Papers by Keyword: Grinding Process

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Authors: V Kuzin
Abstract: The results of the study of the influence of the grinding regimes and the characteristics of the diamond tool on the strength and the surface layer of the ceramic parts based on silicon nitride are presented in this article. The revealed regularities of the surface layer and defect formation have been used to develop a model of the forming of the surface layer of the ceramic parts. The proposed model will increase operational resource resistance of the ceramic parts by 10–25%.
127
Authors: Xiang Yang Lei, Hao Huang, Shi Han Zhang, Jian Wang, Qiao Xu, Yin Biao Guo
Abstract: According to needs of aspheric lens grinding and measurement with X/Y/Z 3-axis grinding machines, a CAM system is designed and implemented. The system, based on the parallel grinding geometry model, has realized the function of grinding locus planning, form error compensation, NC program auto-generation, on-machine measurement, grinding wheel on-machine measurement, simulation and technical database. To verify the stability of this CAM system, experiments were performed with three independent machining experiments. The experimental results indicate that the system realized the whole process of aspheric grinding, and it improved the machining efficiency and automation. Especially, this system adopted on-machine form error compensation technology and improved the machining accuracy. By implementing the error compensation integrated in the CAM system, the surface form error of a 430mm×430mm aspheric lens is decreased from PV8.2µm to PV4.1µm. The grinding accuracy was improved 100%.
23
Authors: Peng Guan, Ji Qiang Li, Shuang Zhu, Tian Biao Yu, Wan Shan Wang
Abstract: Grinding is an important method for precision machining and ultra-precision grinding. It is used to generate parts with high surface finish, high form accuracy and surface integrity. In recent years, grinding technology in precision machining and ultra-precision machining of ceramics, glass and high-strength alloys and other hard materials has been applied widely. Grinding process is complex, once known as "black processing technology." Computer simulation is an important method to research the grinding mechanism and optimize the grinding process parameters. Especially in recent years as the development of computer calculation speed, the improvement of computer graphics theory and the gradual maturity of artificial intelligence technology, experts and scholars whose research subject related grinding had done a lot of work on grinding simulation. This paper gives an overview of the current state of the art in simulation of grinding processes: Physical simulation (material removal mechanism, grinding force, grinding temperature, etc.) and geometrical simulation (surface topography and surface integrity) are taken into account, and outlined with respect to their achievements in this paper. Furthermore, the capabilities and the limitations of the presented simulation approaches will be exemplified.
1879
Authors: Marin Gostimirović, Vladimir Pucovsky, Pavel Kovač, Milenko Sekulić, Borislav Savković
Abstract: This paper indicates the occurrence of high thermal energy in the surface layer of workpiece material during the process of grinding. To help identify the share of heat which affects the workpiece, firstly the analysis of past research in the field of heat transfer during grinding was conducted. Further there is a proposition of analytical expression for heat distribution factor to the workpiece in the grinding process. Goal of this analytical dependence is to achieve more efficient production of mechanical parts without thermal defects in the surface layer of the part. Presented equation for energy partition has a characteristic of widespread practical use.
80
Authors: Zhi Jun Lv, Qian Xiang, Jing Zhu Pang
Abstract: Grinding is widely used as a precision process for machining difficult-to-cut materials. Grinding productivity is still greatly dependent on the experience and skill of human operators. Focusing on the indirect method, an attempt was made to build up an intelligent system to monitor the condition of grinding wheels with force signals and the acoustic emission (AE) signals. An artificial immune algorithm based multi-signals processing method was presented in this paper. The intelligent system is capable of incremental supervised learning of grinding conditions and quickly pattern recognition, and can continually improve the monitoring precision. The experiment indicates that the accuracy of condition identification is about 87%, and able to meet the industrial need on the whole.
2759
Authors: Ming Jun Chen, Ziang Li, Kang Jun Luo, Ying Chun Liang, Zhen Fang, Bo Yu
Abstract: Fused silica glass is widely used on the manufacture of optical apparatus and resonators due to it’s interesting optical and vibration properties. In order to machining the complex structures in the resonators and optical apparatus, grinding process with inclined ball-headed diamond wheel is discussed. Analytical model of the grinding process with inclined ball-headed diamond wheel was built firstly. Afterwards grinding experiments were conducted by varying the feed speed, the rotation speed, the cutting depth and the average grain size of the ball-headed diamond wheel. The machining surfaces were characterized by surface profiler to investigate the effect of the grinding parameters on the surface roughness. The measurement result shows the average grain size of the diamond wheel has important influence on the machining surface and the surface roughness at the groove bottom is better than the groove edge due to the wheel axis tilt angle.
102
Authors: Cong Mao, Zhi Xiong Zhou, De Wang Zhou, Du Yi Gu
Abstract: In order to understand the grinding mechanism and analyze the grinding operation, it is necessary to study the contact phenomena between wheel and workpiece during grinding operation. The contact length, the grinding temperature distribution within the contact zone, and the grinding forces are measured in-process by using Critical Contact State mode, thermocouple method, and 3-axis piezoelectric dynamometer, respectively. It is found that the grinding conditions and the properties of work material have effects on the contact length, moreover, the mechanism of which is discussed in this paper. The results show that the contact length significantly interacts with grinding force and grinding temperature in the grinding zone.
128
Authors: Xiang Ming Huang, Zhi Xiong Zhou, Yang Jun, Qi Long Xia
Abstract: White layers formed in grinding process have negative effects on components. White layer will result in brittle surfaces, which will cause product failure. Since grinding parameters may influence white layer formation, it is necessary to study the relationship between white layer thickness and various grinding parameters. In this study, grinding experiments are carried out using harden AISI52100 steel as work material. Grinding parameters,such as wheel speed, workpiece speed, grinding depth, grinding wheel wear and cooling condition on the thickness of white layer have been studied. The specimens were analyzed using a micro hardness tester and SEM. The experiments indicate white layer depth varies with the different combinations of machining parameters. The depth of white layer increases with the grinding depth, wheel speed and wheel wear. There is a critical work table
535
Authors: Guang Hui Cheng, Yuan Song
Abstract: The change of the specific surface area, particle size and activity index of ground granulated blast furnace slag under different grinding conditions is researched based on closed-circuit mill in the paper. The research shows that the grinding effect is greatly different with the different grinding body, and proper pre-grinding time can help to improve the grinding effect. The optimum plan in this paper is as follow: pre-grinding 15 min at steel bar then grinding 30 min at ball grinding, and it will getting the maximum specific surface area, the smallest powder particle size and the the maximum activity index.
4187
Authors: Xin Li Tian, Ai Bing Yu
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