DOI: 10.14489/hb.2014.08.pp.046-049

Коротков В. А., Минкин Е. М.
ВЗАИМОСВЯЗЬ ГЕОМЕТРИИ И НАПРЯЖЕНИЙ В ОРИЕНТИРОВАННЫХ ШЛИФОВАЛЬНЫХ ЗЕРНАХ
(с. 46–49)

Аннотация. Исследована взаимосвязь величин передних углов шлифовальных зерен, находящихся на рабочей поверхности шлифовального круга с их формой, пространственной ориентацией и износом. Изучены напряжения в ориентированных шлифовальных зернах с контролируемой формой и различной глубиной заделки в связку, возникающие при работе.

Ключевые слова: шлифование; шлифовальные инструменты; отрезные шлифовальные круги; шлифовальные зерна; передние углы; коэффициент формы зерен; угол ориентации; износ зерен; напряжения в шлифовальных зернах.

Korotkov V. A., Minkin E. M.
INTERCONNECTION OF GEOMETRY AND TENSION IN THE ORIENTATED ABRASIVE GRAINS
(pp. 46–49)

Abstract. Interconnection of the abrasive grain front angle parameter with the form, orientation and wear out parameters is shown. Form parameter of the abrasive grains was evaluated by the form coefficient, which is the ratio of diameters described around the contours of the grain to the diameters of the spheres inscribed in their areas. The angle of the spatial orientation of the grains was determined between the main (i.e. maximal) axis of the grains and the cutting plane. It is established that an increase of the grain form coefficient leads to an increase in their front corners. Also established that the longer the abrasive grain wears along the main axis and located in the tool body, the larger is its front corner. It is shown that the factor of the grain orientation relative to the cutting plane significantly affects the value of the front corners. It is found that the front corners of the abrasive grains reach the maximum positive values when the angles of orientation are in the range of 22,5…45°. The tension in the orientated abrasive grains with a controlled form and different depth of embedment in the bundle resulting from the operation is researched. It is confirmed that the deeper the grain is in the bundle, the lower the tension is there. It was found that for all angles of orientation of the grains their tension significantly increased with an increase in their form coefficient. Also found that tension is minimal when the grains are tangential orientated. Rational angle of grain orientation is almost identical with the direction of the cutting force. The rational angle of grain orientation for cutting discs is 67 º30 . The presented method of research is suitable to design grinding tools with rational geometry of grains for specific processing conditions and parameters of the power load.

Keywords: Polishing process; Grinding instruments; Cutting discs; Abrasive grains; Front angle of the abrasive grains; Form coefficient; Orientation angle of the abrasive grains; Wear out of the abrasive grains; Tension value in the abrasive grains.

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