CRH6型动车组轮对轴箱前盖螺栓拧紧方法研究

Research on Tightening Strategy of Front Cover Bolts of Wheelset Axle Box of CRH6 EMU

针对CRH6型动车组运用过程中出现的轮对轴箱前盖螺栓扭矩衰减问题,以金山铁路CRH6型动车组的动轮、拖轮对轴箱前盖组装为研究对象,制定用电动伺服智能扭矩扳手来组装CRH6型动车组轮对轴箱前盖螺栓的拧紧方法。有“两步快速拧紧法”“两步快速复拧法”“三步慢速复拧法”“四步慢速停顿复拧法”等4种,经反复试验证明,其中的“四步慢速停顿复拧法”是科学有效的。

For torque attenuation of front cover bolts of wheelset axle box appearing during the application of CRH6 EMU,taking front cover assembly of driving and towed wheelset axle box of CRH6 EMU of Shanghai Jinshan Line as research object,the assembly plan of electric servo intelligent torque wrench and the tightening plan of front cover bolt of wheelset axle box of CRH6 EMU are formulated.The tightening strategies of′two-step fast tightening′,′two-step fast re-tightening′,′three-step slow re-tightening′and′four-step slow intermitted re-tightening′are verified upon repeated tests,among which the′four-step slow intermitted re-tightening′is scientifically effective.