Modelling and Prediction of Cutting Temperature in the Machining of H13 Hard Steel of Transient Heat Conduction.

Jingjie Zhang,Chonghai Xu,Zhaoqiang Chen,Mingdong Yi,Jin Du,Guangchun Xiao,Xiangfei Meng

doi:10.3390/ma14123176

Abstract

Cutting heat conduction undergoes three stages that include intensity transient-state, transient-state, and steady-states. Especially during machining with coated cutting tools, in the conduction process, cutting heat needs to pass through a few micron thick coatings and then flow into the tool body. This heat conduction presents typical non-Fourier heat conduction characteristics. This paper focuses on the cutting temperature in transient heat conduction with a coated tool. A new analytical model to characterize the thermal shock based on the non-Fourier heat conduction was proposed. The distribution of cutting temperature in mono-layer coated tools during the machining was then illustrated. The cutting temperature distribution predicted by the Fourier heat conduction model was employed to compare with that by non-Fourier heat conduction in order to reveal the non-Fourier heat conduction effect in transient heat conduction. The results show that the transient heat conduction analytical model is more suitable for the intensity transient-state and transient-state in the process of cutting heat conduction.

Highlights

More and more coated tools are employed in metal cutting applications, especially in the machining of difficult-to-machine materials
This paper describes a new approach for predicting cutting temperature distribution in transient heat conduction of monolayer coated tools based on non-Fourier heat conduction
According to the transient heat conduction model, the computing process is programmed in MATLAB (Version 2017b, MathWorks.Inc, Natick, MA, USA)

Summary

Introduction

More and more coated tools are employed in metal cutting applications, especially in the machining of difficult-to-machine materials. The application of a tool coating improves the wear resistance and hardness of the tool [1,2]. The thin film coated on the cutting tool surface can enhance the tool strength and decrease the friction between tools and workpieces, and it plays an important role in the process of heat conduction into the cutting tool body. The study of temperature distribution in the tool’s body is essential for the investigation of the thermal effect on tool life and workpiece quality. The heat generation and heat conduction of coated tools during the cutting process are very different compared with uncoated tools owing to the presence of the tool coating film

Methods

Results

Conclusion