共查询到19条相似文献,搜索用时 125 毫秒
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陆胜凯 《机械工程与自动化》2022,(6):52-53
Al2O3陶瓷是一种典型硬脆材料,采用普通钻削制孔方法很难保证良好的表面质量,而低频振动钻削可显著改善加工效果。将轴向振动应用于工程陶瓷钻削,运用单因素试验法,设计传统钻削(TD)与低频振动钻削(LFVD)的对比试验,以加工后孔壁粗糙度值作为评价加工质量的指标,对低频振动钻削和传统钻削对钻削质量的影响规律进行了研究;并进一步探究了低频振动钻削的振幅、进给速度、主轴转速对钻削质量影响的规律。结果表明:相比于传统钻削加工,低频振动钻削加工能够提高钻削质量;孔壁粗糙度随低频振动钻削加工振幅、主轴转速的提高而减小,随进给速度的提高而增大;传统钻削的主轴转速和进给速度对孔壁粗糙度的影响与低频振动钻削的规律相似。 相似文献
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《中国机械工程》2010,(22)
基于复合制冷技术研制了一种低温最小量润滑供给装置,在低温最小量润滑(cryogenic minimum quantity lubrication,低温MQL)条件下进行高速铣削钛合金试验,研究了低温MQL对刀具与工件材料的摩擦接触状态、刀具磨损及已加工表面粗糙度的影响。将测量的铣削分力转化为切向铣削力和径向铣削力,以分析高速铣削时刀具与工件材料的摩擦接触状况。研究结果表明:低温MQL可使峰值径向铣削力减小27.6%~34.3%,有效地改善了刀具与工件材料的摩擦接触状态;降低低温MQL的温度有益于微量润滑油润滑功能的发挥并改善刀具与工件材料的摩擦接触状态,可延长刀具寿命,减小已加工表面粗糙度,但效果不明显;低温MQL的良好润滑作用可有效延长高速铣削钛合金时刀具的寿命。 相似文献
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基于复合制冷技术研制一种低温最小量润滑供给装置,分析低温最小量润滑切削的冷却润滑作用,通过干切削、常温冷风、最小量润滑(Minimum quantity lubrication,MQL)、低温冷风、低温最小量润滑(低温MQL)5种冷却润滑条件下高速车削钛合金的切削温度、切削力对比试验,研究低温MQL在高速车削中的冷却润滑性能。结果表明,5种冷却润滑条件中,低温MQL能够最有效降低切削温度,且随着切削速度的提高,其降低切削温度的效果更明显;低温MQL优异的冷却效果有益于微量润滑油润滑作用的发挥,使其对切削区的润滑效果优于MQL,有效地降低高速车削钛合金时的切削力,改善刀具前刀面摩擦状况。 相似文献
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ABSTRACT Minimum Quantity Lubrication (MQL) is a near-dry machining method that may be applied to reduce coolant usage in operations such as drilling, which cannot be performed completely dry. Although significant research has been reported on MQL, relatively little information on production applications and experience has appeared in the technical literature. The most common high-volume production application for MQL is cross and oil hole drilling on steel crankshafts. This paper reviews MQL test results for deep hole drilling of forged steel and cast nodular iron under conditions similar to crankshaft oil hole drilling. The results show that MQL can yield tool life equivalent to gun drills at higher penetration rates under these conditions. This result is consistent with production experience with steel crankshafts, and shows that MQL may also be useful for cross and oil hole drilling of cast crankshafts. Limited test and production data for MQL machining of aluminum prismatics is also described. Significant areas for future research and development, including chip management, air quality, capability and robustness, and cost are also discussed. 相似文献
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Minimum Quantity Lubrication (MQL) is a near-dry machining method that may be applied to reduce coolant usage in operations such as drilling, which cannot be performed completely dry. Although significant research has been reported on MQL, relatively little information on production applications and experience has appeared in the technical literature. The most common high-volume production application for MQL is cross and oil hole drilling on steel crankshafts. This paper reviews MQL test results for deep hole drilling of forged steel and cast nodular iron under conditions similar to crankshaft oil hole drilling. The results show that MQL can yield tool life equivalent to gun drills at higher penetration rates under these conditions. This result is consistent with production experience with steel crankshafts, and shows that MQL may also be useful for cross and oil hole drilling of cast crankshafts. Limited test and production data for MQL machining of aluminum prismatics is also described. Significant areas for future research and development, including chip management, air quality, capability and robustness, and cost are also discussed. 相似文献
