The thesis is focused on the proposal design of the technology of the production of the cover plate of the lock, which together with other parts forms part of the fifth door of the passenger car. The cover is made of 2 mm metal sheet and includes a number of bends, embosses, cuts and trimmed holes. Based on production requirements and a series size of 1,200,000 pieces over 3 years, the production using a progressive composite tool was chosen. The part will be made in eleven steps composing of cutting, stamping, bending and edging. Micro-alloyed structural steel S355MC was chosen as the most suitable material. The part will be produced on the press KSTU 5000-30-7G RKM from the company ANDRITZ Metals and the price of the product is 14,33 CZK.

This master´s thesis focuses on the concept of manufacturing of carbon brush holder, made of steel S235JRG (ČSN 11 343), with thickness of 1,5 mm. In order to reduce costs, it was decided to manufacture the holder with progresive stamping tool, which combines cutting, bending and edging operations in order to achieve specific part shape. Based on relevant calculations the mechanical press LEN 63 C was chosen. The production series was set at 50 000 pieces.

The in the framework of Master’s Studies developed project presents a technology- proposal for the production of a pressing tool for the manufacturing of parts from the sheet steel DD13. On the basis of a literary survey of problems of the component manufacturing through shearing, bending and the studies of heat treatment and applications of covering coat and calculation, manufacturing in the phase-shearing tool was proposed. The press GERB EDELHOFF 80 t was selected as the working device.

KVAPIL Jan: Bending and cutting press machine for representativ part The Master´s thesis, which is developer in an undergraduate degrese in M-VSR, provides a brief overview and description of the cutting and bending technology. The thesis is carried out the calculation, which is essential for the design cutting and bending tools. Models and design are created in the software SolidWorks 2012. The Master´s thesis includes a general procedure after the award until after copy the parts on it.

The diploma thesis deal with the proposal of connector manufacturing from bronze sheet CuSn6, thickness 1.5mm in production volume of 1.600.000 parts per year. From considered manufacturing variants there was chosen shearing and forming technology of thread in the progressive stamping die. For part production was selected pressing machine Bruderer 1250 with nominal pressing force 1250 kN from company E. Bruderer Maschinenfabrik AG. In the economical evaluation there were determined expenses 21.6 Kč per one piece including demanded profit. The turning point was calculated at production of 165.522 parts.

The aim is to design a single purpose machine for drilling and slotting plastic molding and then pressing the internal mechanics. First is described the current product technology, according to which the defined parameters of the basic units of the machine. Then described two possible design concepts devices whose suitability is then evaluated multi-criteria method.

