The thesis is focus on design solutions of automatic tool changer for CNC vertical milling machine SLV 300 in cooperation with the design company IMC/Engineering s. r. o. The main goal of theses is the creation of several design variants based on the critical research of similar machinery and the subsequent choice of the most appropriate solution. The assessment of the various options is done with amount of the changes caused on the existing design of the machine. It is essential the suitability of the solution from the perspective of the customer's company SolidVision s. r. o. Design solution is being designed for the possibility of a presentation device with unique features in its class, which is meant to be a simple maintenance free design with the possibility of easy service access For the chosen solution of the automatic tool changer are by calculation verified by the most exposed part of the device. In the thesis is also design documentation, for a better understand of the design solution.

In der Dissertation wurde der Stand der Technik zum Fertigungsverfahren Druckgießen mit dem Fokus auf die Druckgießwerkzeuge recherchiert und strukturiert aufbereitet. Der Stand der Technik mündet in der Systematik zur Optimierung des Druckgießens. Darin wurde die Problematik ganzheitlich aufgearbeitet, konkretisiert und wesentliche Handlungsfelder, wie das Temperierkonzept, der Werkstoff sowie die Auslegung, herausgearbeitet. Das Handlungsfeld Temperierkonzept wurde fokussiert und daraus das Konzept des mehrteiligenWerkzeuges erarbeitet. DiesesWerkzeugkonzept ermöglicht durch seinen Aufbau eine Maximierung der Wärmeübertragungsfläche, eine Reduzierung des Abstandes der Temperierung zum Gussteil und eine Erhöhung des Wärmeübergangskoeffizienten. Der mehrteilige Aufbau wurde in einem Versuchswerkzeug für das Druckgießen umgesetzt, sukzessive ausgelegt und virtuell abgesichert. Abschließend zeigte die thermische Simulation des Prozess Druckgießen ein Potential zur Reduzierung der Zykluszeit von 12,9s (14%) mit dem mehrteiligen Werkzeug auf. Im Dauerbetrieb konnte prozesssicher, reproduzierbar und dauerhaft eine Zykluszeitreduzierung um 20,5s (23%) nachgewiesen werden.

In der Dissertation wurde der Stand der Technik zum Fertigungsverfahren Druckgießen mit dem Fokus auf die Druckgießwerkzeuge recherchiert und strukturiert aufbereitet. Der Stand der Technik mündet in der Systematik zur Optimierung des Druckgießens. Darin wurde die Problematik ganzheitlich aufgearbeitet, konkretisiert und wesentliche Handlungsfelder, wie das Temperierkonzept, der Werkstoff sowie die Auslegung, herausgearbeitet. Das Handlungsfeld Temperierkonzept wurde fokussiert und daraus das Konzept des mehrteiligen Werkzeuges erarbeitet. Dieses Werkzeugkonzept ermöglicht durch seinen Aufbau eine Maximierung der Wärmeübertragungsfläche, eine Reduzierung des Abstandes der Temperierung zum Gussteil und eine Erhöhung des Wärmeübergangskoeffizienten. Der mehrteilige Aufbau wurde in einem Versuchswerkzeug für das Druckgießen umgesetzt, sukzessive ausgelegt und virtuell abgesichert. Abschließend zeigte die thermische Simulation des Prozess Druckgießen ein Potential zur Reduzierung der Zykluszeit von 12,9s (14%) mit dem mehrteiligen Werkzeug auf. Im Dauerbetrieb konnte prozesssicher, reproduzierbar und dauerhaft eine Zykluszeitreduzierung um 20,5s (23%) nachgewiesen werden.

Heat generated in a machining process is a common and critical obstacle faced in today's machining industries. The heat generated in the cutting zone has a direct negative influence on the tool life which, in turn contributes to increase the manufacturing costs. Especially, in machining of Heat Resistant Super Alloys, HRSA this is a very limiting factor. HRSA are capable of retaining their mechanical strength and hardness at elevated temperatures. This property is advantageous in the application in e.g. aero-engines but also a disadvantage, since it also lowers the machinability significantly. This work is an attempt to improve the heat transfer from the cutting zone, which would lead to an increase in the tool life. To achieve this goal, the cutting tool has been modified to create an improved interface between the coolant and tool in the high-temperature areas. Two generations of inserts have been designed and investigated. Firstly, an insert with surface texture features has been created with the purpose of increasing the available surface area for heat dissipation: First generation, Gen I. Secondly, a GenII was designed as a further improvement of Gen I. Here, several channel features on the rake face were added, reaching out from the contact zone to the near proximity of the cutting edge. This with the purpose of improving access of the coolant closer to the cutting edge. The experiments were conducted in facing operations of Alloy 718 with uncoated round carbide inserts. All experiments were carried out with high-pressure coolant assistance, with a pressure of 16 MPa on the rake face and 8 MPa on the flankface, respectively.The two generations of inserts, Gen I and Gen II, were experimentally evaluated by tool wear analysis in comparison with a regular insert. The results shows that the tool life increased significantly for the Gen I insert, compared to a catastrophic failure of the regular insert at the same conditions. Regarding the Gen II insert,an increase in tool life by approximately 30 to 40 percent compared to Gen I insert was observed.

