Comparison of Machining Temperature in High Speed Grinding of Metallic Materials and Brittle Materials

Chongjun Wu,Beizhi Li,Steven Y Liang,Jianguo Yang,P Liu,X Tu

doi:10.1051/matecconf/201711402006

Chongjun Wu, Beizhi Li + Show 4 more

Open Access

https://doi.org/10.1051/matecconf/201711402006

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Abstract

Grinding has always been a high energy expenditure process, which generally produce massive grinding heat and possibly produce thermal damage in workpiece ground surface. Therefore, a good understanding of grinding temperature characteristics is important to lower the thermal effect on the workpiece quality. However, the grinding temperature characteristic differs when grinding of different materials, especially for those hard-to-machine materials (eg. Titanium alloys and ceramics). Therefore, this paper is devoted to investigate different grinding temperature characteristics for metallic materials and brittle materials. In order to detect the grinding temperature, a grindable thermocouple technique with NI-DAQ device is adopted in diamond wheel grinding of ceramics and CBN grinding of Titanium alloys. The results show that the temperature characteristics for ceramics is totally different with Titanium alloys. When the grinding wheel speed increases, the grinding temperature increases all the way when grinding of Titanium alloys. However, there is a temperature turning point for grinding of ceramics. When the wheel speed surpasses the turning point, the grinding temperature goes down and closes at a relatively low temperature.

Highlights

Grinding has been widely used as a precision machining method in various engineering application, such as aerospace, automobile and machinery industry [1,2]
As the increase of wheel speed is higher than the reduction of tangential grinding force, the grinding power needed to remove a certain amount of material will increase
The results show that the grinding temperature for different materials differs a lot

Summary

Introduction

Grinding has been widely used as a precision machining method in various engineering application, such as aerospace, automobile and machinery industry [1,2]. Grinding is a complex machining process with dynamic active number, random grit topology and cutting angle. The interactive abrasive grits have typical negative rake angle [3], which will cause a high degree of material deformation and produce voluminous grinding heat and unpleasant residual stress [4]. The grinding induced temperature is obviously different when machining different materials. While for the metallic materials, the ground surface is easy to get burnt to worsen the desired quality [7]. A good understanding of grinding temperature for different materials would be helpful to minimize the thermal effect on grinding quality

Methods

Results

Conclusion