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Modelling of contact geometry of tool and workpiece in grinding process with crossed axes of the tool and workpiece with circular profile

Kalchenko Volodimyr, Yeroshenko Andrij, Boyko Sergiy, Kalchenko Olga

Acta Mechanica et Automatica

2021

Vol. 15, no. 1

9--15

A general model is developed, and on its basis, there are special models formulated of the grinding process with crossed axes of the tool and workpiece with a profile in the form of a circle arc. A new method of control of the grinding process is proposed, which will provide processing by equidistant curves, and the amount of cutting of a circle equal to the allowance. This will increase the productivity and quality of grinding. The presented method of grinding implements the processing with the spatial contact line of the tool and workpiece. When the axes are crossed, the contact line is stretched, which leads to an increase of the contact area and, accordingly, to a decrease of the temperature in the processing area. This allows processing of workpieces with more productive cutting conditions.

Effect of the glass-crystalline bond microstructure on the cutting ability of grinding wheels with Al2O3 abrasive grains

Herman Daniela, Nadolny Krzysztof, Socha Elżbieta, Ścibiorski Dawid

Journal of Mechanical and Energy Engineering

2019

Vol. 3, No 3

207--214

Standard ceramic abrasive tools are manufactured using glass bonds or mineral resources, in which the microstructure of the bonding bridges cannot be controlled. In this study, a new type of glass-crystalline bond was used to combine mixed abrasive grains from microcrystalline and monocrystalline corundum into an abrasive tool. The glass-crystalline bond has a fine crystalline structure (particle size of the crystalline phase: 1-1.5 µm) and perfectly moistens the abrasive grains. This fact and the generated crystalline phase with a high coefficient of brittle fracture resistance enable the production of tools with a higher porosity and selfsharpening ability in comparison to grinding wheels with the use of industrial bond, which results in high performance indices with a longer service life.

Crossing axes of workpiece and tool at grinding of the circular trough with variable profile

Kalchenko V., Yeroshenko A., Boyko S.

Acta Mechanica et Automatica

2018

Vol. 12, no. 4

281--285

In the article the method of grinding with crossed axes of the tool and the workpiece got further developed. The work discloses a method of processing details having an external surface with a profile in the form of an arc of a circle of variable radius (for example, rolls of pipe rolling mills). The particular three-dimensional geometric models of the processing, shaping and profiling of abrasive wheels have been developed. A method for controlling the grinding process, which ensures the removal of allowances along equidistant curves has been offered. The developed method of grinding provides a constant depth of cutting according to the coordinate of profile processing. This is achieved at the expense of the synchronous inclination of the wheel and its insertion by the size of the allowance. The diameter of grinding wheel affects on the maximum angle of orientation of the wheel has been proven. It has been shown that increasing the diameter of the abrasive wheel has led to a slight decrease in value orientation angle.