共查询到19条相似文献,搜索用时 140 毫秒
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基于图像处理的刀具角度测量系统 总被引:1,自引:0,他引:1
针对加工过程中刀具磨损会影响零件加工精度的问题,利用图像处理技术实现了刀具角度的测量,以达到对刀具磨损情况进行动态跟踪的目的。以Matlab软件作为图像处理平台,通过图像灰度转换、二值化、边缘提取等技术手段,获得了刀具边缘轮廓,进一步用最小二乘法将轮廓拟合,最终求出了刀具角度。实验结果表明,该方法能较好地测量刀具角度,也可用于刀具几何参数的测试。 相似文献
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采用MATLAB图像处理技术,通过图像二值化、中值滤波、边缘检测等方法获得刀具轮廓,并应用曲线拟合方法对轮廓边界进行拟合,通过分析拟合直线刃的斜率,计算得出刀具角度值。实验结果表明,利用MATLAB检测刀具角度,不仅测量误差小,检测效率高,而且适应性广泛,可实现对高精度和微小刀具几何参数的测量。 相似文献
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车削凸轮时刀具要快速往复移动,但由于凸轮轮廓非圆度的影响,刀具工作角度随着刀具切削点位置的不同其角度会产生变化,这将降低产品的加工质量,影响刀具的使用寿命,因此在车削凸轮的过程中要对刀具工作角度的变化给予补偿,以使其恒定不变。文中提出了一种摆动刀架结构设计方案,使刀具能根据凸轮轮廓的变化其工作角度可以实时调整,并分析推导出了刀具摆动角度的计算方法,可利用数控系统的系统变量通过宏程序来实现刀具摆动角度的自动计算。 相似文献
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在侧铣加工中,刀具磨损和变形引起的刀具回转轮廓误差在实际加工前难以准确预测。提出一种工件形状刀具轮廓映射的辨识试验方法来获取加工过程刀具回转轮廓误差,并通过多因素正交试验获取了不同工况下刀具回转轮廓误差数据库。基于误差数据,采用最小二乘支持向量机(LS-SVM)技术建立了刀具回转轮廓误差预测模型。运用遗传算法优化对所提模型有重要影响的核函数参数和错误惩罚因子, 建立了基于遗传算法优化的最小二乘支持向量机(GA-LS-SVM)模型,并与未经遗传算法优化的LS-SVM模型进行了对比,试验结果表明,GA-LS-SVM预测模型能更好地适用于刀具回转轮廓误差预测。 相似文献
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Qiang Guo Bo Zhao MingYang Zhang Yan Jiang Yan Zhang 《The International Journal of Advanced Manufacturing Technology》2017,93(5-8):1737-1749
Classical ways of computing cutting force coefficients cannot be used by the cutters with non-uniform helix and pitch angles. So, this paper presents a novel separate-edge-forecast method to compute cutting force coefficients for any kind of flank-end cutter, especially for cutters with non-uniform helix and pitch angles. Using this method, the cutter runout can be combined into the cutting force coefficients without computing the cutter runout parameters. Simultaneously, the method predicts the cutting force coefficients for every cutter edge. Firstly, a series of three-axis machining experiments, which must satisfy the specific condition that only one cutter edge is removing materials at any time, is conducted. Then, the cutting force-curves are divided into N force lobes. Each lobe is assigned to the corresponding cutter edge using an algorithm. Subsequently, the cutter edge and the corresponding cutting force lobe are used to determine the cutting force coefficients. This means N cutter edges have N groups of cutting force coefficients, correspondingly. Finally, in order to verify the validity and correctness of the proposed method, a cutter with non-uniform helix and pitch angle is utilized to predict cutting force coefficients based on which the cutting forces are also computed. The results demonstrate that the cutting forces predicted agree well with the data measured. Simultaneously, it can be observed that the method can predict the coefficients considering the cutter runout effect. 相似文献
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Chen Zhang Song Guo Haiyan Zhang Laishui Zhou 《The International Journal of Advanced Manufacturing Technology》2013,68(9-12):2849-2860
