tool life is easily achieved due to reduction of Co adhesion and enhancement of diamond debris removal from the cutting edge.
Investigations have shown that dry machining of titanium workpiece layers leads to increased tool wear, chip formation problems, and surface damage in the aluminum and CFRP-layers.
For instance, the increased tool edge radius would increase the surface roughness [17], and the spring back of the machined material affected by the cutting tool edge is thought to be responsible of the machined surface roughness [18].
When angled tools are used to cut the sheet (see Fig. 1), the progressive contact between the sheet and the angled tool reduces the required force at the expense of an increased tool stroke, and as stated by Guimaraes (1988), an increased deformation of the sheared sheet.
Similar(46)
Ra surface roughness values increased with the increasing tool wear.
They showed that in welded samples, tensile strength decreases with increasing tool tilt angle.
The results showed that the DRT can significantly increase tool life.
GA is an increasing tool for solving this sort of problems.
Increasing tool posture angle decreases the grain cutting depth to the critical cutting depth from brittle cutting to ductile cutting, but it increases the risk of tool interference.
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