Vernetzte Fertigung/Connected manufacturing - Considering the manufacturing history of sheet metal components when joining by forming

Die Herstellung von Blechbauteilen umfasst mehrere Schneid- und Umformoperationen, welche die resultierenden Bauteileigenschaften beeinflussen. Daher weichen die Eigenschaften vom Ausgangszustand des Halbzeugs ab, was bei der Auslegung von Clinchverbindungen berücksichtigt werden muss. Durch die Vernetzung der Einzelverfahren auf Basis der Prozessdaten werden ein Vorgehen zur Ermittlung der Halbzeugeigenschaften beim Scherschneiden und die Auswirkungen auf die Verbindungsqualität beim Clinchen aufgezeigt.   Sheet metal components are manufactured in various cutting and forming operations influencing the resulting properties of the parts. As these properties differ from the initial state of the semi-finished products, they have to be considered in the design of clinched joints. By connecting individual processes, this paper presents an approach for determining the properties of semi-finished parts in shear-cutting operations as well as their effects on the joint quality in clinching.

Exploring Cultural Memory Through Political Economy—Manufacturing History in the Documentary The Battle for Hitler’s Supership (2005)

This article suggests supplementing Astrid Erll’s framework for analysis of memory making media with key insights from Herman and Chomsky’s propaganda model. An analysis of the documentary The Battle for Hitler’s Supership that portrays the story of the German battleship Tirpitz, which the British Royal Air Force sunk in Tromsø in 1944, will illustrate the benefits of this approach. The combination of a formal analysis with an examination of the structural conditions that predispose the medium’s appearance provide valuable insights into how and why a specific dominant message that is conveyed by the documentary emerges. I show that the political economy behind the TV production has an impact on the documentary’s content and form and argue that the evolving narrative not only depicts a story about the specific events of November 1944 but also about current national self-perceptions and self-presentations.

Decoding: A Guide to Kodak Paper Surface Characteristics

From 1880 to 2005, the Eastman Kodak Company manufactured black-and-white fiber-based gelatin silver paper in a wide variety of weights, grades, and formats. Kodak manufacturer records and sample books include details about Kodak paper surface characteristics and are an invaluable resource for understanding photographic paper materials. Using the extensive number of Kodak data books, manuals, and manufacturing records spread out in the collections of three Rochester, New York-based institutions—George Eastman Museum, University of Rochester Special Collections, and Image Permanence Institute—I created a chronological guide to Kodak photographic paper surface characteristics. This guide is not an approximate identification guide for Kodak papers but rather a resource that can be used to fill in gaps and propose questions about Kodak manufacturing history that is no longer easily accessible. The guide aims to help researchers, photography archivists and historians, conservators, collection managers, or anyone else interested in Kodak history gain access to a better understanding of photographic paper produced by Kodak from 1930 to 1955. The process for creating the guide is described in this article and may be used as a starting point for future research while also illuminating the importance of documenting and providing access to technological and material details about photographic objects.

Integrative Technology and Inspection Planning—A Case Study in Medical Industry

In most trendsetting industries like the aerospace, automotive and medical industry functionally critical parts are of highest importance. Due to strict legal requirements regarding the securing of the functionality of high-risk parts, both production costs and quality costs contribute significantly to the manufacturing costs. Thus, both types of costs have to be taken into consideration during the stage of technology planning. Due to the high variety of potential interactions between individual component properties as well as between component properties and manufacturing processes, the analysis of the influence of the manufacturing history on an efficient design of inspection processes and inspection strategies is extremely complex. Furthermore, the effects of inspection strategies and quality costs on the planning of manufacturing process sequences cannot be modeled to date. As a consequence, manufacturing and inspection processes are designed separately and thus a high cost reduction potential remains untapped. In this paper, a new approach for an integrative technology and inspection planning is presented and applied to a case study in medical industry. At first, existing approaches with regard to technology and inspection planning are reviewed. After a definition of relevant terms, the case study is introduced. Following, an approach for an integrative technology and inspection planning is presented and applied to the case study. In the presented approach, the complex causalities between technology planning, manufacturing history, and inspection planning are considered to enable a cost-effective production process and inspection sequence design.

Integrative Technology and Inspection Planning: A Case Study in Medical Industry

In most trendsetting industries like the aerospace, automotive and medical industry functionally critical parts are of highest importance. Due to strict legal requirements regarding the securing of the functionality of high-risk parts, both production costs and quality costs contribute significantly to the manufacturing costs. Thus, both types of costs have to be taken into consideration during the stage of technology planning. Due to the high variety of potential interactions between individual component properties as well as between component properties and manufacturing processes, the analysis of the influence of the manufacturing history on an efficient design of inspection processes and inspection strategies is extremely complex. Furthermore, the effects of inspection strategies and quality costs on the planning of manufacturing process sequences cannot be modeled to date. As a consequence, manufacturing and inspection processes are designed separately and thus a high cost reduction potential remains untapped. In this paper a new approach for an integrative technology and inspection planning is presented and applied to a case study in medical industry. At first, existing approaches with regard to technology and inspection planning are reviewed. After a definition of relevant terms the case study is introduced. Following, an approach for an integrative technology and inspection planning is presented and applied to the case study. In the presented approach the complex causalities between technology planning, manufacturing history and inspection planning are considered to enable a cost-effective production process and inspection sequence design.

Root Cause Analysis of the Unexpected Behaviour of a Flaked Material Under Irradiation and Transferability to the Doel 3/Tihange 2 Reactor Pressure Vessels

During the 2012 outage at Doel 3 (D3) and Tihange 2 (T2) Nuclear Power Plants (NPP), a large number of nearly-laminar indications were detected mainly in the lower and upper core shells. The D3/T2 shells are made from solid casts that were pierced and forged. Restart authorization in 2013 was accompanied by a number of “mid-term” requirements, to be completed during the first operating cycle after the restart. One of these requirements was the mechanical testing of irradiated specimens containing hydrogen flakes. These tests showed unexpected results regarding the shift in the Reference Temperature for Nil Ductility Transition (RTNDT) of the flaked material VB395 (Steam Generator shell rejected because of flakes) after irradiation. This paper presents the root cause analysis of this unexpected behaviour and its transferability (or not) to the D3/T2 Reactor Pressure Vessels (RPVs). A mechanistic and a manufacturing based approach were used, aiming at identifying the microstructural mechanisms responsible for the atypical embrittlement of VB395 and evaluating the plausibility of these mechanisms in the D3/T2 RPVs. This work was based on expert’s opinions, literature data and test results. Both flaked and unflaked samples have been investigated in irradiated and non-irradiated condition. All hydrogen-related mechanisms were excluded as root cause of the unexpected behaviour of VB395. Two possible mechanisms at the basis of the atypical embrittlement of VB395 were identified, but are still open to discussion. These mechanisms could be linked to the specific manufacturing history of the rejected VB395 shell. Since the larger than predicted shift in transition temperature after irradiation of VB395 is not linked with the hydrogen flaking and since none of the specific manufacturing history features that are possible root causes are reported for the D3/T2 RPVs, the D3/T2 shells should not show the unexpected behaviour observed in VB395.