Geometric error compensation of spherical surface grinding system

Precision grinding of silicon carbide ceramic micro-structured moulds is becoming more common in the area of the moulding of glass materials. However, in micro-structured grinding of super-hard and brittle materials, problems frequently occur in terms of chipping and rounding of micro-structural edge features. In order to overcome these technological constraints, a promising method using ultrasonic vibration of workpiece materials is proposed. The design of a novel ultrasonic vibration apparatus and the experimental investigation of ultrasonic vibration assisted grinding of SiC micro-structures are presented. The experimental results show that the application of ultrasonic vibration can enhance the ground surface quality and improve the edge features of micro-structures.

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Ultrasonic vibration-assisted grinding of micro-structured surfaces on silicon carbide ceramic materials

Guo

Zhao

Jackson

2011

Proceedings of the Institution of Mechanical Engineers, Part B:

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Modeling and calibration of pointing errors using a semi-parametric regression method with applications in inertially stabilized platforms

Hong

Zhou

Zhang

et al. 2013

Proceedings of the Institution of Mechanical Engineers, Part B:

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This article investigates modeling and calibration issues that are associated with inertially stabilized platforms to achieve accurate pointing. In modeling part, the Denavit-Hartenberg notation is used to perform an error analysis of the kinematics of inertially stabilized platforms. A physical model is then established to illustrate the effects of geometric errors that are caused by imprecision in the manufacturing and assembly processes on the pointing accuracy of inertially stabilized platforms. In the calibration part, an improved hybrid model denoted as the semi-parametric regression model is developed to compensate for remaining nonlinear errors. With applications to a two-degree-of-freedom miniature inertially stabilized platform, semi-parametric regression model is shown to outperform physical model substantially in all cases. The experimental results also indicate that the proposed semi-parametric regression model eliminates both the geometric and nonlinear errors, and that the pointing accuracy of miniature inertially stabilized platform significantly improves after compensation.

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Belt grinding process with force control system for blade of aero-engine

Duan

Zhang

Shi

2015

Proceedings of the Institution of Mechanical Engineers, Part B:

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In abrasive belt grinding process for surface of blade, elasticity, deformation and abrasive belt wear are major factors affecting the machining stability, efficiency and quality. In order to improve the grinding process and realize optimal grinding, a new controllable and flexible belt grinding mechanism is designed and assembled in a special computer numerical control grinding machine, accompanied with a constant grinding force control system. Based on the analysis of proportional valve and cylinder system in this grinding mechanism, a mathematic model of normal grinding force is constructed. Afterward, a fuzzy proportional–integral–derivative control strategy is proposed to deal with the uncertainty and nonlinearity of this system. A Simulink model of force control process is developed, and the good performance is achieved according to the simulation result. Finally, several grinding experiments for an aero-engine fan blade are carried out. The measurements show that the proposed grinding process with fuzzy proportional–integral–derivative force controller enhances the machining stability and efficiency considerably. What is more, the machining qualities, such as surface roughness, form accuracy and consistency, are improved significantly. And all the grinding results satisfy the machining requirements in the manufacturing process of blade.

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Geometric error compensation of spherical surface grinding system

Cited by 6 publications

References 10 publications

Ultrasonic vibration-assisted grinding of micro-structured surfaces on silicon carbide ceramic materials

Ultrasonic vibration-assisted grinding of micro-structured surfaces on silicon carbide ceramic materials

Modeling and calibration of pointing errors using a semi-parametric regression method with applications in inertially stabilized platforms

Belt grinding process with force control system for blade of aero-engine

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