Papers by Keyword: Nut

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Authors: N. Igata
Abstract: Fe-12Cr-22Mn and Fe-12Cr-22Mn-2Co (High Damping Stainless Alloy HIDAS) were developed and applied for suppression of noise or vibration. Since these alloys have high strength (1400Mpa) as well as high damping capacity (1020) due to/ interface, their direct replacements for the parts of machines were possible. In this respect, the applications were tried mainly to machineries and nanotechnologies. Those were bolt and nut, gear, bite shank, cutting tool of numerically controlled (NC) machine, brake and arm of hard disk drive (HDD) and others. In those applications, all data obtained showed better results compared with other materials. Cost down and quality control would be the remaining problems.
Authors: Jian Qi Zhang, Fu Min Bao, Hong Tao Dang
Abstract: By analyzing the communication principles of ControlNet and combining with the specific production process flow, the ControlNet control system has been designed. Meanwhile, the ControlNet network optimization scheme is proposed and has been applied in the actual production according to the existing ControlNet design problems. The application result shows that the network division and network key parameters setting are very effective optimization methods, which successfully solved the emerging ControlNet fault in the production process and met the control requirements. At the same time, they are worth to be consulted for ControlNet design and optimization.
Authors: Zhong An Yu, Chun Li Wang, Pei Yu Guo, Kong Kan
Abstract: This system use PC as the core of image analysis and processing, with the single chip processor as the control core execution, combining with machine vision image processing technology, using advanced image processing algorithms, to achieve separation of the nut, and through experiments to test the correctness of the algorithm. The system has the advantage of a fast processing speed and high reliability. It not only save the manpower cost, but also improve the efficiency of the nut sorting.
Authors: Xue Ren Zhang, Jing Xu Nie, G. Hou
Authors: Yu Hong Gai, Ye Yan, Cheng Nan Li, Bao Min Li, Wei Du, Mu Sen Li
Abstract: Failure analysis on the GCr15 bearing steel and the 20CrMo carburized steel nuts was performed after two sets of fatigue tests of GD8020×1100 ball screw pair. By means of scanning electron microscopy observation, energy dispersive analysis and microhardness testing, it is found that there is an obvious indentation, slight pitting and microcracks on the raceway of the GCr15 bearing steel nut and shows the characteristics of contact fatigue failure. The nonuniformity of microstructure and the lower carbon and chromium content in the indentation, leading to local lower hardness, account for the nut failure. While the raceway of the 20CrMo carburized steel nut is more rough with scratches caused by the damaged steel balls so as to show the characteristics of wear failure. Therefore there are different failure ways for the different nuts made by different steels and heat treatments under the same fatigue testing condition.
Authors: Qian Wang, Mu Sen Li, Xia Ding, Bao Min Li, Qing Xin Dong
Abstract: This paper dealt with the fracture failure of a GCr15 steel ball screw nut. Through testing and analysis of hardness, microstructure, scanning electron microscopy and energy dispersive spectrum meter, it was found that there are local carbide network, few oversized carbide particles and metallic inclusions. The analysis showed that carbide network was failed to be eliminated through spheroidizing annealing treatment, while the presence of non-uniform carbide particles and metallic inclusions easily induced the crack and consequently led to the fracture of the nut.
Authors: Lubomír W. Novotný, Jiří Marek, Tomáš Marek
Abstract: Ball screws and nuts represent the inseparable part of machinetool building. The thread lead accuracy ranges in hundredths of millimetres per 1 m. In addition to the undesirable phenomena caused by heat (dilatability) and, e. g., torsional and transverse oscillations, the bending stress of the ball screw is considerably undesirable too. This stress and at the same time behaviour are transferred to the bending stress of the ball screw nut. This has a very harmful influence on setting of the ball screws, when the machine tool is assembled. Using the analysis by means of the FEM method, the paper conducts a survey of deformation issue of the arrangement "machine – ball screw – ball screw nut" during the assembly stage as well as a survey of compensation possibilities and other technical measures determined to limit the undesirable deformations and stress of the ball screw originating already in the manufacturing stage of the machine tool.
Authors: Valentin Morozov, Vadim Panyuhin, Aleksey Zhdanov
Abstract: We examine the method to determinate the kinematic characteristics of the RSM, Classification of mechanisms of this class to convert rotational motion into linear motion is introduced. At the same time, we have developed some formulas to determinate the kinematic transfer functions of the RSM of different types depending on the geometrical parameters of this kind of screw mechanism.
Authors: Xiao Hao Dai, Yan Ting Feng, Xiao Guang Niu, Hui Fan, Qiang Wang, Xing Ya Chang
Abstract: Five groups of vibration experiments were carried out on the 6.8 grades and M20 bolts and nuts that used on transmission tower. The test result shows that the basic way to improve the anti-loosening property was increasing the initial preload. Both increasing initial torque and appending lubrication can obviously increase the initial preload, however appending lubrication may reduce it's anti-loosening property under the situation of same preload. In the vibrating process the second stage plays a decisive role for anti-loosening property, it can be expressed as reduced rate “K” of the preload.
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