Los virus de RNA de cadena positiva conforman el grupo más numeroso y diverso de los patógenos virales de las plantas. Se replican mediante un mecanismo en el que la RNA polimerasa RNA dependiente viral, junto con otras proteínas virales y del huésped, sintetizan un intermediario de polaridad complementaria (o negativa), que a la vez sirve de molde para la síntesis del RNA genómico de polaridad positiva. Este mecanismo puede seguir un modelo geométrico o de stamping machine (Sardanyés et al. 2009). Por otro lado, las rutas de silenciamiento de RNA en plantas desempeñan un papel muy importante en la regulación de los procesos de desarrollo, mantenimiento de la estructura cromosómica y mecanismos de defensa contra virus patógenos (Matzke y Matzke, 2004). Los microRNA (miRNAs) son una clase de pequeños RNAs (sRNAs) endógenos que se producen en el núcleo a partir de transcritos precursores (pre-miRNA) en forma de horquilla, por la acción, en plantas, de Dicer 1 (DCL1). Los miRNAs maduros (21 nt) son cargados por RISC y dirigen la degradación de mRNAs endógenos que contienen una secuencia diana complementaria, regulando así su concentración. Para oponerse al silenciamiento de RNA antiviral, en la mayoría de virus de plantas y algunos virus animales han evolucionado proteínas supresoras del silenciamiento que interfieren en pasos clave de la ruta de los pequeños RNAs interferentes (siRNA): directamente secuestrando los siRNAs, inhibiendo su producción o previniendo su diseminación por el huésped a corta o larga distancia (Li y Ding, 2006). Recientemente se ha desarrollado una nueva estrategia para producir plantas resistentes a virus basada en las rutas de silenciamiento de RNA. Consiste en expresar en plantas transgénicas miRNAs artificiales (amiRNAs) dirigidos contra secuencias específicas de los virus sobre los que se desea resistencia (Niu et al., 2006). Plantas de Arabidopsis thaliana transgénicas que expresan amiRNAs en los que se ha sustituido en el pre-amiRNA la secuencia de 21 nt del miR159 maduro, por diferentes secuencias complementarias a distintas regiones del genoma de un potyvirus (Riechmann et al., 1992. Urcuqui-Inchima et al., 2001) como el virus del mosaico del nabo (TuMV) han resultado ser resistentes a este virus en ensayos de laboratorio (Niu et al., 2006). El estudio de los aspectos moleculares de la resistencia mediada por microRNAs artificiales durante la complejidad de la infección viral puede permitir la mejora en el diseño de esta estrategia de resistencia desde el punto de vista de robustez, especificidad, durabilidad y seguridad medioambiental. Sobre todo porque los virus de RNA presentan una elevada tasa de mutación (Duffy et al., 2008) y linajes evolutivos independientes de TuMV son capaces de romper la resistencia mediada por un amiRNA, debido a la aparición de alelos mutantes que evaden el reconocimiento del miRNA artificial (Lafforgue et al., 2011). / Martínez García, F. (2014). Análisis de la dinámica de replicación de un virus de RNA de plantas y del uso de microRNAs artificiales como estrategia antiviral [Tesis doctoral]. Editorial Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/35447 / TESIS / Premios Extraordinarios de tesis doctorales

In today's car industries, low investment costs and high production rates are sought. By using nut piercing in the stamping dies in the manufacture of body components, otherwise necessary subsequent tempos can be reduced. The goal of the work was to implement nut piercing from below in a reference die to be able to use this type of operation in future projects. The main problem when implementing nut piercing from below is to be able to handle and evacuate the scrap piece that remains after the punching. By studying the equipment in the reference die, a deeper understanding of the process could be obtained, at the same time as information and necessary material were collected by expertise and the case company's suppliers for nut piercing. The recommendation to the case company provides a solution proposal for scrap evacuation as well as the components involved to be able to carry out the operation.

No description available.

Die vorliegende Arbeit untersucht den Einsatz einer induktiven Längsfelderwärmung im Wärmebehandlungsprozess der direkten Warmumformung automobiler Karosserieblechbauteile. Zur Charakterisierung des Erwärmungsvorgangs werden sowohl experimentbasierte Regressionsmodelle als auch ein FEM-Simulationsmodell entwickelt. Der Einfluss der induktiven Erwärmung auf die Ausbildung der AlSi-Beschichtung, die Widerstandspunktschweißbarkeit so-wie die Korrosionsbeständigkeit gefertigter Blechbauteile wird dargelegt. Abschließend wird ein Anlagenkonzept entwickelt, das durch den Einsatz der induktiven Längsfelderwärmung eine Verringerung der Erwärmungsdauer um etwa 50 % sowie eine Verkürzung der erforderlichen Ofenlänge um etwa 37 % ermöglicht. / The present thesis investigates the usage of longitudinal induction heating in the austenitization process of direct press hardening. In order to describe the induction heating procedure, experiment-based regression models as well as a FEM model are developed. The influence of an induction heating process on the properties of press hardened parts with aluminum-silicon coating is depicted. Therefore, resistance spot welding tests, paint adhesion tests and corrosion tests are performed. Finally, a heating concept for series production including a longitudinal induction heating is developed, which allows a decrease in heating time of about 50 % and a reduction of furnace length of about 37 %.