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一、曲轴在堆焊修复中的变形及工艺改进在汽车(或工程机械)修理厂中,磨损的发动机曲轴轴颈大部分是采用熔剂层下堆焊法来修复。用堆焊方法修复发动机曲轴轴颈会产生变形(弯曲变形或扭曲变式)。以 NJ—130发动机曲轴为例,轴的弯曲可达2毫米,长度减少达1.8毫米。在修复过程中,对轴的弯曲经常是采用冷校正的(即在变形的反向施加足够的压力)。用这种方法,从轴的疲劳强度观点看是不够理想的。为了补偿曲轴在堆焊修复中的轴向缩短,有的汽车修理厂采用了拉伸工艺,即把
First, the crankshaft in the surfacing repair deformation and process improvement In the car (or construction machinery) repair shop, wear the engine crankshaft journal most of the flux layer welding method to repair. Repairing the crankshaft journal of the engine with a build-up welding method results in deformation (bending deformation or distortion). Taking the NJ-130 engine crankshaft as an example, the shaft can bend up to 2 millimeters and the length by as much as 1.8 millimeters. During repair, the bending of the shaft is often cold-corrected (ie applying sufficient pressure in the reverse direction of deformation). With this method, the fatigue strength of the shaft is not ideal from the point of view. In order to compensate for the crankshaft in the welding repair in the axial shortening, and some auto repair shop using the stretching process, that is