Simplified Grinding Temperature Model Study | Journal of Engineering Sciences

Simplified Grinding Temperature Model Study

Author(s): Lishchenko N. V.1*, Larshin V. P.2, Krachunov H.3

1 Odessa National Academy of Food Technologies, 112 Kanatna St., 65039 Odessa, Ukraine; 
2 Odessa National Polytechnic University, 1 Shevchenko Ave., 65044 Odessa, Ukraine;
University of Varna, Studentska Str., Varna, 9010, Bulgaria

*Corresponding Author’s Address:

Issue: Volume 6; Issue 2 (2019)

Paper received: June 12, 2019
The final version of the paper received: September 3, 2019
Paper accepted online: September 8, 2019

Lishchenko N. V., Larshin V. P., Krachunov H. (2019). Simplified grinding temperature model study. Journal of Engineering Sciences, Vol. 6(2), pp. A1-A7, doi: 10.21272/jes.2019.6(2).a1/

DOI: 10.21272/jes.2019.6(2).a1/

Research Area:  MANUFACTURING ENGINEERING: Machines and Tools

Abstract. A study of a simplified mathematical model for determining the grinding temperature is performed. According to the obtained results, the equations of this model differ slightly from the corresponding more exact solution of the one-dimensional differential equation of heat conduction under the boundary conditions of the second kind. The model under study is represented by a system of two equations that describe the grinding temperature at the heating and cooling stages without the use of forced cooling. The scope of the studied model corresponds to the modern technological operations of grinding on CNC machines for conditions where the numerical value of the Peclet number is more than 4. This, in turn, corresponds to the Jaeger criterion for the so-called fast-moving heat source, for which the operation parameter of the workpiece velocity may be equivalently (in temperature) replaced by the action time of the heat source. This makes it possible to use a simpler solution of the one-dimensional differential equation of heat conduction at the boundary conditions of the second kind (one-dimensional analytical model) instead of a similar solution of the two-dimensional one with a slight deviation of the grinding temperature calculation result. It is established that the proposed simplified mathematical expression for determining the grinding temperature differs from the more accurate one-dimensional analytical solution by no more than 11 % and 15 % at the stages of heating and cooling, respectively. Comparison of the data on the grinding temperature change according to the conventional and developed equations has shown that these equations are close and have two points of coincidence: on the surface and at the depth of approximately threefold decrease in temperature. It is also established that the nature of the ratio between the scales of change of the Peclet number 0.09 and 9 and the grinding temperature depth 1 and 10 is of 100 to 10. Additionally, another unusual mechanism is revealed for both compared equations: a higher temperature at the surface is accompanied by a lower temperature at the depth.

Keywords: grinding temperature, heating stage, cooling stage, dimensionless temperature, temperature model.


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