Abstract
The work in this paper presents the effect of material and blank dimension on the dimensions ofexternal rolled threads. This paper will be helpful for the auto industry, one of the largest fastenersmarkets, that typically consumes between 2800 to 3100 fasteners in the assembly of an average familyvehicle. Externally threaded fasteners comprise the bulk of fasteners used in these applications withover 90% of being produced by thread rolling. The thread rolling process is now widelyacknowledged as the fastest and most efficient method of producing accurate external threads, withsurface finish and mechanical properties. The typical production rates are around one piece persecond. In order to ensure a perfect thread rolling process, it is important for blank of work piece to beproperly pre-machined. The size of the blank is dependent on material, surface finish, type of threadsetc. This paper describes the effect of blank material and dimensions on nominal diameter of externalrolled threads. The work has been carried out at M/s Gayatri Auto Industries on Master ReciprocatingDies Thread Rolling Machine using HSS die. Mild Steel (C 15), EN-8 (C40), and EN-47 (SpringSteel) materials have been taken as blank material for the analysis to produce M8x1.25 6g threads.The result indicates that the variation on surface roughness, carbon percentage and dimension of blankaffects significantly the nominal diameter and PCD of threads. This paper is helpful for theprofessionals to determine the accurate dimension of thread rolling blank for desired threads tominimize rejections.
Published Version
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