Rational Route Choosing Methodology for Machine Parts Restoration and Repair

摘要

This paper presents a modern approach to choosing the optimal route for restoration and repair of machine parts with full consideration of their operating parameters as well as economic substantiation for using this or that repair technology. To determine the optimal restoration route, we need a dependency analysis, for which we should meet the condition that underlies the preventative maintenance system and that is complied with the multiplicity principle. For thread wear or thread-stripping, there are several methods of thread restoration, such as hole-welding with subsequent threading; mounting a thread insert; hole-machining and oversized threading; use of polymer materials; or mounting a threaded spiral insert. Unlike that, it is far more complicated to choose the optimal route for the worn surfaces restoration. With full consideration of the flux grade and the electrode wire material, there can be as many as 400 or even 500 selectable routes. That is why we can rely on the applicability, durability, and cost-effectiveness analysis to narrow the range of options. When choosing the best method to correct the defect, one has to duly consider how this part operates, the load it takes, and whether there are fatigue cracks. These data help to select the most optimal route on the applicability basis. The most accurate and reliable data are obtained on the basis of the real-world use of pairings, nodes, and units. When finding out whether this or that route is optimal, the techno-economic criterion is the most important one.