Abstract
The article describes application of an industrial robot with an electric spindle for finish machining of parts made from aluminum alloy V95pchT2 and titanium alloy VT-20 using abrasive brushes. Effects of cutting velocity, brush deformation and supply on machining performance (edge size) and surface quality (positioning and roughness) have been identified. Based on the experimental data, mathematical dependencies have been developed.
Highlights
Manual labor mechanization and automation in edge machining or surface cleaning are still crucial issues for aircraft, rocket and machine building
Edge machining with abrasive brushes was described in [1,2,3,4,5] which deal with the issues of effective utilization of abrasive brushes and their rational application areas and technological functions
The experiments showed that edge machining performance and surface quality can have different values depending on the cutting velocity, brush deformation and supply
Summary
Surface quality depends on a positioning tolerance and a roughness (Ra). Positioning tolerance is a relative deviation from symmetric location of the rounding radius (Fig. 3): δδ. In aircraft building, according to Industrial Standard 1.000.22 – 80, edge rounding is 0,5 mm with a tolerance of ±0,2 mm. (ISO 2768-1 - 89), tolerance extremes for truncated edges (external rounding radii and bevel height) are as follows: for first-order (f) and mean (m) accuracy classes - ±0,2 mm; for coarse (c) and rough (v) accuracy classes - ±0,4 mm. In previous studies on positioning tolerances δ [7, 8], patterns of the impact of brush deformation ΔY, brush offsetting angle α (Fig. 4) and brush axle angle β on the surface quality were analyzed.
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