Old-Fashioned Pep Rallies to Spotlight Football, Soccer; UD Grad, Bar Code Inventor Returns to Alma Mater; JFK Statue Comes Home in Time for Homecoming; 300 Runners Expected for Homecoming 5k Race

News release announces that two pep rallies will be held during Homecoming Weekend; Paul McEnroe will talk about his work to develop the bar code; The restored JFK statue will be unveiled; The annual Thomas J. Frericks 5K run/walk will be held

Evaluation of the Human Error Probability in Cellular Manufacturing

Referring to Gutenberg there are three elementary production factors: material, equipment and human workforce. They all have a significant influence on the product quality. Nevertheless, in machining research they have been given differing attention, depending on the focused scope. This paper presents the results of an empirical study of the human error probability (HEP) in a Cellular Manufacturing environment. First, it is shown that the influence of human work on the resulting product quality in machining so far has only been given little attention. Therefore a content analysis according to Mayring has been conducted on publications in the domains of production technology and ergonomics. Second, various schemes for the classification of human errors are presented and evaluated in terms of their applicability to human tasks in machining. Finally the design and results of an empirical study which has been conducted at the Cellular Manufacturing reference line, consisting of two lathes and four milling machines, in the Center for industrial Productivity (CiP) at TU Darmstadt are presented. Overall 2700 human-machine interactions have been observed and evaluated in terms of their influence on product quality. Results show that there is a significant influence of the human worker as three percent of these interactions incorporated a spurious action

Umweltfragen in der Bielefelder Industriegeschichte

Radkau J. Umweltfragen in der Bielefelder Industriegeschichte. In: Böllhoff F, Boström J, Hey B, eds. Industriearchitektur in Bielefeld – Geschichte und Fotografie. Bielefeld; 1986: 88-97

Volume and Mix Flexibility Evaluation of Lean Production Systems

This paper introduces a practice-oriented and field-tested approach to measure and evaluate volume and mix flexibility of a lean production system. After an introductory literature review revealing and classifying various types of flexibility as well as models to determine the flexibility of production systems, the most important flexibility types volume and mix flexibility are identified. Existing approaches for volume and mix flexibility evaluation are hard to implement in practice for different reasons: They are often bound to specific constraints or require extensive and complex input parameters. Additionally a lot of these models neglect the actual demand for flexibility. Lean production systems strive for a reduction of throughput times by eliminating non-value-adding work. In a perfectly lean and flexible production system responding to volatile demands, time gaps between customer demand dates and production dates would be removed completely for every single order. The model designed therefore uses the capacity-weighted difference of demand and corresponding production in a restricted time period for each product variant in relation to the total capacity demand

Volume and Mix Flexibility Evaluation of Lean Production Systems

AbstractThis paper introduces a practice-oriented and field-tested approach to measure and evaluate volume and mix flexibility of a lean production system. After an introductory literature review revealing and classifying various types of flexibility as well as models to determine the flexibility of production systems, the most important flexibility types – volume and mix flexibility – are identified. Existing approaches for volume and mix flexibility evaluation are hard to implement in practice for different reasons: They are often bound to specific constraints or require extensive and complex input parameters. Additionally a lot of these models neglect the actual demand for flexibility.Lean production systems strive for a reduction of throughput times by eliminating non-value-adding work. In a perfectly lean and flexible production system responding to volatile demands, time gaps between customer demand dates and production dates would be removed completely for every single order. The model designed therefore uses the capacity-weighted difference of demand and corresponding production in a restricted time period for each product variant in relation to the total capacity demand

Evaluation of Work Measurement Concepts for a Cellular Manufacturing Reference Line to Enable Low Cost Automation for Lean Machining

AbstractCellular Manufacturing has been proven to be an economic, efficient and lean approach bringing flexibility into machining areas. Corresponding solutions use several basic machines that are adapted to the machining task in a right-sized equipment approach. However, the use of basic, low cost machinery providing just necessary functions results in a relatively high manual operation effort. The preferred approach in order to reduce manual work in production is automation. Traditional automation of man-machine systems – especially in western countries – tends to be comprehensive and thus often complex and expensive. A low cost, lean automation intelligently being adapted to the individual task, as well as a decision method for choosing the tasks worth being automated, is required.The first step on the road towards a scientifically sound low cost automation method for a Cellular Manufacturing line is identifying and quantifying the different manual tasks which could potentially be automated. Therefore, this paper starts with investigating existing analytical methods for measuring work. The different measuring concepts have been applied to the Cellular Manufacturing reference line at the Process Learning Factory CiP at TU Darmstadt. An adequate evaluation system considering reality, detail, variation and effort levels has been defined in order to assess the results’ suitability for evaluating manual work in a Cellular Manufacturing line, pointing out potentials and limits of the individual approaches. As the final outcome, a ranking of different work measurement concepts for the Cellular Manufacturing reference line is presented, verifying the applicability of the general approach and serving as a basis for further evaluation of other lines

Qualität in der Sequenzfertigung* Bewertung und Diskussion der Prozessfähigkeit einer schlanken Zerspanungszelle

In der Zerspanung kann das häufige Umspannen eines Bauteils, wie es die Sequenzfertigung erfordert, eine signifikante Herausforderung für die Maßhaltigkeit eines Fertigungsergebnisses sein. Nach einer kurzen Erläuterung des Konzepts der Sequenzfertigung stellt der Fachartikel die Ergebnisse der Prozessfähigkeitsbewertung einer Sequenzfertigungslinie dar, auf welcher der Boden eines Pneumatikzylinders gefertigt wird. Es wird gezeigt, dass dieses Konzept auch qualitätsperspektiv interessante Einsatzgebiete besitzt. Quality in cellular manufacturing - Evaluation and discussion of the process capability in a lean machining cell In machining, a high amount of clamping operations, as they are required when applying the concept of cellular manufacturing, may have a negative impact on the part quality. After a short introduc - tion to cellular manufacturing this paper presents the results of a process capability study in a cellular manufacturing area where the bottom of a pneumatic cylinder is produced. It is shown that there are interesting fields of application for this concept, also from a quality point of view