RTFC is a multichannel publishing tool which has been designed to convert text documents into several accessible formats. You can produce books in common file formats like plain text, HTML and HTML Help as well as large print, Braille, web Braille and DAISY. It implements a standard for e-books which was created at German schools for the blind. This standard makes it possible to get the most out of DAISY even though desktop publishing software often has no capabilities to mark up optional content like annotations or sidebars. Therefore RTFC is especially suitable to convert school books and other non-fiction literature.

In a stroke-certified 500-bed acute care hospital, the 30-day readmission rates for patients discharged to rehabilitation centers or skilled nursing facilities were higher than the rates for patients discharged to home. A review of data by the stroke team showed 44 patients readmitted within 30 days of initial stroke discharge between October 2016 and January 2017. The rate of re-admission for those discharged home was 41% (18 patients), whereas the rate for those discharged to acute inpatient rehabilitation, long-term acute care, or skilled nursing facilities was 59% (26 patients). The practice-focused question for this project assessed whether using a re-admission risk-assessment tool and implementing interventions during the initial acute-care admission, would help to identify and improve risk for 30-day re-admissions for patients diagnosed with stroke. The goal of this research project was to adopt, test, and recommend the implementation of a readmission risk assessment tool to enable discharge planners to identify stroke patients at risk for readmission and implement interventions to help reduce this risk. Lewin’s theory of change was used to inform the project. A stroke re-admission risk-assessment tool in use at a similar hospital was adopted and tested for 1 week on the hospital’s 28-bed stroke unit by nurse case managers. The test was conducted among 5 patients with confirmed diagnosis of stroke. A re-admission data review was performed 30 days after their discharge, which showed no readmissions for the 5 patients involved in the trial. The tool helped to improve case manager awareness of increased risk for readmissions, guide interventions, and improve patient transition and outcomes. The implications of this project for positive change include the potential to improve risk for patients with stroke in the acute-care facility.

Både digitala och analoga skrivverktyg utgör en stor del av den tidiga skrivundervisningen. Det råder dock skilda åsikter om vilket skrivverktyg som är mest gynnsamt för elevernas textskapande. Syftet med denna studie är att bidra med kunskaper om elever och lärares uppfattningar om betydelsen av digitala respektive analoga skrivverktyg för textskapande. För att besvara syftet ligger följande frågeställningar till grund: Vilka möjligheter och utmaningar vid textskapande upplever elever med digitala respektive analoga skrivverktyg? Vilka möjligheter och utmaningar vid textskapande upplever lärare med digitala respektive analoga skrivverktyg? Samt vilka skillnader och likheter mellan lärarnas och elevernas uppfattningar förekommer? I studien har en kvalitativ metod använts i form av semistrukturerade intervjuer. Totalt deltar två lärare och åtta elever från två skolor i årskurs 3. Lärarintervjuerna har genomförts enskilt och elevintervjuerna i grupp. Studien har sin utgångspunkt i det sociokulturella perspektivet. Resultatet i studien visar att lärare och elevers uppfattningar till stor del stämmer överens. De möjligheter som resultatet visar är att digitala skrivverktyg underlättar textredigeringen samt att eleverna skriver snabbare och längre texter. Även olika funktioner skapar möjlighet för eleverna att bli medveten om sin stavning. Samtidigt kan funktionerna vara en utmaning eftersom det kan hämma elevernas lärande. Med analoga skrivverktyg gynnas elevernas motorik och minnesförmåga men kan vara utmanande då eleverna upplever att det värker i handen när de skriver för hand. Studiens slutsats är att det krävs medvetna didaktiska val av läraren för att avgöra när respektive skrivverktyg ska användas. / Both digital and analog writing tools are a big part of the early writing development. However, there are different opinions about which writing tool is the most beneficial for students’ text creation. Thus, the purpose of this study is to contribute knowledge about students’ and teachers’ perception of the importance of digital and analogue writing tools for text creation. To answer this, the following questions are the base of this essay: What opportunities and challenges in text creation do students experience with digital and analog writing tools? What opportunities and challenges in text creation do teachers experience with digital and analog writing tools? And what differences and similarities exist between the teachers' and students' perceptions? In the study, a qualitative method has been used in the form of semi-structured interviews. A total of two teachers and eight year 3 students from two schools participate. The teacher interviews were conducted individually and the student interviews in groups. The study has its theoretical anchoring in the socio-cultural perspective. The results of the study show that teachers' and students' perceptions largely agree. The results show that digital writing tools facilitate text editing and that students write faster and longer text. Certain functions also create opportunities for students to become aware of their spelling. At the same time, the features can be a challenge as it can hinder students' learning. With analog writing tools, the students' motor skills and memory are benefited, but can be challenging as the students find their hand aching when writing by hand. The study concludes that the teachers´ didactic choices are vital when determining which writing tool to use in the classroom.

