FIELD: mining.
SUBSTANCE: collar features connecting locks with conical thread and two-layer coating. One coating layer is applied by thermal powder diffusion zinc-plating method, the second layer being applied by phosphate coating on the end surface for welding. The adjoining part of cylindrical surface of 15-25 mm length has only phosphate coating, with the first layer width δ related to the thread obliquity by the correlation δ = 0.09...0.13 K.
EFFECT: increased durability.
1 dwg
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