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In modern day industry of heavy engineering, parts made from billets comprising large-sized pipe forgings are widely used. The paper presents results of the study of various methods of broaching on mandrel of large-sized pipe forgings and presents the results of industrial testing of the developed methods of broaching and designs of mandrels.

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We study an actual problem of cleaning of conveyor belts from adhered finely divided materials in the process of operation of belt conveyors. The material remaining on the belts causes numerous problems for the conveyor transport. In the course of time, adhered particles fall into the subconveyor space, thus violating the normal operation of the conveyor. This also leads to rapid failures of the roller supports, excessive abrasion of the working surface of the belt, and hence, to a more rapid wear of the conveyor belt. The procedure of cleaning of the belts enables one to remove the indicated problems. At present, there are various types of available cleaning units. Each of these units has its own advantages and disadvantages. In most cases, this complicates the choice of the required unit. We estimate the efficiency of application of a discrete double-row scraper cleaner of the conveyor belt. Its application increases the degree of cleaning without damaging the surface of the belt due to the presence of a counterbalance clamping attachment.