复频超声中自由质量块的应用及试验研究
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摘要
复频超声加工是在超声加工的基础上,通过自由质量块引入一低频振动,高、低频振动共同完成切削的加工方式。复频超声加工方法能够增大钻头输出端的冲击动应力,提高加工效率,因此是一种应用前景良好的硬脆材料加工方法。分析了复频超声振动系统的工作原理,并根据复频超声振动系统的运动特点,建立了复频超声装置加工硬脆材料的数学模型,研究了自由质量块在加工过程中的作用。陶瓷材料加工试验表明,材料去除率随着自由质量块厚度的增大而增大,且其变化幅度随厚度的逐渐增加越来越明显;很好的验证了理论分析的准确性。对比不同加工时间的试验,结果表明材料去除率的增长率随加工时间的增加而增加,说明材料去除机理遵循裂纹产生、裂纹扩展和材料去除的规律。
Multi-frequency ultrasonic machining is a high and low frequency vibration together to complete the cutting processing methods,which base on ultrasonic machining,introduce a low frequency vibration produced by free mass block. Multi-frequency ultrasonic machining method can increase the impact dynamic stress of the output end of the drill bit and improve the processing efficiency,so it is a processing method with good prospect for hard and brittle material. The principle of multi-frequency ultrasonic vibration system is analyzed. A mathematical model for processing hard and brittle materials by multi-frequency ultrasonic equipment is established by analyzing movement characteristic of multi-frequency ultrasonic vibration system. The impact of free mass block on the machining process is studied. The experiment investigations of ceramic materials show that the material removal rate increases with the increase of the thickness of the free mass block,and the variation range increases with the increase of the thickness; it verify the accuracy of theoretical analysis. Comparative experiments on different processing time show that the growth rate of the material removal rate increased with the increase of processing time,indicating that the material removal mechanism follows the law of crack generation,crack growth and material removal.
Multi-frequency ultrasonic machining is a high and low frequency vibration together to complete the cutting processing methods,which base on ultrasonic machining,introduce a low frequency vibration produced by free mass block. Multi-frequency ultrasonic machining method can increase the impact dynamic stress of the output end of the drill bit and improve the processing efficiency,so it is a processing method with good prospect for hard and brittle material. The principle of multi-frequency ultrasonic vibration system is analyzed. A mathematical model for processing hard and brittle materials by multi-frequency ultrasonic equipment is established by analyzing movement characteristic of multi-frequency ultrasonic vibration system. The impact of free mass block on the machining process is studied. The experiment investigations of ceramic materials show that the material removal rate increases with the increase of the thickness of the free mass block,and the variation range increases with the increase of the thickness; it verify the accuracy of theoretical analysis. Comparative experiments on different processing time show that the growth rate of the material removal rate increased with the increase of processing time,indicating that the material removal mechanism follows the law of crack generation,crack growth and material removal.
引文
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[3]王红飞.超声振动车削加工的研究现状及进展[J].机械设计与制造,2007(10):212-214.(Wang Hong-fei.Research of vibration assisted turning cutting technology and it,s development[J].Machinery Design&Manufacture,2007(10):212-214.)
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[7]Law,B.R.,Swain,M.V.Microfracture beneath point indentation in brittle solids.J.Master.Sci.,1975(10):113-122.
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