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工程陶瓷超声磨削试验机床的电气控制与基础实验研究
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摘要
由于工程陶瓷材料具有的优良物理、化学性能,使它在一些特殊领域如高温、腐蚀以及易磨损等场所有着诱人的应用前景,但正是由于这些优良的性能,使得对其加工也带来了困难。目前一般采用特种加工方法例如超声磨削复合加工。
     本文对工程陶瓷的应用及其国内外超声加工概况以及陶瓷超声磨削加工设备的组成、工艺要求等作了详细的介绍。并对超声磨削加工机理进行了分析研究。在超声加工过程中,相关电气控制系统起到非常重要的作用,其性能参数的好坏,将直接影响到加工的效果甚至设备运行安全,因此对相关设备的设计研制和选购尤为重要。本文对一些重要的电气控制设备如超声电源、交流变频电机、变频器以及附属装置的结构原理、性能参数作了分析介绍。
     同时,为了实现对陶瓷进行恒转速磨削,以便达到更好的加工效果,对驱动磨轮主轴的交流变频电机采用了计算机数字闭环控制,本文在数学模型的基础之上对其进行了分析讨论。
     另外,本文在超声磨削加工中引入弹性能概念,结合断裂模型以解释课题实验中Al_2O_3工程陶瓷的超声与机械磨削加工的对比结果。
Possessing excellent performance of physics and chemistry, engineering ceramics (EC) have attractive applied foreground in some special fields of high temperature, erosive and wearing et al. But it just is the excellent performance that bring handicaps to machining it. At present, special type machining such as ultrasonic grinding machining is ordinarily used in processing engineering ceramics.
     Engineering ceramics’application and its general situation of ultrasonic machining in domestic and abroad is introduced. The composing and technical requires of engineering ceramics’ultrasonic grinding machining is detailedly introduced. The mechanism of ultrasonic grinding machining is also analyzed and researched in this article.
     The related electronic control systems play a important role in the process of ultrasonic grinding machining engineering ceramics, its parameter of performance will directly affect the effect of machining even the safety of equipment running. Therefore, it is important to design, manufacture, choose and buy related equipment. The structural principle and parameter of performance of some important electronic control equipment such as ultrasonic power supply, AC frequency conversion electromotor, transducer and their affiliated facilities are analyzed and introduced.
     At the same time, in order to grind engineering ceramics in constant rotate speed, so that the better machining effect can be achieved, the grinding axis driver—AC frequency conversion electromotor is numeric closed-loop controlled through computer, the process is analyzed based on mathematical model in this article.
     In addition, the conception of elasticity energy is introduced in the article, and it is combined with the model of fracture toughness so as to explain the contrastive results between ultrasonic and mechanical grinding machining Al2O3 engineering ceramic in experiment.
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