Journal of Engineering Sciences

Author(s): Dehtiarov I. M.^1*, Neshta A. O.¹, Samardak M. P.², Antosz K.³, Avramenko S. E.¹

Affiliation(s): 
¹ Sumy State University, 2, Rymskogo-Korsakova St., 40007 Sumy, Ukraine;
² PJSC “Nasosenergomash”, 1, Pryvokzalna Sq., 40011 Sumy, Ukraine;
³ Rzeszow University of Technology, 12, Powstańców Warszawy Al., 350959 Rzeszow, Poland

^*Corresponding Author’s Address: [email protected]

Issue: Volume 7, Issue 2 (2020)

Dates:
Paper received: June 12, 2020
The final version of the paper received: December 8, 2020
Paper accepted online: December 14, 2020

Citation:
Dehtiarov I. M., Neshta A. O., Samardak M. P., Antosz K., Avramenko S. E. (2020). Contact of working surfaces for spherical washers and recommendations for determining the gap in the joint. Journal of Engineering Sciences, Vol. 7(2), pp. B1–B7, doi: 10.21272/jes.2020.7(2).b1

DOI: 10.21272/jes.2020.7(2).b1

Research Area:  MANUFACTURING ENGINEERING: Technical Regulations and Metrological Support

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.

Keywords: lapping, turning, tolerance, contact square, manufacturability.

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