共查询到19条相似文献,搜索用时 125 毫秒
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先进制造技术中高效切削刀具的几何形状与几何参数是否合理直接影响刀具的使用寿命以及产品的加工质量,针对这个问题,采用面结构光投影法对高效切削刀具的几何参数进行非接触式测量,此方法不仅能够准确重建出用于其几何参数测量的刀具三维模型,还能够直观反映刀具表面有无缺陷。主要对面结构光投影法基本思想、测量系统数学模型和点云旋转拼接进行了研究,并给出了刀具转台坐标系和CCD摄像机成像坐标系之间的变换关系,并对直柄麻花钻进行测量实验,实际结果测量结果的比较表明面结构光投影法可有效对刀具进行测量,且测量精度较高。 相似文献
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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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Zhongjun Qiu Feng Zhou Fang Liyu Ding Qunzhang Zhao 《The International Journal of Advanced Manufacturing Technology》2011,56(1-4):79-86
The profile tolerance of diamond cutting tool??s edge is one of the key factors in affecting machining accuracy. With the development of ultra-precision machining technology for optical free-form surfaces and optical microstructures, the demand for high-precision round nose diamond cutting tools is increasing. In this study, an on-machine image processing approach is applied to cutting edge geometry truing process, and profile data of cutting edge in sub-pixel precision is acquired using a series of image processing methods. According to the profile captured, the deviation from an ideal cutting edge is calculated and feedbacked to the controller. The lapping system is employed to lap the cutting edge pertinently using the deviation and the corresponding position captured, and the round edge of high accuracy is obtained efficiently. This method can avoid the error caused by the process of refixturing for offline measurement in the traditional lapping method of diamond cutting tool and reduce the influence of human factors. A truing experiment for cutting edge of the monocrystal diamond cutting tool is carried out at the developed lapping system based on on-machine image measurement, and round cutting edge of profile tolerance less than or equal to ±0.5???m is achieved. 相似文献
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The measurement and evaluation technology of high precision diamond tools is critically important for supporting the ultra-precision machining. In practical cutting process, the edge profile quality of the diamond tool, including sharpness, micro defects, roughness and tip arc waviness, greatly affects the cutting quality. It is very difficult to measure and evaluate the diamond tool edge profile due to the high precision of tool edge profile and complexity of various measurement parameters. In this paper, an integrated method for measurement and characterization of diamond tools is proposed, which is based on an Atomic Force Microscope (AFM) module. Multiple technical indexes of diamond tools are obtained and validated based on the presented research and cutting experiments, and the evaluation model for each technical index is also proposed. The integrated measurement equipment, including an AFM, precision adjustment device and aerostatic bearings, has been established based on the accuracy requirement of measurement parameters. The edge sharpness, micro defects, surface roughness and tip arc waviness have been obtained based on the evaluation model and experimental data. The experimental results show that the measurement accuracy meets the requirements of the comprehensive evaluation of the diamond tool edge profile. The research work will also contribute to the development of ultra-precision machine. 相似文献
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A method, which is referred to as the edge reversal method, is proposed for precision measurement of the cutting edge radius of single point diamond tools. An indentation mark of the cutting edge which replicates the cutting edge geometry is firstly made on a soft metal substrate surface. The cutting edge of the diamond tool and its indentation mark, which is regarded as the reversal cutting edge, are then measured by utilizing an atomic force microscopy (AFM), respectively. The cutting edge radius can be accurately evaluated through removing the influence of the AFM probe tip radius, which is comparable to the cutting edge radius, based on the two measured data without characterization of the AFM probe tip radius. The results of measurement experiments and uncertainty analysis are presented to demonstrate the feasibility of the proposed method. 相似文献
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TOOL FORCE MODEL FOR DIAMOND TURNING 总被引:1,自引:0,他引:1
Wang HongxiangSchool of Mechanical andElectrical Engineering Harbin Institute of Technology Harbin ChinaSun TaoPrecision Engineering Research Institute Harbin Institute of Technology Harbin ChinaLi DanSchool of Mechanical andElectrical Engineering Harbin Institute of Technology Harbin ChinaDong ShenPrecision Engineering Researcn Institute Harbin Institute of Technology Harbin China 《机械工程学报(英文版)》2004,17(1):145-148
A new tool force model to be presented is based upon process geometry and the characteristics of the force system, in which the forces acting on the tool rake face, the cutting edge rounding and the clearance face have been considered, and the size effect is accountable for the new model. It is desired that the model can be well applicable to conventional diamond turning and the model may be employed as a tool in the design of diamond tools. This approach is quite different from traditional investigations primarily based on empirical studies. As the depth of cut becomes the same order as the rounded cutting edge radius, sliding along the clearance face due to elastic recovery of workpiece material and plowing due to the rounded cutting edge may become important in micro-machining, the forces acting on the cutting edge rounding and the clearance face can not be neglected. For this reason, it is very important to understand the influence of some parameters on tool forces and develop a model of the relatio 相似文献
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R. S. Pawade 《Machining Science and Technology》2013,17(1):132-152
The mechanism of serrated chip formation during high-speed turning of Inconel 718 using PCBN cutting tools has been investigated with the aid of scanning electron microscopy and optical microscopy. A conceptual model of chip formation has been developed knowing the chip morphology. It is followed by the analysis of chip segmentation frequency and the chip forms. Further, the chip segment forms and geometry were quantitatively characterized as a function of machining parameters and the cutting edge geometry using statistical methods. The chip morphology has been correlated with the cutting forces, specific shearing energy and the resultant roughness of the machined surfaces. 相似文献
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Carl-Frederik Wyen Wolfgang Knapp Konrad Wegener 《The International Journal of Advanced Manufacturing Technology》2012,59(9-12):899-914
The influence of the cutting edge micro geometry on cutting process and on tool performance is subject of several research projects. Recently published papers focus on optimising the cutting edge rounding. The results are partly inconsistent. Unfortunately, no international standard yet exists to properly describe the cutting edge micro geometry. This is seen as the root cause for detected discrepancies. To develop a common understanding for the influence of rounded cutting edges, it is indispensable to use the same basis to characterise the edge profile. This paper gives a review on existing characterisation methods, analyses the difficulties in their application and discusses different modelling ideas to describe the cutting edge profile. Based hereon, a new algorithm and geometrical parameterisation of the cutting edge is proposed, which reduces uncertainties and difficulties in the application of currently available methods. The proposed method considers measurement uncertainties and is robust against form errors and creates thus the basis required for the study of the influence of rounded cutting edges. 相似文献