A Repairing Method for Broken Shaft

Abstract

The invention discloses a repair method of a fracture shaft. The method comprises the following steps that a fracture shaft section with an original diameter phi is reserved, firstly a fracture surface of the fracture shaft section is machined smoothly, a conical bore is formed in the fracture surface of the fracture shaft section, then a round corner with a radius of R1 is chamfered in a bore opening of the conical bore, a connecting shaft section with the diameter phi and with a conical head on the front end surface is assembled, a round corner with a radius of R1 is chamfered in the tail portion of the conical head, and a round corner with a radius of R2 is chamfered in the head portion of the conical head; the conical head is freely embedded in the conical bore, an effective distance a between the fracture surface of the fracture shaft section and the front end surface of the connecting shaft section is kept, and a spacing ring with a height of H, the outer circle diameter phi and chamfering on two end surfaces is assembled; the shaft sections are heated to be in an effective temperature, then the spacing ring is sleeved on the tail portion of the conical head which is embedded in the conical bore by small force, free cooling to be in the normal temperature is carried out, and thus the spacing ring can freely rotate; and multiple filling pieces are respectively crammed into two end surfaces of the spacing ring, chamfering parts at two ends of the spacing ring are in sealing weld, and the fracture shaft is repaired to be smooth through normal temperature cooling.

Description

technical field [0001] The invention relates to a mechanical manufacturing method, in particular to a repair method for a broken shaft. Background technique [0002] Rotors and shafts such as motors or gears are sometimes twisted suddenly during operation. In the absence of suitable spare parts, the twisted shaft must be repaired in time to restore the equipment to work as soon as possible. It is the guiding principle of the repair work to protect the rotor and shaft from any damage during the repair work, and to ensure the firmness and quality of the repair. [0003] At present, one of the ways to repair the broken shaft is to use the groove direct welding method (see figure 1 ), that is, the fracture surface of shaft 1 and the fracture surface of shaft 2 are properly processed to form groove 3, and then connected by welding. The method of welding connection is relatively simple, but the welding strength is relatively weak, which is suitable for the connection of shaft f...

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Problems solved by technology

Besides, there is still welding residual stress after welding, but the residual stress of different methods is different. At the same time, due to the rapid cooling of the heat-affected zone, the welded parts are prone to quenched martensite and cracks under the condition of high carbon content. In addition, if the welding process is not properly controlled, defects such as pores, slag inclusions, incomplete fusion, and incomplete penetration are likely to occur. Therefore, the larger the welding surface (depth), the greater the welding stress, and the greater the possibility of welding cracks. Big

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