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钛合金整体结构件高效插铣工艺实验研究 总被引:1,自引:0,他引:1
针对钛合金整体结构件粗加工的插铣和侧铣工艺,从切削力、切削稳定性、切削温度等方面进行了切削实验和分析对比。实验结果表明,在相同切除率条件下,插铣的轴向切削力略大于侧铣的轴向切削力,而插铣作用力仅为侧铣的1/3%;随着切削深度的增加,插铣刀具的振动比侧铣刀具的振动小,且切削过程稳定;
插铣的切削温度要比侧铣的切削温度低。最后,以TC4钛合金整体叶盘通道开槽为例,进行了插铣验证。验证结果表明,插铣切削过程稳定,效率比侧铣提高了近1倍,刀具成本仅为侧铣的13%。 相似文献
插铣的切削温度要比侧铣的切削温度低。最后,以TC4钛合金整体叶盘通道开槽为例,进行了插铣验证。验证结果表明,插铣切削过程稳定,效率比侧铣提高了近1倍,刀具成本仅为侧铣的13%。 相似文献
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针对未考虑正偏心正交车铣切削层几何形状而导致难以全面反映正交车铣切削层几何形状变化规律的问题,基于正交车铣运动规律,在不考虑动力学影响的情况下,对切削层的形成过程进行了静态分析。建立的正偏心正交车铣切削层几何形状的解析模型涉及铣刀侧刃和底刃的切入/切出角度、切削厚度和切削深度。通过试验验证了该解析模型的正确性,并分析了切削参数对铣刀切削层的影响。研究结果为正偏心正交车铣切削层几何形状的变化提供了定量的分析依据,为切削力和颤振的研究提供了理论指导。 相似文献
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通过对TC4钛板上钻削?0.1mm微孔的研究,建立了一种能够精确预测钻头所受钻削力的切削力模型。利用解析法分别将主切削刃和横刃离散成一系列斜角切削单元和直角切削单元;应用Deform软件,并充分考虑微细加工中特有的尺寸效应,模拟出每个单元所受的力;建立切削单元的局部坐标系与整个钻头的整体坐标系,将每个切削单元所受的力转化为整个钻头所受的力,进而求出整个钻头的轴向力与扭矩。通过多组工艺参数的仿真与实验,表明该切削力模型能够比较精确地测出微钻削过程中的钻削力。 相似文献
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基于对称模糊数及径向基网络的切削力预测研究 总被引:3,自引:0,他引:3
提出基于对称模糊数的切削力模糊预测模型以及基于径向基网络的切削力神经预测模型。通过分析这两种模型的有效性、特点及适用范围,并与常用的最小二乘回归模型相比较。为金属翅纤维连续切削成形的切削力预测与控制提供参考。 相似文献
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Gabriel R. Frumu?anu Alexandru Epureanu Ionu? C. Constantin 《The International Journal of Advanced Manufacturing Technology》2012,58(1-4):29-43
Nowadays, approaches in chatter detection and control are based on chatter prediction, by using a machining system dynamic model, or on chatter detection by different techniques, but after chatter onset. They are not efficient because the models are complicated and specific (in the first case) respectively because of chatter unwanted consequences occurrence (in the second case). This paper presents a method for early detection of the process regenerative instability state (as a specific process current dynamical state), based on cutting force monitoring. Using the cutting force records, the process current dynamical state is assessed. Appropriate cutting force signal features are defined, based on signal statistic processing, signal chaotic modeling or signal harmonic analysis, and used on this purpose. The process dynamical state evolution is modeled aiming the features values prediction. Two types of models were used in this purpose: linear and neural. The instability regenerative mechanism is identified by using either dedicated features or input variable selection. The method was conceived and experimentally implemented in the case of turning process. The results show the method reliability and the possibility of using it in developing an intelligent system for stability control. 相似文献
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Somkiat Tangjitsitcharoen Haruetai Lohasiriwat 《The International Journal of Advanced Manufacturing Technology》2018,99(9-12):2219-2230
In order to realize an intelligent CNC machine, this research proposed the in-process tool wear monitoring system regardless of the chip formation in CNC turning by utilizing the wavelet transform. The in-process prediction model of tool wear is developed during the CNC turning process. The relations of the cutting speed, the feed rate, the depth of cut, the decomposed cutting forces, and the tool wear are investigated. The Daubechies wavelet transform is used to differentiate the tool wear signals from the noise and broken chip signals. The decomposed cutting force ratio is utilized to eliminate the effects of cutting conditions by taking ratio of the average variances of the decomposed feed force to that of decomposed main force on the fifth level of wavelet transform. The tool wear prediction model consists of the decomposed cutting force ratio, the cutting speed, the depth of cut, and the feed rate, which is developed based on the exponential function. The new cutting tests are performed to ensure the reliability of the tool wear prediction model. The experimental results showed that as the cutting speed, the feed rate, and the depth of cut increase, the main cutting force also increases which affects in the escalating amount of tool wear. It has been proved that the proposed system can be used to separate the chip formation signals and predict the tool wear by utilizing wavelet transform even though the cutting conditions are changed. 相似文献
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刀具磨损监测及破损模式的识别 总被引:2,自引:0,他引:2
对于金属切削过程中的刀具磨损,提出了基于隐马尔可夫模型的模式识别理论来识别刀具的不同磨损状态,从而预报刀具破损.该方法对切削过程中切削力信号的动态分量和刀柄振动信号进行快速傅里叶变换特征提取,然后利用自组织特征映射对提取的特征矢量进行预分类编码,把矢量编码作为观测序列引入到隐马尔可夫模型中进行机器学习,建立了3个不同磨损状态的隐马尔可夫模型,并利用最大概率进行模式识别.试验表明,该方法对车刀磨损过程进行识别和预报是有效的. 相似文献
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介绍了一种基于灰色残差修正模型的机床切削力预测的建模方法。仿真结果表明,这种新的建模方法具有较高的精度,为高度复杂的非线性模型化提供了一条新途经。此方法利用某一机床厂具体的数据进行硷验,得到了满意的结果。 相似文献
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刚性的球头铣刀切削力模型 总被引:8,自引:0,他引:8
基于切削力与切屑负载之间的经验关系,通过对球头铣刀的微分化方法,建立了球头铣刀基本切削力模型,并着重研究刀具的径向跳动对径向未变形切屑厚度的影响,提出了刚性的球刀铣刀切削力模型,最后用切槽实验对模型进行了验证。 相似文献
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Cutting forces prediction in generalized pocket machining 总被引:1,自引:1,他引:0
Zhao-cheng Wei Min-jie Wang Xian-guo Han 《The International Journal of Advanced Manufacturing Technology》2010,50(5-8):449-458
Cutting force prediction is important for the planning and optimization of machining process. This paper presents an approach to predict the cutting forces for the whole finishing process of generalized pocket machining. The equivalent feedrate is introduced to quantify the actual speed of cutting cross-section in prediction of cutting force for curved surface milling. For convenience, to analyze the process with varying feed direction and cutter engagement, the milling process for generalized pocket is discretized into a series of small processes. Each of the small processes is transformed into a steady-state machining, using a new approximation method. The cutting geometries of each discrete process, i.e., feed direction, equivalent feedrate per tooth, entry angle, and exit angle are calculated based on the information refined from NC code. An improved cutting force model which involves the effect of feed direction on cutting forces prediction is also presented. A machining example of a freeform pocket is performed, and the measured cutting forces are compared with the predictions. The results show that the proposed approach can effectively predict the variation of cutting forces in generalized pocket machining. 相似文献