论文部分内容阅读
内燃机车高强度螺纹连接件的材料为18CrNi-WA和42CrMo,经热处理硬度达HRC33～40,螺纹精度为4级、强度为σ_h≥95～110kgf/mm~2,螺纹规格分别为M22～M48,要求滚压制造。被滚压螺纹件毛坯的硬度在HRC37以上,超出了一般滚压的硬度范围。当滚压毛坯的硬度为HRC30左右时,滚丝轮的寿命只相当于滚压螺纹硬度HRC20以下时的1/5～1/10。一般被滚制螺纹的直径不大于φ40mm。为了对规格为M48×2-h4的螺纹实现滚压制造(毛坯硬度HRC33～40),我们经过反复试验研究,完善了滚压工艺,达到了预期效果。
High strength threaded connections for diesel locomotive materials 18CrNi-WA and 42CrMo, the heat treatment of HRC33 ~ 40, the thread accuracy of 4, the intensity of σ_h ≥ 95 ~ 110kgf / mm ~ 2, the thread specifications were M22 ~ M48, Rolling manufacturing requirements. The hardness of rolled blanks is above HRC37, which exceeds the hardness range of general rolling. When the hardness of the rolling blank is about HRC30, the life of the rolling wheel is only 1/5 to 1/10 of the rolling thread hardness HRC20 or less. The general diameter of the rolling thread is not greater than φ40mm. In order to achieve the specification of M48 × 2-h4 thread rolling manufacturing (rough hardness HRC33 ~ 40), after repeated trial and study, we improved the rolling process, to achieve the desired results.