Accuracy and efficiency are extremely critical factors for large real-time control applications. A small oversight can cause catastrophic failure of a real-time system. Thus, these applications have to be tested meticulously to prevent any catastrophe that might occur. But, testing these applications exhaustively is not tractable, mainly due to the inherent complexity of the applications and also the huge amount of inputs and outputs that these applications involve. In order to save valuable amounts of time and resources, automated testing is imperative. Also, quantitative metrics have to be provided that assess the existing quality of the system and help increase the confidence in the user towards the software. However, to improve the overall quality of the software, additional focused testing needs to be done. The work in this thesis involves providing specific test suggestions that help the user conduct thorough and precise domain tests based on the knowledge of the various parameters used in previous test runs. The information about the defective portions of the input domain is provided by dividing the input range into percentiles, which is referred to here as bucketing. The goal is to expose the exact inputs causing the defects and the range of inputs that have been lightly tested or left untested during previous tests. A Reliability Analysis Test Tool (RATT) was developed to implement these test suggestions.

For some time now coordinate measuring machines have been an integral part of the shop floor. The goal has been to make coordinate measuring machines (CMMs) into tools that can easily be used by machinists to improve their manufacturing capabilities. The value of a CMM as a quality control tool is undisputed. Now efforts are being made to further reduce the time and cost of measurement by reducing the physical distance between machining and measuring processes. The ability to reduce that distance to zero and measure a part directly on the chip-making machine has been a goal for many years. Dimensional inspection of parts is primarily conducted by coordinate measuring machines operating on motion instructions from task planning software. The research in direct machining and control (DMAC) at BYU has identified a potential application of CMM technologies on existing machine tools. To prove that a machine tool can be controlled as a CMM with the DMAC controller, this research will integrate the software package PC-DMIS provided by Wilcox Associates, Inc. with a DMAC controller provided by Direct Controls, Inc. to conduct in-process dimensional inspection of parts as they are being machined. This process is referred to as DirectCMM because it will link the DMAC controller directly to PC-DMIS without need for post-processing. This thesis will lay the groundwork for future efforts at developing systems that utilize in-process part inspection to dynamically correct computer aided manufacturing (CAM) process plans. To aid future efforts at dynamic CAM process updating, a software interface specification will be created for passing measurement data between CMM and CAD/CAM software packages. A CMM control specification will also be created to provide a standard method for controlling coordinate measuring machines with the DMAC controller. Possible methods for dynamic CAD/CAM updating will be explored.

This thesis develops an algorithm to decrease high-curvature sections in tool paths for complex parts to achieve shorter machining times resulting in higher production rates. In the research sample cases, the algorithm decreased machining times by 1% to 9% for design-induced sections of high curvature and by 16% to 75% for CAM induced ripples using high path tolerances. High-curvature sections in tool paths are caused by complex part geometry, noise, and discontinuities in the model. The curvature is decreased by deviating the tool path within an allowable path tolerance. The feedrate along the tool path is directly related to the curvature of the tool path. High-curvature sections cause the NC machine to reduce the feedrate along the tool path due to acceleration and jerk limits. These lower feedrates increase machining time and slow production rates. This new algorithm decreases curvature, which increases feedrates and decreases machining times, thereby increasing production rates for manufacturing companies. The tool paths are represented by cubic B-splines. The algorithm is based on the basic principle that the curvature of a B-spline directly relates to the geometry of its control polygon. If the control polygon's geometry has many tight corners then the B-spline will have high curvature. If the control polygon's geometry is a straight line then the B-spline will be a straight line with zero curvature. The algorithm deviates the control polygon's points so that they move towards forming a straight line. The control polygon will rarely form a straight line because the spline is limited by the path tolerance. However, as the control polygon moves towards forming a straight line, the curvature decreases, which allows the feedrate to increase. Six sample cases are explored in which the machining time is decreased. Three of the cases are tool paths that contain curvature sections with a range of unnecessary curvature from low to high. One sample is the tool path for the complex geometry in a snow tire mold. Another sample tool path contains ripples caused by noise in the CAD model. The last tool path contains ripples caused by tangency discontinuities in the CAD model. The percent of time saved directly relates to the severity of the curvature in the part. This thesis provides a quick and efficient means to reduce curvature in complex parts, resulting in decreased machining times and increased production rates.