Contact of Working Surfaces for Spherical Washers and Recommendations for Determining the Gap in the Joint

Abstract

In article analyzes the technical requirements for spherical washers used in threaded connections of pumps, which made it possible to highlight contradictions in paragraphs of the current standards for pump fasteners. They regarding recommendations for manufacturing technology and control of the working surfaces of washers. Publication analysis in the spherical surfaces lapping showed the absence of research in the spherical surfaces contact after lapping and the dependence of contact parameters by the technological parameters for this operation. The presence of a gap in conjunction with spherical washers after the lapping process was proved geometrically. Its location was determined, and a mathematical dependence was obtained to determine the maximum gap value in conjunction. It was found that the gap depends on the design parameters of the washers’ conjunction and the abrasive material grain size used for lapping. Recommendations for selecting the abrasive material grain size for the lapping operation for the most common values of the roughness parameters for the working surfaces of spherical washers have been formed. In the article was proposed to introduce into the technical requirements for the spherical washers drawings changes concerning the gap size allowable in the conjunction, and as well as tolerances value changes of the radii of the working surfaces of the washers, thus increasing their manufacturability without conflicting with the requirements of the current standards.

MATHEMATICAL ESTIMATION OF ROUGHNESS Rz OF THREADED SURFACE OBTAINED BY MACHINING METHOD

“…The conducted studies make it possible to establish the tool and path tool diameters but lack a mathematical relationship between cutting parameters and their influence on surface roughness [Budnik 2016]. It was reported about the possibility ensuring of significant cuttingedge dimensional wear compensation via altering the shaping point trajectory with maintaining the specified geometry of the thread [Dehtiarov 2020]. Based on the state of art analysis, the method of processing internal threads with a to-size tool of a cutting insert needs more detailed theoretical studies.…”

Contact Interaction of a Ball Piston and a Running Track in a Hydrovolumetric Transmission with Intermediate Deformable Surface Layers

“…Practical recommendations have been accordingly developed for numerous applications. However, most of these results are valid for smooth bodies, thus completely disregarding such factors as surface roughness [1], films, and coating [2]. The deformation of these thin media is different from the bulk of the contacting bodies.…”