Electro galvanic-mechanical restoration of worn-out necks of large crankshafts by thick layer of iron with layer-by-layer hardening

Abstract

External method for the restoration of worn-out necks of large crankshafts by electroplating in flowing electrolyte with mechanical hardening at low temperatures (40...50 °C) is described. This method allows to prevent warpage of large crankshafts, to provide the required thickness (1.5...1.8 mm), the necessary microhardness (600...650 HV) and low roughness parameter (Ra = 1.25...2.5 μm). The use of iron chloride as electrolyte allows for quick pay-back at low material and energy costs.