装载机驱动桥壳体类零件弊病的诊断与消除(国外英文资料).docVIP

装载机驱动桥壳体类零件故障的诊断与排除(国外英文资料) The third is where the stress concentration is not easily produced. Heating temperature is 300-400 ℃, the highest must not exceed 700 ℃, the case for material grain organization change and impact strength and stiffness of the bridge shell. Secondly, whether there is crack the shell, drive axle bridge available magnetic testing and other non-destructive testing method to test, because of the large bridge shell, flaw detector probe can be draw out for bridge shell block inspection. When the equipment is untested, it can be tested by tapping the sound method or by oil. Crack when dont have to be conducted on all parts, and should concentrate on stress concentration may be produced and may appear on the part of the crack, in order to reduce unnecessary operation amount and the intensity of labor. The high strength low hydrogen welding electrode is applied to repair the crack in the drive bridge. In order to increase welding strength, reduce welding stress and deformation, the following process should be taken when welding: (1) the hole in the crack tip should be drilled at 5mm in diameter before welding. (2). Should be along the crack opening into 60-90 ° deeply wall thickness 1/3-1/2 groove; (3) should be used in dc reverse subsection welding, and welding, after 20-30 mm should knock to weld to eliminate internal stress, when the temperature dropped to 50 to 60 ℃ welded again in the next section; (4) in order to increase the strength of the repair, a 4-6mm thick outer plate can be added at the important crack (when the extra plate should be taken care of, it should be symmetrical with the center of the bridge). When cracks are severe enough to cause serious deformation of the bridge, it should be discarded. Special attention should be paid to the inspection of weld after crack welding and inspection for welding deformation. It can also be plated with chrome after wear of both ends of the bridge, and it can be trimmed with oil seal and worn