Reasearch On Mechanism And System Of Ultrasound-assisted Drilling And Milling

Machining is an important modern manufacturing base of the national economy, national defense construction and high-tech and other related areas have a huge impact, has been subject to academic and engineering universal attention. In recent years, with the level of technology advances, the expansion of the scope of application of object-oriented diversification and process performance and processing results high standards, whether mechanical processing methods and techniques, or mechanical processing equipment, have been rapidly development, especially special structures and components as well as increasingly strong demand for emerging new materials and extensive application of machining technology put forward higher requirements. Therefore, the development of traditional processing techniques, while some of the special processing methods have emerged, greatly enriched the content of machining technology and content, including ultrasound-assisted processing technology With Green, fine and efficient features, highly valued by the industry, became brittle materials machining the principal means. However, ultrasound-assisted machining technology turning, grinding and drilling milling and other forms, is currently in the process of ultrasonic milling copy main principle of shape, copy the shape of the tool on the workpiece, there is a great tool wear, machining efficiency is low, machined surface integrity and flexible manufacturing capabilities bad and poor, it is difficult for complex cavity processing applications. To this end, we propose to carry out ultrasound-assisted rotary drilling and milling mechanism and system. Ultrasound assisted in the establishment of the mechanical rotary drilling and milling machining mechanism model, and clearly related, based on the design and development of a set of ultrasound-assisted rotary drilling milling head and drive modules, focused on solving the ultrasonic energy amplification, coupled ultrasonic excitation signal transmission and non-contact ultrasonic Operating frequency online auto tracking adjustment and other key issues, to ensure ease of application and processing head coupled with high-precision machine tool rotary motion at the same time, given its optimal ultrasound-assisted machining capabilities for complex brittle materials processing to provide a flexible structure technical means. Specific studies include:The first chapter, Discussion on the influence of hard and brittle materials of modern industry as well as the significance of the research on ultrasonic vibration assisted machining technology, research status and development trend of the technology system, there are clear drilling milling technology problems with ultrasound assisted, pointed out the direction for the study of this paper, and the research contents and chapters arrangement.The second chapter, Combined with the characteristics of hard and brittle materials, according to the theory of fracture mechanics, ultrasonic auxiliary drilling and milling mechanical model, analyzes the processing mechanism, the factors affecting the rate of material removal and surface integrity, laid the theoretical foundation for the follow-up study is necessary.The third chapter, in determining the ultrasound-assisted drilling milling head and drive modules on the basis of the overall program were designed based on the rotating plate capacitor coupled non-detection ultrasonic excitation signal transmission device, the ultrasonic signal energy amplification mechanism and coupled with the tool spindle clamping mechanism, realizing ultrasound-assisted rotary drilling milling machine body development. Meanwhile, DSP-centric control unit, using DDS technology to generate operating parameters programmable adjustable ultrasonic excitation signal, and the signal is loaded on to the ultrasound transducer is optimized to maximize the active power indicator achieve ultrasonic frequency automatic tracking, ensure that process in the best working condition, the development of a digital ultrasound assisted rotary drilling and milling driver modules.The fourth chapter, The above development drilling and milling and CNC machine tool line drive module, integrated set of ultrasound-assisted drilling and milling systems. And conduct experimental study hard and brittle materials processing, experimental results reflect the auxiliary drilling and milling characteristics, confirmed the feasibility and effectiveness of the technology and research devices mentioned herein.The fifth chapter, the conclusion and prospect. To sum up the full text, and looks forward to the next research work.