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齿轮是机械行业重要基础件之一,它广泛用来传递动力、改变运动方向.变速等.齿轮服役条件恶劣,轮齿承受滚动、滑动接触应力、摩擦力、弯曲应力和小能量多冲应力作用.齿轮主要损坏形式有;齿面接触疲劳损坏即麻点剥落、硬化层剥落;齿面磨损;轮齿脆断及齿面塑性变形等.为此要求齿轮耐磨,心部要有较高强韧性,外硬内韧的特性只有经热处理后才具有。齿轮按热处理形式分:有正火齿轮、调质齿轮、渗碳淬火齿轮,碳—氮共渗淬火齿轮、结构钢淬火齿轮等.结构钢淬火齿轮应用较为广泛,常用火焰表面淬火、高频表面淬火处理。但火焰淬火齿轮温度不易掌握,易过热、过烧、轮齿晶粒粗大,脆性大,机械性能大大降低,仅适合大型齿轮单齿淬火;高频表面淬火加热速度快,时间短、晶粒细、强韧性好、生产效率高、零件几乎不发生氧化、脱碳和变形微小质量稳定.组织相变发生在表层,心部保持原予处理组织,达到外硬内韧特
Gear is one of the important basic parts of the machinery industry, which is widely used to transmit power, change the direction of movement, gear change, etc. Gear service conditions are harsh, gear teeth subject to rolling, sliding contact stress, friction, bending stress and small energy multi-blanking stress The gear is mainly damaged in the form of; tooth surface contact fatigue damage that pitting spalling, peel hardened layer; tooth surface wear; gear teeth brittle fracture and tooth surface plastic deformation, etc. For this purpose gear wear, the heart must have higher toughness The characteristics of the outer hard inner toughness only after heat treatment only. Gear by heat treatment in the form of points: a normalized gear, quenching and tempering gear, carburizing and quenching gear, carbon - nitrogen infiltration quenching gear, structural steel quenching gear, etc .. Structural steel quenching gear is widely used, commonly used flame surface hardening, high frequency surface Quenching. However, the flame quenching gear temperature is not easy to grasp, easy to overheat, over-burning, gear tooth coarse, brittle, greatly reduced mechanical properties, only suitable for large gear single tooth quenching; high frequency surface hardening heating speed, short time, fine grain , Good toughness, high production efficiency, almost no oxidation of parts, decarburization and deformation of small quality and stability. Phase change occurs in the surface tissue, the heart to maintain the original treatment organizations,