Hydraulic cylinder rod part surface quality improvement on the local thermal effect basis

Abstract

In modern mechanical engineering, one of the urgent tasks is to improve the quality of manufacturing of surfaces of contact pairs of hydraulic cylinders. This task is connected, first of all, with the grinding operation, which leads to the formation of burns, microcracks, and scarring. The presence of defects on the surface leads to the formation of a poor-quality protective chrome layer. Destruction of the protective layer during operation breaks the sealing ability of the sealing rings. For this reason, abrasive microparticles enter the contact zone, forming adhesive wear on the surfaces. To increase the performance characteristics of hydraulic cylinders, it is necessary to comply with the quality requirements in the technological process. So, for the part “rod” surface roughness should be Ra = 0.63 μm. It is possible to achieve a given surface quality by replacing the grinding operation with mechanical processing with local thermal influence.