Simulation Of Ultrasonic Vibration Grinding Of Hard Alloy

Grinding and ultrasonic machining are widely used in the processing of hard and brittle materials, which have the characteristics of low machining amount, high machining precision and so on. Along with the development of new materials and composite materials constantly emerging, the demand of materials that are hard brittle and difficult to machine is getting bigger and bigger in various fields. The disadvantage of the traditional grinding way is gradually revealed. It is difficult to meet the requirements of high efficiency and high precision.Therefore, to improve the machining precision and efficiency, improve the surface quality of the workpiece, reduce the grinding force is becoming more and more urgent. In this thesis,material removal mechanism theoretical analysis is made in ultrasonic vibration assisted grinding hard alloy material processing method. by using the finite element analysis software ANSYS / LS-DYNA,Single grinding particle kinematics and mechanics model in processing is established, and the processes of kinematics and mechanics were analyzed.Firstly, this paper analyzes the characteristics of traditional grinding and ultrasonic machining processing, and material removal mechanism in machining hard and brittle materials. Characteristics of ultrasonic vibration assisted grinding processing is synthetically analysed.Then processing methods of ultrasonic vibration and grinding on hard and brittle material removal are analysed in the aspects of material removal rate and machining accuracy.The application of finite element simulation in the research of metal working process is studied.Based on the kinematic analysis and mechanical analysis of single abrasive grain in ultrasonic vibration assisted grinding process, the finite element software is used to model the single abrasive grain in different processing modes. Based on the basic principle of finite element method with the topic, we build the model in accordance with basic processes of the characteristics and definition of element, model and selection of materials, the establishment of basic geometric model, meshing, definition of contact, solving and post-processing. Finally,stress-contour charts of each load step were analyzed in the cases of cutting with no vibration,X direction vibration or Y direction vibration, then the comparison is made.Ultrasonic vibration assisted grinding simulation shows that the stress distribution is uniform and there is no obvious stress concentration, cutting without obvious broken phenomenon, it is obviously effective to improve the processing quality and processing efficiency, reduce tool wear.