【作者】 霍树青；

【导师】 高长水；

【作者基本信息】 南京航空航天大学 ， 机械制造及其自动化， 2009， 硕士

【摘要】 在难加工材料和精密加工中,功率超声加工技术具有普通加工无法比拟的工艺效果,将超声加工和其他加工方法相结合进行复合加工,常常能大幅度地提高加工速度、提高加工质量和完成一般加工方法难以完成的加工工作。因此,被广泛地应用于国民经济的各部门,并有广阔的应用前景。本课题针对功率超声加工技术在复合加工中的应用,设计一套超声加工系统。运用分块设计的方法将此装置划分为超声换能器、超声变幅杆、超声发生器和匹配电路四大主要模块进行设计。超声换能器选用夹心式压电换能器结构,运用频率方程和等效电路法进行换能器材料的选择和结构尺寸的设计;超声变幅杆选用阶梯形变幅杆结构,运用半波长变幅杆设计方法进行结构和尺寸的设计;超声发生器的设计采用他激式电路结构,选择相应的功能模块和元器件,完成电路的设计;匹配电路运用变压器进行阻抗匹配,提出耦合式变压器匹配的方法,并设计变压器的各项参数,同时计算所需感性元件的数值,用以补偿压电换能器的容性阻抗。在各部分模块设计完成后,运用阻抗分析仪进行振动系统性能的检测,确保其符合设计要求;对电路部分进行相应测试,确保其输出有效的电振荡信号。更多还原

【Abstract】 In the area of difficult machining materials and precision machining, the power ultrasonic processing technology has technological effect that are unexampled common processing technology. If the combined machining technology by ultrasonic with other processing method is used, the processing speed and quality can be improved greatly. And the combined machining can carry the processing work that can not be carryed by other common processing method. So it is widely used in many department of national economy and has wide application prospect.The task of this subject is to design the processing equipment of ultrasonic for the use of the combined machining technology. The equipment is divided into four parts. They are ultrasonic generator, ultrasonic transducer, amplitude transformer, and matching circuit. The sandwich piezoelectric ultrasonic transducer is adopted when ultrasonic transducer is designed. Its material is chosen and its structure and dimension are designed using the frequency equation and equivalent circuit method. The stepped ultrasonic horn is adopted when amplitude transformer is designed. Its structure and dimension are designed with the method of half-wavelength design. The separately excited circuit structure is adopted when ultrasonic generator is designed. Function module and components are chosen. Then the design of circuit is completed. In the design process of matching circuit, impedance matching is performed with transformer. The method is put forward to match with coupling transformer. The parameters of transformer are calculated. And the numerical value of inductive element is calculated to compensate the capacitive load. After the design of four parts, the performance of vibration system is detected with to make sure it accords with design requirements. And the circuit is tested to make sure it can output oscillating signal.更多还原