Abstract
Abstract The article presents the methodology of optimal selection of material and the form of semi-product for the rotors of the spindle-less spinning machine. The multicriteria approach was utilized taking into account versatile criteria. The applied procedure consists of two stages: the optimum method in the Pareto sense and the method of distance function. Based on the analysis of the spinning head work, rotor and availability function, six different materials and three forms of semifinished products (extruded bar, forged element, and cast element) were considered. In consequence, the admissible set consisting of nine elements was obtained. For the evaluation of technological quality of the rotor, the following criteria were proposed: index of functionality of the material σf/ρ, maximum height of the surface peaks, Sp, and maximal hardness on surface of oxide layer μHV0,1. Finally, taking into account the economical criterion (unit cost), the Pareto-optimal set of solutions was determined based on four criteria. Due to the fact that this set contained five variants, the distance function was utilized for choosing the best final variant. The optimal material and the semi-product (because of the assumed criteria) chosen were as follows: alloy AlSi1MgMn and the forged element—because in this case the value of distance function was minimal.
Highlights
In the textile industry, there are many ways of forming yarns and with each of them you can get a yarn with a unique structure and very good physical properties ensuring optimal production efficiency
Production of yarns using open-end technology can compete with ring spinning only in terms of economic benefits, but never in quality; rotor yarns have a limited range of applicability due to the limited range of linear density (15– 200) textile as well as the inferior properties resulting from the braids that are impossible to eliminate, which make the surface of the finished product more rough
As a result of extensive research in recent spinner design solutions, the rotor diameters have been significantly reduced compared to previous versions
Summary
There are many ways of forming yarns and with each of them you can get a yarn with a unique structure and very good physical properties ensuring optimal production efficiency. By the interaction of the yarn and the spinning funnel leading the yarn out of the rotor The latter, in turn, depends on the physical properties of the fibers (length, thinness, and friction), spinning speed, opening rollers with rigid clothing, etc. The selection of the semifinished product is an indispensable stage before starting to develop the process of manufacturing a given part As a result, such approach allows for its detailed determination and accurate economic analysis, the cost of the material and labor and the tooling cost associated with the technological method. The purpose of the work is to present the multicriteria evaluation procedure and its verification on the example of choosing the best material and form of a semifinished product, due to the unit cost of production and technological quality of the product, i.e. the index of material functionality and properties of the top layer of an open-end rotor spinning machine
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