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    • 1. 发明专利
    • Method of manufacturing high strength gear
    • 制造高强度齿轮的方法
    • JPS61100315A
    • 1986-05-19
    • JP22012084
    • 1984-10-19
    • Toyota Motor Corp
    • SHIMAZAKI NOBUOSASAMORI TAKEFUSATSUZUKI MIKIOKATO SHOGOYAMAGUCHI HIROSHI
    • B23F17/00B23F19/00
    • B23F19/00B23F17/001
    • PURPOSE:To greatly enhance the fatigue strength of a high strength gear used in the drive system of an automobile without the gear being turned into an assembly structure at a one rank higher level, by quenching a part in the vicinity of a tooth trough including a tooth root fillet and thereafter by subjecting the part to a cutting process. CONSTITUTION:After surface treatment when a high hardness material is subjected to a cutting process by use of a cutting tool made of CBN, ceramic, ultra-hard steel, etc., Martensite plastic flow occurs to effect metal flow which incurrs work hardening so that the structure of the material is turned into Martensite. In such a condition, the hardened part is applied with a high compression residual stress so that its fatigue strength is enhanced, and therefore, it is difficult to be cracked. Further, when it is subjected to a caburizing quenching process, an carburized abnormal layer is created so that its outer surface grain boundary is oxidized. However, when it is subjected to a cutting process after quenching, such an abnormal layer is removed and the roundness of a tooth root fillet section 3 is increased. That is, when the part in the vicinity of a tooth through including a tooth root fillet section is subjected to a cutting process after quenching, the tooth surface side of a hypoid gear tooth 1 is cut, stress concentration upon loading is relatively relaxed.
    • 目的:为了大大提高用于汽车的驱动系统的高强度齿轮的疲劳强度,而不会使齿轮变成一级高度的组装结构,通过将包括 然后通过对该零件进行切削加工。 构成:通过使用由CBN,陶瓷,超硬钢等制成的切削工具对高硬度材料进行切削加工后,进行表面处理后,发生马氏体塑性流动,进行加工硬化的金属流动, 材料的结构变成马氏体。 在这种情况下,硬化部分施加高的压缩残余应力,使得其疲劳强度提高,因此难以破裂。 此外,当进行室温骤冷处理时,产生渗碳异常层,使得其外表面晶界被氧化。 然而,在淬火后进行切削加工时,除去这样的异常层,并使齿根部3的圆度增大。 也就是说,当通过包括齿根圆角部分的齿附近的部分在淬火之后进行切割处理时,切割准双曲齿轮齿1的齿面侧,加载时的应力集中相对放松。