Ces travaux de thèse portent sur le développement d'un revêtement multifonctionnel issu de la voie sol-gel pour la protection anticorrosion et anti-usure de pièces de pompes. Le matériau d'étude est un acier laminé non allié DC04, très sensible à la corrosion et de topographie irrégulière. Il a été démontré la faisabilité du développement d'un revêtement hybride architecturé nanocomposite, densifié en extrême surface et élaboré par voie sol-gel sur l'acier DC04. L'architecture est basée sur un gradient de concentration de couches hybrides non chargées et chargées de nanoparticules de zircone. La bicouche primaire, qui est non chargée et d'une épaisseur de 5 microns, est adhérente, couvrante, nivelante et présente de très bonnes propriétés anticorrosion, jusqu'à 1000 heures lors de l'immersion dans l'eau de ville à 60°C. L'introduction de nanoparticules de zircone dans le sol hybride permet d'obtenir une couche supérieure plus épaisse de l'ordre d'une dizaine de microns dont la surface a été densifiée par traitement laser. Les systèmes architecturés ont été caractérisés par une méthode innovante qui combine les tests d'usure Taber, les observations microstructurales et la spectroscopie d'impédance électrochimique. Des analyses spectroscopiques par RMN des noyaux 13C, 29Si et 27Al ont mis en évidence l'importance de contrôler les réactions de polymérisation inorganique et organique pour l'obtention de revêtements performants en anticorrosion. La modification de la structure de la matrice hybride organique- inorganique permettant l'insertion d'une plus grande quantité de cérium sans détériorer les propriétés anticorrosion du revêtement. / This thesis focuses on the development of a multifunctional sol-gel coating for corrosion and wear protection of pump parts. The studied material is a DC04 laminated carbon steel, very sensitive to corrosion and with an uneven topography. Feasibility of the development of an architectured hybrid coating, densified on the extreme surface and prepared by the sol-gel route on the DC04 steel has been demonstrated. The architecture is based on a gradient of concentration of zirconia nanoparticles imbedded in an aluminosilicated hybrid matrix. The resulting bilayered primer in the range 5-6 microns is adherent, covering, leveling and presents high-performance anticorrosion properties, up to 1000 hours when immersed in tap water at 60 ° C. The introduction of zirconia nanoparticles in the hybrid sol allows to obtain a thicker upper layer, in the range 8-10 microns, which surface has been densified by laser treatment for few nm in deep. Architectured systems were assessed by an innovative method which combines Taber wear tests, microstructural observations and analysis by electrochemical impedance spectroscopy. 13C, 29Si and 27Al NMR spectroscopies have highlighted the importance of controlling both the organic and inorganic polymerisation reactions to obtain efficient anticorrosion coatings. Moreover, these results demonstrate that the modification of the organic-inorganic hybrid matrix structure allows the introduction of a higher amount of cerium, as corrosion inhibitor, without damage for the anticorrosive properties of the coating.

The aim of this thesis is to propose and design the production of the cap. The cap is welded to the tube of roller regal and is used for closing the tube. They together make a fixed assembly. There is a bearing molded from inside the cap and shaft passes through the center of the cap. The main function of whole assembly is to rotate the tube around its own axis. The cap will made from deep - drawing steel DC04 with a thickness of 2 mm. After consideration various possible variants for the cap production, there was chosen deep drawing without reduction of thickness as the most profitable technology. The shape of the component was modified from the technology review. There is proposed a tool that will be used for production the caps. The caps will be produced within three operations: the first two operations form a central cup and the third operation makes the final shape of the cap. Drawings for the tool are created and delivered as part of this thesis. Based on the necessary force and work calculation, it was chosen eccentric press machine S 160 E from the ŠMERAL company. With the 25 000 series, the costs of production one piece are 51,65 CZK.

This thesis deals with the topic of procedural parameters influence on the properties of welded joint in zinc-coated deep-drawing steels in laser welding with wobbling. First part of the thesis serves as an overview of laser welding technology, welding of steel with protective zinc layer and weld quality testing. Second part is dedicated to a proposal, process flow and evaluation of an experiment. Seven trial lap welding joints of DC04+ZE steel have been welded using different welding parameters. Specimens from these trial welds were used for metallurgical testing by macro-etch examination and for tensile strength break testing to get mechanical properties of welded joints.

The thesis handle design of part of anemostat in size of series 15000 pcs/year. Due to conus shape and dimensions of part was chosen out of quantity of manufacturing processes a technology of deep drawing without a thinnig of 1mm thick DC04 steel. The resulting solution is progressive tool which concatenate four operations of deep drawing process. The drawing tool make use of standardised components. The design contain progressive tool including drawing documentation. Hydraulic press CTH 400 with nominal force 4000 kN is used for mentioned procedure.

