摘要
为实现确定磨盘的磨削深度控制,减少加工中不同粒度工具的更换次数从而提高加工效率,流体动压状态下的固结磨料加工工艺第一次被提出。在完成磨盘表面形貌建模的基础上,以磨盘和工件间隙中的磨削液膜为研究对象,建立了瞬态等温条件下的流体润滑方程,并利用显示有限差分算法求得数值解。计算结果表明:通过调节动压力来控制磨削深度是可行的,因为液膜动压力随磨盘最大磨削深度的减小而有明显的上升趋势,分布也趋于平坦;提高入口压力时,动压力明显增大,但也加剧了其分布的不均匀性;因为受制于磨盘表面形貌以及加工质量要求,转速对动压力的影响并不显著。
Mixed contact fixed abrasive processing was proposed in this paper for controlling the grinding depth of a definitive tool and decreasing the tool switches frequency for the first time.Thus the machining efficiency can be significantly improved.The transient isotherm hydrodynamic lubrication equations of the liquid membrane between the tool and workpiece were established.Then explicit difference algorithm was adopted.The numerical simulation was conducted to analyze the hydrodynamic pressure and its distribution.The feasibility of controlling the grinding depth by the liquid membrane ′ s hydrodynamic pressure was confirmed by the results.Because the hydrodynamic pressure increases with decreasing maximum grinding depth and its distribution becomes flat.The hydrodynamic pressure obviously increases with the inlet pressure,while its distribution becomes uneven.The influence of the rotational speed is inconspicuous,because of the grinding tool surface topography and the processing quality demand.
出处
《红外与激光工程》
EI
CSCD
北大核心
2014年第12期4006-4012,共7页
Infrared and Laser Engineering
基金
国家科技重大专项"大口径非球面机器人数控抛光系统研制"课题(2013ZX04006011-207)
关键词
流体动压磨削
固结磨料
表面形貌建模
流体润滑
hydrodynamic grinding
fixed abrasive
modeling of topography
hydrodynamic lubrication
