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    • 5. 发明授权
    • Rolling part steel
    • 轧制钢
    • US5447579A
    • 1995-09-05
    • US164840
    • 1993-12-09
    • Kiyoshi HirakawaNorifumi Ikeda
    • Kiyoshi HirakawaNorifumi Ikeda
    • C22C38/00C22C38/60F16C33/32F16C33/34F16C33/62
    • C22C38/60F16C33/62Y10S148/906
    • A rolling part steel with which the strength of a rolling part of a cold-worked bearing is improved compared with that of a conventional turned part by controlling the length and number of sulfide inclusions in the steel to an optimal range, when a rolling part steel is prepared so that the maximum length of sulfide inclusions in the steel is 100 .mu.m or less and that a number of sulfide inclusions whose lengths exceed 40 .mu.m is 50 or less per unit area (160 mm.sup.2) , the roughness of its bore surface is improved to have a greater strength. As a result, for example, a thus formed raceway ring has a longer life against fatigue-induced cracks than a turned raceway ring.
    • 通过将轧制部分钢中的硫化物夹杂物的长度和数量控制在最佳范围内,与现有的轧制部分相比,冷轧轴承的轧制部分的强度提高了的滚动部件钢 制成钢的硫化物夹杂物的最大长度为100μm以下,长度超过40μm的硫化物夹杂物的数量为每单位面积(160mm 2)为50以下,其孔面的粗糙度 被改进以具有更大的实力。 结果,例如,如此形成的滚道环比转动的滚道环具有比疲劳引起的裂纹更长的寿命。
    • 7. 发明授权
    • Corrective tempering apparatus for rolling elements
    • 滚动元件矫正回火设备
    • US06248287B1
    • 2001-06-19
    • US09449676
    • 1999-11-30
    • Kiyoshi HirakawaAkitoshi MaedaHiroaki SugiyamaManabu Ohhori
    • Kiyoshi HirakawaAkitoshi MaedaHiroaki SugiyamaManabu Ohhori
    • C21D900
    • C21D1/30C21D1/26C21D1/40C21D1/42C21D1/673C21D9/40F16C33/30Y02P10/253Y10S148/906
    • In a corrective tempering method and apparatus for a rolling element in which the thermal deformation of the rolling element is corrected within an extremely short time by utilizing plasticity exhibited during a metallic structure transforming process brought about by low-temperature tempering of the rolling element made of steel, the hardened rolling element is heated and pressured to a maximum temperature within a range of from 250 to 500° C. by a heating device while set in correcting molds to correct the deformation of the rolling element at a degree of working within a range not exceeding an elastic deformation range of the rolling element at a room temperature. The rolling element can be heated also by an induction heating device in addition to a conduction heating device. A product whose inner/outer diameter correcting degree of deformation is 60% or more, dimension standardizing rate is 30% or more, surface roughness is less than Ra 0.2 &mgr;m, and surface hardness is HRC 56 or more can be obtained for a correction time within 6 minutes and an induction heating time within 30 seconds.
    • 在一种用于滚动元件的矫正回火方法和装置中,通过利用在通过低温回火引起的金属结构转化过程中所发生的塑性,在极短的时间内校正滚动元件的热变形, 通过加热装置将淬火的滚动元件加热并加压到250-500℃的最高温度,同时设置在校正模具中以在一定范围内的加工程度校正滚动元件的变形 在室温下不超过滚动体的弹性变形范围。 除了传导加热装置之外,滚动体也可以通过感应加热装置加热。 其外径矫正度的变形量为60%以上,尺寸标准化率为30%以上,表面粗糙度小于Ra0.2μm,并且可以获得表面硬度为HRC 56以上的校正时间 在6分钟内,感应加热时间在30秒以内。