The thesis deals with the design of the upper part of the gas tank. Taking into account the shape and dimensions, the solution was chosen the most advantageous drawing technology without a thinning of 1 mm thick DC04 steel. The solution took account of the requirements of the contracting authority and selected the production for one operation. However, the simulation proved inappropriateness of the solution, so the procedure was modified to two operation proces. At the first stroke, a larger part of the body will be created, and in the other, a calibration of the cut-out dimensions will occur. For the first operation, the design of the tool kit, including drawing documentation for the CTH 250 press, was elaborated.

Das Ausmaß der Korrosion kann durch den Werkstoff- und Oberflächenzustand gesteuert werden. Wichtige Einflussgrößen sind die Rauheit, Kristallitgröße, Mikroverzerrung, Textur und Eigenspannungen. Am Beispiel von Kaltwalzprozessen werden Abhängigkeiten dieser Größen vom Umformgrad aufgezeigt, die in numerische Simulationen implementierbar sind und somit die Aussagefähigkeit der Berechnungen maßgeblich erhöhen können. Es wird in der vorliegenden Arbeit ein Modell zur qualitativen und quantitativen Erfassung der Zusammenhänge zwischen den Einflussgrößen und der Korrosionsrate vorgeschlagen. Am Beispiel eines unlegierten Stahls (DC04) kann damit die minimal mögliche Korrosionsrate in Schwefelsäure berechnet sowie ein optimierter Ablauf der Prozessroute beim Kaltwalzen abgeleitet werden, um dieses Minimum zu erreichen. Das Modell ist auf weitere Korrosionssysteme übertragbar, was am Beispiel von EN AW-1050/Schwefelsäure aufgezeigt wird. / The extent of corrosion can be controlled by the material and surface state. Important parameters are: roughness, crystallite size, microstrain, texture and residual stresses. Using the example of cold-rolling processes, the dependencies of these parameters on the plastic strain are shown that can be implemented in numerical simulations and allow increasing the information extracted from the calculations significantly. A model is proposed for determining qualitative and quantitative correlations between the corrosion-affecting parameters and the corrosion rate. Using a carbon steel (DC04), the minimal corrosion rate in sulphuric acid can be calculated and an appropriate processing route is suggested. The model can be adopted for other corrosion systems, which is shown for EN AW-1050/sulphuric acid.

The dissertation deals with a suggestion of the production of an oil pan into the car with a deep drawing. The part will be produced out of a deep drawed steel plate – class 11 305 (DC04). On the basis of a calculation and the study of the corresponding literature about the deep drawing a reverse drawing in a convention tools with a blank holder has been suggested. The part of the machine will be also an upper ejector for the fall of a sticking of a drawn part in the die. As a semi-product a blank has been chosen, which is burned out from the piece of plate with the dimension of 2500 x 12500 mm and thickness 1 mm with the help of the laser. The production quantity is 30 000 per one year. As a forming machine a universal hydraulic presser CTH 250 from the Czech company Žďas a.s. with the nominal power 2500 kN has been chosen.

Das Ausmaß der Korrosion kann durch den Werkstoff- und Oberflächenzustand gesteuert werden. Wichtige Einflussgrößen sind die Rauheit, Kristallitgröße, Mikroverzerrung, Textur und Eigenspannungen. Am Beispiel von Kaltwalzprozessen werden Abhängigkeiten dieser Größen vom Umformgrad aufgezeigt, die in numerische Simulationen implementierbar sind und somit die Aussagefähigkeit der Berechnungen maßgeblich erhöhen können. Es wird in der vorliegenden Arbeit ein Modell zur qualitativen und quantitativen Erfassung der Zusammenhänge zwischen den Einflussgrößen und der Korrosionsrate vorgeschlagen. Am Beispiel eines unlegierten Stahls (DC04) kann damit die minimal mögliche Korrosionsrate in Schwefelsäure berechnet sowie ein optimierter Ablauf der Prozessroute beim Kaltwalzen abgeleitet werden, um dieses Minimum zu erreichen. Das Modell ist auf weitere Korrosionssysteme übertragbar, was am Beispiel von EN AW-1050/Schwefelsäure aufgezeigt wird. / The extent of corrosion can be controlled by the material and surface state. Important parameters are: roughness, crystallite size, microstrain, texture and residual stresses. Using the example of cold-rolling processes, the dependencies of these parameters on the plastic strain are shown that can be implemented in numerical simulations and allow increasing the information extracted from the calculations significantly. A model is proposed for determining qualitative and quantitative correlations between the corrosion-affecting parameters and the corrosion rate. Using a carbon steel (DC04), the minimal corrosion rate in sulphuric acid can be calculated and an appropriate processing route is suggested. The model can be adopted for other corrosion systems, which is shown for EN AW-1050/sulphuric acid.