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螺栓是机器制造和工程结构中最广泛使用的基础零件。提高螺栓的使用强度水平,对现代机械向大功率、高负荷、高转速及高可靠性方向发展,有非常重要的意义。一些重要螺栓,如航空发动机、汽车、拖拉机发动机的连杆螺栓及缸盖螺栓,大多采用中碳合金钢制造。由于采用过高要求韧性而牺牲强度的淬火后高温回火工艺,因而使螺栓硬度较低,螺栓在使用装拆过程中,造成滑扣、拉长、颈缩、弯曲、六角头磨圆、断裂等现象
Bolts are the most widely used base parts in machine construction and engineering structures. The use of bolts to improve the level of strength of the modern machinery to high-power, high load, high speed and high reliability direction, is of great significance. Some important bolts, such as aeroengines, cars, tractor engine connecting rod bolts and cylinder head bolts, are mostly made of medium carbon steel. Due to the high requirements of toughness and sacrifice the strength of the quenching after the high-temperature tempering process, thus making the bolt hardness is low, the bolt in the process of using the assembly and disassembly, resulting in sliding buckle, elongated, necked, curved, hexagonal round, And so on