The Impact of Restoration Technological Options of Mouldboards of Various Functionality on their Life Time
The wide distribution of mouldboard and high functionality ensured their widespread use for the work in the mining industry, road construction, agriculture and a number of other industries. These structural elements are notable for relatively high bulkiness, they have a high market price and are quite complex in manufacturing. All this necessitates the development of measures enabling to improve their reliability indicators, in particular, durability and life time. The increase in these indicators can be achieved using various restoration methods of extremely worn parts with simultaneous hardening. The existing papers, devoted to this issue, are distinguished by incomplete studies. Therefore, the authors considered a set of technological options for eliminating radial wear and through wiping in order to identify the optimal repair scheme. The following welding options were investigated: repair insert, repair insert with subsequent reinforcement, repair insert and smelting of radial wear, smelting of radial wear and reinforcement, and smelting of radial wear using the recumbent electrode method. Based on the experiments conducted in actual practice, the following results were obtained. The maximum life time (Тmax) corresponds to the mouldboards, having been subjected to additional, strengthening effects by surfacing reinforcement. The use of the technological option, consisting in insert welding, melting of the radiation wear and reinforcement, leads to a decrease in time between failures. Relatively low values of the operating time to the limit state of the mouldboards without hardening are noted. Thus, the parts, undergone hardening reinforcement, have the life time exceeding the life time of mouldboards when delivered.