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A study of the effect of palm oil as MQL lubricant on high speed drilling of titanium alloys 总被引:2,自引:0,他引:2
The main objective was to study the potency of MQL palm oil (MQLPO) as a lubricant in the high speed drilling of Ti-6Al-4V. For the comparison, MQL synthetic ester (MQLSE), air blow and flood conditions were selected. Uniform flank wear, micro-chipping, thermal cracking and flaking were the dominant tool failure modes. It was found that MQLSE and MQLPO gave comparable performance with the flood conditions. In addition, MQLPO outperformed MQLSE on the cutting forces, temperature, power and specific cutting energy. This shows that palm oil can be used as a viable alternative to synthetic ester for MQL lubricant. 相似文献
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Minimum Quantity Lubrication (MQL) machining involves the application of a minute amount of an oil-based lubricant to the machining process in an attempt to replace the conventional flood coolant system. Understanding the correlations between fluid properties and MQL performance can help in selecting lubricants from a variety of choices without going through extensive machining tests. This study compared nine different MQL fluids in terms of their physical properties, wettability, tribological properties (lubricity and extreme pressure (EP) properties), mist characteristics and machinability to determine the correlation of measured properties and MQL drilling and reaming performance. Results show that low fluid viscosity, high mist concentration, large mist droplet diameter and high wettability were best correlated with good machinability. Although it is difficult to draw strong relationships, the optimal machining in a mild cutting condition was found with the low viscosity fluids, which may also have the highest mist concentration, largest drops and best wettability. 相似文献
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《Measurement》2016
The present work shows an experimental investigation on intermittent turning based on vibration signals. The dependence of vibrations on the feed rate, minimum quantity lubrication (MQL) flow rate and the type of the interruption of the workpiece is evaluated. The results indicate that a part of the vibrations depends on the flow rate of the MQL system and its interaction with the feed rate, finding no dependency on the type of interruption. The influence of the MQL system is greater when machining at the lower feed rate. In addition, a strong relation between surface roughness and vibrations is identified. However, this relation is quite different depending on the environment used. In general, under dry conditions, the higher the vibrations the higher the surface roughness, while the opposite occurs when the MQL system is used. 相似文献
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微细深孔超声轴向振动钻削装置的设计 总被引:1,自引:0,他引:1
超声振动钻削属于脉冲式的断续切削。在深孔加工方面具有普通孔加工技术无法比拟的工艺效果。文章介绍了作者基于高频振动切削原理设计的一台超声轴向振动钻削装置的结构。并将该装置用于立式加工中心上对铝、铜等材料进行了切削加工实验。实验结果表明,超声振动加工可提高微细深孔的加工精度和表面质量。这种方法特别适合于软质材料的微细深孔的精密和超精密加工。 相似文献
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高温合金振动钻削断屑实验研究及机理分析 总被引:1,自引:0,他引:1
对振动钻削理论进行了分析,建立了振动钻削时断屑的数学模型,利用自制的振动钻削实验装置,采用不同的振动钻削参数进行高温合金振动钻削试验,对轴向振动钻削的断屑效果以及轴向钻削力和扭矩进行了研究,分析了各加工参数对加工过程的影响,发现振动钻削力随钻削参数的变化比较平稳,在大进给量或高转速状态下,振动钻削的钻削力比普通钻削力小得多。通过比较振动钻削与普通钻削所得切屑可知:振动钻削有利于断屑,切屑体积小,排屑顺畅。 相似文献