一,简述如何检修曲轴

2025-03-15 06:51:02
推荐回答(1个)
回答1:

汉润齿轮传动曲轴的检验主要包括裂纹的检验、变形的检验和磨损的检验。
(1)裂纹的检修。曲轴清洗后,首先应检查有无裂纹。可用磁力探伤器或染色渗透剂进行裂纹的检验。若曲轴检验出裂纹,一般应报废更换。
(2)曲轴弯曲的检修。检验弯曲变形应以两端主轴颈的公共轴线为基准,检查中间主轴颈的径向圆跳动误差。检验时,将曲轴两端主轴颈分别放置在检验平板的V型块上,将百分表触头垂直地抵在中间主轴颈上,慢慢转动曲轴一圈,百分表指针所示的最大摆差,即中间主轴颈的径向圆跳动误差值,若大于0.15mm,则应进行压力校正。低于此限,可结合磨削主轴颈予以修正。
曲轴弯曲变形的校正,一般可采用冷压校正法或敲击校正法。
冷压校正是将曲轴用v型铁架住两端主轴颈,用油压机沿曲轴弯曲相反方向加压。由于钢质曲轴的弹性作用,压弯量应为曲轴弯曲量的10~15倍,并保持2min~4min,为减小弹性后效作用,最好采用人工时效法消除。人工时效处理,即在冷压后,将曲轴加热至573K~773K,保温O.5h~1h,便可消除冷压产生的内应力。
(3)曲轴扭曲变形的检修。曲轴扭曲变形的检验是将连杆轴颈转到水平位置上,用百分表分别确定同一方位上两个轴颈的高度差。这个高度差即为扭曲变形量。
曲轴若发生轻微的扭曲变形,可直接在曲轴磨床上结合对连杆轴颈磨削时予以修正。曲轴扭曲变形的校正可采用液压扳杆扭转校正法。
(4)曲轴轴颈磨损的检修。对经探伤检查而允许修复的曲轴,必须再进行轴颈磨损量的检查:先检视轴颈有无磨痕和损伤,再测量主轴颈和连杆轴颈的圆度误差和圆柱度误差。对曲轴短轴颈的磨损以检验圆度误差为主,对长轴颈则必须检验圆度和圆柱度误差

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