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For decades manganese steel casts have been most used materials for manufacturing elements subjected to impact and high stress abrasion. These materials are used in countless industrial applications that involve crushing of raw material by impact. Some of most important characteristics of manganese cast steels are work-hardening and high strength. Opposite from manganese steels, highly alloyed white cast irons are materials with high amount of hard carbide phases that shows better abrasion resistance but have lower strength and impact energy. Aim of this paper is to investigate possibilities to reduce costs and maintenance periods by implementing bimetallic materials.

Buka u hidroelektranama izravno utječe na zaposlenike ako je njezin intenzitet iznad dopuštenih, zakonom propisanih granica. U ovom radu prikazan je model rješavanja problema buke u postrojenju hidroelektrane., The noise in hydroelectric power plants directly affects the employees if its intensity is higher than permitted values, according to the legal regulations. This paper provides the description of a model for solving the problem of noise reduction in one hydroelectric power plant.

Paper presents a forming manufacturing process of deep drawing and the implementation of various technologies needed for production of a deep draw part. Process consist of several stages: deep drawing, cutting, modelling, engineering analyses etc. A method is presented for determination of optimal blank shape, and the control of optimalblank shape, and the controlof a number of parameters that influence the finished part quality. In order to avoid errors and for the correct calculation of process parameters, several engineering solutions are adapted to better suit the process. The product requires a high quality production because it is an assembly with narrow tolerances and a perfect fit fit is required for all elements. Modelling was done in the SolidWorks 2008 software, and experiment was done in factory conditions. The proposed method was used to determine the optimal process parameters with an acceptable precision and to insure that the current used procedure is updated.

The traditional grouping method in batch manufacturing is functional grouping. In this approach, similar types of machines are grouped together. It has a number of limitations like considerable distance traveled by products, high levels of material handling and long lead time. To avoid this industrial manufacturing enterprises use group technology concept which basic idea is to manufacturing system be segmented into adequate subsystems. In order to do that it is necessary to form groups of products which are associated to these manufacturing subsystems. Group technology identify and brings together related or similar products and takes advantage of their similarities. Product are grouped into families of parts, and machines into manufacturing cells. Machine– part matrix representation is most frequently used to present the problems of group technology.

Manufacturing ask that time for her planning be shorter. Because of big volume of information, permanent plan modification, complexity of the manufacturing system models there is need for software support in manufacturing systems planning. Requirements from software are: include objective criteria and aligning optimal solution with minimal differences between planned and real characteristics. In this paper, a software program for manufacturing system planning (PPS) is described. This was developed and tested on examples, representing an efficient mean of more rationale, creative and quality planning activity. With this kind of software’ s reaches quality project result, reduced planning time, generation of multivariate results, segmenting of a CMS into BMS, based on suitable grouping of similar work pieces and planning costs reducing.

Development of machine tools and need for simultaneous control of couple machine tools in production system have effect to develop Direct Numerical Control (DNC). DNC system generates efficiency, greater degree of automation transfer process and automatic defining operative data lead at greater degree of machine utilization and reducing of personnel for serving the machines. Reduces number of malfunction as result of nothingness control program (NC code) or error in program, its reduce costs because machines are in constant work and enable ordinary survey of tool, machines and production condition (Real Time Control). DNC advantages regarding NC system come on manipulation of big NC programs for production complex parts on machining centers with automatic tool and part changes. In this paper DNC system is described, his advantages and disadvantages and modern methods of integration system in one unit.

The aim is to forming the group of work pieces which are manufactured in one production system. Second aim of grouping is to smallest number of different work pieces be operated in one production system. Preliminary technology process has to be making for each work piece. Based on them, the matrix which connects the work pieces and machine tools is formed. The matrix of utilization gradients for machine tools and production system are accounted. The single work pieces, with utilization gradient which are higher of demanding, would be extracted from matrix. The rest of work pieces forming the sub matrix. The groups of work pieces are formed through joining of each work piece with all others. Proceed with extraction of two-pieces, three-pieces till n-pieces groups. As result appears the groups of work pieces with manufacture similarity, clear technology and manufacture concept, define kind and quantity of production's equipment, necessary production space, transport equipment...

Each manufacturing process has general characteristics which coming from manufacturing program (assortment of products which are processed, their quantity, manufactuting dynamics), production equipment (the way of manufacturing, flexibility, productivity and time for preparing and finishing the process), space layout (model, korelation's factor, flow of work piece), system permeable capacity (the number of operations on one equipment, bottleneck) and utilization gradients (technical and economical). The conceptual characteristics coming from manufacturing program (one or more products), structure of manufacturing model (single capacity or production system), and flow of materials (flowing in line, flexible flowing, flowing in waves, flowing against purpose and kind of process). Thirteen basic models of manufacturing systems are possible to be formed by combinations of above mentioned charateristics. Based on production policy, targets from project's task and results which coming from Process Method of Grouping the Work pieces, the optimal way of launching has to be define. Finally, based on all mentioned the optimal basic manufacturing system model has to be determining which produce specified assortment of work pieces in same stable production condition on optimal way.

For decades manganese steel casts have been most used materials for manufacturing elements subjected to impact and high stress abrasion. These materials are used in countless industrial applications that involve crushing of raw material by impact. One of most important characteristic of manganese cast steels is work-hardening. Opposite from manganese steels, cast materials with high amount of hard carbide phases shows better abrasion resistance but have lower strength and impact energy. Aim of this work is to investigate possibilities to reduce costs and maintenance periods by implementation of bimetallic materials in industrial applications.

This paper evaluates the importance of procurement towards reducing costs of industrial production. It gives review of Supply Chain as organizational concept and it’ s parts. Degrees of development are presented through evolution of organization integration procurement process.