微晶云母陶瓷微型拉瓦尔喷管的超声加工关键技术  

Critical techniques of ultrasonic machining for micro Laval-nozzles of microcrystalline-mica-ceramics

作　　者：王丹[1] 吴杰[1] 顾琳[1] 康小明[1] 韦红雨[1] 赵万生[1] 

机构地区：[1]机械系统与振动国家重点实验室,上海交通大学机械与动力工程学院,上海200240

出　　处：《固体火箭技术》2010年第6期698-702,共5页Journal of Solid Rocket Technology

基　　金：国家自然科学基金重点项目(50635040);国家863项目(2006AA04Z332)

摘　　要：将微细超声加工方法与微细电火花加工方法相结合,解决了微晶云母陶瓷的微型拉瓦尔喷管加工中的关键技术问题,其中包括高精度多功能特种加工系统、微细超声工具的制备、工件的装夹与定位、超声加工工艺流程的设计及超声加工参数的选择。在自行研制的高精度多功能加工系统上,采用微细超声加工方法加工微晶云母陶瓷微型拉瓦尔喷管,采用微细电火花加工方法制备相应的超声加工工具,并且设计了工件夹持装置,将重复定位精度控制在2μm以内。此外,通过2套工艺流程方案的加工对比实验,选择出较优的加工方案,成功加工出入口直径为360μm、出口直径为320μm、喉部直径为170μm、总长为550μm的拉瓦尔喷管。Micro-ultrasonic-machining（micro-USM） and micro electrical discharge machining（micro-EDM） were jointly used to resolve the critical problems of micro Laval-nozzle machining techniques of microcrystalline-mica-ceramic（MCMC）,including a special machine with high precisions and multiple functions,the preparation of micro-USM tools,the clamping and locating of workpieces,the design of micro-USM process and the selection of the micro-USM conditions.Though a self-developed high-precision multi-functional machine tool,micro-USM was adopted to machine micro Laval-nozzles of MCMC cooperated with micro-EDM for tools preparation.Workpiece holding devices were designed to keep the repeat positioning accuracy less than 2 μm.Furthermore,by comparing two machining processes,a Laval-nozzle was successfully made by the better machining process with an inlet diameter of 360 μm,outlet diameter of 320 μm,throat diameter of 170 μm and total length of 550 μm.

关 键 词：微喷管 微细超声加工 微细电火花加工 微晶云母陶瓷 微推力器 

分 类 号：V431[航空宇航科学与技术—航空宇航推进理论与工程]