Development of production scheme for the blast-wave loading of metal to harden bolt holes in rails
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Bolt holes in rails should be blast-hardened without residual deformation or with the aim of minimal deformation; metal settlement above 3% causes macro- and microfailure of the surface and a reduction in longevity.
In the absence of failure of the treated surface of the bolt hole, efficiency of loading by blast wave is determined by the magnitude of the hardening gradient G. The lower G, the greater the longevity of the rails relative to the bolt holes.
The scheme of loading with a plastic explosive with two-sided simultaneous axisymmetric blast initiation with a detonating fuse is optimal. This loading ensures the minimal hardening gradient G, maximum hardening stability along the generatrix of the hole, and maximum thickness of the hardened layer.
KeywordsExplosive Maximum Thickness Blast Wave Plastic Explosive Blast Initiation
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