Calculating Cutting Thermal Physics Parameters of Plastic Materials

The thermal physics parameters and a cutting temperature belong to the output performances to characterise a process and allow a rational selection of machining modes and conditions. In machining hard-to-cut materials the utmost cutting temperature is a technological restriction and defines tool wear rate and intensity. The cutting temperature also has impact on the heat extension of tool and the finished machining.

The subject is to study thermal physics parameters and cutting temperature when machining the plastic materials by a hard-alloy tool. The objective is to develop a technique to calculate these parameters. A calculation method for the analysis of process parameters is used.

Calculation results for the cutting temperature were compared with experimental ones published in the literature sources. A novelty of the technique is that there is no need in conducting the experimental studies to calculate the thermal physics parameters. Calculation is based on using known mechanical and thermal physics characteristics of machined and tool materials. The calculation results are parameters, namely heat flow intensities in the conditional shear plane, on the contact surfaces of tool, temperatures of theses surfaces, averaged cutting temperature - depending on the cutting speed, thickness of cutting layer, tool wear value.

A sequence of calculations is implemented in the developed software in the programming algorithmic language with results in graphic and tabular representations. The calculation technique is designed for conducting research activities and engineering designs in the field of machining.

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