Implementation of the process of forming regular micro-reliefs on the working surfaces of connecting rod bearings
DOI:
https://doi.org/10.31891/2079-1372-2026-121-3-6-12Keywords:
connecting rod bearings, technology, tool, parameters, formation modes, regular micro-reliefAbstract
The article presents the results of designing a technological operation for the formation of a Type II regular mesh micro-relief with triangular grooves, performed using a vibration-free method in a single pass on the inner cylindrical surface of connecting rod bearings. The technological operation is implemented utilizing a specially designed tool by machining a pair of connecting rod bearings within a split holding fixture. The connecting rod body for the specified bearing size was used as the holding fixture. The required depth of the micro-relief grooves is achieved through a dimensional analysis of the developed special tool designed for the plastic deformation of the connecting rod bearing surface. Relative micro-relief areas of 14.9% and 28.5% were obtained by determining the appropriate feed rate and tool rotational speed. Experimental samples of connecting rod bearings for a Volvo V50 1.6 HDI vehicle, with the geometric parameters Dring = 47.0 mm and Bring = 16.9 mm, were produced with the formed regular micro-relief. The process was executed at an axial tool feed rate of fin = 19.43 mm/rev (for the 28.5% area) and fin = 39.56 mm/rev for the 14.9% area, utilizing a HAAS VF-B/40HE CNC vertical milling machine. It has been established that this technological operation can be performed either during the finishing stage of machining the copper-lead base of the bearing (which has a thickness of 250–400 μm) immediately prior to the application of protective metal layers of nickel, copper, and/or composite materials, or after the application of the protective coating.
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