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《机械制造与自动化》2019,(1)
使用PCD刀具进行微细铣削硬质合金的刀具磨损试验,研究了PCD微细铣刀的磨损形态和磨损机理。结果表明,PCD微细铣刀的磨损主要集中在刀尖和底刃上,造成刀具磨损的原因主要包括粘结磨损、磨料磨损以及微崩刃。刀具磨损导致硬质合金加工表面粗糙度逐渐增大。 相似文献
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在微细加工精密微小零件的过程中,存在的主要问题之一是有微型毛刺产生。利用有限元软件Abaqus对铝2024-T3微细切削进行仿真,运用Johnson-Cook(J-C)模型建立工件材料模型,用网格自适应技术(arbitrary Lagrangian Eulerian,ALE)实现切屑和工件的分离,切屑和刀具的接触摩擦模型采用修正的库仑摩擦定律,动态模拟微型毛刺的形成过程,分析不同刀具几何参数及切削参数对毛刺形成的影响,得到微细加工过程中不同刀具几何参数及切削参数对微型毛刺形成影响的一般规律。分析结果为优化刀具几何参数及切削参数、减少微细切削中的毛刺和提高表面加工质量等提供指导。 相似文献
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通过对比聚晶金刚石(PCD)、硬质合金、立方氮化硼(CBN)刀具在微细切削铍青铜时的切削性能,研究了不同刀具微细切削铍青铜时的表面粗糙度以及表面纹理,分析了不同刀具微细切削铍青铜时的刀具磨损状况,主要包括前刀面、切削刃以及后刀面。研究表明,PCD刀具在进行微细切削时表现出优良且稳定的切削性能,不仅表面粗糙度R_a值低、切削力小,而且刀具磨损量最小;硬质合金刀具在本次试验中切削性能仅次于PCD刀具,考虑到刀具成本,硬质合金刀具具有极高的性价比;CBN刀具则由于容易产生大型的积屑瘤从而导致切削过程极不稳定,表面粗糙和切削力过大,而被证明不适合用于铍青铜材料的微细切削过程。同时对PCD刀具微细切削铍青铜的切削参数进行了优化。 相似文献
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刀具的姿态调整是确保微细切削成功实施的重要环节。本文以微细车削刀具姿态微调为目标,提出了基于图像处理的刀具在线检测方法和采用斜楔机构的刀具姿态微调技术方案。 相似文献
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分析了超微细切削加工的机理、特点及技术难点 ,并对最小切削厚度与刀具刃口圆弧半径的关系进行了量化分析。讨论了切削过程中的微振动、刀具的磨损和崩刃、材料的微量切削加工性、机床的动特性、加工环境的稳定性等因素对超微细切削过程的影响 ,并提出了解决措施。 相似文献
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APPROACHTODISPATCHINGFMSTOOLSYSTEMLiangXichang;YangYue(ChongqingUniversity)Abstract:DispatchingoptimallyFMStoolsystemcanutili... 相似文献
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E. Niemi 《The International Journal of Advanced Manufacturing Technology》2003,22(9-10):720-726
Minimisation of tool change waiting time of numerically controlled machine tools is studied for machines equipped with tool revolvers or rotating tool magazines and unbuffered tool change. The tool order in the magazine is optimised with the primary objective of minimising the time required for tool magazine rotation and tool change. Numerical experiments are conducted and their results show that optimisation of tool locations of a fixed tool position revolver or revolver type magazine is usually always useful. The optimisation is most beneficial when the magazine is large and the tool usage frequency distribution is non-uniform. Savings of 60% on waiting time are typical compared to the use of a random tool order in the magazine. A tool magazine operating method utilising empty tool slots in the magazine is examined and found to be useful. Rotating tool magazines equipped with a buffering tool changer are studied in the accompanying Part 2 of the paper. 相似文献
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According to the Taylor tool life equation, tool life reduces with increasing cutting speed. The influence of additional factors can also be incorporated. However, tool wear is generally considered a stochastic process with uncertainty in the model constants. In this work, Bayesian inference is applied to predict tool life for milling/turning operations using the random walk/surface methods. For milling, Bayesian inference using a random walk approach is applied to the well-known Taylor tool life model. Tool wear tests are performed using an uncoated carbide tool and AISI 1018 steel work material. Test results are used to update the probability distribution of tool life. The updated beliefs are then applied to predict tool life using a probability distribution. For turning, both cutting speed and feed are considered. Bayesian updating is performed using the random surface technique. Turning tests are completed using a coated carbide tool and forged AISI 4137 chrome alloy steel. The test results are applied to update the probability distribution of tool life and the updated beliefs are used to predict tool life. While this work uses the Taylor model, by following the procedures described here, the technique can be applied to other tool life models as well. 相似文献
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基于分步式数控技术的刀具信息在线追踪系统设计 总被引:1,自引:0,他引:1
结合MES对刀具在线状态的数据需要,分析了MES下刀具信息追踪技术的几个重点和难点,并对DNC技术,系统与对刀仪的集成问题结合具体车间实际情况进行了分析研究。研究了数控机床联网以及数控刀具在线信息追踪采集问题,实现了系统与对刀仪,系统与数控机床的联网并成功进行刀具信息追踪采集,在此基础上,根据企业需要,对刀具寿命进行了初步管理。 相似文献
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正交车铣高强度钢的刀具耐用度及磨损机理研究 总被引:2,自引:0,他引:2
通过TiN涂层硬质合金端铣刀正交车铣58SiMn高强度钢的刀具磨损试验,建立了刀具耐用度T-(vc,fa,fz)关系泰勒公式,分析了各切削用量对刀具耐用度的影响关系;对正交车铣刀具的磨损研究表明刀具表面材料的疲劳—剥落和切削刃微崩以及在高温下刀具材料中的元素与周围介质发生的化学反应磨损等是造成刀具磨损的主要原因。 相似文献
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Experiments and finite difference thermal modeling of the induction-heated tool for end milling of elastomers are investigated. Three sets of experiments are designed to calibrate the contact thermocouple for the tool tip temperature measurement, study the effect of tool rotational speed on induction heat generation and convective heat transfer, and measure the tool temperature distribution for finite difference inverse heat transfer solution and validation of modeling results. Experimental results indicate that effects of tool rotation on induction heat generation and convective heat transfer are negligible when the spindle speed is below 2000 rpm. A finite difference thermal model of the tool and insulator is developed to predict the distribution of tool temperature. The thermal model of a stationary tool can be expanded to predict the temperature distribution of an induction-heated rotary tool within a specific spindle speed range. Experimental measurements validate that the thermal model can accurately predict tool tip peak temperature. 相似文献