Temperature is not only an important parameter in machining, but also an important basis for process optimization. Accurate prediction and reasonable analysis of grinding temperature is of great and far-reaching significance to the development and promotion of nanofluid micro-lubrication. In this chapter, the mathematical model of finite element simulation of temperature field of high efficiency deep grinding under four kinds of cooling lubrication conditions is established, and the three boundary conditions and the constraints of simulation model are established, and the mesh division and time step algorithm are determined respectively. Using ABAQUS simulation platform and theoretical model to simulate grinding temperature field, the distribution characteristics of grinding temperature field under different working conditions are analyzed from different directions, different grinding depths, and different workpiece materials.
Top5.1 Introduction
In the international research, simulation process has been recognized as an excellent tool to evaluate and optimize the cutting and grinding process. Using the different interaction between tool and workpiece under different factors combination in grinding process, researcher can work out the processing plan which can obtain the optimal workpiece processing quality, the shortest processing time and higher economic benefits at the same time (Li et al., 2010).
Based on the complex relationship among system parameters, machining parameters, process parameters and workpiece quality in grinding process, as well as the high correlation in industrial production process, modeling and simulation in grinding process has become the focus of mechanical engineering research and industrial production research in universities (Hou et al., 2011). This can be demonstrated by the proliferation of relevant literature in the past decade. With the development of computer, high performance computer can provide many new modeling and simulation methods, such as FEA, kinematic geometry model, MD, etc. In addition, each simulation needs to determine the input parameters of the simulation through experiments. The simulation results was in good agreement with the experimental data. Therefore, it was very suitable to use the finite element analysis method to simulate the grinding process. The advantage of using macro concept was that the grinding process can be improved by considering more parameters, such as the friction coefficient between grinding wheel and workpiece. In the future, the heat will affect the phase transformation under the surface of the workpiece and the quality of the workpiece.
Another trend of finite element simulation was to apply software based tools to the production process, provided that input parameters such as temperature and grinding force were known. These tools enable users who do not have a lot of software knowledge to build finite element models. They may be used in industrial production to reduce the cost of modeling and simulation. The goal of modeling was to predict the thermal load, phase transformation and shape error. With the combination of finite element analysis software and CAM software, the calculated error can be considered in the computer program. In this way, the processed workpiece can achieve high precision, and the cost of the post-processing process will also be reduced (Li et al., 2019).
In the simulation of grinding process, the finite element method was widely used. When the finite element method was used to simulate the whole working condition, it can simulate various factors that can affect the grinding temperature field. At present, many scholars have done a lot of research work on the finite element analysis software, and achieved some results. Gu et al.(2004) Combined the three factors of workpiece, grinding wheel and coolant, proposed a two-dimensional grinding thermal finite element model, which fully considered the heat distribution in the grinding process. Jin et al. (2004) had carried on the finite element simulation analysis to the high efficiency deep grinding working condition, which mainly studies the transient heat conduction process. They put forward the idea that when the grinding contact arc length reaches the longest state, the heat conduction can be regarded as the steady state, greatly simplifying the difficulty in the finite element modeling process. Li et al. (2010) had also carried out more in-depth research in the field of grinding finite element simulation, developed the engineering software (GRINDSIM) applied to grinding technology, and has been applied to automobile, bearing and other industries.