共查询到16条相似文献,搜索用时 125 毫秒
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根据振动切削机理对超声振动钻削和普通钻削进行了分析和比较,设计出一种在摇臂钻床上加工小直径深孔的超声轴向振动钻削装置.并分析了超声振动钻削装置设计中的一些关键技术问题,为在摇臂钻床上加工小直径深孔提供了一种新的工艺方法. 相似文献
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Feasibility study of the ultrasonic vibration assisted drilling of Inconel superalloy 总被引:4,自引:0,他引:4
Y.S. Liao Y.C. Chen H.M. Lin 《International Journal of Machine Tools and Manufacture》2007,47(12-13):1988-1996
The ultrasonic vibration assisted drilling of Inconel 718 superalloy is studied in this paper. The tool holder of a machining center is retrofitted so that axial resonant vibration can be provided. Experimental results show that the chip size is reduced, and the variation of torque in drilling becomes smaller. These phenomena are particularly apparent at the final stage of a drill's usable life. It is also found that there is little improvement in drilling performance when the frequency of the ultrasonic vibration is varied. On the contrary, a drill's life is greatly increased when the vibration with a smaller amplitude is applied. But too large a vibration amplitude, such as over 12 μm in this study, could lead to negative effects. For the testing conditions, the frequency of 31.8 kHz and the amplitude of 4 μm result in the best drill life and quality of the drilled hole in this study. Under this condition a drill's life is prolonged by as much as 2.7 times of that without vibration assisted drilling process. Concerning drilling efficiency, it is found that by applying ultrasonic vibration assisted drilling, lifting of the drill for chip removal as commonly employed in conventional drilling of a high aspect ratio hole is not necessary, and saving of the working time is obtained. 相似文献
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为了探究GH4169合金低周疲劳试样加工过程中表面残余应力的变化及残余应力对低周疲劳性能的影响,采用X射线衍射法对“车 磨 抛”不同加工工艺的试样表面残余应力进行表征及对成品试样进行残余应力层深度测试,通过中子衍射法对试样内部进行残余应力测试。采用电液伺服万能试验机进行了低周疲劳试验。结果表明:GH4169合金低周疲劳试样加工表面残余应力随着切削量的增加由表面残余压应力变为残余拉应力。根据残余应力层深度测试,机加工对试样表面造成残余应力层深度小于0.01 mm,内部残余拉应力减小;根据疲劳试验结果,GH4169合金疲劳寿命与表面轴向残余压应力呈正相关关系。 相似文献
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为了探究GH4169合金低周疲劳试样加工过程中表面残余应力的变化及残余应力对低周疲劳性能的影响,采用X射线衍射法对“车 磨 抛”不同加工工艺的试样表面残余应力进行表征及对成品试样进行残余应力层深度测试,通过中子衍射法对试样内部进行残余应力测试。采用电液伺服万能试验机进行了低周疲劳试验。结果表明:GH4169合金低周疲劳试样加工表面残余应力随着切削量的增加由表面残余压应力变为残余拉应力。根据残余应力层深度测试,机加工对试样表面造成残余应力层深度小于0.01 mm,内部残余拉应力减小;根据疲劳试验结果,GH4169合金疲劳寿命与表面轴向残余压应力呈正相关关系。 相似文献
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采用恒压力堆积磨料砂带磨削方法对GH4169镍基高温合金进行磨削,能够实现磨削过程的压力控制,减少磨削过程中切削力的变化对磨削特性的影响。通过正交实验法对镍基高温合金材料试件进行磨削实验,根据极差分析结果得到了材料表面粗糙度的最优磨削工艺参数。实验结果表明:当磨削压力为60 N、振动频率为1 Hz、砂带线速度为34 m/s时,表面粗糙度Ra为0.072 μm,达到最优值。同时,这也验证了该方法在磨削GH4169高温合金时的可行性,为生产中磨削参数的选择提供了实验依据。 相似文献