共查询到20条相似文献,搜索用时 203 毫秒
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振动攻丝扭矩动态信号的研究 总被引:2,自引:0,他引:2
用快速傅里叶变换方法针对振动攻丝扭矩测量信号进行频谱分析,并采用数字信号滤波技术对各组成信号进行提取.信号分析结果表明:测量信号中主要包括扭矩信号及径向跳动信号;扭矩信号的频率与外加振动频率相一致,径向跳动信号随攻丝过程的持续进行逐渐变大.攻丝扭矩信号分析为振动参数对振动功丝扭矩影响规律的研究提供依据. 相似文献
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用微机控制振动攻丝(上) 总被引:4,自引:0,他引:4
手动攻丝时,丝锥在加工过程中要进、退、进、退反复地进行。手动攻丝虽不易折断丝锥,又能保证攻丝质量,但工效很低,对要求较高的螺孔,采用普通手动攻丝的方法,加工精度和表面粗糙度也不易达到要求。故而模拟上述手动攻丝的方法,就产生了振动攻丝的方法。振动攻丝即在攻丝时人为地在丝锥和工件的相对运动方向上叠加一个振动。 相似文献
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低频振动攻丝提高加工精度的试验研究 总被引:1,自引:0,他引:1
根据振动理论对低频振动攻丝提高加工精度的动力学机理进行了理论分析和试验研究 ,阐明了低频振动攻丝时丝锥扭转振动的动力学特性。 相似文献
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难加工材料的低频振动攻丝研究 总被引:10,自引:0,他引:10
针对航空难加工材料的攻丝难题。在分析振动与普通攻丝切屑形成过程的基础上,应用动力学、弹塑性和冲击理论系统地研究了振动攻丝降低扭矩的机理。试验表明:振动攻丝具有刚性化、抑制表面回弹和冲击等作用,不仅可以大幅度降低攻丝扭矩,而且能够显著提高螺纹的加工质量。 相似文献
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Relief-face friction in vibration tapping 总被引:1,自引:0,他引:1
One of the key problems in the tapping process for difficult-to-cut materials such as titanium alloys is that the relief-face friction of the tap is very large. In this paper, the vibration tapping process, in which the spring-back of the machined surface can be removed, has been analyzed with elasto-plasticity. Thus the reason why vibration tapping can reduce the tapping torque has been explained qualitatively, and a theoretical basis for choosing reasonable values for the cutting parameters for vibration tapping has been provided. The theoretical analysis shows good agreement with the experimental results obtained when tapping a titanium alloy. 相似文献
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利用DEFORM-3D有限元数值模拟软件对内螺纹的振动挤压进行了模拟.分析了影响振动挤压攻丝扭矩主要因素,基于模拟结果揭示出各主要因素对攻丝扭矩的影响及其变化的基本规律.这些规律对减小扭矩、提高内螺纹质量、改善攻丝效果都有一定理论和实践指导意义. 相似文献
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Transient dynamics of tapping mode atomic force microscope (AFM) for critical dimension measurement are analyzed. A simplified nonlinear model of AFM is presented to describe the forced vibration of the micro cantilever-tip system with consideration of both contact and non-contact transient behavior for critical dimension measurement. The governing motion equations of the AFM cantilever system are derived from the developed model. Based on the established dynamic model, motion state of the AFM cantilever system is calculated utilizing the method of averaging with the form of slow flow equations. Further analytical solutions are obtained to reveal the effects of critical parameters on the system dynamic performance. In addition, features of dynamic response of tapping mode AFM in critical dimension measurement are studied, where the effects of equivalent contact stiffness, quality factor and resonance frequency of cantilever on the system dynamic behavior are investigated. Contact behavior between the tip and sample is also analyzed and the frequency drift in contact phase is further explored. Influence of the interaction between the tip and sample on the subsequent non-contact phase is studied with regard to different parameters. The dependence of the minimum amplitude of tip displacement and maximum phase difference on the equivalent contact stiffness, quality factor and resonance frequency are investigated. This study brings further insights into the dynamic characteristics of tapping mode AFM for critical dimension measurement, and thus provides guidelines for the high fidelity tapping mode AFM scanning. 相似文献
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振动攻丝作为一种加工小直径内螺纹的特种加工方法,有广泛的应用前景。本文介绍了同步进电机控制振动攻丝的攻丝机的实时控制和数据采集系统,并给出了部分核心程序。 相似文献
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高强度钢大直径内螺纹的冷挤压加工 总被引:2,自引:0,他引:2
高强度钢大直径内螺纹冷挤压加工是一种新型的抗疲劳制造技术。本文介绍了300M 内螺纹冷挤压成形特点,分析了冷挤压加工机理,并对冷挤压加工过程中扭矩变化规律进行了实验研究。 相似文献
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根据钛合金的性能,分析了钛合金攻丝的难加工性及挤压攻丝代替切削攻丝的可行性,并在此基础上研制了适应于难加工材料小螺纹攻丝的复合振动挤压攻丝机。新型振动攻丝机采用数控技术,实现了攻丝靠模通用化,具有周向和轴向振动功能,满足振动挤压攻丝新工艺的要求。 相似文献