盾构刀盘驱动无级变速离合器摩擦副烧损失效机理的研究  

Study on Burning Failure Mechanism of Friction Couples of the Infinitive-Stage-Clutch in a Shield Machine's Cutterhead

作　　者：陈宁[1] Derek Chen 邱敏秀[3] 翁卫兵[1] 徐兴[1] 

机构地区：[1]浙江科技学院食品物流装备技术研究浙江省重点实验室,杭州310023 [2]美国佛罗里达大学工程学院,甘斯威尔32611 [3]浙江大学流体动力与机电系统国家重点实验室,杭州310027

出　　处：《现代隧道技术》2016年第5期123-130,共8页Modern Tunnelling Technology

基　　金：国家自然科学基金资助项目(61273240;50475106);国家国际科技合作专项资助项目(2013DFA31920);国家高技术研究发展计划(863计划)资助项目(2012AA101704);浙江省自然科学基金资助项目(LY14F020023;LY12F03024)

摘　　要：文章采用热传导理论,结合工程热力学方法,对由铜基粉末冶金摩擦片和22MnB5特种钢对偶片组成的300 kW级盾构刀盘驱动无级变速离合器摩擦副间的热负荷场进行了理论计算,得到了摩擦副表面产生的温度场T(r)分布、在钢对偶片表面产生的周向热应力σ_θ和径向热应力σ_r分布。仿真结果表明:T(r)、σ_θ、σ_r沿径向分布均具有明显的非均匀性;比σ_r大一个数量级的σ_θ才是钢对偶片会否产生变形的决定性因素。分析得到:理论上,当转速差△ω低于1.37πrad/s时,摩擦副将进入临界滑摩工况;反复或长时间工作于临界滑摩工况下,粉末冶金摩擦片摩擦材料层将因T(r)而产生烧焦破损,钢对偶片将因σ_θ而沿轴向产生浅碟状塑性翘曲变形。实验验证了粉末冶金摩擦片、钢对偶片烧损失效机理和形式,并给出了盾构刀盘驱动无级变速离合器设计和操作时应遵从的临界滑摩工况量化定义指标的推荐值。The thermal load field between the friction couples of the 300 kW infinitive-stage-clutch used in a shield machine＇s cutterbead, which is composed of copper-based powder metallurgy friction plates and 22MnB5 steel dual-discs, were calculated according to the heat conduction theory combined with the engineering thermody- namics method. The temperature field distribution T（r） along the friction couple＇s surfaces was obtained, as well as the week thermal stress σθ distribution and the radial thermal stress σr distribution along the radial direction of the dual-steel-disc＇s surface. Two conclusions were drawn from those distribution curves： that T（r）, σθ and σr are clearly heterogeneous in the radial direction, and that σθ , being larger than σr in an order of magnitude, should be contributed to the deformation of the dual-steel-disc. It can theoretically be concluded from further analyses that the friction couple would be under the critical sliding friction condition if the speed difference △ω falls to 1.37 π rad/s; the material layer of the powder metallurgy friction plate might be burned or damaged because of T（r） when the friction couple repeatedly runs or works for a long time under the critical sliding friction condition, and the du- al-steel-disc might be converted from a plane into a shallow dish in the axial direction as a result of σθ. By the ex- periments, the failure mechanisms and modes of the powder metallurgy friction plate and it＇s dual-steel-disc are proved and the recommended values, complying with the quantitative definition indicators under the actual critical sliding friction condition during design and operation of the infinitive-stage-clutch in the shield machine＇s cutter- head, are proposed.

关 键 词：盾构 变速离合器 临界滑摩 热负荷场 烧损失效 粉末冶金摩擦片 钢对偶片 

分 类 号：U455.31[建筑科学—桥梁与隧道工程]