Dorota Klimecka-Tatar

Technological and ecological safety in aspect of chemical properties of recycled neodymium magnets – electric motors and hard disk

Abstract Neodymium magnets currently dominate the magnet market due to their superior magnetic properties with maximum volume minimization. In this paper, the results of X-ray analysis for two types of magnetic powder obtained from the recovered magnets traditionally used in electric motors and hard disk have been presented. The NdFeB magnets are composed of 25-35 wt. % rare earth elements (RE) and the rest being transition metals (mainly Fe.). RE, other than Nd, such Dy, Pr, Tb and Gd or exogen elements, other than Fe, such as Al, Co, Ga, Nb, Si, Cu and Zr can also be present as minor admixtures. This paper brings an opportunity to introduce the hard magnets recycling technology on an industrial scale.

The Corrosion Processes Effect on Surface Roughness of Bonded Magnetic Material Based on Nd-(Fe,Co)-B Powder Type

This paper presents an analysis of the Nd-(Fe,Co)-B bonded magnetic materials surface before and after corrosion tests. In the technological process of bonded magnetic materials the main difficulty is the fact that in the presence of small amounts of oxygen magnetic powders (having in their composition a highly active, a rare earth element) the particle surface easily cover with an oxide layer. The oxides phases are creating and furthermore the presence of this kind of paramagnetic phase on the powder particles surface adversely affects on the properties of the final product. Important is to protect the surface against spontaneously oxidation of the magnetic materials. One of the activities way to surface isolation is creating the additional protection coating (biencapsulation). Biencapsulation is a protection process in which not only set resin layer, but also an additional protective coating has been applied. The powder particles are coated with protective coatings: Ni-P/epoxy resin and phosphate/epoxy resin. In the paper the roughness measurement (2D) with profilometer (Taylor Hobson) results were presented. Also the effect of corrosion process evaluation on the bonded magnets surface roughness were determined (sulfate solution pH = 3, the exposure time 4h). It has been found that the application of powder particles biencapsulation with phosphate/epoxy resin coating (in comparison with Ni-P/epoxy resin biencapsulation) leads to a more effective corrosion protection of the final bonded magnets.

QUALITY ANALYSIS OF THE PLATES FOR A CAR INDUSTRY

In 2013, global steel production reached a level of 1.548 million tons. This value indicates that, in the 21 st century, steel is still one of the most popular construction materials. In Poland 8.2 million tons of steel was produced in 2013. A large share of steel is used for the production of hot-rolled plates for car bodies. Steel products made in high temperature processes are used in virtually all sectors of industries. The hot-rolled plates for car bodies should comply with the highest quality requirements. In this chapter the results of research from the 3-month follow-up are presented. To assess the level of non-conformity in hot-rolled plates the Pare- to-Lorenz diagram was used. The results are the basis for the improvement of the production process of hot-rolled products.

Value Streams Mapping in the Implementation of Process Innovations – in the Case of Single–Unit Production

Abstract The visual management technique used in process improvement, i.e. value stream mapping (VSM) has been presented in the paper. Value stream mapping is one of the basic management tools in the context of Lean Management or Lean Production. It allows to visualize the flow of decision, information, material and their connections in the full production cycle (from the order, through planning, production, to shipping to the customer). VSM is a lean tool that gives the ability to create flows in the process before implementing changes. In this paper, the possibilities of changes planning based on the current and future status maps have been discussed. On the basis of the current state map (CSM), the areas requiring improvement and operations which efficiency is decisive and for the process have been designated. Particular attention has been paid to the possibilities of using VSM in unit production processes. In the paper has been proposed the two possibilities for company development in terms of the improvement technique in line with the Kaizen philosophy as well as the implementation of process innovations. Which means balanced development through the improvement of the existing process or an acute development strategy through the implementation of process innovations (which involves significant costs).