Abstract. The paper presents the possibilities of 3D printing of chosen hot working tool steel for manufacturing ready made parts. Results of examination of the surface topography of material manufactured by the technology Laser CUSING®B (Laser melting with metals) on the machine, Concept Laser M1 3D printing of metal parts has the potential to revolutionize the market of manufacturing and supplying parts. It makes it possible to dissipate manufacturing and to produce parts on request at lower cost and less energy consumption. The parameters of the surface topography of the hot working tool steel directly after printing can differ depending on the distance from the base plate. The differences of surface roughness values can amount from 32% to 85% for Ra and from 59% to 85% for Rz in comparison of the sample bottom to its top.

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The paper presents the results of hardness tests of aluminum alloy AW-7075 (for plastic processing) and Ni-P chemical coatings (nickel-phosphorus) which had been applied by the no-current method. Coatings of various thickness have been made and their influence on the increase of the top layer hardness has been determined, as well as the increase of the hardness of the coating and substrate system after puncturing the coating with an indenter. The purpose of the investigation was to determine the possibility of applying the Ni-P coating for selected technical applications, among others, by the selection of its optimum thickness on the hard aluminum alloy and by the determination of the deformation resistance of the top layer if the given coating.

The paper compares the assembly process of milling machine using two systems: cell system and production line which was introduced after the changes in the machine assembly system of the company. Assembly in both systems takes place in the SKD (semi-knocked-down) system, which consists of assembly finished, large parts of the machine (higher completeness units) imported into the country of installation. The illustrated example presents advantages and disadvantages of assembly of milling machines in two systems: cell assembly and on the assembly line. In this example, the employees in each cells conducted assembly of machines divided into stages, which was dependent on the supply of items in the designated field by warehouse workers. Warehouse department receives a signal at what stage the assembly process is and whether the delivery of certain items is necessary. The assembly system was reorganized and replaced by the assembly line. This assembly, as previously cell assembly, is carried out in SKD system, which is a partially exploded into components. Previously assembly method took place in three stages. After the change to the assembly line this process takes 14 steps.

The paper presents the possibilities of additive manufacturing of the selected alloy, Inconel, for production of ready-made elements. The results of surface topography examination of the material manufactured with the use of the device 557 RPMI working in the LDT technology (LDT = Laser Deposition Technology) have been compared to those of thecold drawn material. The surfacejust after manufacturing inthese two technologies has been compared to the one after machining by means of variable machining parameters. The surface roughness parameter, Sskis positive for all the surfaces of thesamplemade by the traditional technology, regardless of the feed. This means that most of the material is located close to the valleys. The surfaces are characterised by right-hand side asymmetry. In all the surfaces of the sample made by the additive technology, regardless of the feed value, the surface roughness parameter, Ssk, is negative, which means that most of the material is located close to the peaks.