This paper presents a model for the prediction of surface topography considering tool wear during the milling process. First, the cutting edge path equation, which can be transformed into equivalent polynomial equations and solved for discrete positions along the feed direction, is established including the effect of tool wear. Then, cutting edge is divided into a series of cutting points and an algorithm is proposed to determine the range of divided position angle. Finally, surface topography model is established based on the established cutting path equation, the range of position angle, the calculated cutting time, and spiral lag angle. By using this model, surface topography generation is simplified with respect to other models in literature and the modeling method of surface topography does not need to mesh the workpiece and the model can easily be extended to include other factors on surface generation. Based on the established surface topography model, an algorithm is proposed to simulate generation of surface profile in milling operation. Experimental work and validation of the established model is performed on a five-axis milling center by using stainless steel 1Cr18Ni9Ti and cemented carbides milling cutter. Cutting test results about the topography generation of the plane and cylindrical surface show good agreement with model predictions. 相似文献
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0 lNTRODUCTlONWith the rapid development of assembleautomatic,machine visinn has been poPularly used onsudsce mounted technofogy (SMT ) field. It hasreSOved many problems in electronic factory assemblyline environments. Ref. [ l ] -- Ref. [ 41 gave someexamples, which resolved many insPeCtion prOblems inSMT from the views of image process and imageaedysis, image defect clinic strategy and somecommerce vision system. Teday, the machine visionbranch system is used in almost all of the h… 相似文献
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本文对金刚石刀具刃口钝圆半径求解方法展开研究,以有效提升金刚石刀具刃口锋利度的测量精度。文中分析了原子力显微镜(AFM)扫描探针几何形貌对金刚石刀具刃口锋利度测量结果的影响,并提出了基于切点约束和AFM探针针尖半径补偿的刀具刃口钝圆半径求解方法;讨论了消噪滤波、测量角度误差以及切点分离方法对测量结果的影响;在高精度测量平台上完成了金刚石刀具刃口锋利度测量,并将被测量的刀具用于飞切加工KDP晶体。结果表明:提出的刃口钝圆半径求解方法能够准确求解金刚石刀具的刃口锋利度,测量结果能很好地描述金刚石刀具的刃口锋利程度,可以为金刚石超精密切削加工的选刀和用刀提供有效指导。 相似文献
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Xin Cheng Shanshan Jin Tongkai Liao Feng Jiang 《The International Journal of Advanced Manufacturing Technology》2017,91(1-4):137-146
Geometry of cutting edge has great influence on performance and reliability of modern precision cutting tools. In this study, two-dimensional finite element model of orthogonal cutting of Fe–Cr–Ni stainless steel has been built to optimize the geometric parameters of chamfered edge. A method to measure the chip curl radius has been proposed. The effect of cutting edge geometric parameters on tool stress and chip curl radius has been analyzed. Then, the chamfered edge parameters have been optimized based on numerical simulation results. It finds that, keeping the equal material removal rate, the optimal geometric parameters of chamfered edge for rough machining Fe–Cr–Ni stainless steel are that the rake angle is from 16° to 17°, and the chamfer length is from 60 to 70 μm. Small (large) rake angle combined with small (large) chamfer length is more reasonable to reduce the tool stress. When the length of land is approximately equal to undeformed chip thickness and the rake angle is larger than 15°, the chip curl radius is minimal. The groove type with large radio of width to depth should be used in the chip breaking based on the optimization results. 相似文献
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新构形硬质合金插齿刀切削刃几何角度分析 总被引:1,自引:0,他引:1
提出了一种硬质合金插齿刀的新构形方法———异形凸曲前刀面硬质合金插齿刀,对新构形插齿刀的前角、后角及刃倾角进行了分析;建立了切削刃几何角度的数学模型,与原构形硬质合金插齿刀进行了比较研究。 相似文献