共查询到20条相似文献,搜索用时 125 毫秒
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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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刀具刃口钝化技术的探讨 总被引:4,自引:0,他引:4
刀具是机床的“牙齿”,刃口的形式和质量是刀具能否多快好省进行切削加工的前提。影响刀具切削性能和刀具寿命的因素,除了刀具材料、刀具几何参数、刀具结构、切削用量优化等,刀具刃口的状况也是不可忽视的。经过氧化铝、碳化硅或金刚石砂轮刃磨后的刀具刃口,确实存在程度不同的 相似文献
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通过研究刀具刃口半径与刀具切断纤维的力之间的关系 ,提出了一种检测加工刀具锋利性能的方法。研究认为 ,刀具的刃口半径与刀具切断纤维的力之间有很好的对应关系 ,可以通过测定刀具切断纤维的力来检测加工刀具的锋利性能。试验条件对检测结果有很大的影响 相似文献
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A study of the effect of tool cutting edge radius on ductile cutting of silicon wafers 总被引:1,自引:1,他引:1
K. Liu X. P. Li M. Rahman K. S. Neo X. D. Liu 《The International Journal of Advanced Manufacturing Technology》2007,32(7-8):631-637
Ductile mode cutting of silicon wafers can be achieved under certain cutting conditions and tool geometry. An experimental
investigation of the critical undeformed chip thickness in relation to the tool cutting edge radius for the brittle-ductile
transition of chip formation in cutting of silicon wafers is presented in this paper. Experimental tests for cutting of silicon
wafers using diamond tools of different cutting edge radii for a range of undeformed chip thickness are conducted on an ultra-precision
lathe. Both ductile and brittle mode of chip formation processes are observed in the cutting tests. The results indicate that
ductile cutting of silicon can be achieved at certain values of the undeformed chip thickness, which depends on the tool cutting
edge radius. It is found that in cutting of silicon wafers with a certain tool cutting edge radius there is a critical value
of undeformed chip thickness beyond which the chip formation changes from ductile mode to brittle mode. The ductile-brittle
transition of chip formation varies with the tool cutting edge radius. Within the range of cutting conditions in the present
study, it has also been found that the larger the cutting edge radius, the larger the critical undeformed chip thickness for
the ductile-brittle transition in the chip formation. 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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Partchapol Sartkulvanich Hakan Sahlan Taylan Altan 《Machining Science and Technology》2007,11(2):157-181
The research discussed in this article focuses on the effects of tool geometry (i.e., rake angle and cutting edge radius) and flank wear upon burr formation in face milling of a cast aluminum alloy. As to tool edge preparation, the use of a tool with variable cutting edge radius was investigated using FEM, and compared for its cutting performance (i.e., burr reduction and tool life) with a conventional tool with uniform cutting edge radius. In order to evaluate 3D face milling through 2D orthogonal cutting simulations, the cross-sections that consist in the cutting speed direction and chip flow direction were selected at different locations along the tool rounded corner. At these cross-sections, the local value of cutting edge radius and their associated tool rake angles as well as the effective uncut chip thickness were determined for 2D cutting simulations. In addition, 3D face milling simulations were conducted to investigate more realistic chip flow and burr generation. Comparisons were made for burrs produced from 3D simulations with a sharp tool, 3D simulations with a worn tool and face milling experiments. Finally, recommendations for cutting tool design are made to reduce burr formation in face milling. 相似文献
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Ik Soo Kang Jeong Suk Kim Yong Wie Seo 《Journal of Mechanical Science and Technology》2008,22(2):293-299
The analysis of the cutting force in micro end milling plays an important role in characterizing the cutting process, as the
tool wear and surface texture depend on the cutting forces. Because the depth of cut is larger than the tool edge radius in
conventional cutting, the effect of the tool edge radius can be ignored. However, in micro cutting, this radius has an influence
on the cutting mechanism. In this study, an analytical cutting force model for micro end milling is proposed for predicting
the cutting forces. The cutting force model, which considers the edge radius of the micro end mill, is simulated. The validity
is investigated through the newly developed tool dynamometer for the micro end milling process. The predicted cutting forces
were consistent with the experimental results. 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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Ultra precision diamond cutting is a very efficient manufacturing method for optical parts such as HOE, Fresnel lenses, diffraction
lenses, and others. During micro cutting, the rake angle is likely to become negative because the tool edge radius is considerably
large compared to the sub-micrometer-order depth of cut. Depending on the ratio of the tool edge radius to the depth of cut,
different micro-cutting mechanism modes appear. Therefore, the tool edge sharpness is the most important factor which affects
the qualities of machined parts. That is why diamond, especially monocrystal diamond which has the sharpest edge among all
other materials, is widely used in micro-cutting. The majar issue is regarding the minimum (critical) depth of cut needed
to obtain continuous chips during the cutting process. In this paper, the micro machinability near the critical depth of cut
is investigated in micro grooving with a diamond tool. The experimental results show the characteristics of micro-cutting
in terms of cutting force ratio (Fx/Fy), chip shape, surface roughness, and surface hardening near the critical depth of cut. 相似文献
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