Manufacturing technologies for slide bushings from powder materials for lever brake systems of vehicles

Slide bushings made of metal powder materials are used in many parts of vehicles. The current trend is to reduce the unit cost of products, increase the durability of components and assemblies, and reduce the harmful effects on the environment. One of these solutions is the use of powder materials. In this article, we consider some manufacturing techniques for sliding bushings of a lever brake system of a rolling stock using one-sided and two-sided pressing, pulse and combined sealing. The areas of their rational use are demonstrated as well

Band structures for binding and holding of objects made from recycled metallic materials

ArticleThe aim of the present research is the investigation of the possibility and effectiveness of using the band structures made from recycled metallic materials for binding and holding of objects (in particular, tubular objects as pipelines or shells). The using of band elements and structures as such is a perspective way to increase the safety and bearing capacity of the pipelines and vessels. Nowadays during repair works the outer surfaces of the mentioned objects are braided by the steel tapes, i.e. the objects are strengthened by the binding. The mentioned steel bands are specially produced for binding purpose. From the other hand after stamping of smallsize details (like the elements of supply chains for different apparatus) the metallic waste in the shape of perforated metallic tapes are received and needs to be reused in compliance with the good practice in effective resource using and recycling. The band structures for binding and holding of tubular objects, produced from the perforated metallic tape by the longitudinal profiling, multilayer and spiral winding are presented. It is proposed to apply in industry the composite band structures made from perforated metallic materials and epoxy matrix for binding and holding of tubular objects as pipelines or shells, which allows simplifying and speeding up the repair works especially in the cases of the local damages

Powder particle flow acceleration methods for simulation of interaction with materials used in spacecrafts

ArticleIn recent decades, the role of satellites for monitoring the condition of agricultural land and forests, as well as in the study of natural resources, has especially increased. The amount of debris in near-Earth space is constantly increasing, which creates a real danger to the operation of satellites and other flying objects. The failures of satellites and spacecrafts increase the cost of their production and inhibit the development of the industry, lead to pollution of near-earth space by space debris. The U.S.-based Space Surveillance Network is currently tracking about 40,000 space objects-the vast majority of which are defunct satellites and fragments from collisions. It was estimated that there are more than 8,378tons of junk around the Earth at speeds of up to 70kmh-1, threatening functioning spacecrafts. Development of a new method for ground-based testing of protective materials, microchips and control systems will enable to avoid further pollution of near-Earth space.This paper discusses methods for accelerating fine particles using explosive devices and an electromagnetic field and the possibility of using them to develop and research protective materials

Tools for building production and woodworking made from the perforated steel wastes

ArticleThe rising of efficiency of the building and construction production is an actual task. One of the possible ways to ensure higher efficiency is using innovative tools and facilities of small-scale mechanization, which increase productivity and enchase working condition. Most observable influence of such strategy is on concrete works, plastering and earthworks. Another important tendency in production engineering, building and construction production is recycling of the technological wastes, which sufficiently reduce cost of the products and improve ecology. The goal of the present paper is to offer new possibility for recycling of the technological wastes, i.e. perforated steel tapes achieved after stamping of fine parts, by producing from mentioned perforated tapes the building tools and facilities of small-scale mechanization. In particular, the technological wastes of the JSC ‘Ditton’ (Daugavpils, Latvia) – perforated steel tapes – received after stamping of the elements of driving chains for different apparatus were used in this research. The prototypes of the scrapers for the finishing building work, as well as cutting edges and circular coronas for the woodworking were elaborated and offered in this work. The results of approbation of elaborated prototypes of the tools are offered. It was proven, that proposed innovative tools could be used effectively in building production and woodworking

Investigations of Properties of Powdered Ferromagnetic Sorbents

The paper examines possible application of certain disperse materials based on iron powders as ferromagnetic sorbents for collecting the oil products spilled on the water surface. Sorption ability is defined for the investigated ferromagnetic sorbents

Manufacturing of cellular structures from perforated metallic materials

Abstract: This research regards the manufacturing of cellular structures with through channels of different form from perforated steel tape. These methods allow recycling of metal wastes (tapes), which are obtained during stamping of fine-sized details. There are given examples of steel wastes with different physical-mechanical properties and geometry. The methods of profiling and welding of thin perforated materials are studied. A method of through channel parameter evaluation is suggested. The estimation of parameters of cellular structures during deformation is suggested

APPLICATIONS OF PULSED ELECTROMAGNETIC FIELDS IN POWDER MATERIALS HIGH SPEED FORMING

Abstract In current article, applications of electromagnetic pulsed fields for processing of powder materials are presented. The main attention is paid to the following applications of pulse electromagnetic fields in powder metallurgy and allied industries: pressing of powders, manufacturing of powder coatings, and conveying of ferromagnetic powders by means of pulsed electromagnetic field

Towards Next-Generation Sustainable Composites Made of Recycled Rubber, Cenospheres, and Biobinder.

The utilisation of industrial residual products to develop new value-added materials and reduce their environmental footprint is one of the critical challenges of science and industry. Development of new multifunctional and bio-based composite materials is an excellent opportunity for the effective utilisation of residual industrial products and a right step in the Green Deal's direction as approved by the European Commission. Keeping the various issues in mind, we describe the manufacturing and characterisation of the three-component bio-based composites in this work. The key components are a bio-based binder made of peat, devulcanised crumb rubber (DCR) from used tyres, and part of the fly ash, i.e., the cenosphere (CS). The three-phase composites were prepared in the form of a block to investigate their mechanical properties and density, and in the form of granules for the determination of the sorption of water and oil products. We also investigated the properties' dependence on the DCR and CS fraction. It was found that the maximum compression strength (in block form) observed for the composition without CS and DCR addition was 79.3 MPa, while the second-highest value of compression strength was 11.2 MPa for the composition with 27.3 wt.% of CS. For compositions with a bio-binder content from 17.4 to 55.8 wt.%, and with DCR contents ranging from 11.0 to 62.0 wt.%, the compressive strength was in the range from 1.1 to 2.0 MPa. Liquid-sorption analysis (water and diesel) showed that the maximum saturation of liquids, in both cases, was set after 35 min and ranged from 1.05 to 1.4 g·g for water, and 0.77 to 1.25 g·g for diesel. It was observed that 90% of the maximum saturation with diesel fuel came after 10 min and for water after 35 min

Измельчение отходов резины методом комбинированной девулканизации

Количество полимерных отходов постоянно растет, а процент их использования до сих пор мал. Проблема их утилизации носит экологический характер. Наибольший интерес представляют технологии девулканизации утильной резины, позволяющие вовлекать, полученные в результате этого процесса материалы, в состав новых смесей для получения качественных резиновых изделий. В настоящей работе рассмотрены особенности неприрывного химико-механического метода девулканизации крупной резиновой крошки и баффинга

Метод интенсификации технологических процессов электромагнитными импульсами

Формирование направленных электромагнитных импульсов с помощью генераторов конденсаторного и бесконденсаторного типа позволяет найти им эффективное применение для интенсификации различных технологических процессов в металлургии, транспортировании сыпучих материалов, металлообработке, машиностроении. Регулирование арматуры и длительности силового импульса возможно не только путем изменения напряжения и емкости импульсного генератора, но также варьированием параметров индуктора и концентратора электромагнитного поля. Приведены примеры использования новой технологии: для магнитно-импульсного прессования порошков, ускорения процессов истечения материалов из бункеров, смешивания и транспортирования порошков