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Effects of ZrO2 on physical and mechanical properties of vitrified bond CBN composite materials
Xuezhi Wang,Tianbiao Yu,Xue Sun,Zixuan Wang,Wanshan Wang 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.9
The effects of ZrO2 on the physical and mechanical properties of vitrified bond and vitrified boron nitride (CBN) compositeswere systematically investigated. The basic vitrified bond (B2O3-Al2O3-SiO2-Li2O-Na2O) and ZrO2 make up the vitrified bond,and then constitute the vitrified CBN composites consists together with CBN abrasives. The addition of ZrO2 has a certaininfluence on refractoriness, liquidity, bending strength of vitrified bond. With the increase of adding amount of ZrO2 therefractoriness of vitrified bonds gradually rises, and fluidity of vitrified bonds becomes lower. When the ZrO2 addition amountreaches a certain extent, the crystalline phase-ZrSiO4 will appear during the sintering process. In addition, the ZrO2 can addto a certain extent, improve the strength of the bond and CBN composites, when ZrO2 addition amount of 8 wt.%, theperformance of the vitrified bond is the most. Its value changes from 69.74 MPa to 87.45 MPa.
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Yuanxing Dai,Yanming Fu,Baichun Li,Xuezhi Wang,Tianbiao Yu,Wanshan Wang 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.11
Most mechanism contains one or more joints. However, joint clearances which cannot be dislodged make accuracy analysis become complicated. In order to seek a method to investigate the impact of joint clearances on the accuracy of a parallel robot, this paper deals with the 3-SPS-1-S spatial parallel robot’s pose error predicting and sensitivity analyzing. In this paper, a nonlinear method for evaluating the sources of the pose errors is proposed on the condition that the pose errors only come from joint clearances. Firstly, based on the nonlinear contact modes inside the joints, the error equivalent method is outlined for spherical joint and sliding pair. Then the pose error distribution over its workspace is presented. Secondly, those areas where the pose errors present abnormally changing are analyzed. Thirdly, sensitivity models are defined to evaluate how much the external variable load affects the pose errors. Finally, the simulation results, which are consistent with the structural characteristics of the 3-SPS-1-S spatial parallel robot, proved the validity of the equivalent method proposed in this paper.
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