Technological lubricant for forming internal grooves in tubular products by cold plastic deformation

Abstract

The paper presents the results of research on the creation of an effective liquid technological lubricant for the processing of structural alloy steel parts by the method of deformation drawing (DP) based on the determination of the effect of the introduction of an antifriction filler and a nanostructural component into the lubricating organic base. The influence of the composition on the coefficient of dynamic viscosity of the lubricant, its thermal and operational properties, features of structure formation was established. It is shown that with the simultaneous introduction of a nanostructured component and an antifriction filler to the lubricating base, the uniformity of the location of the nanostructural component relative to the particles of the antifriction filler and the promotion of its exfoliation are observed. The formation of such a structure contributes to positive changes in antifriction properties due to the improvement of mutual sliding of filler layers during the action of high shear stresses. Using the method of thermogravimetric analysis, it was established that thermodestructive processes do not occur in the lubricant material up to a temperature of 100°C. The temperature dependence of the dynamic viscosity of the lubricant in this range is described by the exponential Arrhenius equation. The introduction of a nanostructured component in combination with an antifriction filler changes its character: the pre-exponential factor increases by 4 orders of magnitude, and the activation energy decreases by 1.5 times, that is, the temperature-independent viscosity coefficient increases significantly and the effect of temperature on the viscosity of the lubricant significantly decreases. The proposed lubricant composition makes it possible to reduce the axial forces of DP by ~ 20% and obtain the roughness of the treated surface at the level of class 10-11 when processing parts from alloyed structural steels.

Keywords

• deforming broaching
• liquid lubricant
• lubricating organic base
• antifriction filler
• nanostructured inorganic component
• dynamic viscosity
• thermal properties