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档碗为手推车关键零件,服役中受接触压应力的长期反复作用,易产生疲劳破坏。检验标准中规定,档碗与滚珠装配后,在650kgf压力和130r/min转速下运行3×10~6转,滚道上无明显剥落为合格。我厂档碗采用20钢制造,热处理工艺为:920×5h气体渗碳→直接淬火→180℃×1.5h回火。热处理后渗碳层深度,档为0.6～0.85mm,碗为0.5～0.8mm,硬度HRC58～62,但部分档碗接触疲劳寿命不合格。为此,我们试用滴注式碳氮共渗工艺,取得满意效果。
Bowl is a key part of the trolley, the service by the contact pressure of the long-term repeated stress effects, easy to produce fatigue damage. Inspection standards, file bowl and ball assembly, the 650kgf pressure and 130r / min speed running 3 × 10 ~ 6 revolutions, the raceway no obvious flaking qualified. I plant file bowls made of 20 steel, heat treatment process: 920 × 5h gas carburizing → direct quenching → 180 ℃ × 1.5h tempering. Carburized depth of heat treatment, the file is 0.6 ~ 0.85mm, 0.5 ~ 0.8mm bowl, hardness HRC58 ~ 62, but part of the bowls contact fatigue life unqualified. To this end, we try drip-type carbonitriding process, and achieved satisfactory results.